go.etcd.io/etcd@v3.3.27+incompatible/etcdserver/api/v2http/http.go (about)

     1  // Copyright 2015 The etcd Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package v2http
    16  
    17  import (
    18  	"math"
    19  	"net/http"
    20  	"strings"
    21  	"time"
    22  
    23  	"github.com/coreos/etcd/etcdserver/api/etcdhttp"
    24  	"github.com/coreos/etcd/etcdserver/api/v2http/httptypes"
    25  	"github.com/coreos/etcd/etcdserver/auth"
    26  	"github.com/coreos/etcd/pkg/logutil"
    27  
    28  	"github.com/coreos/pkg/capnslog"
    29  )
    30  
    31  const (
    32  	// time to wait for a Watch request
    33  	defaultWatchTimeout = time.Duration(math.MaxInt64)
    34  )
    35  
    36  var (
    37  	plog = capnslog.NewPackageLogger("github.com/coreos/etcd", "etcdserver/api/v2http")
    38  	mlog = logutil.NewMergeLogger(plog)
    39  )
    40  
    41  func writeError(w http.ResponseWriter, r *http.Request, err error) {
    42  	if err == nil {
    43  		return
    44  	}
    45  	if e, ok := err.(auth.Error); ok {
    46  		herr := httptypes.NewHTTPError(e.HTTPStatus(), e.Error())
    47  		if et := herr.WriteTo(w); et != nil {
    48  			plog.Debugf("error writing HTTPError (%v) to %s", et, r.RemoteAddr)
    49  		}
    50  		return
    51  	}
    52  	etcdhttp.WriteError(w, r, err)
    53  }
    54  
    55  // allowMethod verifies that the given method is one of the allowed methods,
    56  // and if not, it writes an error to w.  A boolean is returned indicating
    57  // whether or not the method is allowed.
    58  func allowMethod(w http.ResponseWriter, m string, ms ...string) bool {
    59  	for _, meth := range ms {
    60  		if m == meth {
    61  			return true
    62  		}
    63  	}
    64  	w.Header().Set("Allow", strings.Join(ms, ","))
    65  	http.Error(w, "Method Not Allowed", http.StatusMethodNotAllowed)
    66  	return false
    67  }
    68  
    69  func requestLogger(handler http.Handler) http.Handler {
    70  	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
    71  		plog.Debugf("[%s] %s remote:%s", r.Method, r.RequestURI, r.RemoteAddr)
    72  		handler.ServeHTTP(w, r)
    73  	})
    74  }