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raft_logs.go
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raft_logs.go
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package main
//go:generate ./generate_msgtypes.sh
import (
"bytes"
"encoding/json"
"fmt"
"os"
"path/filepath"
"strings"
"github.com/hashicorp/go-msgpack/codec"
"github.com/hashicorp/nomad/nomad/structs"
"github.com/hashicorp/raft"
raftboltdb "github.com/hashicorp/raft-boltdb"
)
type RaftLogsCommand struct {
}
func (a *RaftLogsCommand) Help() string {
helpText := `
Usage: nomad-debug raft logs <path_to_nomad_dir>
Emits the raft logs content in json form.
`
return strings.TrimSpace(helpText)
}
func (c *RaftLogsCommand) Name() string { return "raft logs" }
func (c *RaftLogsCommand) Synopsis() string {
return "output content of raft log"
}
func (c *RaftLogsCommand) Run(args []string) int {
if len(args) != 1 {
return 1
}
p := filepath.Join(args[0], "server", "raft", "raft.db")
store, firstIdx, lastIdx, err := raftState(p)
if err != nil {
fmt.Fprintf(os.Stderr, "failed to open raft logs: %v\n", err)
return 1
}
defer store.Close()
arr := make([]*logMessage, 0, lastIdx-firstIdx+1)
for i := firstIdx; i <= lastIdx; i++ {
var e raft.Log
err := store.GetLog(i, &e)
if err != nil {
fmt.Fprintf(os.Stderr, "failed to read log entry at index %d: %v\n", i, err)
continue
//return 1
}
m, err := decode(&e)
if err != nil {
fmt.Fprintf(os.Stderr, "failed to decode log entry at index %d: %v\n", i, err)
continue
//return 1
}
arr = append(arr, m)
}
enc := json.NewEncoder(os.Stdout)
enc.SetIndent("", " ")
if err := enc.Encode(arr); err != nil {
fmt.Fprintf(os.Stderr, "failed to encode output: %v\n", err)
return 1
}
return 0
}
func raftState(p string) (store *raftboltdb.BoltStore, firstIdx uint64, lastIdx uint64, err error) {
s, err := raftboltdb.NewBoltStore(p)
if err != nil {
return nil, 0, 0, fmt.Errorf("failed to open raft logs: %v", err)
}
firstIdx, err = s.FirstIndex()
if err != nil {
return nil, 0, 0, fmt.Errorf("failed to fetch first index: %v", err)
}
lastIdx, err = s.LastIndex()
if err != nil {
return nil, 0, 0, fmt.Errorf("failed to fetch last index: %v", err)
}
return s, firstIdx, lastIdx, nil
}
type logMessage struct {
LogType string
Term uint64
Index uint64
CommandType string `json:",omitempty"`
IgnoreUnknownTypeFlag bool `json:",omitempty"`
Body interface{} `json:",omitempty"`
}
func decode(e *raft.Log) (*logMessage, error) {
m := &logMessage{
LogType: logTypes[e.Type],
Term: e.Term,
Index: e.Index,
}
if m.LogType == "" {
m.LogType = fmt.Sprintf("%d", e.Type)
}
var data []byte
if e.Type == raft.LogCommand {
if len(e.Data) == 0 {
return nil, fmt.Errorf("command did not include data")
}
msgType := structs.MessageType(e.Data[0])
m.CommandType = msgTypeNames[msgType & ^structs.IgnoreUnknownTypeFlag]
m.IgnoreUnknownTypeFlag = (msgType & structs.IgnoreUnknownTypeFlag) != 0
data = e.Data[1:]
} else {
data = e.Data
}
if len(data) != 0 {
decoder := codec.NewDecoder(bytes.NewReader(data), MsgpackHandle)
var v interface{}
var err error
if m.CommandType == msgTypeNames[structs.JobBatchDeregisterRequestType] {
var vr structs.JobBatchDeregisterRequest
err = decoder.Decode(&vr)
v = jsonifyJobBatchDeregisterRequest(&vr)
} else {
var vr interface{}
err = decoder.Decode(&vr)
v = vr
}
if err != nil {
fmt.Fprintf(os.Stderr, "failed to decode log entry at index %d: failed to decode body of %v.%v %v\n", e.Index, e.Type, m.CommandType, err)
v = "FAILED TO DECODE DATA"
}
fixTime(v)
m.Body = v
}
return m, nil
}
func jsonifyJobBatchDeregisterRequest(v *structs.JobBatchDeregisterRequest) interface{} {
var data struct {
Jobs map[string]*structs.JobDeregisterOptions
Evals []*structs.Evaluation
structs.WriteRequest
}
data.Evals = v.Evals
data.WriteRequest = v.WriteRequest
data.Jobs = make(map[string]*structs.JobDeregisterOptions, len(v.Jobs))
if len(v.Jobs) != 0 {
for k, v := range v.Jobs {
data.Jobs[k.Namespace+"."+k.ID] = v
}
}
return data
}
var logTypes = map[raft.LogType]string{
raft.LogCommand: "LogCommand",
raft.LogNoop: "LogNoop",
raft.LogAddPeerDeprecated: "LogAddPeerDeprecated",
raft.LogRemovePeerDeprecated: "LogRemovePeerDeprecated",
raft.LogBarrier: "LogBarrier",
raft.LogConfiguration: "LogConfiguration",
}