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plugin.c
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#include "config.h"
#include <ccan/array_size/array_size.h>
#include <ccan/ccan/tal/grab_file/grab_file.h>
#include <ccan/crc32c/crc32c.h>
#include <ccan/io/io.h>
#include <ccan/mem/mem.h>
#include <ccan/opt/opt.h>
#include <ccan/pipecmd/pipecmd.h>
#include <ccan/tal/path/path.h>
#include <ccan/tal/str/str.h>
#include <ccan/utf8/utf8.h>
#include <common/configdir.h>
#include <common/features.h>
#include <common/json_command.h>
#include <common/memleak.h>
#include <common/timeout.h>
#include <common/version.h>
#include <dirent.h>
#include <errno.h>
#include <lightningd/io_loop_with_timers.h>
#include <lightningd/notification.h>
#include <lightningd/plugin.h>
#include <lightningd/plugin_control.h>
#include <lightningd/plugin_hook.h>
#include <sys/stat.h>
/* Only this file can include this generated header! */
# include <plugins/list_of_builtin_plugins_gen.h>
/* How many seconds may the plugin take to reply to the `getmanifest`
* call? This is the maximum delay to `lightningd --help` and until
* we can start the main `io_loop` to communicate with peers. If this
* hangs we can't do much, so we put an upper bound on the time we're
* willing to wait. Plugins shouldn't do any initialization in the
* `getmanifest` call anyway, that's what `init` is for. */
#define PLUGIN_MANIFEST_TIMEOUT 60
/* A simple struct associating an incoming RPC method call with the plugin
* that is handling it and the downstream jsonrpc_request. */
struct plugin_rpccall {
struct list_node list;
struct command *cmd;
struct plugin *plugin;
struct jsonrpc_request *request;
};
#if DEVELOPER
static void memleak_help_pending_requests(struct htable *memtable,
struct plugins *plugins)
{
memleak_scan_strmap(memtable, &plugins->pending_requests);
}
#endif /* DEVELOPER */
static const char *state_desc(const struct plugin *plugin)
{
switch (plugin->plugin_state) {
case UNCONFIGURED:
return "unconfigured";
case AWAITING_GETMANIFEST_RESPONSE:
return "before replying to getmanifest";
case NEEDS_INIT:
return "before we sent init";
case AWAITING_INIT_RESPONSE:
return "before replying to init";
case INIT_COMPLETE:
return "during normal operation";
}
fatal("Invalid plugin state %i for %s",
plugin->plugin_state, plugin->cmd);
}
struct plugins *plugins_new(const tal_t *ctx, struct log_book *log_book,
struct lightningd *ld)
{
struct plugins *p;
p = tal(ctx, struct plugins);
list_head_init(&p->plugins);
p->log_book = log_book;
p->log = new_log(p, log_book, NULL, "plugin-manager");
p->ld = ld;
p->startup = true;
p->plugin_cmds = tal_arr(p, struct plugin_command *, 0);
p->blacklist = tal_arr(p, const char *, 0);
p->plugin_idx = 0;
#if DEVELOPER
p->dev_builtin_plugins_unimportant = false;
#endif /* DEVELOPER */
strmap_init(&p->pending_requests);
memleak_add_helper(p, memleak_help_pending_requests);
return p;
}
/* Check that all the plugin's subscriptions are actually for known
* notification topics. Emit a warning if that's not the case, but
* don't kill the plugin. */
static void plugin_check_subscriptions(struct plugins *plugins,
struct plugin *plugin)
{
for (size_t i = 0; i < tal_count(plugin->subscriptions); i++) {
const char *topic = plugin->subscriptions[i];
if (!notifications_have_topic(plugins, topic))
log_unusual(
plugin->log,
"topic '%s' is not a known notification topic",
topic);
}
}
static bool plugins_any_in_state(const struct plugins *plugins,
enum plugin_state state)
{
const struct plugin *p;
