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Posted to commits@beam.apache.org by da...@apache.org on 2022/08/29 18:17:41 UTC
[beam] branch master updated: [akvelon][tour-of-beam] backend bootstraps (#22556)
This is an automated email from the ASF dual-hosted git repository.
damccorm pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/beam.git
The following commit(s) were added to refs/heads/master by this push:
new dbc6a466660 [akvelon][tour-of-beam] backend bootstraps (#22556)
dbc6a466660 is described below
commit dbc6a466660283d2227162218f258b7a82ceca20
Author: Evgeny Antyshev <ea...@gmail.com>
AuthorDate: Mon Aug 29 21:17:32 2022 +0300
[akvelon][tour-of-beam] backend bootstraps (#22556)
* init
* get_unit_content
* samples path
* iface
* nit
* datastore
* ns
* WIP
* wip
* wip
* content
* Revert "content"
This reverts commit 9f3e977a7ecd74ad8599bd5ea3076727377c15ca.
* content
* store
* nit
* licenses
* license
* license
* licenses
* samples markdown
* README
* lint
* heterogenious groups
* nits
* nodes_simplified
* nit
* nit
* nit
* ctx
* lint
* run unittests in post-commit
* Revert "run unittests in post-commit"
This reverts commit 4e58de6b57896be7542137a45bfa812f9d36eba7.
* workflow
* workflow
* secure handlers
* Update learning/tour-of-beam/backend/function.go
Co-authored-by: Danny McCormick <da...@google.com>
* Update .github/workflows/tour_of_beam_backend.yml
Co-authored-by: Danny McCormick <da...@google.com>
* review
Co-authored-by: Danny McCormick <da...@google.com>
---
.github/workflows/tour_of_beam_backend.yml | 58 ++
build.gradle.kts | 8 +
learning/tour-of-beam/backend/README.md | 56 ++
learning/tour-of-beam/backend/cmd/ci_cd/ci_cd.go | 54 ++
learning/tour-of-beam/backend/cmd/main.go | 36 ++
learning/tour-of-beam/backend/docker-compose.yml | 26 +
learning/tour-of-beam/backend/function.go | 109 ++++
learning/tour-of-beam/backend/go.mod | 28 +
learning/tour-of-beam/backend/go.sum | 688 +++++++++++++++++++++
learning/tour-of-beam/backend/internal/entity.go | 69 +++
.../backend/internal/fs_content/builders.go | 45 ++
.../backend/internal/fs_content/load.go | 210 +++++++
.../backend/internal/fs_content/load_test.go | 79 +++
.../backend/internal/fs_content/yaml.go | 81 +++
learning/tour-of-beam/backend/internal/json.go | 29 +
learning/tour-of-beam/backend/internal/sdk.go | 51 ++
learning/tour-of-beam/backend/internal/sdk_test.go | 59 ++
.../backend/internal/service/content.go | 36 ++
.../tour-of-beam/backend/internal/service/mock.go | 48 ++
.../backend/internal/storage/adapter.go | 146 +++++
.../backend/internal/storage/datastore.go | 231 +++++++
.../tour-of-beam/backend/internal/storage/iface.go | 27 +
.../backend/internal/storage/image/Dockerfile | 32 +
.../backend/internal/storage/image/index.yaml | 29 +
.../internal/storage/image/start-datastore.sh | 61 ++
.../backend/internal/storage/schema.go | 99 +++
.../backend/samples/api/get_content_tree.json | 41 ++
.../backend/samples/api/get_unit_content.json | 10 +
.../learning-content/java/content-info.yaml | 4 +
.../java/module 1/module-info.yaml | 7 +
.../java/module 1/unit-challenge/description.md | 3 +
.../java/module 1/unit-challenge/hint1.md | 3 +
.../java/module 1/unit-challenge/hint2.md | 3 +
.../java/module 1/unit-challenge/unit-info.yaml | 5 +
.../java/module 1/unit-example/unit-info.yaml | 3 +
.../java/module 2/module-info.yaml | 7 +
.../java/module 2/unit-challenge/description.md | 3 +
.../java/module 2/unit-challenge/hint1.md | 3 +
.../java/module 2/unit-challenge/hint2.md | 3 +
.../java/module 2/unit-challenge/unit-info.yaml | 5 +
.../java/module 2/unit-example/unit-info.yaml | 3 +
.../learning-content/python/content-info.yaml | 3 +
.../python/module 1/group/group-info.yaml | 7 +
.../module 1/group/unit-challenge/description.md | 3 +
.../python/module 1/group/unit-challenge/hint1.md | 3 +
.../python/module 1/group/unit-challenge/hint2.md | 3 +
.../module 1/group/unit-challenge/unit-info.yaml | 5 +
.../module 1/group/unit-example/unit-info.yaml | 3 +
.../python/module 1/intro-unit/unit-info.yaml | 3 +
.../python/module 1/module-info.yaml | 7 +
.../learning-content_empty/java/content-info.yaml | 2 +
.../python/content-info.yaml | 2 +
52 files changed, 2539 insertions(+)
diff --git a/.github/workflows/tour_of_beam_backend.yml b/.github/workflows/tour_of_beam_backend.yml
new file mode 100644
index 00000000000..2c186c710c3
--- /dev/null
+++ b/.github/workflows/tour_of_beam_backend.yml
@@ -0,0 +1,58 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements. See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership. The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied. See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+# To learn more about GitHub Actions in Apache Beam check the CI.md
+
+name: Tour of Beam Go tests
+
+on:
+ push:
+ branches: ['master', 'release-*']
+ tags: 'v*'
+ pull_request:
+ branches: ['master', 'release-*']
+ tags: 'v*'
+ paths: ['learning/tour-of-beam/backend/**']
+
+jobs:
+ checks:
+ runs-on: ubuntu-latest
+ defaults:
+ run:
+ working-directory: ./learning/tour-of-beam/backend
+ steps:
+ - uses: actions/checkout@v3
+ - uses: actions/setup-go@v3
+ with:
+ go-version: '1.16'
+ - name: Run fmt
+ run: |
+ go fmt ./...
+ git diff-index --quiet HEAD || (echo "Run go fmt before checking in changes" && exit 1)
+
+ - name: Run vet
+ run: go vet ./...
+
+ - name: Run test
+ run: go test -v ./...
+
+ - name: golangci-lint
+ uses: golangci/golangci-lint-action@v3
+ with:
+ version: v1.49.0
+ working-directory: learning/tour-of-beam/backend
+
diff --git a/build.gradle.kts b/build.gradle.kts
index 289ba326a4c..e6d36b3743c 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -108,6 +108,14 @@ tasks.rat {
"learning/katas/**/task-remote-info.yaml",
"learning/katas/**/*.txt",
+ // Tour Of Beam learning-content metadata and its samples
+ "learning/tour-of-beam/**/content-info.yaml",
+ "learning/tour-of-beam/**/module-info.yaml",
+ "learning/tour-of-beam/**/group-info.yaml",
+ "learning/tour-of-beam/**/unit-info.yaml",
+ "learning/tour-of-beam/backend/samples/**/*.md",
+
+
// test p8 file for SnowflakeIO
"sdks/java/io/snowflake/src/test/resources/invalid_test_rsa_key.p8",
"sdks/java/io/snowflake/src/test/resources/valid_encrypted_test_rsa_key.p8",
diff --git a/learning/tour-of-beam/backend/README.md b/learning/tour-of-beam/backend/README.md
new file mode 100644
index 00000000000..2be311203b2
--- /dev/null
+++ b/learning/tour-of-beam/backend/README.md
@@ -0,0 +1,56 @@
+<!--
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+-->
+
+## Tour Of Beam Backend
+
+Backend provides the learning content tree for a given SDK,
+and currently logged-in user's snippets and progress.
+Currently it supports Java, Python, and Go Beam SDK.
+
+It is comprised of several Cloud Functions, with Firerstore in Datastore mode as a storage.
+* list-sdks
+* get-content-tree?sdk=(Java|Go|Python)
+* get-unit-content?unitId=<id>
+TODO: add response schemas
+TODO: add save functions info
+TODO: add user token info
+
+### Datastore schema
+
+The storage is shared with Beam Playground backend, so that Tour Of Beam could access its entities in
+pg_examples and pg_snippets.
+
+Conceptually, the learning tree is a tree with a root node in tb_learning_path,
+having several children of tb_learning_module, and each module has its descendant nodes.
+Node is either a group or a unit.
+
+Every module or unit has SDK-wide unique ID, which is provided by a content maintainer.
+User's progress on a unit is tied to its ID, and if ID changes, the progress is lost.
