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balancer_switching_test.go
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balancer_switching_test.go
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/*
*
* Copyright 2017 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package grpc
import (
"fmt"
"math"
"testing"
"time"
"golang.org/x/net/context"
_ "google.golang.org/grpc/grpclog/glogger"
"google.golang.org/grpc/resolver"
"google.golang.org/grpc/resolver/manual"
"google.golang.org/grpc/test/leakcheck"
)
func checkPickFirst(cc *ClientConn, servers []*server) error {
var (
req = "port"
reply string
err error
)
connected := false
for i := 0; i < 1000; i++ {
if err = Invoke(context.Background(), "/foo/bar", &req, &reply, cc); ErrorDesc(err) == servers[0].port {
if connected {
// connected is set to false if peer is not server[0]. So if
// connected is true here, this is the second time we saw
// server[0] in a row. Break because pickfirst is in effect.
break
}
connected = true
} else {
connected = false
}
time.Sleep(time.Millisecond)
}
if !connected {
return fmt.Errorf("pickfirst is not in effect after 1 second, EmptyCall() = _, %v, want _, %v", err, servers[0].port)
}
// The following RPCs should all succeed with the first server.
for i := 0; i < 3; i++ {
err = Invoke(context.Background(), "/foo/bar", &req, &reply, cc)
if ErrorDesc(err) != servers[0].port {
return fmt.Errorf("Index %d: want peer %v, got peer %v", i, servers[0].port, err)
}
}
return nil
}
func checkRoundRobin(cc *ClientConn, servers []*server) error {
var (
req = "port"
reply string
err error
)
// Make sure connections to all servers are up.
for i := 0; i < 2; i++ {
// Do this check twice, otherwise the first RPC's transport may still be
// picked by the closing pickfirst balancer, and the test becomes flaky.
for _, s := range servers {
var up bool
for i := 0; i < 1000; i++ {
if err = Invoke(context.Background(), "/foo/bar", &req, &reply, cc); ErrorDesc(err) == s.port {
up = true
break
}
time.Sleep(time.Millisecond)
}
if !up {
return fmt.Errorf("server %v is not up within 1 second", s.port)
}
}
}
serverCount := len(servers)
for i := 0; i < 3*serverCount; i++ {
err = Invoke(context.Background(), "/foo/bar", &req, &reply, cc)
if ErrorDesc(err) != servers[i%serverCount].port {
return fmt.Errorf("Index %d: want peer %v, got peer %v", i, servers[i%serverCount].port, err)
}
}
return nil
}
func TestSwitchBalancer(t *testing.T) {
defer leakcheck.Check(t)
r, rcleanup := manual.GenerateAndRegisterManualResolver()
defer rcleanup()
numServers := 2
servers, _, scleanup := startServers(t, numServers, math.MaxInt32)
defer scleanup()
cc, err := Dial(r.Scheme()+":///test.server", WithInsecure(), WithCodec(testCodec{}))
if err != nil {
t.Fatalf("failed to dial: %v", err)
}
defer cc.Close()
r.NewAddress([]resolver.Address{{Addr: servers[0].addr}, {Addr: servers[1].addr}})
// The default balancer is pickfirst.
if err := checkPickFirst(cc, servers); err != nil {
t.Fatalf("check pickfirst returned non-nil error: %v", err)
}
// Switch to roundrobin.
cc.switchBalancer("roundrobin")
if err := checkRoundRobin(cc, servers); err != nil {
t.Fatalf("check roundrobin returned non-nil error: %v", err)
}
// Switch to pickfirst.
cc.switchBalancer("pickfirst")
if err := checkPickFirst(cc, servers); err != nil {
t.Fatalf("check pickfirst returned non-nil error: %v", err)
}
}