Golang DSN.DSN方法代码示例

func (i *Installer) createMySQLInstance(dsn mysql.DSN) (*proto.MySQLInstance, error) {
	// First use instance.Manager to fill in details about the MySQL server.
	dsnString, _ := dsn.DSN()
	mi := &proto.MySQLInstance{
		Hostname: i.hostname,
		DSN:      dsnString,
	}
	if err := instance.GetMySQLInfo(mi); err != nil {
		if i.flags["debug"] {
			log.Printf("err=%s\n", err)
		}
		return nil, err
	}

	// POST <api>/instances/mysql
	data, err := json.Marshal(mi)
	if err != nil {
		return nil, err
	}
	url := pct.URL(i.agentConfig.ApiHostname, "instances", "mysql")
	if i.flags["debug"] {
		log.Println(url)
	}
	resp, _, err := i.api.Post(i.agentConfig.ApiKey, url, data)
	if i.flags["debug"] {
		log.Printf("resp=%#v\n", resp)
		log.Printf("err=%s\n", err)
	}
	if err != nil {
		return nil, err
	}
	// Create new instance, if it already exist then just use it
	// todo: better handling of duplicate instance
	if resp.StatusCode != http.StatusCreated && resp.StatusCode != http.StatusConflict {
		return nil, fmt.Errorf("Failed to create MySQL instance (status code %d)", resp.StatusCode)
	}

	// API returns URI of new resource in Location header
	uri := resp.Header.Get("Location")
	if uri == "" {
		return nil, fmt.Errorf("API did not return location of new MySQL instance")
	}

	// GET <api>/instances/mysql/id (URI)
	code, data, err := i.api.Get(i.agentConfig.ApiKey, uri)
	if i.flags["debug"] {
		log.Printf("code=%d\n", code)
		log.Printf("err=%s\n", err)
	}
	if err != nil {
		return nil, err
	}
	if code != http.StatusOK {
		return nil, fmt.Errorf("Failed to get new MySQL instance (status code %d)", code)
	}
	if err := json.Unmarshal(data, mi); err != nil {
		return nil, err
	}
	return mi, nil
}

func TestMySQLConnection(dsn mysql.DSN) error {
	dsnString, err := dsn.DSN()
	if err != nil {
		return err
	}

	fmt.Printf("Testing MySQL connection %s...\n", dsn)
	conn := mysql.NewConnection(dsnString)
	if err := conn.Connect(1); err != nil {
		return err
	}
	defer conn.Close()
	return nil
}

func (i *Installer) verifyMySQLConnection(dsn mysql.DSN) (err error) {
	dsnString, err := dsn.DSN()
	if err != nil {
		return err
	}
	if i.flags.Bool["debug"] {
		log.Printf("verifyMySQLConnection: %#v %s\n", dsn, dsnString)
	}
	conn := mysql.NewConnection(dsnString)
	if err := conn.Connect(1); err != nil {
		return err
	}
	conn.Close()
	return nil
}

func (s *DSNTestSuite) TestAllFields(t *C) {
	dsn := mysql.DSN{
		Username: "user",
		Password: "pass",
		Hostname: "host.example.com",
		Port:     "3306",
	}
	str, err := dsn.DSN()
	t.Check(err, IsNil)
	t.Check(str, Equals, "user:[email protected](host.example.com:3306)/?parseTime=true")

	// Stringify DSN removes password, e.g. makes it safe to print log, etc.
	str = fmt.Sprintf("%s", dsn)
	t.Check(str, Equals, "user:<password-hidden>@tcp(host.example.com:3306)")
}

func (i *Installer) createMySQLUser(dsn mysql.DSN) (mysql.DSN, error) {
	// Same host:port or socket, but different user and pass.
	userDSN := dsn
	userDSN.Username = "percona-agent"
	userDSN.Password = fmt.Sprintf("%p%d", &dsn, rand.Uint32())
	userDSN.OldPasswords = i.flags.Bool["old-passwords"]

	dsnString, _ := dsn.DSN()
	conn := mysql.NewConnection(dsnString)
	if err := conn.Connect(1); err != nil {
		return userDSN, err
	}
	defer conn.Close()
	grants := MakeGrant(dsn, userDSN.Username, userDSN.Password, i.flags.Int64["mysql-max-user-connections"])
	for _, grant := range grants {
		if i.flags.Bool["debug"] {
			log.Println(grant)
		}
		_, err := conn.DB().Exec(grant)
		if err != nil {
			return userDSN, fmt.Errorf("Error executing %s: %s", grant, err)
		}
	}

	// Go MySQL driver resolves localhost to 127.0.0.1 but localhost is a special
	// value for MySQL, so 127.0.0.1 may not work with a grant @localhost, so we
	// add a 2nd grant @127.0.0.1 to be sure.
	if dsn.Hostname == "localhost" {
		dsn2 := dsn
		dsn2.Hostname = "127.0.0.1"
		grants := MakeGrant(dsn2, userDSN.Username, userDSN.Password, i.flags.Int64["mysql-max-user-connections"])
		for _, grant := range grants {
			if i.flags.Bool["debug"] {
				log.Println(grant)
			}
			_, err := conn.DB().Exec(grant)
			if err != nil {
				return userDSN, fmt.Errorf("Error executing %s: %s", grant, err)
			}
		}
	}

	return userDSN, nil
}