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client.go
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client.go
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/*
*
* Copyright 2020 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.
*
*/
// Binary client for xDS interop tests.
package main
import (
"context"
"flag"
"fmt"
"log"
"net"
"strings"
"sync"
"sync/atomic"
"time"
"google.golang.org/grpc"
"google.golang.org/grpc/grpclog"
testpb "google.golang.org/grpc/interop/grpc_testing"
"google.golang.org/grpc/metadata"
"google.golang.org/grpc/peer"
_ "google.golang.org/grpc/xds"
)
type statsWatcherKey struct {
startID int32
endID int32
}
// rpcInfo contains the rpc type and the hostname where the response is received
// from.
type rpcInfo struct {
typ string
hostname string
}
type statsWatcher struct {
rpcsByPeer map[string]int32
rpcsByType map[string]map[string]int32
numFailures int32
remainingRpcs int32
chanHosts chan *rpcInfo
}
func (watcher *statsWatcher) buildResp() *testpb.LoadBalancerStatsResponse {
rpcsByType := make(map[string]*testpb.LoadBalancerStatsResponse_RpcsByPeer, len(watcher.rpcsByType))
for t, rpcsByPeer := range watcher.rpcsByType {
rpcsByType[t] = &testpb.LoadBalancerStatsResponse_RpcsByPeer{
RpcsByPeer: rpcsByPeer,
}
}
return &testpb.LoadBalancerStatsResponse{
NumFailures: watcher.numFailures + watcher.remainingRpcs,
RpcsByPeer: watcher.rpcsByPeer,
RpcsByMethod: rpcsByType,
}
}
var (
failOnFailedRPC = flag.Bool("fail_on_failed_rpc", false, "Fail client if any RPCs fail after first success")
numChannels = flag.Int("num_channels", 1, "Num of channels")
printResponse = flag.Bool("print_response", false, "Write RPC response to stdout")
qps = flag.Int("qps", 1, "QPS per channel, for each type of RPC")
rpc = flag.String("rpc", "UnaryCall", "Types of RPCs to make, ',' separated string. RPCs can be EmptyCall or UnaryCall")
rpcMetadata = flag.String("metadata", "", "The metadata to send with RPC, in format EmptyCall:key1:value1,UnaryCall:key2:value2")
rpcTimeout = flag.Duration("rpc_timeout", 20*time.Second, "Per RPC timeout")
server = flag.String("server", "localhost:8080", "Address of server to connect to")
statsPort = flag.Int("stats_port", 8081, "Port to expose peer distribution stats service")
mu sync.Mutex
currentRequestID int32
watchers = make(map[statsWatcherKey]*statsWatcher)
// 0 or 1 representing an RPC has succeeded. Use hasRPCSucceeded and
// setRPCSucceeded to access in a safe manner.
rpcSucceeded uint32
)
type statsService struct {
testpb.UnimplementedLoadBalancerStatsServiceServer
}
func hasRPCSucceeded() bool {
return atomic.LoadUint32(&rpcSucceeded) > 0
}
func setRPCSucceeded() {
atomic.StoreUint32(&rpcSucceeded, 1)
}
// Wait for the next LoadBalancerStatsRequest.GetNumRpcs to start and complete,
// and return the distribution of remote peers. This is essentially a clientside
// LB reporting mechanism that is designed to be queried by an external test
// driver when verifying that the client is distributing RPCs as expected.
func (s *statsService) GetClientStats(ctx context.Context, in *testpb.LoadBalancerStatsRequest) (*testpb.LoadBalancerStatsResponse, error) {
mu.Lock()
watcherKey := statsWatcherKey{currentRequestID, currentRequestID + in.GetNumRpcs()}
watcher, ok := watchers[watcherKey]
if !ok {
watcher = &statsWatcher{
rpcsByPeer: make(map[string]int32),
rpcsByType: make(map[string]map[string]int32),
numFailures: 0,
remainingRpcs: in.GetNumRpcs(),
chanHosts: make(chan *rpcInfo),
}
watchers[watcherKey] = watcher
}
mu.Unlock()
ctx, cancel := context.WithTimeout(ctx, time.Duration(in.GetTimeoutSec())*time.Second)
defer cancel()
defer func() {
mu.Lock()
delete(watchers, watcherKey)
mu.Unlock()
}()
// Wait until the requested RPCs have all been recorded or timeout occurs.
for {
select {
case info := <-watcher.chanHosts:
if info != nil {
watcher.rpcsByPeer[info.hostname]++
rpcsByPeerForType := watcher.rpcsByType[info.typ]
if rpcsByPeerForType == nil {
rpcsByPeerForType = make(map[string]int32)
watcher.rpcsByType[info.typ] = rpcsByPeerForType
}
rpcsByPeerForType[info.hostname]++
} else {
watcher.numFailures++
}
watcher.remainingRpcs--
if watcher.remainingRpcs == 0 {
return watcher.buildResp(), nil
}
case <-ctx.Done():
grpclog.Info("Timed out, returning partial stats")
return watcher.buildResp(), nil
}
}
}
const (
unaryCall string = "UnaryCall"
emptyCall string = "EmptyCall"
)
func parseRPCTypes(rpcStr string) (ret []string) {
if len(rpcStr) == 0 {
return []string{unaryCall}
}
rpcs := strings.Split(rpcStr, ",")
for _, r := range rpcs {
switch r {
case unaryCall, emptyCall:
ret = append(ret, r)
default:
flag.PrintDefaults()
log.Fatalf("unsupported RPC type: %v", r)
}
}
return
}
type rpcConfig struct {
typ string
md metadata.MD
}
// parseRPCMetadata turns EmptyCall:key1:value1 into
// {typ: emptyCall, md: {key1:value1}}.
