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http.go
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http.go
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// Copyright 2016 The etcd Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package leasehttp
import (
"bytes"
"fmt"
"io/ioutil"
"net/http"
"time"
pb "github.com/coreos/etcd/etcdserver/etcdserverpb"
"github.com/coreos/etcd/lease"
)
// NewHandler returns an http Handler for lease renewals
func NewHandler(l lease.Lessor) http.Handler {
return &leaseHandler{l}
}
type leaseHandler struct{ l lease.Lessor }
func (h *leaseHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if r.Method != "POST" {
http.Error(w, "Method Not Allowed", http.StatusMethodNotAllowed)
return
}
b, err := ioutil.ReadAll(r.Body)
if err != nil {
http.Error(w, "error reading body", http.StatusBadRequest)
return
}
lreq := pb.LeaseKeepAliveRequest{}
if err := lreq.Unmarshal(b); err != nil {
http.Error(w, "error unmarshalling request", http.StatusBadRequest)
return
}
ttl, err := h.l.Renew(lease.LeaseID(lreq.ID))
if err != nil {
if err == lease.ErrLeaseNotFound {
http.Error(w, err.Error(), http.StatusNotFound)
return
}
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
// TODO: fill out ResponseHeader
resp := &pb.LeaseKeepAliveResponse{ID: lreq.ID, TTL: ttl}
v, err := resp.Marshal()
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/protobuf")
w.Write(v)
}
// RenewHTTP renews a lease at a given primary server.
// TODO: Batch request in future?
func RenewHTTP(id lease.LeaseID, url string, rt http.RoundTripper, timeout time.Duration) (int64, error) {
// will post lreq protobuf to leader
lreq, err := (&pb.LeaseKeepAliveRequest{ID: int64(id)}).Marshal()
if err != nil {
return -1, err
}
cc := &http.Client{Transport: rt, Timeout: timeout}
resp, err := cc.Post(url, "application/protobuf", bytes.NewReader(lreq))
if err != nil {
// TODO detect if leader failed and retry?
return -1, err
}
b, err := ioutil.ReadAll(resp.Body)
if err != nil {
return -1, err
}
if resp.StatusCode == http.StatusNotFound {
return -1, lease.ErrLeaseNotFound
}
if resp.StatusCode != http.StatusOK {
return -1, fmt.Errorf("lease: unknown error(%s)", string(b))
}
lresp := &pb.LeaseKeepAliveResponse{}
if err := lresp.Unmarshal(b); err != nil {
return -1, fmt.Errorf(`lease: %v. data = "%s"`, err, string(b))
}
if lresp.ID != int64(id) {
return -1, fmt.Errorf("lease: renew id mismatch")
}
return lresp.TTL, nil
}