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file.go
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file.go
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package file
import (
"fmt"
"io/ioutil"
"path"
"strings"
"github.com/BurntSushi/toml"
"github.com/containous/traefik/log"
"github.com/containous/traefik/provider"
"github.com/containous/traefik/safe"
"github.com/containous/traefik/types"
"gopkg.in/fsnotify.v1"
)
var _ provider.Provider = (*Provider)(nil)
// Provider holds configurations of the provider.
type Provider struct {
provider.BaseProvider `mapstructure:",squash" export:"true"`
Directory string `description:"Load configuration from one or more .toml files in a directory" export:"true"`
}
// Provide allows the file provider to provide configurations to traefik
// using the given configuration channel.
func (p *Provider) Provide(configurationChan chan<- types.ConfigMessage, pool *safe.Pool, constraints types.Constraints) error {
configuration, err := p.loadConfig()
if err != nil {
return err
}
if p.Watch {
var watchItem string
if p.Directory != "" {
watchItem = p.Directory
} else {
watchItem = p.Filename
}
if err := p.addWatcher(pool, watchItem, configurationChan, p.watcherCallback); err != nil {
return err
}
}
sendConfigToChannel(configurationChan, configuration)
return nil
}
func (p *Provider) addWatcher(pool *safe.Pool, directory string, configurationChan chan<- types.ConfigMessage, callback func(chan<- types.ConfigMessage, fsnotify.Event)) error {
watcher, err := fsnotify.NewWatcher()
if err != nil {
return fmt.Errorf("error creating file watcher: %s", err)
}
// Process events
pool.Go(func(stop chan bool) {
defer watcher.Close()
for {
select {
case <-stop:
return
case evt := <-watcher.Events:
callback(configurationChan, evt)
case err := <-watcher.Errors:
log.Errorf("Watcher event error: %s", err)
}
}
})
err = watcher.Add(directory)
if err != nil {
return fmt.Errorf("error adding file watcher: %s", err)
}
return nil
}
func sendConfigToChannel(configurationChan chan<- types.ConfigMessage, configuration *types.Configuration) {
configurationChan <- types.ConfigMessage{
ProviderName: "file",
Configuration: configuration,
}
}
func loadFileConfig(filename string) (*types.Configuration, error) {
configuration := new(types.Configuration)
if _, err := toml.DecodeFile(filename, configuration); err != nil {
return nil, fmt.Errorf("error reading configuration file: %s", err)
}
return configuration, nil
}
func loadFileConfigFromDirectory(directory string) (*types.Configuration, error) {
fileList, err := ioutil.ReadDir(directory)
if err != nil {
return nil, fmt.Errorf("unable to read directory %s: %v", directory, err)
}
configuration := &types.Configuration{
Frontends: make(map[string]*types.Frontend),
Backends: make(map[string]*types.Backend),
}
for _, file := range fileList {
if !strings.HasSuffix(file.Name(), ".toml") {
continue
}
var c *types.Configuration
c, err = loadFileConfig(path.Join(directory, file.Name()))
if err != nil {
return nil, err
}
for backendName, backend := range c.Backends {
if _, exists := configuration.Backends[backendName]; exists {
log.Warnf("Backend %s already configured, skipping", backendName)
} else {
configuration.Backends[backendName] = backend
}
}
for frontendName, frontend := range c.Frontends {
if _, exists := configuration.Frontends[frontendName]; exists {
log.Warnf("Frontend %s already configured, skipping", frontendName)
} else {
configuration.Frontends[frontendName] = frontend
}
}
}
return configuration, nil
}
func (p *Provider) watcherCallback(configurationChan chan<- types.ConfigMessage, event fsnotify.Event) {
configuration, err := p.loadConfig()
if err != nil {
log.Errorf("Error occurred during watcher callback: %s", err)
return
}
sendConfigToChannel(configurationChan, configuration)
}
func (p *Provider) loadConfig() (*types.Configuration, error) {
if p.Directory != "" {
return loadFileConfigFromDirectory(p.Directory)
}
return loadFileConfig(p.Filename)
}