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fix: Disable compression for websocket dRPC transport #145

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Merged
merged 3 commits into from
Feb 2, 2022
Merged

fix: Disable compression for websocket dRPC transport #145

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236ab22
Add proxy 'Write' that clones the bytes prior to forwarding
bryphe-coder Feb 2, 2022
2a5ba89
Bring back return
bryphe-coder Feb 2, 2022
eef4d3a
Turn off compression to avoid race
bryphe-coder Feb 2, 2022
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Turn off compression to avoid race
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@bryphe-coder
bryphe-coder committed Feb 2, 2022
commit eef4d3af9536226efb9b0a19e632bf2728a38c02
38 changes: 5 additions & 33 deletions coderd/provisionerdaemons.go
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Original file line number Diff line number Diff line change
Expand Up @@ -6,7 +6,6 @@ import (
"encoding/json"
"errors"
"fmt"
"io"
"net/http"
"reflect"
"time"
Expand Down Expand Up @@ -47,36 +46,12 @@ func (api *api) provisionerDaemons(rw http.ResponseWriter, r *http.Request) {
render.JSON(rw, r, daemons)
}

type proxiedConn struct {
conn io.ReadWriteCloser
}

func (c *proxiedConn) Close() error {
return c.conn.Close()
}
func (c *proxiedConn) Write(p []byte) (int, error) {
// Copy the data to avoid a race condition
cpy := make([]byte, len(p))
copy(cpy, p)
return c.conn.Write(cpy)
}

func (c *proxiedConn) Read(p []byte) (int, error) {
// In theory, this could be deep-copied too - but it actually causes a failure.
//cpy := make([]byte, len(p))
//copy(cpy, p)
return c.conn.Read(p)
}

func createCopyOnReadProxy(pipesToProxy io.ReadWriteCloser) io.ReadWriteCloser {
return &proxiedConn{
conn: pipesToProxy,
}
}

// Serves the provisioner daemon protobuf API over a WebSocket.
func (api *api) provisionerDaemonsServe(rw http.ResponseWriter, r *http.Request) {
conn, err := websocket.Accept(rw, r, nil)
conn, err := websocket.Accept(rw, r, &websocket.AcceptOptions{
// Need to disable compression to avoid a data-race
CompressionMode: websocket.CompressionDisabled,
})
if err != nil {
httpapi.Write(rw, http.StatusBadRequest, httpapi.Response{
Message: fmt.Sprintf("accept websocket: %s", err),
Expand All @@ -95,13 +70,10 @@ func (api *api) provisionerDaemonsServe(rw http.ResponseWriter, r *http.Request)
return
}

netConn := websocket.NetConn(r.Context(), conn, websocket.MessageBinary)
proxiedConn := createCopyOnReadProxy(netConn)

// Multiplexes the incoming connection using yamux.
// This allows multiple function calls to occur over
// the same connection.
session, err := yamux.Server(proxiedConn, nil)
session, err := yamux.Server(websocket.NetConn(r.Context(), conn, websocket.MessageBinary), nil)
if err != nil {
_ = conn.Close(websocket.StatusInternalError, fmt.Sprintf("multiplex server: %s", err))
return
Expand Down