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feat: introduce coinjoinsalt RPC to allow manipulating per-wallet salt
Co-authored-by: thephez <thephez@users.noreply.github.com> Co-authored-by: UdjinM6 <UdjinM6@users.noreply.github.com>
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Kittywhiskers Van Gogh
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doc/release-notes-6093.md
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4
doc/release-notes-6093.md
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@ -0,0 +1,4 @@
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New functionality
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-----------
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- A new RPC command, `coinjoinsalt`, allows for manipulating a CoinJoin salt stored in a wallet. `coinjoinsalt get` will fetch an existing salt, `coinjoinsalt set` will allow setting a custom salt and `coinjoinsalt generate` will set a random hash as the new salt.
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@ -181,6 +181,193 @@ static RPCHelpMan coinjoin_stop()
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},
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};
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}
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static RPCHelpMan coinjoinsalt()
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{
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return RPCHelpMan{"coinjoinsalt",
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"\nAvailable commands:\n"
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" generate - Generate new CoinJoin salt\n"
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" get - Fetch existing CoinJoin salt\n"
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" set - Set new CoinJoin salt\n",
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{
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{"command", RPCArg::Type::STR, RPCArg::Optional::NO, "The command to execute"},
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},
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RPCResults{},
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RPCExamples{""},
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[&](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue
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{
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throw JSONRPCError(RPC_INVALID_PARAMETER, "Must be a valid command");
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},
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};
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}
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static RPCHelpMan coinjoinsalt_generate()
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{
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return RPCHelpMan{"coinjoinsalt generate",
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"\nGenerate new CoinJoin salt and store it in the wallet database\n"
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"Cannot generate new salt if CoinJoin mixing is in process or wallet has private keys disabled.\n",
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{
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{"overwrite", RPCArg::Type::BOOL, /* default */ "false", "Generate new salt even if there is an existing salt and/or there is CoinJoin balance"},
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},
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RPCResult{
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RPCResult::Type::BOOL, "", "Status of CoinJoin salt generation and commitment"
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},
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RPCExamples{
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HelpExampleCli("coinjoinsalt generate", "")
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+ HelpExampleRpc("coinjoinsalt generate", "")
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},
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[&](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue
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{
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std::shared_ptr<CWallet> const wallet = GetWalletForJSONRPCRequest(request);
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if (!wallet) return NullUniValue;
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const auto str_wallet = wallet->GetName();
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if (wallet->IsWalletFlagSet(WALLET_FLAG_DISABLE_PRIVATE_KEYS)) {
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throw JSONRPCError(RPC_INVALID_REQUEST,
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strprintf("Wallet \"%s\" has private keys disabled, cannot perform CoinJoin!", str_wallet));
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}
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bool enable_overwrite{false}; // Default value
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if (!request.params[0].isNull()) {
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enable_overwrite = ParseBoolV(request.params[0], "overwrite");
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}
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if (!enable_overwrite && !wallet->GetCoinJoinSalt().IsNull()) {
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throw JSONRPCError(RPC_INVALID_REQUEST,
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strprintf("Wallet \"%s\" already has set CoinJoin salt!", str_wallet));
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}
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const NodeContext& node = EnsureAnyNodeContext(request.context);
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if (node.coinjoin_loader != nullptr) {
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auto cj_clientman = node.coinjoin_loader->walletman().Get(wallet->GetName());
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if (cj_clientman != nullptr && cj_clientman->IsMixing()) {
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throw JSONRPCError(RPC_WALLET_ERROR,
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strprintf("Wallet \"%s\" is currently mixing, cannot change salt!", str_wallet));
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}
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}
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const auto wallet_balance{wallet->GetBalance()};
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const bool has_balance{(wallet_balance.m_anonymized
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+ wallet_balance.m_denominated_trusted
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+ wallet_balance.m_denominated_untrusted_pending) > 0};
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if (!enable_overwrite && has_balance) {
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throw JSONRPCError(RPC_WALLET_ERROR,
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strprintf("Wallet \"%s\" has CoinJoin balance, cannot continue!", str_wallet));
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}
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if (!wallet->SetCoinJoinSalt(GetRandHash())) {
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throw JSONRPCError(RPC_INVALID_REQUEST,
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strprintf("Unable to set new CoinJoin salt for wallet \"%s\"!", str_wallet));
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}
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wallet->ClearCoinJoinRoundsCache();
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return true;
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},
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};
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}
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static RPCHelpMan coinjoinsalt_get()
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{
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return RPCHelpMan{"coinjoinsalt get",
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"\nFetch existing CoinJoin salt\n"
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"Cannot fetch salt if wallet has private keys disabled.\n",
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{},
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RPCResult{
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RPCResult::Type::STR_HEX, "", "CoinJoin salt"
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},
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RPCExamples{
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HelpExampleCli("coinjoinsalt get", "")
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+ HelpExampleRpc("coinjoinsalt get", "")
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},
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[&](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue
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{
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std::shared_ptr<CWallet> const wallet = GetWalletForJSONRPCRequest(request);
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if (!wallet) return NullUniValue;
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const auto str_wallet = wallet->GetName();
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if (wallet->IsWalletFlagSet(WALLET_FLAG_DISABLE_PRIVATE_KEYS)) {
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throw JSONRPCError(RPC_INVALID_REQUEST,
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strprintf("Wallet \"%s\" has private keys disabled, cannot perform CoinJoin!", str_wallet));
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}
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const auto salt{wallet->GetCoinJoinSalt()};
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if (salt.IsNull()) {
