traefik/pkg/cli/loader_file.go

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package cli
import (
"io/ioutil"
"os"
"strings"
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"github.com/containous/traefik/v2/pkg/config/file"
"github.com/containous/traefik/v2/pkg/config/flag"
"github.com/containous/traefik/v2/pkg/log"
)
// FileLoader loads a configuration from a file.
type FileLoader struct {
ConfigFileFlag string
filename string
}
// GetFilename returns the configuration file if any.
func (f *FileLoader) GetFilename() string {
return f.filename
}
// Load loads the command's configuration from a file either specified with the -traefik.configfile flag, or from default locations.
func (f *FileLoader) Load(args []string, cmd *Command) (bool, error) {
ref, err := flag.Parse(args, cmd.Configuration)
if err != nil {
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_ = cmd.PrintHelp(os.Stdout)
return false, err
}
configFileFlag := "traefik.configfile"
if _, ok := ref["traefik.configFile"]; ok {
configFileFlag = "traefik.configFile"
}
if f.ConfigFileFlag != "" {
configFileFlag = "traefik." + f.ConfigFileFlag
if _, ok := ref[strings.ToLower(configFileFlag)]; ok {
configFileFlag = "traefik." + strings.ToLower(f.ConfigFileFlag)
}
}
configFile, err := loadConfigFiles(ref[configFileFlag], cmd.Configuration)
if err != nil {
return false, err
}
f.filename = configFile
if configFile == "" {
return false, nil
}
logger := log.WithoutContext()
logger.Printf("Configuration loaded from file: %s", configFile)
content, _ := ioutil.ReadFile(configFile)
logger.Debug(string(content))
return true, nil
}
// loadConfigFiles tries to decode the given configuration file and all default locations for the configuration file.
// It stops as soon as decoding one of them is successful.
func loadConfigFiles(configFile string, element interface{}) (string, error) {
finder := Finder{
BasePaths: []string{"/etc/traefik/traefik", "$XDG_CONFIG_HOME/traefik", "$HOME/.config/traefik", "./traefik"},
Extensions: []string{"toml", "yaml", "yml"},
}
filePath, err := finder.Find(configFile)
if err != nil {
return "", err
}
if len(filePath) == 0 {
return "", nil
}
if err = file.Decode(filePath, element); err != nil {
return "", err
}
return filePath, nil
}