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plugin: simplify hooks calling methods, and make lifetime requirements explicit.

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They callback must take ownership of the payload (almost all do, but
now it's explicit).

And since the payload and cb_arg arguments to plugin_hook_call_() are
always identical, make them a single parameter.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2020-04-15 19:50:41 +09:30
parent 1e34d8989d
commit 9aedb0c61f
11 changed files with 44 additions and 49 deletions
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7
lightningd/invoice.c
View File

@ -231,7 +231,7 @@ static const u8 *hook_gives_failmsg(const tal_t *ctx,
}
static void
invoice_payment_hook_cb(struct invoice_payment_hook_payload *payload,
invoice_payment_hook_cb(struct invoice_payment_hook_payload *payload STEALS,
const char *buffer,
const jsmntok_t *toks)
{
@ -281,7 +281,6 @@ invoice_payment_hook_cb(struct invoice_payment_hook_payload *payload,
REGISTER_PLUGIN_HOOK(invoice_payment,
PLUGIN_HOOK_SINGLE,
invoice_payment_hook_cb,
struct invoice_payment_hook_payload *,
invoice_payment_serialize,
struct invoice_payment_hook_payload *);
@ -360,7 +359,7 @@ void invoice_try_pay(struct lightningd *ld,
{
struct invoice_payment_hook_payload *payload;
payload = tal(ld, struct invoice_payment_hook_payload);
payload = tal(NULL, struct invoice_payment_hook_payload);
payload->ld = ld;
payload->label = tal_steal(payload, details->label);
payload->msat = set->so_far;
@ -368,7 +367,7 @@ void invoice_try_pay(struct lightningd *ld,
payload->set = set;
tal_add_destructor2(set, invoice_payload_remove_set, payload);
plugin_hook_call_invoice_payment(ld, payload, payload);
plugin_hook_call_invoice_payment(ld, payload);
}
static bool hsm_sign_b11(const u5 *u5bytes,

11
lightningd/jsonrpc.c
View File

@ -29,6 +29,7 @@
#include <common/memleak.h>
#include <common/param.h>
#include <common/timeout.h>
#include <common/utils.h>
#include <common/version.h>
#include <common/wireaddr.h>
#include <errno.h>
@ -676,13 +677,16 @@ fail:
}
static void
rpc_command_hook_callback(struct rpc_command_hook_payload *p,
rpc_command_hook_callback(struct rpc_command_hook_payload *p STEALS,
const char *buffer, const jsmntok_t *resulttok)
{
const jsmntok_t *tok, *params, *custom_return;
const jsmntok_t *innerresulttok;
struct json_stream *response;
/* Free payload with cmd */
tal_steal(p->cmd, p);
params = json_get_member(p->buffer, p->request, "params");
/* If no plugin registered, just continue command execution. Same if
@ -767,13 +771,12 @@ rpc_command_hook_callback(struct rpc_command_hook_payload *p,
REGISTER_PLUGIN_HOOK(rpc_command, PLUGIN_HOOK_SINGLE,
rpc_command_hook_callback,
struct rpc_command_hook_payload *,
rpc_command_hook_serialize,
struct rpc_command_hook_payload *);
static void call_rpc_command_hook(struct rpc_command_hook_payload *p)
{
plugin_hook_call_rpc_command(p->cmd->ld, p, p);
plugin_hook_call_rpc_command(p->cmd->ld, p);
}
/* We return struct command_result so command_fail return value has a natural
@ -842,7 +845,7 @@ parse_request(struct json_connection *jcon, const jsmntok_t tok[])
jcon->buffer + method->start);
}
rpc_hook = tal(c, struct rpc_command_hook_payload);
rpc_hook = tal(NULL, struct rpc_command_hook_payload);
rpc_hook->cmd = c;
/* Duplicate since we might outlive the connection */
rpc_hook->buffer = tal_dup_talarr(rpc_hook, char, jcon->buffer);

