mirror of
https://github.com/TwiN/gatus.git
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115 lines
3.6 KiB
Go
115 lines
3.6 KiB
Go
package controller
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import (
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"bytes"
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"compress/gzip"
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"fmt"
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"log"
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"net/http"
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"strings"
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"time"
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"github.com/TwinProduction/gatus/config"
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"github.com/TwinProduction/gatus/security"
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"github.com/TwinProduction/gatus/watchdog"
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"github.com/TwinProduction/gocache"
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"github.com/gorilla/mux"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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)
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const (
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cacheTTL = 10 * time.Second
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)
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var (
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cache = gocache.NewCache().WithMaxSize(100).WithEvictionPolicy(gocache.LeastRecentlyUsed)
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)
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func init() {
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if err := cache.StartJanitor(); err != nil {
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log.Fatal("[controller][init] Failed to start cache janitor:", err.Error())
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}
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}
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// Handle creates the router and starts the server
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func Handle() {
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cfg := config.Get()
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router := CreateRouter(cfg)
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server := &http.Server{
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Addr: fmt.Sprintf("%s:%d", cfg.Web.Address, cfg.Web.Port),
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Handler: router,
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ReadTimeout: 15 * time.Second,
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WriteTimeout: 15 * time.Second,
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IdleTimeout: 15 * time.Second,
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}
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log.Printf("[controller][Handle] Listening on %s%s\n", cfg.Web.SocketAddress(), cfg.Web.ContextRoot)
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log.Fatal(server.ListenAndServe())
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}
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// CreateRouter creates the router for the http server
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func CreateRouter(cfg *config.Config) *mux.Router {
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router := mux.NewRouter()
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statusesHandler := serviceStatusesHandler
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if cfg.Security != nil && cfg.Security.IsValid() {
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statusesHandler = security.Handler(serviceStatusesHandler, cfg.Security)
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}
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router.HandleFunc("/favicon.ico", favIconHandler).Methods("GET") // favicon needs to be always served from the root
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router.HandleFunc(cfg.Web.PrependWithContextRoot("/api/v1/statuses"), statusesHandler).Methods("GET")
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router.HandleFunc(cfg.Web.PrependWithContextRoot("/api/v1/badges/uptime/{duration}/{identifier}"), badgeHandler).Methods("GET")
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router.HandleFunc(cfg.Web.PrependWithContextRoot("/health"), healthHandler).Methods("GET")
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router.PathPrefix(cfg.Web.ContextRoot).Handler(GzipHandler(http.StripPrefix(cfg.Web.ContextRoot, http.FileServer(http.Dir("./static")))))
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if cfg.Metrics {
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router.Handle(cfg.Web.PrependWithContextRoot("/metrics"), promhttp.Handler()).Methods("GET")
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}
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return router
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}
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func serviceStatusesHandler(writer http.ResponseWriter, r *http.Request) {
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gzipped := strings.Contains(r.Header.Get("Accept-Encoding"), "gzip")
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var exists bool
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var value interface{}
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if gzipped {
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writer.Header().Set("Content-Encoding", "gzip")
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value, exists = cache.Get("service-status-gzipped")
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} else {
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value, exists = cache.Get("service-status")
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}
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var data []byte
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if !exists {
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var err error
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buffer := &bytes.Buffer{}
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gzipWriter := gzip.NewWriter(buffer)
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data, err = watchdog.GetJSONEncodedServiceStatuses()
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if err != nil {
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log.Printf("[main][serviceStatusesHandler] Unable to marshal object to JSON: %s", err.Error())
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writer.WriteHeader(http.StatusInternalServerError)
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_, _ = writer.Write([]byte("Unable to marshal object to JSON"))
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return
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}
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_, _ = gzipWriter.Write(data)
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_ = gzipWriter.Close()
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gzippedData := buffer.Bytes()
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cache.SetWithTTL("service-status", data, cacheTTL)
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cache.SetWithTTL("service-status-gzipped", gzippedData, cacheTTL)
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if gzipped {
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data = gzippedData
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}
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} else {
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data = value.([]byte)
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}
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writer.Header().Add("Content-Type", "application/json")
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writer.WriteHeader(http.StatusOK)
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_, _ = writer.Write(data)
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}
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func healthHandler(writer http.ResponseWriter, _ *http.Request) {
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writer.Header().Add("Content-Type", "application/json")
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writer.WriteHeader(http.StatusOK)
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_, _ = writer.Write([]byte("{\"status\":\"UP\"}"))
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}
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// favIconHandler handles requests for /favicon.ico
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func favIconHandler(writer http.ResponseWriter, request *http.Request) {
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http.ServeFile(writer, request, "./static/favicon.ico")
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}
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