add io.Reader based xdb input supports

maker/golang/cmd/edit.go

@@ -116,7 +116,7 @@ func Edit(sCmd string) {
 			// quit directly
 			break
 		} else if cmd == "save" {
-			err = editor.Save()
+			err = editor.SaveToFile(srcFile)
 			if err != nil {
 				fmt.Printf("failed to save the changes: %s\n", err)
 				continue

maker/golang/xdb/editor.go

@@ -9,6 +9,7 @@ package xdb
 import (
 	"container/list"
 	"fmt"
+	"io"
 	"os"
 	"path/filepath"
 	"sort"
@@ -18,8 +19,7 @@ type Editor struct {
 	verison *Version
 
 	// source ip file
-	srcPath   string
-	srcHandle *os.File
+	srcHandle io.ReadCloser
 	toSave    bool
 
 	// segments list
@@ -41,17 +41,20 @@ func NewEditor(version *Version, srcFile string) (*Editor, error) {
 		return nil, err
 	}
 
+	return INewEditor(version, srcHandle)
+}
+
+func INewEditor(version *Version, srcReader io.ReadCloser) (*Editor, error) {
 	e := &Editor{
 		verison:   version,
-		srcPath:   srcPath,
-		srcHandle: srcHandle,
+		srcHandle: srcReader,
 		toSave:    false,
 		segments:  list.New(),
 		rgCache:   NewRegionCache(),
 	}
 
 	// load the segments
-	if err = e.loadSegments(); err != nil {
+	if err := e.loadSegments(); err != nil {
 		return nil, fmt.Errorf("failed to load segments: %s", err)
 	}
 
@@ -372,11 +375,6 @@ func (e *Editor) PutFile(src string, cb func(newSeg *Segment, oldList []*Segment
 	return oldRows, newRows, nil
 }
 
-// save the changes to the source file.
-func (e *Editor) Save() error {
-	return e.SaveToFile(e.srcPath)
-}
-
 func (e *Editor) SaveToFile(dstFile string) error {
 	// check the to-save flag
 	if !e.toSave {

maker/golang/xdb/maker.go

@@ -55,6 +55,7 @@ package xdb
 import (
 	"encoding/binary"
 	"fmt"
+	"io"
 	"log/slog"
 	"math"
 	"os"
@@ -72,11 +73,17 @@ const (
 	VectorIndexLength = VectorIndexRows * VectorIndexCols * VectorIndexSize
 )
 
+type WriteSeekCloser interface {
+	io.Writer
+	io.Seeker
+	io.Closer
+}
+
 type Maker struct {
 	version *Version
 
-	srcHandle *os.File
-	dstHandle *os.File
+	srcHandle io.ReadCloser
+	dstHandle WriteSeekCloser
 
 	// self-define field index
 	fields []int
@@ -107,11 +114,15 @@ func NewMaker(version *Version, policy IndexPolicy, srcFile string, dstFile stri
 		return nil, fmt.Errorf("open target file `%s`: %w", dstFile, err)
 	}
 
+	return INewMaker(version, policy, srcHandle, dstHandle, fields), nil
+}
+
+func INewMaker(version *Version, policy IndexPolicy, srcReader io.ReadCloser, dstWriter WriteSeekCloser, fields []int) *Maker {
 	return &Maker{
 		version: version,
 
-		srcHandle: srcHandle,
-		dstHandle: dstHandle,
+		srcHandle: srcReader,
+		dstHandle: dstWriter,
 
 		// fields filter index
 		fields: fields,
@@ -121,7 +132,7 @@ func NewMaker(version *Version, policy IndexPolicy, srcFile string, dstFile stri
 		regionPool:  map[string]uint32{},
 		regionCache: NewRegionCache(),
 		vectorIndex: make([]byte, VectorIndexLength),
-	}, nil
+	}
 }
 
 func (m *Maker) initDbHeader() error {

maker/golang/xdb/processor.go

@@ -8,6 +8,7 @@ package xdb
 
 import (
 	"fmt"
+	"io"
 	"log/slog"
 	"os"
 	"sort"
@@ -16,8 +17,8 @@ import (
 )
 
 type Processor struct {
-	srcHandle *os.File
-	dstHandle *os.File
+	srcReader io.ReadCloser
+	dstWriter io.WriteCloser
 
