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