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76 lines
3.5 KiB
Protocol Buffer
76 lines
3.5 KiB
Protocol Buffer
// This file is part of Moonfire NVR, a security camera digital video recorder.
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// Copyright (C) 2018 Scott Lamb <slamb@slamb.org>
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// In addition, as a special exception, the copyright holders give
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// permission to link the code of portions of this program with the
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// OpenSSL library under certain conditions as described in each
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// individual source file, and distribute linked combinations including
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// the two.
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//
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// You must obey the GNU General Public License in all respects for all
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// of the code used other than OpenSSL. If you modify file(s) with this
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// exception, you may extend this exception to your version of the
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// file(s), but you are not obligated to do so. If you do not wish to do
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// so, delete this exception statement from your version. If you delete
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// this exception statement from all source files in the program, then
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// also delete it here.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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syntax = "proto3";
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// Metadata stored in sample file dirs as "<dir>/meta". This is checked
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// against the metadata stored within the database to detect inconsistencies
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// between the directory and database, including the following:
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//
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// * sample file directory's disk not being mounted.
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// * mixing up mount points of two sample file directories belonging to the
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// same database.
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// * directory renames not properly recorded in the database.
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// * restoration of the database from backup but not the sample file
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// directory.
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// * restoration of the sample file directory but not the database.
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// * two sample file directory paths pointed at the same inode via symlinks
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// or non-canonical paths. (Note that flock(2) has a design flaw in which
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// multiple file descriptors can share a lock, so the current locking scheme
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// is not sufficient to detect this otherwise.)
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// * database and sample file directories forked from the same version, opened
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// the same number of times, then crossed.
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message DirMeta {
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// A uuid associated with the database, in binary form. dir_uuid is strictly
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// more powerful, but it improves diagnostics to know if the directory
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// belongs to the expected database at all or not.
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bytes db_uuid = 1;
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// A uuid associated with the directory itself.
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bytes dir_uuid = 2;
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// Corresponds to an entry in the `open` database table.
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message Open {
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uint32 id = 1;
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bytes uuid = 2;
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}
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// The last open that was known to be recorded in the database as completed.
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// Absent if this has never happened. Note this can backtrack in exactly one
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// scenario: when deleting the directory, after all associated files have
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// been deleted, last_complete_open can be moved to in_progress_open.
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Open last_complete_open = 3;
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// The last run which is in progress, if different from last_complete_open.
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// This may or may not have been recorded in the database, but it's
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// guaranteed that no data has yet been written by this open.
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Open in_progress_open = 4;
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}
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