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lightningd: add support for filters on "rpc_command" hook.

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Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Changelog-Added: Plugins: the `rpc_command` hook can now specify a "filter" on what commands it is interested in.
This commit is contained in:
Rusty Russell
2025-11-20 12:07:13 +10:30
parent d76a9050ad
commit d9d82ac5bd
2 changed files with 9 additions and 7 deletions
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3
doc/developers-guide/plugin-development/hooks.md
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@@ -506,7 +506,8 @@ The `htlc_accepted` hook is a chained hook, i.e., multiple plugins can register
### `rpc_command`
The `rpc_command` hook allows a plugin to take over any RPC command. It sends the received JSON-RPC request (for any method!) to the registered plugin,
The `rpc_command` hook allows a plugin to take over any RPC command. It sends the received JSON-RPC request to the registered plugin. You can optionally specify a "filters" array, containing the command names you want to intercept: without this, all commands will be sent to this hook.
```json
{

13
lightningd/jsonrpc.c
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@@ -1003,11 +1003,11 @@ log_error_and_skip:
return true;
}
REGISTER_PLUGIN_HOOK(rpc_command,
rpc_command_hook_callback,
rpc_command_hook_final,
rpc_command_hook_serialize,
struct rpc_command_hook_payload *);
REGISTER_PLUGIN_HOOK_STRFILTER(rpc_command,
rpc_command_hook_callback,
rpc_command_hook_final,
rpc_command_hook_serialize,
struct rpc_command_hook_payload *);
/* We return struct command_result so command_fail return value has a natural
* sink; we don't actually use the result. */
@@ -1124,7 +1124,8 @@ parse_request(struct json_connection *jcon,
trace_span_start("lightningd/jsonrpc", &c);
trace_span_tag(&c, "method", c->json_cmd->name);
completed = plugin_hook_call_rpc_command(jcon->ld, c->id, rpc_hook);
/* They can filter by command name */
completed = plugin_hook_call_rpc_command(jcon->ld, c->json_cmd->name, c->id, rpc_hook);
trace_span_end(&c);
/* If it's deferred, mark it (otherwise, it's completed) */