// Dial establishes a connection for a given endpoint using the client's config
func (c *Client) Dial(endpoint string) (*grpc.ClientConn, error) {
opts := []grpc.DialOption{
grpc.WithBlock(),
grpc.WithTimeout(c.cfg.DialTimeout),
}
if c.creds != nil {
opts = append(opts, grpc.WithTransportCredentials(*c.creds))
} else {
opts = append(opts, grpc.WithInsecure())
}
if url, uerr := url.Parse(endpoint); uerr == nil && url.Scheme == "unix" {
f := func(a string, t time.Duration) (net.Conn, error) {
return net.DialTimeout("unix", a, t)
}
// strip unix:// prefix so certs work
endpoint = url.Host
opts = append(opts, grpc.WithDialer(f))
}
conn, err := grpc.Dial(endpoint, opts...)
if err != nil {
return nil, err
}
return conn, nil
}
// NewClientConn creates a gRPC client connection to addr.
func NewClientConn(addr string) *grpc.ClientConn {
conn, err := grpc.Dial(addr, grpc.WithInsecure())
if err != nil {
grpclog.Fatalf("NewClientConn(%q) failed to create a ClientConn %v", addr, err)
}
return conn
}
// deleteRangeCommandFunc executes the "delegeRange" command.
func deleteRangeCommandFunc(c *cli.Context) {
if len(c.Args()) == 0 {
panic("bad arg")
}
var rangeEnd []byte
key := []byte(c.Args()[0])
if len(c.Args()) > 1 {
rangeEnd = []byte(c.Args()[1])
}
conn, err := grpc.Dial(c.GlobalString("endpoint"), grpc.WithInsecure())
if err != nil {
panic(err)
}
etcd := pb.NewEtcdClient(conn)
req := &pb.DeleteRangeRequest{Key: key, RangeEnd: rangeEnd}
etcd.DeleteRange(context.Background(), req)
if rangeEnd != nil {
fmt.Printf("range [%s, %s) is deleted\n", string(key), string(rangeEnd))
} else {
fmt.Printf("key %s is deleted\n", string(key))
}
}
// checkConsistency stops the cluster for a moment and get the hashes of KV storages.
func (c *cluster) checkConsistency() error {
hashes := make(map[string]uint32)
for _, u := range c.GRPCURLs {
conn, err := grpc.Dial(u, grpc.WithInsecure(), grpc.WithTimeout(5*time.Second))
if err != nil {
return err
}
kvc := pb.NewKVClient(conn)
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
resp, err := kvc.Hash(ctx, &pb.HashRequest{})
hv := resp.Hash
if resp != nil && err != nil {
return err
}
cancel()
hashes[u] = hv
}
if !checkConsistency(hashes) {
return fmt.Errorf("check consistency fails: %v", hashes)
}
return nil
}
// NewClientV3 creates a new grpc client connection to the member
func NewClientV3(m *member) (*clientv3.Client, error) {
if m.grpcAddr == "" {
return nil, fmt.Errorf("member not configured for grpc")
}
f := func(a string, t time.Duration) (net.Conn, error) {
return net.Dial("unix", a)
}
unixdialer := grpc.WithDialer(f)
opts := []grpc.DialOption{
unixdialer,
grpc.WithBlock(),
grpc.WithTimeout(5 * time.Second)}
if m.ClientTLSInfo != nil {
tlscfg, err := m.ClientTLSInfo.ClientConfig()
if err != nil {
return nil, err
}
creds := credentials.NewTLS(tlscfg)
opts = append(opts, grpc.WithTransportCredentials(creds))
} else {
opts = append(opts, grpc.WithInsecure())
}
conn, err := grpc.Dial(m.grpcAddr, opts...)
if err != nil {
return nil, err
}
return clientv3.NewFromConn(conn), nil
}
// Dial establishes a connection for a given endpoint using the client's config
func (c *Client) Dial(endpoint string) (*grpc.ClientConn, error) {
opts := []grpc.DialOption{
grpc.WithBlock(),
grpc.WithTimeout(c.cfg.DialTimeout),
}
if c.creds != nil {
opts = append(opts, grpc.WithTransportCredentials(*c.creds))
} else {
opts = append(opts, grpc.WithInsecure())
}
proto := "tcp"
if url, uerr := url.Parse(endpoint); uerr == nil && url.Scheme == "unix" {
proto = "unix"
// strip unix:// prefix so certs work
endpoint = url.Host
}
f := func(a string, t time.Duration) (net.Conn, error) {
select {
case <-c.ctx.Done():
return nil, c.ctx.Err()
default:
}
return net.DialTimeout(proto, a, t)
}
opts = append(opts, grpc.WithDialer(f))
conn, err := grpc.Dial(endpoint, opts...)
