439 lines
13 KiB
Go
439 lines
13 KiB
Go
/*
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*
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* Copyright 2016, Google Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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package grpc
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import (
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"fmt"
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"math"
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"sync"
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"testing"
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"time"
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"golang.org/x/net/context"
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"google.golang.org/grpc/codes"
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"google.golang.org/grpc/naming"
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)
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type testWatcher struct {
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// the channel to receives name resolution updates
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update chan *naming.Update
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// the side channel to get to know how many updates in a batch
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side chan int
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// the channel to notifiy update injector that the update reading is done
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readDone chan int
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}
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func (w *testWatcher) Next() (updates []*naming.Update, err error) {
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n := <-w.side
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if n == 0 {
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return nil, fmt.Errorf("w.side is closed")
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}
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for i := 0; i < n; i++ {
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u := <-w.update
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if u != nil {
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updates = append(updates, u)
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}
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}
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w.readDone <- 0
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return
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}
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func (w *testWatcher) Close() {
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}
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// Inject naming resolution updates to the testWatcher.
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func (w *testWatcher) inject(updates []*naming.Update) {
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w.side <- len(updates)
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for _, u := range updates {
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w.update <- u
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}
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<-w.readDone
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}
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type testNameResolver struct {
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w *testWatcher
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addr string
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}
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func (r *testNameResolver) Resolve(target string) (naming.Watcher, error) {
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r.w = &testWatcher{
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update: make(chan *naming.Update, 1),
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side: make(chan int, 1),
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readDone: make(chan int),
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}
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r.w.side <- 1
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r.w.update <- &naming.Update{
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Op: naming.Add,
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Addr: r.addr,
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}
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go func() {
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<-r.w.readDone
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}()
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return r.w, nil
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}
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func startServers(t *testing.T, numServers int, maxStreams uint32) ([]*server, *testNameResolver) {
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var servers []*server
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for i := 0; i < numServers; i++ {
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s := newTestServer()
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servers = append(servers, s)
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go s.start(t, 0, maxStreams)
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s.wait(t, 2*time.Second)
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}
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// Point to server[0]
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addr := "127.0.0.1:" + servers[0].port
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return servers, &testNameResolver{
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addr: addr,
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}
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}
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func TestNameDiscovery(t *testing.T) {
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// Start 2 servers on 2 ports.
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numServers := 2
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servers, r := startServers(t, numServers, math.MaxUint32)
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cc, err := Dial("foo.bar.com", WithBalancer(RoundRobin(r)), WithBlock(), WithInsecure(), WithCodec(testCodec{}))
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if err != nil {
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t.Fatalf("Failed to create ClientConn: %v", err)
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}
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req := "port"
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var reply string
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if err := Invoke(context.Background(), "/foo/bar", &req, &reply, cc); err == nil || ErrorDesc(err) != servers[0].port {
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t.Fatalf("grpc.Invoke(_, _, _, _, _) = %v, want %s", err, servers[0].port)
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}
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// Inject the name resolution change to remove servers[0] and add servers[1].
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var updates []*naming.Update
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updates = append(updates, &naming.Update{
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Op: naming.Delete,
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Addr: "127.0.0.1:" + servers[0].port,
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})
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updates = append(updates, &naming.Update{
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Op: naming.Add,
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Addr: "127.0.0.1:" + servers[1].port,
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})
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r.w.inject(updates)
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// Loop until the rpcs in flight talks to servers[1].
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for {
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if err := Invoke(context.Background(), "/foo/bar", &req, &reply, cc); err != nil && ErrorDesc(err) == servers[1].port {
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break
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}
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time.Sleep(10 * time.Millisecond)
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}
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cc.Close()
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for i := 0; i < numServers; i++ {
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servers[i].stop()
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}
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}
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func TestEmptyAddrs(t *testing.T) {
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servers, r := startServers(t, 1, math.MaxUint32)
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cc, err := Dial("foo.bar.com", WithBalancer(RoundRobin(r)), WithBlock(), WithInsecure(), WithCodec(testCodec{}))
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if err != nil {
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t.Fatalf("Failed to create ClientConn: %v", err)
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}
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var reply string
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if err := Invoke(context.Background(), "/foo/bar", &expectedRequest, &reply, cc); err != nil || reply != expectedResponse {
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t.Fatalf("grpc.Invoke(_, _, _, _, _) = %v, reply = %q, want %q, <nil>", err, reply, expectedResponse)
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}
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// Inject name resolution change to remove the server so that there is no address
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// available after that.
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u := &naming.Update{
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Op: naming.Delete,
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Addr: "127.0.0.1:" + servers[0].port,
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}
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r.w.inject([]*naming.Update{u})
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// Loop until the above updates apply.
