2017-07-13 12:01:28 +00:00
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package server
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import (
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2017-08-09 08:20:44 +00:00
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"context"
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2017-07-13 12:01:28 +00:00
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"encoding/json"
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"fmt"
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"io"
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"log"
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"net/http"
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2017-08-09 08:20:44 +00:00
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"strings"
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2017-07-13 12:01:28 +00:00
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"sync"
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"time"
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2017-08-09 08:20:44 +00:00
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serverGrpc "git.loafle.net/overflow/overflow_api_server/golang"
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2017-07-13 12:01:28 +00:00
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"github.com/gorilla/websocket"
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)
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type ClientStatus uint8
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const (
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CONNECTED ClientStatus = iota + 1
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DISCONNECTED
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)
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type (
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// OnDisconnectFunc is callback function that used when client is disconnected
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OnDisconnectFunc func(Client)
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// OnErrorFunc is callback function that used when error occurred
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OnErrorFunc func(error)
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)
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// Client is interface
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type Client interface {
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ID() string
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HTTPRequest() *http.Request
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Conn() Connection
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Disconnect() error
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OnDisconnect(OnDisconnectFunc)
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OnError(OnErrorFunc)
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initialize() error
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destroy() error
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}
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type client struct {
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id string
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status ClientStatus
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messageType int
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server Server
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httpRequest *http.Request
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conn Connection
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pingTicker *time.Ticker
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writeMTX sync.Mutex
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onDisconnectListeners []OnDisconnectFunc
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onErrorListeners []OnErrorFunc
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}
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var _ Client = &client{}
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func newClient(s Server, r *http.Request, conn Connection, clientID string) Client {
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c := &client{
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id: clientID,
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status: CONNECTED,
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messageType: websocket.TextMessage,
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server: s,
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httpRequest: r,
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conn: conn,
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onDisconnectListeners: make([]OnDisconnectFunc, 0),
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onErrorListeners: make([]OnErrorFunc, 0),
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}
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if s.GetOptions().BinaryMessage {
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c.messageType = websocket.BinaryMessage
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}
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return c
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}
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func (c *client) ID() string {
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return c.id
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}
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func (c *client) HTTPRequest() *http.Request {
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return c.httpRequest
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}
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func (c *client) Conn() Connection {
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return c.conn
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}
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func (c *client) Disconnect() error {
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return c.server.Disconnect(c.ID())
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}
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func (c *client) OnDisconnect(cb OnDisconnectFunc) {
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c.onDisconnectListeners = append(c.onDisconnectListeners, cb)
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}
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func (c *client) OnError(cb OnErrorFunc) {
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c.onErrorListeners = append(c.onErrorListeners, cb)
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}
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func (c *client) initialize() error {
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c.status = CONNECTED
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c.startPing()
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c.startReading()
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return nil
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}
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func (c *client) destroy() error {
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c.status = DISCONNECTED
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c.pingTicker.Stop()
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for _, cb := range c.onDisconnectListeners {
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cb(c)
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}
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return c.conn.Close()
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}
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func (c *client) startPing() {
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c.pingTicker = time.NewTicker(c.server.GetOptions().PingPeriod)
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go func() {
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for {
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<-c.pingTicker.C
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if err := c.conn.WriteControl(websocket.PingMessage, []byte{}, time.Now().Add(c.server.GetOptions().PingTimeout)); err != nil {
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log.Println("ping:", err)
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}
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}
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}()
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}
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func (c *client) startReading() {
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hasReadTimeout := c.server.GetOptions().ReadTimeout > 0
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c.conn.SetReadLimit(c.server.GetOptions().MaxMessageSize)
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c.conn.SetPongHandler(func(message string) error {
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if hasReadTimeout {
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c.conn.SetReadDeadline(time.Now().Add(c.server.GetOptions().PongTimeout))
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}
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return nil
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})
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defer func() {
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c.Disconnect()
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}()
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for {
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if hasReadTimeout {
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c.conn.SetReadDeadline(time.Now().Add(c.server.GetOptions().ReadTimeout))
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}
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// messageType, data, err := c.conn.ReadMessage()
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messageType, r, err := c.conn.NextReader()
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if err != nil {
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if websocket.IsUnexpectedCloseError(err, websocket.CloseGoingAway) {
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c.fireError(err)
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}
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break
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} else {
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c.onMessageReceived(messageType, r)
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}
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}
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}
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func (c *client) onMessageReceived(messageType int, r io.Reader) {
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req := new(Request)
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err := json.NewDecoder(r).Decode(req)
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if err != nil {
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2017-07-26 10:00:39 +00:00
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log.Println(err)
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}
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2017-08-09 08:20:44 +00:00
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parts := strings.Split(req.Method, ".")