if err != nil {
return nil, err
}
return conn, nil
}
// txnCommandFunc executes the "txn" command.
func txnCommandFunc(c *cli.Context) {
if len(c.Args()) != 0 {
panic("unexpected args")
}
reader := bufio.NewReader(os.Stdin)
next := compareState
txn := &pb.TxnRequest{}
for next != nil {
next = next(txn, reader)
}
conn, err := grpc.Dial(c.GlobalString("endpoint"), grpc.WithInsecure())
if err != nil {
panic(err)
}
etcd := pb.NewEtcdClient(conn)
resp, err := etcd.Txn(context.Background(), txn)
if err != nil {
fmt.Println(err)
}
if resp.Succeeded {
fmt.Println("executed success request list")
} else {
fmt.Println("executed failure request list")
}
}
// newGrpcClient creates a new grpc client connection to the member
func NewGRPCClient(m *member) (*grpc.ClientConn, error) {
if m.grpcAddr == "" {
return nil, fmt.Errorf("member not configured for grpc")
}
f := func(a string, t time.Duration) (net.Conn, error) {
return net.Dial("unix", a)
}
unixdialer := grpc.WithDialer(f)
return grpc.Dial(m.grpcAddr, grpc.WithInsecure(), unixdialer)
}
func (s *stresser) Stress() error {
conn, err := grpc.Dial(s.Endpoint, grpc.WithInsecure(), grpc.WithTimeout(5*time.Second))
if err != nil {
return fmt.Errorf("%v (%s)", err, s.Endpoint)
}
defer conn.Close()
ctx, cancel := context.WithCancel(context.Background())
wg := &sync.WaitGroup{}
wg.Add(s.N)
s.mu.Lock()
s.conn = conn
s.cancel = cancel
s.wg = wg
s.mu.Unlock()
kvc := pb.NewKVClient(conn)
for i := 0; i < s.N; i++ {
go func(i int) {
defer wg.Done()
for {
// TODO: 10-second is enough timeout to cover leader failure
// and immediate leader election. Find out what other cases this
// could be timed out.
putctx, putcancel := context.WithTimeout(ctx, 10*time.Second)
_, err := kvc.Put(putctx, &pb.PutRequest{
Key: []byte(fmt.Sprintf("foo%d", rand.Intn(s.KeySuffixRange))),
Value: []byte(randStr(s.KeySize)),
})
putcancel()
if err != nil {
if grpc.ErrorDesc(err) == context.DeadlineExceeded.Error() {
// This retries when request is triggered at the same time as
// leader failure. When we terminate the leader, the request to
// that leader cannot be processed, and times out. Also requests
// to followers cannot be forwarded to the old leader, so timing out
// as well. We want to keep stressing until the cluster elects a
// new leader and start processing requests again.
continue
}
return
}
s.mu.Lock()
s.success++
s.mu.Unlock()
}
}(i)
}
<-ctx.Done()
return nil
}
// Dial establishes a connection for a given endpoint using the client's config
func (c *Client) Dial(endpoint string) (*grpc.ClientConn, error) {
// TODO: enable grpc.WithTransportCredentials(creds)
conn, err := grpc.Dial(
endpoint,
grpc.WithBlock(),
grpc.WithTimeout(c.cfg.DialTimeout),
grpc.WithInsecure())
if err != nil {
return nil, err
}
return conn, nil
}
// NewClientV3 creates a new grpc client connection to the member
func NewClientV3(m *member) (*clientv3.Client, error) {
if m.grpcAddr == "" {
return nil, fmt.Errorf("member not configured for grpc")
}
f := func(a string, t time.Duration) (net.Conn, error) {
return net.Dial("unix", a)
}
unixdialer := grpc.WithDialer(f)
conn, err := grpc.Dial(m.grpcAddr, grpc.WithInsecure(), unixdialer)
if err != nil {
return nil, err
}
return clientv3.NewFromConn(conn), nil
}
func clientSetUp(t *testing.T, addr string, cg grpc.CompressorGenerator, dg grpc.DecompressorGenerator, ua string, e env) (cc *grpc.ClientConn) {
var derr error
if e.security == "tls" {
creds, err := credentials.NewClientTLSFromFile(tlsDir+"ca.pem", "x.test.youtube.com")
if err != nil {
t.Fatalf("Failed to create credentials %v", err)
}
cc, derr = grpc.Dial(addr, grpc.WithTransportCredentials(creds), grpc.WithDialer(e.dialer), grpc.WithUserAgent(ua), grpc.WithCompressor(cg), grpc.WithDecompressor(dg))
} else {
cc, derr = grpc.Dial(addr, grpc.WithDialer(e.dialer), grpc.WithInsecure(), grpc.WithUserAgent(ua), grpc.WithCompressor(cg), grpc.WithDecompressor(dg))
}
if derr != nil {
t.Fatalf("Dial(%q) = %v", addr, derr)
}
return
}
// setHealthKey sets health key on all given urls.
