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exec.go
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exec.go
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package httpapi
import (
"io"
"net/http"
"github.com/hashicorp/go-hclog"
"nhooyr.io/websocket"
"nhooyr.io/websocket/wspb"
"github.com/hashicorp/waypoint/internal/clicontext"
pb "github.com/hashicorp/waypoint/pkg/server/gen"
"github.com/hashicorp/waypoint/pkg/serverclient"
"github.com/hashicorp/waypoint/pkg/serverconfig"
)
// HandleExec handles the `waypoint exec` websocket API. This works by
// connecting back to our own local gRPC server.
func HandleExec(addr string, tls bool) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
log := hclog.FromContext(ctx)
log.SetLevel(hclog.Trace)
// Get our authorization token
token := r.URL.Query().Get("token")
if token == "" {
http.Error(w, "no token provided", 403)
return
}
// Accept our websocket connection.
c, err := websocket.Accept(w, r, &websocket.AcceptOptions{
// We allow connections from anywhere so that the UI can be on another
// host and so that we work with proxying. We aren't too worried about
// CSRF due to the nature of Waypoint servers and the underlying
// protocols and auth tokens, but one day it'd be nice to be stricter
// here and accept only known UI hosts (we don't even have this
// config at the time of writing).
InsecureSkipVerify: true,
})
if err != nil {
log.Info("error accepting websocket connection", "err", err)
return
}
// We can defer close an error because multiple calls to Close are ignored.
defer c.Close(websocket.StatusInternalError, "early exit")
// Connect back to our own gRPC service.
grpcConn, err := serverclient.Connect(ctx,
serverclient.Logger(log),
serverclient.FromContextConfig(&clicontext.Config{
Server: serverconfig.Client{
Address: addr,
RequireAuth: true,
AuthToken: token,
// Our gRPC server should always be listening on TLS.
// We ignore it because its coming out of our own process.
Tls: tls,
TlsSkipVerify: true,
},
}),
)
if err != nil {
log.Error("exec connection back to gRPC failed", "err", err)
c.Close(
websocket.StatusInternalError,
"failed to connect to internal server",
)
return
}
defer grpcConn.Close()
// Our API client
client := pb.NewWaypointClient(grpcConn)
// Start our exec stream
exec, err := client.StartExecStream(ctx)
if err != nil {
c.Close(
websocket.StatusInternalError,
err.Error(),
)
return
}
defer exec.CloseSend()
// Start a goroutine that'll just read requests from our websocket.
// This will exit once our connection is closed.
reqCh := make(chan *pb.ExecStreamRequest)
go func() {
for {
var req pb.ExecStreamRequest
err := wspb.Read(ctx, c, &req)
if err != nil {
if err != io.EOF {
log.Error("websocket receive error", "err", err)
}
return
}
select {
case reqCh <- &req:
case <-ctx.Done():
log.Warn("context canceled while waiting to send data")
return
}
}
}()
// Start goroutine that'll just read exec stream responses. This
// will exit once our connection is closed.
respCh := make(chan *pb.ExecStreamResponse)
go func() {
for {
resp, err := exec.Recv()
if err != nil {
if err != io.EOF {
log.Error("stream receive error", "err", err)
}
return
}
// Send our received data but exit if our context is canceled.
select {
case respCh <- resp:
case <-ctx.Done():
log.Warn("context canceled while waiting to send data")
return
}
}
}()
// Sit in an event loop and just shuttle data back and forth.
for {
select {
case <-ctx.Done():
// Done!
c.Close(websocket.StatusNormalClosure, "")
return
case req := <-reqCh:
if err := exec.Send(req); err != nil {
c.Close(websocket.StatusInternalError, err.Error())
return
}
case resp := <-respCh:
if err := wspb.Write(ctx, c, resp); err != nil {
c.Close(websocket.StatusInternalError, err.Error())
return
}
}
}
}
}