208 lines
5.3 KiB
C++
208 lines
5.3 KiB
C++
/*
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* This file Copyright (C) 2015-2016 Mnemosyne LLC
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*
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* It may be used under the GNU GPL versions 2 or 3
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* or any future license endorsed by Mnemosyne LLC.
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*
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*/
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#include <errno.h>
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#include <limits.h> /* NAME_MAX */
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#include <stdlib.h> /* realloc() */
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#include <unistd.h> /* close() */
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#include <sys/inotify.h>
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#include <event2/bufferevent.h>
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#include <event2/event.h>
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#define LIBTRANSMISSION_WATCHDIR_MODULE
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#include "transmission.h"
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#include "log.h"
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#include "tr-assert.h"
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#include "utils.h"
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#include "watchdir.h"
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#include "watchdir-common.h"
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/***
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****
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***/
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#define log_error(...) \
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(!tr_logLevelIsActive(TR_LOG_ERROR) ? (void)0 : \
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tr_logAddMessage(__FILE__, __LINE__, TR_LOG_ERROR, "watchdir:inotify", __VA_ARGS__))
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/***
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****
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***/
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typedef struct tr_watchdir_inotify
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{
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tr_watchdir_backend base;
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int infd;
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int inwd;
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struct bufferevent* event;
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} tr_watchdir_inotify;
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#define BACKEND_UPCAST(b) ((tr_watchdir_inotify*)(b))
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#define INOTIFY_WATCH_MASK (IN_CLOSE_WRITE | IN_MOVED_TO | IN_CREATE)
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/***
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****
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***/
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static void tr_watchdir_inotify_on_first_scan(evutil_socket_t fd, short type, void* context)
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{
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TR_UNUSED(fd);
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TR_UNUSED(type);
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auto const handle = static_cast<tr_watchdir_t>(context);
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tr_watchdir_scan(handle, nullptr);
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}
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static void tr_watchdir_inotify_on_event(struct bufferevent* event, void* context)
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{
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TR_ASSERT(context != nullptr);
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auto const handle = static_cast<tr_watchdir_t>(context);
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#ifdef TR_ENABLE_ASSERTS
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tr_watchdir_inotify const* const backend = BACKEND_UPCAST(tr_watchdir_get_backend(handle));
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#endif
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struct inotify_event ev;
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size_t nread;
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size_t name_size = NAME_MAX + 1;
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char* name = tr_new(char, name_size);
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/* Read the size of the struct excluding name into buf. Guaranteed to have at
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least sizeof(ev) available */
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while ((nread = bufferevent_read(event, &ev, sizeof(ev))) != 0)
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{
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if (nread == (size_t)-1)
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{
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log_error("Failed to read inotify event: %s", tr_strerror(errno));
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break;
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}
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if (nread != sizeof(ev))
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{
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log_error("Failed to read inotify event: expected %zu, got %zu bytes.", sizeof(ev), nread);
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break;
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}
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TR_ASSERT(ev.wd == backend->inwd);
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TR_ASSERT((ev.mask & INOTIFY_WATCH_MASK) != 0);
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TR_ASSERT(ev.len > 0);
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if (ev.len > name_size)
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{
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name_size = ev.len;
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name = tr_renew(char, name, name_size);
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}
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/* Consume entire name into buffer */
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if ((nread = bufferevent_read(event, name, ev.len)) == (size_t)-1)
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{
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log_error("Failed to read inotify name: %s", tr_strerror(errno));
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break;
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}
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if (nread != ev.len)
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{
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log_error("Failed to read inotify name: expected %" PRIu32 ", got %zu bytes.", ev.len, nread);
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break;
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}
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tr_watchdir_process(handle, name);
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}
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tr_free(name);
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}
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static void tr_watchdir_inotify_free(tr_watchdir_backend* backend_base)
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{
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tr_watchdir_inotify* const backend = BACKEND_UPCAST(backend_base);
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if (backend == nullptr)
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{
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return;
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}
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TR_ASSERT(backend->base.free_func == &tr_watchdir_inotify_free);
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if (backend->event != nullptr)
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{
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bufferevent_disable(backend->event, EV_READ);
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bufferevent_free(backend->event);
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}
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if (backend->infd != -1)
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{
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if (backend->inwd != -1)
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{
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inotify_rm_watch(backend->infd, backend->inwd);
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}
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close(backend->infd);
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}
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tr_free(backend);
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}
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tr_watchdir_backend* tr_watchdir_inotify_new(tr_watchdir_t handle)
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{
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char const* const path = tr_watchdir_get_path(handle);
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tr_watchdir_inotify* backend;
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backend = tr_new0(tr_watchdir_inotify, 1);
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backend->base.free_func = &tr_watchdir_inotify_free;
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backend->infd = -1;
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backend->inwd = -1;
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if ((backend->infd = inotify_init()) == -1)
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{
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log_error("Unable to inotify_init: %s", tr_strerror(errno));
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goto FAIL;
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}
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if ((backend->inwd = inotify_add_watch(backend->infd, path, INOTIFY_WATCH_MASK | IN_ONLYDIR)) == -1)
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{
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log_error("Failed to setup watchdir \"%s\": %s (%d)", path, tr_strerror(errno), errno);
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goto FAIL;
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}
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if ((backend->event = bufferevent_socket_new(tr_watchdir_get_event_base(handle), backend->infd, 0)) == nullptr)
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{
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log_error("Failed to create event buffer: %s", tr_strerror(errno));
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goto FAIL;
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}
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/* Guarantees at least the sizeof an inotify event will be available in the
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event buffer */
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bufferevent_setwatermark(backend->event, EV_READ, sizeof(struct inotify_event), 0);
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bufferevent_setcb(backend->event, &tr_watchdir_inotify_on_event, nullptr, nullptr, handle);
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bufferevent_enable(backend->event, EV_READ);
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/* Perform an initial scan on the directory */
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if (event_base_once(
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tr_watchdir_get_event_base(handle),
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-1,
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EV_TIMEOUT,
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&tr_watchdir_inotify_on_first_scan,
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handle,
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nullptr) == -1)
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{
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log_error("Failed to perform initial scan: %s", tr_strerror(errno));
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}
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return BACKEND_DOWNCAST(backend);
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FAIL:
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tr_watchdir_inotify_free(BACKEND_DOWNCAST(backend));
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return nullptr;
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}
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