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Posted to github@beam.apache.org by GitBox <gi...@apache.org> on 2021/06/18 21:00:06 UTC
[GitHub] [beam] BenWhitehead commented on a change in pull request #15005: [BEAM-8376] Google Cloud Firestore Connector - Add Firestore v1 Read Operations
BenWhitehead commented on a change in pull request #15005:
URL: https://github.com/apache/beam/pull/15005#discussion_r654656702
##########
File path: sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/firestore/RpcQosImpl.java
##########
@@ -700,6 +723,142 @@ public long nextBackOffMillis() {
}
}
+ /**
+ * This class implements a backoff algorithm similar to that of {@link
+ * org.apache.beam.sdk.util.FluentBackoff} with a could key differences:
+ *
+ * <ol>
+ * <li>A set of status code numbers may be specified to have a graceful evaluation
+ * <li>Gracefully evaluated status code numbers will increment a decaying counter to ensure if
+ * the graceful status code numbers occur more than once in the previous 60 seconds the
+ * regular backoff behavior will kick in.
+ * <li>The random number generator used to induce jitter is provided via constructor parameter
+ * rather than using {@link Math#random()}}
+ * </ol>
+ *
+ * The primary motivation for creating this implementation is to support streamed responses from
+ * Firestore. In the case of RunQuery and BatchGet the results are returned via stream. The result
+ * stream has a maximum lifetime of 60 seconds before it will be broken and an UNAVAILABLE status
+ * code will be raised. Give this UNAVAILABLE is expected for streams this class allows for
+ * defining a set of status code numbers which are give a grace count of 1 before backoff kicks
+ * in. When backoff does kick in, it is implemented using the same calculations as {@link
+ * org.apache.beam.sdk.util.FluentBackoff}.
+ */
+ static final class StatusCodeAwareBackoff {
+ private static final double RANDOMIZATION_FACTOR = 0.5;
Review comment:
It does, here is the declaration site https://github.com/apache/beam/blob/0c01636fc8610414859d946cb93eabc904123fc8/sdks/java/core/src/main/java/org/apache/beam/sdk/util/FluentBackoff.java#L36 and the use site https://github.com/apache/beam/blob/0c01636fc8610414859d946cb93eabc904123fc8/sdks/java/core/src/main/java/org/apache/beam/sdk/util/FluentBackoff.java#L198-L199
##########
File path: sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/firestore/FirestoreV1ReadFn.java
##########
@@ -0,0 +1,632 @@
+/*
+ * 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 org.apache.beam.sdk.io.gcp.firestore;
+
+import static java.util.Objects.requireNonNull;
+
+import com.google.api.gax.paging.AbstractPage;
+import com.google.api.gax.paging.AbstractPagedListResponse;
+import com.google.api.gax.rpc.ServerStream;
+import com.google.api.gax.rpc.ServerStreamingCallable;
+import com.google.api.gax.rpc.UnaryCallable;
+import com.google.cloud.firestore.v1.FirestoreClient.ListCollectionIdsPage;
+import com.google.cloud.firestore.v1.FirestoreClient.ListCollectionIdsPagedResponse;
+import com.google.cloud.firestore.v1.FirestoreClient.ListDocumentsPage;
+import com.google.cloud.firestore.v1.FirestoreClient.ListDocumentsPagedResponse;
+import com.google.cloud.firestore.v1.FirestoreClient.PartitionQueryPage;
+import com.google.cloud.firestore.v1.FirestoreClient.PartitionQueryPagedResponse;
+import com.google.cloud.firestore.v1.stub.FirestoreStub;
+import com.google.firestore.v1.BatchGetDocumentsRequest;
+import com.google.firestore.v1.BatchGetDocumentsResponse;
+import com.google.firestore.v1.Cursor;
+import com.google.firestore.v1.ListCollectionIdsRequest;
+import com.google.firestore.v1.ListCollectionIdsResponse;
+import com.google.firestore.v1.ListDocumentsRequest;
+import com.google.firestore.v1.ListDocumentsResponse;
+import com.google.firestore.v1.PartitionQueryRequest;
+import com.google.firestore.v1.PartitionQueryResponse;
+import com.google.firestore.v1.RunQueryRequest;
+import com.google.firestore.v1.RunQueryResponse;
+import com.google.firestore.v1.StructuredQuery;
+import com.google.firestore.v1.StructuredQuery.Direction;
+import com.google.firestore.v1.StructuredQuery.FieldReference;
+import com.google.firestore.v1.StructuredQuery.Order;
+import com.google.firestore.v1.Value;
+import com.google.protobuf.Message;
+import com.google.protobuf.ProtocolStringList;
+import java.io.Serializable;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import org.apache.beam.sdk.extensions.gcp.options.GcpOptions;
+import org.apache.beam.sdk.io.gcp.firestore.FirestoreDoFn.NonWindowAwareDoFn;
+import org.apache.beam.sdk.io.gcp.firestore.FirestoreV1Fn.HasRpcAttemptContext;
+import org.apache.beam.sdk.io.gcp.firestore.RpcQos.RpcAttempt.Context;
+import org.apache.beam.sdk.transforms.DoFn;
+import org.apache.beam.sdk.transforms.display.DisplayData;
+import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.annotations.VisibleForTesting;
+import org.checkerframework.checker.nullness.qual.Nullable;
+import org.joda.time.Instant;
+
+/**
+ * A collection of {@link org.apache.beam.sdk.transforms.DoFn DoFn}s for each of the supported read
+ * RPC methods from the Cloud Firestore V1 API.
