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package rpcclient
import (
"context"
"encoding/json"
"net/http"
"net/http/httptest"
"sync"
"testing"
"time"
"github.com/gorilla/websocket"
"github.com/stretchr/testify/require"
"github.com/tendermint/tendermint/libs/log"
types "github.com/tendermint/tendermint/rpc/lib/types"
)
var wsCallTimeout = 5 * time.Second
type myHandler struct {
closeConnAfterRead bool
mtx sync.RWMutex
}
var upgrader = websocket.Upgrader{
ReadBufferSize: 1024,
WriteBufferSize: 1024,
}
func (h *myHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
conn, err := upgrader.Upgrade(w, r, nil)
if err != nil {
panic(err)
}
defer conn.Close() // nolint: errcheck
for {
messageType, _, err := conn.ReadMessage()
if err != nil {
return
}
h.mtx.RLock()
if h.closeConnAfterRead {
if err := conn.Close(); err != nil {
panic(err)
}
}
h.mtx.RUnlock()
res := json.RawMessage(`{}`)
emptyRespBytes, _ := json.Marshal(types.RPCResponse{Result: res})
if err := conn.WriteMessage(messageType, emptyRespBytes); err != nil {
return
}
}
}
func TestWSClientReconnectsAfterReadFailure(t *testing.T) {
var wg sync.WaitGroup
// start server
h := &myHandler{}
s := httptest.NewServer(h)
defer s.Close()
c := startClient(t, s.Listener.Addr().String())
defer c.Stop()
wg.Add(1)
go callWgDoneOnResult(t, c, &wg)
h.mtx.Lock()
h.closeConnAfterRead = true
h.mtx.Unlock()
// results in WS read error, no send retry because write succeeded
call(t, "a", c)
// expect to reconnect almost immediately
time.Sleep(10 * time.Millisecond)
h.mtx.Lock()
h.closeConnAfterRead = false
h.mtx.Unlock()
// should succeed
call(t, "b", c)
wg.Wait()
}
func TestWSClientReconnectsAfterWriteFailure(t *testing.T) {
var wg sync.WaitGroup
// start server
h := &myHandler{}
s := httptest.NewServer(h)
c := startClient(t, s.Listener.Addr().String())
defer c.Stop()
wg.Add(2)
go callWgDoneOnResult(t, c, &wg)
// hacky way to abort the connection before write
if err := c.conn.Close(); err != nil {
t.Error(err)
}
// results in WS write error, the client should resend on reconnect
call(t, "a", c)
// expect to reconnect almost immediately
time.Sleep(10 * time.Millisecond)
// should succeed
call(t, "b", c)
wg.Wait()
}
func TestWSClientReconnectFailure(t *testing.T) {
// start server
h := &myHandler{}
s := httptest.NewServer(h)
c := startClient(t, s.Listener.Addr().String())
defer c.Stop()
go func() {
for {
select {
case <-c.ResponsesCh:
case <-c.Quit():
return
}
}
}()
// hacky way to abort the connection before write
if err := c.conn.Close(); err != nil {
t.Error(err)
}
s.Close()
// results in WS write error
// provide timeout to avoid blocking
ctx, cancel := context.WithTimeout(context.Background(), wsCallTimeout)
defer cancel()
if err := c.Call(ctx, "a", make(map[string]interface{})); err != nil {
t.Error(err)
}
// expect to reconnect almost immediately
time.Sleep(10 * time.Millisecond)
done := make(chan struct{})
go func() {
// client should block on this
call(t, "b", c)
close(done)
}()
// test that client blocks on the second send
select {
case <-done:
t.Fatal("client should block on calling 'b' during reconnect")
case <-time.After(5 * time.Second):
t.Log("All good")
}
}
func TestNotBlockingOnStop(t *testing.T) {
timeout := 2 * time.Second
s := httptest.NewServer(&myHandler{})
c := startClient(t, s.Listener.Addr().String())
c.Call(context.Background(), "a", make(map[string]interface{}))
// Let the readRoutine get around to blocking
time.Sleep(time.Second)
passCh := make(chan struct{})
go func() {
// Unless we have a non-blocking write to ResponsesCh from readRoutine
// this blocks forever ont the waitgroup
c.Stop()
passCh <- struct{}{}
}()
select {
case <-passCh:
// Pass
case <-time.After(timeout):
t.Fatalf("WSClient did failed to stop within %v seconds - is one of the read/write routines blocking?",
timeout.Seconds())
}
}
func startClient(t *testing.T, addr string) *WSClient {
c := NewWSClient(addr, "/websocket")
err := c.Start()
require.Nil(t, err)
c.SetLogger(log.TestingLogger())
return c
}
func call(t *testing.T, method string, c *WSClient) {
err := c.Call(context.Background(), method, make(map[string]interface{}))
require.NoError(t, err)
}
func callWgDoneOnResult(t *testing.T, c *WSClient, wg *sync.WaitGroup) {
for {
select {
case resp := <-c.ResponsesCh:
if resp.Error != nil {
t.Errorf("unexpected error: %v", resp.Error)
return
}
if resp.Result != nil {
wg.Done()
}
case <-c.Quit():
return
}
}
}