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storage.go
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storage.go
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package certmagic
import (
"bytes"
"context"
"encoding/gob"
"errors"
"fmt"
"path"
"strings"
"time"
"github.com/caddyserver/certmagic"
"github.com/crypto-zero/go-micro/v2/store"
"github.com/crypto-zero/go-micro/v2/sync"
)
// 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 sync.Sync
store store.Store
}
func (s *storage) Lock(ctx context.Context, key string) error {
return s.lock.Lock(key, sync.LockTTL(10*time.Minute))
}
func (s *storage) Unlock(ctx context.Context, key string) error {
return s.lock.Unlock(key)
}
func (s *storage) Store(ctx context.Context, 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(ctx context.Context, key string) ([]byte, error) {
if !s.Exists(ctx, key) {
return nil, errors.New(key + " doesn't exist")
}
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(ctx context.Context, key string) error {
return s.store.Delete(key)
}
func (s *storage) Exists(ctx context.Context, key string) bool {
if _, err := s.store.Read(key); err != nil {
return false
}
return true
}
func (s *storage) List(ctx context.Context, prefix string, recursive bool) ([]string, error) {
keys, err := s.store.List()
if err != nil {
return nil, err
}
//nolint:prealloc
var results []string
for _, k := range keys {
if strings.HasPrefix(k, prefix) {
results = append(results, k)
}
}
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(ctx context.Context, 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
}
// NewStorage returns a certmagic.Storage backed by a go-micro/lock and go-micro/store
func NewStorage(lock sync.Sync, store store.Store) certmagic.Storage {
return &storage{
lock: lock,
store: store,
}
}