+ */
+final class FirestoreV1ReadFn {
+
+ /**
+ * {@link DoFn} for Firestore V1 {@link RunQueryRequest}s.
+ *
+ * <p>This Fn uses a stream to obtain responses, each response from the stream will be output to
+ * the next stage of the pipeline. Each response from the stream represents an individual document
+ * with the associated metadata.
+ *
+ * <p>If an error is encountered while reading from the stream, the stream will attempt to resume
+ * rather than starting over. The restarting of the stream will continue within the scope of the
+ * completion of the request (meaning any possibility of resumption is contingent upon an attempt
+ * being available in the Qos budget).
+ *
+ * <p>All request quality-of-service is managed via the instance of {@link RpcQos} associated with
+ * the lifecycle of this Fn.
+ */
+ static final class RunQueryFn
+ extends StreamingFirestoreV1ReadFn<RunQueryRequest, RunQueryResponse> {
+
+ RunQueryFn(
+ JodaClock clock,
+ FirestoreStatefulComponentFactory firestoreStatefulComponentFactory,
+ RpcQosOptions rpcQosOptions) {
+ super(clock, firestoreStatefulComponentFactory, rpcQosOptions);
+ }
+
+ @Override
+ public Context getRpcAttemptContext() {
+ return FirestoreV1Fn.V1FnRpcAttemptContext.RunQuery;
+ }
+
+ @Override
+ protected ServerStreamingCallable<RunQueryRequest, RunQueryResponse> getCallable(
+ FirestoreStub firestoreStub) {
+ return firestoreStub.runQueryCallable();
+ }
+
+ @Override
+ protected RunQueryRequest setStartFrom(
+ RunQueryRequest element, RunQueryResponse runQueryResponse) {
+ StructuredQuery query = element.getStructuredQuery();
+ StructuredQuery.Builder builder;
+ List<Order> orderByList = query.getOrderByList();
+ // if the orderByList is empty that means the default sort of "__name__ ASC" will be used
+ // Before we can set the cursor to the last document name read, we need to explicitly add
+ // the order of "__name__ ASC" because a cursor value must map to an order by
+ if (orderByList.isEmpty()) {
+ builder =
+ query
+ .toBuilder()
+ .addOrderBy(
+ Order.newBuilder()
+ .setField(FieldReference.newBuilder().setFieldPath("__name__").build())
+ .setDirection(Direction.ASCENDING)
+ .build())
+ .setStartAt(
+ Cursor.newBuilder()
+ .setBefore(false)
+ .addValues(
+ Value.newBuilder()
+ .setReferenceValue(runQueryResponse.getDocument().getName())
+ .build()));
+ } else {
+ Cursor.Builder cursor = Cursor.newBuilder().setBefore(false);
+ Map<String, Value> fieldsMap = runQueryResponse.getDocument().getFieldsMap();
+ for (Order order : orderByList) {
+ String fieldPath = order.getField().getFieldPath();
+ Value value = fieldsMap.get(fieldPath);
+ if (value != null) {
+ cursor.addValues(value);
+ } else if ("__name__".equals(fieldPath)) {
+ cursor.addValues(
+ Value.newBuilder()
+ .setReferenceValue(runQueryResponse.getDocument().getName())
+ .build());
+ }
+ }
+ builder = query.toBuilder().setStartAt(cursor.build());
+ }
+ return element.toBuilder().setStructuredQuery(builder.build()).build();
+ }
+ }
+
+ /**
+ * {@link DoFn} for Firestore V1 {@link PartitionQueryRequest}s.