func setHealthKey(us []string) error {
for _, u := range us {
conn, err := grpc.Dial(u, grpc.WithInsecure(), grpc.WithTimeout(5*time.Second))
if err != nil {
return fmt.Errorf("%v (%s)", err, u)
}
ctx, cancel := context.WithTimeout(context.Background(), time.Second)
kvc := pb.NewKVClient(conn)
_, err = kvc.Put(ctx, &pb.PutRequest{Key: []byte("health"), Value: []byte("good")})
cancel()
if err != nil {
return err
}
}
return nil
}
// Dial establishes a connection for a given endpoint using the client's config
func (c *Client) Dial(endpoint string) (*grpc.ClientConn, error) {
opts := []grpc.DialOption{
grpc.WithBlock(),
grpc.WithTimeout(c.cfg.DialTimeout),
}
if c.creds != nil {
opts = append(opts, grpc.WithTransportCredentials(*c.creds))
} else {
opts = append(opts, grpc.WithInsecure())
}
conn, err := grpc.Dial(endpoint, opts...)
if err != nil {
return nil, err
}
return conn, nil
}
// putCommandFunc executes the "put" command.
func putCommandFunc(c *cli.Context) {
if len(c.Args()) != 2 {
panic("bad arg")
}
key := []byte(c.Args()[0])
value := []byte(c.Args()[1])
conn, err := grpc.Dial(c.GlobalString("endpoint"), grpc.WithInsecure())
if err != nil {
panic(err)
}
etcd := pb.NewEtcdClient(conn)
req := &pb.PutRequest{Key: key, Value: value}
etcd.Put(context.Background(), req)
fmt.Printf("%s %s\n", key, value)
}
func (c *cluster) getRevision() (map[string]int64, error) {
revs := make(map[string]int64)
for _, u := range c.GRPCURLs {
conn, err := grpc.Dial(u, grpc.WithInsecure(), grpc.WithTimeout(5*time.Second))
if err != nil {
return nil, err
}
kvc := pb.NewKVClient(conn)
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
resp, err := kvc.Range(ctx, &pb.RangeRequest{Key: []byte("foo")})
if err != nil {
return nil, err
}
cancel()
revs[u] = resp.Header.Revision
}
return revs, nil
}
func (c *cluster) getKVHash() (map[string]int64, error) {
hashes := make(map[string]int64)
for _, u := range c.GRPCURLs {
conn, err := grpc.Dial(u, grpc.WithInsecure(), grpc.WithTimeout(5*time.Second))
if err != nil {
return nil, err
}
kvc := pb.NewKVClient(conn)
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
resp, err := kvc.Hash(ctx, &pb.HashRequest{})
if resp != nil && err != nil {
return nil, err
}
cancel()
hashes[u] = int64(resp.Hash)
}
return hashes, nil
}
func main() {
flag.Parse()
var opts []grpc.DialOption
if *tls {
var sn string
if *serverHostOverride != "" {
sn = *serverHostOverride
}
var creds credentials.TransportAuthenticator
if *caFile != "" {
var err error
creds, err = credentials.NewClientTLSFromFile(*caFile, sn)
if err != nil {
grpclog.Fatalf("Failed to create TLS credentials %v", err)
}
} else {
creds = credentials.NewClientTLSFromCert(nil, sn)
}
opts = append(opts, grpc.WithTransportCredentials(creds))
} else {
opts = append(opts, grpc.WithInsecure())
}
conn, err := grpc.Dial(*serverAddr, opts...)
