102 lines
3.0 KiB
Go
102 lines
3.0 KiB
Go
// Copyright 2015 CoreOS, Inc.
|
|
//
|
|
// 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 rafthttp
|
|
|
|
import (
|
|
"encoding/binary"
|
|
"fmt"
|
|
"io"
|
|
"net/http"
|
|
|
|
"github.com/coreos/etcd/Godeps/_workspace/src/github.com/coreos/go-semver/semver"
|
|
"github.com/coreos/etcd/raft/raftpb"
|
|
"github.com/coreos/etcd/version"
|
|
)
|
|
|
|
func writeEntryTo(w io.Writer, ent *raftpb.Entry) error {
|
|
size := ent.Size()
|
|
if err := binary.Write(w, binary.BigEndian, uint64(size)); err != nil {
|
|
return err
|
|
}
|
|
b, err := ent.Marshal()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
_, err = w.Write(b)
|
|
return err
|
|
}
|
|
|
|
func readEntryFrom(r io.Reader, ent *raftpb.Entry) error {
|
|
var l uint64
|
|
if err := binary.Read(r, binary.BigEndian, &l); err != nil {
|
|
return err
|
|
}
|
|
buf := make([]byte, int(l))
|
|
if _, err := io.ReadFull(r, buf); err != nil {
|
|
return err
|
|
}
|
|
return ent.Unmarshal(buf)
|
|
}
|
|
|
|
// compareMajorMinorVersion returns an integer comparing two versions based on
|
|
// their major and minor version. The result will be 0 if a==b, -1 if a < b,
|
|
// and 1 if a > b.
|
|
func compareMajorMinorVersion(a, b *semver.Version) int {
|
|
na := &semver.Version{Major: a.Major, Minor: a.Minor}
|
|
nb := &semver.Version{Major: b.Major, Minor: b.Minor}
|
|
switch {
|
|
case na.LessThan(*nb):
|
|
return -1
|
|
case nb.LessThan(*na):
|
|
return 1
|
|
default:
|
|
return 0
|
|
}
|
|
}
|
|
|
|
// serverVersion returns the server version from the given header.
|
|
func serverVersion(h http.Header) *semver.Version {
|
|
verStr := h.Get("X-Server-Version")
|
|
// backward compatibility with etcd 2.0
|
|
if verStr == "" {
|
|
verStr = "2.0.0"
|
|
}
|
|
return semver.Must(semver.NewVersion(verStr))
|
|
}
|
|
|
|
// serverVersion returns the min cluster version from the given header.
|
|
func minClusterVersion(h http.Header) *semver.Version {
|
|
verStr := h.Get("X-Min-Cluster-Version")
|
|
// backward compatibility with etcd 2.0
|
|
if verStr == "" {
|
|
verStr = "2.0.0"
|
|
}
|
|
return semver.Must(semver.NewVersion(verStr))
|
|
}
|
|
|
|
// checkVersionCompability checks whether the given version is compatible
|
|
// with the local version.
|
|
func checkVersionCompability(name string, server, minCluster *semver.Version) error {
|
|
localServer := semver.Must(semver.NewVersion(version.Version))
|
|
localMinCluster := semver.Must(semver.NewVersion(version.MinClusterVersion))
|
|
if compareMajorMinorVersion(server, localMinCluster) == -1 {
|
|
return fmt.Errorf("remote version is too low: remote[%s]=%s, local=%s", name, server, localServer)
|
|
}
|
|
if compareMajorMinorVersion(minCluster, localServer) == 1 {
|
|
return fmt.Errorf("local version is too low: remote[%s]=%s, local=%s", name, server, localServer)
|
|
}
|
|
return nil
|
|
}
|