traefik/internal/gendoc.go
2024-01-17 14:54:05 +01:00

399 lines
9.2 KiB
Go

package main
import (
"bytes"
"fmt"
"io"
"os"
"path"
"path/filepath"
"reflect"
"sort"
"strconv"
"strings"
"github.com/BurntSushi/toml"
"github.com/rs/zerolog/log"
"github.com/traefik/paerser/env"
"github.com/traefik/paerser/flag"
"github.com/traefik/paerser/generator"
"github.com/traefik/paerser/parser"
"github.com/traefik/traefik/v3/cmd"
"github.com/traefik/traefik/v3/pkg/collector/hydratation"
"github.com/traefik/traefik/v3/pkg/config/dynamic"
"github.com/traefik/traefik/v3/pkg/config/static"
"gopkg.in/yaml.v3"
)
var commentGenerated = `## CODE GENERATED AUTOMATICALLY
## THIS FILE MUST NOT BE EDITED BY HAND
`
func main() {
logger := log.With().Logger()
dynConf := &dynamic.Configuration{}
err := hydratation.Hydrate(dynConf)
if err != nil {
logger.Fatal().Err(err).Send()
}
dynConf.HTTP.Models = map[string]*dynamic.Model{}
clean(dynConf.HTTP.Middlewares)
clean(dynConf.TCP.Middlewares)
clean(dynConf.HTTP.Services)
clean(dynConf.TCP.Services)
clean(dynConf.UDP.Services)
err = tomlWrite("./docs/content/reference/dynamic-configuration/file.toml", dynConf)
if err != nil {
logger.Fatal().Err(err).Send()
}
err = yamlWrite("./docs/content/reference/dynamic-configuration/file.yaml", dynConf)
if err != nil {
logger.Fatal().Err(err).Send()
}
err = labelsWrite("./docs/content/reference/dynamic-configuration", dynConf)
if err != nil {
logger.Fatal().Err(err).Send()
}
staticConf := &static.Configuration{}
err = hydratation.Hydrate(staticConf)
if err != nil {
logger.Fatal().Err(err).Send()
}
delete(staticConf.EntryPoints, "EntryPoint1")
err = tomlWrite("./docs/content/reference/static-configuration/file.toml", staticConf)
if err != nil {
logger.Fatal().Err(err).Send()
}
err = yamlWrite("./docs/content/reference/static-configuration/file.yaml", staticConf)
if err != nil {
logger.Fatal().Err(err).Send()
}
genStaticConfDoc("./docs/content/reference/static-configuration/env-ref.md", "", func(i interface{}) ([]parser.Flat, error) {
return env.Encode(env.DefaultNamePrefix, i)
})
genStaticConfDoc("./docs/content/reference/static-configuration/cli-ref.md", "--", flag.Encode)
genKVDynConfDoc("./docs/content/reference/dynamic-configuration/kv-ref.md")
}
func labelsWrite(outputDir string, element *dynamic.Configuration) error {
cleanServers(element)
etnOpts := parser.EncoderToNodeOpts{OmitEmpty: true, TagName: parser.TagLabel, AllowSliceAsStruct: true}
node, err := parser.EncodeToNode(element, parser.DefaultRootName, etnOpts)
if err != nil {
return err
}
metaOpts := parser.MetadataOpts{TagName: parser.TagLabel, AllowSliceAsStruct: true}
err = parser.AddMetadata(element, node, metaOpts)
if err != nil {
return err
}
labels := make(map[string]string)
encodeNode(labels, node.Name, node)
var keys []string
for k := range labels {
keys = append(keys, k)
}
sort.Strings(keys)
dockerLabels, err := os.Create(filepath.Join(outputDir, "docker-labels.yml"))
if err != nil {
return err
}
defer dockerLabels.Close()
// Write the comment at the beginning of the file
if _, err := dockerLabels.WriteString(commentGenerated); err != nil {
return err
}
for _, k := range keys {
v := labels[k]
if v != "" {
if v == "42000000000" {
v = "42s"
}
fmt.Fprintln(dockerLabels, `- "`+strings.ToLower(k)+`=`+v+`"`)
}
}
return nil
}
func cleanServers(element *dynamic.Configuration) {
for _, svc := range element.HTTP.Services {
if svc.LoadBalancer != nil {
server := svc.LoadBalancer.Servers[0]
svc.LoadBalancer.Servers = nil
svc.LoadBalancer.Servers = append(svc.LoadBalancer.Servers, server)
}
}
for _, svc := range element.TCP.Services {
if svc.LoadBalancer != nil {
