traefik/internal/gendoc.go

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package main
import (
"fmt"
"io"
"os"
"path"
"sort"
"strconv"
"strings"
"github.com/BurntSushi/toml"
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"github.com/containous/traefik/v2/pkg/config/env"
"github.com/containous/traefik/v2/pkg/config/flag"
"github.com/containous/traefik/v2/pkg/config/generator"
"github.com/containous/traefik/v2/pkg/config/parser"
"github.com/containous/traefik/v2/pkg/config/static"
"github.com/containous/traefik/v2/pkg/log"
)
func main() {
genStaticConfDoc("./docs/content/reference/static-configuration/env-ref.md", "", env.Encode)
genStaticConfDoc("./docs/content/reference/static-configuration/cli-ref.md", "--", flag.Encode)
genKVDynConfDoc("./docs/content/reference/dynamic-configuration/kv-ref.md")
}
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func genStaticConfDoc(outputFile, prefix string, encodeFn func(interface{}) ([]parser.Flat, error)) {
logger := log.WithoutContext().WithField("file", outputFile)
element := &static.Configuration{}
generator.Generate(element)
flats, err := encodeFn(element)
if err != nil {
logger.Fatal(err)
}
err = os.RemoveAll(outputFile)
if err != nil {
logger.Fatal(err)
}
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file, err := os.OpenFile(outputFile, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0o666)
if err != nil {
logger.Fatal(err)
}
defer file.Close()
w := errWriter{w: file}
w.writeln(`<!--
CODE GENERATED AUTOMATICALLY
THIS FILE MUST NOT BE EDITED BY HAND
-->`)
w.writeln()
for i, flat := range flats {
w.writeln("`" + prefix + strings.ReplaceAll(flat.Name, "[0]", "[n]") + "`: ")
if flat.Default == "" {
w.writeln(flat.Description)
} else {
w.writeln(flat.Description + " (Default: ```" + flat.Default + "```)")
}
if i < len(flats)-1 {
w.writeln()
}
}
if w.err != nil {
logger.Fatal(err)
}
}
type errWriter struct {
w io.Writer
err error
}
func (ew *errWriter) writeln(a ...interface{}) {
if ew.err != nil {
return
}
_, ew.err = fmt.Fprintln(ew.w, a...)
}
func genKVDynConfDoc(outputFile string) {
dynConfPath := "./docs/content/reference/dynamic-configuration/file.toml"
conf := map[string]interface{}{}
_, err := toml.DecodeFile(dynConfPath, &conf)
if err != nil {
log.Fatal(err)
}
file, err := os.Create(outputFile)
if err != nil {
log.Fatal(err)
}
store := storeWriter{data: map[string]string{}}
c := client{store: store}
err = c.load("traefik", conf)
if err != nil {
log.Fatal(err)
}
var keys []string
for k := range store.data {
keys = append(keys, k)
}
sort.Strings(keys)
for _, k := range keys {
_, _ = fmt.Fprintf(file, "| `%s` | `%s` |\n", k, store.data[k])
}
}
type storeWriter struct {
data map[string]string
}
func (f storeWriter) Put(key string, value []byte, options []string) error {
f.data[key] = string(value)
return nil
}
type client struct {
store storeWriter
}
func (c client) load(parentKey string, conf map[string]interface{}) error {
for k, v := range conf {
switch entry := v.(type) {
case map[string]interface{}:
key := path.Join(parentKey, k)
if len(entry) == 0 {
err := c.store.Put(key, nil, nil)
if err != nil {
return err
}
} else {
err := c.load(key, entry)
if err != nil {
return err
}
}
case []map[string]interface{}:
for i, o := range entry {
key := path.Join(parentKey, k, strconv.Itoa(i))
if err := c.load(key, o); err != nil {
return err
}
}
case []interface{}:
for i, o := range entry {
key := path.Join(parentKey, k, strconv.Itoa(i))
err := c.store.Put(key, []byte(fmt.Sprintf("%v", o)), nil)
if err != nil {
return err
}
}
default:
key := path.Join(parentKey, k)
err := c.store.Put(key, []byte(fmt.Sprintf("%v", v)), nil)
if err != nil {
return err
}
}
}
return nil
}