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57 lines
1.3 KiB
Go
57 lines
1.3 KiB
Go
package main
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import (
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"context"
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"encoding/json"
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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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// session represents the server side of a client's session. i.e., a single
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// connection along with its associated state.
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type session struct {
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*blammo.Log
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id int
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conn *websocket.Conn
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outbox chan response
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}
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// pump is the session send loop. Pump should pump the session's outbox
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// messages to the underlying connection until the context is closed.
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func (sn *session) pump(ctx context.Context) {
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for {
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select {
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case res := <-sn.outbox:
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payload, err := json.Marshal(res)
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if err != nil {
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sn.Error("failed to marshal outgoing response: %v", err)
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break
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}
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if err := sn.conn.SetWriteDeadline(time.Now().Add(3 * time.Second)); err != nil {
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sn.Error("failed to set write deadline: %v", err)
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break
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}
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w, err := sn.conn.NextWriter(websocket.TextMessage)
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if err != nil {
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sn.Error("failed get a writer frame: %v", err)
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break
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}
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if _, err := w.Write(payload); err != nil {
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sn.Error("failed 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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sn.Error("failed to close write frame: %v", err)
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break
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}
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sn.Child("sent-frame").Info(string(payload))
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case <-ctx.Done():
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sn.Info("parent context done, shutting down write pump")
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return
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}
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}
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}
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