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throw JSONRPCError(RPC_WALLET_ERROR,
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strprintf("Wallet \"%s\" has no CoinJoin salt!", str_wallet));
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}
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return salt.GetHex();
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},
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};
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}
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static RPCHelpMan coinjoinsalt_set()
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{
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return RPCHelpMan{"coinjoinsalt set",
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"\nSet new CoinJoin salt\n"
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"Cannot set salt if CoinJoin mixing is in process or wallet has private keys disabled.\n"
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"Will overwrite existing salt. The presence of a CoinJoin balance will cause the wallet to rescan.\n",
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{
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{"salt", RPCArg::Type::STR, RPCArg::Optional::NO, "Desired CoinJoin salt value for the wallet"},
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{"overwrite", RPCArg::Type::BOOL, /* default */ "false", "Overwrite salt even if CoinJoin balance present"},
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},
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RPCResult{
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RPCResult::Type::BOOL, "", "Status of CoinJoin salt change request"
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},
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RPCExamples{
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HelpExampleCli("coinjoinsalt set", "f4184fc596403b9d638783cf57adfe4c75c605f6356fbc91338530e9831e9e16")
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+ HelpExampleRpc("coinjoinsalt set", "f4184fc596403b9d638783cf57adfe4c75c605f6356fbc91338530e9831e9e16")
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},
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[&](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue
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{
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std::shared_ptr<CWallet> const wallet = GetWalletForJSONRPCRequest(request);
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if (!wallet) return NullUniValue;
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const auto salt{ParseHashV(request.params[0], "salt")};
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if (salt == uint256::ZERO) {
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throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid CoinJoin salt value");
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}
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bool enable_overwrite{false}; // Default value
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if (!request.params[1].isNull()) {
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enable_overwrite = ParseBoolV(request.params[1], "overwrite");
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}
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const auto str_wallet = wallet->GetName();
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if (wallet->IsWalletFlagSet(WALLET_FLAG_DISABLE_PRIVATE_KEYS)) {
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throw JSONRPCError(RPC_INVALID_REQUEST,
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strprintf("Wallet \"%s\" has private keys disabled, cannot perform CoinJoin!", str_wallet));
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}
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const NodeContext& node = EnsureAnyNodeContext(request.context);
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if (node.coinjoin_loader != nullptr) {
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auto cj_clientman = node.coinjoin_loader->walletman().Get(wallet->GetName());
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if (cj_clientman != nullptr && cj_clientman->IsMixing()) {
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throw JSONRPCError(RPC_WALLET_ERROR,
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strprintf("Wallet \"%s\" is currently mixing, cannot change salt!", str_wallet));
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}
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}
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const auto wallet_balance{wallet->GetBalance()};
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const bool has_balance{(wallet_balance.m_anonymized
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+ wallet_balance.m_denominated_trusted
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+ wallet_balance.m_denominated_untrusted_pending) > 0};
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if (has_balance && !enable_overwrite) {
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throw JSONRPCError(RPC_WALLET_ERROR,
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strprintf("Wallet \"%s\" has CoinJoin balance, cannot continue!", str_wallet));
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}
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if (!wallet->SetCoinJoinSalt(salt)) {
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throw JSONRPCError(RPC_WALLET_ERROR,
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strprintf("Unable to set new CoinJoin salt for wallet \"%s\"!", str_wallet));
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}
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wallet->ClearCoinJoinRoundsCache();
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return true;
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},
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};
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}
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#endif // ENABLE_WALLET
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static RPCHelpMan getpoolinfo()
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@ -295,6 +482,10 @@ static const CRPCCommand commands[] =
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{ "dash", &coinjoin_reset, },
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{ "dash", &coinjoin_start, },
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{ "dash", &coinjoin_stop, },
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{ "dash", &coinjoinsalt, },
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{ "dash", &coinjoinsalt_generate, },
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{ "dash", &coinjoinsalt_get, },
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{ "dash", &coinjoinsalt_set, },
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#endif // ENABLE_WALLET
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};
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// clang-format on
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@ -1448,6 +1448,15 @@ int CWallet::GetCappedOutpointCoinJoinRounds(const COutPoint& outpoint) const
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return realCoinJoinRounds > CCoinJoinClientOptions::GetRounds() ? CCoinJoinClientOptions::GetRounds() : realCoinJoinRounds;
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}
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void CWallet::ClearCoinJoinRoundsCache()
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{
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LOCK(cs_wallet);
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mapOutpointRoundsCache.clear();
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MarkDirty();
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// Notify UI
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NotifyTransactionChanged(uint256::ONE, CT_UPDATED);
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}
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bool CWallet::IsDenominated(const COutPoint& outpoint) const
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{
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LOCK(cs_wallet);
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@ -747,7 +747,7 @@ private:
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void AddToSpends(const uint256& wtxid) EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);
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std::set<COutPoint> setWalletUTXO;
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mutable std::map<COutPoint, int> mapOutpointRoundsCache;
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mutable std::map<COutPoint, int> mapOutpointRoundsCache GUARDED_BY(cs_wallet);
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/**
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* Add a transaction to the wallet, or update it. pIndex and posInBlock should
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@ -995,6 +995,8 @@ public:
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int GetRealOutpointCoinJoinRounds(const COutPoint& outpoint, int nRounds = 0) const;
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// respect current settings
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int GetCappedOutpointCoinJoinRounds(const COutPoint& outpoint) const;
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// drop the internal cache to let Get...Rounds recalculate CJ balance from scratch and notify UI
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void ClearCoinJoinRoundsCache();
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bool IsDenominated(const COutPoint& outpoint) const;
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bool IsFullyMixed(const COutPoint& outpoint) const;
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