+
+__Kinds__
+- tb_learning_path
+
+ key: `(SDK_JAVA|SDK_PYTHON|SDK_GO)`
+
+- tb_learning_module
+
+ key: `<SDK>_<moduleID>`
+
+ parentKey: Learning Path key SDK
+
+- tb_learning_node
+
+ key: `<SDK>_<persistentID>`
+
+ parentKey: parent module/group key
diff --git a/learning/tour-of-beam/backend/cmd/ci_cd/ci_cd.go b/learning/tour-of-beam/backend/cmd/ci_cd/ci_cd.go
new file mode 100644
index 00000000000..9e7e109fecf
--- /dev/null
+++ b/learning/tour-of-beam/backend/cmd/ci_cd/ci_cd.go
@@ -0,0 +1,54 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You under the Apache License, Version 2.0
+// (the "License"); you may not use this file except in compliance with
+// the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+ "context"
+ "log"
+ "os"
+
+ "beam.apache.org/learning/tour-of-beam/backend/internal/fs_content"
+ "beam.apache.org/learning/tour-of-beam/backend/internal/storage"
+ "cloud.google.com/go/datastore"
+)
+
+var (
+ repo storage.Iface
+ ctx context.Context
+)
+
+func init() {
+ ctx = context.Background()
+ client, err := datastore.NewClient(ctx, "")
+ if err != nil {
+ log.Fatalf("new datastore client: %v", err)
+ }
+ repo = &storage.DatastoreDb{Client: client}
+}
+
+func main() {
+ learningRoot := os.Getenv("TOB_LEARNING_ROOT")
+ log.Printf("Parsing learning-content at %q\n", learningRoot)
+ trees, err := fs_content.CollectLearningTree(learningRoot)
+ if err != nil {
+ log.Fatal(err)
+ }
+
+ log.Printf("collected %v sdks\n", len(trees))
+ if err = repo.SaveContentTrees(ctx, trees); err != nil {
+ log.Fatal(err)
+ }
+}
diff --git a/learning/tour-of-beam/backend/cmd/main.go b/learning/tour-of-beam/backend/cmd/main.go
new file mode 100644
index 00000000000..b2b742534c6
--- /dev/null
+++ b/learning/tour-of-beam/backend/cmd/main.go
@@ -0,0 +1,36 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You under the Apache License, Version 2.0
+// (the "License"); you may not use this file except in compliance with
+// the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+ "log"
+ "os"
+
+ // Blank-import the function package so the init() runs.
+ _ "beam.apache.org/learning/tour-of-beam/backend"
+ "github.com/GoogleCloudPlatform/functions-framework-go/funcframework"
+)
+
+func main() {
+ // Use PORT environment variable, or default to 8080.
+ port := "8080"
+ if envPort := os.Getenv("PORT"); envPort != "" {
+ port = envPort
+ }
+ if err := funcframework.Start(port); err != nil {
+ log.Fatalf("funcframework.Start: %v\n", err)
+ }
+}
diff --git a/learning/tour-of-beam/backend/docker-compose.yml b/learning/tour-of-beam/backend/docker-compose.yml
new file mode 100644
index 00000000000..b5ebcf08eaa
--- /dev/null
+++ b/learning/tour-of-beam/backend/docker-compose.yml
@@ -0,0 +1,26 @@
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements. See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+version: "3"
+
+services:
+ datastore:
+ build: internal/storage/image
+ environment:
+ - DATASTORE_PROJECT_ID=project-test
+ - DATASTORE_LISTEN_ADDRESS=0.0.0.0:8081
+ ports:
+ - "8081:8081"
+ command: --no-store-on-disk --consistency=1.0
diff --git a/learning/tour-of-beam/backend/function.go b/learning/tour-of-beam/backend/function.go
new file mode 100644
index 00000000000..be740f20f70
--- /dev/null
+++ b/learning/tour-of-beam/backend/function.go
@@ -0,0 +1,109 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements. See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership. The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied. See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+package tob
+
+import (
+ "context"
+ "encoding/json"
+ "fmt"
+ "log"
+ "net/http"
+ "os"
+
+ tob "beam.apache.org/learning/tour-of-beam/backend/internal"
+ "beam.apache.org/learning/tour-of-beam/backend/internal/service"
+ "beam.apache.org/learning/tour-of-beam/backend/internal/storage"
+ "cloud.google.com/go/datastore"
+ "github.com/GoogleCloudPlatform/functions-framework-go/functions"
+)
+
+var svc service.IContent
+
+const (
+ BAD_FORMAT = "BAD_FORMAT"
+ INTERNAL_ERROR = "INTERNAL_ERROR"
+)
+
+func init() {
+ // dependencies
+ // required:
+ // * TOB_MOCK: respond with static samples
+ // OR
+ // * DATASTORE_PROJECT_ID: cloud project id
+ // optional:
+ // * DATASTORE_EMULATOR_HOST: emulator host/port (ex. 0.0.0.0:8888)
+ if os.Getenv("TOB_MOCK") > "" {
+ svc = &service.Mock{}
+ } else {
+ client, err := datastore.NewClient(context.Background(), "")
+ if err != nil {
+ log.Fatalf("new datastore client: %v", err)
+ }
+ svc = &service.Svc{Repo: &storage.DatastoreDb{Client: client}}
+ }
+
+ // functions framework
+ functions.HTTP("sdkList", sdkList)
+ functions.HTTP("getContentTree", getContentTree)
+}
+
+func finalizeErrResponse(w http.ResponseWriter, status int, code, message string) {
+ w.WriteHeader(status)
+ resp := tob.CodeMessage{Code: code, Message: message}
+ _ = json.NewEncoder(w).Encode(resp)
+}
+
+func sdkList(w http.ResponseWriter, r *http.Request) {
+ if r.Method != "GET" {
+ w.WriteHeader(http.StatusMethodNotAllowed)
+ return
+ }
+ w.Header().Add("Content-Type", "application/json")
+ fmt.Fprint(w, `{"names": ["Java", "Python", "Go"]}`)
+}
+
+func getContentTree(w http.ResponseWriter, r *http.Request) {
+ w.Header().Add("Content-Type", "application/json")
+ if r.Method != "GET" {
+ w.WriteHeader(http.StatusMethodNotAllowed)
+ return
+ }
+
+ sdkStr := r.URL.Query().Get("sdk")
+ sdk := tob.ParseSdk(sdkStr)
+ if sdk == tob.SDK_UNDEFINED {
+ log.Printf("Bad sdk: %v", sdkStr)
+ message := fmt.Sprintf("Sdk not in: %v", tob.SdksList())
+ finalizeErrResponse(w, http.StatusBadRequest, BAD_FORMAT, message)
+ return
+ }
+
+ tree, err := svc.GetContentTree(r.Context(), sdk, nil /*TODO userId*/)
+ if err != nil {
+ log.Println("Get content tree error:", err)
+ finalizeErrResponse(w, http.StatusInternalServerError, INTERNAL_ERROR, "storage error")
+ return
+ }
+
+ err = json.NewEncoder(w).Encode(tree)
+ if err != nil {
+ log.Println("Format content tree error:", err)
+ finalizeErrResponse(w, http.StatusInternalServerError, INTERNAL_ERROR, "format content tree")
+ return
+ }
+}
diff --git a/learning/tour-of-beam/backend/go.mod b/learning/tour-of-beam/backend/go.mod
new file mode 100644
index 00000000000..6601abeee27
--- /dev/null
+++ b/learning/tour-of-beam/backend/go.mod
@@ -0,0 +1,28 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You under the Apache License, Version 2.0
+// (the "License"); you may not use this file except in compliance with
+// the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+module beam.apache.org/learning/tour-of-beam/backend
+
+go 1.16
+
+require (
+ github.com/GoogleCloudPlatform/functions-framework-go v1.5.3
+ gopkg.in/yaml.v3 v3.0.1
+)
+
+require (
+ cloud.google.com/go/datastore v1.8.0
+ github.com/stretchr/testify v1.8.0
+)
diff --git a/learning/tour-of-beam/backend/go.sum b/learning/tour-of-beam/backend/go.sum
new file mode 100644
index 00000000000..45dd6a5e190
--- /dev/null
+++ b/learning/tour-of-beam/backend/go.sum
@@ -0,0 +1,688 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
+cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
+cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
+cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
+cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
+cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
+cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
+cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
+cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc=
+cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk=
+cloud.google.com/go v0.57.0/go.mod h1:oXiQ6Rzq3RAkkY7N6t3TcE6jE+CIBBbA36lwQ1JyzZs=
+cloud.google.com/go v0.62.0/go.mod h1:jmCYTdRCQuc1PHIIJ/maLInMho30T/Y0M4hTdTShOYc=
+cloud.google.com/go v0.65.0/go.mod h1:O5N8zS7uWy9vkA9vayVHs65eM1ubvY4h553ofrNHObY=
+cloud.google.com/go v0.72.0/go.mod h1:M+5Vjvlc2wnp6tjzE102Dw08nGShTscUx2nZMufOKPI=
+cloud.google.com/go v0.74.0/go.mod h1:VV1xSbzvo+9QJOxLDaJfTjx5e+MePCpCWwvftOeQmWk=
+cloud.google.com/go v0.78.0/go.mod h1:QjdrLG0uq+YwhjoVOLsS1t7TW8fs36kLs4XO5R5ECHg=
+cloud.google.com/go v0.79.0/go.mod h1:3bzgcEeQlzbuEAYu4mrWhKqWjmpprinYgKJLgKHnbb8=