server := svc.LoadBalancer.Servers[0]
svc.LoadBalancer.Servers = nil
svc.LoadBalancer.Servers = append(svc.LoadBalancer.Servers, server)
}
}
for _, svc := range element.UDP.Services {
if svc.LoadBalancer != nil {
server := svc.LoadBalancer.Servers[0]
svc.LoadBalancer.Servers = nil
svc.LoadBalancer.Servers = append(svc.LoadBalancer.Servers, server)
}
}
}
func yamlWrite(outputFile string, element any) error {
file, err := os.OpenFile(outputFile, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0o666)
if err != nil {
return err
}
defer file.Close()
// Write the comment at the beginning of the file
if _, err := file.WriteString(commentGenerated); err != nil {
return err
}
buf := new(bytes.Buffer)
encoder := yaml.NewEncoder(buf)
encoder.SetIndent(2)
err = encoder.Encode(element)
if err != nil {
return err
}
_, err = file.Write(buf.Bytes())
return err
}
func tomlWrite(outputFile string, element any) error {
file, err := os.OpenFile(outputFile, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0o666)
if err != nil {
return err
}
defer file.Close()
// Write the comment at the beginning of the file
if _, err := file.WriteString(commentGenerated); err != nil {
return err
}
return toml.NewEncoder(file).Encode(element)
}
func clean(element any) {
valSvcs := reflect.ValueOf(element)
key := valSvcs.MapKeys()[0]
valueSvcRoot := valSvcs.MapIndex(key).Elem()
var svcFieldNames []string
for i := 0; i < valueSvcRoot.NumField(); i++ {
svcFieldNames = append(svcFieldNames, valueSvcRoot.Type().Field(i).Name)
}
sort.Strings(svcFieldNames)
for i, fieldName := range svcFieldNames {
v := reflect.New(valueSvcRoot.Type())
v.Elem().FieldByName(fieldName).Set(valueSvcRoot.FieldByName(fieldName))
valSvcs.SetMapIndex(reflect.ValueOf(fmt.Sprintf("%s%.2d", valueSvcRoot.Type().Name(), i+1)), v)
}
valSvcs.SetMapIndex(reflect.ValueOf(fmt.Sprintf("%s0", valueSvcRoot.Type().Name())), reflect.Value{})
valSvcs.SetMapIndex(reflect.ValueOf(fmt.Sprintf("%s1", valueSvcRoot.Type().Name())), reflect.Value{})
}
func genStaticConfDoc(outputFile, prefix string, encodeFn func(interface{}) ([]parser.Flat, error)) {
logger := log.With().Str("file", outputFile).Logger()
element := &cmd.NewTraefikConfiguration().Configuration
generator.Generate(element)
flats, err := encodeFn(element)
if err != nil {
logger.Fatal().Err(err).Send()
}
err = os.RemoveAll(outputFile)
if err != nil {
logger.Fatal().Err(err).Send()
}
file, err := os.OpenFile(outputFile, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0o666)
if err != nil {
logger.Fatal().Err(err).Send()
}
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 {
// TODO must be move into the flats creation.
if flat.Name == "experimental.plugins.<name>" || flat.Name == "TRAEFIK_EXPERIMENTAL_PLUGINS_<NAME>" {
continue
}
if strings.HasPrefix(flat.Name, "pilot.") || strings.HasPrefix(flat.Name, "TRAEFIK_PILOT_") {
continue
}
if prefix == "" {
w.writeln("`" + prefix + strings.ReplaceAll(flat.Name, "[0]", "_n") + "`: ")
} else {
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(err).Send()
}
}
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(err).Send()
}
file, err := os.Create(outputFile)
if err != nil {
log.Fatal().Err(err).Send()
}
store := storeWriter{data: map[string]string{}}
c := client{store: store}
err = c.load("traefik", conf)
if err != nil {
log.Fatal().Err(err).Send()
}
var keys []string
for k := range store.data {
keys = append(keys, k)
}
sort.Strings(keys)
_, _ = fmt.Fprintf(file, `<!--
CODE GENERATED AUTOMATICALLY
THIS FILE MUST NOT BE EDITED BY HAND
-->
`)
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, _ []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
}