Add basic `Snapshot` object
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/*
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* Created on Thu Oct 01 2020
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*
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* This file is a part of TerrabaseDB
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* Copyright (c) 2020, Sayan Nandan <ohsayan at outlook dot com>
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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 Affero 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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* 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 Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*
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*/
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//! Tools for creating snapshots
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use crate::coredb::CoreDB;
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use chrono::prelude::*;
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use libtdb::TResult;
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/// # Snapshot
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///
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/// This object provides methods to create and delete snapshots. There should be a
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/// `snapshot_scheduler` which should hold an instance of this object, on startup.
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/// Whenever the duration expires, the caller should call `mksnap()`
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pub struct Snapshot {
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/// File names of the snapshots (relative paths)
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snaps: Vec<String>,
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/// The maximum number of snapshots to be kept
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maxtop: usize,
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/// An atomic reference to the coretable
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dbref: CoreDB,
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}
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impl Snapshot {
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/// Create a new `Snapshot` instance
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pub fn new(maxtop: usize, dbref: CoreDB) -> Self {
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Snapshot {
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snaps: Vec::with_capacity(maxtop),
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maxtop,
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dbref,
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}
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}
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/// Generate the snapshot name
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fn get_snapname(&self) -> String {
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Utc::now()
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.format("./snapshots/%Y%m%d-%H%M%S.snapshot")
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.to_string()
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}
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pub fn mksnap(&mut self) -> TResult<()> {
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todo!("Snapshotting hasn't been implemented yet!")
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}
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}
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