wallet.go

// Copyright 2019, 2020 Weald Technology Trading
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// Package scratch provides an in-memory store.  It is ephemeral, and should not be used where accounts are required to be stored.
package scratch

import (
	"encoding/json"
	"errors"

	"github.com/google/uuid"
)

// StoreWallet stores wallet-level data.
func (s *Store) StoreWallet(walletID uuid.UUID, _ string, data []byte) error {
	s.walletMu.Lock()
	s.wallets[walletID.String()] = data
	if _, exists := s.accounts[walletID.String()]; !exists {
		s.accountMu.Lock()
		s.accounts[walletID.String()] = make(map[string][]byte)
		s.accountMu.Unlock()
	}
	s.walletMu.Unlock()

	return nil
}

// RetrieveWallet retrieves wallet-level data.  It will fail if it cannot retrieve the data.
func (s *Store) RetrieveWallet(walletName string) ([]byte, error) {
	for data := range s.RetrieveWallets() {
		info := &struct {
			Name string `json:"name"`
		}{}
		err := json.Unmarshal(data, info)
		if err == nil && info.Name == walletName {
			return data, nil
		}
	}

	return nil, errors.New("wallet not found")
}

// RetrieveWalletByID retrieves wallet-level data.  It will fail if it cannot retrieve the data.
func (s *Store) RetrieveWalletByID(walletID uuid.UUID) ([]byte, error) {
	for data := range s.RetrieveWallets() {
		info := &struct {
			ID uuid.UUID `json:"uuid"`
		}{}
		err := json.Unmarshal(data, info)
		if err == nil && info.ID == walletID {
			return data, nil
		}
	}

	return nil, errors.New("wallet not found")
}

// RetrieveWallets retrieves wallet-level data for all wallets.
func (s *Store) RetrieveWallets() <-chan []byte {
	ch := make(chan []byte, 1024)
	go func() {
		s.walletMu.RLock()
		for _, data := range s.wallets {
			ch <- data
		}
		close(ch)
		s.walletMu.RUnlock()
	}()

	return ch
}