5
lightningd/onion_message.c
View File

@ -41,7 +41,7 @@ onion_message_serialize(struct onion_message_hook_payload *payload,
}
static void
onion_message_hook_cb(struct onion_message_hook_payload *payload,
onion_message_hook_cb(struct onion_message_hook_payload *payload STEALS,
const char *buffer,
const jsmntok_t *toks)
{
@ -53,7 +53,6 @@ onion_message_hook_cb(struct onion_message_hook_payload *payload,
REGISTER_PLUGIN_HOOK(onion_message,
PLUGIN_HOOK_CHAIN,
onion_message_hook_cb,
struct onion_message_hook_payload *,
onion_message_serialize,
struct onion_message_hook_payload *);
@ -112,7 +111,7 @@ void handle_onionmsg_to_us(struct channel *channel, const u8 *msg)
log_debug(channel->log, "Got onionmsg%s%s",
payload->reply_blinding ? " reply_blinding": "",
payload->reply_path ? " reply_path": "");
plugin_hook_call_onion_message(ld, payload, payload);
plugin_hook_call_onion_message(ld, payload);
}
void handle_onionmsg_forward(struct channel *channel, const u8 *msg)

7
lightningd/opening_control.c
View File

@ -754,7 +754,7 @@ static void openchannel_payload_remove_openingd(struct subd *openingd,
payload->openingd = NULL;
}
static void openchannel_hook_cb(struct openchannel_hook_payload *payload,
static void openchannel_hook_cb(struct openchannel_hook_payload *payload STEALS,
const char *buffer,
const jsmntok_t *toks)
{
@ -829,7 +829,6 @@ static void openchannel_hook_cb(struct openchannel_hook_payload *payload,
REGISTER_PLUGIN_HOOK(openchannel,
PLUGIN_HOOK_SINGLE,
openchannel_hook_cb,
struct openchannel_hook_payload *,
openchannel_hook_serialize,
struct openchannel_hook_payload *);
@ -847,7 +846,7 @@ static void opening_got_offer(struct subd *openingd,
return;
}
payload = tal(openingd->ld, struct openchannel_hook_payload);
payload = tal(openingd, struct openchannel_hook_payload);
payload->openingd = openingd;
if (!fromwire_opening_got_offer(payload, msg,
&payload->funding_satoshis,
@ -868,7 +867,7 @@ static void opening_got_offer(struct subd *openingd,
}
tal_add_destructor2(openingd, openchannel_payload_remove_openingd, payload);
plugin_hook_call_openchannel(openingd->ld, payload, payload);
plugin_hook_call_openchannel(openingd->ld, payload);
}
static unsigned int openingd_msg(struct subd *openingd,

14
lightningd/peer_control.c
View File

@ -860,7 +860,7 @@ peer_connected_serialize(struct peer_connected_hook_payload *payload,
}
static void
peer_connected_hook_cb(struct peer_connected_hook_payload *payload,
peer_connected_hook_cb(struct peer_connected_hook_payload *payload STEALS,
const char *buffer,
const jsmntok_t *toks)
{
@ -974,7 +974,6 @@ send_error:
REGISTER_PLUGIN_HOOK(peer_connected, PLUGIN_HOOK_SINGLE,
peer_connected_hook_cb,
struct peer_connected_hook_payload *,
peer_connected_serialize,
struct peer_connected_hook_payload *);
@ -1018,7 +1017,7 @@ void peer_connected(struct lightningd *ld, const u8 *msg,
assert(!peer->uncommitted_channel);
hook_payload->channel = peer_active_channel(peer);
plugin_hook_call_peer_connected(ld, hook_payload, hook_payload);
plugin_hook_call_peer_connected(ld, hook_payload);
}
/* FIXME: Unify our watch code so we get notified by txout, instead, like
@ -2297,7 +2296,7 @@ struct custommsg_payload {
const u8 *msg;
};
static void custommsg_callback(struct custommsg_payload *payload,
static void custommsg_callback(struct custommsg_payload *payload STEALS,
const char *buffer, const jsmntok_t *toks)
{
tal_free(payload);
@ -2310,8 +2309,9 @@ static void custommsg_payload_serialize(struct custommsg_payload *payload,
json_add_node_id(stream, "peer_id", &payload->peer_id);
}
REGISTER_PLUGIN_HOOK(custommsg, PLUGIN_HOOK_SINGLE, custommsg_callback,
struct custommsg_payload *, custommsg_payload_serialize,
REGISTER_PLUGIN_HOOK(custommsg, PLUGIN_HOOK_SINGLE,
custommsg_callback,
custommsg_payload_serialize,
struct custommsg_payload *);
void handle_custommsg_in(struct lightningd *ld, const struct node_id *peer_id,
@ -2329,7 +2329,7 @@ void handle_custommsg_in(struct lightningd *ld, const struct node_id *peer_id,
p->peer_id = *peer_id;
p->msg = tal_steal(p, custommsg);
plugin_hook_call_custommsg(ld, p, p);
plugin_hook_call_custommsg(ld, p);
}
static struct command_result *json_sendcustommsg(struct command *cmd,

