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jsonrpc.c
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/* Code for JSON_RPC API.
*
* Each socket connection is represented by a `struct json_connection`.
*
* This can have zero, one or more `struct command` in progress at a time:
* because the json_connection can be closed at any point, these `struct command`
* have a independent lifetimes.
*
* Each `struct command` writes into a `struct json_stream`, which is created
* the moment they start writing output (see attach_json_stream). Initially
* the struct command owns it since they're writing into it. When they're
* done, the `json_connection` needs to drain it (if it's still around). At
* that point, the `json_connection` becomes the owner (or it's simply freed).
*/
/* eg: { "jsonrpc":"2.0", "method" : "dev-echo", "params" : [ "hello", "Arabella!" ], "id" : "1" } */
#include "config.h"
#include <ccan/asort/asort.h>
#include <ccan/err/err.h>
#include <ccan/io/io.h>
#include <ccan/json_escape/json_escape.h>
#include <ccan/json_out/json_out.h>
#include <ccan/tal/str/str.h>
#include <common/configdir.h>
#include <common/json_command.h>
#include <common/json_param.h>
#include <common/memleak.h>
#include <common/timeout.h>
#include <db/exec.h>
#include <fcntl.h>
#include <lightningd/jsonrpc.h>
#include <lightningd/plugin_hook.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/un.h>
/* Dummy structure. */
struct command_result {
char c;
};
static struct command_result param_failed, complete, pending, unknown;
struct command_result *command_param_failed(void)
{
return ¶m_failed;
}
struct command_result *command_its_complicated(const char *relationship_details
UNNEEDED)
{
return &unknown;
}
/* This represents a JSON RPC connection. It can invoke multiple commands, but
* a command can outlive the connection, which could close any time. */
struct json_connection {
/* The global state */
struct lightningd *ld;
/* This io_conn (and our owner!) */
struct io_conn *conn;
/* Logging for this json connection. */
struct log *log;
/* The buffer (required to interpret tokens). */
char *buffer;
/* Internal state: */
/* How much is already filled. */
size_t used;
/* How much has just been filled. */
size_t len_read;
/* JSON parsing state. */
jsmn_parser input_parser;
jsmntok_t *input_toks;
/* Our commands */
struct list_head commands;
/* Are notifications enabled? */
bool notifications_enabled;
/* Our json_streams (owned by the commands themselves while running).
* Since multiple streams could start returning data at once, we
* always service these in order, freeing once empty. */
struct json_stream **js_arr;
};
/**
* `jsonrpc` encapsulates the entire state of the JSON-RPC interface,
* including a list of methods that the interface supports (can be
* appended dynamically, e.g., for plugins, and logs. It also serves
* as a convenient `tal`-parent for all JSON-RPC related allocations.
*/
struct jsonrpc {
struct io_listener *rpc_listener;
struct json_command **commands;
/* Map from json command names to usage strings: we don't put this inside
* struct json_command as it's good practice to have those const. */
STRMAP(const char *) usagemap;
};
/* The command itself usually owns the stream, because jcon may get closed.
* The command transfers ownership once it's done though. */
static struct json_stream *jcon_new_json_stream(const tal_t *ctx,
struct json_connection *jcon,
struct command *writer)
{
struct json_stream *js = new_json_stream(ctx, writer, jcon->log);
/* Wake writer to start streaming, in case it's not already. */
io_wake(jcon);
/* FIXME: Keep streams around for recycling. */
tal_arr_expand(&jcon->js_arr, js);
return js;
}
static void jcon_remove_json_stream(struct json_connection *jcon,
struct json_stream *js)
{
for (size_t i = 0; i < tal_count(jcon->js_arr); i++) {
if (js != jcon->js_arr[i])
continue;
tal_arr_remove(&jcon->js_arr, i);
return;
}
abort();
}
/* jcon and cmd have separate lifetimes: we detach them on either destruction */
static void destroy_jcon(struct json_connection *jcon)
{
struct command *c;
list_for_each(&jcon->commands, c, list)
c->jcon = NULL;
/* Make sure this happens last! */
tal_free(jcon->log);
}
static struct command_result *json_help(struct command *cmd,
const char *buffer,
const jsmntok_t *obj UNNEEDED,
const jsmntok_t *params);
static const struct json_command help_command = {
"help",
"utility",
json_help,
"List available commands, or give verbose help on one {command}.",
.verbose = "help [command]\n"
"Without [command]:\n"
" Outputs an array of objects with 'command' and 'description'\n"
"With [command]:\n"
" Give a single object containing 'verbose', which completely describes\n"
" the command inputs and outputs."
