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config.go
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config.go
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// Copyright 2017 Google Inc.
//
// 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.
// Package db provides types and methods database operations.
package db
import (
"log"
"os"
"google.golang.org/appengine"
"github.com/jinzhu/gorm"
)
type cloudSQLConfig struct {
Username, Password string
}
func configureCloudSQL(config cloudSQLConfig) (*gorm.DB, error) {
if appengine.IsDevAppServer() {
// Running locally.
return newORMClient(MySQLConfig{
Username: config.Username,
Password: config.Password,
Host: "localhost",
Port: 3306,
})
}
// Running in production.
return newORMClient(MySQLConfig{
Username: config.Username,
Password: config.Password,
Instance: mustGetenv("CLOUDSQL_CONNECTION_NAME"),
})
}
func mustGetenv(k string) string {
v := os.Getenv(k)
if v == "" {
log.Panicf("%s environment variable not set.", k)
}
return v
}
// GetConnection returns the configured db connection or nil
func GetConnection() *gorm.DB {
var err error
if connection == nil {
connection, err = configureCloudSQL(cloudSQLConfig{
Username: mustGetenv("CLOUDSQL_USER"),
Password: mustGetenv("CLOUDSQL_PASSWORD"),
})
if err != nil || connection == nil {
log.Fatalf("Error connecting: %v", err)
}
return connection
}
return connection
}