func parseRPCMetadata(rpcMetadataStr string, rpcs []string) []*rpcConfig {
rpcMetadataSplit := strings.Split(rpcMetadataStr, ",")
rpcsToMD := make(map[string][]string)
for _, rm := range rpcMetadataSplit {
rmSplit := strings.Split(rm, ":")
if len(rmSplit)%2 != 1 {
log.Fatalf("invalid metadata config %v, want EmptyCall:key1:value1", rm)
}
rpcsToMD[rmSplit[0]] = append(rpcsToMD[rmSplit[0]], rmSplit[1:]...)
}
ret := make([]*rpcConfig, 0, len(rpcs))
for _, rpcT := range rpcs {
rpcC := &rpcConfig{
typ: rpcT,
}
if md := rpcsToMD[string(rpcT)]; len(md) > 0 {
rpcC.md = metadata.Pairs(md...)
}
ret = append(ret, rpcC)
}
return ret
}
func main() {
flag.Parse()
rpcCfgs := parseRPCMetadata(*rpcMetadata, parseRPCTypes(*rpc))
lis, err := net.Listen("tcp", fmt.Sprintf(":%d", *statsPort))
if err != nil {
grpclog.Fatalf("failed to listen: %v", err)
}
s := grpc.NewServer()
defer s.Stop()
testpb.RegisterLoadBalancerStatsServiceServer(s, &statsService{})
go s.Serve(lis)
clients := make([]testpb.TestServiceClient, *numChannels)
for i := 0; i < *numChannels; i++ {
conn, err := grpc.DialContext(context.Background(), *server, grpc.WithInsecure())
if err != nil {
grpclog.Fatalf("Fail to dial: %v", err)
}
defer conn.Close()
clients[i] = testpb.NewTestServiceClient(conn)
}
ticker := time.NewTicker(time.Second / time.Duration(*qps**numChannels))
defer ticker.Stop()
sendRPCs(clients, rpcCfgs, ticker)
}
func makeOneRPC(c testpb.TestServiceClient, cfg *rpcConfig) (*peer.Peer, *rpcInfo, error) {
ctx, cancel := context.WithTimeout(context.Background(), *rpcTimeout)
defer cancel()
if len(cfg.md) != 0 {
ctx = metadata.NewOutgoingContext(ctx, cfg.md)
}
info := rpcInfo{typ: cfg.typ}
var (
p peer.Peer
header metadata.MD
err error
)
switch cfg.typ {
case unaryCall:
var resp *testpb.SimpleResponse
resp, err = c.UnaryCall(ctx, &testpb.SimpleRequest{FillServerId: true}, grpc.Peer(&p), grpc.Header(&header))
// For UnaryCall, also read hostname from response, in case the server
// isn't updated to send headers.
if resp != nil {
info.hostname = resp.Hostname
}
case emptyCall:
_, err = c.EmptyCall(ctx, &testpb.Empty{}, grpc.Peer(&p), grpc.Header(&header))
}
if err != nil {
return nil, nil, err
}
hosts := header["hostname"]
if len(hosts) > 0 {
info.hostname = hosts[0]
}
return &p, &info, err
}
func sendRPCs(clients []testpb.TestServiceClient, cfgs []*rpcConfig, ticker *time.Ticker) {
var i int
for range ticker.C {
go func(i int) {
// Get and increment request ID, and save a list of watchers that
// are interested in this RPC.
mu.Lock()
savedRequestID := currentRequestID
currentRequestID++
savedWatchers := []*statsWatcher{}
for key, value := range watchers {
if key.startID <= savedRequestID && savedRequestID < key.endID {
savedWatchers = append(savedWatchers, value)
}
}
mu.Unlock()
c := clients[i]
for _, cfg := range cfgs {
p, info, err := makeOneRPC(c, cfg)
for _, watcher := range savedWatchers {
// This sends an empty string if the RPC failed.
watcher.chanHosts <- info
}
if err != nil && *failOnFailedRPC && hasRPCSucceeded() {
grpclog.Fatalf("RPC failed: %v", err)
}
if err == nil {
setRPCSucceeded()
}
if *printResponse {
if err == nil {
if cfg.typ == unaryCall {
// Need to keep this format, because some tests are
// relying on stdout.
fmt.Printf("Greeting: Hello world, this is %s, from %v\n", info.hostname, p.Addr)
} else {
fmt.Printf("RPC %q, from host %s, addr %v\n", cfg.typ, info.hostname, p.Addr)
}
} else {
fmt.Printf("RPC %q, failed with %v\n", cfg.typ, err)
}
}
}
}(i)
i = (i + 1) % len(clients)
}
}