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#include <ccan/opt/opt.h>
#include <lightningd/options.h>
#include <lightningd/plugin_control.h>
#include <lightningd/plugin_hook.h>
#include <sys/stat.h>
#include <sys/types.h>
/* A dummy structure used to give multiple arguments to callbacks. */
struct dynamic_plugin {
struct plugin *plugin;
struct command *cmd;
};
/**
* Returned by all subcommands on success.
*/
static struct command_result *plugin_dynamic_list_plugins(struct command *cmd,
const struct plugins *plugins)
{
struct json_stream *response;
const struct plugin *p;
response = json_stream_success(cmd);
json_array_start(response, "plugins");
list_for_each(&plugins->plugins, p, list) {
json_object_start(response, NULL);
json_add_string(response, "name", p->cmd);
json_add_bool(response, "active",
p->plugin_state == INIT_COMPLETE);
json_object_end(response);
}
json_array_end(response);
return command_success(cmd, response);
}
struct command_result *plugin_cmd_killed(struct command *cmd,
struct plugin *plugin, const char *msg)
{
return command_fail(cmd, PLUGIN_ERROR, "%s: %s", plugin->cmd, msg);
}
struct command_result *plugin_cmd_succeeded(struct command *cmd,
struct plugin *plugin)
{
return plugin_dynamic_list_plugins(cmd, plugin->plugins);
}
struct command_result *plugin_cmd_all_complete(struct plugins *plugins,
struct command *cmd)
{
return plugin_dynamic_list_plugins(cmd, plugins);
}
/**
* Called when trying to start a plugin through RPC, it starts the plugin and
* will give a result 60 seconds later at the most (once init completes).
*/
static struct command_result *
plugin_dynamic_start(struct command *cmd, const char *plugin_path)
{
struct plugin *p = plugin_register(cmd->ld->plugins, plugin_path, cmd, false);
const char *err;
if (!p)
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"%s: already registered",
plugin_path);
/* This will come back via plugin_cmd_killed or plugin_cmd_succeeded */
err = plugin_send_getmanifest(p);
if (err)
return command_fail(cmd, PLUGIN_ERROR,
"%s: %s",
plugin_path, err);
return command_still_pending(cmd);
}
/**
* Called when trying to start a plugin directory through RPC, it registers
* all contained plugins recursively and then starts them.
*/
static struct command_result *
plugin_dynamic_startdir(struct command *cmd, const char *dir_path)
{
const char *err;
struct command_result *res;
err = add_plugin_dir(cmd->ld->plugins, dir_path, false);
if (err)
return command_fail(cmd, JSONRPC2_INVALID_PARAMS, "%s", err);
/* If none added, this calls plugin_cmd_all_complete immediately */
res = plugin_register_all_complete(cmd->ld, cmd);
if (res)
return res;
plugins_send_getmanifest(cmd->ld->plugins);
return command_still_pending(cmd);
}
static struct command_result *
plugin_dynamic_stop(struct command *cmd, const char *plugin_name)
{
struct plugin *p;
struct json_stream *response;
list_for_each(&cmd->ld->plugins->plugins, p, list) {
if (plugin_paths_match(p->cmd, plugin_name)) {
if (!p->dynamic)
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"%s cannot be managed when "
"lightningd is up",
plugin_name);
plugin_kill(p, "stopped by lightningd via RPC");
response = json_stream_success(cmd);
json_add_string(response, "result",
take(tal_fmt(NULL, "Successfully stopped %s.",
plugin_name)));
return command_success(cmd, response);
}
}
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"Could not find plugin %s", plugin_name);
}
/**
* Look for additions in the default plugin directory.
*/
static struct command_result *
plugin_dynamic_rescan_plugins(struct command *cmd)
{
struct command_result *res;
/* This will not fail on "already registered" error. */
plugins_add_default_dir(cmd->ld->plugins);
/* If none added, this calls plugin_cmd_all_complete immediately */
res = plugin_register_all_complete(cmd->ld, cmd);
if (res)
return res;
return command_still_pending(cmd);
}
/**
* A plugin command which permits to control plugins without restarting
* lightningd. It takes a subcommand, and an optional subcommand parameter.
*/
static struct command_result *json_plugin_control(struct command *cmd,
const char *buffer,
const jsmntok_t *obj UNNEEDED,
const jsmntok_t *params)
{
const char *subcmd;
subcmd = param_subcommand(cmd, buffer, params,
"start", "stop", "startdir",
"rescan", "list", NULL);
if (!subcmd)
return command_param_failed();
if (streq(subcmd, "stop")) {
const char *plugin_name;
if (!param(cmd, buffer, params,
p_req("subcommand", param_ignore, cmd),
p_req("plugin", param_string, &plugin_name),
NULL))
return command_param_failed();
return plugin_dynamic_stop(cmd, plugin_name);
} else if (streq(subcmd, "start")) {
const char *plugin_path;
if (!param(cmd, buffer, params,
p_req("subcommand", param_ignore, cmd),
p_req("plugin", param_string, &plugin_path),
NULL))
return command_param_failed();
if (access(plugin_path, X_OK) == 0)
return plugin_dynamic_start(cmd, plugin_path);
else
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"%s is not executable: %s",
plugin_path, strerror(errno));
} else if (streq(subcmd, "startdir")) {
const char *dir_path;
if (!param(cmd, buffer, params,
p_req("subcommand", param_ignore, cmd),
p_req("directory", param_string, &dir_path),
NULL))
return command_param_failed();
if (access(dir_path, F_OK) == 0)
return plugin_dynamic_startdir(cmd, dir_path);
else
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"Could not open %s", dir_path);
} else if (streq(subcmd, "rescan")) {
if (!param(cmd, buffer, params,
p_req("subcommand", param_ignore, cmd),
NULL))
return command_param_failed();
return plugin_dynamic_rescan_plugins(cmd);
} else if (streq(subcmd, "list")) {
if (!param(cmd, buffer, params,
p_req("subcommand", param_ignore, cmd),
NULL))
return command_param_failed();
return plugin_dynamic_list_plugins(cmd, cmd->ld->plugins);
}
/* subcmd must be one of the above: param_subcommand checked it! */
abort();
}
static const struct json_command plugin_control_command = {
"plugin",
"plugin",
json_plugin_control,
"Control plugins (start, stop, startdir, rescan, list)",
.verbose = "Usage :\n"
"plugin start /path/to/a/plugin\n"
" adds a new plugin to c-lightning\n"
"plugin stop plugin_name\n"
" stops an already registered plugin\n"
"plugin startdir /path/to/a/plugin_dir/\n"
" adds a new plugin directory\n"
"plugin rescan\n"
" loads not-already-loaded plugins from the default plugins dir\n"
"plugin list\n"
" lists all active plugins\n"
"\n"
};
AUTODATA(json_command, &plugin_control_command);