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mod bucket;
mod double_bucket;
mod fs_utils;
pub use bucket::Bucket;
pub use double_bucket::DoubleBucket;
use fs_utils::maxify;
use std::fmt::Debug;
use std::fs;
use std::path::{Path, PathBuf};
extern crate serde;
use serde::{de::DeserializeOwned, Serialize};
pub struct Fsdb {
dir: PathBuf,
}
pub trait FsBucket {}
#[derive(Debug, thiserror::Error)]
pub enum Error {
#[error("io error: {0}")]
Io(#[from] std::io::Error),
#[error("encode error: {0}")]
Encode(#[from] rmp_serde::encode::Error),
#[error("dncode error: {0}")]
Decode(#[from] rmp_serde::decode::Error),
}
type Result<T> = std::result::Result<T, Error>;
impl Fsdb {
pub fn new(dir: &str) -> Result<Self> {
if !Path::new(dir).exists() {
fs::create_dir_all(dir)?;
}
Ok(Self { dir: dir.into() })
}
pub fn bucket<V: Serialize + DeserializeOwned>(
&self,
p: &str,
max_file_name: Option<usize>,
) -> Result<Bucket<V>> {
let p2 = maxify(p, max_file_name);
Ok(Bucket::new(self.make_dir(&p2)?.into(), max_file_name))
}
pub fn double_bucket<V: Serialize + DeserializeOwned>(
&self,
p: &str,
max_file_name: Option<usize>,
) -> Result<DoubleBucket<V>> {
let p2 = maxify(p, max_file_name);
Ok(DoubleBucket::new(self.make_dir(&p2)?.into(), max_file_name))
}
fn make_dir(&self, p: &str) -> Result<PathBuf> {
let mut dir = self.dir.clone();
dir.push(p);
if !Path::new(&dir).exists() {
fs::create_dir(dir.clone())?;
}
Ok(dir)
}
}
#[cfg(test)]
mod tests {
use crate::Fsdb;
use serde::{Deserialize, Serialize};
#[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Clone)]
struct Thing {
n: u8,
}
#[test]
fn test_db() {
let db = Fsdb::new("testdb/db1").expect("fail Fsdb::new");
let b = db.bucket("hi1234567890", Some(8)).expect("fail bucket");
let t1 = Thing { n: 1 };
println!("PUT NOW");
b.put("keythatisverylong", t1.clone())
.expect("failed to save");
println!("PUTTED!");
let t2: Thing = b.get("keythatisverylong").expect("fail to load");
println!("GOTTEN");
println!("t {:?}", t2.clone());
assert_eq!(t1, t2);
let list = b.list().expect("fail list");
assert_eq!(list, vec!["keythati".to_string()]);
}
#[test]
fn test_double() {
let db = Fsdb::new("testdb/db2").expect("fail Fsdb::new");
let b = db.double_bucket("hi", None).expect("fail bucket");
let t1 = Thing { n: 1 };
b.put("sub1", "key", t1.clone()).expect("failed to save");
let t2: Thing = b.get("sub1", "key").expect("fail to load");
println!("t {:?}", t2.clone());
assert_eq!(t1, t2);
let list = b.list("sub1").expect("fail list");
assert_eq!(list, vec!["key".to_string()]);
}
}