+cloud.google.com/go v0.81.0/go.mod h1:mk/AM35KwGk/Nm2YSeZbxXdrNK3KZOYHmLkOqC2V6E0=
+cloud.google.com/go v0.83.0/go.mod h1:Z7MJUsANfY0pYPdw0lbnivPx4/vhy/e2FEkSkF7vAVY=
+cloud.google.com/go v0.84.0/go.mod h1:RazrYuxIK6Kb7YrzzhPoLmCVzl7Sup4NrbKPg8KHSUM=
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diff --git a/learning/tour-of-beam/backend/internal/entity.go b/learning/tour-of-beam/backend/internal/entity.go
new file mode 100644
index 00000000000..53871530345
--- /dev/null
+++ b/learning/tour-of-beam/backend/internal/entity.go
@@ -0,0 +1,69 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You under the Apache License, Version 2.0
+// (the "License"); you may not use this file except in compliance with
+// the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package internal
+
+type Unit struct {
+ Id string `json:"unitId"`
+ Name string `json:"name"`
+
+ // optional
+ Description string `json:"description,omitempty"`
+ Hints []string `json:"hints,omitempty"`
+ TaskSnippetId string `json:"taskSnippetId,omitempty"`
+ SolutionSnippetId string `json:"solutionSnippetId,omitempty"`
+ TaskName string `json:"-"`
+ SolutionName string `json:"-"`
+
+ // optional, user-specific
+ UserSnippetId string `json:"userSnippetId,omitempty"`
+ IsCompleted string `json:"isCompleted,omitempty"`
+}
+
+type NodeType int
+
+const (
+ NODE_UNDEFINED NodeType = iota
+ NODE_UNIT
+ NODE_GROUP
+)
+
+type Group struct {
+ Name string `json:"name"`
+ Nodes []Node `json:"nodes"`
+}
+
+type Node struct {
+ Type NodeType `json:"type"`
+ Group *Group `json:"group,omitempty"`
+ Unit *Unit `json:"unit,omitempty"`
+}
+
+type Module struct {
+ Id string `json:"moduleId"`
+ Name string `json:"name"`
+ Complexity string `json:"complexity"`
+ Nodes []Node `json:"nodes"`
+}
+
+type ContentTree struct {
+ Sdk Sdk `json:"sdk"`
+ Modules []Module `json:"modules"`
+}
+
+type CodeMessage struct {
+ Code string `json:"code"`
+ Message string `json:"message,omitempty"`
+}
diff --git a/learning/tour-of-beam/backend/internal/fs_content/builders.go b/learning/tour-of-beam/backend/internal/fs_content/builders.go
new file mode 100644
index 00000000000..84895431cb0
--- /dev/null
+++ b/learning/tour-of-beam/backend/internal/fs_content/builders.go
@@ -0,0 +1,45 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You under the Apache License, Version 2.0
+// (the "License"); you may not use this file except in compliance with
+// the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package fs_content
+
+import (
+ tob "beam.apache.org/learning/tour-of-beam/backend/internal"
+)
+
+type UnitBuilder struct {
+ tob.Unit
+}
+
+func NewUnitBuilder(info learningUnitInfo) UnitBuilder {
+ return UnitBuilder{tob.Unit{
+ Id: info.Id,
+ Name: info.Name,
+ TaskName: info.TaskName,
+ SolutionName: info.SolutionName,
+ }}
+}
+
+func (b *UnitBuilder) AddDescription(d string) {
+ b.Description = d
+}
+
+func (b *UnitBuilder) AddHint(h string) {
+ b.Hints = append(b.Hints, h)
+}
+
+func (b *UnitBuilder) Build() *tob.Unit {
+ return &b.Unit
+}
diff --git a/learning/tour-of-beam/backend/internal/fs_content/load.go b/learning/tour-of-beam/backend/internal/fs_content/load.go
new file mode 100644
index 00000000000..8c9ea427104
--- /dev/null
+++ b/learning/tour-of-beam/backend/internal/fs_content/load.go
@@ -0,0 +1,210 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You under the Apache License, Version 2.0
+// (the "License"); you may not use this file except in compliance with
+// the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package fs_content
+
+import (
+ "fmt"
+ "io/fs"
+ "io/ioutil"
+ "log"
+ "os"
+ "path/filepath"
+ "regexp"
+
+ tob "beam.apache.org/learning/tour-of-beam/backend/internal"
+)
+
+const (
+ contentInfoYaml = "content-info.yaml"
+ moduleInfoYaml = "module-info.yaml"
+ groupInfoYaml = "group-info.yaml"
+ unitInfoYaml = "unit-info.yaml"
+
+ descriptionMd = "description.md"
+ hintMdRegexp = "hint[0-9]*.md"
+)
+
+type learningPathInfo struct {
+ Sdk string
+ Content []string `yaml:"content"`
+}
+
+type learningModuleInfo struct {
+ Id string
+ Name string
+ Complexity string
+ Content []string `yaml:"content"`
+}
+
+type learningGroupInfo struct {
+ Name string
+ Content []string `yaml:"content"`
+}
+
+type learningUnitInfo struct {
+ Id string
+ Name string
+ TaskName string
+ SolutionName string
+}
+
+// Watch for duplicate ids. Not thread-safe!
+type idsWatcher struct {
+ ids map[string]struct{}
+}
+
+func (w *idsWatcher) CheckId(id string) {
+ if _, exists := w.ids[id]; exists {
+ log.Fatalf("Duplicate id: %v", id)
+ }
+ w.ids[id] = struct{}{}
+}
+
+func NewIdsWatcher() idsWatcher {
+ return idsWatcher{make(map[string]struct{})}
+}
+
+func collectUnit(infopath string, ids_watcher *idsWatcher) (unit *tob.Unit, err error) {
+ info := loadLearningUnitInfo(infopath)
+ log.Printf("Found Unit %v metadata at %v\n", info.Id, infopath)
+ ids_watcher.CheckId(info.Id)
+ builder := NewUnitBuilder(info)
+
+ rootpath := filepath.Join(infopath, "..")
+ err = filepath.WalkDir(rootpath,
+ func(path string, d fs.DirEntry, err error) error {
+ switch {
+ // skip nested dirs
+ case path > rootpath && d.IsDir():
+ return filepath.SkipDir
+
+ case d.Name() == descriptionMd:
+ content, err := ioutil.ReadFile(path)
+ if err != nil {
+ return err
+ }
+ builder.AddDescription(string(content))
+
+ // Here we rely on that WalkDir entries are lexically sorted
+ case regexp.MustCompile(hintMdRegexp).MatchString(d.Name()):
+ content, err := ioutil.ReadFile(path)
+ if err != nil {
+ return err
+ }
+ builder.AddHint(string(content))
+ }
+ return nil
+ })
+
+ return builder.Build(), err
+}
+
+func collectGroup(infopath string, ids_watcher *idsWatcher) (*tob.Group, error) {
+ info := loadLearningGroupInfo(infopath)
+ log.Printf("Found Group %v metadata at %v\n", info.Name, infopath)
+ group := tob.Group{Name: info.Name}
+ for _, item := range info.Content {
+ node, err := collectNode(filepath.Join(infopath, "..", item), ids_watcher)
+ if err != nil {
+ return &group, err
+ }
+ group.Nodes = append(group.Nodes, node)
+ }
+
+ return &group, nil
+}
+
+// Collect node which is either a unit or a group.
+func collectNode(rootpath string, ids_watcher *idsWatcher) (node tob.Node, err error) {
+ files, err := os.ReadDir(rootpath)
+ if err != nil {
+ return node, err
+ }
+ for _, f := range files {
+ switch f.Name() {
+ case unitInfoYaml:
+ node.Type = tob.NODE_UNIT
+ node.Unit, err = collectUnit(filepath.Join(rootpath, unitInfoYaml), ids_watcher)
+ case groupInfoYaml:
+ node.Type = tob.NODE_GROUP
+ node.Group, err = collectGroup(filepath.Join(rootpath, groupInfoYaml), ids_watcher)
+ }
+ }
+ if node.Type == tob.NODE_UNDEFINED {
+ return node, fmt.Errorf("node undefined at %v", rootpath)
+ }
+ return node, err
+}
+
+func collectModule(infopath string, ids_watcher *idsWatcher) (tob.Module, error) {
+ info := loadLearningModuleInfo(infopath)
+ log.Printf("Found Module %v metadata at %v\n", info.Id, infopath)
+ ids_watcher.CheckId(info.Id)
+ module := tob.Module{Id: info.Id, Name: info.Name, Complexity: info.Complexity}
+ for _, item := range info.Content {
+ node, err := collectNode(filepath.Join(infopath, "..", item), ids_watcher)
+ if err != nil {
+ return tob.Module{}, err
+ }
+ module.Nodes = append(module.Nodes, node)
+ }
+
+ return module, nil
+}
+
+func collectSdk(infopath string) (tree tob.ContentTree, err error) {
+ ids_watcher := NewIdsWatcher()
+
+ info := loadLearningPathInfo(infopath)
+ tree.Sdk = tob.ParseSdk(info.Sdk)
+ if tree.Sdk == tob.SDK_UNDEFINED {
+ return tree, fmt.Errorf("unknown SDK at %v", infopath)
+ }
+ log.Printf("Found Sdk %v metadata at %v\n", info.Sdk, infopath)
+ for _, item := range info.Content {
+ mod, err := collectModule(filepath.Join(infopath, "..", item, moduleInfoYaml), &ids_watcher)
+ if err != nil {
+ return tree, err
+ }
+ tree.Modules = append(tree.Modules, mod)
+ }
+
+ return tree, nil
+}
+
+// Build a content tree for each SDK
+// Walk recursively through the learning-content dir, search for metadata files:
+// content-info.yaml, module-info.yaml, unit-info.yaml.