};
AUTODATA(json_command, &help_command);
static struct command_result *json_stop(struct command *cmd,
const char *buffer,
const jsmntok_t *obj UNNEEDED,
const jsmntok_t *params)
{
struct json_out *jout;
const char *p;
size_t len;
if (!param(cmd, buffer, params, NULL))
return command_param_failed();
log_unusual(cmd->ld->log, "JSON-RPC shutdown");
/* With rpc_command_hook, jcon might have closed in the meantime! */
if (!cmd->jcon) {
/* Return us to toplevel lightningd.c */
log_debug(cmd->ld->log, "io_break: %s", __func__);
io_break(cmd->ld);
return command_still_pending(cmd);
}
cmd->ld->stop_conn = cmd->jcon->conn;
/* This is the one place where result is a literal string. */
jout = json_out_new(tmpctx);
json_out_start(jout, NULL, '{');
json_out_addstr(jout, "jsonrpc", "2.0");
/* id may be a string or number, so copy direct. */
memcpy(json_out_member_direct(jout, "id", strlen(cmd->id)),
cmd->id, strlen(cmd->id));
json_out_addstr(jout, "result", "Shutdown complete");
json_out_end(jout, '}');
json_out_finished(jout);
/* Add two \n */
memcpy(json_out_direct(jout, 2), "\n\n", strlen("\n\n"));
p = json_out_contents(jout, &len);
cmd->ld->stop_response = tal_strndup(cmd->ld, p, len);
/* Wake write loop in case it's not already. */
io_wake(cmd->jcon);
return command_still_pending(cmd);
}
static const struct json_command stop_command = {
"stop",
"utility",
json_stop,
"Shut down the lightningd process"
};
AUTODATA(json_command, &stop_command);
#if DEVELOPER
struct slowcmd {
struct command *cmd;
unsigned *msec;
struct json_stream *js;
};
static void slowcmd_finish(struct slowcmd *sc)
{
json_add_num(sc->js, "msec", *sc->msec);
was_pending(command_success(sc->cmd, sc->js));
}
static void slowcmd_start(struct slowcmd *sc)
{
sc->js = json_stream_success(sc->cmd);
new_reltimer(sc->cmd->ld->timers, sc, time_from_msec(*sc->msec),
slowcmd_finish, sc);
}
static struct command_result *json_dev(struct command *cmd UNUSED,
const char *buffer,
const jsmntok_t *obj UNNEEDED,
const jsmntok_t *params)
{
const char *subcmd;
subcmd = param_subcommand(cmd, buffer, params,
"crash", "rhash", "slowcmd", NULL);
if (!subcmd)
return command_param_failed();
if (streq(subcmd, "crash")) {
if (!param(cmd, buffer, params,
p_req("subcommand", param_ignore, cmd),
NULL))
return command_param_failed();
fatal("Crash at user request");
} else if (streq(subcmd, "slowcmd")) {
struct slowcmd *sc = tal(cmd, struct slowcmd);
sc->cmd = cmd;
if (!param(cmd, buffer, params,
p_req("subcommand", param_ignore, cmd),
p_opt_def("msec", param_number, &sc->msec, 1000),
NULL))
return command_param_failed();
new_reltimer(cmd->ld->timers, sc, time_from_msec(0),
slowcmd_start, sc);
return command_still_pending(cmd);
} else {
assert(streq(subcmd, "rhash"));
struct json_stream *response;
struct sha256 *secret;
if (!param(cmd, buffer, params,
p_req("subcommand", param_ignore, cmd),
p_req("secret", param_sha256, &secret),
NULL))
return command_param_failed();
/* Hash in place. */
sha256(secret, secret, sizeof(*secret));
response = json_stream_success(cmd);
json_add_sha256(response, "rhash", secret);
return command_success(cmd, response);
}
}
static const struct json_command dev_command = {
"dev",
"developer",
json_dev,
"Developer command test multiplexer",
.verbose = "dev rhash {secret}\n"
" Show SHA256 of {secret}\n"
"dev crash\n"
" Crash lightningd by calling fatal()\n"
"dev slowcmd {msec}\n"
" Torture test for slow commands, optional {msec}\n"
};
AUTODATA(json_command, &dev_command);
#endif /* DEVELOPER */
static size_t num_cmdlist;
static struct json_command **get_cmdlist(void)
{
static struct json_command **cmdlist;
if (!cmdlist)
cmdlist = autodata_get(json_command, &num_cmdlist);
return cmdlist;
}
static void json_add_help_command(struct command *cmd,
struct json_stream *response,
struct json_command *json_command)
