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#include <common/memleak.h>
#include <lightningd/jsonrpc.h>
#include <lightningd/plugin_hook.h>
#include <wallet/db.h>
/* Struct containing all the information needed to deserialize and
* dispatch an eventual plugin_hook response. */
struct plugin_hook_request {
const struct plugin_hook *hook;
void *cb_arg;
struct db *db;
};
static struct plugin_hook *plugin_hook_by_name(const char *name)
{
static struct plugin_hook **hooks = NULL;
static size_t num_hooks;
if (!hooks)
hooks = autodata_get(hooks, &num_hooks);
for (size_t i=0; i<num_hooks; i++)
if (streq(hooks[i]->name, name))
return hooks[i];
return NULL;
}
bool plugin_hook_register(struct plugin *plugin, const char *method)
{
struct plugin_hook *hook = plugin_hook_by_name(method);
if (!hook) {
/* No such hook name registered */
return false;
} else if (hook->plugin != NULL) {
/* Another plugin already registered for this name */
return false;
}
hook->plugin = plugin;
return true;
}
/* FIXME(cdecker): Remove dummy hook, once we have a real one */
REGISTER_PLUGIN_HOOK(hello, NULL, void *, NULL, void *, NULL, void *);
/**
* Callback to be passed to the jsonrpc_request.
*
* Unbundles the arguments, deserializes the response and dispatches
* it to the hook callback.
*/
static void plugin_hook_callback(const char *buffer, const jsmntok_t *toks,
const jsmntok_t *idtok,
struct plugin_hook_request *r)
{
const jsmntok_t *resulttok = json_get_member(buffer, toks, "result");
void *response = r->hook->deserialize_response(r, buffer, resulttok);
db_begin_transaction(r->db);
r->hook->response_cb(r->cb_arg, response);
db_commit_transaction(r->db);
tal_free(r);
}
void plugin_hook_call_(struct lightningd *ld, const struct plugin_hook *hook,
void *payload, void *cb_arg)
{
struct jsonrpc_request *req;
struct plugin_hook_request *ph_req;
if (hook->plugin) {
/* If we have a plugin that has registered for this
* hook, serialize and call it */
/* FIXME: technically this is a leak, but we don't
* currently have a list to store these. We might want
* to eventually to inspect in-flight requests. */
ph_req = notleak(tal(hook->plugin, struct plugin_hook_request));
req = jsonrpc_request_start(NULL, hook->name,
plugin_hook_callback, ph_req);
ph_req->hook = hook;
ph_req->cb_arg = cb_arg;
ph_req->db = ld->wallet->db;
hook->serialize_payload(payload, req->stream);
jsonrpc_request_end(req);
plugin_request_send(hook->plugin, req);
} else {
/* If no plugin has registered for this hook, just
* call the callback with a NULL result. Saves us the
* roundtrip to the serializer and deserializer. If we
* were expecting a default response it should have
* been part of the `cb_arg`. */
hook->response_cb(cb_arg, NULL);
}
}