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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"
"context"
"errors"
"fmt"
"io/ioutil"
"net/http"
"time"
pb "github.com/coreos/etcd/etcdserver/etcdserverpb"
"github.com/coreos/etcd/lease"
"github.com/coreos/etcd/lease/leasepb"
"github.com/coreos/etcd/pkg/httputil"
)
var (
LeasePrefix = "/leases"
LeaseInternalPrefix = "/leases/internal"
applyTimeout = time.Second
ErrLeaseHTTPTimeout = errors.New("waiting for node to catch up its applied index has timed out")
)
// NewHandler returns an http Handler for lease renewals
func NewHandler(l lease.Lessor, waitch func() <-chan struct{}) http.Handler {
return &leaseHandler{l, waitch}
}
type leaseHandler struct {
l lease.Lessor
waitch func() <-chan struct{}
}
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
}
var v []byte
switch r.URL.Path {
case LeasePrefix:
lreq := pb.LeaseKeepAliveRequest{}
if err := lreq.Unmarshal(b); err != nil {
http.Error(w, "error unmarshalling request", http.StatusBadRequest)
return
}
select {
case <-h.waitch():
case <-time.After(applyTimeout):
http.Error(w, ErrLeaseHTTPTimeout.Error(), http.StatusRequestTimeout)
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
}
case LeaseInternalPrefix:
lreq := leasepb.LeaseInternalRequest{}
if err := lreq.Unmarshal(b); err != nil {
http.Error(w, "error unmarshalling request", http.StatusBadRequest)
return
}
select {
case <-h.waitch():
case <-time.After(applyTimeout):
http.Error(w, ErrLeaseHTTPTimeout.Error(), http.StatusRequestTimeout)
return
}
l := h.l.Lookup(lease.LeaseID(lreq.LeaseTimeToLiveRequest.ID))
if l == nil {
http.Error(w, lease.ErrLeaseNotFound.Error(), http.StatusNotFound)
return
}
// TODO: fill out ResponseHeader
resp := &leasepb.LeaseInternalResponse{
LeaseTimeToLiveResponse: &pb.LeaseTimeToLiveResponse{
Header: &pb.ResponseHeader{},
ID: lreq.LeaseTimeToLiveRequest.ID,
TTL: int64(l.Remaining().Seconds()),
GrantedTTL: l.TTL(),
},
}
if lreq.LeaseTimeToLiveRequest.Keys {
ks := l.Keys()
kbs := make([][]byte, len(ks))
for i := range ks {
kbs[i] = []byte(ks[i])
}
resp.LeaseTimeToLiveResponse.Keys = kbs
}
v, err = resp.Marshal()
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
default:
http.Error(w, fmt.Sprintf("unknown request path %q", r.URL.Path), http.StatusBadRequest)
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(ctx context.Context, id lease.LeaseID, url string, rt http.RoundTripper) (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}
req, err := http.NewRequest("POST", url, bytes.NewReader(lreq))
if err != nil {
return -1, err
}
req.Header.Set("Content-Type", "application/protobuf")
req.Cancel = ctx.Done()
resp, err := cc.Do(req)
if err != nil {
return -1, err
}
b, err := readResponse(resp)
if err != nil {
return -1, err
}
if resp.StatusCode == http.StatusRequestTimeout {
return -1, ErrLeaseHTTPTimeout
}
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
}
// TimeToLiveHTTP retrieves lease information of the given lease ID.
func TimeToLiveHTTP(ctx context.Context, id lease.LeaseID, keys bool, url string, rt http.RoundTripper) (*leasepb.LeaseInternalResponse, error) {
// will post lreq protobuf to leader
lreq, err := (&leasepb.LeaseInternalRequest{
LeaseTimeToLiveRequest: &pb.LeaseTimeToLiveRequest{
ID: int64(id),
Keys: keys,
},
}).Marshal()
if err != nil {
return nil, err
}
req, err := http.NewRequest("POST", url, bytes.NewReader(lreq))
if err != nil {
return nil, err
}
req.Header.Set("Content-Type", "application/protobuf")
req = req.WithContext(ctx)
cc := &http.Client{Transport: rt}
var b []byte
// buffer errc channel so that errc don't block inside the go routinue
resp, err := cc.Do(req)
if err != nil {
return nil, err
}
b, err = readResponse(resp)
if err != nil {
return nil, err
}
if resp.StatusCode == http.StatusRequestTimeout {
return nil, ErrLeaseHTTPTimeout
}
if resp.StatusCode == http.StatusNotFound {
return nil, lease.ErrLeaseNotFound
}
if resp.StatusCode != http.StatusOK {
return nil, fmt.Errorf("lease: unknown error(%s)", string(b))
}
lresp := &leasepb.LeaseInternalResponse{}
if err := lresp.Unmarshal(b); err != nil {
return nil, fmt.Errorf(`lease: %v. data = "%s"`, err, string(b))
}
if lresp.LeaseTimeToLiveResponse.ID != int64(id) {
return nil, fmt.Errorf("lease: renew id mismatch")
}
return lresp, nil
}
func readResponse(resp *http.Response) (b []byte, err error) {
b, err = ioutil.ReadAll(resp.Body)
httputil.GracefulClose(resp)
return
}