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#ifndef LIGHTNING_LIGHTNINGD_SUBD_H
#define LIGHTNING_LIGHTNINGD_SUBD_H
#include "config.h"
#include <ccan/endian/endian.h>
#include <ccan/list/list.h>
#include <ccan/short_types/short_types.h>
#include <ccan/tal/tal.h>
#include <ccan/typesafe_cb/typesafe_cb.h>
#include <common/msg_queue.h>
#include <wire/wire.h>
struct crypto_state;
struct io_conn;
struct per_peer_state;
/* By convention, replies are requests + 100 */
#define SUBD_REPLY_OFFSET 100
/* And reply failures are requests + 200 */
#define SUBD_REPLYFAIL_OFFSET 200
/* One of our subds. */
struct subd {
/* Name, like John, or "lightning_hsmd" */
const char *name;
/* The Big Cheese. */
struct lightningd *ld;
/* pid, for waiting for status when it dies. */
int pid;
/* Connection. */
struct io_conn *conn;
/* If we are associated with a single channel, this points to it. */
void *channel;
/* For logging */
struct log *log;
/* Callback when non-reply message comes in (inside db transaction) */
unsigned (*msgcb)(struct subd *, const u8 *, const int *);
const char *(*msgname)(int msgtype);
/* If per_peer_state == NULL, it was a disconnect/crash. Otherwise,
* sufficient information to hand back to gossipd, including the
* error message we sent them if any. */
void (*errcb)(void *channel,
struct per_peer_state *pps,
const struct channel_id *channel_id,
const char *desc,
bool soft_error,
const u8 *err_for_them);
/* Callback to display information for listpeers RPC */
void (*billboardcb)(void *channel, bool perm, const char *happenings);
/* Buffer for input. */
u8 *msg_in;
/* While we're reading fds in. */
size_t num_fds_in_read;
int *fds_in;
/* For global daemons: we fail if they fail. */
bool must_not_exit;
/* Do we talk to a peer? ie. not onchaind */
bool talks_to_peer;
/* Messages queue up here. */
struct msg_queue *outq;
/* Callbacks for replies. */
struct list_head reqs;
};
/**
* new_global_subd - create a new global subdaemon.
* @ld: global state
* @name: basename of daemon
* @msgname: function to get name from messages
* @msgcb: function to call (inside db transaction) when non-fatal message received
* @...: NULL-terminated list of pointers to fds to hand as fd 3, 4...
* (can be take, if so, set to -1)
*
* @msgcb gets called with @fds set to NULL: if it returns a positive number,
* that many @fds are received before calling again. @msgcb can free subd
* to shut it down.
*/
struct subd *new_global_subd(struct lightningd *ld,
const char *name,
const char *(*msgname)(int msgtype),
unsigned int (*msgcb)(struct subd *, const u8 *,
const int *fds),
...);
/**
* new_channel_subd - create a new subdaemon for a specific channel.
* @ld: global state
* @name: basename of daemon
* @channel: channel to associate.
* @base_log: log to use (actually makes a copy so it has name in prefix)
* @msgname: function to get name from messages
* @msgcb: function to call (inside db transaction) when non-fatal message received (or NULL)
* @errcb: function to call on errors.
* @billboardcb: function to call for billboard updates.
* @...: NULL-terminated list of pointers to fds to hand as fd 3, 4...
* (can be take, if so, set to -1)
*
* @msgcb gets called with @fds set to NULL: if it returns a positive number,
* that many @fds are received before calling again. If it returns -1, the
* subdaemon is shutdown.
*/
struct subd *new_channel_subd_(struct lightningd *ld,
const char *name,
void *channel,
struct log *base_log,
bool talks_to_peer,
const char *(*msgname)(int msgtype),
unsigned int (*msgcb)(struct subd *, const u8 *,
const int *fds),
void (*errcb)(void *channel,
struct per_peer_state *pps,
const struct channel_id *channel_id,
const char *desc,
bool soft_error,
const u8 *err_for_them),
void (*billboardcb)(void *channel, bool perm,
const char *happenings),
...);
#define new_channel_subd(ld, name, channel, log, talks_to_peer, msgname, \
msgcb, errcb, billboardcb, ...) \
new_channel_subd_((ld), (name), (channel), (log), (talks_to_peer), \
(msgname), (msgcb), \
typesafe_cb_postargs(void, void *, (errcb), \
(channel), \
struct per_peer_state *, \
const struct channel_id *, \
const char *, bool, const u8 *), \
typesafe_cb_postargs(void, void *, (billboardcb), \
(channel), bool, \
const char *), \
__VA_ARGS__)
/**
* subd_send_msg - queue a message to the subdaemon.
* @sd: subdaemon to request
* @msg_out: message (can be take)
*/
void subd_send_msg(struct subd *sd, const u8 *msg_out);
/**
* subd_send_fd - queue a file descriptor to pass to the subdaemon.
* @sd: subdaemon to request
* @fd: the file descriptor (closed after passing).
*/
void subd_send_fd(struct subd *sd, int fd);
/**
* subd_req - queue a request to the subdaemon.
* @ctx: lifetime for the callback: if this is freed, don't call replycb.
* @sd: subdaemon to request
* @msg_out: request message (can be take)
* @fd_out: if >=0 fd to pass at the end of the message (closed after)
* @num_fds_in: how many fds to read in to hand to @replycb if it's a reply.
* @replycb: callback (inside db transaction) when reply comes in (can free subd)
* @replycb_data: final arg to hand to @replycb
*
* @replycb cannot free @sd, so it returns false to remove it.
* Note that @replycb is called for replies of type @msg_out + SUBD_REPLY_OFFSET
* with @num_fds_in fds, or type @msg_out + SUBD_REPLYFAIL_OFFSET with no fds.
*/
#define subd_req(ctx, sd, msg_out, fd_out, num_fds_in, replycb, replycb_data) \
subd_req_((ctx), (sd), (msg_out), (fd_out), (num_fds_in), \
typesafe_cb_preargs(void, void *, \
(replycb), (replycb_data), \
struct subd *, \
const u8 *, const int *), \
(replycb_data))
void subd_req_(const tal_t *ctx,
struct subd *sd,
const u8 *msg_out,
int fd_out, size_t num_fds_in,
void (*replycb)(struct subd *, const u8 *, const int *, void *),
void *replycb_data);
/**
* subd_release_channel - shut down a subdaemon which no longer owns the channel.
* @owner: subd which owned channel.
* @channel: channel to release.
*
* If the subdaemon is not already shutting down, and it is a per-channel
* subdaemon, this shuts it down.
*/
void subd_release_channel(struct subd *owner, void *channel);
/**
* subd_shutdown - try to politely shut down a subdaemon.
* @subd: subd to shutdown.
* @seconds: maximum seconds to wait for it to exit.
*
* This closes the fd to the subdaemon, and gives it a little while to exit.
* The @finished callback will never be called.
*
* Return value is null, so pattern should be:
*
* sd = subd_shutdown(sd, 10);
*/
struct subd *subd_shutdown(struct subd *subd, unsigned int seconds);
/* Ugly helper to get full pathname of the current binary. */
const char *find_my_abspath(const tal_t *ctx, const char *argv0);
#if DEVELOPER
char *opt_subd_dev_disconnect(const char *optarg, struct lightningd *ld);
bool dev_disconnect_permanent(struct lightningd *ld);
#endif /* DEVELOPER */
#endif /* LIGHTNING_LIGHTNINGD_SUBD_H */