75 lines
2.1 KiB
Go
75 lines
2.1 KiB
Go
package db
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import (
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"log"
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"os"
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"time"
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"github.com/pkg/errors"
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"gorm.io/driver/postgres"
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"gorm.io/driver/sqlite"
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"gorm.io/gorm"
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"gorm.io/gorm/logger"
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)
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const (
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// EnvDatabaseDriver is the key for the 'database driver' environment variable.
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EnvDatabaseDriver = "RUSHLINK_DATABASE_DRIVER"
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// EnvDatabasePath is the key for the 'database path' environment variable.
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EnvDatabasePath = "RUSHLINK_DATABASE_PATH"
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// EnvPostgresURL is the key for the 'postgresql URL' environment variable.
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EnvPostgresURL = "RUSHLINK_POSTGRES_URL"
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// EnvFileStorePath is the key for the environment variable locating the file store.
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EnvFileStorePath = "RUSHLINK_FILE_STORE_PATH"
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)
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// Database is the main rushlink database type.
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//
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// Open a database using OpenDBFromEnvironment(). Closing is not necessary.
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// Only one instance of DB should exist in a program at any moment.
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type Database = gorm.DB
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var (
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gormLogger logger.Interface = logger.New(log.New(os.Stdout, "\r\n", log.LstdFlags), logger.Config{
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SlowThreshold: 50 * time.Millisecond,
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LogLevel: logger.Error,
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Colorful: true,
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})
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gormConfig = gorm.Config{Logger: gormLogger}
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)
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// OpenDBFromEnvironment tries to open an SQL database, described by
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func OpenDBFromEnvironment() (*Database, error) {
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const envNotSetMsg = "%v environment variable is not set"
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driver, prs := os.LookupEnv(EnvDatabaseDriver)
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if !prs {
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return nil, errors.Errorf(envNotSetMsg, EnvDatabaseDriver)
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}
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switch driver {
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case "sqlite":
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path, prs := os.LookupEnv(EnvDatabasePath)
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if !prs {
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return nil, errors.Errorf(envNotSetMsg, EnvDatabasePath)
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}
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db, err := gorm.Open(sqlite.Open(path), &gormConfig)
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if err != nil {
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return nil, err
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}
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return db, nil
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case "postgres":
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dsn, prs := os.LookupEnv(EnvPostgresURL)
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if !prs {
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return nil, errors.Errorf(envNotSetMsg, EnvPostgresURL)
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}
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db, err := gorm.Open(postgres.Open(dsn), &gormConfig)
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if err != nil {
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return nil, err
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}
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return db, nil
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default:
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return nil, errors.Errorf("RUSHLINK_DATABASE_DRIVER should be either 'sqlite' or 'postgres' (not '%v'), "+
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"for more info see <https://stackoverflow.com/q/3582552/5207081>", driver)
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}
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}
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