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util.go
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util.go
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// Copyright 2015 The etcd 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 cmd
import (
"crypto/rand"
"fmt"
"log"
"os"
"strings"
"github.com/coreos/etcd/clientv3"
"github.com/coreos/etcd/pkg/report"
"golang.org/x/net/context"
)
var (
// dialTotal counts the number of mustCreateConn calls so that endpoint
// connections can be handed out in round-robin order
dialTotal int
// leaderEps is a cache for holding endpoints of a leader node
leaderEps []string
)
func mustFindLeaderEndpoints(c *clientv3.Client) {
resp, lerr := c.MemberList(context.TODO())
if lerr != nil {
fmt.Fprintf(os.Stderr, "failed to get a member list: %s\n", lerr)
os.Exit(1)
}
leaderId := uint64(0)
for _, ep := range c.Endpoints() {
if sresp, serr := c.Status(context.TODO(), ep); serr == nil {
leaderId = sresp.Leader
break
}
}
for _, m := range resp.Members {
if m.ID == leaderId {
leaderEps = m.ClientURLs
return
}
}
fmt.Fprintf(os.Stderr, "failed to find a leader endpoint\n")
os.Exit(1)
}
func mustCreateConn() *clientv3.Client {
connEndpoints := leaderEps
if len(connEndpoints) == 0 {
connEndpoints = []string{endpoints[dialTotal%len(endpoints)]}
dialTotal++
}
cfg := clientv3.Config{
Endpoints: connEndpoints,
DialTimeout: dialTimeout,
}
if !tls.Empty() {
cfgtls, err := tls.ClientConfig()
if err != nil {
fmt.Fprintf(os.Stderr, "bad tls config: %v\n", err)
os.Exit(1)
}
cfg.TLS = cfgtls
}
if len(user) != 0 {
splitted := strings.SplitN(user, ":", 2)
if len(splitted) != 2 {
fmt.Fprintf(os.Stderr, "bad user information: %s\n", user)
os.Exit(1)
}
cfg.Username = splitted[0]
cfg.Password = splitted[1]
}
client, err := clientv3.New(cfg)
if targetLeader && len(leaderEps) == 0 {
mustFindLeaderEndpoints(client)
client.Close()
return mustCreateConn()
}
clientv3.SetLogger(log.New(os.Stderr, "grpc", 0))
if err != nil {
fmt.Fprintf(os.Stderr, "dial error: %v\n", err)
os.Exit(1)
}
return client
}
func mustCreateClients(totalClients, totalConns uint) []*clientv3.Client {
conns := make([]*clientv3.Client, totalConns)
for i := range conns {
conns[i] = mustCreateConn()
}
clients := make([]*clientv3.Client, totalClients)
for i := range clients {
clients[i] = conns[i%int(totalConns)]
}
return clients
}
func mustRandBytes(n int) []byte {
rb := make([]byte, n)
_, err := rand.Read(rb)
if err != nil {
fmt.Fprintf(os.Stderr, "failed to generate value: %v\n", err)
os.Exit(1)
}
return rb
}
func newReport() report.Report {
p := "%4.4f"
if precise {
p = "%g"
}
if sample {
return report.NewReportSample(p)
}
return report.NewReport(p)
}