+ *
+ * <p>This Fn uses pagination to obtain responses, all pages will be aggregated before being
+ * emitted to the next stage of the pipeline. Aggregation of pages is necessary as the next step
+ * of pairing of cursors to create N queries must first sort all cursors. See <a target="_blank"
+ * rel="noopener noreferrer"
+ * href="https://cloud.google.com/firestore/docs/reference/rest/v1/projects.databases.documents/partitionQuery#request-body">{@code
+ * pageToken}s</a> documentation for details.
+ *
+ * <p>All request quality-of-service is managed via the instance of {@link RpcQos} associated with
+ * the lifecycle of this Fn.
+ */
+ static final class PartitionQueryFn
+ extends BaseFirestoreV1ReadFn<PartitionQueryRequest, PartitionQueryPair> {
+
+ public PartitionQueryFn(
+ JodaClock clock,
+ FirestoreStatefulComponentFactory firestoreStatefulComponentFactory,
+ RpcQosOptions rpcQosOptions) {
+ super(clock, firestoreStatefulComponentFactory, rpcQosOptions);
+ }
+
+ @Override
+ public Context getRpcAttemptContext() {
+ return FirestoreV1Fn.V1FnRpcAttemptContext.PartitionQuery;
+ }
+
+ @Override
+ public void processElement(ProcessContext context) throws Exception {
+ @SuppressWarnings("nullness")
+ final PartitionQueryRequest element =
+ requireNonNull(context.element(), "c.element() must be non null");
+
+ RpcQos.RpcReadAttempt attempt = rpcQos.newReadAttempt(getRpcAttemptContext());
+ PartitionQueryResponse.Builder aggregate = null;
+ while (true) {
+ if (!attempt.awaitSafeToProceed(clock.instant())) {
+ continue;
+ }
+
+ try {
+ PartitionQueryRequest request = setPageToken(element, aggregate);
+ attempt.recordRequestStart(clock.instant());
+ PartitionQueryPagedResponse pagedResponse =
+ firestoreStub.partitionQueryPagedCallable().call(request);
+ for (PartitionQueryPage page : pagedResponse.iteratePages()) {
+ attempt.recordRequestSuccessful(clock.instant());
+ PartitionQueryResponse response = page.getResponse();
+ if (aggregate == null) {
+ aggregate = response.toBuilder();
+ } else {
+ aggregate.addAllPartitions(response.getPartitionsList());
+ if (page.hasNextPage()) {
+ aggregate.setNextPageToken(response.getNextPageToken());
+ } else {
+ aggregate.clearNextPageToken();
+ }
+ }
+ if (page.hasNextPage()) {
+ attempt.recordRequestStart(clock.instant());
+ }
+ }
+ attempt.completeSuccess();
+ break;
+ } catch (RuntimeException exception) {
+ Instant end = clock.instant();
+ attempt.recordRequestFailed(end);
+ attempt.checkCanRetry(end, exception);
+ }
+ }
+ if (aggregate != null) {
+ context.output(new PartitionQueryPair(element, aggregate.build()));
+ }
+ }
+
+ private PartitionQueryRequest setPageToken(
+ PartitionQueryRequest request,
+ @edu.umd.cs.findbugs.annotations.Nullable PartitionQueryResponse.Builder aggregate) {
+ if (aggregate != null && aggregate.getNextPageToken() != null) {
+ return request.toBuilder().setPageToken(aggregate.getNextPageToken()).build();
+ }
+ return request;
+ }
+ }
+
+ /**
+ * {@link DoFn} for Firestore V1 {@link ListDocumentsRequest}s.
+ *
+ * <p>This Fn uses pagination to obtain responses, the response from each page will be output to
+ * the next stage of the pipeline.
+ *
+ * <p>All request quality-of-service is managed via the instance of {@link RpcQos} associated with
+ * the lifecycle of this Fn.
