feta/apiserver.go

package feta

import "fmt"
import "os"
import "time"
import "net/http"

import "github.com/rs/zerolog/log"
import "github.com/gin-gonic/gin"
import "github.com/dn365/gin-zerolog"

type FetaAPIServer struct {
	feta *FetaProcess
}

func (self *FetaAPIServer) SetFeta(feta *FetaProcess) {
	self.feta = feta
}

func (a *FetaAPIServer) Serve() {
	if a.feta == nil {
		panic("must have feta app from which to serve stats")
	}
	s := a.getServer()
	err := s.ListenAndServe()
	if err != nil {
		log.Fatal().Msg("webserver failure: " + err.Error())
		return
	}
}

func (a *FetaAPIServer) getRouter() *gin.Engine {
	if os.Getenv("DEBUG") == "" {
		gin.SetMode(gin.ReleaseMode)
	}

	// empty router
	r := gin.New()

	// wrap panics:
	r.Use(gin.Recovery())

	// attach logger middleware
	r.Use(ginzerolog.Logger("gin"))

	r.GET("/.well-known/healthcheck.json", gin.WrapF(a.getHealthCheckHandler()))
	r.GET("/", func(c *gin.Context) { c.Redirect(http.StatusMovedPermanently, "/feta") })
	r.GET("/feta", gin.WrapF(a.getIndexHandler()))
	r.GET("/feta/list/instances", gin.WrapF(a.getInstanceListHandler()))

	return r
}

func (a *FetaAPIServer) getServer() *http.Server {
	r := a.getRouter()

	port := "8080"
	if os.Getenv("PORT") != "" {
		port = os.Getenv("PORT")
	}

	log.Info().Str("port", port).Msg("starting webserver")

	s := &http.Server{
		Addr:           fmt.Sprintf(":%s", port),
		Handler:        r,
		ReadTimeout:    10 * time.Second,
		WriteTimeout:   10 * time.Second,
		MaxHeaderBytes: 1 << 20,
	}
	return s
}