if err != nil {
grpclog.Fatalf("fail to dial: %v", err)
}
defer conn.Close()
client := pb.NewRouteGuideClient(conn)
// Looking for a valid feature
printFeature(client, &pb.Point{409146138, -746188906})
// Feature missing.
printFeature(client, &pb.Point{0, 0})
// Looking for features between 40, -75 and 42, -73.
printFeatures(client, &pb.Rectangle{&pb.Point{400000000, -750000000}, &pb.Point{420000000, -730000000}})
// RecordRoute
runRecordRoute(client)
// RouteChat
runRouteChat(client)
}
func TestReconnectTimeout(t *testing.T) {
lis, err := net.Listen("tcp", ":0")
if err != nil {
t.Fatalf("Failed to listen: %v", err)
}
_, port, err := net.SplitHostPort(lis.Addr().String())
if err != nil {
t.Fatalf("Failed to parse listener address: %v", err)
}
addr := "localhost:" + port
conn, err := grpc.Dial(addr, grpc.WithTimeout(5*time.Second), grpc.WithBlock(), grpc.WithInsecure())
if err != nil {
t.Fatalf("Failed to dial to the server %q: %v", addr, err)
}
// Close unaccepted connection (i.e., conn).
lis.Close()
tc := testpb.NewTestServiceClient(conn)
waitC := make(chan struct{})
go func() {
defer close(waitC)
argSize := 271828
respSize := 314159
payload, err := newPayload(testpb.PayloadType_COMPRESSABLE, int32(argSize))
if err != nil {
t.Fatal(err)
}
req := &testpb.SimpleRequest{
ResponseType: testpb.PayloadType_COMPRESSABLE.Enum(),
ResponseSize: proto.Int32(int32(respSize)),
Payload: payload,
}
if _, err := tc.UnaryCall(context.Background(), req); err == nil {
t.Fatalf("TestService/UnaryCall(_, _) = _, <nil>, want _, non-nil")
}
}()
// Block untill reconnect times out.
<-waitC
if err := conn.Close(); err != grpc.ErrClientConnClosing {
t.Fatalf("%v.Close() = %v, want %v", conn, err, grpc.ErrClientConnClosing)
}
}
// compactionCommandFunc executes the "compaction" command.
func compactionCommandFunc(c *cli.Context) {
if len(c.Args()) != 1 {
panic("bad arg")
}
rev, err := strconv.ParseInt(c.Args()[0], 10, 64)
if err != nil {
panic("bad arg")
}
conn, err := grpc.Dial(c.GlobalString("endpoint"), grpc.WithInsecure())
if err != nil {
panic(err)
}
etcd := pb.NewEtcdClient(conn)
req := &pb.CompactionRequest{Revision: rev}
etcd.Compact(context.Background(), req)
}
func (s *stresser) Stress() error {
conn, err := grpc.Dial(s.Endpoint, grpc.WithInsecure(), grpc.WithTimeout(5*time.Second))
if err != nil {
return fmt.Errorf("%v (%s)", err, s.Endpoint)
}
defer conn.Close()
ctx, cancel := context.WithCancel(context.Background())
wg := &sync.WaitGroup{}
wg.Add(s.N)
s.mu.Lock()
s.conn = conn
s.cancel = cancel
s.wg = wg
s.mu.Unlock()
kvc := pb.NewKVClient(conn)
for i := 0; i < s.N; i++ {
go func(i int) {
defer wg.Done()
for {
putctx, putcancel := context.WithTimeout(ctx, 5*time.Second)
_, err := kvc.Put(putctx, &pb.PutRequest{
Key: []byte(fmt.Sprintf("foo%d", rand.Intn(s.KeySuffixRange))),
Value: []byte(randStr(s.KeySize)),
})
putcancel()
if err != nil {
return
}
s.mu.Lock()
s.success++
s.mu.Unlock()
}
}(i)
}
<-ctx.Done()
return nil
}
func (c *cluster) compactKV(rev int64) error {
var (
conn *grpc.ClientConn
err error
)
for _, u := range c.GRPCURLs {
conn, err = grpc.Dial(u, grpc.WithInsecure(), grpc.WithTimeout(5*time.Second))
if err != nil {
continue
}
kvc := pb.NewKVClient(conn)
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
_, err = kvc.Compact(ctx, &pb.CompactionRequest{Revision: rev})
cancel()
if err == nil {
return nil
}
}
return err
}
func main() {
// Set up a connection to the server.