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for {
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time.Sleep(10 * time.Millisecond)
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ctx, _ := context.WithTimeout(context.Background(), 10*time.Millisecond)
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if err := Invoke(ctx, "/foo/bar", &expectedRequest, &reply, cc); err != nil {
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break
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}
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}
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cc.Close()
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servers[0].stop()
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}
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func TestRoundRobin(t *testing.T) {
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// Start 3 servers on 3 ports.
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numServers := 3
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servers, r := startServers(t, numServers, math.MaxUint32)
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cc, err := Dial("foo.bar.com", WithBalancer(RoundRobin(r)), WithBlock(), WithInsecure(), WithCodec(testCodec{}))
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if err != nil {
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t.Fatalf("Failed to create ClientConn: %v", err)
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}
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// Add servers[1] to the service discovery.
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u := &naming.Update{
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Op: naming.Add,
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Addr: "127.0.0.1:" + servers[1].port,
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}
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r.w.inject([]*naming.Update{u})
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req := "port"
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var reply string
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// Loop until servers[1] is up
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for {
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if err := Invoke(context.Background(), "/foo/bar", &req, &reply, cc); err != nil && ErrorDesc(err) == servers[1].port {
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break
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}
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time.Sleep(10 * time.Millisecond)
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}
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// Add server2[2] to the service discovery.
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u = &naming.Update{
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Op: naming.Add,
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Addr: "127.0.0.1:" + servers[2].port,
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}
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r.w.inject([]*naming.Update{u})
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// Loop until both servers[2] are up.
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for {
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if err := Invoke(context.Background(), "/foo/bar", &req, &reply, cc); err != nil && ErrorDesc(err) == servers[2].port {
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break
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}
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time.Sleep(10 * time.Millisecond)
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}
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// Check the incoming RPCs served in a round-robin manner.
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for i := 0; i < 10; i++ {
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if err := Invoke(context.Background(), "/foo/bar", &req, &reply, cc); err == nil || ErrorDesc(err) != servers[i%numServers].port {
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t.Fatalf("Index %d: Invoke(_, _, _, _, _) = %v, want %s", i, err, servers[i%numServers].port)
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}
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}
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cc.Close()
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for i := 0; i < numServers; i++ {
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servers[i].stop()
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}
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}
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func TestCloseWithPendingRPC(t *testing.T) {
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servers, r := startServers(t, 1, math.MaxUint32)
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cc, err := Dial("foo.bar.com", WithBalancer(RoundRobin(r)), WithBlock(), WithInsecure(), WithCodec(testCodec{}))
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if err != nil {
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t.Fatalf("Failed to create ClientConn: %v", err)
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}
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var reply string
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if err := Invoke(context.Background(), "/foo/bar", &expectedRequest, &reply, cc, FailFast(false)); err != nil {
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t.Fatalf("grpc.Invoke(_, _, _, _, _) = %v, want %s", err, servers[0].port)
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}
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// Remove the server.
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updates := []*naming.Update{{
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Op: naming.Delete,
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Addr: "127.0.0.1:" + servers[0].port,
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}}
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r.w.inject(updates)
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// Loop until the above update applies.
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for {
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ctx, _ := context.WithTimeout(context.Background(), 10*time.Millisecond)
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if err := Invoke(ctx, "/foo/bar", &expectedRequest, &reply, cc, FailFast(false)); Code(err) == codes.DeadlineExceeded {
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break
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}
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time.Sleep(10 * time.Millisecond)
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}
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// Issue 2 RPCs which should be completed with error status once cc is closed.
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var wg sync.WaitGroup
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wg.Add(2)
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go func() {
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defer wg.Done()
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var reply string
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if err := Invoke(context.Background(), "/foo/bar", &expectedRequest, &reply, cc, FailFast(false)); err == nil {
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t.Errorf("grpc.Invoke(_, _, _, _, _) = %v, want not nil", err)
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}
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}()
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go func() {
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defer wg.Done()
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var reply string
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time.Sleep(5 * time.Millisecond)
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if err := Invoke(context.Background(), "/foo/bar", &expectedRequest, &reply, cc, FailFast(false)); err == nil {
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t.Errorf("grpc.Invoke(_, _, _, _, _) = %v, want not nil", err)
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}
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}()
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time.Sleep(5 * time.Millisecond)
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cc.Close()
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wg.Wait()
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servers[0].stop()
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}
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func TestGetOnWaitChannel(t *testing.T) {
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servers, r := startServers(t, 1, math.MaxUint32)
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cc, err := Dial("foo.bar.com", WithBalancer(RoundRobin(r)), WithBlock(), WithInsecure(), WithCodec(testCodec{}))
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if err != nil {
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t.Fatalf("Failed to create ClientConn: %v", err)
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}
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// Remove all servers so that all upcoming RPCs will block on waitCh.
