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mu-store/indexer: consume messages from workers

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Add store::consume_message, which is like add message but std::move from
the caller such that the messages longer has copies (with
Xapian::Document) on the caller side; this is to avoid threading issues.
This commit is contained in:
Dirk-Jan C. Binnema 2024-05-08 19:11:40 +03:00
parent ceed832cb9
commit aeb6d44172
3 changed files with 20 additions and 8 deletions
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8
lib/mu-indexer.cc
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@ -241,19 +241,17 @@ Indexer::Private::add_message(const std::string& path)
* The reason for having the lock is some helgrind warnings;
* but it believed those are _false alarms_
* https://gitlab.gnome.org/GNOME/glib/-/issues/2662
*
* For now, set the lock as we were seeing some db corruption.
*/
std::unique_lock lock{w_lock_};
//std::unique_lock lock{w_lock_};
auto msg{Message::make_from_path(path, store_.message_options())};
if (!msg) {
mu_warning("failed to create message from {}: {}", path, msg.error().what());
return false;
}
// if the store was empty, we know that the message is completely new
// and can use the fast path (Xapians 'add_document' rather tahn
// and can use the fast path (Xapians 'add_document' rather than
// 'replace_document)
auto res = store_.add_message(msg.value(), was_empty_);
auto res = store_.consume_message(std::move(msg.value()), was_empty_);
if (!res) {
mu_warning("failed to add message @ {}: {}", path, res.error().what());
return false;

2
lib/mu-store.cc
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@ -1,5 +1,5 @@
/*
** Copyright (C) 2021-2023 Dirk-Jan C. Binnema <djcb@djcbsoftware.nl>
** Copyright (C) 2021-2024 Dirk-Jan C. Binnema <djcb@djcbsoftware.nl>
**
** This program is free software; you can redistribute it and/or modify it
** under the terms of the GNU General Public License as published by the

18
lib/mu-store.hh
View File

@ -204,8 +204,22 @@ public:
*
* @return the doc id of the added message or an error.
*/
Result<Id> add_message(Message& msg, bool is_new = false);
Result<Id> add_message(const std::string& path, bool is_new = false);
Result<Id> add_message(Message &msg, bool is_new = false);
Result<Id> add_message(const std::string &path, bool is_new = false);
/**
* Like add_message(), however, this consumes the message and disposes
* of it when the function ends. This can be useful when injecting
* messages from a worker thread, to ensure no Xapian::Documents
* live in different threads.
*
* @param msg a message
* @param is_new whether this is a completely new message
*/
Result<Id> consume_message(Message&& msg, bool is_new = false) {
Message consumed{std::move(msg)};
return add_message(consumed, is_new);
}
/**
* Remove a message from the store. It will _not_ remove the message