support gracefully shutdown

cmd/redis-shake/main.go

@@ -1,6 +1,10 @@
 package main
 
 import (
+	"os"
+	"os/signal"
+	"syscall"
+	"context"
 	_ "net/http/pprof"
 
 	"RedisShake/internal/config"
@@ -110,7 +114,10 @@ func main() {
 
 	log.Infof("start syncing...")
 
-	ch := theReader.StartRead()
+	ctx, cancel := context.WithCancel(context.Background())
+	ch := theReader.StartRead(ctx)
+	go waitShutdown(cancel)
+
 	for e := range ch {
 		// calc arguments
 		e.Parse()
@@ -132,3 +139,11 @@ func main() {
 	utils.ReleaseFileLock() // Release file lock
 	log.Infof("all done")
 }
+
+func waitShutdown(cancel context.CancelFunc) {
+	quitCh := make(chan os.Signal, 1)
+	signal.Notify(quitCh, syscall.SIGINT, syscall.SIGTERM, syscall.SIGQUIT)
+	sig := <-quitCh
+	log.Infof("Got signal: %s to exit.", sig)
+	cancel()
+}

internal/aof/aof.go

@@ -2,6 +2,7 @@ package aof
 
 import (
 	"bufio"
+	"context"
 	"io"
 	"os"
 	"strconv"
@@ -51,7 +52,7 @@ func ReadCompleteLine(reader *bufio.Reader) ([]byte, error) {
 	return line, err
 }
 
-func (ld *Loader) LoadSingleAppendOnlyFile(timestamp int64) int {
+func (ld *Loader) LoadSingleAppendOnlyFile(ctx context.Context, timestamp int64) int {
 	ret := OK
 	filePath := ld.filePath
 	fp, err := os.Open(filePath)
@@ -80,12 +81,14 @@ func (ld *Loader) LoadSingleAppendOnlyFile(timestamp int64) int {
 	}
 	reader := bufio.NewReader(fp)
 	for {
-
-		line, err := ReadCompleteLine(reader)
-		{
+		select {
+		case <-ctx.Done():
+			return ret
+		default:
+			line, err := ReadCompleteLine(reader)
 			if err != nil {
 				if err == io.EOF {
-					break
+					return ret
 				} else {
 					log.Infof("Unrecoverable error reading the append only File %v: %v", filePath, err)
 					ret = Failed
@@ -152,9 +155,6 @@ func (ld *Loader) LoadSingleAppendOnlyFile(timestamp int64) int {
 				e.Argv = append(e.Argv, value)
 			}
 			ld.ch <- e
-
 		}
-
 	}
-	return ret
 }

internal/client/redis.go

@@ -12,6 +12,7 @@ import (
 )
 
 type Redis struct {
+	conn        net.Conn
 	reader      *bufio.Reader
 	writer      *bufio.Writer
 	protoReader *proto.Reader
@@ -33,6 +34,7 @@ func NewRedisClient(address string, username string, password string, Tls bool)
 		log.Panicf("dial failed. address=[%s], tls=[%v], err=[%v]", address, Tls, err)
 	}
 
+	r.conn = conn
 	r.reader = bufio.NewReader(conn)
 	r.writer = bufio.NewWriter(conn)
 	r.protoReader = proto.NewReader(r.reader)
@@ -129,6 +131,12 @@ func (r *Redis) SetBufioReader(rd *bufio.Reader) {
 	r.protoReader = proto.NewReader(r.reader)
 }
 
+func (r *Redis) Close() {
+	if err := r.conn.Close(); err != nil {
+		log.Infof("close redis conn err: %s\n", err.Error())
+	}
+}
+
 /* Commands */
 
 func (r *Redis) Scan(cursor uint64) (newCursor uint64, keys []string) {

internal/rdb/rdb.go

@@ -3,6 +3,7 @@ package rdb
 import (
 	"bufio"
 	"bytes"
+	"context"
 	"encoding/binary"
 	"io"
 	"os"
@@ -60,7 +61,7 @@ func NewLoader(name string, updateFunc func(int64), filPath string, ch chan *ent
 
 // ParseRDB parse rdb file
 // return repl stream db id
-func (ld *Loader) ParseRDB() int {
+func (ld *Loader) ParseRDB(ctx context.Context) int {
 	var err error
 	ld.fp, err = os.OpenFile(ld.filPath, os.O_RDONLY, 0666)
 	if err != nil {
@@ -89,12 +90,12 @@ func (ld *Loader) ParseRDB() int {
 	log.Debugf("[%s] RDB version: %d", ld.name, version)
 