+func CollectLearningTree(rootpath string) (trees []tob.ContentTree, err error) {
+ err = filepath.WalkDir(rootpath, func(path string, d fs.DirEntry, err error) error {
+ // terminate walk on any error
+ if err != nil {
+ return err
+ }
+ if d.Name() == contentInfoYaml {
+ tree, err := collectSdk(path)
+ if err != nil {
+ return err
+ }
+ trees = append(trees, tree)
+ // don't walk into SDK subtree (already done by collectSdk)
+ return filepath.SkipDir
+ }
+ return nil
+ })
+
+ return trees, err
+}
diff --git a/learning/tour-of-beam/backend/internal/fs_content/load_test.go b/learning/tour-of-beam/backend/internal/fs_content/load_test.go
new file mode 100644
index 00000000000..def3e9c1cd6
--- /dev/null
+++ b/learning/tour-of-beam/backend/internal/fs_content/load_test.go
@@ -0,0 +1,79 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You under the Apache License, Version 2.0
+// (the "License"); you may not use this file except in compliance with
+// the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package fs_content
+
+import (
+ "path/filepath"
+ "testing"
+
+ tob "beam.apache.org/learning/tour-of-beam/backend/internal"
+ "github.com/stretchr/testify/assert"
+)
+
+func genUnitNode(id string) tob.Node {
+ return tob.Node{Type: tob.NODE_UNIT, Unit: &tob.Unit{
+ Id: id, Name: "Challenge Name",
+ Description: "## Challenge description\n\nbla bla bla",
+ Hints: []string{
+ "## Hint 1\n\napply yourself :)",
+ "## Hint 2\n\napply more",
+ },
+ }}
+}
+
+func TestSample(t *testing.T) {
+ trees, err := CollectLearningTree(filepath.Join("..", "..", "samples", "learning-content"))
+ assert.Nil(t, err)
+ assert.Equal(t, 2, len(trees))
+ assert.Equal(t, tob.ContentTree{
+ Sdk: tob.SDK_JAVA,
+ Modules: []tob.Module{
+ {
+ Id: "module1", Name: "Module One", Complexity: "BASIC",
+ Nodes: []tob.Node{
+ {Type: tob.NODE_UNIT, Unit: &tob.Unit{Id: "example1", Name: "Example Unit Name"}},
+ genUnitNode("challenge1"),
+ },
+ },
+ {
+ Id: "module2", Name: "Module Two", Complexity: "MEDIUM",
+ Nodes: []tob.Node{
+ {Type: tob.NODE_UNIT, Unit: &tob.Unit{Id: "example21", Name: "Example Unit Name"}},
+ genUnitNode("challenge21"),
+ },
+ },
+ },
+ }, trees[0])
+ assert.Equal(t, tob.ContentTree{
+ Sdk: tob.SDK_PYTHON,
+ Modules: []tob.Module{
+ {
+ Id: "module1", Name: "Module One", Complexity: "BASIC",
+ Nodes: []tob.Node{
+ {Type: tob.NODE_UNIT, Unit: &tob.Unit{Id: "intro-unit", Name: "Intro Unit Name"}},
+ {
+ Type: tob.NODE_GROUP, Group: &tob.Group{
+ Name: "The Group", Nodes: []tob.Node{
+ {Type: tob.NODE_UNIT, Unit: &tob.Unit{Id: "example1", Name: "Example Unit Name"}},
+ genUnitNode("challenge1"),
+ },
+ },
+ },
+ },
+ },
+ },
+ }, trees[1])
+}
diff --git a/learning/tour-of-beam/backend/internal/fs_content/yaml.go b/learning/tour-of-beam/backend/internal/fs_content/yaml.go
new file mode 100644
index 00000000000..0546637a0d5
--- /dev/null
+++ b/learning/tour-of-beam/backend/internal/fs_content/yaml.go
@@ -0,0 +1,81 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You under the Apache License, Version 2.0
+// (the "License"); you may not use this file except in compliance with
+// the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package fs_content
+
+import (
+ "io/ioutil"
+ "log"
+
+ "gopkg.in/yaml.v3"
+)
+
+// Could have done it in generics if 1.18 was supported in GCF
+// Fatals on error.
+func loadLearningPathInfo(path string) (info learningPathInfo) {
+ buf, err := ioutil.ReadFile(path)
+ if err != nil {
+ log.Fatal(err)
+ }
+
+ err = yaml.Unmarshal(buf, &info)
+ if err != nil {
+ log.Fatal(err)
+ }
+
+ return info
+}
+
+func loadLearningModuleInfo(path string) (info learningModuleInfo) {
+ buf, err := ioutil.ReadFile(path)
+ if err != nil {
+ log.Fatal(err)
+ }
+
+ err = yaml.Unmarshal(buf, &info)
+ if err != nil {
+ log.Fatal(err)
+ }
+
+ return info
+}
+
+func loadLearningGroupInfo(path string) (info learningGroupInfo) {
+ buf, err := ioutil.ReadFile(path)
+ if err != nil {
+ log.Fatal(err)
+ }
+
+ err = yaml.Unmarshal(buf, &info)
+ if err != nil {
+ log.Fatal(err)
+ }
+
+ return info
+}
+
+func loadLearningUnitInfo(path string) (info learningUnitInfo) {
+ buf, err := ioutil.ReadFile(path)
+ if err != nil {
+ log.Fatal(err)
+ }
+
+ err = yaml.Unmarshal(buf, &info)
+ if err != nil {
+ log.Fatal(err)
+ }
+
+ return info
+}
diff --git a/learning/tour-of-beam/backend/internal/json.go b/learning/tour-of-beam/backend/internal/json.go
new file mode 100644
index 00000000000..793f04b213c
--- /dev/null
+++ b/learning/tour-of-beam/backend/internal/json.go
@@ -0,0 +1,29 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You under the Apache License, Version 2.0
+// (the "License"); you may not use this file except in compliance with
+// the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package internal
+
+func (nt NodeType) MarshalText() ([]byte, error) {
+ var typ string
+ switch nt {
+ case NODE_UNIT:
+ typ = "unit"
+ case NODE_GROUP:
+ typ = "group"
+ default:
+ panic("NodeType not defined")
+ }
+ return []byte(typ), nil
+}
diff --git a/learning/tour-of-beam/backend/internal/sdk.go b/learning/tour-of-beam/backend/internal/sdk.go
new file mode 100644
index 00000000000..a1451d18375
--- /dev/null
+++ b/learning/tour-of-beam/backend/internal/sdk.go
@@ -0,0 +1,51 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You under the Apache License, Version 2.0
+// (the "License"); you may not use this file except in compliance with
+// the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package internal
+
+type Sdk string
+
+const (
+ SDK_UNDEFINED Sdk = ""
+ SDK_GO Sdk = "Go"
+ SDK_PYTHON Sdk = "Python"
+ SDK_JAVA Sdk = "Java"
+ SDK_SCIO Sdk = "SCIO"
+)
+
+func (s Sdk) String() string {
+ return string(s)
+}
+
+// Parse sdk from string names, f.e. "Java" -> Sdk.GO_JAVA
+// Returns SDK_UNDEFINED on error.
+func ParseSdk(s string) Sdk {
+ switch s {
+ case "Go":
+ return SDK_GO
+ case "Python":
+ return SDK_PYTHON
+ case "Java":
+ return SDK_JAVA
+ case "SCIO":
+ return SDK_SCIO
+ default:
+ return SDK_UNDEFINED
+ }
+}
+
+func SdksList() [4]string {
+ return [4]string{"Java", "Python", "Go", "SCIO"}
+}
diff --git a/learning/tour-of-beam/backend/internal/sdk_test.go b/learning/tour-of-beam/backend/internal/sdk_test.go
new file mode 100644
index 00000000000..562679952c1
--- /dev/null
+++ b/learning/tour-of-beam/backend/internal/sdk_test.go
@@ -0,0 +1,59 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You under the Apache License, Version 2.0
+// (the "License"); you may not use this file except in compliance with
+// the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package internal
+
+import "testing"
+
+func TestParse(t *testing.T) {
+ for _, s := range []struct {
+ str string
+ expected Sdk
+ }{
+ {"Go", SDK_GO},
+ {"Python", SDK_PYTHON},
+ {"Java", SDK_JAVA},
+ {"SCIO", SDK_SCIO},
+ {"Bad", SDK_UNDEFINED},
+ {"", SDK_UNDEFINED},
+ } {
+ if parsed := ParseSdk(s.str); parsed != s.expected {
+ t.Errorf("Failed to parse %v: got %v (expected %v)", s.str, parsed, s.expected)
+ }
+ }
+}
+
+func TestSerialize(t *testing.T) {
+ for _, s := range []struct {
+ expected string
+ sdk Sdk
+ }{
+ {"Go", SDK_GO},
+ {"Python", SDK_PYTHON},
+ {"Java", SDK_JAVA},
+ {"SCIO", SDK_SCIO},
+ {"", SDK_UNDEFINED},
+ } {
+ if txt := s.sdk.String(); txt != s.expected {
+ t.Errorf("Failed to serialize %v to string: got %v (expected %v)", s.sdk, txt, s.expected)
+ }
+ }
+}
+
+func TestSdkList(t *testing.T) {
+ if SdksList() != [4]string{"Java", "Python", "Go", "SCIO"} {
+ t.Error("Sdk list mismatch: ", SdksList())
+ }
+}
diff --git a/learning/tour-of-beam/backend/internal/service/content.go b/learning/tour-of-beam/backend/internal/service/content.go
new file mode 100644
index 00000000000..90a7fe0fcd7
--- /dev/null
+++ b/learning/tour-of-beam/backend/internal/service/content.go
@@ -0,0 +1,36 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You under the Apache License, Version 2.0
+// (the "License"); you may not use this file except in compliance with
+// the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package service
+
+import (
+ "context"
+
+ tob "beam.apache.org/learning/tour-of-beam/backend/internal"
+ "beam.apache.org/learning/tour-of-beam/backend/internal/storage"
+)
+
+type IContent interface {
+ GetContentTree(ctx context.Context, sdk tob.Sdk, userId *string) (tob.ContentTree, error)
+ // GetUnitContent(ctx context.Context, unitId string, userId *string) (tob.UnitContent, error)
+}
+
+type Svc struct {
+ Repo storage.Iface
+}
+
+func (s *Svc) GetContentTree(ctx context.Context, sdk tob.Sdk, userId *string) (ct tob.ContentTree, err error) {
+ return s.Repo.GetContentTree(ctx, sdk)
+}
diff --git a/learning/tour-of-beam/backend/internal/service/mock.go b/learning/tour-of-beam/backend/internal/service/mock.go
new file mode 100644
index 00000000000..c9344a6dbec
--- /dev/null
+++ b/learning/tour-of-beam/backend/internal/service/mock.go
@@ -0,0 +1,48 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You under the Apache License, Version 2.0
+// (the "License"); you may not use this file except in compliance with
+// the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package service
+
+import (
+ "context"
+ "encoding/json"
+ "io/ioutil"
+ "path"
+ "runtime"
+
+ tob "beam.apache.org/learning/tour-of-beam/backend/internal"
+)
+
+func getSamplesPath() string {
+ _, filepath, _, _ := runtime.Caller(1)
+ return path.Join(path.Dir(filepath), "..", "..", "samples", "api")
+}
+
+type Mock struct{}
+
+// check if the interface is implemented.
