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daemon: add pending input queue.

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You can't re-enter the state machine from a callback, so this allows you
to queue an input for when it returns.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2016-05-03 11:02:20 +09:30
parent c94c495257
commit 33a477d65d
2 changed files with 31 additions and 1 deletions
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27
daemon/peer.c
View File

@ -50,6 +50,12 @@ struct pending_cmd {
void *arg;
};
struct pending_input {
struct list_node list;
enum state_input input;
union input idata;
};
static struct peer *find_peer(struct lightningd_state *dstate,
const char *buffer,
jsmntok_t *peeridtok)
@ -210,6 +216,18 @@ static void queue_cmd_(struct peer *peer,
try_command(peer);
};
static void UNNEEDED queue_input(struct peer *peer,
enum state_input input,
const union input *idata)
{
struct pending_input *pend = tal(peer, struct pending_input);
pend->input = input;
if (idata)
pend->idata = *idata;
list_add_tail(&peer->pending_input, &pend->list);
}
/* All unrevoked commit txs must have no HTLCs in them. */
bool committed_to_htlcs(const struct peer *peer)
{
@ -244,6 +262,8 @@ static void state_event(struct peer *peer,
const enum state_input input,
const union input *idata)
{
struct pending_input *pend;
state_single(peer, input, idata);
if (peer->cleared != INPUT_NONE && !committed_to_htlcs(peer)) {
@ -252,6 +272,12 @@ static void state_event(struct peer *peer,
state_single(peer, all_done, NULL);
}
pend = list_pop(&peer->pending_input, struct pending_input, list);
if (pend) {
state_event(peer, pend->input, &pend->idata);
tal_free(pend);
}
try_command(peer);
}
@ -394,6 +420,7 @@ static struct peer *new_peer(struct lightningd_state *dstate,
peer->outpkt = tal_arr(peer, struct out_pkt, 0);
peer->curr_cmd.cmd = INPUT_NONE;
list_head_init(&peer->pending_cmd);
list_head_init(&peer->pending_input);
peer->commit_tx_counter = 0;
peer->close_watch_timeout = NULL;
peer->anchor.watches = NULL;

5
daemon/peer.h
View File

@ -119,9 +119,12 @@ struct peer {
struct command *jsoncmd;
} curr_cmd;
/* Pending inputs. */
struct list_head pending_input;
/* Pending commands. */
struct list_head pending_cmd;
/* Global state. */
struct lightningd_state *dstate;