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|
use anyhow::Result;
use futures_util::{StreamExt, stream::FuturesUnordered};
use log::{debug, info};
use redb::{Database, Durability, TableDefinition};
use std::{
fs::create_dir_all,
path::{Path, PathBuf},
sync::atomic::{AtomicUsize, Ordering},
};
use tokio::{
fs::File,
io::{AsyncReadExt, AsyncWriteExt},
};
pub enum Cache {
Directory(PathBuf),
Redb { db: Database, counter: AtomicUsize },
}
const T_DOWNLOAD: TableDefinition<&str, &[u8]> = TableDefinition::new("dl");
impl Cache {
pub fn new_directory() -> Result<Self> {
let cachedir = xdg::BaseDirectories::with_prefix("weareearth")
.unwrap()
.create_cache_directory("download")
.unwrap();
create_dir_all(cachedir.join("BulkMetadata"))?;
create_dir_all(cachedir.join("NodeData"))?;
Ok(Self::Directory(cachedir))
}
pub fn new_db(path: &Path) -> Result<Self> {
info!("opening db...");
let db = Database::create(path)?;
info!("done");
{
let txn = db.begin_write()?;
txn.open_table(T_DOWNLOAD)?;
txn.commit()?;
}
Ok(Self::Redb {
db,
counter: AtomicUsize::new(0),
})
}
pub async fn transfer_entries(&self, other: &Cache) -> Result<()> {
match self {
Cache::Directory(path) => {
let mut fu = FuturesUnordered::new();
let mut counter = 0;
for dir in ["NodeData", "BulkMetadata"] {
info!("entering {dir:?}");
for f in path.join(dir).read_dir()? {
let f = f?;
if fu.len() > 128 {
if let Some(x) = fu.next().await {
x?
};
}
counter += 1;
if counter % 1_000 == 0 {
debug!("{counter} items copied");
}
fu.push(async move {
let mut buf = Vec::new();
File::open(f.path()).await?.read_to_end(&mut buf).await?;
other
.insert(&format!("{dir}/{}", f.file_name().to_string_lossy()), &buf)
.await?;
Ok::<_, anyhow::Error>(())
});
}
}
while let Some(x) = fu.next().await {
x?
}
info!("transfer done");
}
_ => unimplemented!(),
}
Ok(())
}
pub async fn get(&self, path: &str) -> Result<Option<Vec<u8>>> {
match self {
Cache::Directory(cachedir) => {
let cachepath = cachedir.join(path);
if cachepath.exists() {
let mut buf = Vec::new();
File::open(cachepath).await?.read_to_end(&mut buf).await?;
Ok(Some(buf.into()))
} else {
Ok(None)
}
}
Cache::Redb { db, .. } => {
let txn = db.begin_read()?;
let table = txn.open_table(T_DOWNLOAD)?;
let res = table.get(path)?;
if let Some(res) = res {
Ok(Some(res.value().to_vec()))
} else {
Ok(None)
}
}
}
}
pub async fn insert(&self, path: &str, data: &[u8]) -> Result<()> {
match self {
Cache::Directory(cachedir) => {
let cachepath = cachedir.join(path);
File::create(cachepath).await?.write_all(data).await?;
Ok(())
}
Cache::Redb { db, counter } => {
let n = counter.fetch_add(1, Ordering::Relaxed);
let mut txn = db.begin_write()?;
if n % 100_000 == 0 {
info!("flushing db");
txn.set_durability(Durability::Immediate);
txn.set_quick_repair(true);
} else {
txn.set_durability(Durability::None)
};
let mut table = txn.open_table(T_DOWNLOAD)?;
table.insert(path, data)?;
drop(table);
txn.commit()?;
Ok(())
}
}
}
}
|
