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services_replication.go
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services_replication.go
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package bertyreplication
import (
"context"
"crypto/ed25519"
"fmt"
"time"
"go.uber.org/zap"
"gorm.io/gorm"
"berty.tech/berty/v2/go/internal/messengerutil"
"berty.tech/berty/v2/go/pkg/errcode"
orbitdb "berty.tech/go-orbit-db"
"berty.tech/go-orbit-db/iface"
"berty.tech/go-orbit-db/stores"
"berty.tech/weshnet/pkg/authtypes"
weshnet_errcode "berty.tech/weshnet/pkg/errcode"
"berty.tech/weshnet/pkg/protocoltypes"
"berty.tech/weshnet/pkg/replicationtypes"
)
type BertyOrbitDB interface {
OpenGroupReplication(ctx context.Context, g *protocoltypes.Group, options *orbitdb.CreateDBOptions) (iface.Store, iface.Store, error)
IsGroupLoaded(groupID string) bool
}
type replicationService struct {
odb BertyOrbitDB
logger *zap.Logger
ctx context.Context
db *gorm.DB
startedAt time.Time
replicationtypes.UnimplementedReplicationServiceServer
}
func (s *replicationService) ReplicateGlobalStats(ctx context.Context, request *replicationtypes.ReplicateGlobalStats_Request) (*replicationtypes.ReplicateGlobalStats_Reply, error) {
ret := &replicationtypes.ReplicateGlobalStats_Reply{}
if err := s.db.Raw("SELECT COUNT(public_key) AS replicated_groups, SUM(metadata_entries_count) AS total_metadata_entries, SUM(message_entries_count) AS total_message_entries FROM replicated_groups").Scan(&ret).Error; err != nil {
return nil, errcode.ErrDBRead.Wrap(err)
}
ret.StartedAt = s.startedAt.UnixNano()
return ret, nil
}
func (s *replicationService) ReplicateGroupStats(ctx context.Context, request *replicationtypes.ReplicateGroupStats_Request) (*replicationtypes.ReplicateGroupStats_Reply, error) {
if len(request.GroupPublicKey) == 0 {
return nil, errcode.ErrNotFound
}
g := &replicationtypes.ReplicatedGroup{}
if err := s.db.Model(&replicationtypes.ReplicatedGroup{}).Where("public_key = ?", request.GroupPublicKey).First(&g).Error; err != nil {
return nil, errcode.ErrNotFound
}
g.SignPub = ""
g.LinkKey = ""
return &replicationtypes.ReplicateGroupStats_Reply{Group: g}, nil
}
func (s *replicationService) GroupRegister(token, tokenIssuer string, group *protocoltypes.Group) error {
if token == "" {
return weshnet_errcode.ErrServiceReplication.Wrap(fmt.Errorf("missing token"))
}
if tokenIssuer == "" {
return weshnet_errcode.ErrServiceReplication.Wrap(fmt.Errorf("missing token issuer"))
}
pkStr := messengerutil.B64EncodeBytes(group.PublicKey)
linkKeyStr := messengerutil.B64EncodeBytes(group.LinkKey)
if err := s.db.Transaction(func(tx *gorm.DB) error {
count := int64(0)
if err := tx.Model(&replicationtypes.ReplicatedGroupToken{}).Where(&replicationtypes.ReplicatedGroupToken{
ReplicatedGroupPublicKey: pkStr,
TokenID: token,
}).Count(&count).Error; err != nil {
return errcode.ErrDBRead.Wrap(err)
}
if count == 1 {
return errcode.ErrDBEntryAlreadyExists
}
if err := tx.Model(&replicationtypes.ReplicatedGroup{}).Where(&replicationtypes.ReplicatedGroup{
PublicKey: pkStr,
}).Count(&count).Error; err != nil {
return err
}
if count == 0 {
tx.Model(&replicationtypes.ReplicatedGroup{}).Create(&replicationtypes.ReplicatedGroup{
