110 lines
2.7 KiB
Go
110 lines
2.7 KiB
Go
package db
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import (
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"database/sql"
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"errors"
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"fmt"
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"net/url"
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"github.com/go-gorp/gorp"
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"github.com/coreos/dex/repo"
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)
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type table struct {
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name string
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model interface{}
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autoinc bool
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pkey []string
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// unique are non-primary key fields which should have uniqueness constraints.
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unique []string
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}
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var (
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tables []table
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)
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func register(t table) {
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tables = append(tables, t)
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}
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type Config struct {
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// Connection string in the format: <driver>://<username>:<password>@<host>:<port>/<database>
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DSN string
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// The maximum number of open connections to the database. The default is 0 (unlimited).
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// For more details see: http://golang.org/pkg/database/sql/#DB.SetMaxOpenConns
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MaxOpenConnections int
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// The maximum number of connections in the idle connection pool. The default is 0 (unlimited).
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// For more details see: http://golang.org/pkg/database/sql/#DB.SetMaxIdleConns
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MaxIdleConnections int
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}
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func NewConnection(cfg Config) (*gorp.DbMap, error) {
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u, err := url.Parse(cfg.DSN)
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if err != nil {
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return nil, fmt.Errorf("parse DSN: %v", err)
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}
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var (
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db *sql.DB
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dialect gorp.Dialect
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)
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switch u.Scheme {
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case "postgres":
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db, err = sql.Open("postgres", cfg.DSN)
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if err != nil {
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return nil, err
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}
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db.SetMaxIdleConns(cfg.MaxIdleConnections)
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db.SetMaxOpenConns(cfg.MaxOpenConnections)
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dialect = gorp.PostgresDialect{}
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case "sqlite3":
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db, err = sql.Open("sqlite3", u.Host)
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if err != nil {
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return nil, err
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}
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if u.Host == ":memory:" {
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// NOTE(ericchiang): sqlite3 coordinates concurrent clients through file locks.
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// In memory databases do not support concurrent calls. Limit the number of
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// open connections to 1.
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//
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// See: https://www.sqlite.org/faq.html#q5
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db.SetMaxOpenConns(1)
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}
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dialect = gorp.SqliteDialect{}
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default:
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return nil, errors.New("unrecognized database driver")
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}
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dbm := gorp.DbMap{Db: db, Dialect: dialect}
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for _, t := range tables {
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tm := dbm.AddTableWithName(t.model, t.name).SetKeys(t.autoinc, t.pkey...)
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for _, unique := range t.unique {
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cm := tm.ColMap(unique)
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if cm == nil {
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return nil, fmt.Errorf("no such column: %q", unique)
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}
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cm.SetUnique(true)
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}
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}
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return &dbm, nil
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}
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func TransactionFactory(conn *gorp.DbMap) repo.TransactionFactory {
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return func() (repo.Transaction, error) {
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return conn.Begin()
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}
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}
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// NewMemDB creates a new in memory sqlite3 database.
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func NewMemDB() *gorp.DbMap {
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dbMap, err := NewConnection(Config{DSN: "sqlite3://:memory:"})
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if err != nil {
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panic("Failed to create in memory database: " + err.Error())
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}
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if _, err := MigrateToLatest(dbMap); err != nil {
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panic("In memory database migration failed: " + err.Error())
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}
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return dbMap
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}
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