add route for recorder

ctx/value.go

@@ -1,6 +1,9 @@
 package ctx
 
-import "context"
+import (
+	"bytes"
+	"context"
+)
 
 // clientAddrKey saves the client address.
 type clientAddrKey struct{}
@@ -74,3 +77,18 @@ func ClientIDFromContext(ctx context.Context) ClientID {
 	v, _ := ctx.Value(keyClientID).(ClientID)
 	return v
 }
+
+type bufferKey struct{}
+
+var (
+	keyBuffer = &bufferKey{}
+)
+
+func ContextWithBuffer(ctx context.Context, buffer *bytes.Buffer) context.Context {
+	return context.WithValue(ctx, keyBuffer, buffer)
+}
+
+func BufferFromContext(ctx context.Context) *bytes.Buffer {
+	v, _ := ctx.Value(keyBuffer).(*bytes.Buffer)
+	return v
+}