+ */
+ static final class ListDocumentsFn
+ extends PaginatedFirestoreV1ReadFn<
+ ListDocumentsRequest,
+ ListDocumentsPagedResponse,
+ ListDocumentsPage,
+ ListDocumentsResponse> {
+
+ ListDocumentsFn(
+ JodaClock clock,
+ FirestoreStatefulComponentFactory firestoreStatefulComponentFactory,
+ RpcQosOptions rpcQosOptions) {
+ super(clock, firestoreStatefulComponentFactory, rpcQosOptions);
+ }
+
+ @Override
+ public Context getRpcAttemptContext() {
+ return FirestoreV1Fn.V1FnRpcAttemptContext.ListDocuments;
+ }
+
+ @Override
+ protected UnaryCallable<ListDocumentsRequest, ListDocumentsPagedResponse> getCallable(
+ FirestoreStub firestoreStub) {
+ return firestoreStub.listDocumentsPagedCallable();
+ }
+
+ @Override
+ protected ListDocumentsRequest setPageToken(
+ ListDocumentsRequest request, String nextPageToken) {
+ return request.toBuilder().setPageToken(nextPageToken).build();
+ }
+ }
+
+ /**
+ * {@link DoFn} for Firestore V1 {@link ListCollectionIdsRequest}s.
+ *
+ * <p>This Fn uses pagination to obtain responses, the response from each page will be output to
+ * the next stage of the pipeline.
+ *
+ * <p>All request quality-of-service is managed via the instance of {@link RpcQos} associated with
+ * the lifecycle of this Fn.
+ */
+ static final class ListCollectionIdsFn
+ extends PaginatedFirestoreV1ReadFn<
+ ListCollectionIdsRequest,
+ ListCollectionIdsPagedResponse,
+ ListCollectionIdsPage,
+ ListCollectionIdsResponse> {
+
+ ListCollectionIdsFn(
+ JodaClock clock,
+ FirestoreStatefulComponentFactory firestoreStatefulComponentFactory,
+ RpcQosOptions rpcQosOptions) {
+ super(clock, firestoreStatefulComponentFactory, rpcQosOptions);
+ }
+
+ @Override
+ public Context getRpcAttemptContext() {
+ return FirestoreV1Fn.V1FnRpcAttemptContext.ListCollectionIds;
+ }
+
+ @Override
+ protected UnaryCallable<ListCollectionIdsRequest, ListCollectionIdsPagedResponse> getCallable(
+ FirestoreStub firestoreStub) {
+ return firestoreStub.listCollectionIdsPagedCallable();
+ }
+
+ @Override
+ protected ListCollectionIdsRequest setPageToken(
+ ListCollectionIdsRequest request, String nextPageToken) {
+ return request.toBuilder().setPageToken(nextPageToken).build();
+ }
+ }
+
+ /**
+ * {@link DoFn} for Firestore V1 {@link BatchGetDocumentsRequest}s.
+ *
+ * <p>This Fn uses a stream to obtain responses, each response from the stream will be output to
+ * the next stage of the pipeline. Each response from the stream represents an individual document
+ * with the associated metadata.
+ *
+ * <p>All request quality-of-service is managed via the instance of {@link RpcQos} associated with
+ * the lifecycle of this Fn.
+ */
+ static final class BatchGetDocumentsFn
+ extends StreamingFirestoreV1ReadFn<BatchGetDocumentsRequest, BatchGetDocumentsResponse> {
+
+ BatchGetDocumentsFn(
+ JodaClock clock,
+ FirestoreStatefulComponentFactory firestoreStatefulComponentFactory,
+ RpcQosOptions rpcQosOptions) {
+ super(clock, firestoreStatefulComponentFactory, rpcQosOptions);
+ }
+
+ @Override
+ public Context getRpcAttemptContext() {
+ return FirestoreV1Fn.V1FnRpcAttemptContext.BatchGetDocuments;
+ }
+
+ @Override
+ protected ServerStreamingCallable<BatchGetDocumentsRequest, BatchGetDocumentsResponse>
+ getCallable(FirestoreStub firestoreStub) {
+ return firestoreStub.batchGetDocumentsCallable();
+ }
+
+ @Override
+ protected BatchGetDocumentsRequest setStartFrom(
+ BatchGetDocumentsRequest originalRequest, BatchGetDocumentsResponse mostRecentResponse) {
+ int startIndex = -1;
+ ProtocolStringList documentsList = originalRequest.getDocumentsList();
+ String missing = mostRecentResponse.getMissing();
+ String foundName =
+ mostRecentResponse.hasFound() ? mostRecentResponse.getFound().getName() : null;
+ // we only scan until the second to last originalRequest. If the final element were to be
+ // reached
+ // the full request would be complete and we wouldn't be in this scenario
+ int maxIndex = documentsList.size() - 2;
+ for (int i = 0; i <= maxIndex; i++) {
Review comment:
We potentially could, but that'd require a refactor to the `org.apache.beam.sdk.io.gcp.firestore.FirestoreV1ReadFn.StreamingFirestoreV1ReadFn` to track number of elements received (which is shared with `RunQuery`). I'm not sure it'd provide much material value though.
