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package lsp
import (
"bytes"
"encoding/json"
"io"
"log"
"runtime"
"strconv"
"strings"
"sync"
"sync/atomic"
"testing"
)
type raceBuffer struct {
buf bytes.Buffer
bufMu sync.Mutex
inWrite atomic.Int32
raced atomic.Bool
}
func (b *raceBuffer) Write(p []byte) (int, error) {
if b.inWrite.Swap(1) != 0 {
b.raced.Store(true)
}
runtime.Gosched()
b.bufMu.Lock()
n, err := b.buf.Write(p)
b.bufMu.Unlock()
b.inWrite.Store(0)
return n, err
}
func (b *raceBuffer) Bytes() []byte {
b.bufMu.Lock()
defer b.bufMu.Unlock()
return append([]byte(nil), b.buf.Bytes()...)
}
func (b *raceBuffer) Raced() bool {
return b.raced.Load()
}
func TestServerReplySerializesWrites(t *testing.T) {
t.Parallel()
writer := &raceBuffer{}
srv := NewServer(bytes.NewReader([]byte{}), writer, log.New(io.Discard, "", 0), ServerOptions{})
const goroutines = 16
start := make(chan struct{})
var wg sync.WaitGroup
for i := 0; i < goroutines; i++ {
wg.Add(1)
go func(i int) {
defer wg.Done()
<-start
id := json.RawMessage(strconv.Itoa(i + 1))
srv.reply(id, map[string]int{"index": i}, nil)
}(i)
}
close(start)
wg.Wait()
if writer.Raced() {
t.Fatalf("detected overlapping writes to server output")
}
data := writer.Bytes()
for len(data) > 0 {
headerEnd := bytes.Index(data, []byte("\r\n\r\n"))
if headerEnd < 0 {
t.Fatalf("missing header delimiter in %q", string(data))
}
header := string(data[:headerEnd])
if !strings.HasPrefix(header, "Content-Length: ") {
t.Fatalf("unexpected header %q", header)
}
lengthStr := strings.TrimSpace(header[len("Content-Length: "):])
length, err := strconv.Atoi(lengthStr)
if err != nil {
t.Fatalf("invalid content length %q: %v", lengthStr, err)
}
payloadStart := headerEnd + 4
payloadEnd := payloadStart + length
if payloadEnd > len(data) {
t.Fatalf("payload truncated: need %d bytes, have %d", length, len(data)-payloadStart)
}
data = data[payloadEnd:]
}
}
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