+var _ IContent = &Mock{}
+
+func (d *Mock) GetContentTree(_ context.Context, sdk tob.Sdk, userId *string) (ct tob.ContentTree, err error) {
+ content, _ := ioutil.ReadFile(path.Join(getSamplesPath(), "content_tree.json"))
+ _ = json.Unmarshal(content, &ct)
+ return ct, nil
+}
+
+func (d *Mock) GetUnitContent(_ context.Context, unitId string, userId *string) (u tob.Unit) {
+ content, _ := ioutil.ReadFile(path.Join(getSamplesPath(), "unit.json"))
+ _ = json.Unmarshal(content, &u)
+ return u
+}
diff --git a/learning/tour-of-beam/backend/internal/storage/adapter.go b/learning/tour-of-beam/backend/internal/storage/adapter.go
new file mode 100644
index 00000000000..ac7a1c2b25f
--- /dev/null
+++ b/learning/tour-of-beam/backend/internal/storage/adapter.go
@@ -0,0 +1,146 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You under the Apache License, Version 2.0
+// (the "License"); you may not use this file except in compliance with
+// the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package storage
+
+import (
+ "fmt"
+
+ tob "beam.apache.org/learning/tour-of-beam/backend/internal"
+ "cloud.google.com/go/datastore"
+)
+
+func sdkToKey(sdk tob.Sdk) string {
+ switch sdk {
+ case tob.SDK_GO:
+ return "SDK_GO"
+ case tob.SDK_PYTHON:
+ return "SDK_PYTHON"
+ case tob.SDK_JAVA:
+ return "SDK_JAVA"
+ case tob.SDK_SCIO:
+ return "SDK_SCIO"
+ }
+ panic(fmt.Sprintf("Undefined key for sdk: %s", sdk))
+}
+
+func pgNameKey(kind, nameId string, parentKey *datastore.Key) (key *datastore.Key) {
+ key = datastore.NameKey(kind, nameId, parentKey)
+ key.Namespace = PgNamespace
+ return key
+}
+
+// Get entity key from sdk & entity ID
+// SDK_JAVA_{entityID}.
+func datastoreKey(kind string, sdk tob.Sdk, id string, parent *datastore.Key) *datastore.Key {
+ name := fmt.Sprintf("%s_%s", sdkToKey(sdk), id)
+ return pgNameKey(kind, name, parent)
+}
+
+func MakeUnitNode(unit *tob.Unit, order, level int) *TbLearningNode {
+ if unit == nil {
+ return nil
+ }
+ return &TbLearningNode{
+ Id: unit.Id,
+ Name: unit.Name,
+
+ Type: tob.NODE_UNIT,
+ Order: order,
+ Level: level,
+
+ Unit: &TbLearningUnit{
+ Id: unit.Id,
+ Name: unit.Name,
+
+ Description: unit.Description,
+ Hints: unit.Hints,
+ TaskSnippetId: unit.TaskSnippetId,
+ SolutionSnippetId: unit.SolutionSnippetId,
+ },
+ }
+}
+
+func MakeGroupNode(group *tob.Group, order, level int) *TbLearningNode {
+ if group == nil {
+ return nil
+ }
+ return &TbLearningNode{
+ // ID doesn't make much sense for groups,
+ // but we have to define it to include in queries
+ Id: group.Name,
+ Name: group.Name,
+
+ Type: tob.NODE_GROUP,
+ Order: order,
+ Level: level,
+
+ Group: &TbLearningGroup{
+ Name: group.Name,
+ },
+ }
+}
+
+// Depending on the projection, we either convert TbLearningUnit to a model
+// Or we use common fields Id, Name to make it.
+func FromDatastoreUnit(tbUnit *TbLearningUnit, id, name string) *tob.Unit {
+ if tbUnit == nil {
+ return &tob.Unit{Id: id, Name: name}
+ }
+ return &tob.Unit{
+ Id: tbUnit.Id,
+ Name: tbUnit.Name,
+ Description: tbUnit.Description,
+ Hints: tbUnit.Hints,
+ TaskSnippetId: tbUnit.TaskSnippetId,
+ SolutionSnippetId: tbUnit.SolutionSnippetId,
+ }
+}
+
+// Depending on the projection, we either convert TbLearningGroup to a model
+// Or we use common field Name to make it.
+func FromDatastoreGroup(tbGroup *TbLearningGroup, name string) *tob.Group {
+ if tbGroup == nil {
+ return &tob.Group{Name: name}
+ }
+ return &tob.Group{
+ Name: tbGroup.Name,
+ }
+}
+
+func FromDatastoreNode(tbNode TbLearningNode) tob.Node {
+ node := tob.Node{
+ Type: tbNode.Type,
+ }
+ switch tbNode.Type {
+ case tob.NODE_GROUP:
+ node.Group = FromDatastoreGroup(tbNode.Group, tbNode.Name)
+ case tob.NODE_UNIT:
+ node.Unit = FromDatastoreUnit(tbNode.Unit, tbNode.Id, tbNode.Name)
+ default:
+ panic("undefined node type")
+ }
+ return node
+}
+
+func MakeDatastoreModule(mod *tob.Module, order int) *TbLearningModule {
+ return &TbLearningModule{
+ Id: mod.Id,
+ Name: mod.Name,
+ Complexity: mod.Complexity,
+
+ Order: order,
+ }
+}
diff --git a/learning/tour-of-beam/backend/internal/storage/datastore.go b/learning/tour-of-beam/backend/internal/storage/datastore.go
new file mode 100644
index 00000000000..ca2f2484dff
--- /dev/null
+++ b/learning/tour-of-beam/backend/internal/storage/datastore.go
@@ -0,0 +1,231 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You under the Apache License, Version 2.0
+// (the "License"); you may not use this file except in compliance with
+// the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package storage
+
+import (
+ "context"
+ "fmt"
+ "log"
+
+ tob "beam.apache.org/learning/tour-of-beam/backend/internal"
+ "cloud.google.com/go/datastore"
+)
+
+type DatastoreDb struct {
+ Client *datastore.Client
+}
+
+// Query modules structure and content (recursively).
+func (d *DatastoreDb) collectModules(ctx context.Context, tx *datastore.Transaction,
+ rootKey *datastore.Key,
+) ([]tob.Module, error) {
+ // Custom index.yaml should be applied for this query to work
+ // (Ancestor + Order)
+ modules := make([]tob.Module, 0)
+ var tbMods []TbLearningModule
+ queryModules := datastore.NewQuery(TbLearningModuleKind).
+ Namespace(PgNamespace).
+ Ancestor(rootKey).
+ Order("order").
+ Transaction(tx)
+ _, err := d.Client.GetAll(ctx, queryModules, &tbMods)
+ if err != nil {
+ return modules, fmt.Errorf("error querying modules for %v: %w", rootKey, err)
+ }
+
+ for _, tbMod := range tbMods {
+ mod := tob.Module{Id: tbMod.Id, Name: tbMod.Name, Complexity: tbMod.Complexity}
+ mod.Nodes, err = d.collectNodes(ctx, tx, tbMod.Key, 0)
+ if err != nil {
+ return modules, err
+ }
+ modules = append(modules, mod)
+ }
+ return modules, nil
+}
+
+// Get a group recursively.
+// Params:
+// - parentKey
+// - level: depth of a node's children
+// Recursively query/collect for each subgroup key, with level = level + 1.
+func (d *DatastoreDb) collectNodes(ctx context.Context, tx *datastore.Transaction,
+ parentKey *datastore.Key, level int,
+) (nodes []tob.Node, err error) {
+ var tbNodes []TbLearningNode
+
+ // Custom index.yaml should be applied for this query to work
+ queryNodes := datastore.NewQuery(TbLearningNodeKind).