{
char *usage;
/* If they disallow deprecated APIs, don't even list them */
if (!deprecated_apis && json_command->deprecated)
return;
usage = tal_fmt(cmd, "%s%s %s",
json_command->name,
json_command->deprecated ? " (DEPRECATED!)" : "",
strmap_get(&cmd->ld->jsonrpc->usagemap,
json_command->name));
json_object_start(response, NULL);
json_add_string(response, "command", usage);
json_add_string(response, "category", json_command->category);
json_add_string(response, "description", json_command->description);
if (!json_command->verbose) {
json_add_string(response, "verbose",
"HELP! Please contribute"
" a description for this"
" json_command!");
} else {
struct json_escape *esc;
esc = json_escape(NULL, json_command->verbose);
json_add_escaped_string(response, "verbose", take(esc));
}
json_object_end(response);
}
static const struct json_command *find_command(struct json_command **commands,
const char *cmdname)
{
for (size_t i = 0; i < tal_count(commands); i++) {
if (streq(cmdname, commands[i]->name))
return commands[i];
}
return NULL;
}
static int compare_commands_name(struct json_command *const *a,
struct json_command *const *b, void *unused)
{
return strcmp((*a)->name, (*b)->name);
}
static struct command_result *json_help(struct command *cmd,
const char *buffer,
const jsmntok_t *obj UNNEEDED,
const jsmntok_t *params)
{
struct json_stream *response;
const char *cmdname;
struct json_command **commands;
const struct json_command *one_cmd;
if (!param(cmd, buffer, params,
p_opt("command", param_string, &cmdname),
NULL))
return command_param_failed();
commands = cmd->ld->jsonrpc->commands;
if (cmdname) {
one_cmd = find_command(commands, cmdname);
if (!one_cmd)
return command_fail(cmd, JSONRPC2_METHOD_NOT_FOUND,
"Unknown command %s",
cmdname);
if (!deprecated_apis && one_cmd->deprecated)
return command_fail(cmd, JSONRPC2_METHOD_NOT_FOUND,
"Deprecated command %s",
cmdname);
} else
one_cmd = NULL;
asort(commands, tal_count(commands), compare_commands_name, NULL);
response = json_stream_success(cmd);
json_array_start(response, "help");
for (size_t i = 0; i < tal_count(commands); i++) {
if (!one_cmd || one_cmd == commands[i])
json_add_help_command(cmd, response, commands[i]);
}
json_array_end(response);
/* Tell cli this is simple enough to be formatted flat for humans */
json_add_string(response, "format-hint", "simple");
return command_success(cmd, response);
}
static const struct json_command *find_cmd(const struct jsonrpc *rpc,
const char *buffer,
const jsmntok_t *tok)
{
struct json_command **commands = rpc->commands;
for (size_t i = 0; i < tal_count(commands); i++)
if (json_tok_streq(buffer, tok, commands[i]->name))
return commands[i];
return NULL;
}
/* This can be called directly on shutdown, even with unfinished cmd */
static void destroy_command(struct command *cmd)
{
if (!cmd->jcon) {
log_debug(cmd->ld->log,
"Command returned result after jcon close");
return;
}
list_del_from(&cmd->jcon->commands, &cmd->list);
}
struct command_result *command_raw_complete(struct command *cmd,
struct json_stream *result)
{
json_stream_close(result, cmd);
/* If we have a jcon, it will free result for us. */
if (cmd->jcon)
tal_steal(cmd->jcon, result);
tal_free(cmd);
return &complete;
}
struct command_result *command_success(struct command *cmd,
struct json_stream *result)
{
assert(cmd);
assert(cmd->json_stream == result);
json_object_end(result);
json_object_end(result);
return command_raw_complete(cmd, result);
}
struct command_result *command_failed(struct command *cmd,
struct json_stream *result)
{
assert(cmd->json_stream == result);
/* Have to close error */
json_object_end(result);
json_object_end(result);
return command_raw_complete(cmd, result);
}
struct command_result *command_fail(struct command *cmd, errcode_t code,
const char *fmt, ...)
