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d8714e64e4
* Rename middleware to plugin first pass; mostly used 'sed', few spots where I manually changed text. This still builds a coredns binary. * fmt error * Rename AddMiddleware to AddPlugin * Readd AddMiddleware to remain backwards compat
121 lines
2.4 KiB
Go
121 lines
2.4 KiB
Go
//+build ignore
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package main
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import (
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"bufio"
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"go/format"
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"io/ioutil"
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"log"
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"os"
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"sort"
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"strconv"
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"strings"
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)
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func main() {
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mi := make(map[string]string, 0)
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md := make(map[int]string, 0)
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file, err := os.Open(pluginFile)
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fatalIfErr(err)
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defer file.Close()
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scanner := bufio.NewScanner(file)
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for scanner.Scan() {
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line := scanner.Text()
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if strings.HasPrefix(line, "#") {
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continue
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}
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items := strings.Split(line, ":")
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if len(items) != 3 {
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// ignore
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continue
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}
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priority, err := strconv.Atoi(items[0])
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fatalIfErr(err)
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if v, ok := md[priority]; ok {
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log.Fatalf("Duplicate priority '%d', slot already taken by %q", priority, v)
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}
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md[priority] = items[1]
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mi[items[1]] = pluginPath + items[2] // Default, unless overridden by 3rd arg
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if _, err := os.Stat(pluginFSPath + items[2]); err != nil { // External package has been given
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mi[items[1]] = items[2]
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}
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}
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genImports("core/zplugin.go", "core", mi)
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genDirectives("core/dnsserver/zdirectives.go", "dnsserver", md)
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}
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func genImports(file, pack string, mi map[string]string) {
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outs := header + "package " + pack + "\n\n" + "import ("
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if len(mi) > 0 {
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outs += "\n"
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}
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outs += "// Include all plugin.\n"
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for _, v := range mi {
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outs += `_ "` + v + `"` + "\n"
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}
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outs += ")\n"
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res, err := format.Source([]byte(outs))
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fatalIfErr(err)
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err = ioutil.WriteFile(file, res, 0644)
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fatalIfErr(err)
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}
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func genDirectives(file, pack string, md map[int]string) {
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outs := header + "package " + pack + "\n\n"
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outs += `
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// Directives are registered in the order they should be
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// executed.
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//
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// Ordering is VERY important. Every plugin will
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// feel the effects of all other plugin below
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// (after) them during a request, but they must not
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// care what plugin above them are doing.
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var directives = []string{
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`
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var orders []int
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for k := range md {
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orders = append(orders, k)
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}
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sort.Ints(orders)
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for _, k := range orders {
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outs += `"` + md[k] + `",` + "\n"
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}
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outs += "}\n"
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res, err := format.Source([]byte(outs))
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fatalIfErr(err)
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err = ioutil.WriteFile(file, res, 0644)
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fatalIfErr(err)
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}
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func fatalIfErr(err error) {
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if err != nil {
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log.Fatal(err)
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}
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}
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const (
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pluginPath = "github.com/coredns/coredns/plugin/"
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pluginFile = "plugin.cfg"
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pluginFSPath = "plugin/" // Where the plugins are located on the file system
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header = "// generated by directives_generate.go; DO NOT EDIT\n\n"
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)
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