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91 lines
2.0 KiB
C++
91 lines
2.0 KiB
C++
// SPDX-License-Identifier: GPL-2.0-or-later
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// Copyright The Music Player Daemon Project
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#include "InotifyQueue.hxx"
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#include "InotifyDomain.hxx"
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#include "Service.hxx"
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#include "UpdateDomain.hxx"
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#include "lib/fmt/ExceptionFormatter.hxx"
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#include "protocol/Ack.hxx" // for class ProtocolError
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#include "util/StringCompare.hxx"
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#include "Log.hxx"
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/**
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* Wait this long after the last change before calling
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* UpdateService::Enqueue(). This increases the probability that
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* updates can be bundled.
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*/
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static constexpr Event::Duration INOTIFY_UPDATE_DELAY =
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std::chrono::seconds(5);
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void
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InotifyQueue::OnDelay() noexcept
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{
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unsigned id;
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while (!queue.empty()) {
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const char *uri_utf8 = queue.front().c_str();
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try {
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try {
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id = update.Enqueue(uri_utf8, false);
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} catch (const ProtocolError &e) {
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if (e.GetCode() == ACK_ERROR_UPDATE_ALREADY) {
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/* retry later */
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delay_event.Schedule(INOTIFY_UPDATE_DELAY);
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return;
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}
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throw;
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}
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} catch (...) {
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FmtError(update_domain,
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"Failed to enqueue {:?}: {}",
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uri_utf8, std::current_exception());
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queue.pop_front();
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continue;
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}
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FmtDebug(inotify_domain, "updating {:?} job={}",
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uri_utf8, id);
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queue.pop_front();
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}
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}
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[[gnu::pure]]
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static bool
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path_in(const char *path, const char *possible_parent) noexcept
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{
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if (StringIsEmpty(path))
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return true;
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auto rest = StringAfterPrefix(path, possible_parent);
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return rest != nullptr &&
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(StringIsEmpty(rest) || rest[0] == '/');
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}
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void
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InotifyQueue::Enqueue(const char *uri_utf8) noexcept
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{
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delay_event.Schedule(INOTIFY_UPDATE_DELAY);
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for (auto i = queue.begin(), end = queue.end(); i != end;) {
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const char *current_uri = i->c_str();
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if (path_in(uri_utf8, current_uri))
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/* already enqueued */
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return;
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if (path_in(current_uri, uri_utf8))
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/* existing path is a sub-path of the new
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path; we can dequeue the existing path and
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update the new path instead */
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i = queue.erase(i);
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else
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++i;
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}
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queue.emplace_back(uri_utf8);
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}
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