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96 lines
3.0 KiB
96 lines
3.0 KiB
#ifndef LIGHTNING_LIGHTNINGD_SUBDAEMON_H
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#define LIGHTNING_LIGHTNINGD_SUBDAEMON_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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struct io_conn;
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enum subdaemon_status {
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STATUS_NEED_FD,
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STATUS_COMPLETE
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};
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/* One of our subdaemons. */
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struct subdaemon {
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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 for status (read, then write) */
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struct io_conn *status_conn;
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/* Connection for requests if any (write, then read) */
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struct io_conn *req_conn;
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/* For logging */
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struct log *log;
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/* Callback when status comes in. */
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enum subdaemon_status (*statuscb)(struct subdaemon *, const u8 *, int);
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const char *(*statusname)(int status);
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const char *(*reqname)(int req);
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void (*finished)(struct subdaemon *sd, int status);
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/* Buffer for input. */
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u8 *status_in;
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int status_fd_in;
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/* Requests queue up here. */
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struct list_head reqs;
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};
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/**
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* new_subdaemon - 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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* @statusname: function to get name from status messages
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* @reqname: function to get name from request messages, or NULL if no requests.
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* @statuscb: function to call when status 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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* @statuscb is called with fd == -1 when a status message is
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* received; if it returns STATUS_NEED_FD, we read an fd from the
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* daemon and call it again with that as the third arg.
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*/
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struct subdaemon *new_subdaemon(const tal_t *ctx,
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struct lightningd *ld,
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const char *name,
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const char *(*statusname)(int status),
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const char *(*reqname)(int req),
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enum subdaemon_status (*statuscb)
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(struct subdaemon *, const u8 *, int fd),
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void (*finished)(struct subdaemon *, int), ...);
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/**
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* subdaemon_req - add a request to the subdaemon.
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* @sd: subdaemon to request
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* @msg_out: request message (can be take, can be NULL for fd passing only)
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* @fd_out: if >=0 fd to pass at the end of the message (closed after)
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* @fd_in: if not NULL, where to put fd read in at end of reply.
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* @reqcb: callback when reply comes in
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* @reqcb_data: final arg to hand to @reqcb
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*
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* The subdaemon must take requests.
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*/
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#define subdaemon_req(sd, msg_out, fd_out, fd_in, reqcb, reqcb_data) \
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subdaemon_req_((sd), (msg_out), (fd_out), (fd_in), \
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typesafe_cb_preargs(void, void *, \
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(reqcb), (reqcb_data), \
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struct subdaemon *, \
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const u8 *), \
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(reqcb_data))
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void subdaemon_req_(struct subdaemon *sd,
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const u8 *msg_out,
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int fd_out, int *fd_in,
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void (*reqcb)(struct subdaemon *, const u8 *, void *),
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void *reqcb_data);
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char *opt_subdaemon_debug(const char *optarg, struct lightningd *ld);
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#endif /* LIGHTNING_LIGHTNINGD_SUBDAEMON_H */
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