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nginx.go
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nginx.go
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package controller
import (
"errors"
"fmt"
"io/ioutil"
"net"
"os"
"os/exec"
"strconv"
"syscall"
"time"
"github.com/caicloud/canary-release/proxies/nginx/config"
"github.com/caicloud/canary-release/proxies/nginx/template"
"github.com/mitchellh/go-ps"
log "github.com/zoumo/logdog"
"k8s.io/apimachinery/pkg/util/wait"
)
var (
tmplPath = "/etc/nginx/template/nginx.tmpl"
cfgPath = "/etc/nginx/nginx.conf"
binary = "/usr/sbin/nginx"
)
// NginxController ...
type NginxController struct {
binary string
cmdArgs []string
template *template.Template
}
// NewNginxController returns a new NginxController
func NewNginxController() *NginxController {
n := &NginxController{
binary: binary,
}
var onChange func()
onChange = func() {
tmpl, err := template.NewTemplate(tmplPath, onChange)
if err != nil {
log.Errorf(`
-------------------------------------------------------------------------------
Error loading new template : %v
-------------------------------------------------------------------------------
`, err)
return
}
n.template.Close()
n.template = tmpl
log.Info("New Nginx template loaded")
}
tmpl, err := template.NewTemplate(tmplPath, onChange)
if err != nil {
log.Error("Invalid Nginx template", log.Fields{"err": err})
}
n.template = tmpl
return n
}
// Start ...
func (n *NginxController) Start() {
done := make(chan error, 1)
cmd := exec.Command(n.binary, "-c", cfgPath)
// put nginx in another process group to prevent it
// to receive signals meant for the controller
cmd.SysProcAttr = &syscall.SysProcAttr{
Setpgid: true,
Pgid: 0,
}
log.Info("Starting nginx process...")
n.start(cmd, done)
for {
err := <-done
if exitError, ok := err.(*exec.ExitError); ok {
waitStatus := exitError.Sys().(syscall.WaitStatus)
log.Warnf(`
-------------------------------------------------------------------------------
NGINX master process died (%v): %v
-------------------------------------------------------------------------------
`, waitStatus.ExitStatus(), err)
}
cmd.Process.Release()
cmd = exec.Command(n.binary, "-c", cfgPath)
wait.PollInfinite(1*time.Second, func() (bool, error) {
conn, err := net.DialTimeout("tcp", "127.0.0.1:80", 1*time.Second)
if err != nil {
return true, nil
}
conn.Close()
return false, nil
})
n.start(cmd, done)
}
}
func (n *NginxController) start(cmd *exec.Cmd, done chan error) {
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
if err := cmd.Start(); err != nil {
log.Errorf("nginx error: %v", err)
done <- err
return
}
n.cmdArgs = cmd.Args
go func() {
done <- cmd.Wait()
}()
}
// Stop ...
func (n *NginxController) Stop() error {
cmd := exec.Command(n.binary, "-c", cfgPath, "-s", "quit")
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
err := cmd.Run()
if err != nil {
return err
}
waitForNginxShutdown()
log.Info("Nginx process has stopped")
return nil
}
// testTemplate checks if the NGINX configuration inside the byte array is valid
// running the command "nginx -t" using a temporal file.
func (n *NginxController) testTemplate(cfg []byte) error {
if len(cfg) == 0 {
return fmt.Errorf("invalid nginx configuration (empty)")
}
tmpfile, err := ioutil.TempFile("", "nginx-cfg")
if err != nil {
return err
}
defer tmpfile.Close()
err = ioutil.WriteFile(tmpfile.Name(), cfg, 0644)
if err != nil {
return err
}
out, err := exec.Command(n.binary, "-t", "-c", tmpfile.Name()).CombinedOutput()
if err != nil {
// this error is different from the rest because it must be clear why nginx is not working
oe := fmt.Sprintf(`
-------------------------------------------------------------------------------
Error: %v
%v
-------------------------------------------------------------------------------
`, err, string(out))
return errors.New(oe)
}
os.Remove(tmpfile.Name())
return nil
}
// OnUpdate is called by proxy.sync periodically to keep the configuration in sync
func (n *NginxController) OnUpdate(cfg config.TemplateConfig) error {
backlogSize := sysctlSomaxconn()
wp, err := strconv.Atoi(cfg.Cfg.WorkerProcesses)
if err != nil {
wp = 1
}
maxOpenFiles := (sysctlFSFileMax() / wp) - 1024
if maxOpenFiles < 1024 {
maxOpenFiles = 1024
}
cfg.BacklogSize = backlogSize
cfg.MaxOpenFiles = maxOpenFiles
cfg.IsIPV6Enabled = true
cfg.Cfg.EnableVtsStatus = true
content, err := n.template.Write(cfg)
if err != nil {
return err
}
err = n.testTemplate(content)
if err != nil {
return err
}
err = ioutil.WriteFile(cfgPath, content, 0644)
if err != nil {
return err
}
o, err := exec.Command(n.binary, "-s", "reload", "-c", cfgPath).CombinedOutput()
if err != nil {
return fmt.Errorf("%v\n%v", err, string(o))
}
return nil
}
// isNginxRunning returns true if a process with the name 'nginx' is found
func isNginxProcessPresent() bool {
processes, _ := ps.Processes()
for _, p := range processes {
if p.Executable() == "nginx" {
return true
}
}
return false
}
func waitForNginxShutdown() {
wait.PollImmediateInfinite(1*time.Second, func() (bool, error) {
if !isNginxProcessPresent() {
return true, nil
}
return false, nil
})
}