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db.go
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db.go
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package serv
import (
"crypto/tls"
"crypto/x509"
"database/sql"
"errors"
"fmt"
"io/ioutil"
"strings"
"time"
"contrib.go.opencensus.io/integrations/ocsql"
"github.com/jackc/pgx/v4"
"github.com/jackc/pgx/v4/stdlib"
)
const (
pemSig = "--BEGIN "
)
const (
logLevelNone int = iota
logLevelInfo
logLevelWarn
logLevelError
logLevelDebug
)
type dbConf struct {
driverName string
connString string
}
func (s *Service) NewDB(useDB bool) (*sql.DB, error) {
return s.newDB(useDB, false)
}
func (s *Service) newDB(useDB, useTelemetry bool) (*sql.DB, error) {
var db *sql.DB
var dc *dbConf
var err error
switch s.conf.DBType {
case "mysql":
dc, err = initMysql(s.conf, useDB, useTelemetry)
default:
dc, err = initPostgres(s.conf, useDB, useTelemetry)
}
if useTelemetry && s.conf.telemetryEnabled() {
dc.driverName, err = s.initTelemetry(dc.driverName)
if err != nil {
return nil, err
}
var interval time.Duration
if s.conf.Telemetry.Interval != nil {
interval = *s.conf.Telemetry.Interval
} else {
interval = 5 * time.Second
}
defer ocsql.RecordStats(db, interval)()
}
for i := 1; i < 10; i++ {
if db, err = sql.Open(dc.driverName, dc.connString); err == nil {
break
}
time.Sleep(time.Duration(i*100) * time.Millisecond)
}
if err != nil {
return nil, fmt.Errorf("unable to open db connection: %v", err)
}
db.SetMaxIdleConns(100)
return db, nil
}
func (s *Service) initTelemetry(driverName string) (string, error) {
var err error
var opts ocsql.TraceOptions
if s.conf.Serv.Telemetry.Tracing.ExcludeHealthCheck {
opts = ocsql.TraceOptions{
AllowRoot: true,
Ping: false,
RowsNext: true,
RowsClose: true,
RowsAffected: true,
LastInsertID: true,
Query: s.conf.Telemetry.Tracing.IncludeQuery,
QueryParams: s.conf.Telemetry.Tracing.IncludeParams,
}
} else {
opts = ocsql.TraceOptions{
AllowRoot: true,
Ping: true,
RowsNext: true,
RowsClose: true,
RowsAffected: true,
LastInsertID: true,
Query: s.conf.Telemetry.Tracing.IncludeQuery,
QueryParams: s.conf.Telemetry.Tracing.IncludeParams,
}
}
opt := ocsql.WithOptions(opts)
name := ocsql.WithInstanceName(s.conf.AppName)
driverName, err = ocsql.Register(driverName, opt, name)
if err != nil {
return "", fmt.Errorf("unable to register ocsql driver: %v", err)
}
ocsql.RegisterAllViews()
s.log.Infof("OpenCensus telemetry enabled")
return driverName, nil
}
func initPostgres(c *Config, useDB, useTelemetry bool) (*dbConf, error) {
config, _ := pgx.ParseConfig("")
config.Host = c.DB.Host
config.Port = c.DB.Port
config.User = c.DB.User
config.Password = c.DB.Password
config.RuntimeParams = map[string]string{
"application_name": c.AppName,
"search_path": c.DB.Schema,
}
if useDB {
config.Database = c.DB.DBName
}
if c.DB.EnableTLS {
if len(c.DB.ServerName) == 0 {
return nil, errors.New("server_name is required")
}
if len(c.DB.ServerCert) == 0 {
return nil, errors.New("server_cert is required")
}
if len(c.DB.ClientCert) == 0 {
return nil, errors.New("client_cert is required")
}
if len(c.DB.ClientKey) == 0 {
return nil, errors.New("client_key is required")
}
rootCertPool := x509.NewCertPool()
var pem []byte
var err error
if strings.Contains(c.DB.ServerCert, pemSig) {
pem = []byte(c.DB.ServerCert)
} else {
pem, err = ioutil.ReadFile(c.RelPath(c.DB.ServerCert))
}
if err != nil {
return nil, fmt.Errorf("db tls: %w", err)
}
if ok := rootCertPool.AppendCertsFromPEM(pem); !ok {
return nil, errors.New("db tls: failed to append pem")
}
clientCert := make([]tls.Certificate, 0, 1)
var certs tls.Certificate
if strings.Contains(c.DB.ClientCert, pemSig) {
certs, err = tls.X509KeyPair([]byte(c.DB.ClientCert), []byte(c.DB.ClientKey))
} else {
certs, err = tls.LoadX509KeyPair(c.RelPath(c.DB.ClientCert), c.RelPath(c.DB.ClientKey))
}
if err != nil {
return nil, fmt.Errorf("db tls: %w", err)
}
clientCert = append(clientCert, certs)
config.TLSConfig = &tls.Config{
RootCAs: rootCertPool,
Certificates: clientCert,
ServerName: c.DB.ServerName,
}
}
// switch c.LogLevel {
// case "debug":
// config.LogLevel = pgx.LogLevelDebug
// case "info":
// config.LogLevel = pgx.LogLevelInfo
// case "warn":
// config.LogLevel = pgx.LogLevelWarn
// case "error":
// config.LogLevel = pgx.LogLevelError
// default:
// config.LogLevel = pgx.LogLevelNone
// }
//config.Logger = NewSQLLogger(logger)
// if c.DB.MaxRetries != 0 {
// opt.MaxRetries = c.DB.MaxRetries
// }
// if c.DB.PoolSize != 0 {
// config.MaxConns = conf.DB.PoolSize
// }
return &dbConf{"pgx", stdlib.RegisterConnConfig(config)}, nil
}
func initMysql(c *Config, useDB, useTelemetry bool) (*dbConf, error) {
connString := fmt.Sprintf("%s:%s@tcp(%s:%d)/", c.DB.User, c.DB.Password, c.DB.Host, c.DB.Port)
if useDB {
connString += c.DB.DBName
}
return &dbConf{"mysql", connString}, nil
}