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use crate::serialization::{Addr, SerializationSink};
use parking_lot::Mutex;
use std::error::Error;
use std::fs;
use std::io::Write;
use std::path::Path;
pub struct FileSerializationSink {
data: Mutex<Inner>,
}
struct Inner {
file: fs::File,
buffer: Vec<u8>,
buf_pos: usize,
addr: u32,
}
impl SerializationSink for FileSerializationSink {
fn from_path(path: &Path) -> Result<Self, Box<dyn Error>> {
fs::create_dir_all(path.parent().unwrap())?;
let file = fs::File::create(path)?;
Ok(FileSerializationSink {
data: Mutex::new(Inner {
file,
buffer: vec![0; 1024 * 512],
buf_pos: 0,
addr: 0,
}),
})
}
#[inline]
fn write_atomic<W>(&self, num_bytes: usize, write: W) -> Addr
where
W: FnOnce(&mut [u8]),
{
let mut data = self.data.lock();
let Inner {
ref mut file,
ref mut buffer,
ref mut buf_pos,
ref mut addr,
} = *data;
let curr_addr = *addr;
*addr += num_bytes as u32;
let buf_start = *buf_pos;
let buf_end = buf_start + num_bytes;
if buf_end <= buffer.len() {
write(&mut buffer[buf_start..buf_end]);
*buf_pos = buf_end;
} else {
file.write_all(&buffer[..buf_start]).unwrap();
if num_bytes <= buffer.len() {
write(&mut buffer[0..num_bytes]);
*buf_pos = num_bytes;
} else {
let mut temp_buffer = vec![0; num_bytes];
write(&mut temp_buffer[..]);
file.write_all(&temp_buffer[..]).unwrap();
*buf_pos = 0;
}
}
Addr(curr_addr)
}
fn write_bytes_atomic(&self, bytes: &[u8]) -> Addr {
if bytes.len() < 128 {
return self.write_atomic(bytes.len(), |sink| sink.copy_from_slice(bytes));
}
let mut data = self.data.lock();
let Inner {
ref mut file,
ref mut buffer,
ref mut buf_pos,
ref mut addr,
} = *data;
let curr_addr = *addr;
*addr += bytes.len() as u32;
if *buf_pos > 0 {
file.write_all(&buffer[..*buf_pos]).unwrap();
*buf_pos = 0;
}
file.write_all(bytes).unwrap();
Addr(curr_addr)
}
}
impl Drop for FileSerializationSink {
fn drop(&mut self) {
let mut data = self.data.lock();
let Inner {
ref mut file,
ref mut buffer,
ref mut buf_pos,
addr: _,
} = *data;
if *buf_pos > 0 {
file.write_all(&buffer[..*buf_pos]).unwrap();
}
}
}