blob: d6e8c36361bed33b10823866e3ef8d958628d052 [file] [log] [blame]
/*
*
* 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 (
"context"
"fmt"
"sync/atomic"
"testing"
"time"
"google.golang.org/grpc/balancer"
"google.golang.org/grpc/connectivity"
_ "google.golang.org/grpc/grpclog/glogger"
"google.golang.org/grpc/internal/transport"
)
const goroutineCount = 5
var (
testT = &testTransport{}
testSC = &acBalancerWrapper{ac: &addrConn{
state: connectivity.Ready,
transport: testT,
}}
testSCNotReady = &acBalancerWrapper{ac: &addrConn{
state: connectivity.TransientFailure,
}}
)
type testTransport struct {
transport.ClientTransport
}
type testingPicker struct {
err error
sc balancer.SubConn
maxCalled int64
}
func (p *testingPicker) Pick(ctx context.Context, opts balancer.PickOptions) (balancer.SubConn, func(balancer.DoneInfo), error) {
if atomic.AddInt64(&p.maxCalled, -1) < 0 {
return nil, nil, fmt.Errorf("pick called to many times (> goroutineCount)")
}
if p.err != nil {
return nil, nil, p.err
}
return p.sc, nil, nil
}
func (s) TestBlockingPickTimeout(t *testing.T) {
bp := newPickerWrapper()
ctx, cancel := context.WithTimeout(context.Background(), time.Millisecond)
defer cancel()
if _, _, err := bp.pick(ctx, true, balancer.PickOptions{}); err != context.DeadlineExceeded {
t.Errorf("bp.pick returned error %v, want DeadlineExceeded", err)
}
}
func (s) TestBlockingPick(t *testing.T) {
bp := newPickerWrapper()
// All goroutines should block because picker is nil in bp.
var finishedCount uint64
for i := goroutineCount; i > 0; i-- {
go func() {
if tr, _, err := bp.pick(context.Background(), true, balancer.PickOptions{}); err != nil || tr != testT {
t.Errorf("bp.pick returned non-nil error: %v", err)
}
atomic.AddUint64(&finishedCount, 1)
}()
}
time.Sleep(50 * time.Millisecond)
if c := atomic.LoadUint64(&finishedCount); c != 0 {
t.Errorf("finished goroutines count: %v, want 0", c)
}
bp.updatePicker(&testingPicker{sc: testSC, maxCalled: goroutineCount})
}
func (s) TestBlockingPickNoSubAvailable(t *testing.T) {
bp := newPickerWrapper()
var finishedCount uint64
bp.updatePicker(&testingPicker{err: balancer.ErrNoSubConnAvailable, maxCalled: goroutineCount})
// All goroutines should block because picker returns no sc available.
for i := goroutineCount; i > 0; i-- {
go func() {
if tr, _, err := bp.pick(context.Background(), true, balancer.PickOptions{}); err != nil || tr != testT {
t.Errorf("bp.pick returned non-nil error: %v", err)
}
atomic.AddUint64(&finishedCount, 1)
}()
}
time.Sleep(50 * time.Millisecond)
if c := atomic.LoadUint64(&finishedCount); c != 0 {
t.Errorf("finished goroutines count: %v, want 0", c)
}
bp.updatePicker(&testingPicker{sc: testSC, maxCalled: goroutineCount})
}
func (s) TestBlockingPickTransientWaitforready(t *testing.T) {
bp := newPickerWrapper()
bp.updatePicker(&testingPicker{err: balancer.ErrTransientFailure, maxCalled: goroutineCount})
var finishedCount uint64
// All goroutines should block because picker returns transientFailure and
// picks are not failfast.
for i := goroutineCount; i > 0; i-- {
go func() {
if tr, _, err := bp.pick(context.Background(), false, balancer.PickOptions{}); err != nil || tr != testT {
t.Errorf("bp.pick returned non-nil error: %v", err)
}
atomic.AddUint64(&finishedCount, 1)
}()
}
time.Sleep(time.Millisecond)
if c := atomic.LoadUint64(&finishedCount); c != 0 {
t.Errorf("finished goroutines count: %v, want 0", c)
}
bp.updatePicker(&testingPicker{sc: testSC, maxCalled: goroutineCount})
}
func (s) TestBlockingPickSCNotReady(t *testing.T) {
bp := newPickerWrapper()
bp.updatePicker(&testingPicker{sc: testSCNotReady, maxCalled: goroutineCount})
var finishedCount uint64
// All goroutines should block because sc is not ready.
for i := goroutineCount; i > 0; i-- {
go func() {
if tr, _, err := bp.pick(context.Background(), true, balancer.PickOptions{}); err != nil || tr != testT {
t.Errorf("bp.pick returned non-nil error: %v", err)
}
atomic.AddUint64(&finishedCount, 1)
}()
}
time.Sleep(time.Millisecond)
if c := atomic.LoadUint64(&finishedCount); c != 0 {
t.Errorf("finished goroutines count: %v, want 0", c)
}
bp.updatePicker(&testingPicker{sc: testSC, maxCalled: goroutineCount})
}