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#[macro_use] extern crate scan_fmt;
pub mod wal;
use async_trait::async_trait;
use futures::executor::block_on;
use libaiofut::{new_batch_scheduler, AIOBatchSchedulerIn, AIOManager};
use libc::off_t;
use nix::fcntl::{fallocate, open, openat, FallocateFlags, OFlag};
use nix::sys::stat::Mode;
use nix::unistd::{close, ftruncate, mkdir, unlinkat, UnlinkatFlags};
use std::cell::RefCell;
use std::os::unix::io::RawFd;
use std::rc::Rc;
use wal::{WALBytes, WALFile, WALPos, WALRingId, WALStore};
pub struct WALFileAIO {
fd: RawFd,
aiomgr: Rc<RefCell<AIOManager<AIOBatchSchedulerIn>>>,
}
impl WALFileAIO {
pub fn new(
rootfd: RawFd,
filename: &str,
aiomgr: Rc<RefCell<AIOManager<AIOBatchSchedulerIn>>>,
) -> Result<Self, ()> {
openat(
rootfd,
filename,
OFlag::O_CREAT | OFlag::O_RDWR,
Mode::S_IRUSR | Mode::S_IWUSR,
)
.and_then(|fd| Ok(WALFileAIO { fd, aiomgr }))
.or_else(|_| Err(()))
}
}
impl Drop for WALFileAIO {
fn drop(&mut self) {
close(self.fd).unwrap();
}
}
#[async_trait(?Send)]
impl WALFile for WALFileAIO {
async fn allocate(&self, offset: WALPos, length: usize) -> Result<(), ()> {
// TODO: is there any async version of fallocate?
fallocate(
self.fd,
FallocateFlags::FALLOC_FL_ZERO_RANGE,
offset as off_t,
length as off_t,
)
.and_then(|_| Ok(()))
.or_else(|_| Err(()))
}
fn truncate(&self, length: usize) -> Result<(), ()> {
ftruncate(self.fd, length as off_t).or_else(|_| Err(()))
}
async fn write(&self, offset: WALPos, data: WALBytes) -> Result<(), ()> {
self.aiomgr
.borrow_mut()
.write(self.fd, offset, data, None)
.await
.or_else(|_| Err(()))
.and_then(|(nwrote, data)| {
if nwrote == data.len() {
Ok(())
} else {
Err(())
}
})
}
fn read(
&self,
offset: WALPos,
length: usize,
) -> Result<Option<WALBytes>, ()> {
block_on(self.aiomgr.borrow_mut().read(self.fd, offset, length, None))
.or_else(|_| Err(()))
.and_then(|(nread, data)| {
Ok(if nread == length { Some(data) } else { None })
})
}
}
pub struct WALStoreAIO<F: FnMut(WALBytes, WALRingId) -> Result<(), ()>> {
rootfd: RawFd,
rootpath: String,
recover_func: RefCell<F>,
}
impl<F: FnMut(WALBytes, WALRingId) -> Result<(), ()>> WALStoreAIO<F> {
pub fn new(wal_dir: &str, truncate: bool, recover_func: F) -> Self {
let recover_func = RefCell::new(recover_func);
let rootpath = wal_dir.to_string();
if truncate {
let _ = std::fs::remove_dir_all(wal_dir);
}
match mkdir(wal_dir, Mode::S_IRUSR | Mode::S_IWUSR | Mode::S_IXUSR) {
Err(e) => {
if truncate {
panic!("error while creating directory: {}", e)
}
}
Ok(_) => (),
}
let rootfd = match open(
wal_dir,
OFlag::O_DIRECTORY | OFlag::O_PATH,
Mode::empty(),
) {
Ok(fd) => fd,
Err(_) => panic!("error while opening the WAL directory"),
};
WALStoreAIO {
rootfd,
rootpath,
recover_func,
}
}
}
#[async_trait(?Send)]
impl<F: FnMut(WALBytes, WALRingId) -> Result<(), ()>> WALStore
for WALStoreAIO<F>
{
type FileNameIter = std::vec::IntoIter<String>;
async fn open_file(
&self,
filename: &str,
_touch: bool,
) -> Result<Box<dyn WALFile>, ()> {
let filename = filename.to_string();
let aiomgr = Rc::new(RefCell::new(
AIOManager::new(new_batch_scheduler(None), 10, None, None)
.or(Err(()))?,
));
WALFileAIO::new(self.rootfd, &filename, aiomgr.clone())
.and_then(|f| Ok(Box::new(f) as Box<dyn WALFile>))
}
async fn remove_file(&self, filename: String) -> Result<(), ()> {
unlinkat(
Some(self.rootfd),
filename.as_str(),
UnlinkatFlags::NoRemoveDir,
)
.or_else(|_| Err(()))
}
fn enumerate_files(&self) -> Result<Self::FileNameIter, ()> {
let mut logfiles = Vec::new();
for fname in std::fs::read_dir(&self.rootpath).unwrap() {
logfiles.push(fname.unwrap().file_name().into_string().unwrap())
}
Ok(logfiles.into_iter())
}
fn apply_payload(
&self,
payload: WALBytes,
ringid: WALRingId,
) -> Result<(), ()> {
(&mut *self.recover_func.borrow_mut())(payload, ringid)
}
}
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