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|
use crate::chunkid::ChunkId;
use crate::error::ObnamError;
use crate::fsentry::FilesystemEntry;
use rusqlite::{params, Connection, OpenFlags, Row, Transaction};
use std::path::Path;
/// A nascent backup generation.
///
/// A nascent generation is one that is being prepared. It isn't
/// finished yet, and it's not actually on the server until the upload
/// of its generation chunk.
pub struct NascentGeneration {
conn: Connection,
fileno: u64,
}
impl NascentGeneration {
pub fn create<P>(filename: P) -> anyhow::Result<Self>
where
P: AsRef<Path>,
{
let flags = OpenFlags::SQLITE_OPEN_CREATE | OpenFlags::SQLITE_OPEN_READ_WRITE;
let conn = Connection::open_with_flags(filename, flags)?;
conn.execute(
"CREATE TABLE files (fileno INTEGER PRIMARY KEY, json TEXT)",
params![],
)?;
conn.execute(
"CREATE TABLE chunks (fileno INTEGER, chunkid TEXT)",
params![],
)?;
conn.pragma_update(None, "journal_mode", &"WAL")?;
Ok(Self { conn, fileno: 0 })
}
pub fn file_count(&self) -> u64 {
self.fileno
}
pub fn insert(&mut self, e: FilesystemEntry, ids: &[ChunkId]) -> anyhow::Result<()> {
let t = self.conn.transaction()?;
self.fileno += 1;
insert_one(&t, e, self.fileno, ids)?;
t.commit()?;
Ok(())
}
pub fn insert_iter(
&mut self,
entries: impl Iterator<Item = anyhow::Result<(FilesystemEntry, Vec<ChunkId>)>>,
) -> anyhow::Result<()> {
let t = self.conn.transaction()?;
for r in entries {
let (e, ids) = r?;
self.fileno += 1;
insert_one(&t, e, self.fileno, &ids[..])?;
}
t.commit()?;
Ok(())
}
}
fn row_to_entry(row: &Row) -> rusqlite::Result<(u64, String)> {
let fileno: i64 = row.get(row.column_index("fileno")?)?;
let fileno = fileno as u64;
let json: String = row.get(row.column_index("json")?)?;
Ok((fileno, json))
}
fn insert_one(
t: &Transaction,
e: FilesystemEntry,
fileno: u64,
ids: &[ChunkId],
) -> anyhow::Result<()> {
let fileno = fileno as i64;
let json = serde_json::to_string(&e)?;
t.execute(
"INSERT INTO files (fileno, json) VALUES (?1, ?2)",
params![fileno, &json],
)?;
for id in ids {
t.execute(
"INSERT INTO chunks (fileno, chunkid) VALUES (?1, ?2)",
params![fileno, id],
)?;
}
Ok(())
}
#[cfg(test)]
mod test {
use super::NascentGeneration;
use tempfile::NamedTempFile;
#[test]
fn empty() {
let filename = NamedTempFile::new().unwrap().path().to_path_buf();
{
let mut _gen = NascentGeneration::create(&filename).unwrap();
// _gen is dropped here; the connection is close; the file
// should not be removed.
}
assert!(filename.exists());
}
}
/// A finished generation.
///
/// A generation is finished when it's on the server. It can be restored.
#[derive(Debug, Clone)]
pub struct FinishedGeneration {
id: ChunkId,
ended: String,
}
impl FinishedGeneration {
pub fn new(id: &str, ended: &str) -> Self {
let id = id.parse().unwrap(); // this never fails
Self {
id,
ended: ended.to_string(),
}
}
pub fn id(&self) -> ChunkId {
self.id.clone()
}
pub fn ended(&self) -> &str {
&self.ended
}
}
/// A local representation of a finished generation.
///
/// This is for querying an existing generation, and other read-only
/// operations.
pub struct LocalGeneration {
conn: Connection,
}
impl LocalGeneration {
pub fn open<P>(filename: P) -> anyhow::Result<Self>
where
P: AsRef<Path>,
{
let flags = OpenFlags::SQLITE_OPEN_READ_WRITE;
let conn = Connection::open_with_flags(filename, flags)?;
conn.pragma_update(None, "journal_mode", &"WAL")?;
Ok(Self { conn })
}
pub fn file_count(&self) -> anyhow::Result<u32> {
let mut stmt = self.conn.prepare("SELECT count(*) FROM files")?;
let mut iter = stmt.query_map(params![], |row| row.get(0))?;
let count = iter.next().expect("SQL count result");
let count = count?;
Ok(count)
}
pub fn files(&self) -> anyhow::Result<Vec<(u64, FilesystemEntry)>> {
let mut stmt = self.conn.prepare("SELECT * FROM files")?;
let iter = stmt.query_map(params![], |row| row_to_entry(row))?;
let mut files: Vec<(u64, FilesystemEntry)> = vec![];
for x in iter {
let (fileno, json) = x?;
let entry = serde_json::from_str(&json)?;
files.push((fileno, entry));
}
Ok(files)
}
pub fn chunkids(&self, fileno: u64) -> anyhow::Result<Vec<ChunkId>> {
let fileno = fileno as i64;
let mut stmt = self
.conn
.prepare("SELECT chunkid FROM chunks WHERE fileno = ?1")?;
let iter = stmt.query_map(params![fileno], |row| Ok(row.get(0)?))?;
let mut ids: Vec<ChunkId> = vec![];
for x in iter {
let fileno: String = x?;
ids.push(ChunkId::from(&fileno));
}
Ok(ids)
}
pub fn get_file(&self, filename: &Path) -> anyhow::Result<Option<FilesystemEntry>> {
match self.get_file_and_fileno(filename)? {
None => Ok(None),
Some((_, e)) => Ok(Some(e)),
}
}
pub fn get_fileno(&self, filename: &Path) -> anyhow::Result<Option<u64>> {
match self.get_file_and_fileno(filename)? {
None => Ok(None),
Some((id, _)) => Ok(Some(id)),
}
}
fn get_file_and_fileno(
&self,
filename: &Path,
) -> anyhow::Result<Option<(u64, FilesystemEntry)>> {
let files = self.files()?;
let files: Vec<(u64, FilesystemEntry)> = files
.iter()
.filter(|(_, e)| e.pathbuf() == filename)
.map(|(id, e)| (*id, e.clone()))
.collect();
match files.len() {
0 => Ok(None),
1 => Ok(Some((files[0].0, files[0].1.clone()))),
_ => return Err(ObnamError::TooManyFiles(filename.to_path_buf()).into()),
}
}
}
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