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subscription_test.go
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subscription_test.go
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// 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 (
"context"
"encoding/json"
"fmt"
"net"
"sync"
"testing"
"time"
)
type NotificationTestService struct {
mu sync.Mutex
unsubscribed chan string
gotHangSubscriptionReq chan struct{}
unblockHangSubscription chan struct{}
}
func (s *NotificationTestService) Echo(i int) int {
return i
}
func (s *NotificationTestService) Unsubscribe(subid string) {
if s.unsubscribed != nil {
s.unsubscribed <- subid
}
}
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 := notifier.CreateSubscription()
go func() {
// test expects n events, if we begin sending event immediately some events
// will probably be dropped since the subscription ID might not be send to
// the client.
for i := 0; i < n; i++ {
if err := notifier.Notify(subscription.ID, val+i); err != nil {
return
}
}
select {
case <-notifier.Closed():
case <-subscription.Err():
}
if s.unsubscribed != nil {
s.unsubscribed <- string(subscription.ID)
}
}()
return subscription, nil
}
// HangSubscription blocks on s.unblockHangSubscription before
// sending anything.
func (s *NotificationTestService) HangSubscription(ctx context.Context, val int) (*Subscription, error) {
notifier, supported := NotifierFromContext(ctx)
if !supported {
return nil, ErrNotificationsUnsupported
}
s.gotHangSubscriptionReq <- struct{}{}
<-s.unblockHangSubscription
subscription := notifier.CreateSubscription()
go func() {
notifier.Notify(subscription.ID, val)
}()
return subscription, nil
}
func TestNotifications(t *testing.T) {
server := NewServer()
service := &NotificationTestService{unsubscribed: make(chan string)}
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 _, 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
select {
case <-service.unsubscribed:
case <-time.After(1 * time.Second):
t.Fatal("Unsubscribe not called after one second")
}
}
func waitForMessages(t *testing.T, in *json.Decoder, successes chan<- jsonSuccessResponse,
failures chan<- jsonErrResponse, notifications chan<- jsonNotification, errors chan<- error) {
// read and parse server messages
for {
var rmsg json.RawMessage
if err := in.Decode(&rmsg); err != nil {
return
}
var responses []map[string]interface{}
if rmsg[0] == '[' {
if err := json.Unmarshal(rmsg, &responses); err != nil {
errors <- fmt.Errorf("Received invalid message: %s", rmsg)
return
}
} else {
var msg map[string]interface{}
if err := json.Unmarshal(rmsg, &msg); err != nil {
errors <- fmt.Errorf("Received invalid message: %s", rmsg)
return
}
responses = append(responses, msg)
}
for _, msg := range responses {
// determine what kind of msg was received and broadcast
// it to over the corresponding channel
if _, found := msg["result"]; found {
successes <- jsonSuccessResponse{
Version: msg["jsonrpc"].(string),
Id: msg["id"],
Result: msg["result"],
}
continue
}
if _, found := msg["error"]; found {
params := msg["params"].(map[string]interface{})
failures <- jsonErrResponse{
Version: msg["jsonrpc"].(string),
Id: msg["id"],
Error: jsonError{int(params["subscription"].(float64)), params["message"].(string), params["data"]},
}
continue
}
if _, found := msg["params"]; found {
params := msg["params"].(map[string]interface{})
notifications <- jsonNotification{
Version: msg["jsonrpc"].(string),
Method: msg["method"].(string),
Params: jsonSubscription{params["subscription"].(string), params["result"]},
}
continue
}
errors <- fmt.Errorf("Received invalid message: %s", msg)
}
}
}
// TestSubscriptionMultipleNamespaces ensures that subscriptions can exists
// for multiple different namespaces.
func TestSubscriptionMultipleNamespaces(t *testing.T) {
var (
namespaces = []string{"eth", "shh", "bzz"}
service = NotificationTestService{}
subCount = len(namespaces) * 2
notificationCount = 3
server = NewServer()
clientConn, serverConn = net.Pipe()
out = json.NewEncoder(clientConn)
in = json.NewDecoder(clientConn)
successes = make(chan jsonSuccessResponse)
failures = make(chan jsonErrResponse)
notifications = make(chan jsonNotification)
errors = make(chan error, 10)
)
// setup and start server
for _, namespace := range namespaces {
if err := server.RegisterName(namespace, &service); err != nil {
t.Fatalf("unable to register test service %v", err)
}
}
go server.ServeCodec(NewJSONCodec(serverConn), OptionMethodInvocation|OptionSubscriptions)
defer server.Stop()
// wait for message and write them to the given channels
go waitForMessages(t, in, successes, failures, notifications, errors)
// create subscriptions one by one
for i, namespace := range namespaces {
request := map[string]interface{}{
"id": i,
"method": fmt.Sprintf("%s_subscribe", namespace),
"version": "2.0",
"params": []interface{}{"someSubscription", notificationCount, i},
}
if err := out.Encode(&request); err != nil {
t.Fatalf("Could not create subscription: %v", err)
}
}
// create all subscriptions in 1 batch
var requests []interface{}
for i, namespace := range namespaces {
requests = append(requests, map[string]interface{}{
"id": i,
"method": fmt.Sprintf("%s_subscribe", namespace),
"version": "2.0",
"params": []interface{}{"someSubscription", notificationCount, i},
})
}
if err := out.Encode(&requests); err != nil {
t.Fatalf("Could not create subscription in batch form: %v", err)
}
timeout := time.After(30 * time.Second)
subids := make(map[string]string, subCount)
count := make(map[string]int, subCount)
allReceived := func() bool {
done := len(count) == subCount
for _, c := range count {
if c < notificationCount {
done = false
}
}
return done
}
for !allReceived() {
select {
case suc := <-successes: // subscription created
subids[namespaces[int(suc.Id.(float64))]] = suc.Result.(string)
case notification := <-notifications:
count[notification.Params.Subscription]++
case err := <-errors:
t.Fatal(err)
case failure := <-failures:
t.Errorf("received error: %v", failure.Error)
case <-timeout:
for _, namespace := range namespaces {
subid, found := subids[namespace]
if !found {
t.Errorf("subscription for %q not created", namespace)
continue
}
if count, found := count[subid]; !found || count < notificationCount {
t.Errorf("didn't receive all notifications (%d<%d) in time for namespace %q", count, notificationCount, namespace)
}
}
t.Fatal("timed out")
}
}
}