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wallet_get_newindex: encapsulate routine to get a new keyindex.

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We'll want this for shutdown.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2017-06-25 12:03:13 +09:30
parent ee00c2c508
commit a0800e352a
3 changed files with 26 additions and 9 deletions
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11
wallet/wallet.c
View file

@ -2,6 +2,7 @@
#include <bitcoin/script.h>
#include <ccan/str/hex/hex.h>
#include <lightningd/lightningd.h>
struct wallet *wallet_new(const tal_t *ctx, struct log *log)
{
@ -221,3 +222,13 @@ bool wallet_can_spend(struct wallet *w, const u8 *script,
return false;
}
s64 wallet_get_newindex(struct lightningd *ld)
{
u64 newidx = db_get_intvar(ld->wallet->db, "bip32_max_index", 0) + 1;
if (newidx == BIP32_INITIAL_HARDENED_CHILD)
return -1;
db_set_intvar(ld->wallet->db, "bip32_max_index", newidx);
return newidx;
}

10
wallet/wallet.h
View file

@ -7,6 +7,8 @@
#include <lightningd/utxo.h>
#include <wally_bip32.h>
struct lightningd;
struct wallet {
struct db *db;
struct log *log;
@ -104,4 +106,12 @@ void wallet_confirm_utxos(struct wallet *w, const struct utxo **utxos);
bool wallet_can_spend(struct wallet *w, const u8 *script,
u32 *index, bool *output_is_p2sh);
/**
* wallet_get_newindex - get a new index from the wallet.
* @ld: (in) lightning daemon
*
* Returns -1 on error (key exhaustion).
*/
s64 wallet_get_newindex(struct lightningd *ld);
#endif /* WALLET_WALLET_H */

14
wallet/walletrpc.c
View file

@ -161,10 +161,7 @@ static void json_withdraw(struct command *cmd,
if (withdraw->changesatoshi <= 546)
withdraw->changesatoshi = 0;
withdraw->change_key_index =
db_get_intvar(ld->wallet->db, "bip32_max_index", 0) + 1;
db_set_intvar(ld->wallet->db, "bip32_max_index",
withdraw->change_key_index);
withdraw->change_key_index = wallet_get_newindex(ld);
utxos = from_utxoptr_arr(withdraw, withdraw->utxos);
u8 *msg = towire_hsmctl_sign_withdrawal(cmd,
@ -238,14 +235,15 @@ static void json_newaddr(struct command *cmd,
struct ripemd160 p2sh;
struct pubkey pubkey;
u8 *redeemscript;
u64 bip32_max_index = db_get_intvar(ld->wallet->db, "bip32_max_index", 0);
s64 keyidx;
if (bip32_max_index == BIP32_INITIAL_HARDENED_CHILD) {
keyidx = wallet_get_newindex(ld);
if (keyidx < 0) {
command_fail(cmd, "Keys exhausted ");
return;
}
if (bip32_key_from_parent(ld->bip32_base, bip32_max_index,
if (bip32_key_from_parent(ld->bip32_base, keyidx,
BIP32_FLAG_KEY_PUBLIC, &ext) != WALLY_OK) {
command_fail(cmd, "Keys generation failure");
return;
@ -261,8 +259,6 @@ static void json_newaddr(struct command *cmd,
sha256(&h, redeemscript, tal_count(redeemscript));
ripemd160(&p2sh, h.u.u8, sizeof(h));
db_set_intvar(ld->wallet->db, "bip32_max_index", bip32_max_index + 1);
json_object_start(response, NULL);
json_add_string(response, "address",
p2sh_to_base58(cmd, cmd->dstate->testnet, &p2sh));