go.etcd.io/etcd@v3.3.27+incompatible/etcdserver/api/v2http/capability.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 "fmt" 19 "net/http" 20 21 "github.com/coreos/etcd/etcdserver/api" 22 "github.com/coreos/etcd/etcdserver/api/v2http/httptypes" 23 ) 24 25 func capabilityHandler(c api.Capability, fn func(http.ResponseWriter, *http.Request)) http.HandlerFunc { 26 return func(w http.ResponseWriter, r *http.Request) { 27 if !api.IsCapabilityEnabled(c) { 28 notCapable(w, r, c) 29 return 30 } 31 fn(w, r) 32 } 33 } 34 35 func notCapable(w http.ResponseWriter, r *http.Request, c api.Capability) { 36 herr := httptypes.NewHTTPError(http.StatusInternalServerError, fmt.Sprintf("Not capable of accessing %s feature during rolling upgrades.", c)) 37 if err := herr.WriteTo(w); err != nil { 38 plog.Debugf("error writing HTTPError (%v) to %s", err, r.RemoteAddr) 39 } 40 }