 	// read entries
-	ld.parseRDBEntry(rd)
+	ld.parseRDBEntry(ctx, rd)
 
 	return ld.replStreamDbId
 }
 
-func (ld *Loader) parseRDBEntry(rd *bufio.Reader) {
+func (ld *Loader) parseRDBEntry(ctx context.Context, rd *bufio.Reader) {
 	// for stat
 	updateProcessSize := func() {
 		if ld.updateFunc == nil {
@@ -198,6 +199,8 @@ func (ld *Loader) parseRDBEntry(rd *bufio.Reader) {
 		select {
 		case <-tick:
 			updateProcessSize()
+		case <- ctx.Done():
+			return
 		default:
 		}
 	}

internal/reader/aof_reader.go

@@ -1,10 +1,10 @@
 package reader
 
 import (
+	"context"
 	"path/filepath"
 
 	"RedisShake/internal/aof"
-
 	"RedisShake/internal/entry"
 	"RedisShake/internal/log"
 	"RedisShake/internal/utils"
@@ -66,7 +66,7 @@ func NewAOFReader(opts *AOFReaderOptions) Reader {
 	return r
 }
 
-func (r *aofReader) StartRead() chan *entry.Entry {
+func (r *aofReader) StartRead(ctx context.Context) chan *entry.Entry {
 	//init entry
 	r.ch = make(chan *entry.Entry, 1024)
 
@@ -79,7 +79,7 @@ func (r *aofReader) StartRead() chan *entry.Entry {
 		if manifestInfo == nil { // load single aof file
 			log.Infof("start send single AOF path=[%s]", r.path)
 			aofLoader := aof.NewLoader(r.path, r.ch)
-			ret := aofLoader.LoadSingleAppendOnlyFile(r.stat.AOFTimestamp)
+			ret := aofLoader.LoadSingleAppendOnlyFile(ctx, r.stat.AOFTimestamp)
 			if ret == AOFOk || ret == AOFTruncated {
 				log.Infof("The AOF File was successfully loaded")
 			} else {
@@ -89,7 +89,7 @@ func (r *aofReader) StartRead() chan *entry.Entry {
 			close(r.ch)
 		} else {
 			aofLoader := NewAOFFileInfo(r.path, r.ch)
-			ret := aofLoader.LoadAppendOnlyFile(manifestInfo, r.stat.AOFTimestamp)
+			ret := aofLoader.LoadAppendOnlyFile(ctx, manifestInfo, r.stat.AOFTimestamp)
 			if ret == AOFOk || ret == AOFTruncated {
 				log.Infof("The AOF File was successfully loaded")
 			} else {

internal/reader/interface.go

@@ -3,9 +3,10 @@ package reader
 import (
 	"RedisShake/internal/entry"
 	"RedisShake/internal/status"
+	"context"
 )
 
 type Reader interface {
 	status.Statusable
-	StartRead() chan *entry.Entry
-}
+	StartRead(ctx context.Context) chan *entry.Entry
+}

internal/reader/parsing_aof.go

@@ -4,6 +4,7 @@ import (
 	"bufio"
 	"bytes"
 	"container/list"
+	"context"
 	"fmt"
 	"io"
 	"os"
@@ -555,7 +556,7 @@ func GetHistoryAndIncrAppendOnlyFilesNum(am *AOFManifest) int {
 	return num
 }
 
-func (aofInfo *INFO) LoadAppendOnlyFile(am *AOFManifest, AOFTimeStamp int64) int {
+func (aofInfo *INFO) LoadAppendOnlyFile(ctx context.Context, am *AOFManifest, AOFTimeStamp int64) int {
 	if am == nil {
 		log.Panicf("AOFManifest is null")
 	}
@@ -593,7 +594,7 @@ func (aofInfo *INFO) LoadAppendOnlyFile(am *AOFManifest, AOFTimeStamp int64) int
 			aofInfo.UpdateLoadingFileName(AOFName)
 			BaseSize = aofInfo.GetAppendOnlyFileSize(AOFName, nil)
 			start = Ustime()
-			ret = aofInfo.ParsingSingleAppendOnlyFile(AOFName, 0) //Currently, RDB files cannot be restored at a point in time.
+			ret = aofInfo.ParsingSingleAppendOnlyFile(ctx, AOFName, 0) //Currently, RDB files cannot be restored at a point in time.
 			if ret == AOFOk || (ret == AOFTruncated) {
 				log.Infof("DB loaded from Base File %v: %.3f seconds", AOFName, float64(Ustime()-start)/1000000)
 			}
@@ -627,7 +628,7 @@ func (aofInfo *INFO) LoadAppendOnlyFile(am *AOFManifest, AOFTimeStamp int64) int
 				aofInfo.UpdateLoadingFileName(AOFName)
 				AOFNum++
 				start = Ustime()
-				ret = aofInfo.ParsingSingleAppendOnlyFile(AOFName, AOFTimeStamp)
+				ret = aofInfo.ParsingSingleAppendOnlyFile(ctx, AOFName, AOFTimeStamp)
 				if ret == AOFOk || (ret == AOFTruncated) {
 					log.Infof("DB loaded from History File %v: %.3f seconds", AOFName, float64(Ustime()-start)/1000000)
 					return ret
@@ -659,7 +660,7 @@ func (aofInfo *INFO) LoadAppendOnlyFile(am *AOFManifest, AOFTimeStamp int64) int
 			aofInfo.UpdateLoadingFileName(AOFName)
 			AOFNum++
 			start = Ustime()
-			ret = aofInfo.ParsingSingleAppendOnlyFile(AOFName, AOFTimeStamp)
+			ret = aofInfo.ParsingSingleAppendOnlyFile(ctx, AOFName, AOFTimeStamp)
 			if ret == AOFOk || (ret == AOFTruncated) {
 				log.Infof("DB loaded from incr File %v: %.3f seconds", AOFName, float64(Ustime()-start)/1000000)
 				return ret
@@ -691,7 +692,7 @@ func (aofInfo *INFO) LoadAppendOnlyFile(am *AOFManifest, AOFTimeStamp int64) int
 