list_for_each(&plugins->plugins, p, list) {
if (p->plugin_state == state)
return true;
}
return false;
}
static bool plugins_all_in_state(const struct plugins *plugins,
enum plugin_state state)
{
const struct plugin *p;
list_for_each(&plugins->plugins, p, list) {
if (p->plugin_state != state)
return false;
}
return true;
}
/* Once they've all replied with their manifests, we can order them. */
static void check_plugins_manifests(struct plugins *plugins)
{
struct plugin *plugin;
struct plugin **depfail;
if (plugins_any_in_state(plugins, AWAITING_GETMANIFEST_RESPONSE))
return;
/* Now things are settled, try to order hooks. */
depfail = plugin_hooks_make_ordered(tmpctx);
for (size_t i = 0; i < tal_count(depfail); i++) {
/* Only complain and free plugins! */
if (depfail[i]->plugin_state != NEEDS_INIT)
continue;
plugin_kill(depfail[i], LOG_UNUSUAL,
"Cannot meet required hook dependencies");
}
/* Check that all the subscriptions are matched with real
* topics. */
list_for_each(&plugins->plugins, plugin, list) {
plugin_check_subscriptions(plugin->plugins, plugin);
}
/* As startup, we break out once all getmanifest are returned */
if (plugins->startup) {
log_debug(plugins->ld->log, "io_break: %s", __func__);
io_break(plugins);
} else
/* Otherwise we go straight into configuring them */
plugins_config(plugins);
}
static void check_plugins_initted(struct plugins *plugins)
{
struct plugin_command **plugin_cmds;
if (!plugins_all_in_state(plugins, INIT_COMPLETE))
return;
/* Clear commands first, in case callbacks add new ones.
* Paranoia, but wouldn't that be a nasty bug to find? */
plugin_cmds = plugins->plugin_cmds;
plugins->plugin_cmds = tal_arr(plugins, struct plugin_command *, 0);
for (size_t i = 0; i < tal_count(plugin_cmds); i++)
plugin_cmd_all_complete(plugins, plugin_cmds[i]);
tal_free(plugin_cmds);
if (plugins->startup)
io_break(plugins);
}
struct command_result *plugin_register_all_complete(struct lightningd *ld,
struct plugin_command *pcmd)
{
if (plugins_all_in_state(ld->plugins, INIT_COMPLETE))
return plugin_cmd_all_complete(ld->plugins, pcmd);
tal_arr_expand(&ld->plugins->plugin_cmds, pcmd);
return NULL;
}
static void destroy_plugin(struct plugin *p)
{
struct plugin_rpccall *call;
list_del(&p->list);
/* Terminate all pending RPC calls with an error. */
list_for_each(&p->pending_rpccalls, call, list) {
was_pending(command_fail(
call->cmd, PLUGIN_TERMINATED,
"Plugin terminated before replying to RPC call."));
}
/* Reset, so calls below don't try to fail it again! */
list_head_init(&p->pending_rpccalls);
/* If this was last one manifests were waiting for, handle deps */
if (p->plugin_state == AWAITING_GETMANIFEST_RESPONSE)
check_plugins_manifests(p->plugins);
/* Daemon shutdown overrules plugin's importance; aborts init checks */
if (p->plugins->ld->state == LD_STATE_SHUTDOWN) {
/* But return if this was the last plugin! */
if (list_empty(&p->plugins->plugins)) {
log_debug(p->plugins->ld->log, "io_break: %s", __func__);
io_break(destroy_plugin);
}
return;
}
/* If this was the last one init was waiting for, handle cmd replies */
if (p->plugin_state == AWAITING_INIT_RESPONSE)
check_plugins_initted(p->plugins);
/* Now check if the dying plugin is important. */
if (p->important) {
log_broken(p->log,
"Plugin marked as important, "
"shutting down lightningd!");
lightningd_exit(p->plugins->ld, 1);
}
}
static u32 file_checksum(struct lightningd *ld, const char *path)
{
char *content;
if (IFDEV(ld->dev_no_plugin_checksum, false))
return 0;
content = grab_file(tmpctx, path);
