[GitHub] [servicecomb-kie] tianxiaoliang commented on a change in pull request #22: refactor code

[GitBox <gi...@apache.org>]

tianxiaoliang commented on a change in pull request #22: refactor code
URL: https://github.com/apache/servicecomb-kie/pull/22#discussion_r308592406
 
 

 ##########
 File path: server/db/db.go
 ##########
 @@ -0,0 +1,115 @@
+/*
+ * 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 db manage db connection
+package db
+
+import (
+	"context"
+	"crypto/tls"
+	"crypto/x509"
+	"errors"
+	"fmt"
+	"github.com/apache/servicecomb-kie/server/config"
+	"github.com/go-mesh/openlogging"
+	"go.mongodb.org/mongo-driver/mongo"
+	"go.mongodb.org/mongo-driver/mongo/options"
+	"io/ioutil"
+	"time"
+)
+
+//const for db name and collection name
+const (
+	Name                    = "kie"
+	CollectionLabel         = "label"
+	CollectionKV            = "kv"
+	CollectionLabelRevision = "label_revision"
+
+	DefaultTimeout   = 5 * time.Second
+	DefaultValueType = "text"
+)
+
+//db errors
+var (
+	ErrMissingDomain          = errors.New("domain info missing, illegal access")
+	ErrKeyNotExists           = errors.New("key with labels does not exits")
+	ErrLabelNotExists         = errors.New("labels does not exits")
+	ErrTooMany                = errors.New("key with labels should be only one")
+	ErrKeyMustNotEmpty        = errors.New("must supply key if you want to get exact one result")
+	ErrRevisionNotExist       = errors.New("label revision not exist")
+	ErrKVIDIsNil              = errors.New("kvID id is nil")
+	ErrKvIDAndLabelIDNotMatch = errors.New("kvID and labelID do not match")
+	ErrRootCAMissing          = errors.New("rootCAFile is empty in config file")
+)
+
+var client *mongo.Client
+
+//Timeout db operation time out
+var Timeout time.Duration
+
+//Init prepare params
+func Init() error {
+	var err error
+	if config.GetDB().Timeout != "" {
+		Timeout, err = time.ParseDuration(config.GetDB().Timeout)
+		if err != nil {
+			return errors.New("timeout setting invalid:" + config.GetDB().Timeout)
+		}
+	}
+	if Timeout == 0 {
+		Timeout = DefaultTimeout
+	}
+	return nil
+}
+
+//GetClient create a new mongo db client
+//if client is created, just return.
+func GetClient() (*mongo.Client, error) {
 
 Review comment:
   thread safe

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