mirror of
https://github.com/TwiN/gatus.git
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98 lines
3 KiB
Go
98 lines
3 KiB
Go
package main
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import (
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"bytes"
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"compress/gzip"
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"log"
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"net/http"
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"os"
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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/prometheus/client_golang/prometheus/promhttp"
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)
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const cacheTTL = 10 * time.Second
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var (
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cachedServiceResults []byte
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cachedServiceResultsGzipped []byte
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cachedServiceResultsTimestamp time.Time
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)
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func main() {
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cfg := loadConfiguration()
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resultsHandler := serviceResultsHandler
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if cfg.Security != nil && cfg.Security.IsValid() {
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resultsHandler = security.Handler(serviceResultsHandler, cfg.Security)
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}
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// favicon needs to be always served from the root
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http.HandleFunc("/favicon.ico", favIconHandler)
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http.HandleFunc(cfg.Web.AppendToCtxRoot("/api/v1/results"), resultsHandler)
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http.HandleFunc(cfg.Web.AppendToCtxRoot("/health"), healthHandler)
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http.Handle(cfg.Web.CtxRoot(), GzipHandler(http.StripPrefix(cfg.Web.CtxRoot(), http.FileServer(http.Dir("./static")))))
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if cfg.Metrics {
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http.Handle(cfg.Web.AppendToCtxRoot("/metrics"), promhttp.Handler())
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}
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log.Printf("[main][main] Listening on %s%s\n", cfg.Web.SocketAddress(), cfg.Web.CtxRoot())
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go watchdog.Monitor(cfg)
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log.Fatal(http.ListenAndServe(cfg.Web.SocketAddress(), nil))
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}
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func loadConfiguration() *config.Config {
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var err error
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customConfigFile := os.Getenv("GATUS_CONFIG_FILE")
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if len(customConfigFile) > 0 {
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err = config.Load(customConfigFile)
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} else {
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err = config.LoadDefaultConfiguration()
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}
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if err != nil {
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panic(err)
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}
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return config.Get()
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}
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func serviceResultsHandler(writer http.ResponseWriter, r *http.Request) {
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if isExpired := cachedServiceResultsTimestamp.IsZero() || time.Now().Sub(cachedServiceResultsTimestamp) > cacheTTL; isExpired {
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buffer := &bytes.Buffer{}
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gzipWriter := gzip.NewWriter(buffer)
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data, err := watchdog.GetJSONEncodedServiceResults()
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if err != nil {
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log.Printf("[main][serviceResultsHandler] 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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cachedServiceResults = data
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cachedServiceResultsGzipped = buffer.Bytes()
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cachedServiceResultsTimestamp = time.Now()
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}
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var data []byte
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if strings.Contains(r.Header.Get("Accept-Encoding"), "gzip") {
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writer.Header().Set("Content-Encoding", "gzip")
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data = cachedServiceResultsGzipped
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} else {
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data = cachedServiceResults
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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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// favIconHanlder responds to /favicon.ico requests
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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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