+ Namespace(PgNamespace).
+ Ancestor(parentKey).
+ FilterField("level", "=", level).
+ Project("type", "id", "name").
+ Order("order").
+ Transaction(tx)
+ if _, err = d.Client.GetAll(ctx, queryNodes, &tbNodes); err != nil {
+ return nodes, fmt.Errorf("getting children of node %v: %w", parentKey, err)
+ }
+
+ // traverse the nodes which are groups, with level=level+1
+ nodes = make([]tob.Node, 0, len(tbNodes))
+ for _, tbNode := range tbNodes {
+ node := FromDatastoreNode(tbNode)
+ if node.Type == tob.NODE_GROUP {
+ node.Group.Nodes, err = d.collectNodes(ctx, tx, tbNode.Key, level+1)
+ }
+ if err != nil {
+ return nodes, err
+ }
+ nodes = append(nodes, node)
+ }
+
+ return nodes, nil
+}
+
+// Get learning content tree for SDK.
+func (d *DatastoreDb) GetContentTree(ctx context.Context, sdk tob.Sdk) (tree tob.ContentTree, err error) {
+ var tbLP TbLearningPath
+ tree.Sdk = sdk
+
+ _, err = d.Client.RunInTransaction(ctx, func(tx *datastore.Transaction) error {
+ rootKey := pgNameKey(TbLearningPathKind, sdkToKey(sdk), nil)
+ if err := d.Client.Get(ctx, rootKey, &tbLP); err != nil {
+ return fmt.Errorf("error querying learning_path: %w", err)
+ }
+ tree.Modules, err = d.collectModules(ctx, tx, rootKey)
+ if err != nil {
+ return err
+ }
+ return nil
+ }, datastore.ReadOnly)
+
+ return tree, err
+}
+
+// Helper to clear all ToB Datastore entities related to a particular SDK
+// They have one common ancestor key in tb_learning_path.
+func (d *DatastoreDb) clearContentTree(ctx context.Context, tx *datastore.Transaction, sdk tob.Sdk) error {
+ rootKey := pgNameKey(TbLearningPathKind, sdkToKey(sdk), nil)
+ q := datastore.NewQuery("").
+ Namespace(PgNamespace).
+ Ancestor(rootKey).
+ KeysOnly().
+ Transaction(tx)
+ keys, err := d.Client.GetAll(ctx, q, nil)
+ if err != nil {
+ return err
+ }
+
+ for _, key := range keys {
+ log.Println("deleting ", key)
+ }
+
+ err = tx.DeleteMulti(keys)
+ if err != nil {
+ return err
+ }
+ return tx.Delete(rootKey)
+}
+
+// Serialize a content tree to Datastore.
+func (d *DatastoreDb) saveContentTree(tx *datastore.Transaction, tree *tob.ContentTree) error {
+ sdk := tree.Sdk
+
+ saveUnit := func(unit *tob.Unit, order, level int, parentKey *datastore.Key) error {
+ unitKey := datastoreKey(TbLearningNodeKind, tree.Sdk, unit.Id, parentKey)
+ _, err := tx.Put(unitKey, MakeUnitNode(unit, order, level))
+ if err != nil {
+ return fmt.Errorf("failed to put unit: %w", err)
+ }
+ return nil
+ }
+
+ // transaction-wide autoincremented Id
+ // could have used numericID keys, if there was no transaction:
+ // incomplete keys are resolved after Tx commit, and
+ // we need to reference them in child nodes
+ var groupId int = 0
+ genGroupKey := func(parentKey *datastore.Key) *datastore.Key {
+ groupId++
+ return datastoreKey(TbLearningNodeKind,
+ tree.Sdk, fmt.Sprintf("group%v", groupId), parentKey)
+ }
+
+ var saveNode func(tob.Node, int, int, *datastore.Key) error
+ saveGroup := func(group *tob.Group, order, level int, parentKey *datastore.Key) error {
+ groupKey := genGroupKey(parentKey)
+ if _, err := tx.Put(groupKey, MakeGroupNode(group, order, level)); err != nil {
+ return fmt.Errorf("failed to put group: %w", err)
+ }
+ for order, node := range group.Nodes {
+ if err := saveNode(node, order, level+1, groupKey); err != nil {
+ return err
+ }
+ }
+ return nil
+ }
+
+ saveNode = func(node tob.Node, order, level int, parentKey *datastore.Key) error {
+ if node.Type == tob.NODE_UNIT {
+ return saveUnit(node.Unit, order, level, parentKey)
+ } else if node.Type == tob.NODE_GROUP {
+ return saveGroup(node.Group, order, level, parentKey)
+ }
+
+ return fmt.Errorf("unknown datastore node type: %v", node.Type)
+ }
+
+ rootKey := pgNameKey(TbLearningPathKind, sdkToKey(tree.Sdk), nil)
+ tbLP := TbLearningPath{Name: tree.Sdk.String()}
+ if _, err := tx.Put(rootKey, &tbLP); err != nil {
+ return fmt.Errorf("failed to put learning_path: %w", err)
+ }
+
+ for order, mod := range tree.Modules {
+ modKey := datastoreKey(TbLearningModuleKind, sdk, mod.Id, rootKey)
+ if _, err := tx.Put(modKey, MakeDatastoreModule(&mod, order)); err != nil {
+ return fmt.Errorf("failed to put module: %w", err)
+ }
+ for order, node := range mod.Nodes {
+ if err := saveNode(node, order /*module node is at level 0*/, 0, modKey); err != nil {
+ return err
+ }
+ }
+ }
+
+ return nil
+}
+
+// Re-create content trees for each SDK in separate transaction.
+func (d *DatastoreDb) SaveContentTrees(ctx context.Context, trees []tob.ContentTree) error {
+ for _, tree := range trees {
+ log.Println("Saving sdk tree", tree.Sdk)
+ _, err := d.Client.RunInTransaction(ctx, func(tx *datastore.Transaction) error {
+ if err := d.clearContentTree(ctx, tx, tree.Sdk); err != nil {
+ return err
+ }
+ return d.saveContentTree(tx, &tree)
+ })
+ if err != nil {
+ return err
+ }
+ }
+
+ return nil
+}
+
+// check if the interface is implemented.
+var _ Iface = &DatastoreDb{}
diff --git a/learning/tour-of-beam/backend/internal/storage/iface.go b/learning/tour-of-beam/backend/internal/storage/iface.go
new file mode 100644
index 00000000000..8695adf05d4
--- /dev/null
+++ b/learning/tour-of-beam/backend/internal/storage/iface.go
@@ -0,0 +1,27 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You under the Apache License, Version 2.0
+// (the "License"); you may not use this file except in compliance with
+// the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package storage
+
+import (
+ "context"
+
+ tob "beam.apache.org/learning/tour-of-beam/backend/internal"
+)
+
+type Iface interface {
+ GetContentTree(ctx context.Context, sdk tob.Sdk) (tob.ContentTree, error)
+ SaveContentTrees(ctx context.Context, trees []tob.ContentTree) error
+}
diff --git a/learning/tour-of-beam/backend/internal/storage/image/Dockerfile b/learning/tour-of-beam/backend/internal/storage/image/Dockerfile
new file mode 100644
index 00000000000..071e7e37c92
--- /dev/null
+++ b/learning/tour-of-beam/backend/internal/storage/image/Dockerfile
@@ -0,0 +1,32 @@
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements. See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+# Version. Can change in build progress
+ARG GCLOUD_SDK_VERSION=397.0.0-emulators
+
+# Use google cloud sdk
+FROM google/cloud-sdk:$GCLOUD_SDK_VERSION
+
+# Volume to persist Datastore data
+VOLUME /opt/data
+
+# RUN mkdir -p /opt/data/WEB-INF
+COPY index.yaml /opt/data/WEB-INF/index.yaml
+COPY start-datastore.sh .
