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// Conserve backup system.
// Copyright 2018-2023 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.
//! Text output formats for structured data.
//!
//! These are objects that accept iterators of different types of content, and write it to a
//! file (typically stdout).
use std::borrow::Cow;
use std::io::{BufWriter, Write};
use std::sync::Arc;
use time::format_description::well_known::Rfc3339;
use time::UtcOffset;
use tracing::error;
use crate::misc::duration_to_hms;
use crate::termui::TermUiMonitor;
use crate::*;
/// Options controlling the behavior of `show_versions`.
#[derive(Default, Clone, Eq, PartialEq)]
pub struct ShowVersionsOptions {
/// Show versions in LIFO order by band_id.
pub newest_first: bool,
/// Show the total size of files in the tree. This is
/// slower because it requires walking the whole index.
pub tree_size: bool,
/// Show the date and time that each backup started.
pub start_time: bool,
/// Show how much time the backup took, or "incomplete" if it never finished.
pub backup_duration: bool,
/// Show times in this zone.
pub timezone: Option<UtcOffset>,
}
/// Print a list of versions, one per line, on stdout.
pub fn show_versions(
archive: &Archive,
options: &ShowVersionsOptions,
monitor: Arc<TermUiMonitor>,
) -> Result<()> {
let mut band_ids = archive.list_band_ids()?;
if options.newest_first {
band_ids.reverse();
}
for band_id in band_ids {
if !(options.tree_size || options.start_time || options.backup_duration) {
println!("{}", band_id);
continue;
}
let mut l: Vec<String> = Vec::new();
l.push(format!("{band_id:<20}"));
let band = match Band::open(archive, band_id) {
Ok(band) => band,
Err(err) => {
error!("Failed to open band {band_id:?}: {err}");
continue;
}
};
let info = match band.get_info() {
Ok(info) => info,
Err(err) => {
error!("Failed to read band tail {band_id:?}: {err}");
continue;
}
};
if options.start_time {
let mut start_time = info.start_time;
if let Some(timezone) = options.timezone {
start_time = start_time.to_offset(timezone);
}
l.push(format!(
"{date:<25}", // "yyyy-mm-ddThh:mm:ss+oooo" => 25
date = start_time.format(&Rfc3339).unwrap(),
));
}
if options.backup_duration {
let duration_str: Cow<str> = if info.is_closed {
if let Some(end_time) = info.end_time {
let duration = end_time - info.start_time;
if let Ok(duration) = duration.try_into() {
duration_to_hms(duration).into()
} else {
Cow::Borrowed("negative")
}
} else {
Cow::Borrowed("unknown")
}
} else {
Cow::Borrowed("incomplete")
};
l.push(format!("{duration_str:>10}"));
}
if options.tree_size {
let tree_mb_str = crate::misc::bytes_to_human_mb(
archive
.open_stored_tree(BandSelectionPolicy::Specified(band_id))?
.size(Exclude::nothing(), monitor.clone())?
.file_bytes,
);
l.push(format!("{tree_mb_str:>14}",));
}
monitor.clear_progress_bars(); // to avoid fighting with stdout
println!("{}", l.join(" "));
}
Ok(())
}
pub fn show_index_json(band: &Band, w: &mut dyn Write) -> Result<()> {
// TODO: Maybe use https://docs.serde.rs/serde/ser/trait.Serializer.html#method.collect_seq.
let bw = BufWriter::new(w);
let index_entries: Vec<IndexEntry> = band.index().iter_entries().collect();
serde_json::ser::to_writer_pretty(bw, &index_entries)
.map_err(|source| Error::SerializeJson { source })
}
pub fn show_entry_names<E: EntryTrait, I: Iterator<Item = E>>(
it: I,
w: &mut dyn Write,
long_listing: bool,
) -> Result<()> {
let mut bw = BufWriter::new(w);
for entry in it {
if long_listing {
writeln!(
bw,
"{} {} {}",
entry.unix_mode(),
entry.owner(),
entry.apath()
)?;
} else {
writeln!(bw, "{}", entry.apath())?;
}
}
Ok(())
}