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// 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 raft
import (
"bytes"
"fmt"
pb "github.com/coreos/etcd/raft/raftpb"
)
func (st StateType) MarshalJSON() ([]byte, error) {
return []byte(fmt.Sprintf("%q", st.String())), nil
}
// uint64Slice implements sort interface
type uint64Slice []uint64
func (p uint64Slice) Len() int { return len(p) }
func (p uint64Slice) Less(i, j int) bool { return p[i] < p[j] }
func (p uint64Slice) Swap(i, j int) { p[i], p[j] = p[j], p[i] }
func min(a, b uint64) uint64 {
if a > b {
return b
}
return a
}
func max(a, b uint64) uint64 {
if a > b {
return a
}
return b
}
func IsLocalMsg(m pb.Message) bool {
return m.Type == pb.MsgHup || m.Type == pb.MsgBeat || m.Type == pb.MsgUnreachable || m.Type == pb.MsgSnapStatus || m.Type == pb.MsgCheckQuorum
}
func IsResponseMsg(m pb.Message) bool {
return m.Type == pb.MsgAppResp || m.Type == pb.MsgVoteResp || m.Type == pb.MsgHeartbeatResp || m.Type == pb.MsgUnreachable
}
// EntryFormatter can be implemented by the application to provide human-readable formatting
// of entry data. Nil is a valid EntryFormatter and will use a default format.
type EntryFormatter func([]byte) string
// DescribeMessage returns a concise human-readable description of a
// Message for debugging.
func DescribeMessage(m pb.Message, f EntryFormatter) string {
var buf bytes.Buffer
fmt.Fprintf(&buf, "%x->%x %v Term:%d Log:%d/%d", m.From, m.To, m.Type, m.Term, m.LogTerm, m.Index)
if m.Reject {
fmt.Fprintf(&buf, " Rejected")
if m.RejectHint != 0 {
fmt.Fprintf(&buf, "(Hint:%d)", m.RejectHint)
}
}
if m.Commit != 0 {
fmt.Fprintf(&buf, " Commit:%d", m.Commit)
}
if len(m.Entries) > 0 {
fmt.Fprintf(&buf, " Entries:[")
for i, e := range m.Entries {
if i != 0 {
buf.WriteString(", ")
}
buf.WriteString(DescribeEntry(e, f))
}
fmt.Fprintf(&buf, "]")
}
if !IsEmptySnap(m.Snapshot) {
fmt.Fprintf(&buf, " Snapshot:%v", m.Snapshot)
}
return buf.String()
}
// DescribeEntry returns a concise human-readable description of an
// Entry for debugging.
func DescribeEntry(e pb.Entry, f EntryFormatter) string {
var formatted string
if e.Type == pb.EntryNormal && f != nil {
formatted = f(e.Data)
} else {
formatted = fmt.Sprintf("%q", e.Data)
}
return fmt.Sprintf("%d/%d %s %s", e.Term, e.Index, e.Type, formatted)
}
func limitSize(ents []pb.Entry, maxSize uint64) []pb.Entry {
if len(ents) == 0 {
return ents
}
size := ents[0].Size()
var limit int
for limit = 1; limit < len(ents); limit++ {
size += ents[limit].Size()
if uint64(size) > maxSize {
break
}
}
return ents[:limit]
}
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