+
+EXPOSE 8081
+
+ENTRYPOINT ["./start-datastore.sh"]
diff --git a/learning/tour-of-beam/backend/internal/storage/image/index.yaml b/learning/tour-of-beam/backend/internal/storage/image/index.yaml
new file mode 100644
index 00000000000..c59bc238758
--- /dev/null
+++ b/learning/tour-of-beam/backend/internal/storage/image/index.yaml
@@ -0,0 +1,29 @@
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements. See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+indexes:
+- kind: tb_learning_module
+ ancestor: yes
+ properties:
+ - name: order
+
+- kind: tb_learning_node
+ ancestor: yes
+ properties:
+ - name: level
+ - name: order
+ - name: id
+ - name: name
+ - name: type
\ No newline at end of file
diff --git a/learning/tour-of-beam/backend/internal/storage/image/start-datastore.sh b/learning/tour-of-beam/backend/internal/storage/image/start-datastore.sh
new file mode 100755
index 00000000000..bf0ccf3f7eb
--- /dev/null
+++ b/learning/tour-of-beam/backend/internal/storage/image/start-datastore.sh
@@ -0,0 +1,61 @@
+#!/usr/bin/env bash
+
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements. See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Check user environment variable
+if [[ -z "${DATASTORE_PROJECT_ID}" ]]; then
+ echo "Missing DATASTORE_PROJECT_ID environment variable" >&2
+ exit 1
+fi
+
+if [[ -z "${DATASTORE_LISTEN_ADDRESS}" ]]; then
+ echo "Missing DATASTORE_LISTEN_ADDRESS environment variable" >&2
+ exit 1
+fi
+
+options=${options:1}
+# Check for datastore options
+while [ ! $# -eq 0 ]
+do
+ case "$1" in
+ --store-on-disk)
+ options="$options --store-on-disk"
+ shift
+ ;;
+ --no-store-on-disk)
+ options="$options --no-store-on-disk"
+ shift
+ ;;
+ --consistency=*)
+ consistency=${1#*=}
+ options="$options --consistency=$consistency"
+ shift
+ ;;
+ *)
+ echo "Invalid option: $1. Use: --store-on-disk, --no-store-on-disk, --consistency=[0.0-1.0]"
+ exit 1
+ ;;
+ esac
+done
+
+# Config gcloud project
+gcloud config set project ${DATASTORE_PROJECT_ID}
+
+# Start emulator
+gcloud beta emulators datastore start \
+ --data-dir=/opt/data \
+ --host-port=${DATASTORE_LISTEN_ADDRESS} \
+ ${options}
diff --git a/learning/tour-of-beam/backend/internal/storage/schema.go b/learning/tour-of-beam/backend/internal/storage/schema.go
new file mode 100644
index 00000000000..8550d4aed69
--- /dev/null
+++ b/learning/tour-of-beam/backend/internal/storage/schema.go
@@ -0,0 +1,99 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You under the Apache License, Version 2.0
+// (the "License"); you may not use this file except in compliance with
+// the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package storage
+
+import (
+ tob "beam.apache.org/learning/tour-of-beam/backend/internal"
+ "cloud.google.com/go/datastore"
+)
+
+// ToB Datastore schema
+// - Content tree has a root entity in tb_learning_path,
+// descendant entities in tb_learning_module/group/unit have it as a common ancestor
+// - learning path consists of modules, modules consist of groups and units
+// - Ordering is established by "order" property
+// - To limit ancestor queries by only first-level descendants, "level" property is used
+
+const (
+ PgNamespace = "Playground"
+
+ TbLearningPathKind = "tb_learning_path"
+ TbLearningModuleKind = "tb_learning_module"
+ TbLearningNodeKind = "tb_learning_node"
+
+ PgSnippetsKind = "pg_snippets"
+ PgSdksKind = "pg_sdks"
+)
+
+// tb_learning_path.
+type TbLearningPath struct {
+ Key *datastore.Key `datastore:"__key__"`
+ Name string `datastore:"name"`
+}
+
+// tb_learning_module.
+type TbLearningModule struct {
+ Key *datastore.Key `datastore:"__key__"`
+ Id string `datastore:"id"`
+ Name string `datastore:"name"`
+ Complexity string `datastore:"complexity"`
+
+ // internal, only db
+ Order int `datastore:"order"`
+}
+
+// tb_learning_node.group.
+type TbLearningGroup struct {
+ Name string `datastore:"name"`
+}
+
+// tb_learning_node.unit
+// Learning Unit content.
+type TbLearningUnit struct {
+ Id string `datastore:"id"`
+ Name string `datastore:"name"`
+ Description string `datastore:"description,noindex"`
+ Hints []string `datastore:"hints,noindex"`
+
+ TaskSnippetId string `datastore:"taskSnippetId"`
+ SolutionSnippetId string `datastore:"solutionSnippetId"`
+}
+
+// tb_learning_node
+// Container for learning tree nodes, which are either groups or units.
+type TbLearningNode struct {
+ Type tob.NodeType `datastore:"type"`
+ // common fields, duplicate same fields from the nested entities
+ // (needed to allow projection when getting the content tree)
+ Id string `datastore:"id"`
+ Name string `datastore:"name"`
+
+ // type-specific nested info
+ Unit *TbLearningUnit `datastore:"unit,noindex"`
+ Group *TbLearningGroup `datastore:"group,noindex"`
+
+ // internal datastore-only fields
+ // key: <sdk>_<id>
+ Key *datastore.Key `datastore:"__key__"`
+ Order int `datastore:"order"`
+ Level int `datastore:"level"`
+}
+
+type PgSnippets struct {
+ Key *datastore.Key `datastore:"__key__"`
+ Origin string `datastore:"origin"`
+ Sdk *datastore.Key `datastore:"sdk"`
+}
diff --git a/learning/tour-of-beam/backend/samples/api/get_content_tree.json b/learning/tour-of-beam/backend/samples/api/get_content_tree.json
new file mode 100644
index 00000000000..cf8c40b6f73
--- /dev/null
+++ b/learning/tour-of-beam/backend/samples/api/get_content_tree.json
@@ -0,0 +1,41 @@
+{
+ "modules" : [
+ {
+ "complexity" : "BASIC",
+ "moduleId" : "module1",
+ "name" : "Module One",
+ "nodes" : [
+ {
+ "type" : "unit",
+ "unit" : {
+ "name" : "Intro Unit Name",
+ "unitId" : "intro-unit"
+ }
+ },
+ {
+ "group" : {
+ "name" : "The Group",
+ "nodes" : [
+ {
+ "type" : "unit",
+ "unit" : {
+ "name" : "Example Unit Name",
+ "unitId" : "example1"
+ }
+ },
+ {
+ "type" : "unit",
+ "unit" : {
+ "name" : "Challenge Name",
+ "unitId" : "challenge1"
+ }
+ }
+ ]
+ },
+ "type" : "group"
+ }
+ ]
+ }
+ ],
+ "sdk" : "Python"
+}
\ No newline at end of file
diff --git a/learning/tour-of-beam/backend/samples/api/get_unit_content.json b/learning/tour-of-beam/backend/samples/api/get_unit_content.json
new file mode 100644
index 00000000000..a18305870ce
--- /dev/null
+++ b/learning/tour-of-beam/backend/samples/api/get_unit_content.json
@@ -0,0 +1,10 @@
+{
+ "unitId": "1.1",
+ "name": "Basic concepts",
+ "description": "Lorem ipsum...",
+ "hint": "Try to use this method....",
+ "assignment": "assignmentSnippetId",
+ "solution": "solutionSnippetId",
+ "userSnippet": "userSnippetId",
+ "completed": true
+}
diff --git a/learning/tour-of-beam/backend/samples/learning-content/java/content-info.yaml b/learning/tour-of-beam/backend/samples/learning-content/java/content-info.yaml
new file mode 100644
index 00000000000..0d6a1710531
--- /dev/null
+++ b/learning/tour-of-beam/backend/samples/learning-content/java/content-info.yaml
@@ -0,0 +1,4 @@
+sdk: Java
+content:
+ - module 1
+ - module 2
\ No newline at end of file
diff --git a/learning/tour-of-beam/backend/samples/learning-content/java/module 1/module-info.yaml b/learning/tour-of-beam/backend/samples/learning-content/java/module 1/module-info.yaml
new file mode 100644
index 00000000000..04384cb56b3
--- /dev/null
+++ b/learning/tour-of-beam/backend/samples/learning-content/java/module 1/module-info.yaml
@@ -0,0 +1,7 @@
+id: module1
+name: Module One
+complexity: BASIC
+content:
+- unit-example
+- unit-challenge
+
diff --git a/learning/tour-of-beam/backend/samples/learning-content/java/module 1/unit-challenge/description.md b/learning/tour-of-beam/backend/samples/learning-content/java/module 1/unit-challenge/description.md
new file mode 100644
index 00000000000..1906064ed20
--- /dev/null
+++ b/learning/tour-of-beam/backend/samples/learning-content/java/module 1/unit-challenge/description.md
@@ -0,0 +1,3 @@
+## Challenge description
+
+bla bla bla
\ No newline at end of file
diff --git a/learning/tour-of-beam/backend/samples/learning-content/java/module 1/unit-challenge/hint1.md b/learning/tour-of-beam/backend/samples/learning-content/java/module 1/unit-challenge/hint1.md
new file mode 100644
index 00000000000..e5d1a67fa90
--- /dev/null
+++ b/learning/tour-of-beam/backend/samples/learning-content/java/module 1/unit-challenge/hint1.md
@@ -0,0 +1,3 @@
+## Hint 1
+
+apply yourself :)
\ No newline at end of file
diff --git a/learning/tour-of-beam/backend/samples/learning-content/java/module 1/unit-challenge/hint2.md b/learning/tour-of-beam/backend/samples/learning-content/java/module 1/unit-challenge/hint2.md
new file mode 100644
index 00000000000..0c425751be9
--- /dev/null
+++ b/learning/tour-of-beam/backend/samples/learning-content/java/module 1/unit-challenge/hint2.md
@@ -0,0 +1,3 @@
+## Hint 2
+
+apply more
\ No newline at end of file
diff --git a/learning/tour-of-beam/backend/samples/learning-content/java/module 1/unit-challenge/unit-info.yaml b/learning/tour-of-beam/backend/samples/learning-content/java/module 1/unit-challenge/unit-info.yaml