if (content == NULL) return 0;
return crc32c(0, content, tal_count(content));
}
struct plugin *plugin_register(struct plugins *plugins, const char* path TAKES,
struct plugin_command *start_cmd, bool important,
const char *parambuf STEALS,
const jsmntok_t *params STEALS)
{
struct plugin *p, *p_temp;
char* abspath;
u32 chksum;
abspath = path_canon(tmpctx, path);
if (!abspath) {
return NULL;
}
/* Don't register an already registered plugin */
list_for_each(&plugins->plugins, p_temp, list) {
if (streq(abspath, p_temp->cmd)) {
/* If added as "important", upgrade to "important". */
if (important)
p_temp->important = true;
/* stop and restart plugin on different checksum */
chksum = file_checksum(plugins->ld, path);
if (p_temp->checksum != chksum && !p_temp->important) {
plugin_kill(p_temp, LOG_INFORM,
"Plugin changed, needs restart.");
break;
}
if (taken(path))
tal_free(path);
return NULL;
}
}
p = tal(plugins, struct plugin);
p->plugins = plugins;
p->cmd = tal_steal(p, abspath);
p->checksum = file_checksum(plugins->ld, p->cmd);
p->shortname = path_basename(p, p->cmd);
p->start_cmd = start_cmd;
p->plugin_state = UNCONFIGURED;
p->js_arr = tal_arr(p, struct json_stream *, 0);
p->used = 0;
p->notification_topics = tal_arr(p, const char *, 0);
p->subscriptions = NULL;
p->dynamic = false;
p->non_numeric_ids = false;
p->index = plugins->plugin_idx++;
p->log = new_log(p, plugins->log_book, NULL, "plugin-%s", p->shortname);
p->methods = tal_arr(p, const char *, 0);
list_head_init(&p->plugin_opts);
list_add_tail(&plugins->plugins, &p->list);
tal_add_destructor(p, destroy_plugin);
list_head_init(&p->pending_rpccalls);
p->important = important;
p->parambuf = tal_steal(p, parambuf);
p->params = tal_steal(p, params);
return p;
}
bool plugin_paths_match(const char *cmd, const char *name)
{
if (strchr(name, PATH_SEP)) {
const char *cmd_canon, *name_canon;
if (streq(cmd, name))
return true;
/* These return NULL path doesn't exist */
cmd_canon = path_canon(tmpctx, cmd);
name_canon = path_canon(tmpctx, name);
return cmd_canon && name_canon && streq(name_canon, cmd_canon);
} else {
/* No path separator means a basename match. */
const char *base = path_basename(tmpctx, cmd);
return streq(base, name);
}
}
void plugin_blacklist(struct plugins *plugins, const char *name)
{
struct plugin *p, *next;
log_debug(plugins->log, "blacklist for %s", name);
list_for_each_safe(&plugins->plugins, p, next, list) {
if (plugin_paths_match(p->cmd, name)) {
log_info(plugins->log, "%s: disabled via disable-plugin",
p->cmd);
list_del_from(&plugins->plugins, &p->list);
/* disable-plugin overrides important-plugin. */
p->important = false;
tal_free(p);
}
}
tal_arr_expand(&plugins->blacklist,
tal_strdup(plugins->blacklist, name));
}
bool plugin_blacklisted(struct plugins *plugins, const char *name)
{
for (size_t i = 0; i < tal_count(plugins->blacklist); i++)
if (plugin_paths_match(name, plugins->blacklist[i]))
return true;
return false;
}
void plugin_kill(struct plugin *plugin, enum log_level loglevel,
const char *fmt, ...)
{
va_list ap;
const char *msg;
va_start(ap, fmt);
msg = tal_vfmt(tmpctx, fmt, ap);
va_end(ap);
log_(plugin->log, loglevel,
NULL, loglevel >= LOG_UNUSUAL,
"Killing plugin: %s", msg);
kill(plugin->pid, SIGKILL);
if (plugin->start_cmd) {
plugin_cmd_killed(plugin->start_cmd, plugin, msg);
plugin->start_cmd = NULL;
}
/* Don't come back when we free stdout_conn! */
io_set_finish(plugin->stdout_conn, NULL, NULL);
tal_free(plugin);
}
/**
* Send a JSON-RPC message (request or notification) to the plugin.
