106 lines
2.6 KiB
Go
106 lines
2.6 KiB
Go
// Copyright 2018 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package main
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import (
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"context"
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"net/http"
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"time"
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"github.com/google/uuid"
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"github.com/sirupsen/logrus"
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)
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type ctxKeyLog struct{}
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type ctxKeyRequestID struct{}
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type logHandler struct {
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log *logrus.Logger
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next http.Handler
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}
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type responseRecorder struct {
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b int
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status int
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w http.ResponseWriter
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}
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func (r *responseRecorder) Header() http.Header { return r.w.Header() }
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func (r *responseRecorder) Write(p []byte) (int, error) {
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if r.status == 0 {
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r.status = http.StatusOK
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}
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n, err := r.w.Write(p)
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r.b += n
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return n, err
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}
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func (r *responseRecorder) WriteHeader(statusCode int) {
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r.status = statusCode
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r.w.WriteHeader(statusCode)
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}
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func (lh *logHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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ctx := r.Context()
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requestID, _ := uuid.NewRandom()
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ctx = context.WithValue(ctx, ctxKeyRequestID{}, requestID.String())
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start := time.Now()
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rr := &responseRecorder{w: w}
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log := lh.log.WithFields(logrus.Fields{
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"http.req.path": r.URL.Path,
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"http.req.method": r.Method,
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"http.req.id": requestID.String(),
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})
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if v, ok := r.Context().Value(ctxKeySessionID{}).(string); ok {
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log = log.WithField("session", v)
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}
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log.Debug("request started")
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defer func() {
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log.WithFields(logrus.Fields{
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"http.resp.took_ms": int64(time.Since(start) / time.Millisecond),
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"http.resp.status": rr.status,
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"http.resp.bytes": rr.b}).Debugf("request complete")
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}()
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ctx = context.WithValue(ctx, ctxKeyLog{}, log)
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r = r.WithContext(ctx)
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lh.next.ServeHTTP(rr, r)
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}
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func ensureSessionID(next http.Handler) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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var sessionID string
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c, err := r.Cookie(cookieSessionID)
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if err == http.ErrNoCookie {
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u, _ := uuid.NewRandom()
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sessionID = u.String()
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http.SetCookie(w, &http.Cookie{
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Name: cookieSessionID,
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Value: sessionID,
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MaxAge: cookieMaxAge,
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})
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} else if err != nil {
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return
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} else {
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sessionID = c.Value
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}
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ctx := context.WithValue(r.Context(), ctxKeySessionID{}, sessionID)
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r = r.WithContext(ctx)
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next.ServeHTTP(w, r)
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}
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}
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