Even for a list of 10m document names a linear scan for the 2nd to last value can happen in ~120ms which compared to an RPC is negligible.
<details>
<summary>Scan perf test</summary>
##### Test
```java
@Test
public void scanMicroBench() {
List<String> strings = IntStream.rangeClosed(1, 10_000_000)
.mapToObj(i -> String.format("projects/p1/databases/d1/documents/c1/doc2/c2/doc%d", i))
.collect(Collectors.toList());
List<String> searchValues = List.of(
"projects/p1/databases/d1/documents/c1/doc2/c2/doc100",
"projects/p1/databases/d1/documents/c1/doc2/c2/doc10000",
"projects/p1/databases/d1/documents/c1/doc2/c2/doc1000000",
"projects/p1/databases/d1/documents/c1/doc2/c2/doc9999999"
);
for (String searchValue : searchValues) {
var sw = Stopwatch.createStarted();
for (int i = 0; i < strings.size(); i++) {
String s = strings.get(i);
if (searchValue.equals(s)) {
break;
}
}
var stop = sw.stop();
System.out.printf("search[%s] %s%n", searchValue, stop.toString());
}
}
```
##### Output
```
search[projects/p1/databases/d1/documents/c1/doc2/c2/doc100] 18.72 μs
search[projects/p1/databases/d1/documents/c1/doc2/c2/doc10000] 683.9 μs
search[projects/p1/databases/d1/documents/c1/doc2/c2/doc1000000] 19.83 ms
search[projects/p1/databases/d1/documents/c1/doc2/c2/doc9999999] 127.4 ms
```
</details>
##########
File path: sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/firestore/FirestoreV1ReadFn.java
##########
@@ -0,0 +1,632 @@
+/*
+ * 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 org.apache.beam.sdk.io.gcp.firestore;
+
+import static java.util.Objects.requireNonNull;
+
+import com.google.api.gax.paging.AbstractPage;
+import com.google.api.gax.paging.AbstractPagedListResponse;
+import com.google.api.gax.rpc.ServerStream;
+import com.google.api.gax.rpc.ServerStreamingCallable;
+import com.google.api.gax.rpc.UnaryCallable;
+import com.google.cloud.firestore.v1.FirestoreClient.ListCollectionIdsPage;
+import com.google.cloud.firestore.v1.FirestoreClient.ListCollectionIdsPagedResponse;
+import com.google.cloud.firestore.v1.FirestoreClient.ListDocumentsPage;
+import com.google.cloud.firestore.v1.FirestoreClient.ListDocumentsPagedResponse;
+import com.google.cloud.firestore.v1.FirestoreClient.PartitionQueryPage;
+import com.google.cloud.firestore.v1.FirestoreClient.PartitionQueryPagedResponse;
+import com.google.cloud.firestore.v1.stub.FirestoreStub;
+import com.google.firestore.v1.BatchGetDocumentsRequest;
+import com.google.firestore.v1.BatchGetDocumentsResponse;
+import com.google.firestore.v1.Cursor;
+import com.google.firestore.v1.ListCollectionIdsRequest;
+import com.google.firestore.v1.ListCollectionIdsResponse;
+import com.google.firestore.v1.ListDocumentsRequest;
+import com.google.firestore.v1.ListDocumentsResponse;
+import com.google.firestore.v1.PartitionQueryRequest;
+import com.google.firestore.v1.PartitionQueryResponse;
+import com.google.firestore.v1.RunQueryRequest;
+import com.google.firestore.v1.RunQueryResponse;
+import com.google.firestore.v1.StructuredQuery;
+import com.google.firestore.v1.StructuredQuery.Direction;
+import com.google.firestore.v1.StructuredQuery.FieldReference;
+import com.google.firestore.v1.StructuredQuery.Order;
+import com.google.firestore.v1.Value;
+import com.google.protobuf.Message;
+import com.google.protobuf.ProtocolStringList;
+import java.io.Serializable;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import org.apache.beam.sdk.extensions.gcp.options.GcpOptions;
+import org.apache.beam.sdk.io.gcp.firestore.FirestoreDoFn.NonWindowAwareDoFn;
+import org.apache.beam.sdk.io.gcp.firestore.FirestoreV1Fn.HasRpcAttemptContext;
+import org.apache.beam.sdk.io.gcp.firestore.RpcQos.RpcAttempt.Context;
+import org.apache.beam.sdk.transforms.DoFn;
+import org.apache.beam.sdk.transforms.display.DisplayData;
+import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.annotations.VisibleForTesting;
+import org.checkerframework.checker.nullness.qual.Nullable;
+import org.joda.time.Instant;
+
+/**
+ * A collection of {@link org.apache.beam.sdk.transforms.DoFn DoFn}s for each of the supported read
+ * RPC methods from the Cloud Firestore V1 API.