*/
static void plugin_send(struct plugin *plugin, struct json_stream *stream)
{
tal_steal(plugin->js_arr, stream);
tal_arr_expand(&plugin->js_arr, stream);
io_wake(plugin);
}
/* Returns the error string, or NULL */
static const char *plugin_log_handle(struct plugin *plugin,
const jsmntok_t *paramstok)
WARN_UNUSED_RESULT;
static const char *plugin_log_handle(struct plugin *plugin,
const jsmntok_t *paramstok)
{
const jsmntok_t *msgtok, *leveltok;
enum log_level level;
bool call_notifier;
msgtok = json_get_member(plugin->buffer, paramstok, "message");
leveltok = json_get_member(plugin->buffer, paramstok, "level");
if (!msgtok || msgtok->type != JSMN_STRING) {
return tal_fmt(plugin, "Log notification from plugin doesn't have "
"a string \"message\" field");
}
if (!leveltok)
level = LOG_INFORM;
else if (!log_level_parse(plugin->buffer + leveltok->start,
leveltok->end - leveltok->start,
&level)
/* FIXME: Allow io logging? */
|| level == LOG_IO_IN
|| level == LOG_IO_OUT) {
return tal_fmt(plugin,
"Unknown log-level %.*s, valid values are "
"\"debug\", \"info\", \"warn\", or \"error\".",
json_tok_full_len(leveltok),
json_tok_full(plugin->buffer, leveltok));
}
call_notifier = (level == LOG_BROKEN || level == LOG_UNUSUAL)? true : false;
/* FIXME: Let plugin specify node_id? */
log_(plugin->log, level, NULL, call_notifier, "%.*s", msgtok->end - msgtok->start,
plugin->buffer + msgtok->start);
return NULL;
}
static const char *plugin_notify_handle(struct plugin *plugin,
const jsmntok_t *methodtok,
const jsmntok_t *paramstok)
{
const jsmntok_t *idtok;
struct jsonrpc_request *request;
/* id inside params tells us which id to redirect to. */
idtok = json_get_member(plugin->buffer, paramstok, "id");
if (!idtok) {
return tal_fmt(plugin,
"JSON-RPC notify \"id\"-field is not present");
}
/* Include any "" in id */
request = strmap_getn(&plugin->plugins->pending_requests,
json_tok_full(plugin->buffer, idtok),
json_tok_full_len(idtok));
if (!request) {
return tal_fmt(
plugin,
"Received a JSON-RPC notify for non-existent request '%.*s'",
json_tok_full_len(idtok),
json_tok_full(plugin->buffer, idtok));
}
/* Ignore if they don't have a callback */
if (request->notify_cb)
request->notify_cb(plugin->buffer, methodtok, paramstok, idtok,
request->response_cb_arg);
return NULL;
}
/* Check if the plugin is allowed to send a notification of the
* specified topic, i.e., whether the plugin has announced the topic
* correctly in its manifest. */
static bool plugin_notification_allowed(const struct plugin *plugin, const char *topic)
{
for (size_t i=0; i<tal_count(plugin->notification_topics); i++)
if (streq(plugin->notification_topics[i], topic))
return true;
return false;
}
/* Returns the error string, or NULL */
static const char *plugin_notification_handle(struct plugin *plugin,
const jsmntok_t *toks)
WARN_UNUSED_RESULT;
static const char *plugin_notification_handle(struct plugin *plugin,
const jsmntok_t *toks)
{
const jsmntok_t *methtok, *paramstok;
const char *methname;
struct jsonrpc_notification *n;
methtok = json_get_member(plugin->buffer, toks, "method");
paramstok = json_get_member(plugin->buffer, toks, "params");
if (!methtok || !paramstok) {
