Implementation of certmagic storage using micro's store and sync packages

api/server/acme/certmagic/storage.go

@@ -0,0 +1,134 @@
+package certmagic
+
+import (
+	"bytes"
+	"encoding/gob"
+	"fmt"
+	"path"
+	"strings"
+	"time"
+
+	"github.com/mholt/certmagic"
+	"github.com/micro/go-micro/store"
+	"github.com/micro/go-micro/sync/lock"
+)
+
+// file represents a "file" that will be stored in store.Store - the contents and last modified time
+type file struct {
+	// last modified time
+	lastModified time.Time
+	// contents
+	contents []byte
+}
+
+// storage is an implementation of certmagic.Storage using micro's sync.Map and store.Store interfaces.
+// As certmagic storage expects a filesystem (with stat() abilities) we have to implement
+// the bare minimum of metadata.
+type storage struct {
+	lock  lock.Lock
+	store store.Store
+}
+
+func (s *storage) Lock(key string) error {
+	return s.lock.Acquire(key, lock.TTL(10*time.Minute))
+}
+
+func (s *storage) Unlock(key string) error {
+	return s.lock.Release(key)
+}
+
+func (s *storage) Store(key string, value []byte) error {
+	f := file{
+		lastModified: time.Now(),
+		contents:     value,
+	}
+	buf := &bytes.Buffer{}
+	e := gob.NewEncoder(buf)
+	if err := e.Encode(f); err != nil {
+		return err
+	}
+	r := &store.Record{
+		Key:   key,
+		Value: buf.Bytes(),
+	}
+	return s.store.Write(r)
+}
+
+func (s *storage) Load(key string) ([]byte, error) {
+	records, err := s.store.Read(key)
+	if err != nil {
+		return nil, err
+	}
+	if len(records) != 1 {
+		return nil, fmt.Errorf("ACME Storage: multiple records matched key %s", key)
+	}
+	b := bytes.NewBuffer(records[0].Value)
+	d := gob.NewDecoder(b)
+	var f file
+	err = d.Decode(&f)
+	if err != nil {
+		return nil, err
+	}
+	return f.contents, nil
+}
+
+func (s *storage) Delete(key string) error {
+	return s.store.Delete(key)
+}
+
+func (s *storage) Exists(key string) bool {
+	_, err := s.store.Read()
+	if err != nil {
+		return false
+	}
+	return true
+}
+
+func (s *storage) List(prefix string, recursive bool) ([]string, error) {
+	records, err := s.store.Sync()
+	if err != nil {
+		return nil, err
+	}
+	var results []string
+	for _, r := range records {
+		if strings.HasPrefix(r.Key, prefix) {
+			results = append(results, r.Key)
+		}
+	}
+	if recursive {
+		return results, nil
+	}
+	keysMap := make(map[string]bool)
+	for _, key := range results {
+		dir := strings.Split(strings.TrimPrefix(key, prefix+"/"), "/")
+		keysMap[dir[0]] = true
+	}
+	results = make([]string, 0)
+	for k := range keysMap {
+		results = append(results, path.Join(prefix, k))
+	}
+	return results, nil
+}
+
+func (s *storage) Stat(key string) (certmagic.KeyInfo, error) {
+	records, err := s.store.Read(key)
+	if err != nil {
+		return certmagic.KeyInfo{}, err
+	}
+	if len(records) != 1 {
+		return certmagic.KeyInfo{}, fmt.Errorf("ACME Storage: multiple records matched key %s", key)
+	}
+	b := bytes.NewBuffer(records[0].Value)
+	d := gob.NewDecoder(b)
+	var f file
+	err = d.Decode(&f)
+	if err != nil {
+		return certmagic.KeyInfo{}, err
+	}
+	return certmagic.KeyInfo{
+		Key:        key,
+		Modified:   f.lastModified,
+		Size:       int64(len(f.contents)),
+		IsTerminal: false,
+	}, nil
+}