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128 lines
3.9 KiB
128 lines
3.9 KiB
#ifndef LIGHTNING_LIGHTNINGD_SUBD_H
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#define LIGHTNING_LIGHTNINGD_SUBD_H
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#include "config.h"
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#include <ccan/endian/endian.h>
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#include <ccan/list/list.h>
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#include <ccan/short_types/short_types.h>
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#include <ccan/tal/tal.h>
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#include <lightningd/msg_queue.h>
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struct io_conn;
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/* By convention, replies are requests + 100 */
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#define SUBD_REPLY_OFFSET 100
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/* One of our subds. */
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struct subd {
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/* Name, like John, or "lightningd_hsm" */
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const char *name;
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/* The Big Cheese. */
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struct lightningd *ld;
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/* pid, for waiting for status when it dies. */
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int pid;
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/* Connection. */
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struct io_conn *conn;
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/* If we are associated with a single peer, this points to it. */
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struct peer *peer;
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/* For logging */
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struct log *log;
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/* Callback when non-reply message comes in. */
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int (*msgcb)(struct subd *, const u8 *, const int *);
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const char *(*msgname)(int msgtype);
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void (*finished)(struct subd *sd, int status);
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/* Buffer for input. */
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u8 *msg_in;
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/* While we're reading fds in. */
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size_t num_fds_in_read;
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int *fds_in;
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/* Messages queue up here. */
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struct msg_queue outq;
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/* Callbacks for replies. */
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struct list_head reqs;
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};
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/**
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* new_subd - create a new subdaemon.
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* @ctx: context to allocate from
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* @ld: global state
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* @name: basename of daemon
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* @peer: peer to take ownership of if non-NULL
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* @msgname: function to get name from messages
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* @msgcb: function to call when non-fatal message received (or NULL)
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* @finished: function to call when it's finished (with exit status).
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* @...: the fds to hand as fd 3, 4... terminated with -1.
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*
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* @msgcb gets called with @fds set to NULL: if it returns a positive number,
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* that many @fds are received before calling again. If it returns -1, the
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* subdaemon is shutdown.
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*
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* If this succeeds subd owns @peer.
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*/
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struct subd *new_subd(const tal_t *ctx,
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struct lightningd *ld,
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const char *name,
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struct peer *peer,
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const char *(*msgname)(int msgtype),
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int (*msgcb)(struct subd *, const u8 *, const int *fds),
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void (*finished)(struct subd *, int), ...);
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/**
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* subd_send_msg - queue a message to the subdaemon.
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* @sd: subdaemon to request
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* @msg_out: message (can be take)
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*/
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void subd_send_msg(struct subd *sd, const u8 *msg_out);
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/**
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* subd_send_msg - queue a file descriptor to pass to the subdaemon.
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* @sd: subdaemon to request
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* @fd: the file descriptor (closed after passing).
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*/
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void subd_send_fd(struct subd *sd, int fd);
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/**
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* subd_req - queue a request to the subdaemon.
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* @ctx: lifetime for the callback: if this is freed, don't call replycb.
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* @sd: subdaemon to request
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* @msg_out: request message (can be take)
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* @fd_out: if >=0 fd to pass at the end of the message (closed after)
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* @num_fds_in: how many fds to read in to hand to @replycb.
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* @replycb: callback when reply comes in, returns false to shutdown daemon.
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* @replycb_data: final arg to hand to @replycb
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*
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* @replycb cannot free @sd, so it returns false to remove it.
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*/
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#define subd_req(ctx, sd, msg_out, fd_out, num_fds_in, replycb, replycb_data) \
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subd_req_((ctx), (sd), (msg_out), (fd_out), (num_fds_in), \
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typesafe_cb_preargs(bool, void *, \
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(replycb), (replycb_data), \
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struct subd *, \
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const u8 *, const int *), \
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(replycb_data))
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void subd_req_(const tal_t *ctx,
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struct subd *sd,
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const u8 *msg_out,
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int fd_out, size_t num_fds_in,
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bool (*replycb)(struct subd *, const u8 *, const int *, void *),
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void *replycb_data);
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/**
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* subd_shutdown - try to politely shut down a subdaemon.
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* @subd: subd to shutdown.
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* @seconds: maximum seconds to wait for it to exit.
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*
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* This closes the fd to the subdaemon, and gives it a little while to exit.
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* The @finished callback will never be called.
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*/
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void subd_shutdown(struct subd *subd, unsigned int seconds);
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char *opt_subd_debug(const char *optarg, struct lightningd *ld);
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#endif /* LIGHTNING_LIGHTNINGD_SUBD_H */
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