return tal_fmt(plugin,
"Malformed JSON-RPC notification missing "
"\"method\" or \"params\": %.*s",
toks->end - toks->start,
plugin->buffer + toks->start);
}
/* Dispatch incoming notifications. This is currently limited
* to just a few method types, should this ever become
* unwieldy we can switch to the AUTODATA construction to
* register notification handlers in a variety of places. */
if (json_tok_streq(plugin->buffer, methtok, "log")) {
return plugin_log_handle(plugin, paramstok);
} else if (json_tok_streq(plugin->buffer, methtok, "message")
|| json_tok_streq(plugin->buffer, methtok, "progress")) {
return plugin_notify_handle(plugin, methtok, paramstok);
}
methname = json_strdup(tmpctx, plugin->buffer, methtok);
if (!plugin_notification_allowed(plugin, methname)) {
log_unusual(plugin->log,
"Plugin attempted to send a notification to topic "
"\"%s\" it hasn't declared in its manifest, not "
"forwarding to subscribers.",
methname);
} else if (notifications_have_topic(plugin->plugins, methname)) {
n = jsonrpc_notification_start(NULL, methname);
json_add_string(n->stream, "origin", plugin->shortname);
json_add_tok(n->stream, "payload", paramstok, plugin->buffer);
jsonrpc_notification_end(n);
plugins_notify(plugin->plugins, take(n));
}
return NULL;
}
struct plugin_destroyed {
const struct plugin *plugin;
};
static void mark_plugin_destroyed(const struct plugin *unused,
struct plugin_destroyed *pd)
{
pd->plugin = NULL;
}
static struct plugin_destroyed *
plugin_detect_destruction(const struct plugin *plugin)
{
struct plugin_destroyed *pd = tal(NULL, struct plugin_destroyed);
pd->plugin = plugin;
tal_add_destructor2(plugin, mark_plugin_destroyed, pd);
return pd;
}
static bool was_plugin_destroyed(struct plugin_destroyed *pd)
{
if (pd->plugin) {
tal_del_destructor2(pd->plugin, mark_plugin_destroyed, pd);
tal_free(pd);
return false;
}
tal_free(pd);
return true;
}
/* Returns the error string, or NULL */
static const char *plugin_response_handle(struct plugin *plugin,
const jsmntok_t *toks,
const jsmntok_t *idtok)
WARN_UNUSED_RESULT;
static const char *plugin_response_handle(struct plugin *plugin,
const jsmntok_t *toks,
const jsmntok_t *idtok)
{
struct plugin_destroyed *pd;
struct jsonrpc_request *request;
request = strmap_getn(&plugin->plugins->pending_requests,
json_tok_full(plugin->buffer, idtok),
json_tok_full_len(idtok));
if (!request) {
return tal_fmt(
plugin,
"Received a JSON-RPC response for non-existent request '%.*s'",
json_tok_full_len(idtok),
json_tok_full(plugin->buffer, idtok));
}
/* We expect the request->cb to copy if needed */
pd = plugin_detect_destruction(plugin);
request->response_cb(plugin->buffer, toks, idtok, request->response_cb_arg);
/* Note that in the case of 'plugin stop' this can free request (since
* plugin is parent), so detect that case */
if (!was_plugin_destroyed(pd))
tal_free(request);
return NULL;
}
/**
* Try to parse a complete message from the plugin's buffer.
*
* Returns NULL if there was no error.
* If it can parse a JSON message, sets *@complete, and returns any error
* from the callback.
*
* If @destroyed was set, it means the plugin called plugin stop on itself.
