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config.go
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config.go
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// Copyright 2019 Google LLC
//
// 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
//
// https://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.
// Configure database connection
package services
import (
"database/sql"
"errors"
"fmt"
"log"
"os"
_ "github.com/go-sql-driver/mysql"
)
var messageService MessageService
func getDBConnection() (db *sql.DB, err error) {
conStr, ok := os.LookupEnv("MYSQL_CONNECTION")
if ok {
return sql.Open("mysql", conStr)
} else {
dbUser, ok := os.LookupEnv("DB_USER")
if ok {
dbPass, _ := os.LookupEnv("DB_PASSWORD")
conStr = fmt.Sprintf("%s:%s@tcp(localhost:3306)/messagesdb", dbUser,
dbPass)
return sql.Open("mysql", conStr)
} else {
return db, errors.New("No database connection information provided")
}
}
}
// Gets an the MessageService if already instantiated, or creates a new one
func GetMessageService() MessageService {
if messageService == nil {
messageService = newMessageService()
}
return messageService
}
// Instantiates a MessageService for use in the app
func newMessageService() MessageService {
log.Printf("newMessageService, enter\n")
mService, ok := os.LookupEnv("MESSAGE_SERVICE")
if ok && mService == "mock" {
return MockMessageService{}
}
dbConn, err := getDBConnection()
if err != nil {
log.Fatal("service.NewMessageService: error, ", err)
}
return SQLMessagingService{dbConn}
}