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141 lines
3.1 KiB
Go
141 lines
3.1 KiB
Go
package wire
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import (
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"encoding/json"
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"fmt"
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"io/ioutil"
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"net/url"
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"time"
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"github.com/gorilla/websocket"
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"github.com/jordanorelli/blammo"
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)
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type Client struct {
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*blammo.Log
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Host string
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Port int
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lastSeq int
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conn *websocket.Conn
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// outbox is the set of requests that we'd like to send. The send loop will
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// read off of this channel and write these values to the underlying
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// websocket connection.
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outbox chan Request
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}
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// Dial dials the server specified by the client. The returned read-only
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// channel is a channel of responses from the server that are not replies to a
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// request sent by the client.
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func (c *Client) Dial() (<-chan Response, error) {
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c.outbox = make(chan Request)
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dialer := websocket.Dialer{
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HandshakeTimeout: 3 * time.Second,
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ReadBufferSize: 32 * 1024,
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WriteBufferSize: 32 * 1024,
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Subprotocols: []string{"astrodomu@v0"},
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}
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path := url.URL{
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Host: fmt.Sprintf("%s:%d", c.Host, c.Port),
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Scheme: "ws",
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Path: "/",
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}
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c.Info("dialing: %s", path.String())
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conn, _, err := dialer.Dial(path.String(), nil)
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if err != nil {
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return nil, fmt.Errorf("dial error: %w", err)
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}
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c.Info("connected to server")
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c.conn = conn
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done := make(chan bool, 2)
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notifications := make(chan Response)
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go c.readLoop(notifications)
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go c.writeLoop(done)
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return notifications, nil
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}
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func (c *Client) Send(v Value) {
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c.lastSeq++
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d := 3 * time.Second
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timeout := time.NewTimer(d)
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select {
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case c.outbox <- NewRequest(c.lastSeq, v):
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timeout.Stop()
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case <-timeout.C:
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c.Error("send timed out after %v", d)
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}
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}
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func (c *Client) readLoop(notifications chan<- Response) {
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defer close(notifications)
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for {
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_, r, err := c.conn.NextReader()
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if err != nil {
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c.Error("unable to get a reader frame: %v", err)
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return
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}
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b, err := ioutil.ReadAll(r)
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if err != nil {
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c.Error("unable to read frame: %v", err)
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return
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}
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var res Response
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if err := json.Unmarshal(b, &res); err != nil {
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c.Error("unable to parse frame data: %v", err)
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continue
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}
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c.Child("read-frame").Info(string(b))
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if res.Re <= 0 {
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notifications <- res
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}
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}
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}
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func (c *Client) writeLoop(done chan bool) {
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for {
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select {
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case req := <-c.outbox:
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w, err := c.conn.NextWriter(websocket.TextMessage)
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if err != nil {
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c.Error("unable to get a writer frame: %v", err)
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return
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}
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b, err := json.Marshal(req)
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if err != nil {
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c.Error("unable to marshal outgoing response: %v", err)
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break
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}
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if _, err := w.Write(b); err != nil {
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c.Error("failed to write payload: %v", err)
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break
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}
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if err := w.Close(); err != nil {
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c.Error("failed to close write frame: %v", err)
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break
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}
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c.Child("write-frame").Info(string(b))
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case shouldClose := <-done:
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if shouldClose {
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msg := websocket.FormatCloseMessage(websocket.CloseNormalClosure, "")
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if err := c.conn.WriteMessage(websocket.CloseMessage, msg); err != nil {
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c.Error("failed to write close message: %v", err)
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}
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c.Info("closing connection")
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if err := c.conn.Close(); err != nil {
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c.Error("failed to close connection: %v", err)
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}
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c.Info("connection closed")
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c.conn = nil
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return
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}
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}
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}
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}
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