*/
static const char *plugin_read_json_one(struct plugin *plugin,
bool *complete,
bool *destroyed)
{
const jsmntok_t *jrtok, *idtok;
struct plugin_destroyed *pd;
const char *err;
*destroyed = false;
/* Note that in the case of 'plugin stop' this can free request (since
* plugin is parent), so detect that case */
if (!json_parse_input(&plugin->parser, &plugin->toks,
plugin->buffer, plugin->used,
complete)) {
return tal_fmt(plugin,
"Failed to parse JSON response '%.*s'",
(int)plugin->used, plugin->buffer);
}
if (!*complete) {
/* We need more. */
return NULL;
}
/* Empty buffer? (eg. just whitespace). */
if (tal_count(plugin->toks) == 1) {
plugin->used = 0;
jsmn_init(&plugin->parser);
toks_reset(plugin->toks);
/* We need more. */
*complete = false;
return NULL;
}
if (plugin->toks->type != JSMN_OBJECT)
return tal_fmt(
plugin,
"JSON-RPC message is not a valid JSON object type");
jrtok = json_get_member(plugin->buffer, plugin->toks, "jsonrpc");
idtok = json_get_member(plugin->buffer, plugin->toks, "id");
if (!jrtok) {
return tal_fmt(
plugin,
"JSON-RPC message does not contain \"jsonrpc\" field");
}
pd = plugin_detect_destruction(plugin);
if (!idtok) {
/* A Notification is a Request object without an "id"
* member. A Request object that is a Notification
* signifies the Client's lack of interest in the
* corresponding Response object, and as such no
* Response object needs to be returned to the
* client. The Server MUST NOT reply to a
* Notification, including those that are within a
* batch request.
*
* https://www.jsonrpc.org/specification#notification
*/
err = plugin_notification_handle(plugin, plugin->toks);
} else {
/* When a rpc call is made, the Server MUST reply with
* a Response, except for in the case of
* Notifications. The Response is expressed as a
* single JSON Object, with the following members:
*
* - jsonrpc: A String specifying the version of the
* JSON-RPC protocol. MUST be exactly "2.0".
*
* - result: This member is REQUIRED on success. This
* member MUST NOT exist if there was an error
* invoking the method. The value of this member is
* determined by the method invoked on the Server.
*
* - error: This member is REQUIRED on error. This
* member MUST NOT exist if there was no error
* triggered during invocation.
*
* - id: This member is REQUIRED. It MUST be the same
* as the value of the id member in the Request
* Object. If there was an error in detecting the id
* in the Request object (e.g. Parse error/Invalid
* Request), it MUST be Null. Either the result
* member or error member MUST be included, but both
* members MUST NOT be included.
*
* https://www.jsonrpc.org/specification#response_object
*/
err = plugin_response_handle(plugin, plugin->toks, idtok);
}
/* Corner case: rpc_command hook can destroy plugin for 'plugin
* stop'! */
if (was_plugin_destroyed(pd)) {
*destroyed = true;
} else {
/* Move this object out of the buffer */
memmove(plugin->buffer, plugin->buffer + plugin->toks[0].end,
tal_count(plugin->buffer) - plugin->toks[0].end);
plugin->used -= plugin->toks[0].end;
jsmn_init(&plugin->parser);
toks_reset(plugin->toks);
}
return err;
}
static struct io_plan *plugin_read_json(struct io_conn *conn,
struct plugin *plugin)
{
bool success;
bool have_full;
log_io(plugin->log, LOG_IO_IN, NULL, "",
plugin->buffer + plugin->used, plugin->len_read);
/* Our JSON parser is pretty good at incremental parsing, but
* `getrawblock` gives a giant 2MB token, which forces it to re-parse
* every time until we have all of it. However, we can't complete a
* JSON object without a '}', so we do a cheaper check here.
