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//+build ignore
package main
import (
"bufio"
"go/format"
"io/ioutil"
"log"
"os"
"sort"
"strconv"
"strings"
)
func main() {
mi := make(map[string]string, 0)
md := make(map[int]string, 0)
file, err := os.Open(pluginFile)
fatalIfErr(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) != 3 {
// ignore
continue
}
priority, err := strconv.Atoi(items[0])
fatalIfErr(err)
if v, ok := md[priority]; ok {
log.Fatalf("Duplicate priority '%d', slot already taken by %q", priority, v)
}
md[priority] = items[1]
mi[items[1]] = pluginPath + items[2] // Default, unless overridden by 3rd arg
if _, err := os.Stat(pluginFSPath + items[2]); err != nil { // External package has been given
mi[items[1]] = items[2]
}
}
genImports("core/zplugin.go", "core", mi)
genDirectives("core/dnsserver/zdirectives.go", "dnsserver", md)
}
func genImports(file, pack string, mi map[string]string) {
outs := 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"
res, err := format.Source([]byte(outs))
fatalIfErr(err)
err = ioutil.WriteFile(file, res, 0644)
fatalIfErr(err)
}
func genDirectives(file, pack string, md map[int]string) {
outs := header + "package " + pack + "\n\n"
outs += `
// Directives are registered in the order they should be
// executed.
//
// Ordering is VERY important. Every plugin will
// feel the effects of all other plugin below
// (after) them during a request, but they must not
// care what plugin above them are doing.
var directives = []string{
`
var orders []int
for k := range md {
orders = append(orders, k)
}
sort.Ints(orders)
for _, k := range orders {
outs += `"` + md[k] + `",` + "\n"
}
outs += "}\n"
res, err := format.Source([]byte(outs))
fatalIfErr(err)
err = ioutil.WriteFile(file, res, 0644)
fatalIfErr(err)
}
func fatalIfErr(err error) {
if err != nil {
log.Fatal(err)
}
}
const (
pluginPath = "github.com/coredns/coredns/plugin/"
pluginFile = "plugin.cfg"
pluginFSPath = "plugin/" // Where the plugins are located on the file system
header = "// generated by directives_generate.go; DO NOT EDIT\n\n"
)
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