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52 lines
1.1 KiB
Go
52 lines
1.1 KiB
Go
package tcp
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import (
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"crypto/tls"
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"fmt"
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"net"
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"time"
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)
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// NewDialer returns an initialized Dialer.
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func NewDialer(header byte, tlsConfig *tls.Config) *Dialer {
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return &Dialer{
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header: header,
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tlsConfig: tlsConfig,
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}
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}
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// Dialer supports dialing a cluster service.
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type Dialer struct {
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header byte
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tlsConfig *tls.Config
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}
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// Dial dials the cluster service at the given addr and returns a connection.
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func (d *Dialer) Dial(addr string, timeout time.Duration) (conn net.Conn, retErr error) {
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dialer := &net.Dialer{Timeout: timeout}
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if d.tlsConfig == nil {
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conn, retErr = dialer.Dial("tcp", addr)
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} else {
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conn, retErr = tls.DialWithDialer(dialer, "tcp", addr, d.tlsConfig)
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}
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if retErr != nil {
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return nil, retErr
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}
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defer func() {
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if retErr != nil && conn != nil {
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conn.Close()
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}
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}()
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// Write a marker byte to indicate message type.
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if err := conn.SetWriteDeadline(time.Now().Add(timeout)); err != nil {
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return nil, fmt.Errorf("failed to set WriteDeadline for header: %s", err.Error())
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}
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if _, err := conn.Write([]byte{d.header}); err != nil {
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return nil, err
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}
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return conn, nil
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}
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