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#include <common/json_command.h>
#include <common/jsonrpc_errors.h>
#include <common/wallet_tx.h>
#include <inttypes.h>
#include <wallet/wallet.h>
void wtx_init(struct command *cmd, struct wallet_tx *wtx, struct amount_sat max)
{
wtx->cmd = cmd;
wtx->amount = max;
}
struct command_result *param_wtx(struct command *cmd,
const char *name,
const char *buffer,
const jsmntok_t *tok,
struct wallet_tx *wtx)
{
struct amount_sat max = wtx->amount;
if (json_tok_streq(buffer, tok, "all")) {
wtx->all_funds = true;
return NULL;
}
wtx->all_funds = false;
if (!parse_amount_sat(&wtx->amount,
buffer + tok->start, tok->end - tok->start))
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"'%s' should be satoshis or 'all', not '%.*s'",
name,
tok->end - tok->start,
buffer + tok->start);
if (amount_sat_greater(wtx->amount, max))
return command_fail(wtx->cmd, FUND_MAX_EXCEEDED,
"Amount exceeded %s",
type_to_string(tmpctx, struct amount_sat,
&max));
return NULL;
}
static struct command_result *check_amount(const struct wallet_tx *wtx,
struct amount_sat amount)
{
if (tal_count(wtx->utxos) == 0) {
return command_fail(wtx->cmd, FUND_CANNOT_AFFORD,
"Cannot afford transaction");
}
if (amount_sat_less(amount, get_chainparams(wtx->cmd->ld)->dust_limit)) {
return command_fail(wtx->cmd, FUND_OUTPUT_IS_DUST,
"Output %s would be dust",
type_to_string(tmpctx, struct amount_sat,
&amount));
}
return NULL;
}
struct command_result *wtx_select_utxos(struct wallet_tx *tx,
u32 fee_rate_per_kw,
size_t out_len,
u32 maxheight)
{
struct command_result *res;
struct amount_sat fee_estimate;
if (tx->all_funds) {
struct amount_sat amount;
tx->utxos = wallet_select_all(tx->cmd, tx->cmd->ld->wallet,
fee_rate_per_kw, out_len,
maxheight,
&amount,
&fee_estimate);
res = check_amount(tx, amount);
if (res)
return res;
/* tx->amount is max permissible */
if (amount_sat_less_eq(amount, tx->amount)) {
tx->change = AMOUNT_SAT(0);
tx->change_key_index = 0;
tx->amount = amount;
return NULL;
}
/* Too much? Try again, but ask for limit instead. */
tx->all_funds = false;
tx->utxos = tal_free(tx->utxos);
}
tx->utxos = wallet_select_coins(tx->cmd, tx->cmd->ld->wallet,
tx->amount,
fee_rate_per_kw, out_len,
maxheight,
&fee_estimate, &tx->change);
res = check_amount(tx, tx->amount);
if (res)
return res;
if (amount_sat_less(tx->change, get_chainparams(tx->cmd->ld)->dust_limit)) {
tx->change = AMOUNT_SAT(0);
tx->change_key_index = 0;
} else {
tx->change_key_index = wallet_get_newindex(tx->cmd->ld);
}
return NULL;
}