108 lines
2.7 KiB
C++
108 lines
2.7 KiB
C++
// This file Copyright © 2015-2022 Mnemosyne LLC.
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// It may be used under GPLv2 (SPDX: GPL-2.0-only), GPLv3 (SPDX: GPL-3.0-only),
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// or any future license endorsed by Mnemosyne LLC.
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// License text can be found in the licenses/ folder.
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#include <cerrno>
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#include <string>
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#include <unordered_set>
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#include <event2/event.h>
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#include <fmt/core.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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struct tr_watchdir_generic
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{
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tr_watchdir_backend base;
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struct event* event;
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std::unordered_set<std::string> dir_entries;
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};
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#define BACKEND_UPCAST(b) (reinterpret_cast<tr_watchdir_generic*>(b))
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/* Non-static and mutable for unit tests. default to 10 sec. */
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auto tr_watchdir_generic_interval = timeval{ 10, 0 };
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/***
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****
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***/
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static void tr_watchdir_generic_on_event(evutil_socket_t /*fd*/, short /*type*/, void* context)
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{
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auto const handle = static_cast<tr_watchdir_t>(context);
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auto* const backend = BACKEND_UPCAST(tr_watchdir_get_backend(handle));
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tr_watchdir_scan(handle, &backend->dir_entries);
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}
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static void tr_watchdir_generic_free(tr_watchdir_backend* backend_base)
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{
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auto* 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_generic_free);
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if (backend->event != nullptr)
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{
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event_del(backend->event);
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event_free(backend->event);
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}
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delete backend;
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}
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tr_watchdir_backend* tr_watchdir_generic_new(tr_watchdir_t handle)
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{
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auto* backend = new tr_watchdir_generic{};
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backend->base.free_func = &tr_watchdir_generic_free;
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if ((backend
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->event = event_new(tr_watchdir_get_event_base(handle), -1, EV_PERSIST, &tr_watchdir_generic_on_event, handle)) ==
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nullptr)
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{
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auto const error_code = errno;
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tr_logAddError(fmt::format(
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_("Couldn't create event: {error} ({error_code})"),
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fmt::arg("error", tr_strerror(error_code)),
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fmt::arg("error_code", error_code)));
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goto FAIL;
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}
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if (event_add(backend->event, &tr_watchdir_generic_interval) == -1)
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{
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auto const error_code = errno;
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tr_logAddError(fmt::format(
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_("Couldn't add event: {error} ({error_code})"),
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fmt::arg("error", tr_strerror(error_code)),
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fmt::arg("error_code", error_code)));
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goto FAIL;
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}
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/* Run initial scan on startup */
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event_active(backend->event, EV_READ, 0);
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return BACKEND_DOWNCAST(backend);
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FAIL:
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tr_watchdir_generic_free(BACKEND_DOWNCAST(backend));
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return nullptr;
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}
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