conn, err := grpc.Dial(address, grpc.WithInsecure())
if err != nil {
log.Fatalf("did not connect: %v", err)
}
defer conn.Close()
c := pb.NewGreeterClient(conn)
// Contact the server and print out its response.
name := defaultName
if len(os.Args) > 1 {
name = os.Args[1]
}
r, err := c.SayHello(context.Background(), &pb.HelloRequest{Name: name})
if err != nil {
log.Fatalf("could not greet: %v", err)
}
log.Printf("Greeting: %s", r.Message)
}
func (s *stresser) Stress() error {
conn, err := grpc.Dial(s.Endpoint, grpc.WithInsecure(), grpc.WithTimeout(5*time.Second))
if err != nil {
return fmt.Errorf("%v (%s)", err, s.Endpoint)
}
ctx, cancel := context.WithCancel(context.Background())
s.mu.Lock()
s.conn = conn
s.cancel = cancel
s.mu.Unlock()
kvc := pb.NewKVClient(conn)
for i := 0; i < s.N; i++ {
go func(i int) {
for {
putctx, putcancel := context.WithTimeout(ctx, 5*time.Second)
_, err := kvc.Put(putctx, &pb.PutRequest{
Key: []byte(fmt.Sprintf("foo%d", rand.Intn(s.KeySuffixRange))),
Value: []byte(randStr(s.KeySize)),
})
putcancel()
if grpc.ErrorDesc(err) == context.Canceled.Error() {
return
}
s.mu.Lock()
if err != nil {
s.failure++
} else {
s.success++
}
s.mu.Unlock()
}
}(i)
}
<-ctx.Done()
return nil
}
// rangeCommandFunc executes the "range" command.
func rangeCommandFunc(c *cli.Context) {
if len(c.Args()) == 0 {
panic("bad arg")
}
var rangeEnd []byte
key := []byte(c.Args()[0])
if len(c.Args()) > 1 {
rangeEnd = []byte(c.Args()[1])
}
conn, err := grpc.Dial(c.GlobalString("endpoint"), grpc.WithInsecure())
if err != nil {
panic(err)
}
etcd := pb.NewEtcdClient(conn)
req := &pb.RangeRequest{Key: key, RangeEnd: rangeEnd}
resp, err := etcd.Range(context.Background(), req)
for _, kv := range resp.Kvs {
fmt.Printf("%s %s\n", string(kv.Key), string(kv.Value))
}
}
func main() {
flag.Parse()
serverAddr := net.JoinHostPort(*serverHost, strconv.Itoa(*serverPort))
var opts []grpc.DialOption
if *useTLS {
var sn string
if *tlsServerName != "" {
sn = *tlsServerName
}
var creds credentials.TransportAuthenticator
if *testCA {
var err error
creds, err = credentials.NewClientTLSFromFile(testCAFile, sn)
if err != nil {
grpclog.Fatalf("Failed to create TLS credentials %v", err)
}
} else {
creds = credentials.NewClientTLSFromCert(nil, sn)
}
opts = append(opts, grpc.WithTransportCredentials(creds))
if *testCase == "compute_engine_creds" {
opts = append(opts, grpc.WithPerRPCCredentials(oauth.NewComputeEngine()))
} else if *testCase == "service_account_creds" {
jwtCreds, err := oauth.NewServiceAccountFromFile(*serviceAccountKeyFile, *oauthScope)
if err != nil {
grpclog.Fatalf("Failed to create JWT credentials: %v", err)
}
opts = append(opts, grpc.WithPerRPCCredentials(jwtCreds))
} else if *testCase == "jwt_token_creds" {
jwtCreds, err := oauth.NewJWTAccessFromFile(*serviceAccountKeyFile)
if err != nil {
grpclog.Fatalf("Failed to create JWT credentials: %v", err)
}
opts = append(opts, grpc.WithPerRPCCredentials(jwtCreds))
} else if *testCase == "oauth2_auth_token" {
opts = append(opts, grpc.WithPerRPCCredentials(oauth.NewOauthAccess(interop.GetToken(*serviceAccountKeyFile, *oauthScope))))
}
} else {
opts = append(opts, grpc.WithInsecure())
}
conn, err := grpc.Dial(serverAddr, opts...)
