3f44e04365
* Set transaction isolation in connections * Revert load_map.go change * Var rename * Restore comment
137 lines
3.5 KiB
Go
137 lines
3.5 KiB
Go
/*
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Copyright 2022 GitHub Inc.
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See https://github.com/github/gh-ost/blob/master/LICENSE
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*/
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package mysql
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import (
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"crypto/tls"
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"crypto/x509"
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"errors"
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"fmt"
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"io/ioutil"
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"net"
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"strings"
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"github.com/go-sql-driver/mysql"
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)
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const (
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transactionIsolation = "REPEATABLE-READ"
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TLS_CONFIG_KEY = "ghost"
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)
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// ConnectionConfig is the minimal configuration required to connect to a MySQL server
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type ConnectionConfig struct {
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Key InstanceKey
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User string
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Password string
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ImpliedKey *InstanceKey
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tlsConfig *tls.Config
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Timeout float64
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}
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func NewConnectionConfig() *ConnectionConfig {
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config := &ConnectionConfig{
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Key: InstanceKey{},
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}
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config.ImpliedKey = &config.Key
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return config
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}
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// DuplicateCredentials creates a new connection config with given key and with same credentials as this config
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func (this *ConnectionConfig) DuplicateCredentials(key InstanceKey) *ConnectionConfig {
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config := &ConnectionConfig{
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Key: key,
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User: this.User,
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Password: this.Password,
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tlsConfig: this.tlsConfig,
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Timeout: this.Timeout,
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}
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config.ImpliedKey = &config.Key
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return config
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}
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func (this *ConnectionConfig) Duplicate() *ConnectionConfig {
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return this.DuplicateCredentials(this.Key)
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}
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func (this *ConnectionConfig) String() string {
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return fmt.Sprintf("%s, user=%s, usingTLS=%t", this.Key.DisplayString(), this.User, this.tlsConfig != nil)
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}
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func (this *ConnectionConfig) Equals(other *ConnectionConfig) bool {
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return this.Key.Equals(&other.Key) || this.ImpliedKey.Equals(other.ImpliedKey)
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}
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func (this *ConnectionConfig) UseTLS(caCertificatePath, clientCertificate, clientKey string, allowInsecure bool) error {
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var rootCertPool *x509.CertPool
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var certs []tls.Certificate
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var err error
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if caCertificatePath == "" {
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rootCertPool, err = x509.SystemCertPool()
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if err != nil {
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return err
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}
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} else {
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rootCertPool = x509.NewCertPool()
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pem, err := ioutil.ReadFile(caCertificatePath)
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if err != nil {
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return err
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}
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if ok := rootCertPool.AppendCertsFromPEM(pem); !ok {
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return errors.New("could not add ca certificate to cert pool")
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}
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}
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if clientCertificate != "" || clientKey != "" {
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cert, err := tls.LoadX509KeyPair(clientCertificate, clientKey)
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if err != nil {
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return err
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}
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certs = []tls.Certificate{cert}
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}
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this.tlsConfig = &tls.Config{
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ServerName: this.Key.Hostname,
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Certificates: certs,
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RootCAs: rootCertPool,
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InsecureSkipVerify: allowInsecure,
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}
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return mysql.RegisterTLSConfig(TLS_CONFIG_KEY, this.tlsConfig)
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}
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func (this *ConnectionConfig) TLSConfig() *tls.Config {
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return this.tlsConfig
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}
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func (this *ConnectionConfig) GetDBUri(databaseName string) string {
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hostname := this.Key.Hostname
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var ip = net.ParseIP(hostname)
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if (ip != nil) && (ip.To4() == nil) {
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// Wrap IPv6 literals in square brackets
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hostname = fmt.Sprintf("[%s]", hostname)
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}
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// go-mysql-driver defaults to false if tls param is not provided; explicitly setting here to
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// simplify construction of the DSN below.
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tlsOption := "false"
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if this.tlsConfig != nil {
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tlsOption = TLS_CONFIG_KEY
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}
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connectionParams := []string{
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"autocommit=true",
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"charset=utf8mb4,utf8,latin1",
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"interpolateParams=true",
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fmt.Sprintf("tls=%s", tlsOption),
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fmt.Sprintf("transaction_isolation=%q", transactionIsolation),
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fmt.Sprintf("timeout=%fs", this.Timeout),
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fmt.Sprintf("readTimeout=%fs", this.Timeout),
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fmt.Sprintf("writeTimeout=%fs", this.Timeout),
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}
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return fmt.Sprintf("%s:%s@tcp(%s:%d)/%s?%s", this.User, this.Password, hostname, this.Key.Port, databaseName, strings.Join(connectionParams, "&"))
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}
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