 }
 
-func (aofInfo *INFO) ParsingSingleAppendOnlyFile(FileName string, AOFTimeStamp int64) int {
+func (aofInfo *INFO) ParsingSingleAppendOnlyFile(ctx context.Context, FileName string, AOFTimeStamp int64) int {
 	ret := AOFOk
 	AOFFilepath := path.Join(aofInfo.AOFDirName, FileName)
 	println(AOFFilepath)
@@ -725,12 +726,12 @@ func (aofInfo *INFO) ParsingSingleAppendOnlyFile(FileName string, AOFTimeStamp i
 		log.Infof("Reading RDB Base File on AOF loading...")
 		rdbOpt := RdbReaderOptions{Filepath: AOFFilepath}
 		ldRDB := NewRDBReader(&rdbOpt)
-		ldRDB.StartRead()
+		ldRDB.StartRead(ctx)
 		return AOFOk
 	}
 	// load single aof file
 	aofSingleReader := aof.NewLoader(MakePath(aofInfo.AOFDirName, FileName), aofInfo.ch)
-	ret = aofSingleReader.LoadSingleAppendOnlyFile(AOFTimeStamp)
+	ret = aofSingleReader.LoadSingleAppendOnlyFile(ctx, AOFTimeStamp)
 	return ret
 
 }

internal/reader/rdb_reader.go

@@ -1,13 +1,13 @@
 package reader
 
 import (
+	"context"
 	"fmt"
 
 	"RedisShake/internal/entry"
 	"RedisShake/internal/log"
 	"RedisShake/internal/rdb"
 	"RedisShake/internal/utils"
-
 	"github.com/dustin/go-humanize"
 )
 
@@ -41,7 +41,7 @@ func NewRDBReader(opts *RdbReaderOptions) Reader {
 	return r
 }
 
-func (r *rdbReader) StartRead() chan *entry.Entry {
+func (r *rdbReader) StartRead(ctx context.Context) chan *entry.Entry {
 	log.Infof("[%s] start read", r.stat.Name)
 	r.ch = make(chan *entry.Entry, 1024)
 	updateFunc := func(offset int64) {
@@ -53,7 +53,7 @@ func (r *rdbReader) StartRead() chan *entry.Entry {
 	rdbLoader := rdb.NewLoader(r.stat.Name, updateFunc, r.stat.Filepath, r.ch)
 
 	go func() {
-		_ = rdbLoader.ParseRDB()
+		_ = rdbLoader.ParseRDB(ctx)
 		log.Infof("[%s] rdb file parse done", r.stat.Name)
 		close(r.ch)
 	}()

internal/reader/scan_cluster_reader.go

@@ -1,6 +1,7 @@
 package reader
 
 import (
+	"context"
 	"fmt"
 	"sync"
 
@@ -25,13 +26,13 @@ func NewScanClusterReader(opts *ScanReaderOptions) Reader {
 	return rd
 }
 
-func (rd *scanClusterReader) StartRead() chan *entry.Entry {
+func (rd *scanClusterReader) StartRead(ctx context.Context) chan *entry.Entry {
 	ch := make(chan *entry.Entry, 1024)
 	var wg sync.WaitGroup
 	for _, r := range rd.readers {
 		wg.Add(1)
 		go func(r Reader) {
-			for e := range r.StartRead() {
+			for e := range r.StartRead(ctx) {
 				ch <- e
 			}
 			wg.Done()