7
lightningd/peer_htlcs.c
View File

@ -976,7 +976,7 @@ static void htlc_accepted_hook_serialize(struct htlc_accepted_hook_payload *p,
* Callback when a plugin answers to the htlc_accepted hook
*/
static void
htlc_accepted_hook_callback(struct htlc_accepted_hook_payload *request,
htlc_accepted_hook_callback(struct htlc_accepted_hook_payload *request STEALS,
const char *buffer, const jsmntok_t *toks)
{
struct route_step *rs = request->route_step;
@ -1027,7 +1027,6 @@ htlc_accepted_hook_callback(struct htlc_accepted_hook_payload *request,
REGISTER_PLUGIN_HOOK(htlc_accepted, PLUGIN_HOOK_CHAIN,
htlc_accepted_hook_callback,
struct htlc_accepted_hook_payload *,
htlc_accepted_hook_serialize,
struct htlc_accepted_hook_payload *);
@ -1160,7 +1159,7 @@ static bool peer_accepted_htlc(const tal_t *ctx,
goto fail;
}
hook_payload = tal(hin, struct htlc_accepted_hook_payload);
hook_payload = tal(NULL, struct htlc_accepted_hook_payload);
hook_payload->route_step = tal_steal(hook_payload, rs);
hook_payload->payload = onion_decode(hook_payload, rs,
@ -1186,7 +1185,7 @@ static bool peer_accepted_htlc(const tal_t *ctx,
#endif
hook_payload->next_blinding = NULL;
plugin_hook_call_htlc_accepted(ld, hook_payload, hook_payload);
plugin_hook_call_htlc_accepted(ld, hook_payload);
/* Falling through here is ok, after all the HTLC locked */
return true;

8
lightningd/plugin_hook.c
View File

@ -14,7 +14,6 @@ struct plugin_hook_request {
struct plugin *plugin;
const struct plugin_hook *hook;
void *cb_arg;
void *payload;
struct db *db;
struct lightningd *ld;
};
@ -221,13 +220,13 @@ static void plugin_hook_call_next(struct plugin_hook_request *ph_req)
plugin_get_log(ph_req->plugin),
plugin_hook_callback, ph_req);
hook->serialize_payload(ph_req->payload, req->stream);
hook->serialize_payload(ph_req->cb_arg, req->stream);
jsonrpc_request_end(req);
plugin_request_send(ph_req->plugin, req);
}
void plugin_hook_call_(struct lightningd *ld, const struct plugin_hook *hook,
void *payload, void *cb_arg)
tal_t *cb_arg STEALS)
{
struct plugin_hook_request *ph_req;
struct plugin_hook_call_link *link;
@ -239,9 +238,8 @@ void plugin_hook_call_(struct lightningd *ld, const struct plugin_hook *hook,
* to eventually to inspect in-flight requests. */
ph_req = notleak(tal(hook->plugins, struct plugin_hook_request));
ph_req->hook = hook;
ph_req->cb_arg = cb_arg;
ph_req->cb_arg = tal_steal(ph_req, cb_arg);
ph_req->db = ld->wallet->db;
ph_req->payload = tal_steal(ph_req, payload);
ph_req->ld = ld;
list_head_init(&ph_req->call_chain);

