228 lines
5.8 KiB
Go
228 lines
5.8 KiB
Go
// Copyright 2016 The etcd Authors
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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 leasehttp
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import (
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"bytes"
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"fmt"
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"io/ioutil"
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"net/http"
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"time"
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pb "github.com/coreos/etcd/etcdserver/etcdserverpb"
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"github.com/coreos/etcd/lease"
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"github.com/coreos/etcd/lease/leasepb"
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"github.com/coreos/etcd/pkg/httputil"
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"golang.org/x/net/context"
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)
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var (
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LeasePrefix = "/leases"
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LeaseInternalPrefix = "/leases/internal"
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)
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// NewHandler returns an http Handler for lease renewals
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func NewHandler(l lease.Lessor) http.Handler {
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return &leaseHandler{l}
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}
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type leaseHandler struct{ l lease.Lessor }
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func (h *leaseHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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if r.Method != "POST" {
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http.Error(w, "Method Not Allowed", http.StatusMethodNotAllowed)
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return
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}
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b, err := ioutil.ReadAll(r.Body)
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if err != nil {
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http.Error(w, "error reading body", http.StatusBadRequest)
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return
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}
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var v []byte
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switch r.URL.Path {
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case LeasePrefix:
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lreq := pb.LeaseKeepAliveRequest{}
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if err := lreq.Unmarshal(b); err != nil {
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http.Error(w, "error unmarshalling request", http.StatusBadRequest)
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return
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}
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ttl, err := h.l.Renew(lease.LeaseID(lreq.ID))
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if err != nil {
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if err == lease.ErrLeaseNotFound {
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http.Error(w, err.Error(), http.StatusNotFound)
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return
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}
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http.Error(w, err.Error(), http.StatusBadRequest)
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return
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}
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// TODO: fill out ResponseHeader
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resp := &pb.LeaseKeepAliveResponse{ID: lreq.ID, TTL: ttl}
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v, err = resp.Marshal()
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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case LeaseInternalPrefix:
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lreq := leasepb.LeaseInternalRequest{}
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if err := lreq.Unmarshal(b); err != nil {
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http.Error(w, "error unmarshalling request", http.StatusBadRequest)
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return
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}
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l := h.l.Lookup(lease.LeaseID(lreq.LeaseTimeToLiveRequest.ID))
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if l == nil {
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http.Error(w, lease.ErrLeaseNotFound.Error(), http.StatusNotFound)
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return
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}
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// TODO: fill out ResponseHeader
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resp := &leasepb.LeaseInternalResponse{
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LeaseTimeToLiveResponse: &pb.LeaseTimeToLiveResponse{
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Header: &pb.ResponseHeader{},
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ID: lreq.LeaseTimeToLiveRequest.ID,
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TTL: int64(l.Remaining().Seconds()),
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GrantedTTL: l.TTL(),
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},
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}
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if lreq.LeaseTimeToLiveRequest.Keys {
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ks := l.Keys()
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kbs := make([][]byte, len(ks))
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for i := range ks {
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kbs[i] = []byte(ks[i])
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}
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resp.LeaseTimeToLiveResponse.Keys = kbs
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}
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v, err = resp.Marshal()
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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default:
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http.Error(w, fmt.Sprintf("unknown request path %q", r.URL.Path), http.StatusBadRequest)
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return
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}
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w.Header().Set("Content-Type", "application/protobuf")
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w.Write(v)
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}
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// RenewHTTP renews a lease at a given primary server.
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// TODO: Batch request in future?
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func RenewHTTP(id lease.LeaseID, url string, rt http.RoundTripper, timeout time.Duration) (int64, error) {
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// will post lreq protobuf to leader
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lreq, err := (&pb.LeaseKeepAliveRequest{ID: int64(id)}).Marshal()
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if err != nil {
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return -1, err
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}
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cc := &http.Client{Transport: rt, Timeout: timeout}
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resp, err := cc.Post(url, "application/protobuf", bytes.NewReader(lreq))
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if err != nil {
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return -1, err
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}
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b, err := readResponse(resp)
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if err != nil {
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return -1, err
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}
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if resp.StatusCode == http.StatusNotFound {
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return -1, lease.ErrLeaseNotFound
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}
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if resp.StatusCode != http.StatusOK {
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return -1, fmt.Errorf("lease: unknown error(%s)", string(b))
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}
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lresp := &pb.LeaseKeepAliveResponse{}
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if err := lresp.Unmarshal(b); err != nil {
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return -1, fmt.Errorf(`lease: %v. data = "%s"`, err, string(b))
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}
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if lresp.ID != int64(id) {
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return -1, fmt.Errorf("lease: renew id mismatch")
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}
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return lresp.TTL, nil
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}
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// TimeToLiveHTTP retrieves lease information of the given lease ID.
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func TimeToLiveHTTP(ctx context.Context, id lease.LeaseID, keys bool, url string, rt http.RoundTripper) (*leasepb.LeaseInternalResponse, error) {
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// will post lreq protobuf to leader
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lreq, err := (&leasepb.LeaseInternalRequest{&pb.LeaseTimeToLiveRequest{ID: int64(id), Keys: keys}}).Marshal()
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if err != nil {
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return nil, err
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}
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req, err := http.NewRequest("POST", url, bytes.NewReader(lreq))
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if err != nil {
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return nil, err
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}
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req.Header.Set("Content-Type", "application/protobuf")
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cancel := httputil.RequestCanceler(req)
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cc := &http.Client{Transport: rt}
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var b []byte
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errc := make(chan error)
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go func() {
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resp, err := cc.Do(req)
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if err != nil {
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errc <- err
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return
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}
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b, err = readResponse(resp)
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if err != nil {
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errc <- err
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return
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}
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if resp.StatusCode == http.StatusNotFound {
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errc <- lease.ErrLeaseNotFound
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return
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}
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if resp.StatusCode != http.StatusOK {
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errc <- fmt.Errorf("lease: unknown error(%s)", string(b))
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return
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}
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errc <- nil
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}()
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select {
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case derr := <-errc:
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if derr != nil {
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return nil, derr
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}
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case <-ctx.Done():
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cancel()
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return nil, ctx.Err()
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}
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lresp := &leasepb.LeaseInternalResponse{}
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if err := lresp.Unmarshal(b); err != nil {
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return nil, fmt.Errorf(`lease: %v. data = "%s"`, err, string(b))
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}
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if lresp.LeaseTimeToLiveResponse.ID != int64(id) {
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return nil, fmt.Errorf("lease: renew id mismatch")
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}
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return lresp, nil
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}
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func readResponse(resp *http.Response) (b []byte, err error) {
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b, err = ioutil.ReadAll(resp.Body)
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httputil.GracefulClose(resp)
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return
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}
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