support build key

Signed-off-by: qupeng <qupeng@pingcap.com>

.gitignore

@@ -4,6 +4,7 @@
 *.dll
 *.so
 *.dylib
+mok
 
 # Test binary, build with `go test -c`
 *.test

README.md

@@ -27,6 +27,8 @@ You can also manually build it by yourself:
 ```
 
 ## Usage
+
+Parse a given key:
 ```
 $ mok 7A7480000000000007FF8F5F728000000000FF083BBA0000000000FAFA6C400A6673FFFE
 "7A7480000000000007FF8F5F728000000000FF083BBA0000000000FAFA6C400A6673FFFE"
@@ -44,7 +46,19 @@ $ mok 7A7480000000000007FF8F5F728000000000FF083BBA0000000000FAFA6C400A6673FFFE
   └─"\354\016\370\363M4\323M4\323M4\323\261E\360^E\357o4\323M4\323M4\024]<\334\020@\323M4\323M4\323A@\024\016\202\343M\000\353\256\367\024QD"
 ```
 
+Build a key for a given record:
+```
+$ ./mok --table-id 43 --row-value 81934
+built key: 7480000000000000FF2B5F728000000000FF01400E0000000000FA
+```
+
+Build a key for a given index:
+```
+$ ./mok --table-id 43 --index-id 50 --index-value 81934
+built key: 7480000000000000FF2B5F698000000000FF0000328000000000FF01400E0000000000FA
+```
+
 ## TODO
 
-- [ ] build keys
+- [x] build keys
 - [ ] decode tidb meta keys

go.mod

@@ -5,6 +5,7 @@ go 1.12
 require (
 	github.com/cznic/mathutil v0.0.0-20181122101859-297441e03548 // indirect
 	github.com/juju/errors v0.0.0-20190207033735-e65537c515d7 // indirect
+	github.com/pingcap/check v0.0.0-20191107115940-caf2b9e6ccf4 // indirect
 	github.com/pingcap/tidb v2.0.11+incompatible
 	github.com/remyoudompheng/bigfft v0.0.0-20190512091148-babf20351dd7 // indirect
 	github.com/sirupsen/logrus v1.4.2 // indirect

go.sum

@@ -1,25 +1,75 @@
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main.go

@@ -1,21 +1,60 @@
 package main
 
 import (
+	"encoding/hex"
 	"flag"
 	"fmt"
 	"os"
+	"strconv"
+	"strings"
+
+	"github.com/pingcap/tidb/util/codec"
 )
 
 var keyFormat = flag.String("format", "proto", "output format (go/hex/base64/proto)")
+var tableID = flag.Int64("table-id", 0, "table ID")
+var indexID = flag.Int64("index-id", 0, "index ID")
+var rowValue = flag.String("row-value", "", "row value")
+var indexValue = flag.String("index-value", "", "index value")
 
 func main() {
 	flag.Parse()
 
-	if flag.NArg() != 1 {
-		fmt.Println("usage:\nmok {flags} {key}")
+	if flag.NArg() == 1 { // Decode the given key.
+		n := N("key", []byte(flag.Arg(0)))
+		n.Expand().Print()
+	} else if flag.NArg() == 0 { // Build a key with given flags.
+		key := []byte{'t'}
+		key = codec.EncodeInt(key, *tableID)
+		if *tableID == 0 {
+			fmt.Println("table ID shouldn't be 0")
+			os.Exit(1)
+		}
+
+		if *indexID == 0 {
+			key = append(key, []byte("_r")...)
+			rowValueInt, err := strconv.ParseInt(*rowValue, 10, 64)
+			if err != nil {
+				fmt.Printf("invalid row value: %s\n", *rowValue)
+				os.Exit(1)
+			}
+			key = codec.EncodeInt(key, rowValueInt)
+		} else {
+			key = append(key, []byte("_i")...)
+			key = codec.EncodeInt(key, *indexID)
+			indexValueInt, err := strconv.ParseInt(*indexValue, 10, 64)
+			if err != nil {
+				fmt.Printf("invalid index value: %s\n", *indexValue)
+				os.Exit(1)
+			}
+			key = codec.EncodeInt(key, indexValueInt)
+		}
+
+		key = codec.EncodeBytes([]byte{}, key)
+		fmt.Printf("built key: %s\n", strings.ToUpper(hex.EncodeToString(key)))
+	} else {
+		fmt.Println("usage:\nmok {flags} [key]")
 		flag.PrintDefaults()
 		os.Exit(1)
 	}
-
-	N("key", []byte(flag.Arg(0))).Expand().Print()
 }