Added metrics, stats and logging

This commit is contained in:
James Mills 2017-07-06 01:33:31 -07:00
parent 84159c33bf
commit 89269b7aad
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GPG Key ID: AC4C014F1440EBD6

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@ -1,12 +1,21 @@
package main
import (
"encoding/json"
"fmt"
"io/ioutil"
"log"
"net/http"
"net/url"
// Logging
"github.com/unrolled/logger"
// Stats/Metrics
"github.com/rcrowley/go-metrics"
"github.com/rcrowley/go-metrics/exp"
"github.com/thoas/stats"
"github.com/GeertJohan/go.rice"
"github.com/julienschmidt/httprouter"
"github.com/patrickmn/go-cache"
@ -15,11 +24,40 @@ import (
"go.iondynamics.net/templice"
)
// AcceptedTypes ...
var AcceptedTypes = []string{
"text/html",
"text/plain",
}
// Counters ...
type Counters struct {
r metrics.Registry
}
func NewCounters() *Counters {
counters := &Counters{
r: metrics.NewRegistry(),
}
return counters
}
func (c *Counters) Inc(name string) {
metrics.GetOrRegisterCounter(name, c.r).Inc(1)
}
func (c *Counters) Dec(name string) {
metrics.GetOrRegisterCounter(name, c.r).Dec(1)
}
func (c *Counters) IncBy(name string, n int64) {
metrics.GetOrRegisterCounter(name, c.r).Inc(n)
}
func (c *Counters) DecBy(name string, n int64) {
metrics.GetOrRegisterCounter(name, c.r).Dec(n)
}
// Server ...
type Server struct {
bind string
@ -27,6 +65,13 @@ type Server struct {
store *cache.Cache
templates *templice.Template
router *httprouter.Router
// Logger
logger *logger.Logger
// Stats/Metrics
counters *Counters
stats *stats.Stats
}
func (s *Server) render(w http.ResponseWriter, tmpl string, data interface{}) {
@ -39,6 +84,8 @@ func (s *Server) render(w http.ResponseWriter, tmpl string, data interface{}) {
// IndexHandler ...
func (s *Server) IndexHandler() httprouter.Handle {
return func(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
s.counters.Inc("n_index")
accepts, err := accept.Negotiate(
r.Header.Get("Accept"), AcceptedTypes...,
)
@ -60,6 +107,8 @@ func (s *Server) IndexHandler() httprouter.Handle {
// PasteHandler ...
func (s *Server) PasteHandler() httprouter.Handle {
return func(w http.ResponseWriter, r *http.Request, p httprouter.Params) {
s.counters.Inc("n_paste")
var blob string
body, err := ioutil.ReadAll(r.Body)
@ -91,7 +140,7 @@ func (s *Server) PasteHandler() httprouter.Handle {
uuid := shortuuid.NewWithNamespace(s.config.fqdn)
s.store.Set(uuid, blob, cache.DefaultExpiration)
u, err := url.Parse(fmt.Sprintf("./%s", uuid))
u, err := url.Parse(fmt.Sprintf("./view/%s", uuid))
if err != nil {
http.Error(w, "Internal Error", http.StatusInternalServerError)
}
@ -102,6 +151,8 @@ func (s *Server) PasteHandler() httprouter.Handle {
// ViewHandler ...
func (s *Server) ViewHandler() httprouter.Handle {
return func(w http.ResponseWriter, r *http.Request, p httprouter.Params) {
s.counters.Inc("n_view")
accepts, err := accept.Negotiate(
r.Header.Get("Accept"), AcceptedTypes...,
)
@ -134,15 +185,37 @@ func (s *Server) ViewHandler() httprouter.Handle {
}
}
// StatsHandler ...
func (s *Server) StatsHandler() httprouter.Handle {
return func(w http.ResponseWriter, r *http.Request, p httprouter.Params) {
w.Header().Set("Content-Type", "application/json; charset=utf-8")
bs, err := json.Marshal(s.stats.Data())
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
}
w.Write(bs)
}
}
// ListenAndServe ...
func (s *Server) ListenAndServe() {
log.Fatal(http.ListenAndServe(s.bind, s.router))
log.Fatal(
http.ListenAndServe(
s.bind,
s.logger.Handler(
s.stats.Handler(s.router),
),
),
)
}
func (s *Server) initRoutes() {
s.router.Handler("GET", "/debug/metrics", exp.ExpHandler(s.counters.r))
s.router.GET("/debug/stats", s.StatsHandler())
s.router.GET("/", s.IndexHandler())
s.router.POST("/", s.PasteHandler())
s.router.GET("/:uuid", s.ViewHandler())
s.router.GET("/view/:uuid", s.ViewHandler())
}
// NewServer ...
@ -153,6 +226,17 @@ func NewServer(bind string, config Config) *Server {
router: httprouter.New(),
store: cache.New(cfg.expiry, cfg.expiry*2),
templates: templice.New(rice.MustFindBox("templates")),
// Logger
logger: logger.New(logger.Options{
Prefix: "pastebin",
RemoteAddressHeaders: []string{"X-Forwarded-For"},
OutputFlags: log.LstdFlags,
}),
// Stats/Metrics
counters: NewCounters(),
stats: stats.New(),
}
err := server.templates.Load()