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updates := []*naming.Update{{
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Op: naming.Delete,
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Addr: "127.0.0.1:" + servers[0].port,
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}}
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r.w.inject(updates)
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for {
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var reply string
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ctx, _ := context.WithTimeout(context.Background(), 10*time.Millisecond)
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if err := Invoke(ctx, "/foo/bar", &expectedRequest, &reply, cc, FailFast(false)); Code(err) == codes.DeadlineExceeded {
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break
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}
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time.Sleep(10 * time.Millisecond)
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}
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var wg sync.WaitGroup
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wg.Add(1)
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go func() {
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defer wg.Done()
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var reply string
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if err := Invoke(context.Background(), "/foo/bar", &expectedRequest, &reply, cc, FailFast(false)); err != nil {
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t.Errorf("grpc.Invoke(_, _, _, _, _) = %v, want <nil>", err)
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}
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}()
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// Add a connected server to get the above RPC through.
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updates = []*naming.Update{{
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Op: naming.Add,
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Addr: "127.0.0.1:" + servers[0].port,
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}}
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r.w.inject(updates)
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// Wait until the above RPC succeeds.
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wg.Wait()
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cc.Close()
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servers[0].stop()
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}
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func TestOneServerDown(t *testing.T) {
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// Start 2 servers.
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numServers := 2
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servers, r := startServers(t, numServers, math.MaxUint32)
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cc, err := Dial("foo.bar.com", WithBalancer(RoundRobin(r)), WithBlock(), WithInsecure(), WithCodec(testCodec{}))
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if err != nil {
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t.Fatalf("Failed to create ClientConn: %v", err)
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}
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// Add servers[1] to the service discovery.
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var updates []*naming.Update
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updates = append(updates, &naming.Update{
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Op: naming.Add,
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Addr: "127.0.0.1:" + servers[1].port,
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})
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r.w.inject(updates)
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req := "port"
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var reply string
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// Loop until servers[1] is up
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for {
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if err := Invoke(context.Background(), "/foo/bar", &req, &reply, cc); err != nil && ErrorDesc(err) == servers[1].port {
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break
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}
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time.Sleep(10 * time.Millisecond)
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}
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var wg sync.WaitGroup
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numRPC := 100
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sleepDuration := 10 * time.Millisecond
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wg.Add(1)
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go func() {
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time.Sleep(sleepDuration)
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// After sleepDuration, kill server[0].
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servers[0].stop()
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wg.Done()
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}()
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// All non-failfast RPCs should not block because there's at least one connection available.
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for i := 0; i < numRPC; i++ {
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wg.Add(1)
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go func() {
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time.Sleep(sleepDuration)
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// After sleepDuration, invoke RPC.
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// server[0] is killed around the same time to make it racy between balancer and gRPC internals.
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Invoke(context.Background(), "/foo/bar", &req, &reply, cc, FailFast(false))
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wg.Done()
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}()
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}
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wg.Wait()
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cc.Close()
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for i := 0; i < numServers; i++ {
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servers[i].stop()
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}
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}
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func TestOneAddressRemoval(t *testing.T) {
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// Start 2 servers.
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numServers := 2
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servers, r := startServers(t, numServers, math.MaxUint32)
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cc, err := Dial("foo.bar.com", WithBalancer(RoundRobin(r)), WithBlock(), WithInsecure(), WithCodec(testCodec{}))
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if err != nil {
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t.Fatalf("Failed to create ClientConn: %v", err)
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}
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// Add servers[1] to the service discovery.
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var updates []*naming.Update
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updates = append(updates, &naming.Update{
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Op: naming.Add,
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Addr: "127.0.0.1:" + servers[1].port,
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})
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r.w.inject(updates)
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req := "port"
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var reply string
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// Loop until servers[1] is up
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for {
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if err := Invoke(context.Background(), "/foo/bar", &req, &reply, cc); err != nil && ErrorDesc(err) == servers[1].port {
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break
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}
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time.Sleep(10 * time.Millisecond)
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}
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var wg sync.WaitGroup
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numRPC := 100
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sleepDuration := 10 * time.Millisecond
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wg.Add(1)
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go func() {
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time.Sleep(sleepDuration)
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// After sleepDuration, delete server[0].
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var updates []*naming.Update
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updates = append(updates, &naming.Update{
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Op: naming.Delete,
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Addr: "127.0.0.1:" + servers[0].port,
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})
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r.w.inject(updates)
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wg.Done()
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}()
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// All non-failfast RPCs should not fail because there's at least one connection available.
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for i := 0; i < numRPC; i++ {
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wg.Add(1)
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go func() {
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var reply string
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time.Sleep(sleepDuration)
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// After sleepDuration, invoke RPC.
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// server[0] is removed around the same time to make it racy between balancer and gRPC internals.
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if err := Invoke(context.Background(), "/foo/bar", &expectedRequest, &reply, cc, FailFast(false)); err != nil {
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t.Errorf("grpc.Invoke(_, _, _, _, _) = %v, want not nil", err)
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}
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wg.Done()
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}()
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}
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wg.Wait()
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cc.Close()
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for i := 0; i < numServers; i++ {
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servers[i].stop()
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}
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}
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