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plugin_register_generate.go
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plugin_register_generate.go
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//go:build ignore
// +build ignore
/**
* Tencent is pleased to support the open source community by making polaris-go available.
*
* Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
*
* Licensed under the BSD 3-Clause License (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://opensource.org/licenses/BSD-3-Clause
*
* Unless required by applicable law or agreed to in writing, software distributed
* under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
* CONDITIONS OF ANY KIND, either express or implied. See the License for the
* specific language governing permissions and limitations under the License.
*/
package main
import (
"bufio"
"go/format"
"io/ioutil"
"log"
"os"
"strings"
)
func main() {
mi := make(map[string]string, 0)
md := []string{}
file, err := os.Open(pluginFile)
if err != nil {
log.Fatalf("Failed to open %s: %q", pluginFile, err)
}
defer file.Close()
scanner := bufio.NewScanner(file)
for scanner.Scan() {
line := scanner.Text()
if strings.HasPrefix(line, "#") {
continue
}
items := strings.Split(line, ":")
if len(items) != 2 {
// ignore empty lines
continue
}
name, repo := strings.TrimSpace(items[0]), strings.TrimSpace(items[1])
if _, ok := mi[name]; ok {
log.Fatalf("Duplicate entry %q", name)
}
md = append(md, name)
mi[name] = pluginPath + repo // Default, unless overridden by 3rd arg
if _, err := os.Stat(pluginFSPath + repo); err != nil { // External package has been given
mi[name] = repo
}
}
genImports("pkg/plugin/register/plugins.go", "register", mi)
}
func genImports(file, pack string, mi map[string]string) {
openComment, err := ioutil.ReadFile(fileTemplate)
if err != nil {
log.Fatalf("Failed to read template file, %s\n", fileTemplate)
}
outs := string(openComment) + header + "package " + pack + "\n\n" + "import ("
if len(mi) > 0 {
outs += "\n"
}
outs += "// Include all plugins.\n"
for _, v := range mi {
outs += `_ "` + v + `"` + "\n"
}
outs += ")\n"
if err := formatAndWrite(file, outs); err != nil {
log.Fatalf("Failed to format and write: %q", err)
}
}
func formatAndWrite(file string, data string) error {
res, err := format.Source([]byte(data))
if err != nil {
return err
}
if err = ioutil.WriteFile(file, res, 0644); err != nil {
return err
}
return nil
}
const (
pluginPath = "github.com/polarismesh/polaris-go/plugin/"
pluginFile = "plugin.cfg"
fileTemplate = "pkg/plugin/register/plugins.temp"
pluginFSPath = "plugin/" // Where the plugins are located on the file system
header = "// generated by plugin_register_generate.go; DO NOT EDIT\n\n"
)