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package database
import (
"context"
"database/sql"
"fmt"
"sync"
"time"
"github.com/go-gorp/gorp"
"github.com/lib/pq"
"github.com/rockbears/log"
"github.com/ovh/cds/engine/gorpmapper"
"github.com/ovh/cds/sdk"
)
// DBConnectionFactory is a database connection factory on postgres with gorp
type DBConnectionFactory struct {
DBRole string
DBUser string
DBPassword string
DBName string
DBSchema string
DBHost string
DBPort int
DBSSLMode string
DBTimeout int
DBConnectTimeout int
DBMaxConn int
Database *sql.DB
mutex *sync.Mutex
}
// DB returns the current sql.DB object
func (f *DBConnectionFactory) DB() *sql.DB {
if f.Database == nil {
if f.DBName == "" {
return nil
}
newF, err := Init(context.TODO(), f.DBUser, f.DBRole, f.DBPassword, f.DBName, f.DBSchema, f.DBHost, f.DBPort, f.DBSSLMode, f.DBConnectTimeout, f.DBTimeout, f.DBMaxConn)
if err != nil {
err = sdk.WithStack(err)
ctx := sdk.ContextWithStacktrace(context.TODO(), err)
log.Error(ctx, "unable to init db connection: %v", err)
return nil
}
*f = *newF
}
if err := f.Database.Ping(); err != nil {
log.Error(context.TODO(), "Database> cannot ping db : %s", err)
f.Database = nil
return nil
}
return f.Database
}
// GetDBMap returns a gorp.DbMap pointer
func (f *DBConnectionFactory) GetDBMap(m *gorpmapper.Mapper) func() *gorp.DbMap {
return func() *gorp.DbMap {
return DBMap(m, f.DB())
}
}
//Set is for tetsing purpose, we need to set manually the connection
func (f *DBConnectionFactory) Set(d *sql.DB) {
f.Database = d
}
// Init initialize sql.DB object by checking environment variables and connecting to database
func Init(ctx context.Context, user, role, password, name, schema, host string, port int, sslmode string, connectTimeout, timeout, maxconn int) (*DBConnectionFactory, error) {
if schema == "" {
schema = "public"
}
f := &DBConnectionFactory{
DBRole: role,
DBUser: user,
DBPassword: password,
DBName: name,
DBSchema: schema,
DBHost: host,
DBPort: port,
DBSSLMode: sslmode,
DBTimeout: timeout,
DBConnectTimeout: connectTimeout,
DBMaxConn: maxconn,
mutex: &sync.Mutex{},
}
f.mutex.Lock()
defer f.mutex.Unlock()
// Try to close before reinit
if f.Database != nil {
if err := f.Database.Close(); err != nil {
log.Error(ctx, "Cannot close connection to DB : %s", err)
}
}
var err error
if f.DBUser == "" ||
f.DBPassword == "" ||
f.DBName == "" ||
f.DBHost == "" ||
f.DBPort == 0 {
return nil, fmt.Errorf("Missing database infos")
}
if f.DBTimeout < 200 || f.DBTimeout > 30000 {
f.DBTimeout = 3000
}
if f.DBConnectTimeout <= 0 {
f.DBConnectTimeout = 10
}
// connect_timeout in seconds
// statement_timeout in milliseconds
dsn := f.dsn()
connector, err := pq.NewConnector(dsn)
if err != nil {
log.Error(ctx, "cannot open database: %s", err)
return nil, sdk.WithStack(err)
}
f.Database = sql.OpenDB(connector)
if err != nil {
f.Database = nil
log.Error(ctx, "cannot open database: %s", err)
return nil, err
}
if err = f.Database.Ping(); err != nil {
f.Database = nil
return nil, err
}
f.Database.SetMaxOpenConns(f.DBMaxConn)
f.Database.SetMaxIdleConns(int(f.DBMaxConn / 2))
if _, err := f.Database.Exec(fmt.Sprintf("SET statement_timeout = %d", f.DBTimeout)); err != nil {
log.Error(ctx, "unable to set statement_timeout with %d on database: %s", f.DBTimeout, err)
return nil, sdk.WrapError(err, "unable to set statement_timeout with %d", f.DBTimeout)
}
// Set role if specified
if role != "" {
log.Debug(ctx, "database> setting role %s on database", role)
if _, err := f.Database.Exec("SET ROLE '" + role + "'"); err != nil {
log.Error(ctx, "unable to set role %s on database: %v", role, err)
return nil, sdk.WrapError(err, "unable to set role %s", role)
}
}
return f, nil
}
func (f *DBConnectionFactory) dsn() string {
dsn := fmt.Sprintf("user=%s password='%s' dbname=%s host=%s port=%d sslmode=%s connect_timeout=%d", f.DBUser, f.DBPassword, f.DBName, f.DBHost, f.DBPort, f.DBSSLMode, f.DBConnectTimeout)
if f.DBSchema != "public" {
dsn += fmt.Sprintf(" search_path=%s", f.DBSchema)
}
return dsn
}
// Status returns database driver and status in a printable string
func (f *DBConnectionFactory) Status(ctx context.Context) sdk.MonitoringStatusLine {
if f.Database == nil {
return sdk.MonitoringStatusLine{Component: "Database Conns", Value: "No Connection", Status: sdk.MonitoringStatusAlert}
}
if err := f.Database.Ping(); err != nil {
return sdk.MonitoringStatusLine{Component: "Database Conns", Value: "No Ping", Status: sdk.MonitoringStatusAlert}
}
return sdk.MonitoringStatusLine{Component: "Database Conns", Value: fmt.Sprintf("%d", f.Database.Stats().OpenConnections), Status: sdk.MonitoringStatusOK}
}
// Close closes the database, releasing any open resources.
func (f *DBConnectionFactory) Close() error {
if f.Database != nil {
return f.Database.Close()
}
return nil
}
// NewListener creates a new database connection dedicated to LISTEN / NOTIFY.
func (f *DBConnectionFactory) NewListener(minReconnectInterval time.Duration, maxReconnectInterval time.Duration, eventCallback pq.EventCallbackType) *pq.Listener {
return pq.NewListener(f.dsn(), minReconnectInterval, maxReconnectInterval, eventCallback)
}