{
const char *errmsg;
struct json_stream *r;
va_list ap;
va_start(ap, fmt);
errmsg = tal_vfmt(cmd, fmt, ap);
va_end(ap);
r = json_stream_fail_nodata(cmd, code, errmsg);
return command_failed(cmd, r);
}
struct command_result *command_still_pending(struct command *cmd)
{
notleak_with_children(cmd);
cmd->pending = true;
/* If we've started writing, wake reader. */
if (cmd->json_stream)
json_stream_flush(cmd->json_stream);
return &pending;
}
static void json_command_malformed(struct json_connection *jcon,
const char *id,
const char *error)
{
/* NULL writer is OK here, since we close it immediately. */
struct json_stream *js = jcon_new_json_stream(jcon, jcon, NULL);
json_object_start(js, NULL);
json_add_string(js, "jsonrpc", "2.0");
json_add_primitive(js, "id", id);
json_object_start(js, "error");
json_add_errcode(js, "code", JSONRPC2_INVALID_REQUEST);
json_add_string(js, "message", error);
json_object_end(js);
json_object_end(js);
json_stream_close(js, NULL);
}
void json_notify_fmt(struct command *cmd,
enum log_level level,
const char *fmt, ...)
{
va_list ap;
struct json_stream *js;
if (!cmd->send_notifications)
return;
js = json_stream_raw_for_cmd(cmd);
va_start(ap, fmt);
json_object_start(js, NULL);
json_add_string(js, "jsonrpc", "2.0");
json_add_string(js, "method", "message");
json_object_start(js, "params");
json_add_string(js, "id", cmd->id);
json_add_string(js, "level", log_level_name(level));
json_add_string(js, "message", tal_vfmt(tmpctx, fmt, ap));
json_object_end(js);
json_object_end(js);
json_stream_double_cr(js);
json_stream_flush(js);
}
struct json_stream *json_stream_raw_for_cmd(struct command *cmd)
{
struct json_stream *js;
/* Might have already opened it for a notification */
if (cmd->json_stream)
return cmd->json_stream;
/* If they still care about the result, attach it to them. */
if (cmd->jcon)
js = jcon_new_json_stream(cmd, cmd->jcon, cmd);
else
js = new_json_stream(cmd, cmd, NULL);
assert(!cmd->json_stream);
cmd->json_stream = js;
return js;
}
void json_stream_log_suppress_for_cmd(struct json_stream *js,
const struct command *cmd)
{
const char *nm = cmd->json_cmd->name;
const char *s = tal_fmt(tmpctx, "Suppressing logging of %s command", nm);
log_io(cmd->jcon->log, LOG_IO_OUT, NULL, s, NULL, 0);
json_stream_log_suppress(js, strdup(nm));
}
static struct json_stream *json_start(struct command *cmd)
{
struct json_stream *js = json_stream_raw_for_cmd(cmd);
json_object_start(js, NULL);
json_add_string(js, "jsonrpc", "2.0");
json_add_jsonstr(js, "id", cmd->id, strlen(cmd->id));
return js;
}
struct json_stream *json_stream_success(struct command *cmd)
{
struct json_stream *r = json_start(cmd);
json_object_start(r, "result");
return r;
}
struct json_stream *json_stream_fail_nodata(struct command *cmd,
errcode_t code,
const char *errmsg)
{
struct json_stream *js = json_start(cmd);
assert(code);
json_object_start(js, "error");
json_add_errcode(js, "code", code);
json_add_string(js, "message", errmsg);
return js;
}
struct json_stream *json_stream_fail(struct command *cmd,
errcode_t code,
const char *errmsg)
{
struct json_stream *r = json_stream_fail_nodata(cmd, code, errmsg);
json_object_start(r, "data");
return r;
}
static struct command_result *command_exec(struct json_connection *jcon,
struct command *cmd,
const char *buffer,
const jsmntok_t *request,
const jsmntok_t *params)
{
struct command_result *res;
res = cmd->json_cmd->dispatch(cmd, buffer, request, params);
assert(res == ¶m_failed
|| res == &complete
|| res == &pending
|| res == &unknown);
/* If they didn't complete it, they must call command_still_pending.