+ */
+final class FirestoreV1ReadFn {
+
+ /**
+ * {@link DoFn} for Firestore V1 {@link RunQueryRequest}s.
+ *
+ * <p>This Fn uses a stream to obtain responses, each response from the stream will be output to
+ * the next stage of the pipeline. Each response from the stream represents an individual document
+ * with the associated metadata.
+ *
+ * <p>If an error is encountered while reading from the stream, the stream will attempt to resume
+ * rather than starting over. The restarting of the stream will continue within the scope of the
+ * completion of the request (meaning any possibility of resumption is contingent upon an attempt
+ * being available in the Qos budget).
+ *
+ * <p>All request quality-of-service is managed via the instance of {@link RpcQos} associated with
+ * the lifecycle of this Fn.
+ */
+ static final class RunQueryFn
+ extends StreamingFirestoreV1ReadFn<RunQueryRequest, RunQueryResponse> {
+
+ RunQueryFn(
+ JodaClock clock,
+ FirestoreStatefulComponentFactory firestoreStatefulComponentFactory,
+ RpcQosOptions rpcQosOptions) {
+ super(clock, firestoreStatefulComponentFactory, rpcQosOptions);
+ }
+
+ @Override
+ public Context getRpcAttemptContext() {
+ return FirestoreV1Fn.V1FnRpcAttemptContext.RunQuery;
+ }
+
+ @Override
+ protected ServerStreamingCallable<RunQueryRequest, RunQueryResponse> getCallable(
+ FirestoreStub firestoreStub) {
+ return firestoreStub.runQueryCallable();
+ }
+
+ @Override
+ protected RunQueryRequest setStartFrom(
+ RunQueryRequest element, RunQueryResponse runQueryResponse) {
+ StructuredQuery query = element.getStructuredQuery();
+ StructuredQuery.Builder builder;
+ List<Order> orderByList = query.getOrderByList();
+ // if the orderByList is empty that means the default sort of "__name__ ASC" will be used
+ // Before we can set the cursor to the last document name read, we need to explicitly add
+ // the order of "__name__ ASC" because a cursor value must map to an order by
+ if (orderByList.isEmpty()) {
+ builder =
+ query
+ .toBuilder()
+ .addOrderBy(
+ Order.newBuilder()
+ .setField(FieldReference.newBuilder().setFieldPath("__name__").build())
+ .setDirection(Direction.ASCENDING)
+ .build())
+ .setStartAt(
+ Cursor.newBuilder()
+ .setBefore(false)
+ .addValues(
+ Value.newBuilder()
+ .setReferenceValue(runQueryResponse.getDocument().getName())
+ .build()));
+ } else {
+ Cursor.Builder cursor = Cursor.newBuilder().setBefore(false);
+ Map<String, Value> fieldsMap = runQueryResponse.getDocument().getFieldsMap();
+ for (Order order : orderByList) {
+ String fieldPath = order.getField().getFieldPath();
+ Value value = fieldsMap.get(fieldPath);
+ if (value != null) {
+ cursor.addValues(value);
+ } else if ("__name__".equals(fieldPath)) {
+ cursor.addValues(
+ Value.newBuilder()
+ .setReferenceValue(runQueryResponse.getDocument().getName())
+ .build());
+ }
+ }
+ builder = query.toBuilder().setStartAt(cursor.build());
+ }
+ return element.toBuilder().setStructuredQuery(builder.build()).build();
+ }
+ }
+
+ /**
+ * {@link DoFn} for Firestore V1 {@link PartitionQueryRequest}s.
+ *
+ * <p>This Fn uses pagination to obtain responses, all pages will be aggregated before being
+ * emitted to the next stage of the pipeline. Aggregation of pages is necessary as the next step
+ * of pairing of cursors to create N queries must first sort all cursors. See <a target="_blank"
+ * rel="noopener noreferrer"
+ * href="https://cloud.google.com/firestore/docs/reference/rest/v1/projects.databases.documents/partitionQuery#request-body">{@code
+ * pageToken}s</a> documentation for details.
