all goroutines are dead asleep - deadlock! wasm docs
Nobody has claimed this yet.
Assessment
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Newbie friendliness
- 30/100
- Issue type
- Bug
- Clarity
- Mostly clear
- Activity status
- Stale
- Tech stack
- go, wasm
- Domain
- networking
Research direction
Start with cmd/go-ws-client/main.go and reproduce the window.goWS("ws://localhost:8080/ws-chat") call using the provided index.html and Makefile commands. Then inspect ws_js.go around the reported Dial stack frame and compare the WebAssembly behavior with the server example. Done means the deadlock is explained and the issue's documented usage or reproduction is corrected and verified.
Written by the indexing model from the issue text.
Description
I'm trying to do the next:
Client Code:
//go:build js && wasm
package main
import (
"context"
"log"
"syscall/js"
"nhooyr.io/websocket"
)
func main() {
ctx := context.Background()
window := js.Global()
window.Set("goWS", js.FuncOf(func(_ js.Value, args []js.Value) any {
conn, _, err := websocket.Dial(ctx, args[0].String(), nil)
if err != nil {
log.Fatal(err)
}
goWSObject := window.Get("goWS")
goWSObject.Set("send", js.FuncOf(func(_ js.Value, args []js.Value) any {
if err := conn.Write(ctx, websocket.MessageText, []byte(args[0].String())); err != nil {
log.Fatal(err)
}
return nil
}))
goWSObject.Set("waitMessage", js.FuncOf(func(_ js.Value, _ []js.Value) any {
_, bb, err := conn.Read(ctx)
if err != nil {
log.Fatal(err)
}
return bb
}))
return nil
}))
waitCh := make(chan struct{})
<-waitCh
}
index.html:
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>goWS</title>
<script src="/assets/wasm_exec.js"></script>
<script>
const go = new Go();
WebAssembly.instantiateStreaming(fetch("/assets/app.wasm"), go.importObject)
.then(res => go.run(res.instance))
</script>
</head>
<body>
</body>
</html>
Server code:
package main
import (
"context"
"net/http"
"nhooyr.io/websocket"
)
func main() {
ctx := context.Background()
http.HandleFunc("/ws-chat", func(w http.ResponseWriter, r *http.Request) {
conn, err := websocket.Accept(w, r, &websocket.AcceptOptions{
InsecureSkipVerify: true,
})
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
_, bb, err := conn.Read(ctx)
if err != nil {
conn.Close(websocket.StatusInternalError, err.Error())
return
}
wr, err := conn.Writer(ctx, websocket.MessageText)
if err != nil {
conn.Close(websocket.StatusInternalError, err.Error())
return
}
wr.Write(bb)
wr.Close()
conn.CloseNow()
})
http.ListenAndServe(":8080", http.DefaultServeMux)
}
Also I'm going to attach my Makefile so you can see the commands when I'm compiling:
build_client:
GOOS=js GOARCH=wasm go build -o dist/assets/app.wasm cmd/go-ws-client/main.go
cp $(go env GOROOT)/misc/wasm/wasm_exec.js dist/assets/
build_server:
go build -o dist/bin/app-server cmd/go-ws-server/main.go
Structure of dist folder:
dist/
- assets/
- app.wasm
- wasm_exec.js
- bin/
- app-server
- index.html
But i'm getting the following errors after calling window.goWS("ws://localhost:8080/ws-chat") from the firefox browser's console:
Console:
> window.goWS("ws://localhost:8080/ws-chat")
fatal error: all goroutines are asleep - deadlock! wasm_exec.js:22:14
<empty string>
wasm_exec.js:22:14
goroutine 1 [chan receive]: wasm_exec.js:22:14
main.main() wasm_exec.js:22:14
/home/oscar/Escritorio/proyecto-react/cmd/go-ws-client/main.go:47 +0xc wasm_exec.js:22:14
<empty string> wasm_exec.js:22:14
goroutine 7 [select]: wasm_exec.js:22:14
nhooyr.io/websocket.dial({0x5aa80, 0x1430050}, {0x1466020, 0x1b}, 0x0) wasm_exec.js:22:14
/home/oscar/go/pkg/mod/nhooyr.io/websocket@v1.8.10/ws_js.go:320 +0x1c wasm_exec.js:22:14
nhooyr.io/websocket.Dial({0x5aa80, 0x1430050}, {0x1466020, 0x1b}, 0x0) wasm_exec.js:22:14
/home/oscar/go/pkg/mod/nhooyr.io/websocket@v1.8.10/ws_js.go:289 +0x2 wasm_exec.js:22:14
main.main.func1.1({{}, 0x0, 0x0}, {0x140e0f0, 0x1, 0x1}) wasm_exec.js:22:14
/home/oscar/Escritorio/proyecto-react/cmd/go-ws-client/main.go:19 +0x4 wasm_exec.js:22:14
syscall/js.handleEvent() wasm_exec.js:22:14
/usr/local/go/src/syscall/js/func.go:100 +0x26 wasm_exec.js:22:14
exit code: 2 wasm_exec.js:101:14
undefined
- Dominant language
- Go
- Stars
- 5.5k
- Forks
- 377
- PR merge metrics
- No merged PRs in 30d
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