2015-01-25 06:19:16 +03:00
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// Copyright 2015 CoreOS, Inc.
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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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2014-11-19 00:53:14 +03:00
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package rafthttp
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import (
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"encoding/binary"
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2015-06-02 21:46:36 +03:00
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"fmt"
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2014-11-19 00:53:14 +03:00
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"io"
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2015-06-02 21:46:36 +03:00
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"net/http"
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2014-11-19 00:53:14 +03:00
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2015-06-02 21:46:36 +03:00
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"github.com/coreos/etcd/Godeps/_workspace/src/github.com/coreos/go-semver/semver"
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2014-11-19 00:53:14 +03:00
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"github.com/coreos/etcd/raft/raftpb"
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2015-06-02 21:46:36 +03:00
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"github.com/coreos/etcd/version"
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2014-11-19 00:53:14 +03:00
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)
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2015-02-23 05:42:52 +03:00
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func writeEntryTo(w io.Writer, ent *raftpb.Entry) error {
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2015-02-15 19:44:34 +03:00
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size := ent.Size()
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if err := binary.Write(w, binary.BigEndian, uint64(size)); err != nil {
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2014-11-19 00:53:14 +03:00
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return err
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}
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2015-02-15 19:44:34 +03:00
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b, err := ent.Marshal()
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if err != nil {
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return err
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2014-11-19 00:53:14 +03:00
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}
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2015-02-15 19:44:34 +03:00
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_, err = w.Write(b)
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return err
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2014-11-19 00:53:14 +03:00
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}
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2015-02-23 05:42:52 +03:00
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func readEntryFrom(r io.Reader, ent *raftpb.Entry) error {
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2015-02-15 19:44:34 +03:00
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var l uint64
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if err := binary.Read(r, binary.BigEndian, &l); err != nil {
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2014-11-19 00:53:14 +03:00
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return err
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}
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2015-02-15 19:44:34 +03:00
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buf := make([]byte, int(l))
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if _, err := io.ReadFull(r, buf); err != nil {
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2014-11-19 00:53:14 +03:00
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return err
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}
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2015-02-15 19:44:34 +03:00
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return ent.Unmarshal(buf)
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2014-11-19 00:53:14 +03:00
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}
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2015-06-02 21:46:36 +03:00
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// compareMajorMinorVersion returns an integer comparing two versions based on
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// their major and minor version. The result will be 0 if a==b, -1 if a < b,
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// and 1 if a > b.
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func compareMajorMinorVersion(a, b *semver.Version) int {
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na := &semver.Version{Major: a.Major, Minor: a.Minor}
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nb := &semver.Version{Major: b.Major, Minor: b.Minor}
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switch {
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case na.LessThan(*nb):
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return -1
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case nb.LessThan(*na):
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return 1
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default:
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return 0
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}
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}
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// serverVersion returns the server version from the given header.
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func serverVersion(h http.Header) *semver.Version {
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verStr := h.Get("X-Server-Version")
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// backward compatibility with etcd 2.0
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if verStr == "" {
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verStr = "2.0.0"
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}
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return semver.Must(semver.NewVersion(verStr))
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}
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// serverVersion returns the min cluster version from the given header.
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func minClusterVersion(h http.Header) *semver.Version {
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verStr := h.Get("X-Min-Cluster-Version")
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// backward compatibility with etcd 2.0
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if verStr == "" {
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verStr = "2.0.0"
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}
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return semver.Must(semver.NewVersion(verStr))
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}
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// checkVersionCompability checks whether the given version is compatible
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// with the local version.
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func checkVersionCompability(name string, server, minCluster *semver.Version) error {
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localServer := semver.Must(semver.NewVersion(version.Version))
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localMinCluster := semver.Must(semver.NewVersion(version.MinClusterVersion))
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if compareMajorMinorVersion(server, localMinCluster) == -1 {
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return fmt.Errorf("remote version is too low: remote[%s]=%s, local=%s", name, server, localServer)
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}
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if compareMajorMinorVersion(minCluster, localServer) == 1 {
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return fmt.Errorf("local version is too low: remote[%s]=%s, local=%s", name, server, localServer)
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}
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return nil
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}
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