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cluster.go
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cluster.go
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package main
import (
"bytes"
"encoding/json"
"fmt"
"io"
"log"
"net/http"
"net/url"
"os/exec"
"strings"
"time"
)
const (
MAX_TRIES = 120
)
type Options struct {
user, pass, errorMessage string
status int
}
func httpDo(method, uri string, data *bytes.Buffer, opt Options) []byte {
// cleanup before panic
defer func() {
if p := recover(); p != nil {
cleanupContainers()
panic(p)
}
}()
client := &http.Client{}
req, err := http.NewRequest(method, uri, data)
if err != nil {
cleanupContainers()
log.Fatalf("%s\nNewRequest failed for %+v: %v", opt.errorMessage, req, err)
}
req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
if opt.user != "" && opt.pass != "" {
req.SetBasicAuth(opt.user, opt.pass)
}
req.Close = true
resp, err := client.Do(req)
if err != nil {
cleanupContainers()
log.Fatalf("%s\nsend request failed %+v: %v", opt.errorMessage, req, err)
}
defer resp.Body.Close()
respBody, err := io.ReadAll(resp.Body)
if err != nil {
cleanupContainers()
log.Fatalf("%s\ncould not read resp body for request %+v: %v", opt.errorMessage, req, err)
}
if resp.StatusCode != opt.status {
rb, err := req.GetBody()
if err != nil {
cleanupContainers()
log.Fatalf("%s\ncould not get req body for request %+v: %v", opt.errorMessage, req, err)
}
reqBody, err := io.ReadAll(rb)
if err != nil {
cleanupContainers()
log.Fatalf("%s\ncould not read req body for request %+v: %v", opt.errorMessage, req, err)
}
cleanupContainers()
log.Fatalf("%s\n%+v\nreqBody: %s\n%+v\nrespBody: %s", opt.errorMessage, req, string(reqBody), resp, string(respBody))
}
return respBody
}
func makeNode(port int, containerName string, version string) {
cmd := exec.Command(
"docker", "run", "--rm", "-d",
"-p", fmt.Sprintf("%d:8091", port),
"-p", "8092-8096",
"-p", "11207",
"-p", "11210",
"-p", "18091-18096",
"--name", containerName,
"--privileged",
"--network=cb-net",
fmt.Sprintf("couchbase/server:%s", version),
)
if err := cmd.Run(); err != nil {
log.Fatalf("could not create node: %v", err)
}
runningContainers = append(runningContainers, containerName)
}
func waitTillNodeIsUp(port int) {
url := fmt.Sprintf("http://localhost:%d", port)
for tries := 1; tries <= MAX_TRIES; tries++ {
resp, err := http.Get(url)
if resp != nil && err != nil {
log.Printf("HTTP GET for waitTillNodeIsUp failed: %v", err)
time.Sleep(1 * time.Second)
continue
}
if resp != nil && resp.StatusCode == http.StatusOK {
return
}
time.Sleep(1 * time.Second)
}
cleanupContainers()
log.Fatal("node is not up in 2 min")
}
func initFirstNode(port int, services, username, password, storageMode string) {
httpDo(http.MethodPost,
fmt.Sprintf("http://localhost:%d/settings/indexes", port),
bytes.NewBufferString(url.Values{"storageMode": {storageMode}}.Encode()),
Options{
errorMessage: "Index configuration failed",
status: http.StatusOK,
},
)
httpDo(http.MethodPost,
fmt.Sprintf("http://localhost:%d/node/controller/setupServices", port),
bytes.NewBufferString(url.Values{"services": {services}}.Encode()),
Options{
errorMessage: "Setting up services failed",
status: http.StatusOK,
},
)
httpDo(http.MethodPost,
fmt.Sprintf("http://localhost:%d/settings/web", port),
bytes.NewBufferString(url.Values{"username": {username}, "password": {password}, "port": {"8091"}}.Encode()),
Options{
errorMessage: "Setting up username and password failed",
status: http.StatusOK,
},
)
// Set memory quotas
// n1ql and backup don't have quotas
form := url.Values{}
form.Add("memoryQuota", "256")
form.Add("indexMemoryQuota", "256")
form.Add("cbasMemoryQuota", "1024")
form.Add("eventingMemoryQuota", "256")
form.Add("ftsMemoryQuota", "256")
httpDo(http.MethodPost,
fmt.Sprintf("http://localhost:%d/pools/default", port),
bytes.NewBufferString(form.Encode()),
Options{
user: username,
pass: password,
errorMessage: "Setting up memory quotas failed",
status: http.StatusOK,
},
)
}
func addNode(port, nodePort int, hostname, version, services, username, password string) string {
makeNode(nodePort, hostname, version)
waitTillNodeIsUp(nodePort)
IP := getIP(hostname)
form := url.Values{}
form.Add("hostname", IP)
form.Add("user", username)
form.Add("password", password)
form.Add("services", services)
httpDo(http.MethodPost,
fmt.Sprintf("http://localhost:%d/controller/addNode", port),
bytes.NewBufferString(form.Encode()),
Options{
user: username,
pass: password,
errorMessage: "Add node failed",
status: http.StatusOK,
},
)
return fmt.Sprintf("ns_1@%s,", IP)
}
func rebalance(port int, knownNodes, username, password string) {
nodes := url.QueryEscape(strings.TrimSuffix(knownNodes, ","))
form := url.Values{}
form.Add("knownNodes", nodes)
httpDo(http.MethodPost,
fmt.Sprintf("http://localhost:%d/controller/rebalance", port),
bytes.NewBufferString(strings.ReplaceAll(form.Encode(), "%25", "%")),
Options{
user: username,
pass: password,
errorMessage: "Rebalance failed",
status: http.StatusOK,
},
)
for tries := 1; tries <= MAX_TRIES; tries++ {
body := httpDo(http.MethodGet,
fmt.Sprintf("http://localhost:%d/pools/default/rebalanceProgress", port),
bytes.NewBufferString(""),
Options{
user: username,
pass: password,
errorMessage: "Could not get rebalance progress",
status: http.StatusOK,
},
)
progress := struct {
Status string `json:"status"`
}{}
if err := json.NewDecoder(strings.NewReader(string(body))).Decode(&progress); err != nil {
cleanupContainers()
log.Fatalf("Could not decode rebalance progress: %v", err)
}
if progress.Status == "none" {
return
}
time.Sleep(1 * time.Second)
}
cleanupContainers()
log.Fatal("Could not rebalance in 2 min")
}