+ *
+ * <p>All request quality-of-service is managed via the instance of {@link RpcQos} associated with
+ * the lifecycle of this Fn.
+ */
+ static final class PartitionQueryFn
+ extends BaseFirestoreV1ReadFn<PartitionQueryRequest, PartitionQueryPair> {
+
+ public PartitionQueryFn(
+ JodaClock clock,
+ FirestoreStatefulComponentFactory firestoreStatefulComponentFactory,
+ RpcQosOptions rpcQosOptions) {
+ super(clock, firestoreStatefulComponentFactory, rpcQosOptions);
+ }
+
+ @Override
+ public Context getRpcAttemptContext() {
+ return FirestoreV1Fn.V1FnRpcAttemptContext.PartitionQuery;
+ }
+
+ @Override
+ public void processElement(ProcessContext context) throws Exception {
+ @SuppressWarnings("nullness")
+ final PartitionQueryRequest element =
+ requireNonNull(context.element(), "c.element() must be non null");
+
+ RpcQos.RpcReadAttempt attempt = rpcQos.newReadAttempt(getRpcAttemptContext());
+ PartitionQueryResponse.Builder aggregate = null;
+ while (true) {
+ if (!attempt.awaitSafeToProceed(clock.instant())) {
+ continue;
+ }
+
+ try {
+ PartitionQueryRequest request = setPageToken(element, aggregate);
+ attempt.recordRequestStart(clock.instant());
+ PartitionQueryPagedResponse pagedResponse =
+ firestoreStub.partitionQueryPagedCallable().call(request);
+ for (PartitionQueryPage page : pagedResponse.iteratePages()) {
+ attempt.recordRequestSuccessful(clock.instant());
+ PartitionQueryResponse response = page.getResponse();
+ if (aggregate == null) {
+ aggregate = response.toBuilder();
+ } else {
+ aggregate.addAllPartitions(response.getPartitionsList());
+ if (page.hasNextPage()) {
+ aggregate.setNextPageToken(response.getNextPageToken());
+ } else {
+ aggregate.clearNextPageToken();
+ }
+ }
+ if (page.hasNextPage()) {
+ attempt.recordRequestStart(clock.instant());
+ }
+ }
+ attempt.completeSuccess();
+ break;
+ } catch (RuntimeException exception) {
+ Instant end = clock.instant();
+ attempt.recordRequestFailed(end);
+ attempt.checkCanRetry(end, exception);
+ }
+ }
+ if (aggregate != null) {
+ context.output(new PartitionQueryPair(element, aggregate.build()));
+ }
+ }
+
+ private PartitionQueryRequest setPageToken(
+ PartitionQueryRequest request,
+ @edu.umd.cs.findbugs.annotations.Nullable PartitionQueryResponse.Builder aggregate) {
+ if (aggregate != null && aggregate.getNextPageToken() != null) {
+ return request.toBuilder().setPageToken(aggregate.getNextPageToken()).build();
+ }
+ return request;
+ }
+ }
+
+ /**
+ * {@link DoFn} for Firestore V1 {@link ListDocumentsRequest}s.
+ *
+ * <p>This Fn uses pagination to obtain responses, the response from each page will be output to
+ * the next stage of the pipeline.
+ *
+ * <p>All request quality-of-service is managed via the instance of {@link RpcQos} associated with
+ * the lifecycle of this Fn.
+ */
+ static final class ListDocumentsFn
+ extends PaginatedFirestoreV1ReadFn<
+ ListDocumentsRequest,
+ ListDocumentsPagedResponse,
+ ListDocumentsPage,
+ ListDocumentsResponse> {
+
+ ListDocumentsFn(
+ JodaClock clock,
+ FirestoreStatefulComponentFactory firestoreStatefulComponentFactory,
+ RpcQosOptions rpcQosOptions) {
+ super(clock, firestoreStatefulComponentFactory, rpcQosOptions);
+ }
+
+ @Override
+ public Context getRpcAttemptContext() {
+ return FirestoreV1Fn.V1FnRpcAttemptContext.ListDocuments;
+ }
+
+ @Override
+ protected UnaryCallable<ListDocumentsRequest, ListDocumentsPagedResponse> getCallable(
+ FirestoreStub firestoreStub) {
+ return firestoreStub.listDocumentsPagedCallable();
+ }
+
+ @Override
+ protected ListDocumentsRequest setPageToken(
+ ListDocumentsRequest request, String nextPageToken) {
+ return request.toBuilder().setPageToken(nextPageToken).build();
+ }
+ }
+
+ /**
+ * {@link DoFn} for Firestore V1 {@link ListCollectionIdsRequest}s.
