mattermost/api/server.go

// Copyright (c) 2015 Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.

package api

import (
	l4g "github.com/alecthomas/log4go"
	"github.com/braintree/manners"
	"github.com/gorilla/handlers"
	"github.com/gorilla/mux"
	"github.com/mattermost/platform/store"
	"github.com/mattermost/platform/utils"
	"gopkg.in/throttled/throttled.v2"
	"gopkg.in/throttled/throttled.v2/store/memstore"
	"net/http"
	"strings"
	"time"
)

type Server struct {
	Store  store.Store
	Router *mux.Router
}

type CorsWrapper struct {
	router *mux.Router
}

var Srv *Server

func NewServer() {

	l4g.Info(utils.T("api.server.new_server.init.info"))

	Srv = &Server{}
	Srv.Store = store.NewSqlStore()

	Srv.Router = mux.NewRouter()
	Srv.Router.NotFoundHandler = http.HandlerFunc(Handle404)
}

type VaryBy struct{}

func (m *VaryBy) Key(r *http.Request) string {
	return GetIpAddress(r)
}

func initalizeThrottledVaryBy() *throttled.VaryBy {
	vary := throttled.VaryBy{}

	if utils.Cfg.RateLimitSettings.VaryByRemoteAddr {
		vary.RemoteAddr = true
	}

	if len(utils.Cfg.RateLimitSettings.VaryByHeader) > 0 {
		vary.Headers = strings.Fields(utils.Cfg.RateLimitSettings.VaryByHeader)

		if utils.Cfg.RateLimitSettings.VaryByRemoteAddr {
			l4g.Warn(utils.T("api.server.start_server.rate.warn"))
			vary.RemoteAddr = false
		}
	}

	return &vary
}

func StartServer() {
	l4g.Info(utils.T("api.server.start_server.starting.info"))
	l4g.Info(utils.T("api.server.start_server.listening.info"), utils.Cfg.ServiceSettings.ListenAddress)

	var handler http.Handler = &CorsWrapper{Srv.Router}

	if utils.Cfg.RateLimitSettings.EnableRateLimiter {
		l4g.Info(utils.T("api.server.start_server.rate.info"))

		store, err := memstore.New(utils.Cfg.RateLimitSettings.MemoryStoreSize)
		if err != nil {
			l4g.Critical(utils.T("api.server.start_server.rate_limiting_memory_store"))
			return
		}

		quota := throttled.RateQuota{
			MaxRate:  throttled.PerSec(utils.Cfg.RateLimitSettings.PerSec),
			MaxBurst: 100,
		}

		rateLimiter, err := throttled.NewGCRARateLimiter(store, quota)
		if err != nil {
			l4g.Critical(utils.T("api.server.start_server.rate_limiting_rate_limiter"))
			return
		}

		httpRateLimiter := throttled.HTTPRateLimiter{
			RateLimiter: rateLimiter,
			VaryBy:      &VaryBy{},
			DeniedHandler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
				l4g.Error("%v: Denied due to throttling settings code=429 ip=%v", r.URL.Path, GetIpAddress(r))
				throttled.DefaultDeniedHandler.ServeHTTP(w, r)
			}),
		}

		handler = httpRateLimiter.RateLimit(handler)
	}

	go func() {
		err := manners.ListenAndServe(utils.Cfg.ServiceSettings.ListenAddress, handlers.RecoveryHandler(handlers.PrintRecoveryStack(true))(handler))
		if err != nil {
			l4g.Critical(utils.T("api.server.start_server.starting.critical"), err)
			time.Sleep(time.Second)
		}
	}()
}

func StopServer() {

	l4g.Info(utils.T("api.server.stop_server.stopping.info"))

	manners.Close()
	Srv.Store.Close()
	hub.Stop()

	l4g.Info(utils.T("api.server.stop_server.stopped.info"))
}