/
connection.go
126 lines (99 loc) · 2.3 KB
/
connection.go
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package registry
import (
"bytes"
"crypto/tls"
"encoding/binary"
"encoding/xml"
"github.com/pkg/errors"
"io"
"net"
"time"
)
const APIVersion = "1.0"
const APILanguage = "en"
func (s *Client) Connect() error {
dialConn, err := tls.Dial("tcp", s.registryServer, &s.tlsConfig)
if err != nil {
return err
}
s.conn = dialConn
greet, err := s.Read()
if err != nil {
return err
}
s.Greeting, err = unmarshalGreeting(greet)
if err != nil {
return err
}
if s.Greeting.SvcMenu.Version != APIVersion {
return errors.New("Unexpected version: " + s.Greeting.SvcMenu.Version)
}
return nil
}
func (s *Client) Read() ([]byte, error) {
var rawResponse int32
if s.readTimeout > 0 {
s.conn.SetReadDeadline(time.Now().Add(s.readTimeout))
}
err := binary.Read(s.conn, binary.BigEndian, &rawResponse)
if err != nil {
return nil, err
}
rawResponse -= 4
if rawResponse < 0 {
return nil, io.ErrUnexpectedEOF
}
bytesResponse, err := readStreamToBytes(s.conn, rawResponse)
if err != nil {
return nil, err
}
return bytesResponse, nil
}
func (s *Client) Write(payload []byte) error {
payload = []byte(xml.Header + string(payload))
sendBytesLength := uint32(4 + len(payload))
if s.writeTimeout > 0 {
s.conn.SetWriteDeadline(time.Now().Add(s.writeTimeout))
}
err := binary.Write(s.conn, binary.BigEndian, sendBytesLength)
if err != nil {
return err
}
if _, err = s.conn.Write(payload); err != nil {
return err
// TODO log first param (amount of bytes written) if error
}
return nil
}
func (s *Client) Send(payload []byte) ([]byte, error) {
s.log.Debug("Sending message:\n" + string(payload))
err := s.Write(payload)
if err != nil {
// TODO log error
return nil, err
}
time.Sleep(s.sendWaitTime)
apiResp, err := s.Read()
if err != nil {
// TODO log error
return nil, err
}
s.log.Debug("Received response:\n" + string(apiResp))
return apiResp, nil
}
func (s *Client) Close() error {
if err := s.conn.Close(); err != nil {
return err
}
s.conn = nil
return nil
}
func readStreamToBytes(conn net.Conn, rawResponse int32) ([]byte, error) {
lr := io.LimitedReader{R: conn, N: int64(rawResponse)}
buf := new(bytes.Buffer)
if _, err := buf.ReadFrom(&lr); err != nil {
return nil, err
// TODO log first param (amount of bytes read) if error
}
return buf.Bytes(), nil
}