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transport_websocket_client.go
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transport_websocket_client.go
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package irt
import (
"crypto/tls"
"fmt"
"time"
"github.com/gorilla/websocket"
)
type wsClientTransport struct {
// Implements ClientTransport
endpoint string
dialer *websocket.Dialer
conn *websocket.Conn
logger Logger
marshaller Marshaller
headers TransportHeaders
auth *Authorization
}
func NewWebSocketClientTransportEx(endpoint string, timeout time.Duration, skipSSLVerify bool, subprotocols []string,
enableCompression bool, marshaller Marshaller, logger Logger) (ClientTransport, error) {
client := &wsClientTransport{
logger: logger,
marshaller: marshaller,
endpoint: endpoint,
headers: map[string]string{},
dialer: &websocket.Dialer{
TLSClientConfig: &tls.Config{InsecureSkipVerify: skipSSLVerify},
Subprotocols: subprotocols,
HandshakeTimeout: timeout,
EnableCompression: enableCompression,
ReadBufferSize: DefaultReadBufferSize,
WriteBufferSize: DefaultWriteBufferSize,
},
}
conn, _, err := client.dialer.Dial(client.endpoint, nil)
if err != nil {
return nil, err
}
client.conn = conn
return client, nil
}
func NewWebSocketClientTransport(endpoint string, subprotocols []string) (ClientTransport, error) {
return NewWebSocketClientTransportEx(endpoint, DefaultTimeout, false, subprotocols, true,
NewJSONMarshaller(false), NewDummyLogger())
}
func (t *wsClientTransport) requestResponse(req *WebSocketRequestMessage) (*WebSocketResponseMessage, error) {
reqData, err := t.marshaller.Marshal(req)
if err != nil {
t.logger.Logf(LogError, "Request message marshalling failed: %s", err.Error())
return nil, err
}
t.logger.Logf(LogTrace, "Request message:\n`%s`", string(reqData))
err = t.conn.WriteMessage(websocket.TextMessage, reqData)
if err != nil {
t.logger.Logf(LogError, "Request message sending failed: %s", err.Error())
return nil, err
}
t.conn.ReadMessage()
messageType, respData, err := t.conn.ReadMessage()
if err != nil {
t.logger.Logf(LogError, "Response message reading failed: %s", err.Error())
return nil, err
}
if messageType != websocket.TextMessage {
t.logger.Logf(LogError, "Response message type is not text. Got %+v", messageType)
return nil, err
}
t.logger.Logf(LogTrace, "Response message:\n`%s`", string(respData))
res := &WebSocketResponseMessage{}
err = t.marshaller.Unmarshal(respData, res)
if err != nil {
t.logger.Logf(LogError, "Response message unmarshalling failed: %s", err.Error())
return nil, err
}
if res.Ref != req.ID {
err := fmt.Errorf("response message reference doesn't match the request ID. Expected: %s got %s",
req.ID, res.Ref)
t.logger.Logf(LogError, err.Error())
return nil, err
}
return res, nil
}
func (t *wsClientTransport) GetHeaders() TransportHeaders {
return t.headers
}
func (t *wsClientTransport) SetHeaders(headers TransportHeaders) error {
t.headers = headers
return t.sendHeaders()
}
func (t *wsClientTransport) GetAuthorization() *Authorization {
return t.auth
}
func (t *wsClientTransport) SetAuthorization(auth *Authorization) error {
t.auth = auth
return t.sendHeaders()
}
func (t *wsClientTransport) sendHeaders() error {
req := &WebSocketRequestMessage{}
req.ID = RandomMessageID("updateheaders-")
req.Headers = map[string]string{}
if t.auth == nil {
req.Headers["Authorization"] = ""
} else {
req.Headers["Authorization"] = t.auth.ToValue()
}
for k, v := range t.headers {
req.Headers[k] = v
}
t.logger.Logf(LogDebug, "================================================")
t.logger.Logf(LogDebug, "Updating Authorization: %+v", req.Headers)
_, err := t.requestResponse(req)
if err != nil {
return err
}
t.logger.Logf(LogDebug, "================================================")
return nil
}
func (t *wsClientTransport) Send(service string, method string, dataIn interface{}, dataOut interface{}) error {
t.logger.Logf(LogDebug, "================================================")
t.logger.Logf(LogDebug, "Requesting Service: %s, Method: %s", service, method)
var data []byte
var err error
if dataIn != nil {
data, err = t.marshaller.Marshal(dataIn)
if err != nil {
t.logger.Logf(LogError, "Data in marshalling failed: %s", err.Error())
return err
}
}
req := &WebSocketRequestMessage{}
req.Service = service
req.Method = method
req.ID = RandomMessageID("")
req.Data = data
res, err := t.requestResponse(req)
if err != nil {
return err
}
if dataOut != nil {
if err = t.marshaller.Unmarshal(res.Data, dataOut); err != nil {
msg := fmt.Sprintf("error while unmarshalling response message %+v. Data: %s.", err, string(res.Data))
t.logger.Logf(LogError, msg)
return fmt.Errorf(msg)
}
}
t.logger.Logf(LogDebug, "================================================")
return nil
}