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// Conserve backup system.
// Copyright 2017-2023 Martin Pool.
// 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 Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//! Abstract Tree trait.
use std::sync::Arc;
use crate::counters::Counter;
use crate::monitor::Monitor;
use crate::*;
/// Abstract Tree that may be either on the real filesystem or stored in an archive.
pub trait ReadTree {
type Entry: EntryTrait + 'static;
type IT: Iterator<Item = Self::Entry>;
/// Iterate, in apath order, all the entries in this tree.
///
/// Errors reading individual paths or directories are sent to the UI and
/// counted, but are not treated as fatal, and don't appear as Results in the
/// iterator.
fn iter_entries(
&self,
subtree: Apath,
exclude: Exclude,
monitor: Arc<dyn Monitor>,
) -> Result<Self::IT>;
/// Measure the tree size.
///
/// This typically requires walking all entries, which may take a while.
fn size(&self, exclude: Exclude, monitor: Arc<dyn Monitor>) -> Result<TreeSize> {
let mut file_bytes = 0u64;
let task = monitor.start_task("Measure tree".to_string());
for e in self.iter_entries(Apath::root(), exclude, monitor.clone())? {
// While just measuring size, ignore directories/files we can't stat.
if let Some(bytes) = e.size() {
monitor.count(Counter::Files, 1);
monitor.count(Counter::FileBytes, bytes as usize);
file_bytes += bytes;
task.increment(bytes as usize);
}
}
Ok(TreeSize { file_bytes })
}
}
/// The measured size of a tree.
pub struct TreeSize {
pub file_bytes: u64,
}