*/
have_full = memchr(plugin->buffer + plugin->used, '}',
plugin->len_read);
plugin->used += plugin->len_read;
if (plugin->used == tal_count(plugin->buffer))
tal_resize(&plugin->buffer, plugin->used * 2);
/* Read and process all messages from the connection */
if (have_full) {
do {
bool destroyed;
const char *err;
err =
plugin_read_json_one(plugin, &success, &destroyed);
/* If it's destroyed, conn is already freed! */
if (destroyed)
return io_close(NULL);
if (err) {
plugin_kill(plugin, LOG_UNUSUAL,
"%s", err);
/* plugin_kill frees plugin */
return io_close(NULL);
}
} while (success);
}
/* Now read more from the connection */
return io_read_partial(plugin->stdout_conn,
plugin->buffer + plugin->used,
tal_count(plugin->buffer) - plugin->used,
&plugin->len_read, plugin_read_json, plugin);
}
/* Mutual recursion */
static struct io_plan *plugin_write_json(struct io_conn *conn,
struct plugin *plugin);
static struct io_plan *plugin_stream_complete(struct io_conn *conn, struct json_stream *js, struct plugin *plugin)
{
assert(tal_count(plugin->js_arr) > 0);
/* Remove js and shift all remainig over */
tal_arr_remove(&plugin->js_arr, 0);
/* It got dropped off the queue, free it. */
tal_free(js);
return plugin_write_json(conn, plugin);
}
static struct io_plan *plugin_write_json(struct io_conn *conn,
struct plugin *plugin)
{
if (tal_count(plugin->js_arr)) {
return json_stream_output(plugin->js_arr[0], plugin->stdin_conn, plugin_stream_complete, plugin);
}
return io_out_wait(conn, plugin, plugin_write_json, plugin);
}
/* This catches the case where their stdout closes (usually they're dead). */
static void plugin_conn_finish(struct io_conn *conn, struct plugin *plugin)
{
/* This is expected at shutdown of course. */
plugin_kill(plugin,
plugin->plugins->ld->state == LD_STATE_SHUTDOWN
? LOG_DBG : LOG_INFORM,
"exited %s", state_desc(plugin));
}
struct io_plan *plugin_stdin_conn_init(struct io_conn *conn,
struct plugin *plugin)
{
/* We write to their stdin */
/* We don't have anything queued yet, wait for notification */
return io_wait(conn, plugin, plugin_write_json, plugin);
}
struct io_plan *plugin_stdout_conn_init(struct io_conn *conn,
struct plugin *plugin)
{
/* We read from their stdout */
io_set_finish(conn, plugin_conn_finish, plugin);
return io_read_partial(conn, plugin->buffer,
tal_bytelen(plugin->buffer), &plugin->len_read,
plugin_read_json, plugin);
}
/* Returns NULL if invalid value for that type */
static struct plugin_opt_value *plugin_opt_value(const tal_t *ctx,
const char *type,
const char *arg)
{
struct plugin_opt_value *v = tal(ctx, struct plugin_opt_value);
v->as_str = tal_strdup(v, arg);
if (streq(type, "int")) {
long long l;
char *endp;
errno = 0;
l = strtoll(arg, &endp, 0);
if (errno || *endp)
return tal_free(v);
v->as_int = l;
/* Check if the number did not fit in `s64` (in case `long long`
* is a bigger type). */
if (v->as_int != l)
return tal_free(v);
} else if (streq(type, "bool")) {
/* valid values are 'true', 'True', '1', '0', 'false', 'False', or '' */
if (streq(arg, "true") || streq(arg, "True") || streq(arg, "1")) {
v->as_bool = true;
} else if (streq(arg, "false") || streq(arg, "False")
|| streq(arg, "0")) {
v->as_bool = false;
} else
return tal_free(v);
} else if (streq(type, "flag")) {
v->as_bool = true;
}
return v;
}
char *plugin_opt_flag_set(struct plugin_opt *popt)
{
/* A set flag is a true */
tal_free(popt->values);
popt->values = tal_arr(popt, struct plugin_opt_value *, 1);
popt->values[0] = plugin_opt_value(popt->values, popt->type, "true");
return NULL;
}
char *plugin_opt_set(const char *arg, struct plugin_opt *popt)
{
struct plugin_opt_value *v;
/* Warn them that this is deprecated */
if (popt->deprecated && !deprecated_apis)
return tal_fmt(tmpctx, "deprecated option (will be removed!)");