* If they completed it, it's freed already. */
if (res == &pending)
assert(cmd->pending);
/* The command might outlive the connection. */
if (jcon)
list_for_each(&jcon->commands, cmd, list)
assert(cmd->pending);
return res;
}
/* A plugin hook to take over (fail/alter) RPC commands */
struct rpc_command_hook_payload {
struct command *cmd;
const char *buffer;
const jsmntok_t *request;
/* custom response/replace/error options plugins can have */
const char *custom_result;
const char *custom_error;
const jsmntok_t *custom_replace;
const char *custom_buffer;
};
static void rpc_command_hook_serialize(struct rpc_command_hook_payload *p,
struct json_stream *s,
struct plugin *plugin)
{
const jsmntok_t *tok;
size_t i;
char *key;
json_object_start(s, "rpc_command");
#ifdef COMPAT_V081
if (deprecated_apis)
json_add_tok(s, "rpc_command", p->request, p->buffer);
#endif
json_for_each_obj(i, tok, p->request) {
key = tal_strndup(NULL, p->buffer + tok->start,
tok->end - tok->start);
json_add_tok(s, key, tok + 1, p->buffer);
tal_free(key);
}
json_object_end(s);
}
static void replace_command(struct rpc_command_hook_payload *p,
const char *buffer,
const jsmntok_t *replacetok)
{
const jsmntok_t *method = NULL, *params = NULL;
const char *bad;
/* Must contain "method", "params" and "id" */
if (replacetok->type != JSMN_OBJECT) {
bad = "'replace' must be an object";
goto fail;
}
method = json_get_member(buffer, replacetok, "method");
if (!method) {
bad = "missing 'method'";
goto fail;
}
params = json_get_member(buffer, replacetok, "params");
if (!params) {
bad = "missing 'params'";
goto fail;
}
if (!json_get_member(buffer, replacetok, "id")) {
bad = "missing 'id'";
goto fail;
}
p->cmd->json_cmd = find_cmd(p->cmd->ld->jsonrpc, buffer, method);
if (!p->cmd->json_cmd) {
bad = tal_fmt(tmpctx, "redirected to unknown method '%.*s'",
method->end - method->start,
buffer + method->start);
goto fail;
}
// deprecated phase to give the possibility to all to migrate and stay safe
// from this more restrictive change.