28
lightningd/plugin_hook.h
View File

@ -28,13 +28,14 @@
* delivery to the plugin, and from a JSON-object to the internal
* representation:
*
* - `serialize_payload` which takes a payload of type `payload_type`
* - `serialize_payload` which takes a payload of type `cb_arg_type`
* and serializes it into the given `json_stream`. `
*
* - `response_cb` is called once the plugin has responded (or with
* buffer == NULL if there's no plugin). In addition an arbitrary
* additional argument of type `cb_arg_type` can be passed along
* that may contain any additional context necessary.
* that may contain any additional context necessary. It must free
* or otherwise take ownership of the cb_arg_type argument.
*
*
* To make hook invocations easier, each hook registered with
@ -69,7 +70,7 @@ AUTODATA_TYPE(hooks, struct plugin_hook);
* wrappers generated by the `PLUGIN_HOOK_REGISTER` macro.
*/
void plugin_hook_call_(struct lightningd *ld, const struct plugin_hook *hook,
void *payload, void *cb_arg);
tal_t *cb_arg STEALS);
/* Create a small facade in from of `plugin_hook_call_` to make sure
@ -78,13 +79,11 @@ void plugin_hook_call_(struct lightningd *ld, const struct plugin_hook *hook,
* the method-name is correct for the call.
*/
/* FIXME: Find a way to avoid back-to-back declaration and definition */
#define PLUGIN_HOOK_CALL_DEF(name, payload_type, response_cb_arg_type) \
#define PLUGIN_HOOK_CALL_DEF(name, cb_arg_type) \
UNNEEDED static inline void plugin_hook_call_##name( \
struct lightningd *ld, payload_type payload, \
response_cb_arg_type cb_arg) \
struct lightningd *ld, cb_arg_type cb_arg STEALS) \
{ \
plugin_hook_call_(ld, &name##_hook_gen, (void *)payload, \
(void *)cb_arg); \
plugin_hook_call_(ld, &name##_hook_gen, cb_arg); \
}
/* Typechecked registration of a plugin hook. We check that the
@ -95,23 +94,22 @@ void plugin_hook_call_(struct lightningd *ld, const struct plugin_hook *hook,
* response_cb function accepts the deserialized response format and
* an arbitrary extra argument used to maintain context.
*/
#define REGISTER_PLUGIN_HOOK(name, type, response_cb, response_cb_arg_type, \
serialize_payload, payload_type) \
#define REGISTER_PLUGIN_HOOK(name, type, response_cb, \
serialize_payload, cb_arg_type) \
struct plugin_hook name##_hook_gen = { \
stringify(name), \
type, \
typesafe_cb_cast( \
void (*)(void *, const char *, const jsmntok_t *), \
void (*)(response_cb_arg_type, const char *, \
const jsmntok_t *), \
void (*)(void *STEALS, const char *, const jsmntok_t *), \
void (*)(cb_arg_type STEALS, const char *, const jsmntok_t *), \
response_cb), \
typesafe_cb_cast(void (*)(void *, struct json_stream *), \
void (*)(payload_type, struct json_stream *), \
void (*)(cb_arg_type, struct json_stream *), \
serialize_payload), \
NULL, /* .plugins */ \
}; \
AUTODATA(hooks, &name##_hook_gen); \
PLUGIN_HOOK_CALL_DEF(name, payload_type, response_cb_arg_type);
PLUGIN_HOOK_CALL_DEF(name, cb_arg_type)
bool plugin_hook_register(struct plugin *plugin, const char *method);

2
lightningd/test/run-invoice-select-inchan.c
View File

@ -375,7 +375,7 @@ void per_peer_state_set_fds(struct per_peer_state *pps UNNEEDED,
{ fprintf(stderr, "per_peer_state_set_fds called!\n"); abort(); }
/* Generated stub for plugin_hook_call_ */
void plugin_hook_call_(struct lightningd *ld UNNEEDED, const struct plugin_hook *hook UNNEEDED,
void *payload UNNEEDED, void *cb_arg UNNEEDED)
tal_t *cb_arg UNNEEDED)
{ fprintf(stderr, "plugin_hook_call_ called!\n"); abort(); }
/* Generated stub for subd_release_channel */
void subd_release_channel(struct subd *owner UNNEEDED, void *channel UNNEEDED)

2
lightningd/test/run-jsonrpc.c
View File

@ -96,7 +96,7 @@ struct command_result *param_tok(struct command *cmd UNNEEDED, const char *name
{ fprintf(stderr, "param_tok called!\n"); abort(); }
/* Generated stub for plugin_hook_call_ */
void plugin_hook_call_(struct lightningd *ld UNNEEDED, const struct plugin_hook *hook UNNEEDED,
void *payload UNNEEDED, void *cb_arg UNNEEDED)
tal_t *cb_arg UNNEEDED)
{ fprintf(stderr, "plugin_hook_call_ called!\n"); abort(); }
/* AUTOGENERATED MOCKS END */

2
wallet/test/run-wallet.c
View File

@ -547,7 +547,7 @@ void per_peer_state_set_fds(struct per_peer_state *pps UNNEEDED,
{ fprintf(stderr, "per_peer_state_set_fds called!\n"); abort(); }
/* Generated stub for plugin_hook_call_ */
void plugin_hook_call_(struct lightningd *ld UNNEEDED, const struct plugin_hook *hook UNNEEDED,
void *payload UNNEEDED, void *cb_arg UNNEEDED)
tal_t *cb_arg UNNEEDED)
{ fprintf(stderr, "plugin_hook_call_ called!\n"); abort(); }
/* Generated stub for process_onionpacket */
struct route_step *process_onionpacket(