146 lines
3.7 KiB
Go
146 lines
3.7 KiB
Go
// Copyright 2018 Drone.IO Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package datastore
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import (
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"database/sql"
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"os"
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"time"
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"github.com/drone/drone/store"
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"github.com/drone/drone/store/datastore/ddl"
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"github.com/russross/meddler"
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"github.com/Sirupsen/logrus"
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)
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// datastore is an implementation of a model.Store built on top
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// of the sql/database driver with a relational database backend.
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type datastore struct {
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*sql.DB
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driver string
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config string
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}
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// New creates a database connection for the given driver and datasource
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// and returns a new Store.
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func New(driver, config string) store.Store {
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return &datastore{
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DB: open(driver, config),
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driver: driver,
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config: config,
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}
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}
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// From returns a Store using an existing database connection.
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func From(db *sql.DB) store.Store {
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return &datastore{DB: db}
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}
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// open opens a new database connection with the specified
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// driver and connection string and returns a store.
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func open(driver, config string) *sql.DB {
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db, err := sql.Open(driver, config)
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if err != nil {
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logrus.Errorln(err)
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logrus.Fatalln("database connection failed")
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}
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if driver == "mysql" {
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// per issue https://github.com/go-sql-driver/mysql/issues/257
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db.SetMaxIdleConns(0)
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}
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setupMeddler(driver)
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if err := pingDatabase(db); err != nil {
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logrus.Errorln(err)
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logrus.Fatalln("database ping attempts failed")
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}
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if err := setupDatabase(driver, db); err != nil {
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logrus.Errorln(err)
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logrus.Fatalln("migration failed")
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}
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return db
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}
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// openTest opens a new database connection for testing purposes.
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// The database driver and connection string are provided by
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// environment variables, with fallback to in-memory sqlite.
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func openTest() *sql.DB {
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var (
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driver = "sqlite3"
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config = ":memory:"
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)
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if os.Getenv("DATABASE_DRIVER") != "" {
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driver = os.Getenv("DATABASE_DRIVER")
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config = os.Getenv("DATABASE_CONFIG")
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}
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return open(driver, config)
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}
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// newTest creates a new database connection for testing purposes.
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// The database driver and connection string are provided by
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// environment variables, with fallback to in-memory sqlite.
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func newTest() *datastore {
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var (
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driver = "sqlite3"
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config = ":memory:"
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)
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if os.Getenv("DATABASE_DRIVER") != "" {
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driver = os.Getenv("DATABASE_DRIVER")
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config = os.Getenv("DATABASE_CONFIG")
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}
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return &datastore{
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DB: open(driver, config),
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driver: driver,
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config: config,
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}
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}
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// helper function to ping the database with backoff to ensure
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// a connection can be established before we proceed with the
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// database setup and migration.
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func pingDatabase(db *sql.DB) (err error) {
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for i := 0; i < 30; i++ {
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err = db.Ping()
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if err == nil {
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return
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}
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logrus.Infof("database ping failed. retry in 1s")
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time.Sleep(time.Second)
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}
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return
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}
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// helper function to setup the databsae by performing
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// automated database migration steps.
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func setupDatabase(driver string, db *sql.DB) error {
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return ddl.Migrate(driver, db)
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}
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// helper function to setup the meddler default driver
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// based on the selected driver name.
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func setupMeddler(driver string) {
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switch driver {
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case "sqlite3":
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meddler.Default = meddler.SQLite
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case "mysql":
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meddler.Default = meddler.MySQL
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case "postgres":
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meddler.Default = meddler.PostgreSQL
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}
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}
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