if (!deprecated_apis) {
const jsmntok_t *jsonrpc = json_get_member(buffer, replacetok, "jsonrpc");
if (!jsonrpc || jsonrpc->type != JSMN_STRING || !json_tok_streq(buffer, jsonrpc, "2.0")) {
bad = "jsonrpc: \"2.0\" must be specified in the request";
goto fail;
}
}
was_pending(command_exec(p->cmd->jcon, p->cmd, buffer, replacetok,
params));
return;
fail:
was_pending(command_fail(p->cmd, JSONRPC2_INVALID_REQUEST,
"Bad response to 'rpc_command' hook: %s", bad));
}
static void rpc_command_hook_final(struct rpc_command_hook_payload *p STEALS)
{
const jsmntok_t *params;
/* Free payload with cmd */
tal_steal(p->cmd, p);
if (p->custom_result != NULL) {
struct json_stream *s = json_start(p->cmd);
json_add_jsonstr(s, "result",
p->custom_result, strlen(p->custom_result));
json_object_end(s);
return was_pending(command_raw_complete(p->cmd, s));
}
if (p->custom_error != NULL) {
struct json_stream *s = json_start(p->cmd);
json_add_jsonstr(s, "error",
p->custom_error, strlen(p->custom_error));
json_object_end(s);
return was_pending(command_raw_complete(p->cmd, s));
}
if (p->custom_replace != NULL)
return replace_command(p, p->custom_buffer, p->custom_replace);
/* If no plugin requested a change, just continue command execution. */
params = json_get_member(p->buffer, p->request, "params");
return was_pending(command_exec(p->cmd->jcon,
p->cmd,
p->buffer,
p->request,
params));
}
static bool
rpc_command_hook_callback(struct rpc_command_hook_payload *p,
const char *buffer, const jsmntok_t *resulttok)
{
const struct lightningd *ld = p->cmd->ld;
const jsmntok_t *tok, *custom_return;
static char *error = "";
char *method;
if (!resulttok || !buffer)
return true;
tok = json_get_member(buffer, resulttok, "result");
if (tok) {
if (!json_tok_streq(buffer, tok, "continue")) {
error = "'result' should only be 'continue'.";
goto log_error_and_skip;
}
/* plugin tells us to do nothing. just pass. */
return true;
}
/* didn't just continue but hook was already modified by prior plugin */
if (p->custom_result != NULL ||
p->custom_error != NULL ||
p->custom_replace != NULL) {
/* get method name and log error (only the first time). */
tok = json_get_member(p->buffer, p->request, "method");
method = tal_strndup(p, p->buffer + tok->start, tok->end - tok->start);
log_unusual(ld->log, "rpc_command hook '%s' already modified, ignoring.", method );
rpc_command_hook_final(p);
return false;
}
/* If the registered plugin did not respond with continue,
* it wants either to replace the request... */
tok = json_get_member(buffer, resulttok, "replace");
if (tok) {
/* We need to make copies here, as buffer and tokens
* can be reused. */
p->custom_replace = json_tok_copy(p, tok);
p->custom_buffer = tal_dup_talarr(p, char, buffer);
return true;
}
/* ...or return a custom JSONRPC response. */
tok = json_get_member(buffer, resulttok, "return");
if (tok) {
custom_return = json_get_member(buffer, tok, "result");
if (custom_return) {
p->custom_result = json_strdup(p, buffer, custom_return);
return true;
}
custom_return = json_get_member(buffer, tok, "error");
if (custom_return) {
errcode_t code;
const char *errmsg;
if (!json_to_errcode(buffer,
json_get_member(buffer, custom_return, "code"),
&code)) {
error = "'error' object does not contain a code.";
goto log_error_and_skip;
}
errmsg = json_strdup(tmpctx, buffer,
json_get_member(buffer, custom_return, "message"));
if (!errmsg) {
error = "'error' object does not contain a message.";
goto log_error_and_skip;
}
p->custom_error = json_strdup(p, buffer, custom_return);
return true;
}
}
log_error_and_skip:
/* Just log BROKEN errors. Give other plugins a chance. */
log_broken(ld->log, "Bad response to 'rpc_command' hook. %s", error);
return true;
}
REGISTER_PLUGIN_HOOK(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. */
static struct command_result *
parse_request(struct json_connection *jcon, const jsmntok_t tok[])
{
const jsmntok_t *method, *id, *params;
struct command *c;
struct rpc_command_hook_payload *rpc_hook;
