Add cert store option based on sqlite3, mysql & postgres (#173)

Deprecate **pogreb**!

close #169

Reviewed-on: https://codeberg.org/Codeberg/pages-server/pulls/173

server/database/pogreb.go

@@ -0,0 +1,134 @@
+package database
+
+import (
+	"bytes"
+	"context"
+	"encoding/gob"
+	"errors"
+	"fmt"
+	"time"
+
+	"github.com/akrylysov/pogreb"
+	"github.com/akrylysov/pogreb/fs"
+	"github.com/go-acme/lego/v4/certificate"
+	"github.com/rs/zerolog/log"
+)
+
+var _ CertDB = aDB{}
+
+type aDB struct {
+	ctx          context.Context
+	cancel       context.CancelFunc
+	intern       *pogreb.DB
+	syncInterval time.Duration
+}
+
+func (p aDB) Close() error {
+	p.cancel()
+	return p.intern.Sync()
+}
+
+func (p aDB) Put(name string, cert *certificate.Resource) error {
+	var resGob bytes.Buffer
+	if err := gob.NewEncoder(&resGob).Encode(cert); err != nil {
+		return err
+	}
+	return p.intern.Put([]byte(name), resGob.Bytes())
+}
+
+func (p aDB) Get(name string) (*certificate.Resource, error) {
+	cert := &certificate.Resource{}
+	resBytes, err := p.intern.Get([]byte(name))
+	if err != nil {
+		return nil, err
+	}
+	if resBytes == nil {
+		return nil, nil
+	}
+	if err := gob.NewDecoder(bytes.NewBuffer(resBytes)).Decode(cert); err != nil {
+		return nil, err
+	}
+	return cert, nil
+}
+
+func (p aDB) Delete(key string) error {
+	return p.intern.Delete([]byte(key))
+}
+
+func (p aDB) Compact() (string, error) {
+	result, err := p.intern.Compact()
+	if err != nil {
+		return "", err
+	}
+	return fmt.Sprintf("%+v", result), nil
+}
+
+func (p aDB) Items(_, _ int) ([]*Cert, error) {
+	items := make([]*Cert, 0, p.intern.Count())
+	iterator := p.intern.Items()
+	for {
+		key, resBytes, err := iterator.Next()
+		if err != nil {
+			if errors.Is(err, pogreb.ErrIterationDone) {
+				break
+			}
+			return nil, err
+		}
+
+		res := &certificate.Resource{}
+		if err := gob.NewDecoder(bytes.NewBuffer(resBytes)).Decode(res); err != nil {
+			return nil, err
+		}
+
+		cert, err := toCert(string(key), res)
+		if err != nil {
+			return nil, err
+		}
+
+		items = append(items, cert)
+	}
+
+	return items, nil
+}
+
+var _ CertDB = &aDB{}
+
+func (p aDB) sync() {
+	for {
+		err := p.intern.Sync()
+		if err != nil {
+			log.Error().Err(err).Msg("Syncing cert database failed")
+		}
+		select {
+		case <-p.ctx.Done():
+			return
+		case <-time.After(p.syncInterval):
+		}
+	}
+}
+
+func NewPogreb(path string) (CertDB, error) {
+	if path == "" {
+		return nil, fmt.Errorf("path not set")
+	}
+	db, err := pogreb.Open(path, &pogreb.Options{
+		BackgroundSyncInterval:       30 * time.Second,
+		BackgroundCompactionInterval: 6 * time.Hour,
+		FileSystem:                   fs.OSMMap,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	ctx, cancel := context.WithCancel(context.Background())
+	result := &aDB{
+		ctx:          ctx,
+		cancel:       cancel,
+		intern:       db,
+		syncInterval: 5 * time.Minute,
+	}
+
+	go result.sync()
+
+	return result, nil
+}