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package provider
import (
"os"
"path/filepath"
"strings"
"github.com/BurntSushi/toml"
"github.com/containous/traefik/log"
"github.com/containous/traefik/safe"
"github.com/containous/traefik/types"
"gopkg.in/fsnotify.v1"
)
var _ Provider = (*File)(nil)
// File holds configurations of the File provider.
type File struct {
BaseProvider `mapstructure:",squash"`
}
// Provide allows the provider to provide configurations to traefik
// using the given configuration channel.
func (provider *File) Provide(configurationChan chan<- types.ConfigMessage, pool *safe.Pool, constraints types.Constraints) error {
watcher, err := fsnotify.NewWatcher()
if err != nil {
log.Error("Error creating file watcher", err)
return err
}
file, err := os.Open(provider.Filename)
if err != nil {
log.Error("Error opening file", err)
return err
}
defer file.Close()
if provider.Watch {
// Process events
pool.Go(func(stop chan bool) {
defer watcher.Close()
for {
select {
case <-stop:
return
case event := <-watcher.Events:
if strings.Contains(event.Name, file.Name()) {
log.Debug("File event:", event)
configuration := provider.loadFileConfig(file.Name())
if configuration != nil {
configurationChan <- types.ConfigMessage{
ProviderName: "file",
Configuration: configuration,
}
}
}
case error := <-watcher.Errors:
log.Error("Watcher event error", error)
}
}
})
err = watcher.Add(filepath.Dir(file.Name()))
if err != nil {
log.Error("Error adding file watcher", err)
return err
}
}
configuration := provider.loadFileConfig(file.Name())
configurationChan <- types.ConfigMessage{
ProviderName: "file",
Configuration: configuration,
}
return nil
}
func (provider *File) loadFileConfig(filename string) *types.Configuration {
configuration := new(types.Configuration)
if _, err := toml.DecodeFile(filename, configuration); err != nil {
log.Error("Error reading file:", err)
return nil
}
return configuration
}
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