+ *
+ * <p>This Fn uses pagination to obtain responses, the response from each page will be output to
+ * the next stage of the pipeline.
+ *
+ * <p>All request quality-of-service is managed via the instance of {@link RpcQos} associated with
+ * the lifecycle of this Fn.
+ */
+ static final class ListCollectionIdsFn
+ extends PaginatedFirestoreV1ReadFn<
+ ListCollectionIdsRequest,
+ ListCollectionIdsPagedResponse,
+ ListCollectionIdsPage,
+ ListCollectionIdsResponse> {
+
+ ListCollectionIdsFn(
+ JodaClock clock,
+ FirestoreStatefulComponentFactory firestoreStatefulComponentFactory,
+ RpcQosOptions rpcQosOptions) {
+ super(clock, firestoreStatefulComponentFactory, rpcQosOptions);
+ }
+
+ @Override
+ public Context getRpcAttemptContext() {
+ return FirestoreV1Fn.V1FnRpcAttemptContext.ListCollectionIds;
+ }
+
+ @Override
+ protected UnaryCallable<ListCollectionIdsRequest, ListCollectionIdsPagedResponse> getCallable(
+ FirestoreStub firestoreStub) {
+ return firestoreStub.listCollectionIdsPagedCallable();
+ }
+
+ @Override
+ protected ListCollectionIdsRequest setPageToken(
+ ListCollectionIdsRequest request, String nextPageToken) {
+ return request.toBuilder().setPageToken(nextPageToken).build();
+ }
+ }
+
+ /**
+ * {@link DoFn} for Firestore V1 {@link BatchGetDocumentsRequest}s.
+ *
+ * <p>This Fn uses a stream to obtain responses, each response from the stream will be output to
+ * the next stage of the pipeline. Each response from the stream represents an individual document
+ * with the associated metadata.
+ *
+ * <p>All request quality-of-service is managed via the instance of {@link RpcQos} associated with
+ * the lifecycle of this Fn.
+ */
+ static final class BatchGetDocumentsFn
+ extends StreamingFirestoreV1ReadFn<BatchGetDocumentsRequest, BatchGetDocumentsResponse> {
+
+ BatchGetDocumentsFn(
+ JodaClock clock,
+ FirestoreStatefulComponentFactory firestoreStatefulComponentFactory,
+ RpcQosOptions rpcQosOptions) {
+ super(clock, firestoreStatefulComponentFactory, rpcQosOptions);
+ }
+
+ @Override
+ public Context getRpcAttemptContext() {
+ return FirestoreV1Fn.V1FnRpcAttemptContext.BatchGetDocuments;
+ }
+
+ @Override
+ protected ServerStreamingCallable<BatchGetDocumentsRequest, BatchGetDocumentsResponse>
+ getCallable(FirestoreStub firestoreStub) {
+ return firestoreStub.batchGetDocumentsCallable();
+ }
+
+ @Override
+ protected BatchGetDocumentsRequest setStartFrom(
+ BatchGetDocumentsRequest originalRequest, BatchGetDocumentsResponse mostRecentResponse) {
+ int startIndex = -1;
+ ProtocolStringList documentsList = originalRequest.getDocumentsList();
+ String missing = mostRecentResponse.getMissing();
+ String foundName =
+ mostRecentResponse.hasFound() ? mostRecentResponse.getFound().getName() : null;
+ // we only scan until the second to last originalRequest. If the final element were to be
+ // reached
+ // the full request would be complete and we wouldn't be in this scenario
+ int maxIndex = documentsList.size() - 2;
+ for (int i = 0; i <= maxIndex; i++) {
+ String docName = documentsList.get(i);
+ if (docName.equals(missing) || docName.equals(foundName)) {
+ startIndex = i;
+ break;
+ }
+ }
+ if (0 <= startIndex) {
+ BatchGetDocumentsRequest.Builder builder = originalRequest.toBuilder().clearDocuments();
+ documentsList.stream()
+ .skip(startIndex + 1) // start from the next entry from the one we found
+ .forEach(builder::addDocuments);
+ return builder.build();
+ }
+ // unable to find a match, return the original request
+ return originalRequest;
Review comment:
I can update it to throw an error. What information would like to see included in the error message?
Something like the following?
```suggestion
throw new IllegalStateException(
String.format(
"Unable to determine BatchGet resumption point. Most recently received doc __name__ '%s'",
foundName != null ? foundName : missing));
}
```
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