PublicKey: pkStr,
SignPub: messengerutil.B64EncodeBytes(group.SignPub),
LinkKey: linkKeyStr,
CreatedAt: time.Now().UnixNano(),
UpdatedAt: time.Now().UnixNano(),
})
}
tx.Model(&replicationtypes.ReplicatedGroupToken{}).Create(&replicationtypes.ReplicatedGroupToken{
ReplicatedGroupPublicKey: pkStr,
CreatedAt: time.Now().UnixNano(),
TokenID: token,
TokenIssuer: tokenIssuer,
})
if err := s.GroupSubscribe(group, pkStr); err != nil {
return err
}
return nil
}); err != nil {
return err
}
return nil
}
func (s *replicationService) GroupSubscribe(group *protocoltypes.Group, pkStr string) error {
metadataStore, messageStore, err := s.odb.OpenGroupReplication(s.ctx, group, nil)
if err != nil {
return err
}
subMetadata, err := metadataStore.EventBus().Subscribe(new(stores.EventReplicated))
if err != nil {
return fmt.Errorf("unable to subscribe to metadata store events")
}
subMessage, err := messageStore.EventBus().Subscribe(new(stores.EventReplicated))
if err != nil {
return fmt.Errorf("unable to subscribe to message store events")
}
go func() {
defer subMetadata.Close()
defer subMessage.Close()
// @FIXME(gfanton): update group db should be run inside a goroutine to avoid channel to be stuck
for {
select {
case <-subMetadata.Out():
s.updateGroupDB(metadataStore, pkStr, updatedMetaStore)
case <-subMessage.Out():
s.updateGroupDB(messageStore, pkStr, updatedMessageStore)
case <-s.ctx.Done():
return
}
}
}()
return nil
}
type groupInfoUpdatedStore int32
const (
updatedMetaStore groupInfoUpdatedStore = iota
updatedMessageStore
)
func (s *replicationService) updateGroupDB(store iface.Store, groupPK string, field groupInfoUpdatedStore) {
if err := s.db.Transaction(func(tx *gorm.DB) error {
qb := tx.Model(&replicationtypes.ReplicatedGroup{}).Where("public_key = ?", groupPK)
replicatedGroup := &replicationtypes.ReplicatedGroup{}
if err := qb.First(&replicatedGroup).Error; err != nil {
return err
}
opsCount := int64(store.OpLog().Len())
if opsCount == 0 {
return errcode.ErrInvalidInput
}
if store.OpLog().RawHeads().Len() == 0 {
return errcode.ErrInvalidInput
}
head := store.OpLog().RawHeads().Slice()[0]
updates := map[string]interface{}{}
switch field {
case updatedMessageStore:
if opsCount >= replicatedGroup.MessageEntriesCount {
updates["message_entries_count"] = opsCount
updates["message_latest_head"] = head.GetHash().String()
}
case updatedMetaStore:
if opsCount >= replicatedGroup.MetadataEntriesCount {
updates["metadata_entries_count"] = opsCount
updates["metadata_latest_head"] = head.GetHash().String()
}
default:
return errcode.ErrInvalidInput.Wrap(fmt.Errorf("unrecognized store type"))
}
updates["updated_at"] = time.Now().UnixNano()
return qb.Updates(updates).Error
}); err != nil {
s.logger.Error("error while performing db op", zap.Error(err))
}
}
func (s *replicationService) ReplicateGroup(ctx context.Context, req *replicationtypes.ReplicationServiceReplicateGroup_Request) (*replicationtypes.ReplicationServiceReplicateGroup_Reply, error) {
token := ctx.Value(authtypes.ContextTokenHashField)
if token == nil {
return &replicationtypes.ReplicationServiceReplicateGroup_Reply{}, errcode.ErrInternal.Wrap(fmt.Errorf("no token found"))
}
if len(req.Group.SignPub) != ed25519.PublicKeySize {
