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cluster.go
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cluster.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 main
import (
"fmt"
"math/rand"
"net"
"strings"
"time"
"golang.org/x/net/context"
pb "github.com/coreos/etcd/etcdserver/etcdserverpb"
"github.com/coreos/etcd/tools/functional-tester/etcd-agent/client"
"google.golang.org/grpc"
)
// agentConfig holds information needed to interact/configure an agent and its etcd process
type agentConfig struct {
endpoint string
clientPort int
peerPort int
failpointPort int
datadir string
}
type cluster struct {
agents []agentConfig
v2Only bool // to be deprecated
stressQPS int
stressKeyLargeSize int
stressKeySize int
stressKeySuffixRange int
Size int
Stressers []Stresser
Members []*member
stressBuilder stressBuilder
}
type ClusterStatus struct {
AgentStatuses map[string]client.Status
}
func (c *cluster) bootstrap() error {
size := len(c.agents)
members := make([]*member, size)
memberNameURLs := make([]string, size)
for i, a := range c.agents {
agent, err := client.NewAgent(a.endpoint)
if err != nil {
return err
}
host, _, err := net.SplitHostPort(a.endpoint)
if err != nil {
return err
}
members[i] = &member{
Agent: agent,
Endpoint: a.endpoint,
Name: fmt.Sprintf("etcd-%d", i),
ClientURL: fmt.Sprintf("http://%s:%d", host, a.clientPort),
PeerURL: fmt.Sprintf("http://%s:%d", host, a.peerPort),
FailpointURL: fmt.Sprintf("http://%s:%d", host, a.failpointPort),
}
memberNameURLs[i] = members[i].ClusterEntry()
}
clusterStr := strings.Join(memberNameURLs, ",")
token := fmt.Sprint(rand.Int())
for i, m := range members {
flags := append(
m.Flags(),
"--data-dir", c.agents[i].datadir,
"--initial-cluster-token", token,
"--initial-cluster", clusterStr)
if _, err := m.Agent.Start(flags...); err != nil {
// cleanup
for _, m := range members[:i] {
m.Agent.Terminate()
}
return err
}
}
c.Stressers = make([]Stresser, len(members))
for i, m := range members {
c.Stressers[i] = c.stressBuilder(m)
go c.Stressers[i].Stress()
}
c.Size = size
c.Members = members
return nil
}
func (c *cluster) Reset() error { return c.bootstrap() }
func (c *cluster) WaitHealth() error {
var err error
// wait 60s to check cluster health.
// TODO: set it to a reasonable value. It is set that high because
// follower may use long time to catch up the leader when reboot under
// reasonable workload (https://github.com/coreos/etcd/issues/2698)
healthFunc := func(m *member) error { return m.SetHealthKeyV3() }
if c.v2Only {
healthFunc = func(m *member) error { return m.SetHealthKeyV2() }
}
for i := 0; i < 60; i++ {
for _, m := range c.Members {
if err = healthFunc(m); err != nil {
break
}
}
if err == nil {
return nil
}
plog.Warningf("#%d setHealthKey error (%v)", i, err)
time.Sleep(time.Second)
}
return err
}
// GetLeader returns the index of leader and error if any.
func (c *cluster) GetLeader() (int, error) {
if c.v2Only {
return 0, nil
}
for i, m := range c.Members {
isLeader, err := m.IsLeader()
if isLeader || err != nil {
return i, err
}
}
return 0, fmt.Errorf("no leader found")
}
func (c *cluster) Report() (success, failure int) {
for _, stress := range c.Stressers {
s, f := stress.Report()
success += s
failure += f
}
return
}
func (c *cluster) Cleanup() error {
var lasterr error
for _, m := range c.Members {
if err := m.Agent.Cleanup(); err != nil {
lasterr = err
}
}
for _, s := range c.Stressers {
s.Cancel()
}
return lasterr
}
func (c *cluster) Terminate() {
for _, m := range c.Members {
m.Agent.Terminate()
}
for _, s := range c.Stressers {
s.Cancel()
}
}
func (c *cluster) Status() ClusterStatus {
cs := ClusterStatus{
AgentStatuses: make(map[string]client.Status),
}
for _, m := range c.Members {
s, err := m.Agent.Status()
// TODO: add a.Desc() as a key of the map
desc := m.Endpoint
if err != nil {
cs.AgentStatuses[desc] = client.Status{State: "unknown"}
plog.Printf("failed to get the status of agent [%s]", desc)
}
cs.AgentStatuses[desc] = s
}
return cs
}
func (c *cluster) getRevisionHash() (map[string]int64, map[string]int64, error) {
revs := make(map[string]int64)
hashes := make(map[string]int64)
for _, m := range c.Members {
rev, hash, err := m.RevHash()
if err != nil {
return nil, nil, err
}
revs[m.ClientURL] = rev
hashes[m.ClientURL] = hash
}
return revs, hashes, nil
}
func (c *cluster) compactKV(rev int64, timeout time.Duration) (err error) {
if rev <= 0 {
return nil
}
for i, m := range c.Members {
u := m.ClientURL
conn, derr := m.dialGRPC()
if derr != nil {
plog.Printf("[compact kv #%d] dial error %v (endpoint %s)", i, derr, u)
err = derr
continue
}
kvc := pb.NewKVClient(conn)
ctx, cancel := context.WithTimeout(context.Background(), timeout)
plog.Printf("[compact kv #%d] starting (endpoint %s)", i, u)
_, cerr := kvc.Compact(ctx, &pb.CompactionRequest{Revision: rev, Physical: true}, grpc.FailFast(false))
cancel()
conn.Close()
succeed := true
if cerr != nil {
if strings.Contains(cerr.Error(), "required revision has been compacted") && i > 0 {
plog.Printf("[compact kv #%d] already compacted (endpoint %s)", i, u)
} else {
plog.Warningf("[compact kv #%d] error %v (endpoint %s)", i, cerr, u)
err = cerr
succeed = false
}
}
if succeed {
plog.Printf("[compact kv #%d] done (endpoint %s)", i, u)
}
}
return err
}
func (c *cluster) checkCompact(rev int64) error {
if rev == 0 {
return nil
}
for _, m := range c.Members {
if err := m.CheckCompact(rev); err != nil {
return err
}
}
return nil
}
func (c *cluster) defrag() error {
for _, m := range c.Members {
if err := m.Defrag(); err != nil {
return err
}
}
return nil
}