if err != nil {
grpclog.Fatalf("Fail to dial: %v", err)
}
defer conn.Close()
tc := testpb.NewTestServiceClient(conn)
switch *testCase {
case "empty_unary":
interop.DoEmptyUnaryCall(tc)
case "large_unary":
interop.DoLargeUnaryCall(tc)
case "client_streaming":
interop.DoClientStreaming(tc)
case "server_streaming":
interop.DoServerStreaming(tc)
case "ping_pong":
interop.DoPingPong(tc)
case "empty_stream":
interop.DoEmptyStream(tc)
case "timeout_on_sleeping_server":
interop.DoTimeoutOnSleepingServer(tc)
case "compute_engine_creds":
if !*useTLS {
grpclog.Fatalf("TLS is not enabled. TLS is required to execute compute_engine_creds test case.")
}
interop.DoComputeEngineCreds(tc, *defaultServiceAccount, *oauthScope)
case "service_account_creds":
if !*useTLS {
grpclog.Fatalf("TLS is not enabled. TLS is required to execute service_account_creds test case.")
}
interop.DoServiceAccountCreds(tc, *serviceAccountKeyFile, *oauthScope)
case "jwt_token_creds":
if !*useTLS {
grpclog.Fatalf("TLS is not enabled. TLS is required to execute jwt_token_creds test case.")
}
interop.DoJWTTokenCreds(tc, *serviceAccountKeyFile)
case "per_rpc_creds":
if !*useTLS {
grpclog.Fatalf("TLS is not enabled. TLS is required to execute per_rpc_creds test case.")
}
interop.DoPerRPCCreds(tc, *serviceAccountKeyFile, *oauthScope)
case "oauth2_auth_token":
if !*useTLS {
grpclog.Fatalf("TLS is not enabled. TLS is required to execute oauth2_auth_token test case.")
}
interop.DoOauth2TokenCreds(tc, *serviceAccountKeyFile, *oauthScope)
case "cancel_after_begin":
interop.DoCancelAfterBegin(tc)
case "cancel_after_first_response":
interop.DoCancelAfterFirstResponse(tc)
default:
grpclog.Fatal("Unsupported test case: ", *testCase)
}
}
// Dial establishes a connection for a given endpoint using the client's config
func (c *Client) Dial(endpoint string) (*grpc.ClientConn, error) {
// TODO: enable grpc.WithTransportCredentials(creds)
return grpc.Dial(endpoint, grpc.WithInsecure())
}
func main() {
var c, n int
var url string
flag.IntVar(&c, "c", 50, "number of connections")
flag.IntVar(&n, "n", 200, "number of requests")
// TODO: config the number of concurrency in each connection
flag.StringVar(&url, "u", "127.0.0.1:12379", "etcd server endpoint")
flag.Parse()
if flag.NArg() < 1 {
flag.Usage()
os.Exit(1)
}
if act := flag.Args()[0]; act != "get" {
fmt.Errorf("unsupported action %v", act)
os.Exit(1)
}
var rangeEnd []byte
key := []byte(flag.Args()[1])
if len(flag.Args()) > 2 {
rangeEnd = []byte(flag.Args()[2])
}
results := make(chan *result, n)
bar := pb.New(n)
bar.Format("Bom !")
bar.Start()
start := time.Now()
defer func() {
bar.Finish()
printReport(n, results, time.Now().Sub(start))
}()
var wg sync.WaitGroup
wg.Add(c)
jobs := make(chan struct{}, n)
for i := 0; i < c; i++ {
go func() {
defer wg.Done()
conn, err := grpc.Dial(url, grpc.WithInsecure())
if err != nil {
fmt.Errorf("dial error: %v", err)
os.Exit(1)
}
etcd := etcdserverpb.NewEtcdClient(conn)
req := &etcdserverpb.RangeRequest{Key: key, RangeEnd: rangeEnd}
for _ = range jobs {
st := time.Now()
resp, err := etcd.Range(context.Background(), req)
var errStr string
if err != nil {
errStr = err.Error()
} else {
errStr = resp.Header.Error
}
results <- &result{
errStr: errStr,
duration: time.Now().Sub(st),
}
bar.Increment()
}
}()
}
for i := 0; i < n; i++ {
jobs <- struct{}{}
}
close(jobs)
wg.Wait()
}