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use std::os::unix::io::RawFd;
use nix::unistd::{close, mkdir, unlinkat, UnlinkatFlags, ftruncate};
use nix::fcntl::{open, openat, OFlag, fallocate, FallocateFlags};
use nix::sys::{stat::Mode, uio::{pwrite, pread}};
use rand::{Rng, seq::SliceRandom};
use libc::off_t;
use growthring::wal::{WALFile, WALStore, WALPos, WALBytes, WALLoader, WALWriter, WALRingId};
struct WALFileTest {
filename: String,
fd: RawFd,
}
impl WALFileTest {
fn new(rootfd: RawFd, filename: &str) -> Result<Self, ()> {
openat(rootfd, filename,
OFlag::O_CREAT | OFlag::O_RDWR,
Mode::S_IRUSR | Mode::S_IWUSR).and_then(|fd| {
let filename = filename.to_string();
Ok (WALFileTest {
filename,
fd,
})
}).or_else(|_| Err(()))
}
}
impl Drop for WALFileTest {
fn drop(&mut self) {
close(self.fd).unwrap();
}
}
impl WALFile for WALFileTest {
fn allocate(&self, offset: WALPos, length: usize) -> Result<(), ()> {
println!("{}.allocate(offset=0x{:x}, end=0x{:x})", self.filename, offset, offset + length as u64);
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<(), ()> {
println!("{}.truncate(length={})", self.filename, length);
ftruncate(self.fd, length as off_t).or_else(|_| Err(()))
}
fn write(&self, offset: WALPos, data: WALBytes) -> Result<(), ()> {
println!("{}.write(offset=0x{:x}, end=0x{:x}, data=0x{})",
self.filename, offset, offset + data.len() as u64, hex::encode(&data));
pwrite(self.fd, &*data, offset as off_t)
.or_else(|_| Err(()))
.and_then(|nwrote| if nwrote == data.len() { Ok(()) } else { Err(()) })
}
fn read(&self, offset: WALPos, length: usize) -> Result<Option<WALBytes>, ()> {
let mut buff = Vec::new();
buff.resize(length, 0);
pread(self.fd, &mut buff[..], offset as off_t)
.or_else(|_| Err(()))
.and_then(|nread| Ok(if nread == length {Some(buff.into_boxed_slice())} else {None}))
}
}
struct WALStoreTest {
rootfd: RawFd,
rootpath: String
}
impl WALStoreTest {
fn new(wal_dir: &str, truncate: bool) -> Self {
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 DB")
};
WALStoreTest { rootfd, rootpath }
}
}
impl Drop for WALStoreTest {
fn drop(&mut self) {
close(self.rootfd).unwrap();
}
}
impl WALStore for WALStoreTest {
type FileNameIter = std::vec::IntoIter<String>;
fn open_file(&mut self, filename: &str, touch: bool) -> Result<Box<dyn WALFile>, ()> {
println!("open_file(filename={}, touch={})", filename, touch);
let filename = filename.to_string();
WALFileTest::new(self.rootfd, &filename).and_then(|f| Ok(Box::new(f) as Box<dyn WALFile>))
}
fn remove_file(&mut self, filename: &str) -> Result<(), ()> {
println!("remove_file(filename={})", filename);
unlinkat(Some(self.rootfd), filename, UnlinkatFlags::NoRemoveDir).or_else(|_| Err(()))
}
fn enumerate_files(&self) -> Result<Self::FileNameIter, ()> {
println!("enumerate_files()");
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(&mut self, payload: WALBytes, wal_off: WALPos) -> Result<(), ()> {
println!("apply_payload(payload={}, wal_off={})",
std::str::from_utf8(&payload).unwrap(),
wal_off);
Ok(())
}
}
fn test(records: Vec<String>, wal: &mut WALWriter<WALStoreTest>) -> Box<[WALRingId]> {
let records: Vec<WALBytes> = records.into_iter().map(|s| s.into_bytes().into_boxed_slice()).collect();
let ret = wal.grow(&records).unwrap();
for ring_id in ret.iter() {
println!("got ring id: {:?}", ring_id);
}
ret
}
fn main() {
let mut rng = rand::thread_rng();
let store = WALStoreTest::new("./wal_demo1", true);
let mut wal = WALLoader::new(store, 9, 8, 1000).recover().unwrap();
for _ in 0..3 {
test(["hi", "hello", "lol"].iter().map(|s| s.to_string()).collect::<Vec<String>>(), &mut wal);
}
for _ in 0..3 {
test(vec!["a".repeat(10), "b".repeat(100), "c".repeat(1000)], &mut wal);
}
let store = WALStoreTest::new("./wal_demo1", false);
let mut wal = WALLoader::new(store, 9, 8, 1000).recover().unwrap();
for _ in 0..3 {
test(vec!["a".repeat(10), "b".repeat(100), "c".repeat(300), "d".repeat(400)], &mut wal);
}
let store = WALStoreTest::new("./wal_demo1", false);
let mut wal = WALLoader::new(store, 9, 8, 1000).recover().unwrap();
for _ in 0..3 {
let mut ids = Vec::new();
for _ in 0..3 {
let mut records = Vec::new();
for _ in 0..100 {
records.push("a".repeat(rng.gen_range(1, 10)))
}
for id in test(records, &mut wal).iter() {
ids.push(*id)
}
}
ids.shuffle(&mut rng);
for e in ids.chunks(20) {
println!("peel(20)");
wal.peel(e);
}
}
}
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