70 lines
1.5 KiB
C
70 lines
1.5 KiB
C
#include <common/wallet_tx.h>
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#include <inttypes.h>
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#include <lightningd/jsonrpc_errors.h>
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#include <wallet/wallet.h>
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void wtx_init(struct command *cmd, struct wallet_tx * wtx)
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{
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wtx->cmd = cmd;
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wtx->amount = 0;
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wtx->change_key_index = 0;
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wtx->utxos = NULL;
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wtx->all_funds = false;
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}
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static bool check_amount(const struct wallet_tx *tx, u64 amount)
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{
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if (tal_count(tx->utxos) == 0) {
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command_fail(tx->cmd, FUND_CANNOT_AFFORD,
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"Cannot afford transaction");
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return false;
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}
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if (amount < 546) {
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command_fail(tx->cmd, FUND_OUTPUT_IS_DUST,
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"Output %"PRIu64" satoshis would be dust",
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amount);
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return false;
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}
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return true;
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}
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bool wtx_select_utxos(struct wallet_tx * tx, u32 fee_rate_per_kw,
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size_t out_len)
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{
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u64 fee_estimate;
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if (tx->all_funds) {
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u64 amount;
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tx->utxos = wallet_select_all(tx->cmd, tx->cmd->ld->wallet,
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fee_rate_per_kw, out_len,
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&amount,
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&fee_estimate);
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if (!check_amount(tx, amount))
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return false;
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if (amount <= tx->amount) {
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tx->change = 0;
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tx->amount = amount;
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return true;
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}
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/* Too much? Try again, but ask for limit instead. */
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tx->all_funds = false;
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tx->utxos = tal_free(tx->utxos);
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}
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tx->utxos = wallet_select_coins(tx->cmd, tx->cmd->ld->wallet,
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tx->amount,
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fee_rate_per_kw, out_len,
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&fee_estimate, &tx->change);
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if (!check_amount(tx, tx->amount))
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return false;
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if (tx->change < 546) {
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tx->change = 0;
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tx->change_key_index = 0;
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} else {
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tx->change_key_index = wallet_get_newindex(tx->cmd->ld);
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}
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return true;
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}
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