bool completed;
if (tok[0].type != JSMN_OBJECT) {
json_command_malformed(jcon, "null",
"Expected {} for json command");
return NULL;
}
method = json_get_member(jcon->buffer, tok, "method");
params = json_get_member(jcon->buffer, tok, "params");
id = json_get_member(jcon->buffer, tok, "id");
if (!id) {
json_command_malformed(jcon, "null", "No id");
return NULL;
}
if (id->type != JSMN_STRING && id->type != JSMN_PRIMITIVE) {
json_command_malformed(jcon, "null",
"Expected string/primitive for id");
return NULL;
}
// Adding a deprecated phase to make sure that all the Core Lightning wrapper
// can migrate all the frameworks
if (!deprecated_apis) {
const jsmntok_t *jsonrpc = json_get_member(jcon->buffer, tok, "jsonrpc");
if (!jsonrpc || jsonrpc->type != JSMN_STRING || !json_tok_streq(jcon->buffer, jsonrpc, "2.0")) {
json_command_malformed(jcon, "null", "jsonrpc: \"2.0\" must be specified in the request");
return NULL;
}
}
/* Allocate the command off of the `jsonrpc` object and not
* the connection since the command may outlive `conn`. */
c = tal(jcon->ld->jsonrpc, struct command);
c->jcon = jcon;
c->send_notifications = jcon->notifications_enabled;
c->ld = jcon->ld;
c->pending = false;
c->json_stream = NULL;
c->id = tal_strndup(c,
json_tok_full(jcon->buffer, id),
json_tok_full_len(id));
c->mode = CMD_NORMAL;
list_add_tail(&jcon->commands, &c->list);
tal_add_destructor(c, destroy_command);
if (!method || !params) {
return command_fail(c, JSONRPC2_INVALID_REQUEST,
method ? "No params" : "No method");
}
if (method->type != JSMN_STRING) {
return command_fail(c, JSONRPC2_INVALID_REQUEST,
"Expected string for method");
}
c->json_cmd = find_cmd(jcon->ld->jsonrpc, jcon->buffer, method);
if (!c->json_cmd) {
return command_fail(
c, JSONRPC2_METHOD_NOT_FOUND, "Unknown command '%.*s'",
method->end - method->start, jcon->buffer + method->start);
}
if (c->json_cmd->deprecated && !deprecated_apis) {
return command_fail(c, JSONRPC2_METHOD_NOT_FOUND,
"Command %.*s is deprecated",
json_tok_full_len(method),
json_tok_full(jcon->buffer, method));
}
if (jcon->ld->state == LD_STATE_SHUTDOWN) {
return command_fail(c, LIGHTNINGD_SHUTDOWN,
"lightningd is shutting down");
}
rpc_hook = tal(c, 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);
rpc_hook->request = tal_dup_talarr(rpc_hook, jsmntok_t, tok);
/* NULL the custom_ values for the hooks */
rpc_hook->custom_result = NULL;
rpc_hook->custom_error = NULL;
rpc_hook->custom_replace = NULL;
rpc_hook->custom_buffer = NULL;
db_begin_transaction(jcon->ld->wallet->db);
completed = plugin_hook_call_rpc_command(jcon->ld, rpc_hook);
db_commit_transaction(jcon->ld->wallet->db);
/* If it's deferred, mark it (otherwise, it's completed) */
if (!completed)
return command_still_pending(c);
return NULL;
}
/* Mutual recursion */
static struct io_plan *stream_out_complete(struct io_conn *conn,
struct json_stream *js,
struct json_connection *jcon);
static struct io_plan *start_json_stream(struct io_conn *conn,
struct json_connection *jcon)
{
/* If something has created an output buffer, start streaming. */
if (tal_count(jcon->js_arr)) {
size_t len;
const char *p = json_out_contents(jcon->js_arr[0]->jout, &len);
if (len)
log_io(jcon->log, LOG_IO_OUT, NULL, "", p, len);
return json_stream_output(jcon->js_arr[0], conn,
stream_out_complete, jcon);
}
/* Tell reader it can run next command. */
io_wake(conn);
/* Once the stop_conn conn is drained, we can shut down. */
if (jcon->ld->stop_conn == conn && jcon->ld->state == LD_STATE_RUNNING) {
/* Return us to toplevel lightningd.c */
log_debug(jcon->ld->log, "io_break: %s", __func__);
io_break(jcon->ld);
/* We never come back. */
return io_out_wait(conn, conn, io_never, conn);
}
return io_out_wait(conn, jcon, start_json_stream, jcon);
}
/* Command has completed writing, and we've written it all out to conn. */
static struct io_plan *stream_out_complete(struct io_conn *conn,
struct json_stream *js,
struct json_connection *jcon)
{