 	// value clear
 	clearBasedIndex  int
@@ -45,9 +46,17 @@ func NewProcessor(srcFile string, dstFile string, fields []int,
 		return nil, fmt.Errorf("open target file `%s`: %w", dstFile, err)
 	}
 
+	return INewProcessor(
+		srcHandle, dstHandle, fields,
+		clearBasedIndex, clearValueEqual, clearValueExcept,
+	), nil
+}
+
+func INewProcessor(srcReader io.ReadCloser, dstWriter io.WriteCloser, fields []int,
+	clearBasedIndex int, clearValueEqual string, clearValueExcept string) *Processor {
 	return &Processor{
-		srcHandle: srcHandle,
-		dstHandle: dstHandle,
+		srcReader: srcReader,
+		dstWriter: dstWriter,
 
 		// clear
 		clearBasedIndex:  clearBasedIndex,
@@ -59,14 +68,14 @@ func NewProcessor(srcFile string, dstFile string, fields []int,
 
 		segments: []*Segment{},
 		rgCache:  NewRegionCache(),
-	}, nil
+	}
 }
 
 func (p *Processor) loadSegments() error {
 	slog.Info("try to load the segments ... ")
 	var tStart = time.Now()
 
-	_, mergeCount, iErr := IterateSegments(p.srcHandle, true, func(l string) {
+	_, mergeCount, iErr := IterateSegments(p.srcReader, true, func(l string) {
 		slog.Debug("loaded", "segment", l)
 	}, func(region string) (string, error) {
 		if p.clearBasedIndex > -1 {
@@ -135,7 +144,7 @@ func (p *Processor) Start() error {
 
 	slog.Info("try to write all segments to target file ...")
 	for _, seg := range p.segments {
-		_, err := fmt.Fprintln(p.dstHandle, seg.String())
+		_, err := fmt.Fprintln(p.dstWriter, seg.String())
 		if err != nil {
 			return fmt.Errorf("write segment index for '%s': %w", seg.String(), err)
 		}
@@ -146,12 +155,12 @@ func (p *Processor) Start() error {
 }
 
 func (p *Processor) End() error {
-	err := p.dstHandle.Close()
+	err := p.dstWriter.Close()
 	if err != nil {
 		return err
 	}
 
-	err = p.srcHandle.Close()
+	err = p.srcReader.Close()
 	if err != nil {
 		return err
 	}

maker/golang/xdb/searcher.go

@@ -13,13 +13,14 @@ package xdb
 import (
 	"encoding/binary"
 	"fmt"
+	"io"
 	"os"
 )
 
 type Searcher struct {
 	version *Version
 
-	handle *os.File
+	handle io.ReadSeekCloser
 
 	// header info
 	header []byte
@@ -36,14 +37,16 @@ func NewSearcher(version *Version, dbFile string) (*Searcher, error) {
 		return nil, err
 	}
 
+	return INewSearcher(version, handle), nil
+}
+
+func INewSearcher(version *Version, handle io.ReadSeekCloser) *Searcher {
 	return &Searcher{
-		version: version,
-
-		handle: handle,
-		header: nil,
-
+		version:     version,
+		handle:      handle,
+		header:      nil,
 		vectorIndex: nil,
-	}, nil
+	}
 }
 
 func (s *Searcher) Close() {

maker/golang/xdb/util.go

@@ -8,10 +8,10 @@ import (
 	"bufio"
 	"bytes"
 	"fmt"
+	"io"
 	"math/big"
 	"net"
 	"net/netip"
-	"os"
 	"strings"
 )
 
@@ -180,10 +180,10 @@ func IPMiddle(sip, eip []byte) ([]byte, error) {
 	return IPHalf(buf), nil
 }
 
-func IterateSegments(handle *os.File, autoMerge bool, before func(l string), filter func(region string) (string, error), cRegion func(string) *Region, done func(seg *Segment) error) (int, int, error) {
+func IterateSegments(reader io.Reader, autoMerge bool, before func(l string), filter func(region string) (string, error), cRegion func(string) *Region, done func(seg *Segment) error) (int, int, error) {
 	var last *Segment = nil
 	var totalCount, mergeCount = 0, 0
-	var scanner = bufio.NewScanner(handle)
+	var scanner = bufio.NewScanner(reader)
 	scanner.Split(bufio.ScanLines)
 	for scanner.Scan() {
 		var l = strings.TrimSpace(strings.TrimSuffix(scanner.Text(), "\n"))