--- /dev/null
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package protocol
+
+import (
+ "bytes"
+ "context"
+
+ "golang.org/x/tools/internal/event"
+ "golang.org/x/tools/internal/event/core"
+ "golang.org/x/tools/internal/event/export"
+ "golang.org/x/tools/internal/event/label"
+ "golang.org/x/tools/internal/xcontext"
+)
+
+type contextKey int
+
+const (
+ clientKey = contextKey(iota)
+)
+
+func WithClient(ctx context.Context, client Client) context.Context {
+ return context.WithValue(ctx, clientKey, client)
+}
+
+func LogEvent(ctx context.Context, ev core.Event, lm label.Map, mt MessageType) context.Context {
+ client, ok := ctx.Value(clientKey).(Client)
+ if !ok {
+ return ctx
+ }
+ buf := &bytes.Buffer{}
+ p := export.Printer{}
+ p.WriteEvent(buf, ev, lm)
+ msg := &LogMessageParams{Type: mt, Message: buf.String()}
+ // Handle messages generated via event.Error, which won't have a level Label.
+ if event.IsError(ev) {
+ msg.Type = Error
+ }
+ go client.LogMessage(xcontext.Detach(ctx), msg)
+ return ctx
+}