traefik/provider/acme/local_store.go

package acme

import (
	"encoding/json"
	"io/ioutil"
	"os"

	"github.com/containous/traefik/log"
	"github.com/containous/traefik/safe"
)

var _ Store = (*LocalStore)(nil)

// LocalStore Store implementation for local file
type LocalStore struct {
	filename     string
	storedData   *StoredData
	SaveDataChan chan *StoredData
}

// NewLocalStore initializes a new LocalStore with a file name
func NewLocalStore(filename string) LocalStore {
	store := LocalStore{filename: filename, SaveDataChan: make(chan *StoredData)}
	store.listenSaveAction()
	return store
}

func (s *LocalStore) get() (*StoredData, error) {
	if s.storedData == nil {
		s.storedData = &StoredData{HTTPChallenges: make(map[string]map[string][]byte)}

		f, err := os.Open(s.filename)
		if err != nil {
			return nil, err
		}
		defer f.Close()

		file, err := ioutil.ReadAll(f)
		if err != nil {
			return nil, err
		}

		if len(file) > 0 {
			if err := json.Unmarshal(file, s.storedData); err != nil {
				return nil, err
			}
		}
	}

	return s.storedData, nil
}

// listenSaveAction listens to a chan to store ACME data in json format into LocalStore.filename
func (s *LocalStore) listenSaveAction() {
	safe.Go(func() {
		for object := range s.SaveDataChan {
			data, err := json.MarshalIndent(object, "", "  ")
			if err != nil {
				log.Error(err)
			}

			err = ioutil.WriteFile(s.filename, data, 0600)
			if err != nil {
				log.Error(err)
			}
		}
	})
}

// GetAccount returns ACME Account
func (s *LocalStore) GetAccount() (*Account, error) {
	storedData, err := s.get()
	if err != nil {
		return nil, err
	}

	return storedData.Account, nil
}

// SaveAccount stores ACME Account
func (s *LocalStore) SaveAccount(account *Account) error {
	storedData, err := s.get()
	if err != nil {
		return err
	}

	storedData.Account = account
	s.SaveDataChan <- storedData

	return nil
}

// GetCertificates returns ACME Certificates list
func (s *LocalStore) GetCertificates() ([]*Certificate, error) {
	storedData, err := s.get()
	if err != nil {
		return nil, err
	}

	return storedData.Certificates, nil
}

// SaveCertificates stores ACME Certificates list
func (s *LocalStore) SaveCertificates(certificates []*Certificate) error {
	storedData, err := s.get()
	if err != nil {
		return err
	}

	storedData.Certificates = certificates
	s.SaveDataChan <- storedData

	return nil
}

// GetHTTPChallenges returns ACME HTTP Challenges list
func (s *LocalStore) GetHTTPChallenges() (map[string]map[string][]byte, error) {
	return s.storedData.HTTPChallenges, nil
}

// SaveHTTPChallenges stores ACME HTTP Challenges list
func (s *LocalStore) SaveHTTPChallenges(httpChallenges map[string]map[string][]byte) error {
	s.storedData.HTTPChallenges = httpChallenges
	return nil
}