forked from jcelliott/turnpike
/
client.go
206 lines (179 loc) · 4.73 KB
/
client.go
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package turnpike
import (
"code.google.com/p/go.net/websocket"
"encoding/json"
"fmt"
log "github.com/jcelliott/lumber"
"io"
)
func init() {
log.Level(log.TRACE)
}
const (
WAMP_SUBPROTOCOL_ID = "wamp"
)
var clientBacklog = 10
type Client struct {
ws *websocket.Conn
messages chan string
prefixes PrefixMap
SessionId string
ProtocolVersion int
ServerIdent string
}
func NewClient() *Client {
return &Client{
messages: make(chan string, clientBacklog),
prefixes: make(PrefixMap),
}
}
func (c *Client) Prefix(prefix, URI string) error {
log.Trace("sending prefix")
err := c.prefixes.RegisterPrefix(prefix, URI)
if err != nil {
return fmt.Errorf("turnpike: %s", err)
}
msg, err := CreatePrefix(prefix, URI)
if err != nil {
return fmt.Errorf("turnpike: %s", err)
}
c.messages <- string(msg)
return nil
}
func (c *Client) Call(callID, procURI string, args ...interface{}) error {
log.Trace("sending call")
msg, err := CreateCall(callID, procURI, args...)
if err != nil {
return fmt.Errorf("turnpike: %s", err)
}
c.messages <- string(msg)
return nil
}
func (c *Client) Subscribe(topicURI string) error {
log.Trace("sending subscribe")
msg, err := CreateSubscribe(topicURI)
if err != nil {
return fmt.Errorf("turnpike: %s", err)
}
c.messages <- string(msg)
return nil
}
func (c *Client) Unsubscribe(topicURI string) error {
log.Trace("sending unsubscribe")
msg, err := CreateUnsubscribe(topicURI)
if err != nil {
return fmt.Errorf("turnpike: %s", err)
}
c.messages <- string(msg)
return nil
}
func (c *Client) Publish(topicURI string, event interface{}, opts ...interface{}) error {
log.Trace("sending publish)")
msg, err := CreatePublish(topicURI, event, opts...)
if err != nil {
return fmt.Errorf("turnpike: %s", err)
}
c.messages <- string(msg)
return nil
}
func (c *Client) PublishExcludeMe(topicURI string, event interface{}) error {
return c.Publish(topicURI, event, true)
}
func (c *Client) handleCallResult(msg CallResultMsg) {
log.Trace("Handling call result message")
}
func (c *Client) handleCallError(msg CallErrorMsg) {
log.Trace("Handling call error message")
}
func (c *Client) handleEvent(msg EventMsg) {
log.Trace("Handling event message")
}
func (c *Client) ReceiveWelcome() error {
log.Trace("Receive welcome")
var rec string
err := websocket.Message.Receive(c.ws, &rec)
if err != nil {
return fmt.Errorf("Error receiving welcome message: %s", err)
}
if typ := ParseType(rec); typ != WELCOME {
return fmt.Errorf("First message received was not welcome")
}
var msg WelcomeMsg
err = json.Unmarshal([]byte(rec), &msg)
if err != nil {
return fmt.Errorf("Error unmarshalling welcome message: %s", err)
}
c.SessionId = msg.SessionId
log.Debug("Session id: %s", c.SessionId)
c.ProtocolVersion = msg.ProtocolVersion
log.Debug("Protocol version: %d", c.ProtocolVersion)
c.ServerIdent = msg.ServerIdent
log.Debug("Server ident: %s", c.ServerIdent)
return nil
}
func (c *Client) Listen() {
for {
var rec string
err := websocket.Message.Receive(c.ws, &rec)
if err != nil {
if err != io.EOF {
log.Error("Error receiving message, aborting connection: %s", err)
}
break
}
log.Trace("Message received: %s", rec)
data := []byte(rec)
switch typ := ParseType(rec); typ {
case CALLRESULT:
var msg CallResultMsg
err := json.Unmarshal(data, &msg)
if err != nil {
log.Error("Error unmarshalling call result message: %s", err)
}
c.handleCallResult(msg)
case CALLERROR:
var msg CallErrorMsg
err := json.Unmarshal(data, &msg)
if err != nil {
log.Error("Error unmarshalling call error message: %s", err)
}
c.handleCallError(msg)
case EVENT:
var msg EventMsg
err := json.Unmarshal(data, &msg)
if err != nil {
log.Error("Error unmarshalling event message: %s", err)
}
c.handleEvent(msg)
case PREFIX, CALL, SUBSCRIBE, UNSUBSCRIBE, PUBLISH:
log.Error("Client -> server message received, ignored: %s", TypeString(typ))
case WELCOME:
log.Error("Received extraneous welcome message, ignored")
default:
log.Error("Invalid message format, message dropped: %s", data)
}
}
}
func (c *Client) Send() {
for msg := range c.messages {
log.Trace("Sending message: %s", msg)
if err := websocket.Message.Send(c.ws, msg); err != nil {
log.Error("Error sending message: %s", err)
}
}
}
func (c *Client) Connect(server, origin string) error {
log.Trace("connect")
var err error
if c.ws, err = websocket.Dial(server, WAMP_SUBPROTOCOL_ID, origin); err != nil {
return fmt.Errorf("Error connecting to websocket server: %s", err)
}
// Receive welcome message
if err = c.ReceiveWelcome(); err != nil {
return err
}
log.Info("Connected to server: %s", server)
go c.Listen()
go c.Send()
return nil
}