// Copyright 2016 The go-ethereum Authors // This file is part of the go-ethereum library. // // The go-ethereum library is free software: you can redistribute it and/or modify // it under the terms of the GNU Lesser General Public License as published by // the Free Software Foundation, either version 3 of the License, or // (at your option) any later version. // // The go-ethereum library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU Lesser General Public License for more details. // // You should have received a copy of the GNU Lesser General Public License // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. package rpc import ( "encoding/json" "net" "testing" "time" "golang.org/x/net/context" ) type NotificationTestService struct{} var ( unsubCallbackCalled = false ) func (s *NotificationTestService) Unsubscribe(subid string) { unsubCallbackCalled = true } func (s *NotificationTestService) SomeSubscription(ctx context.Context, n, val int) (Subscription, error) { notifier, supported := NotifierFromContext(ctx) if !supported { return nil, ErrNotificationsUnsupported } // by explicitly creating an subscription we make sure that the subscription id is send back to the client // before the first subscription.Notify is called. Otherwise the events might be send before the response // for the eth_subscribe method. subscription, err := notifier.NewSubscription(s.Unsubscribe) if err != nil { return nil, err } go func() { for i := 0; i < n; i++ { if err := subscription.Notify(val + i); err != nil { return } } }() return subscription, nil } func TestNotifications(t *testing.T) { server := NewServer() service := &NotificationTestService{} if err := server.RegisterName("eth", service); err != nil { t.Fatalf("unable to register test service %v", err) } clientConn, serverConn := net.Pipe() go server.ServeCodec(NewJSONCodec(serverConn), OptionMethodInvocation|OptionSubscriptions) out := json.NewEncoder(clientConn) in := json.NewDecoder(clientConn) n := 5 val := 12345 request := map[string]interface{}{ "id": 1, "method": "eth_subscribe", "version": "2.0", "params": []interface{}{"someSubscription", n, val}, } // create subscription if err := out.Encode(request); err != nil { t.Fatal(err) } var subid string response := JSONSuccessResponse{Result: subid} if err := in.Decode(&response); err != nil { t.Fatal(err) } var ok bool if subid, ok = response.Result.(string); !ok { t.Fatalf("expected subscription id, got %T", response.Result) } for i := 0; i < n; i++ { var notification jsonNotification if err := in.Decode(¬ification); err != nil { t.Fatalf("%v", err) } if int(notification.Params.Result.(float64)) != val+i { t.Fatalf("expected %d, got %d", val+i, notification.Params.Result) } } clientConn.Close() // causes notification unsubscribe callback to be called time.Sleep(1 * time.Second) if !unsubCallbackCalled { t.Error("unsubscribe callback not called after closing connection") } }