cmd: add plugin package tool (#9007)

Author: lysu

cmd/pluginpkg/pluginpkg.go

@@ -0,0 +1,154 @@
+// Copyright 2018 PingCAP, 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,
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"context"
+	"encoding/json"
+	"flag"
+	"fmt"
+	"log"
+	"os"
+	"os/exec"
+	"path"
+	"path/filepath"
+	"text/template"
+	"time"
+
+	"github.com/BurntSushi/toml"
+)
+
+var (
+	pkgDir string
+	outDir string
+)
+
+const codeTemplate = `
+package main
+
+import (
+	"github.com/pingcap/tidb/plugin"
+	"github.com/pingcap/tidb/sessionctx/variable"
+)
+
+func PluginManifest() *plugin.Manifest {
+	return plugin.ExportManifest(&plugin.{{.kind}}Manifest{
+		Manifest: plugin.Manifest{
+			Kind:           plugin.{{.kind}},
+			Name:           "{{.name}}",
+			Description:    "{{.description}}",
+			Version:        {{.version}},
+			RequireVersion: map[string]uint16{},
+			License:        "{{.license}}",
+			BuildTime:      "{{.buildTime}}",
+			SysVars: map[string]*variable.SysVar{
+			    {{range .sysVars}}
+				"{{.name}}": {
+					Scope: variable.Scope{{.scope}},
+					Name:  "{{.name}}",
+					Value: "{{.value}}",
+				},
+				{{end}}
+			},
+			Validate:   {{.validate}},
+			OnInit:     {{.onInit}},
+			OnShutdown: {{.onShutdown}},
+		},
+		{{range .export}}
+		{{.extPoint}}: {{.impl}},
+		{{end}}
+	})
+}
+`
+
+func init() {
+	flag.StringVar(&pkgDir, "pkg-dir", "", "plugin package folder path")
+	flag.StringVar(&outDir, "out-dir", "", "plugin packaged folder path")
+	flag.Usage = usage
+}
+
+func usage() {
+	log.Printf("Usage: %s --pkg-dir [plugin source pkg folder] --outDir-dir [outDir-dir]\n", path.Base(os.Args[0]))
+	flag.PrintDefaults()
+	os.Exit(1)
+}
+
+func main() {
+	flag.Parse()
+	if pkgDir == "" || outDir == "" {
+		flag.Usage()
+	}
+	var manifest map[string]interface{}
+	_, err := toml.DecodeFile(filepath.Join(pkgDir, "manifest.toml"), &manifest)
+	if err != nil {
+		log.Printf("read pkg %s's manifest failure, %+v\n", pkgDir, err)
+		os.Exit(1)
+	}
+	manifest["buildTime"] = time.Now().String()
+
+	pluginName := manifest["name"].(string)
+	if pluginName != filepath.Base(pkgDir) {
+		log.Printf("plugin package must be same with plugin name in manifest file\n")
+		os.Exit(1)
+	}
+
+	version := manifest["version"].(string)
+	tmpl, err := template.New("gen-plugin").Parse(codeTemplate)
+	if err != nil {
+		log.Printf("generate code failure during parse template, %+v\n", err)
+		os.Exit(1)
+	}
+
+	genFileName := filepath.Join(pkgDir, filepath.Base(pkgDir)+".gen.go")
+	genFile, err := os.OpenFile(genFileName, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0755)
+	if err != nil {
+		log.Printf("generate code failure during prepare output file, %+v\n", err)
+		os.Exit(1)
+	}
+	defer func() {
+		err1 := os.Remove(genFileName)
+		if err1 != nil {
+			log.Printf("remove tmp file %s failure, please clean up manually at %v", genFileName, err1)
+		}
+	}()
+
+	err = tmpl.Execute(genFile, manifest)
+	if err != nil {
+		log.Printf("generate code failure during generating code, %+v\n", err)
+		os.Exit(1)
+	}
+
+	outputFile := filepath.Join(outDir, pluginName+"-"+version+".so")
+	pluginPath := `-pluginpath=` + pluginName + "-" + version
+	ctx := context.Background()
+	buildCmd := exec.CommandContext(ctx, "go", "build",
+		"-ldflags", pluginPath,
+		"-buildmode=plugin",
+		"-o", outputFile, pkgDir)
+	buildCmd.Stderr = os.Stderr
+	buildCmd.Stdout = os.Stdout
+	buildCmd.Env = append(os.Environ(), "GO111MODULE=on")
+	err = buildCmd.Run()
+	if err != nil {
+		log.Printf("compile plugin source code failure, %+v\n", err)
+		os.Exit(1)
+	}
+	fmt.Printf(`Package "%s" as plugin "%s" success.`+"\nManifest:\n", pkgDir, outputFile)
+	encoder := json.NewEncoder(os.Stdout)
+	encoder.SetIndent(" ", "\t")
+	err = encoder.Encode(manifest)
+	if err != nil {
+		log.Printf("print manifest detail failure, err: %v", err)
+	}
+}