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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 (
"context"
"errors"
"fmt"
"net"
"strings"
"testing"
"time"
"google.golang.org/grpc/balancer"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/internal/balancer/stub"
"google.golang.org/grpc/resolver"
"google.golang.org/grpc/resolver/manual"
"google.golang.org/grpc/serviceconfig"
"google.golang.org/grpc/status"
)
// The target string with unknown scheme should be kept unchanged and passed to
// the dialer.
func (s) TestDialParseTargetUnknownScheme(t *testing.T) {
for _, test := range []struct {
targetStr string
want string
}{
{"/unix/socket/address", "/unix/socket/address"},
// For known scheme.
{"passthrough://a.server.com/google.com", "google.com"},
} {
dialStrCh := make(chan string, 1)
cc, err := Dial(test.targetStr, WithInsecure(), WithDialer(func(addr string, _ time.Duration) (net.Conn, error) {
select {
case dialStrCh <- addr:
default:
}
return nil, fmt.Errorf("test dialer, always error")
}))
if err != nil {
t.Fatalf("Failed to create ClientConn: %v", err)
}
got := <-dialStrCh
cc.Close()
if got != test.want {
t.Errorf("Dial(%q), dialer got %q, want %q", test.targetStr, got, test.want)
}
}
}
func testResolverErrorPolling(t *testing.T, badUpdate func(*manual.Resolver), goodUpdate func(*manual.Resolver), dopts ...DialOption) {
boIter := make(chan int)
resolverBackoff := func(v int) time.Duration {
boIter <- v
return 0
}
r := manual.NewBuilderWithScheme("whatever")
rn := make(chan struct{})
defer func() { close(rn) }()
r.ResolveNowCallback = func(resolver.ResolveNowOptions) { rn <- struct{}{} }
defaultDialOptions := []DialOption{
WithInsecure(),
WithResolvers(r),
withResolveNowBackoff(resolverBackoff),
}
cc, err := Dial(r.Scheme()+":///test.server", append(defaultDialOptions, dopts...)...)
if err != nil {
t.Fatalf("Dial(_, _) = _, %v; want _, nil", err)
}
defer cc.Close()
badUpdate(r)
panicAfter := time.AfterFunc(5*time.Second, func() { panic("timed out polling resolver") })
defer panicAfter.Stop()
// Ensure ResolveNow is called, then Backoff with the right parameter, several times
for i := 0; i < 7; i++ {
<-rn
if v := <-boIter; v != i {
t.Errorf("Backoff call %v uses value %v", i, v)
}
}
// UpdateState will block if ResolveNow is being called (which blocks on
// rn), so call it in a goroutine.
goodUpdate(r)
// Wait awhile to ensure ResolveNow and Backoff stop being called when the
// state is OK (i.e. polling was cancelled).
for {
t := time.NewTimer(50 * time.Millisecond)
select {
case <-rn:
// ClientConn is still calling ResolveNow
<-boIter
time.Sleep(5 * time.Millisecond)
continue
case <-t.C:
// ClientConn stopped calling ResolveNow; success
}
break
}
}
const happyBalancerName = "happy balancer"
func init() {
// Register a balancer that never returns an error from
// UpdateClientConnState, and doesn't do anything else either.
bf := stub.BalancerFuncs{
UpdateClientConnState: func(*stub.BalancerData, balancer.ClientConnState) error {
return nil
},
}
stub.Register(happyBalancerName, bf)
}
// TestResolverErrorPolling injects resolver errors and verifies ResolveNow is
// called with the appropriate backoff strategy being consulted between
// ResolveNow calls.
func (s) TestResolverErrorPolling(t *testing.T) {
testResolverErrorPolling(t, func(r *manual.Resolver) {
r.CC.ReportError(errors.New("res err"))
}, func(r *manual.Resolver) {
// UpdateState will block if ResolveNow is being called (which blocks on
// rn), so call it in a goroutine.
go r.CC.UpdateState(resolver.State{})
},
WithDefaultServiceConfig(fmt.Sprintf(`{ "loadBalancingConfig": [{"%v": {}}] }`, happyBalancerName)))
}
// TestServiceConfigErrorPolling injects a service config error and verifies
// ResolveNow is called with the appropriate backoff strategy being consulted
// between ResolveNow calls.
func (s) TestServiceConfigErrorPolling(t *testing.T) {
testResolverErrorPolling(t, func(r *manual.Resolver) {
badsc := r.CC.ParseServiceConfig("bad config")
r.UpdateState(resolver.State{ServiceConfig: badsc})
}, func(r *manual.Resolver) {
// UpdateState will block if ResolveNow is being called (which blocks on
// rn), so call it in a goroutine.
go r.CC.UpdateState(resolver.State{})
},
WithDefaultServiceConfig(fmt.Sprintf(`{ "loadBalancingConfig": [{"%v": {}}] }`, happyBalancerName)))
}
// TestResolverErrorInBuild makes the resolver.Builder call into the ClientConn
// during the Build call. We use two separate mutexes in the code which make
// sure there is no data race in this code path, and also that there is no
// deadlock.
func (s) TestResolverErrorInBuild(t *testing.T) {
r := manual.NewBuilderWithScheme("whatever")
r.InitialState(resolver.State{ServiceConfig: &serviceconfig.ParseResult{Err: errors.New("resolver build err")}})
cc, err := Dial(r.Scheme()+":///test.server", WithInsecure(), WithResolvers(r))
if err != nil {
t.Fatalf("Dial(_, _) = _, %v; want _, nil", err)
}
defer cc.Close()
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
var dummy int
const wantMsg = "error parsing service config"
const wantCode = codes.Unavailable
if err := cc.Invoke(ctx, "/foo/bar", &dummy, &dummy); status.Code(err) != wantCode || !strings.Contains(status.Convert(err).Message(), wantMsg) {
t.Fatalf("cc.Invoke(_, _, _, _) = %v; want status.Code()==%v, status.Message() contains %q", err, wantCode, wantMsg)
}
}
func (s) TestServiceConfigErrorRPC(t *testing.T) {
r := manual.NewBuilderWithScheme("whatever")
cc, err := Dial(r.Scheme()+":///test.server", WithInsecure(), WithResolvers(r))
if err != nil {
t.Fatalf("Dial(_, _) = _, %v; want _, nil", err)
}
defer cc.Close()
badsc := r.CC.ParseServiceConfig("bad config")
r.UpdateState(resolver.State{ServiceConfig: badsc})
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
var dummy int
const wantMsg = "error parsing service config"
const wantCode = codes.Unavailable
if err := cc.Invoke(ctx, "/foo/bar", &dummy, &dummy); status.Code(err) != wantCode || !strings.Contains(status.Convert(err).Message(), wantMsg) {
t.Fatalf("cc.Invoke(_, _, _, _) = %v; want status.Code()==%v, status.Message() contains %q", err, wantCode, wantMsg)
}
}