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traefik.go
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traefik.go
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package processor
import (
"bytes"
"fmt"
"io"
"os"
"path/filepath"
"text/template"
"time"
"github.com/acheraime/gozouti/backend"
"github.com/acheraime/gozouti/configurator/traefik"
"github.com/acheraime/gozouti/utils"
)
type TraefikRedirect struct {
resources RedirectResources
buffer bytes.Buffer
parseURL bool
baseHost string
backend backend.Backend
namespace string
outDir string
alias string
}
type TRedirectConfig struct {
Alias string
Namespace string
OutputDir string
BaseHost string
RewriteHost bool
}
func NewTraefikRedirect(cfg TRedirectConfig, input [][]string, b backend.Backend) (Processor, error) {
if b.GetType() != backend.Backendkubernetes {
return nil, fmt.Errorf("traefik configuration requires a kubernetes backend type")
}
if cfg.Namespace == "" {
cfg.Namespace = "default"
}
tr := TraefikRedirect{
backend: b,
namespace: cfg.Namespace,
outDir: cfg.OutputDir,
baseHost: cfg.BaseHost,
alias: cfg.Alias,
}
var parseURL = true
if cfg.RewriteHost {
parseURL = false
}
resources, err := NewRedirectResources(input, parseURL, cfg.Alias, cfg.BaseHost, cfg.RewriteHost)
if err != nil {
return nil, err
}
tr.resources = resources
return tr, nil
}
func (t TraefikRedirect) build(o io.Writer) error {
if t.resources.Resources == nil {
return fmt.Errorf("nothing to generate: %v", t.resources.Resources)
}
// reset the buffer
t.buffer.Reset()
fileHeader += fmt.Sprintf("#### Timestamp: %s\n", time.Now().Format(time.RFC1123))
t.buffer.Write([]byte(fileHeader + "\n\n"))
middlewares := []traefik.Middleware{}
regexTemplate, err := template.New("regex").Parse(`^https://(.*).({{ .URLHost }}){{ .Regex }}?$$`)
if err != nil {
return err
}
replTemplate, err := template.New("replacement").Parse(`https://${1}.${2}{{ .Replacement }}`)
if err != nil {
return err
}
for _, r := range t.resources.Resources {
var regexStr bytes.Buffer
if err := regexTemplate.Execute(®exStr, r); err != nil {
return err
}
var replStr bytes.Buffer
if err := replTemplate.Execute(&replStr, r); err != nil {
return err
}
replacement := r.Replacement
if !r.ReWriteHost {
replacement = replStr.String()
}
m, err := traefik.NewRegexRedirect(r.Name, t.namespace, regexStr.String(), replacement, true)
if err != nil {
return err
}
t.buffer.Write([]byte("---\n"))
t.buffer.Write([]byte(m.String() + "\n\n"))
middlewares = append(middlewares, m)
}
// create a chain of middlewares
redirectName := t.alias + "-redirects"
chain, err := traefik.NewChain(redirectName, t.namespace, middlewares)
if err != nil {
return err
}
t.buffer.Write([]byte("---\n"))
t.buffer.Write([]byte(chain.String() + "\n\n"))
// WriteTo implicitly call
// flush
t.buffer.WriteTo(o)
return nil
}
func (t TraefikRedirect) DryRun(dest string) error {
return t.build(os.Stdout)
}
func (t TraefikRedirect) Generate() error {
if err := utils.CheckDir(t.outDir); err != nil {
return err
}
// Default file name
fileName := fmt.Sprintf("%s-generated-%s.yaml", t.alias, time.Now().Format("20060102150405"))
outPath := filepath.Join(t.outDir, fileName)
f, err := os.OpenFile(outPath, os.O_RDWR|os.O_CREATE, 0640)
if err != nil {
return err
}
defer f.Close()
return t.build(f)
}