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middleware.go
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middleware.go
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// khan
// https://github.com/topfreegames/khan
//
// Licensed under the MIT license:
// http://www.opensource.org/licenses/mit-license
// Copyright © 2016 Top Free Games <backend@tfgco.com>
package api
import (
"bytes"
"encoding/json"
"fmt"
"io"
"runtime/debug"
"time"
"github.com/getsentry/raven-go"
"github.com/labstack/echo"
"github.com/topfreegames/khan/log"
"github.com/uber-go/zap"
)
func getBodyFromNext(c echo.Context, next echo.HandlerFunc) (string, error) {
res := c.Response()
rw := res.Writer()
buf := new(bytes.Buffer)
mw := io.MultiWriter(rw, buf)
res.SetWriter(mw)
err := next(c)
body := buf.String()
return body, err
}
//NewBodyExtractionMiddleware with API version
func NewBodyExtractionMiddleware() *BodyExtractionMiddleware {
return &BodyExtractionMiddleware{}
}
type BodyExtractionMiddleware struct{}
// Serve serves the middleware
func (v *BodyExtractionMiddleware) Serve(next echo.HandlerFunc) echo.HandlerFunc {
return func(c echo.Context) error {
body, err := getBodyFromNext(c, next)
c.Set("body", body)
return err
}
}
//NewVersionMiddleware with API version
func NewVersionMiddleware() *VersionMiddleware {
return &VersionMiddleware{
Version: VERSION,
}
}
//VersionMiddleware inserts the current version in all requests
type VersionMiddleware struct {
Version string
}
// Serve serves the middleware
func (v *VersionMiddleware) Serve(next echo.HandlerFunc) echo.HandlerFunc {
return func(c echo.Context) error {
return WithSegment("middleware-version", c, func() error {
c.Response().Header().Set(echo.HeaderServer, fmt.Sprintf("Khan/v%s", v.Version))
c.Response().Header().Set("Khan-Server", fmt.Sprintf("Khan/v%s", v.Version))
return next(c)
})
}
}
//NewSentryMiddleware returns a new sentry middleware
func NewSentryMiddleware(app *App) *SentryMiddleware {
return &SentryMiddleware{
App: app,
}
}
//SentryMiddleware is responsible for sending all exceptions to sentry
type SentryMiddleware struct {
App *App
}
// Serve serves the middleware
func (s *SentryMiddleware) Serve(next echo.HandlerFunc) echo.HandlerFunc {
return func(c echo.Context) error {
return WithSegment("middleware-sentry", c, func() error {
err := next(c)
body := c.Get("body").(string)
if err == nil {
status := c.Response().Status()
//request is ok, but server failed
if status > 499 {
err = fmt.Errorf("Server failed to process response with status code 500: %s", body)
}
}
if err != nil {
if httpErr, ok := err.(*echo.HTTPError); ok {
if httpErr.Code < 500 {
return err
}
}
tags := map[string]string{
"source": "app",
"type": "Internal server error",
"url": c.Request().URI(),
"status": fmt.Sprintf("%d", c.Response().Status()),
"body": body,
}
raven.SetHttpContext(newHTTPFromCtx(c))
raven.CaptureError(err, tags)
}
return err
})
}
}
func getHTTPParams(ctx echo.Context) (string, map[string]string, string) {
qs := ""
if len(ctx.QueryParams()) > 0 {
qsBytes, _ := json.Marshal(ctx.QueryParams())
qs = string(qsBytes)
}
headers := map[string]string{}
for _, headerKey := range ctx.Response().Header().Keys() {
headers[string(headerKey)] = string(ctx.Response().Header().Get(headerKey))
}
cookies := string(ctx.Response().Header().Get("Cookie"))
return qs, headers, cookies
}
func newHTTPFromCtx(ctx echo.Context) *raven.Http {
qs, headers, cookies := getHTTPParams(ctx)
h := &raven.Http{
Method: string(ctx.Request().Method()),
Cookies: cookies,
Query: qs,
URL: ctx.Request().URI(),
Headers: headers,
}
return h
}
//NewRecoveryMiddleware returns a configured middleware
func NewRecoveryMiddleware(onError func(error, []byte)) *RecoveryMiddleware {
return &RecoveryMiddleware{
OnError: onError,
}
}
//RecoveryMiddleware recovers from errors
type RecoveryMiddleware struct {
OnError func(error, []byte)
}
//Serve executes on error handler when errors happen
func (r *RecoveryMiddleware) Serve(next echo.HandlerFunc) echo.HandlerFunc {
return func(c echo.Context) error {
defer func() {
if err := recover(); err != nil {
eError, ok := err.(error)
if !ok {
eError = fmt.Errorf(fmt.Sprintf("%v", err))
}
if r.OnError != nil {
r.OnError(eError, debug.Stack())
}
c.Error(eError)
}
}()
return next(c)
}
}
// NewLoggerMiddleware returns the logger middleware
func NewLoggerMiddleware(theLogger zap.Logger) *LoggerMiddleware {
l := &LoggerMiddleware{Logger: theLogger}
return l
}
//LoggerMiddleware is responsible for logging to Zap all requests
type LoggerMiddleware struct {
Logger zap.Logger
}
// Serve serves the middleware
func (l *LoggerMiddleware) Serve(next echo.HandlerFunc) echo.HandlerFunc {
return func(c echo.Context) error {
l := l.Logger.With(
zap.String("source", "request"),
)
//all except latency to string
var ip, method, path string
var status int
var latency time.Duration
var startTime, endTime time.Time
path = c.Path()
method = c.Request().Method()
startTime = time.Now()
err := next(c)
body := c.Get("body").(string)
//no time.Since in order to format it well after
endTime = time.Now()
latency = endTime.Sub(startTime)
status = c.Response().Status()
ip = c.Request().RemoteAddress()
route := c.Get("route")
if route == nil {
log.D(l, "Route does not have route set in ctx")
return err
}
reqLog := l.With(
zap.String("route", route.(string)),
zap.Time("endTime", endTime),
zap.Int("statusCode", status),
zap.Duration("latency", latency),
zap.String("ip", ip),
zap.String("method", method),
zap.String("path", path),
zap.String("body", body),
)
//request failed
if status > 399 && status < 500 {
log.W(reqLog, "Request failed.")
return err
}
//request is ok, but server failed
if status > 499 {
log.E(reqLog, "Response failed.")
return err
}
//Everything went ok
if cm := reqLog.Check(zap.InfoLevel, "Request successful."); cm.OK() {
cm.Write()
}
return err
}
}
//NewNewRelicMiddleware returns the logger middleware
func NewNewRelicMiddleware(app *App, theLogger zap.Logger) *NewRelicMiddleware {
l := &NewRelicMiddleware{App: app, Logger: theLogger}
return l
}
//NewRelicMiddleware is responsible for logging to Zap all requests
type NewRelicMiddleware struct {
App *App
Logger zap.Logger
}
// Serve serves the middleware
func (nr *NewRelicMiddleware) Serve(next echo.HandlerFunc) echo.HandlerFunc {
return func(c echo.Context) error {
method := c.Request().Method()
route := fmt.Sprintf("%s %s", method, c.Path())
txn := nr.App.NewRelic.StartTransaction(route, nil, nil)
c.Set("txn", txn)
defer func() {
c.Set("txn", nil)
txn.End()
}()
err := next(c)
if err != nil {
txn.NoticeError(err)
return err
}
return nil
}
}