use super::Db;use crate::{hash, loose, zlib::stream::DeflateWriter};use git_object::{owned, HashKind};use std::{fs, io, io::Write, path::PathBuf};use tempfile::NamedTempFile; /// Returned by the [`crate::Write`] trait implementation of [`Db`]#[derive(thiserror::Error, Debug)]#[allow(missing_docs)]pub enum Error { #[error("Could not {message} '{path}'")] Io { source: io::Error, message: &'static str, path: PathBuf, }, #[error("An IO error occurred while writing an object")] IoRaw(#[from] io::Error), #[error("Could not turn temporary file into persisted file at '{target}'")] Persist { source: tempfile::PersistError, target: PathBuf, },} impl crate::Write for Db { type Error = Error; /// Write the given buffer in `from` to disk in one syscall at best. /// /// This will cost at least 4 IO operations. fn write_buf(&self, kind: git_object::Kind, from: &[u8], hash: HashKind) -> Result<owned::Id, Self::Error> { match hash { HashKind::Sha1 => { let mut to = self.write_header(kind, from.len() as u64, hash)?; to.write_all(from).map_err(|err| Error::Io { source: err, message: "stream all data into tempfile in", path: self.path.to_owned(), })?; to.flush()?; self.finalize_object(to) } } } /// Write the given stream in `from` to disk with at least one syscall. /// /// This will cost at least 4 IO operations. fn write_stream( &self, kind: git_object::Kind, size: u64, mut from: impl io::Read, hash: HashKind, ) -> Result<owned::Id, Self::Error> { match hash { HashKind::Sha1 => { let mut to = self.write_header(kind, size, hash)?; io::copy(&mut from, &mut to).map_err(|err| Error::Io { source: err, message: "stream all data into tempfile in", path: self.path.to_owned(), })?; to.flush()?; self.finalize_object(to) } } }} type HashAndTempFile = DeflateWriter<NamedTempFile>; impl Db { fn write_header( &self, kind: git_object::Kind, size: u64, hash: HashKind, ) -> Result<hash::Write<HashAndTempFile>, Error> { let mut to = hash::Write::new( DeflateWriter::new(NamedTempFile::new_in(&self.path).map_err(|err| Error::Io { source: err, message: "create named temp file in", path: self.path.to_owned(), })?), hash, ); loose::object::header::encode(kind, size, &mut to).map_err(|err| Error::Io { source: err, message: "write header to tempfile in", path: self.path.to_owned(), })?; Ok(to) } fn finalize_object( &self, hash::Write { hash, inner: file }: hash::Write<HashAndTempFile>, ) -> Result<owned::Id, Error> { let id = owned::Id::from(hash.digest()); let object_path = loose::db::sha1_path(id.to_borrowed(), self.path.clone()); let object_dir = object_path .parent() .expect("each object path has a 1 hex-bytes directory"); if let Err(err) = fs::create_dir(object_dir) { match err.kind() { io::ErrorKind::AlreadyExists => {} _ => return Err(err.into()), } } let file = file.into_inner(); file.persist(&object_path).map_err(|err| Error::Persist { source: err, target: object_path, })?; Ok(id) }}
use super::Db;
use crate::{hash, loose, zlib::stream::DeflateWriter};
use git_object::{owned, HashKind};
use std::{fs, io, io::Write, path::PathBuf};
use tempfile::NamedTempFile;
/// Returned by the [`crate::Write`] trait implementation of [`Db`]
#[derive(thiserror::Error, Debug)]
#[allow(missing_docs)]
pub enum Error {
#[error("Could not {message} '{path}'")]
Io {
source: io::Error,
message: &'static str,
path: PathBuf,
},
#[error("An IO error occurred while writing an object")]
IoRaw(#[from] io::Error),
#[error("Could not turn temporary file into persisted file at '{target}'")]
Persist {
source: tempfile::PersistError,
target: PathBuf,
},
}
impl crate::Write for Db {
type Error = Error;
/// Write the given buffer in `from` to disk in one syscall at best.
///
/// This will cost at least 4 IO operations.
fn write_buf(&self, kind: git_object::Kind, from: &[u8], hash: HashKind) -> Result<owned::Id, Self::Error> {
match hash {
HashKind::Sha1 => {
let mut to = self.write_header(kind, from.len() as u64, hash)?;
to.write_all(from).map_err(|err| Error::Io {
source: err,
message: "stream all data into tempfile in",
path: self.path.to_owned(),
})?;
to.flush()?;
self.finalize_object(to)
}
}
}
/// Write the given stream in `from` to disk with at least one syscall.
///
/// This will cost at least 4 IO operations.
fn write_stream(
&self,
kind: git_object::Kind,
size: u64,
mut from: impl io::Read,
hash: HashKind,
) -> Result<owned::Id, Self::Error> {
match hash {
HashKind::Sha1 => {
let mut to = self.write_header(kind, size, hash)?;
io::copy(&mut from, &mut to).map_err(|err| Error::Io {
source: err,
message: "stream all data into tempfile in",
path: self.path.to_owned(),
})?;
to.flush()?;
self.finalize_object(to)
}
}
}
}
type HashAndTempFile = DeflateWriter<NamedTempFile>;
impl Db {
fn write_header(
&self,
kind: git_object::Kind,
size: u64,
hash: HashKind,
) -> Result<hash::Write<HashAndTempFile>, Error> {
let mut to = hash::Write::new(
DeflateWriter::new(NamedTempFile::new_in(&self.path).map_err(|err| Error::Io {
source: err,
message: "create named temp file in",
path: self.path.to_owned(),
})?),
hash,
);
loose::object::header::encode(kind, size, &mut to).map_err(|err| Error::Io {
source: err,
message: "write header to tempfile in",
path: self.path.to_owned(),
})?;
Ok(to)
}
fn finalize_object(
&self,
hash::Write { hash, inner: file }: hash::Write<HashAndTempFile>,
) -> Result<owned::Id, Error> {
let id = owned::Id::from(hash.digest());
let object_path = loose::db::sha1_path(id.to_borrowed(), self.path.clone());
let object_dir = object_path
.parent()
.expect("each object path has a 1 hex-bytes directory");
if let Err(err) = fs::create_dir(object_dir) {
match err.kind() {
io::ErrorKind::AlreadyExists => {}
_ => return Err(err.into()),
}
}
let file = file.into_inner();
file.persist(&object_path).map_err(|err| Error::Persist {
source: err,
target: object_path,
})?;
Ok(id)
}
}