// Fetch a message from storage, delete if it is a one-time message
func (store Store) Fetch(messageID *[message.MessageIDSize]byte) ([]byte, error) {
data := store.messages.Index(messageID[:]).GetLast()
if data == nil || len(data) < MaxMessageSize+structs.MessageStructSize {
return nil, ErrNotFound
}
msgStruct := structs.MessageStructDecode(data[:structs.MessageStructSize])
if msgStruct.OneTime {
store.messages.Index(messageID[:]).Truncate()
signerLoaded := structs.SignerStructDecode(store.signers.Index(msgStruct.SignerPub[:]).GetLast())
if signerLoaded != nil {
signerLoaded.MessagesRetained--
store.signers.Index(msgStruct.SignerPub[:]).Append(signerLoaded.Encode().Fill())
}
}
return data[structs.MessageStructSize:], nil
}
// updateKeyIndex updates a key index by writing the new struct with an increased counter
func updateKeyIndex(tx fileback.Tx, msgStruct *structs.MessageStruct, msgStructEncoded structs.MessageStructEncoded) error { // Ignore errors
prev := tx.GetLast()
if prev == nil {
log.Errors("messagestore, globalindex getLast: NIL")
err := tx.Append(msgStructEncoded)
return err
}
prevStr := structs.MessageStructDecode(prev)
if prevStr == nil {
log.Errors("messagestore, globalindex decode: NIL")
err := tx.Append(msgStructEncoded)
return err
}
msgStruct.Counter = prevStr.Counter + 1 // Increase counter
msgStructEncoded = msgStruct.Encode().Fill()
err := tx.Append(msgStructEncoded)
return err
}
// PreExpire expires a message in the next expire run
func (store Store) PreExpire(messageID *[message.MessageIDSize]byte, pubkey *message.Curve25519Key) error {
data := store.messages.Index(messageID[:]).GetLast()
if data == nil || len(data) < MaxMessageSize+structs.MessageStructSize {
return ErrNotFound
}
msgStruct := structs.MessageStructDecode(data[:structs.MessageStructSize])
if msgStruct.ReceiverConstantPubKey == *pubkey {
// Add to expire
expire := &structs.ExpireStruct{
ExpireTime: uint64(time.Now().Unix()),
MessageID: msgStruct.MessageID,
SignerPubKey: msgStruct.SignerPub,
}
expireTime := (uint64(time.Now().Unix()) / uint64(ExpireRun)) + uint64(ExpireRun)
return store.expireindex.Index(utils.EncodeUInt64(expireTime)).CreateAppend(expire.Encode().Fill())
}
return ErrNotFound
}
func lineToMsgStruct(d []byte) *structs.MessageStruct {
return structs.MessageStructDecode(d)
}