if (!popt->multi) {
tal_free(popt->values);
popt->values = tal_arr(popt, struct plugin_opt_value *, 0);
}
v = plugin_opt_value(popt->values, popt->type, arg);
if (!v)
return tal_fmt(tmpctx, "%s does not parse as type %s",
arg, popt->type);
tal_arr_expand(&popt->values, v);
return NULL;
}
/* Returns true if "name" was already registered and now overwritten. */
static bool plugin_opt_register(struct plugin_opt *popt)
{
bool was_registered = opt_unregister(popt->name);
if (streq(popt->type, "flag"))
opt_register_noarg(popt->name, plugin_opt_flag_set, popt,
popt->description);
else
opt_register_arg(popt->name, plugin_opt_set, NULL, popt,
popt->description);
return was_registered;
}
static void destroy_plugin_opt(struct plugin_opt *opt)
{
/* does nothing when "name" registration replaced its double */
opt_unregister(opt->name);
list_del(&opt->list);
}
/* Add a single plugin option to the plugin as well as registering it with the
* command line options. */
static const char *plugin_opt_add(struct plugin *plugin, const char *buffer,
const jsmntok_t *opt)
{
const jsmntok_t *nametok, *typetok, *defaulttok, *desctok, *deptok, *multitok;
struct plugin_opt *popt;
nametok = json_get_member(buffer, opt, "name");
typetok = json_get_member(buffer, opt, "type");
desctok = json_get_member(buffer, opt, "description");
defaulttok = json_get_member(buffer, opt, "default");
deptok = json_get_member(buffer, opt, "deprecated");
multitok = json_get_member(buffer, opt, "multi");
if (!typetok || !nametok || !desctok) {
return tal_fmt(plugin,
"An option is missing either \"name\", \"description\" or \"type\"");
}
popt = tal(plugin, struct plugin_opt);
popt->values = tal_arr(popt, struct plugin_opt_value *, 0);
popt->name = tal_fmt(popt, "--%.*s", nametok->end - nametok->start,
buffer + nametok->start);
/* an "|" alias could circumvent the unique-option-name check */
if (strchr(popt->name, '|'))
return tal_fmt(plugin, "Option \"name\" may not contain '|'");
popt->description = json_strdup(popt, buffer, desctok);
if (deptok) {
if (!json_to_bool(buffer, deptok, &popt->deprecated))
return tal_fmt(plugin,
"%s: invalid \"deprecated\" field %.*s",
popt->name,
deptok->end - deptok->start,
buffer + deptok->start);
} else
popt->deprecated = false;
if (multitok) {
if (!json_to_bool(buffer, multitok, &popt->multi))
return tal_fmt(plugin,
"%s: invalid \"multi\" field %.*s",
popt->name,
multitok->end - multitok->start,
buffer + multitok->start);
} else
popt->multi = false;
popt->def = NULL;
if (json_tok_streq(buffer, typetok, "string")) {
popt->type = "string";
} else if (json_tok_streq(buffer, typetok, "int")) {
popt->type = "int";
} else if (json_tok_streq(buffer, typetok, "bool")
|| json_tok_streq(buffer, typetok, "flag")) {
popt->type = json_strdup(popt, buffer, typetok);
if (popt->multi)
return tal_fmt(plugin,
"%s type \"%s\" cannot have multi",
popt->name, popt->type);
/* We default flags to false, the default token is ignored */
if (json_tok_streq(buffer, typetok, "flag"))
defaulttok = NULL;
} else {
return tal_fmt(plugin,
"Only \"string\", \"int\", \"bool\", and \"flag\" options are supported");
}
if (defaulttok && !json_tok_is_null(buffer, defaulttok)) {
popt->def = plugin_opt_value(popt, popt->type,
json_strdup(tmpctx, buffer, defaulttok));
if (!popt->def)
return tal_fmt(tmpctx, "default %.*s is not a valid %s",
json_tok_full_len(defaulttok),
json_tok_full(buffer, defaulttok),
popt->type);
}
list_add_tail(&plugin->plugin_opts, &popt->list);
/* Command line options are parsed only during ld's startup and each "name"
* only once. Always registers to satisfy destructor */
if (plugin_opt_register(popt) && plugin->plugins->startup)
fatal("error starting plugin '%s': option name '%s' is already taken", plugin->cmd, popt->name);