101 lines
2.0 KiB
Go
101 lines
2.0 KiB
Go
package database
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import (
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"context"
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"database/sql"
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"log"
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"net/url"
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"os"
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"time"
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"github.com/pkg/errors"
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// Load mysql driver
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_ "github.com/go-sql-driver/mysql"
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"github.com/golang-migrate/migrate"
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"github.com/golang-migrate/migrate/database/mysql"
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// Migrate from file
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_ "github.com/golang-migrate/migrate/source/file"
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)
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// SetupDatabase connects to the database using environment variables
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func SetupDatabase() (*sql.DB, error) {
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address, err := url.Parse(os.Getenv("MYSQL_URL"))
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if err != nil {
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return nil, errors.Wrapf(err, "Could not parse mysql url")
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}
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if address.String() == "" {
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return nil, errors.New("Environment variable MYSQL_URL missing, exiting")
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}
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queryValues := address.Query()
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queryValues.Add("multiStatements", "true")
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queryValues.Add("parseTime", "true")
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address.RawQuery = queryValues.Encode()
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log.Printf("Connecting to database: %s", address)
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var db *sql.DB
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tryCount := 0
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for {
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db, err = sql.Open("mysql", address.String())
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if err != nil {
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if tryCount < 4 {
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tryCount++
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log.Printf("WARN: Could not connect to database: %s. Will retry after 1 second", err.Error())
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time.Sleep(time.Second)
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continue
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} else {
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return nil, errors.New("Could not connect to database, exiting")
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}
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}
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break
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}
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ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
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defer cancel()
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if err := db.PingContext(ctx); err != nil {
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return nil, errors.Wrap(err, "Could not ping database, exiting")
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}
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db.SetMaxOpenConns(80)
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return db, nil
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}
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func MigrateDatabase(db *sql.DB) error {
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driver, err := mysql.WithInstance(db, &mysql.Config{})
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if err != nil {
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return err
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}
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m, err := migrate.NewWithDatabaseInstance(
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"file://database/migrations",
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"mysql",
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driver,
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)
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if err != nil {
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return err
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}
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if err := m.Up(); err != nil {
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if err.Error() == "no change" {
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log.Println("Database is up to date")
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} else {
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return err
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}
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} else {
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log.Println("Database migrated")
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}
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return nil
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}
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