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main.go
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main.go
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package main
import (
"context"
"errors"
"fmt"
"io"
"io/fs"
"net/http"
"os"
"os/signal"
"runtime"
"traefik-lazyload/pkg/config"
"traefik-lazyload/pkg/containers"
"traefik-lazyload/pkg/service"
"github.com/docker/docker/client"
"github.com/sirupsen/logrus"
)
type controller struct {
assets assetTemplates
core *service.Core
discovery *containers.Discovery
}
func mustCreateDockerClient() *client.Client {
cli, err := client.NewClientWithOpts(client.FromEnv, client.WithAPIVersionNegotiation())
if err != nil {
logrus.Fatal("Unable to connect to docker: ", err)
}
return cli
}
func main() {
config.Load()
if config.Model.Verbose {
logrus.SetLevel(logrus.DebugLevel)
logrus.Debug("Verbose is on")
}
dockerClient := mustCreateDockerClient()
discovery := containers.NewDiscovery(dockerClient)
var err error
core, err := service.New(dockerClient, discovery, config.Model.PollFreq)
if err != nil {
logrus.Fatal(err)
}
defer core.Close()
if config.Model.StopAtBoot {
core.StopAll()
}
controller := controller{
*LoadTemplates(),
core,
discovery,
}
// Set up http server
subFs, _ := fs.Sub(httpAssets, "assets")
router := http.NewServeMux()
router.Handle(httpAssetPrefix, http.StripPrefix(httpAssetPrefix, http.FileServer(http.FS(subFs))))
router.HandleFunc("/", controller.ContainerHandler)
srv := &http.Server{
Addr: config.Model.Listen,
Handler: router,
}
sigChan := make(chan os.Signal, 1)
signal.Notify(sigChan, os.Interrupt)
go func() {
<-sigChan
logrus.Info("Shutting down...")
srv.Shutdown(context.Background())
}()
logrus.Infof("Listening on %s...", config.Model.Listen)
if config.Model.StatusHost != "" {
logrus.Infof("Status host set to %s", config.Model.StatusHost)
}
if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
logrus.Fatal(err)
}
}
func (s *controller) ContainerHandler(w http.ResponseWriter, r *http.Request) {
host := r.Host
if host == "" {
w.WriteHeader(http.StatusNotFound)
io.WriteString(w, "Not Found")
return
}
if host == config.Model.StatusHost && config.Model.StatusHost != "" {
s.StatusHandler(w, r)
return
}
if sOpts, err := s.core.StartHost(host); err != nil {
if errors.Is(err, containers.ErrNotFound) {
w.WriteHeader(http.StatusNotFound)
io.WriteString(w, "not found")
} else {
w.WriteHeader(http.StatusInternalServerError)
io.WriteString(w, err.Error())
}
} else {
w.WriteHeader(http.StatusAccepted)
renderErr := s.assets.splash.Execute(w, SplashModel{
Hostname: host,
ContainerState: sOpts,
})
if renderErr != nil {
logrus.Error(renderErr)
}
}
}
func (s *controller) StatusHandler(w http.ResponseWriter, r *http.Request) {
switch r.URL.Path {
case "/":
var stats runtime.MemStats
runtime.ReadMemStats(&stats)
qualifying, _ := s.discovery.QualifyingContainers(r.Context())
providers, _ := s.discovery.ProviderContainers(r.Context())
s.assets.status.Execute(w, StatusPageModel{
Active: s.core.ActiveContainers(),
Qualifying: qualifying,
Providers: providers,
RuntimeMetrics: fmt.Sprintf("Heap=%d, InUse=%d, Total=%d, Sys=%d, NumGC=%d", stats.HeapAlloc, stats.HeapInuse, stats.TotalAlloc, stats.Sys, stats.NumGC),
})
default:
w.WriteHeader(http.StatusNotFound)
io.WriteString(w, "Status page not found")
}
}