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46eb2755d4
65f3672f3bwallet: Refactor to use WalletLocation (João Barbosa)01a4c095c8wallet: Add WalletLocation utility class (João Barbosa) Pull request description: Advantages of this change: - avoid resolving wallet absolute path and name repetitively and in multiple places; - avoid calling `GetWalletDir` in multiple places; - extract these details from the actual wallet implementation. The `WalletLocation` class can be a way to represent a wallet not yet loaded that exists in the wallet directory. Tree-SHA512: 71ec09786e038499710e7acafe92d66ab9883fc894964e267443ae9c10a6872a10995c3987a169c436a4e793dae96b28fb97bd7f78483c4b72ac930fa23f8686
93 lines
3.4 KiB
C++
93 lines
3.4 KiB
C++
// Copyright (c) 2017-2018 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include <wallet/walletutil.h>
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#include <util/system.h>
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fs::path GetWalletDir()
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{
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fs::path path;
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if (gArgs.IsArgSet("-walletdir")) {
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path = gArgs.GetArg("-walletdir", "");
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if (!fs::is_directory(path)) {
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// If the path specified doesn't exist, we return the deliberately
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// invalid empty string.
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path = "";
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}
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} else {
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path = GetDataDir();
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// If a wallets directory exists, use that, otherwise default to GetDataDir
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if (fs::is_directory(path / "wallets")) {
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path /= "wallets";
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}
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}
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return path;
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}
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static bool IsBerkeleyBtree(const fs::path& path)
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{
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// A Berkeley DB Btree file has at least 4K.
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// This check also prevents opening lock files.
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boost::system::error_code ec;
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if (fs::file_size(path, ec) < 4096) return false;
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fs::ifstream file(path.string(), std::ios::binary);
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if (!file.is_open()) return false;
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file.seekg(12, std::ios::beg); // Magic bytes start at offset 12
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uint32_t data = 0;
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file.read((char*) &data, sizeof(data)); // Read 4 bytes of file to compare against magic
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// Berkeley DB Btree magic bytes, from:
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// https://github.com/file/file/blob/5824af38469ec1ca9ac3ffd251e7afe9dc11e227/magic/Magdir/database#L74-L75
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// - big endian systems - 00 05 31 62
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// - little endian systems - 62 31 05 00
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return data == 0x00053162 || data == 0x62310500;
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}
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std::vector<fs::path> ListWalletDir()
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{
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const fs::path wallet_dir = GetWalletDir();
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const size_t offset = wallet_dir.string().size() + 1;
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std::vector<fs::path> paths;
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for (auto it = fs::recursive_directory_iterator(wallet_dir); it != fs::recursive_directory_iterator(); ++it) {
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// Get wallet path relative to walletdir by removing walletdir from the wallet path.
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// This can be replaced by boost::filesystem::lexically_relative once boost is bumped to 1.60.
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const fs::path path = it->path().string().substr(offset);
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if (it->status().type() == fs::directory_file && IsBerkeleyBtree(it->path() / "wallet.dat")) {
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// Found a directory which contains wallet.dat btree file, add it as a wallet.
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paths.emplace_back(path);
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} else if (it.level() == 0 && it->symlink_status().type() == fs::regular_file && IsBerkeleyBtree(it->path())) {
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if (it->path().filename() == "wallet.dat") {
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// Found top-level wallet.dat btree file, add top level directory ""
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// as a wallet.
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paths.emplace_back();
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} else {
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// Found top-level btree file not called wallet.dat. Current bitcoin
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// software will never create these files but will allow them to be
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// opened in a shared database environment for backwards compatibility.
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// Add it to the list of available wallets.
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paths.emplace_back(path);
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}
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}
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}
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return paths;
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}
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WalletLocation::WalletLocation(const std::string& name)
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: m_name(name)
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, m_path(fs::absolute(name, GetWalletDir()))
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{
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}
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bool WalletLocation::Exists() const
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{
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return fs::symlink_status(m_path).type() != fs::file_not_found;
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}
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