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use crate::client::{BackupClient, ClientConfig};
use crate::fsentry::FilesystemEntry;
use crate::fsiter::FsIterator;
use crate::generation::{LocalGeneration, NascentGeneration};
use indicatif::{ProgressBar, ProgressStyle};
use log::{debug, info};
use rusqlite::types::ToSqlOutput;
use rusqlite::ToSql;
use std::fmt;
use tempfile::NamedTempFile;
pub fn backup(config: &ClientConfig, buffer_size: usize) -> anyhow::Result<()> {
let client = BackupClient::new(&config.server_url)?;
// Create a named temporary file. We don't meed the open file
// handle, so we discard that.
let oldname = {
let temp = NamedTempFile::new()?;
let (_, dbname) = temp.keep()?;
dbname
};
// Create a named temporary file. We don't meed the open file
// handle, so we discard that.
let newname = {
let temp = NamedTempFile::new()?;
let (_, dbname) = temp.keep()?;
dbname
};
let genlist = client.list_generations()?;
{
let iter = FsIterator::new(&config.root);
let mut new = NascentGeneration::create(&newname)?;
let progress = create_progress_bar(true);
progress.enable_steady_tick(100);
match genlist.resolve("latest") {
None => {
info!("fresh backup without a previous generation");
new.insert_iter(iter.map(|entry| {
progress.inc(1);
match entry {
Err(err) => Err(err),
Ok(entry) => {
let path = &entry.pathbuf();
info!("backup: {}", path.display());
progress.set_message(&format!("{}", path.display()));
let (new_entry, ids) =
client.upload_filesystem_entry(entry, buffer_size)?;
Ok((new_entry, ids, Reason::IsNew))
}
}
}))?;
}
Some(old) => {
info!("incremental backup based on {}", old);
let old = client.fetch_generation(&old, &oldname)?;
progress.set_length(old.file_count()? as u64);
new.insert_iter(iter.map(|entry| {
progress.inc(1);
match entry {
Err(err) => Err(err),
Ok(entry) => {
let path = &entry.pathbuf();
info!("backup: {}", path.display());
progress.set_message(&format!("{}", path.display()));
let reason = needs_backup(&old, &entry);
match reason {
Reason::IsNew | Reason::Changed | Reason::Error => {
let (new_entry, ids) =
client.upload_filesystem_entry(entry, buffer_size)?;
Ok((new_entry, ids, reason))
}
Reason::Unchanged => {
let fileno = old.get_fileno(&entry.pathbuf())?;
let ids = if let Some(fileno) = fileno {
old.chunkids(fileno)?
} else {
vec![]
};
Ok((entry.clone(), ids, Reason::Unchanged))
}
}
}
}
}))?;
}
}
progress.set_length(new.file_count() as u64);
progress.finish();
}
// Upload the SQLite file, i.e., the named temporary file, which
// still exists, since we persisted it above.
let gen_id = client.upload_generation(&newname, buffer_size)?;
println!("gen id: {}", gen_id);
// Delete the temporary file.q
std::fs::remove_file(&newname)?;
std::fs::remove_file(&oldname)?;
Ok(())
}
#[derive(Debug)]
pub enum Reason {
IsNew,
Changed,
Unchanged,
Error,
}
impl ToSql for Reason {
fn to_sql(&self) -> rusqlite::Result<ToSqlOutput> {
Ok(ToSqlOutput::Owned(rusqlite::types::Value::Text(format!(
"{}",
self
))))
}
}
impl fmt::Display for Reason {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let reason = match self {
Reason::IsNew => "new",
Reason::Changed => "changed",
Reason::Unchanged => "unchanged",
Reason::Error => "error",
};
write!(f, "{}", reason)
}
}
fn create_progress_bar(verbose: bool) -> ProgressBar {
let progress = if verbose {
ProgressBar::new(0)
} else {
ProgressBar::hidden()
};
let parts = vec![
"{wide_bar}",
"elapsed: {elapsed}",
"files: {pos}/{len}",
"current: {wide_msg}",
"{spinner}",
];
progress.set_style(ProgressStyle::default_bar().template(&parts.join("\n")));
progress
}
fn needs_backup(old: &LocalGeneration, new_entry: &FilesystemEntry) -> Reason {
let new_name = new_entry.pathbuf();
match old.get_file(&new_name) {
// File is not in old generation.
Ok(None) => {
debug!(
"needs_backup: file is not in old generation, needs backup: {:?}",
new_name
);
Reason::IsNew
}
// File is in old generation. Has its metadata changed?
Ok(Some(old_entry)) => {
if file_has_changed(&old_entry, new_entry) {
debug!("needs_backup: file has changed: {:?}", new_name);
Reason::Changed
} else {
debug!("needs_backup: file has NOT changed: {:?}", new_name);
Reason::Unchanged
}
}
// There was an error, which we ignore, but we indicate the
// file needs to be backed up now.
Err(err) => {
debug!(
"needs_backup: lookup in old generation returned error, ignored: {:?}: {}",
new_name, err
);
Reason::Error
}
}
}
fn file_has_changed(old: &FilesystemEntry, new: &FilesystemEntry) -> bool {
let unchanged = old.kind() == new.kind()
&& old.len() == new.len()
&& old.mode() == new.mode()
&& old.mtime() == new.mtime()
&& old.mtime_ns() == new.mtime_ns()
&& old.symlink_target() == new.symlink_target();
!unchanged
}
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