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etcd_test.go
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etcd_test.go
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package main
import (
"fmt"
"github.com/coreos/go-etcd/etcd"
"math/rand"
"os"
"strconv"
"testing"
"time"
)
// Create a single node and try to set value
func TestSingleNode(t *testing.T) {
procAttr := new(os.ProcAttr)
procAttr.Files = []*os.File{nil, os.Stdout, os.Stderr}
args := []string{"etcd", "-i", "-v", "-d=/tmp/node1"}
process, err := os.StartProcess("etcd", args, procAttr)
if err != nil {
t.Fatal("start process failed:" + err.Error())
return
}
defer process.Kill()
time.Sleep(time.Second)
etcd.SyncCluster()
// Test Set
result, err := etcd.Set("foo", "bar", 100)
if err != nil || result.Key != "/foo" || result.Value != "bar" || result.TTL != 99 {
if err != nil {
t.Fatal(err)
}
t.Fatalf("Set 1 failed with %s %s %v", result.Key, result.Value, result.TTL)
}
time.Sleep(time.Second)
result, err = etcd.Set("foo", "bar", 100)
if err != nil || result.Key != "/foo" || result.Value != "bar" || result.PrevValue != "bar" || result.TTL != 99 {
if err != nil {
t.Fatal(err)
}
t.Fatalf("Set 2 failed with %s %s %v", result.Key, result.Value, result.TTL)
}
}
// Create a three nodes and try to set value
func TestSimpleMultiNode(t *testing.T) {
procAttr := new(os.ProcAttr)
procAttr.Files = []*os.File{nil, os.Stdout, os.Stderr}
clusterSize := 3
_, etcds, err := createCluster(clusterSize, procAttr)
if err != nil {
t.Fatal("cannot create cluster")
}
defer destroyCluster(etcds)
time.Sleep(time.Second)
etcd.SyncCluster()
// Test Set
result, err := etcd.Set("foo", "bar", 100)
if err != nil || result.Key != "/foo" || result.Value != "bar" || result.TTL != 99 {
if err != nil {
t.Fatal(err)
}
t.Fatalf("Set 1 failed with %s %s %v", result.Key, result.Value, result.TTL)
}
time.Sleep(time.Second)
result, err = etcd.Set("foo", "bar", 100)
if err != nil || result.Key != "/foo" || result.Value != "bar" || result.PrevValue != "bar" || result.TTL != 99 {
if err != nil {
t.Fatal(err)
}
t.Fatalf("Set 2 failed with %s %s %v", result.Key, result.Value, result.TTL)
}
}
// Create a five nodes
// Randomly kill one of the node and keep on sending set command to the cluster
func TestMultiNodeRecovery(t *testing.T) {
procAttr := new(os.ProcAttr)
procAttr.Files = []*os.File{nil, os.Stdout, os.Stderr}
clusterSize := 5
argGroup, etcds, err := createCluster(clusterSize, procAttr)
if err != nil {
t.Fatal("cannot create cluster")
}
defer destroyCluster(etcds)
time.Sleep(2 * time.Second)
etcd.SyncCluster()
stop := make(chan bool)
// Test Set
go set(t, stop)
for i := 0; i < 10; i++ {
num := rand.Int() % clusterSize
fmt.Println("kill node", num+1)
// kill
etcds[num].Kill()
etcds[num].Release()
time.Sleep(time.Second)
// restart
etcds[num], err = os.StartProcess("etcd", argGroup[num], procAttr)
if err != nil {
panic(err)
}
time.Sleep(time.Second)
}
stop <- true
<-stop
}
// Sending set commands
func set(t *testing.T, stop chan bool) {
stopSet := false
i := 0
for {
key := fmt.Sprintf("%s_%v", "foo", i)
result, err := etcd.Set(key, "bar", 0)
if err != nil || result.Key != "/"+key || result.Value != "bar" {
if err != nil {
t.Fatal(err)
}
t.Fatalf("Set failed with %s %s %v", result.Key, result.Value)
}
select {
case <-stop:
stopSet = true
default:
}
if stopSet {
break
}
i++
}
stop <- true
}
// Create a cluster of etcd nodes
func createCluster(size int, procAttr *os.ProcAttr) ([][]string, []*os.Process, error) {
argGroup := make([][]string, size)
for i := 0; i < size; i++ {
if i == 0 {
argGroup[i] = []string{"etcd", "-d=/tmp/node1"}
} else {
strI := strconv.Itoa(i + 1)
argGroup[i] = []string{"etcd", "-c=400" + strI, "-s=700" + strI, "-d=/tmp/node" + strI, "-C=127.0.0.1:7001"}
}
}
etcds := make([]*os.Process, size)
for i, _ := range etcds {
var err error
etcds[i], err = os.StartProcess("etcd", append(argGroup[i], "-i"), procAttr)
if err != nil {
return nil, nil, err
}
}
return argGroup, etcds, nil
}
// Destroy all the nodes in the cluster
func destroyCluster(etcds []*os.Process) error {
for _, etcd := range etcds {
etcd.Kill()
etcd.Release()
}
return nil
}