136 Zeilen
3.4 KiB
Go
136 Zeilen
3.4 KiB
Go
package db
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import (
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"context"
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"io/fs"
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"sync"
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"github.com/gin-gonic/gin"
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"github.com/jackc/pgx/v4"
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"github.com/jackc/pgx/v4/pgxpool"
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"github.com/jackc/tern/migrate"
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"github.com/phuslu/log"
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"go.sebtobie.de/httpserver/funcs"
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"go.sebtobie.de/httpserver/middleware"
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)
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// ContextKey is the key that is used in a gin.Context to get the Middleware
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const ContextKey string = "db"
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// ConnGet is an function that returns an connection instance.
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type ConnGet func(string) *pgxpool.Conn
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var _ ConnGet = NewMiddleware().GetConn
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var _ middleware.Middleware = &Middleware{}
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// Middleware return a handler that sets the db into the context of every request.
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// uri is an url in the form dbtype:connectargs
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type Middleware struct {
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databases map[string]*pgxpool.Pool
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lock sync.Mutex
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}
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//NewMiddleware return an initialized Middleware Object.
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func NewMiddleware() *Middleware {
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return &Middleware{
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databases: make(map[string]*pgxpool.Pool),
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}
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}
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// AddDB adds an db connection to the middleware.
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func (m *Middleware) AddDB(name, uri string) (err error) {
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m.lock.Lock()
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if m.databases == nil {
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m.databases = map[string]*pgxpool.Pool{}
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}
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m.lock.Unlock()
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var (
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db *pgxpool.Pool
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connobject *pgxpool.Config
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)
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if err != nil {
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log.Error().Err(err).Msg("Could not open the database")
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return err
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}
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connobject, err = pgxpool.ParseConfig(uri)
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if err != nil {
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log.Error().Err(err).Msg("Could not open the database")
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return err
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}
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connobject.ConnConfig.Logger = funcs.PGXLogger{}
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db, err = pgxpool.ConnectConfig(context.TODO(), connobject)
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if err != nil {
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log.Error().Err(err).Msg("Could not open the database")
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return err
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}
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m.lock.Lock()
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defer m.lock.Unlock()
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if olddb, found := m.databases[name]; found {
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olddb.Close()
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}
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m.databases[name] = db
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return
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}
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func (m *Middleware) getconn(name string) *pgxpool.Conn {
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if db, found := m.databases[name]; found {
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conn, err := db.Acquire(context.TODO())
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if err != nil {
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log.Error().Err(err).Msgf("Could not get the connection from the pool %s", name)
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return nil
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}
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return conn
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}
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return nil
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}
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// GetConn returns a connection from the specified database or if not found one of the default database.
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func (m *Middleware) GetConn(name string) *pgxpool.Conn {
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m.lock.Lock()
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defer m.lock.Unlock()
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if conn := m.getconn(name); conn != nil {
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return conn
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}
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conn := m.getconn("default")
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return conn
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}
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// Gin is the Entrypoint for Gin.
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func (m *Middleware) Gin(c *gin.Context) {
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c.Set(ContextKey, m.GetConn)
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}
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// Teardown closes the DBConnection
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func (m *Middleware) Teardown() {
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for name, pool := range m.databases {
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log.Info().Msgf("Starting to close databasepool %s", name)
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pool.Close()
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log.Info().Msgf("Closed Databasepool %s", name)
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}
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}
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func logmigrations(version int32, name string, dir string, sql string) {
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sql = ""
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log.Info().Int32("version", version).Str("name", name).Str("dir", dir).Msgf("Running Migration %s with version %d in %sward direction", name, version, dir)
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}
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// SetupMigrator sets up the migrator to migrate the database.
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func SetupMigrator(prefix string, connection *pgx.Conn, migrations fs.FS) (mig *migrate.Migrator, err error) {
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mig, err = migrate.NewMigratorEx(
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context.TODO(),
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connection,
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"version",
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&migrate.MigratorOptions{
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DisableTx: false,
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MigratorFS: &iofsMigratorFS{fsys: migrations},
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},
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)
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if err != nil {
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log.Error().Err(err).Msg("Error while creating the migrator")
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return
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}
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mig.OnStart = logmigrations
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mig.Data["prefix"] = prefix
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return
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}
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