new file mode 100644
index 00000000000..e20b873a3e0
--- /dev/null
+++ b/learning/tour-of-beam/backend/samples/learning-content/java/module 1/unit-challenge/unit-info.yaml
@@ -0,0 +1,5 @@
+id: challenge1
+name: Challenge Name
+complexity: BASIC
+taskName: ChallengeTask
+solutionName: ChallengeSolution
\ No newline at end of file
diff --git a/learning/tour-of-beam/backend/samples/learning-content/java/module 1/unit-example/unit-info.yaml b/learning/tour-of-beam/backend/samples/learning-content/java/module 1/unit-example/unit-info.yaml
new file mode 100644
index 00000000000..ed0c81854cb
--- /dev/null
+++ b/learning/tour-of-beam/backend/samples/learning-content/java/module 1/unit-example/unit-info.yaml
@@ -0,0 +1,3 @@
+id: example1
+name: Example Unit Name
+taskName: ExampleName
\ No newline at end of file
diff --git a/learning/tour-of-beam/backend/samples/learning-content/java/module 2/module-info.yaml b/learning/tour-of-beam/backend/samples/learning-content/java/module 2/module-info.yaml
new file mode 100644
index 00000000000..e152c45d22e
--- /dev/null
+++ b/learning/tour-of-beam/backend/samples/learning-content/java/module 2/module-info.yaml
@@ -0,0 +1,7 @@
+id: module2
+name: Module Two
+complexity: MEDIUM
+content:
+- unit-example
+- unit-challenge
+
diff --git a/learning/tour-of-beam/backend/samples/learning-content/java/module 2/unit-challenge/description.md b/learning/tour-of-beam/backend/samples/learning-content/java/module 2/unit-challenge/description.md
new file mode 100644
index 00000000000..1906064ed20
--- /dev/null
+++ b/learning/tour-of-beam/backend/samples/learning-content/java/module 2/unit-challenge/description.md
@@ -0,0 +1,3 @@
+## Challenge description
+
+bla bla bla
\ No newline at end of file
diff --git a/learning/tour-of-beam/backend/samples/learning-content/java/module 2/unit-challenge/hint1.md b/learning/tour-of-beam/backend/samples/learning-content/java/module 2/unit-challenge/hint1.md
new file mode 100644
index 00000000000..e5d1a67fa90
--- /dev/null
+++ b/learning/tour-of-beam/backend/samples/learning-content/java/module 2/unit-challenge/hint1.md
@@ -0,0 +1,3 @@
+## Hint 1
+
+apply yourself :)
\ No newline at end of file
diff --git a/learning/tour-of-beam/backend/samples/learning-content/java/module 2/unit-challenge/hint2.md b/learning/tour-of-beam/backend/samples/learning-content/java/module 2/unit-challenge/hint2.md
new file mode 100644
index 00000000000..0c425751be9
--- /dev/null
+++ b/learning/tour-of-beam/backend/samples/learning-content/java/module 2/unit-challenge/hint2.md
@@ -0,0 +1,3 @@
+## Hint 2
+
+apply more
\ No newline at end of file
diff --git a/learning/tour-of-beam/backend/samples/learning-content/java/module 2/unit-challenge/unit-info.yaml b/learning/tour-of-beam/backend/samples/learning-content/java/module 2/unit-challenge/unit-info.yaml
new file mode 100644
index 00000000000..ac65e8357d4
--- /dev/null
+++ b/learning/tour-of-beam/backend/samples/learning-content/java/module 2/unit-challenge/unit-info.yaml
@@ -0,0 +1,5 @@
+id: challenge21
+name: Challenge Name
+complexity: BASIC
+taskName: ChallengeTask
+solutionName: ChallengeSolution
\ No newline at end of file
diff --git a/learning/tour-of-beam/backend/samples/learning-content/java/module 2/unit-example/unit-info.yaml b/learning/tour-of-beam/backend/samples/learning-content/java/module 2/unit-example/unit-info.yaml
new file mode 100644
index 00000000000..674a6da7194
--- /dev/null
+++ b/learning/tour-of-beam/backend/samples/learning-content/java/module 2/unit-example/unit-info.yaml
@@ -0,0 +1,3 @@
+id: example21
+name: Example Unit Name
+taskName: ExampleName
\ No newline at end of file
diff --git a/learning/tour-of-beam/backend/samples/learning-content/python/content-info.yaml b/learning/tour-of-beam/backend/samples/learning-content/python/content-info.yaml
new file mode 100644
index 00000000000..ee9d329b503
--- /dev/null
+++ b/learning/tour-of-beam/backend/samples/learning-content/python/content-info.yaml
@@ -0,0 +1,3 @@
+sdk: Python
+content:
+ - module 1
diff --git a/learning/tour-of-beam/backend/samples/learning-content/python/module 1/group/group-info.yaml b/learning/tour-of-beam/backend/samples/learning-content/python/module 1/group/group-info.yaml
new file mode 100644
index 00000000000..1619bc19fb9
--- /dev/null
+++ b/learning/tour-of-beam/backend/samples/learning-content/python/module 1/group/group-info.yaml
@@ -0,0 +1,7 @@
+id: group
+name: The Group
+complexity: BASIC
+content:
+- unit-example
+- unit-challenge
+
diff --git a/learning/tour-of-beam/backend/samples/learning-content/python/module 1/group/unit-challenge/description.md b/learning/tour-of-beam/backend/samples/learning-content/python/module 1/group/unit-challenge/description.md
new file mode 100644
index 00000000000..1906064ed20
--- /dev/null
+++ b/learning/tour-of-beam/backend/samples/learning-content/python/module 1/group/unit-challenge/description.md
@@ -0,0 +1,3 @@
+## Challenge description
+
+bla bla bla
\ No newline at end of file
diff --git a/learning/tour-of-beam/backend/samples/learning-content/python/module 1/group/unit-challenge/hint1.md b/learning/tour-of-beam/backend/samples/learning-content/python/module 1/group/unit-challenge/hint1.md
new file mode 100644
index 00000000000..e5d1a67fa90
--- /dev/null
+++ b/learning/tour-of-beam/backend/samples/learning-content/python/module 1/group/unit-challenge/hint1.md
@@ -0,0 +1,3 @@
+## Hint 1
+
+apply yourself :)
\ No newline at end of file
diff --git a/learning/tour-of-beam/backend/samples/learning-content/python/module 1/group/unit-challenge/hint2.md b/learning/tour-of-beam/backend/samples/learning-content/python/module 1/group/unit-challenge/hint2.md
new file mode 100644
index 00000000000..0c425751be9
--- /dev/null
+++ b/learning/tour-of-beam/backend/samples/learning-content/python/module 1/group/unit-challenge/hint2.md
@@ -0,0 +1,3 @@
+## Hint 2
+
+apply more
\ No newline at end of file
diff --git a/learning/tour-of-beam/backend/samples/learning-content/python/module 1/group/unit-challenge/unit-info.yaml b/learning/tour-of-beam/backend/samples/learning-content/python/module 1/group/unit-challenge/unit-info.yaml
new file mode 100644
index 00000000000..e20b873a3e0
--- /dev/null
+++ b/learning/tour-of-beam/backend/samples/learning-content/python/module 1/group/unit-challenge/unit-info.yaml
@@ -0,0 +1,5 @@
+id: challenge1
+name: Challenge Name
+complexity: BASIC
+taskName: ChallengeTask
+solutionName: ChallengeSolution
\ No newline at end of file
diff --git a/learning/tour-of-beam/backend/samples/learning-content/python/module 1/group/unit-example/unit-info.yaml b/learning/tour-of-beam/backend/samples/learning-content/python/module 1/group/unit-example/unit-info.yaml
new file mode 100644
index 00000000000..ed0c81854cb
--- /dev/null
+++ b/learning/tour-of-beam/backend/samples/learning-content/python/module 1/group/unit-example/unit-info.yaml
@@ -0,0 +1,3 @@
+id: example1
+name: Example Unit Name
+taskName: ExampleName
\ No newline at end of file
diff --git a/learning/tour-of-beam/backend/samples/learning-content/python/module 1/intro-unit/unit-info.yaml b/learning/tour-of-beam/backend/samples/learning-content/python/module 1/intro-unit/unit-info.yaml
new file mode 100644
index 00000000000..1bcdb8d1abd
--- /dev/null
+++ b/learning/tour-of-beam/backend/samples/learning-content/python/module 1/intro-unit/unit-info.yaml
@@ -0,0 +1,3 @@
+id: intro-unit
+name: Intro Unit Name
+taskName: IntroTask
\ No newline at end of file
diff --git a/learning/tour-of-beam/backend/samples/learning-content/python/module 1/module-info.yaml b/learning/tour-of-beam/backend/samples/learning-content/python/module 1/module-info.yaml
new file mode 100644
index 00000000000..024d12fdc69
--- /dev/null
+++ b/learning/tour-of-beam/backend/samples/learning-content/python/module 1/module-info.yaml
@@ -0,0 +1,7 @@
+id: module1
+name: Module One
+complexity: BASIC
+content:
+- intro-unit
+- group
+
diff --git a/learning/tour-of-beam/backend/samples/learning-content_empty/java/content-info.yaml b/learning/tour-of-beam/backend/samples/learning-content_empty/java/content-info.yaml
new file mode 100644
index 00000000000..66ecd69e089
--- /dev/null
+++ b/learning/tour-of-beam/backend/samples/learning-content_empty/java/content-info.yaml
@@ -0,0 +1,2 @@
+sdk: Java
+content: []
\ No newline at end of file
diff --git a/learning/tour-of-beam/backend/samples/learning-content_empty/python/content-info.yaml b/learning/tour-of-beam/backend/samples/learning-content_empty/python/content-info.yaml
new file mode 100644
index 00000000000..cf165934c10
--- /dev/null
+++ b/learning/tour-of-beam/backend/samples/learning-content_empty/python/content-info.yaml
@@ -0,0 +1,2 @@
+sdk: Python
+content: []