26ddc36a4e
will only scape metrics on pihole when asked on /metrics allow port 0 to be used when using strict https redirects Resolves: #49
70 lines
1.6 KiB
Go
70 lines
1.6 KiB
Go
package server
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import (
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"log"
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"net/http"
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"time"
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"github.com/eko/pihole-exporter/internal/pihole"
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"golang.org/x/net/context"
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)
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// Server is the struct for the HTTP server.
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type Server struct {
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httpServer *http.Server
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}
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// NewServer method initializes a new HTTP server instance and associates
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// the different routes that will be used by Prometheus (metrics) or for monitoring (readiness, liveness).
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func NewServer(port string, client *pihole.Client) *Server {
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mux := http.NewServeMux()
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httpServer := &http.Server{Addr: ":" + port, Handler: mux}
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s := &Server{
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httpServer: httpServer,
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}
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mux.Handle("/metrics", client.Metrics())
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mux.Handle("/readiness", s.readinessHandler())
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mux.Handle("/liveness", s.livenessHandler())
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return s
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}
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// ListenAndServe method serves HTTP requests.
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func (s *Server) ListenAndServe() {
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log.Println("Starting HTTP server")
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err := s.httpServer.ListenAndServe()
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if err != nil {
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log.Printf("Failed to start serving HTTP requests: %v", err)
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}
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}
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// Stop method stops the HTTP server (so the exporter become unavailable).
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func (s *Server) Stop() {
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ctx, cancel := context.WithTimeout(context.Background(), time.Second)
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defer cancel()
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s.httpServer.Shutdown(ctx)
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}
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func (s *Server) readinessHandler() http.HandlerFunc {
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return func(w http.ResponseWriter, req *http.Request) {
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if s.isReady() {
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w.WriteHeader(http.StatusOK)
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} else {
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w.WriteHeader(http.StatusNotFound)
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}
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}
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}
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func (s *Server) livenessHandler() http.HandlerFunc {
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return func(w http.ResponseWriter, req *http.Request) {
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w.WriteHeader(http.StatusOK)
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}
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}
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func (s *Server) isReady() bool {
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return s.httpServer != nil
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}
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