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2017-08-09 08:20:44 +00:00
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si := &serverGrpc.ServerInput{
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Target: parts[0],
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Method: parts[1],
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Params: req.Params,
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2017-07-13 12:01:28 +00:00
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}
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2017-08-09 08:20:44 +00:00
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grpcPool, err := c.server.GetGRPCPool().Get()
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if nil != err {
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c.writeError(req, NewError(E_INTERNAL, err, nil))
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}
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defer c.server.GetGRPCPool().Put(grpcPool)
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grpcClient := grpcPool.(serverGrpc.OverflowApiServerClient)
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out, err := grpcClient.Exec(context.Background(), si)
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if err != nil {
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2017-08-14 10:07:13 +00:00
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c.writeError(req, NewGrpcError(err))
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return
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}
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2017-08-09 08:20:44 +00:00
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c.writeResult(req, out.Result)
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}
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func (c *client) fireError(err error) {
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for _, cb := range c.onErrorListeners {
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cb(err)
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}
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}
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2017-08-09 08:20:44 +00:00
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func (c *client) writeResult(r *Request, result string) {
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c.writeMTX.Lock()
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if writeTimeout := c.server.GetOptions().WriteTimeout; writeTimeout > 0 {
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// set the write deadline based on the configuration
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err := c.conn.SetWriteDeadline(time.Now().Add(writeTimeout))
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log.Println(fmt.Errorf("%v", err))
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}
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res := &Response{
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Protocol: r.Protocol,
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ID: r.ID,
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Result: &result,
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Error: nil,
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}
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jRes, err := json.Marshal(res)
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if nil != err {
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2017-08-09 08:20:44 +00:00
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log.Println(fmt.Errorf("%v", err))
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2017-07-13 12:01:28 +00:00
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}
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err = c.conn.WriteMessage(c.messageType, jRes)
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c.writeMTX.Unlock()
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if nil != err {
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2017-08-09 08:20:44 +00:00
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_ = c.Disconnect()
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2017-07-13 12:01:28 +00:00
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}
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}
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2017-08-09 08:20:44 +00:00
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func (c *client) writeError(r *Request, perr *Error) {
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2017-07-13 12:01:28 +00:00
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c.writeMTX.Lock()
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if writeTimeout := c.server.GetOptions().WriteTimeout; writeTimeout > 0 {
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// set the write deadline based on the configuration
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err := c.conn.SetWriteDeadline(time.Now().Add(writeTimeout))
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log.Println(fmt.Errorf("%v", err))
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}
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res := &Response{
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Protocol: r.Protocol,
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ID: r.ID,
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Result: nil,
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Error: perr,
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}
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jRes, err := json.Marshal(res)
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if nil != err {
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2017-08-09 08:20:44 +00:00
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log.Println(fmt.Errorf("%v", err))
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2017-07-13 12:01:28 +00:00
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}
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err = c.conn.WriteMessage(c.messageType, jRes)
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c.writeMTX.Unlock()
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if nil != err {
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2017-08-09 08:20:44 +00:00
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_ = c.Disconnect()
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2017-07-13 12:01:28 +00:00
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}
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}
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