mirror of
https://github.com/aljazceru/lightning.git
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6a8cd9a016
1. Allow timers to be freed in their callback. 2. Clarify in header that we have to terminate our timer with timer_finished() eventually. 3. We don't currently have plugins with more than one outstanding timer, but it certainly would be possible, so fix in_timer to be a counter. Suggested-by: @ZmnSCPxj Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
133 lines
4.2 KiB
C
133 lines
4.2 KiB
C
/* Helper library for C plugins. */
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#ifndef LIGHTNING_PLUGINS_LIBPLUGIN_H
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#define LIGHTNING_PLUGINS_LIBPLUGIN_H
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#include "config.h"
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#include <common/json.h>
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#include <common/json_command.h>
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#include <common/json_helpers.h>
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#include <common/jsonrpc_errors.h>
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#include <common/param.h>
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struct command;
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struct plugin_conn;
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extern bool deprecated_apis;
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/* Create an array of these, one for each command you support. */
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struct plugin_command {
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const char *name;
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const char *description;
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const char *long_description;
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struct command_result *(*handle)(struct command *cmd,
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const char *buf,
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const jsmntok_t *params);
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};
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/* Create an array of these, one for each --option you support. */
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struct plugin_option {
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const char *name;
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const char *description;
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char *(*handle)(const char *str, void *arg);
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void *arg;
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};
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/* Return this iff the param() call failed in your handler. */
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struct command_result *command_param_failed(void);
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/* Call this on fatal error. */
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void NORETURN plugin_err(const char *fmt, ...);
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/* This command is finished, here's a detailed error; @cmd cannot be
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* NULL, data can be NULL. */
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struct command_result *WARN_UNUSED_RESULT
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command_done_err(struct command *cmd,
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int code,
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const char *errmsg,
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const char *data);
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/* This command is finished, here's the success msg; @cmd cannot be NULL. */
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struct command_result *WARN_UNUSED_RESULT
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command_success(struct command *cmd, const char *result);
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/* Synchronous helper to send command and extract single field from
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* response; can only be used in init callback. */
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const char *rpc_delve(const tal_t *ctx,
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const char *method, const char *params,
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struct plugin_conn *rpc, const char *guide);
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/* Async rpc request. For convenience, and single ' are turned into ".
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* @cmd can be NULL if we're coming from a timer callback.
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*/
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PRINTF_FMT(6,7) struct command_result *
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send_outreq_(struct command *cmd,
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const char *method,
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struct command_result *(*cb)(struct command *command,
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const char *buf,
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const jsmntok_t *result,
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void *arg),
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struct command_result *(*errcb)(struct command *command,
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const char *buf,
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const jsmntok_t *result,
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void *arg),
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void *arg,
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const char *paramfmt_single_ticks, ...);
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#define send_outreq(cmd, method, cb, errcb, arg, ...) \
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send_outreq_((cmd), (method), \
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typesafe_cb_preargs(struct command_result *, void *, \
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(cb), (arg), \
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struct command *command, \
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const char *buf, \
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const jsmntok_t *result), \
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typesafe_cb_preargs(struct command_result *, void *, \
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(errcb), (arg), \
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struct command *command, \
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const char *buf, \
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const jsmntok_t *result), \
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(arg), __VA_ARGS__)
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/* Callback to just forward error and close request; @cmd cannot be NULL */
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struct command_result *forward_error(struct command *cmd,
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const char *buf,
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const jsmntok_t *error,
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void *arg);
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/* Callback to just forward result and close request; @cmd cannot be NULL */
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struct command_result *forward_result(struct command *cmd,
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const char *buf,
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const jsmntok_t *result,
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void *arg);
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/* Callback for timer where we expect a 'command_result'. All timers
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* must return this eventually, though they may do so via a convoluted
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* send_req() path. */
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struct command_result *timer_complete(void);
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/* Access timer infrastructure to add a timer.
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*
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* Freeing this releases the timer, otherwise it's freed after @cb
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* if it hasn't been freed already.
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*/
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struct plugin_timer *plugin_timer(struct plugin_conn *rpc,
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struct timerel t,
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struct command_result *(*cb)(void));
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/* Macro to define arguments */
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#define plugin_option(name, description, set, arg) \
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(name), \
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(description), \
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typesafe_cb_preargs(char *, void *, (set), (arg), const char *), \
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(arg)
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/* Standard helpers */
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char *u64_option(const char *arg, u64 *i);
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char *charp_option(const char *arg, char **p);
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/* The main plugin runner: append with 0 or more plugin_option(), then NULL. */
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void NORETURN LAST_ARG_NULL plugin_main(char *argv[],
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void (*init)(struct plugin_conn *rpc),
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const struct plugin_command *commands,
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size_t num_commands, ...);
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#endif /* LIGHTNING_PLUGINS_LIBPLUGIN_H */
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