return &replicationtypes.ReplicationServiceReplicateGroup_Reply{}, errcode.ErrInvalidInput.Wrap(fmt.Errorf("missing sign pub"))
}
if len(req.Group.PublicKey) != ed25519.PublicKeySize {
return &replicationtypes.ReplicationServiceReplicateGroup_Reply{}, errcode.ErrInvalidInput.Wrap(fmt.Errorf("missing public key"))
}
if len(req.Group.LinkKey) == 0 {
return &replicationtypes.ReplicationServiceReplicateGroup_Reply{}, errcode.ErrInvalidInput.Wrap(fmt.Errorf("missing link key"))
}
if len(req.Group.LinkKeySig) != ed25519.SignatureSize {
return &replicationtypes.ReplicationServiceReplicateGroup_Reply{}, errcode.ErrInvalidInput.Wrap(fmt.Errorf("missing link key signature"))
}
if ok := ed25519.Verify(req.Group.PublicKey, req.Group.LinkKey, req.Group.LinkKeySig); !ok {
return &replicationtypes.ReplicationServiceReplicateGroup_Reply{}, errcode.ErrCryptoSignatureVerification.Wrap(fmt.Errorf("invalid link key"))
}
tokenIssuer := ctx.Value(authtypes.ContextTokenIssuerField)
if tokenIssuer == nil {
return &replicationtypes.ReplicationServiceReplicateGroup_Reply{}, errcode.ErrInternal.Wrap(fmt.Errorf("no token issuer found"))
}
if _, ok := token.(string); !ok {
return &replicationtypes.ReplicationServiceReplicateGroup_Reply{}, errcode.ErrInternal.Wrap(fmt.Errorf("invalid type for token value"))
}
if _, ok := tokenIssuer.(string); !ok {
return &replicationtypes.ReplicationServiceReplicateGroup_Reply{}, errcode.ErrInternal.Wrap(fmt.Errorf("invalid type for token issuer value"))
}
err := s.GroupRegister(token.(string), tokenIssuer.(string), req.Group)
return &replicationtypes.ReplicationServiceReplicateGroup_Reply{}, err
}
func (s *replicationService) OrbitDB() BertyOrbitDB {
return s.odb
}
func (s *replicationService) Close() error {
return nil
}
var _ ReplicationService = (*replicationService)(nil)
type ReplicationService interface {
replicationtypes.ReplicationServiceServer
Close() error
}
func NewReplicationService(ctx context.Context, db *gorm.DB, odb BertyOrbitDB, logger *zap.Logger) (ReplicationService, error) {
if db == nil {
return nil, errcode.ErrInvalidInput.Wrap(fmt.Errorf("db should not be nil"))
}
if odb == nil {
return nil, errcode.ErrInvalidInput.Wrap(fmt.Errorf("odb should not be nil"))
}
if logger == nil {
logger = zap.NewNop()
}
r := &replicationService{
ctx: ctx,
logger: logger,
odb: odb,
db: db,
startedAt: time.Now(),
}
// Create/migrate models in DB
if err := db.AutoMigrate(&replicationtypes.ReplicatedGroup{}, &replicationtypes.ReplicatedGroupToken{}); err != nil {
// TODO: improve migration logic
return nil, errcode.ErrDBWrite.Wrap(err)
}
// Resubscribe to known groups
groups := []replicationtypes.ReplicatedGroup(nil)
if err := db.Model(&replicationtypes.ReplicatedGroup{}).FindInBatches(&groups, 10, func(tx *gorm.DB, batch int) error {
for _, group := range groups {
g, err := group.ToGroup()
if err != nil {
return err
}
if err := r.GroupSubscribe(g, group.PublicKey); err != nil {
logger.Error("unable to subscribe to group updates", zap.Error(err))
}
}
return nil
}).Error; err != nil {
return nil, errcode.ErrDBRead.Wrap(err)
}
return r, nil
}
type ReplicationClient interface {
replicationtypes.ReplicationServiceClient
Close() error
}