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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,139 @@ | ||
| // Copyright (c) 2021 Gitpod GmbH. All rights reserved. | ||
| // Licensed under the GNU Affero General Public License (AGPL). | ||
| // See License-AGPL.txt in the project root for license information. | ||
| /*--------------------------------------------------------------------------------------------- | ||
| * Copyright (c) 2020 Jaime Pillora <[email protected]>. All rights reserved. | ||
| * Licensed under the MIT License. See https://github.com/jpillora/chisel/blob/7aa0da95db178b8bc4f20ab49128368348fd4410/LICENSE for license information. | ||
| *--------------------------------------------------------------------------------------------*/ | ||
| // copied and modified from https://github.com/jpillora/chisel/blob/33fa2010abd42ec76ed9011995f5240642b1a3c5/share/cnet/conn_ws.go | ||
| package protocol | ||
|
|
||
| import ( | ||
| "context" | ||
| "sync" | ||
| "time" | ||
|
|
||
| "github.com/gorilla/websocket" | ||
| ) | ||
|
|
||
| type WebsocketConnection struct { | ||
| *websocket.Conn | ||
| buff []byte | ||
|
|
||
| Ctx context.Context | ||
| cancel func() | ||
|
|
||
| once sync.Once | ||
| closeErr error | ||
| waitDone chan struct{} | ||
| } | ||
|
|
||
| var ( | ||
| // Time allowed to write a message to the peer. | ||
| writeWait = 10 * time.Second | ||
|
|
||
| // Time allowed to read the next pong message from the peer. | ||
| pongWait = 15 * time.Second | ||
|
|
||
| // Send pings to peer with this period. Must be less than pongWait. | ||
| pingPeriod = (pongWait * 9) / 10 | ||
| ) | ||
|
|
||
| //NewWebsocketConnection converts a websocket.Conn into a net.Conn | ||
| func NewWebsocketConnection(ctx context.Context, websocketConn *websocket.Conn, onStale func(staleErr error)) (*WebsocketConnection, error) { | ||
| ctx, cancel := context.WithCancel(ctx) | ||
| c := &WebsocketConnection{ | ||
| Conn: websocketConn, | ||
| waitDone: make(chan struct{}), | ||
| Ctx: ctx, | ||
| cancel: cancel, | ||
| } | ||
| err := c.SetReadDeadline(time.Now().Add(pongWait)) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| c.SetPongHandler(func(string) error { c.SetReadDeadline(time.Now().Add(pongWait)); return nil }) | ||
|
|
||
| go func() { | ||
| defer c.Close() | ||
| ticker := time.NewTicker(pingPeriod) | ||
| defer ticker.Stop() | ||
| for { | ||
| select { | ||
| case <-ctx.Done(): | ||
| return | ||
| case <-ticker.C: | ||
| staleErr := c.WriteControl(websocket.PingMessage, []byte{}, time.Now().Add(writeWait)) | ||
| if staleErr != nil { | ||
| onStale(staleErr) | ||
| return | ||
| } | ||
| } | ||
| } | ||
| }() | ||
| return c, nil | ||
| } | ||
|
|
||
| // Close closes the connection | ||
| func (c *WebsocketConnection) Close() error { | ||
| c.once.Do(func() { | ||
| c.cancel() | ||
| c.closeErr = c.Conn.Close() | ||
| close(c.waitDone) | ||
| }) | ||
| return c.closeErr | ||
| } | ||
|
|
||
| // Wait waits till the connection is closed. | ||
| func (c *WebsocketConnection) Wait() error { | ||
| <-c.waitDone | ||
| return c.closeErr | ||
| } | ||
|
|
||
| //Read is not threadsafe though thats okay since there | ||
| //should never be more than one reader | ||
| func (c *WebsocketConnection) Read(dst []byte) (int, error) { | ||
| ldst := len(dst) | ||
| //use buffer or read new message | ||
| var src []byte | ||
| if len(c.buff) > 0 { | ||
| src = c.buff | ||
| c.buff = nil | ||
| } else if _, msg, err := c.Conn.ReadMessage(); err == nil { | ||
| src = msg | ||
| } else { | ||
| return 0, err | ||
| } | ||
| //copy src->dest | ||
| var n int | ||
| if len(src) > ldst { | ||
| //copy as much as possible of src into dst | ||
| n = copy(dst, src[:ldst]) | ||
| //copy remainder into buffer | ||
| r := src[ldst:] | ||
| lr := len(r) | ||
| c.buff = make([]byte, lr) | ||
| copy(c.buff, r) | ||
| } else { | ||
| //copy all of src into dst | ||
| n = copy(dst, src) | ||
| } | ||
| //return bytes copied | ||
| return n, nil | ||
| } | ||
|
|
||
| func (c *WebsocketConnection) Write(b []byte) (int, error) { | ||
| err := c.Conn.WriteMessage(websocket.BinaryMessage, b) | ||
| if err != nil { | ||
| return 0, err | ||
| } | ||
| n := len(b) | ||
| return n, nil | ||
| } | ||
|
|
||
| func (c *WebsocketConnection) SetDeadline(t time.Time) error { | ||
| if err := c.Conn.SetReadDeadline(t); err != nil { | ||
| return err | ||
| } | ||
| return c.Conn.SetWriteDeadline(t) | ||
| } |
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