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|
use crate::storage::*;
use std::collections::{HashMap, BTreeMap};
use std::ops::Bound::{Included, Unbounded, Excluded};
use std::sync::{Arc, RwLock};
/// This implementation is very inneficient, and not completely correct
/// Indeed, when the connector is dropped, the memory is freed.
/// It means that when a user disconnects, its data are lost.
/// It's intended only for basic debugging, do not use it for advanced tests...
pub type ArcRow = Arc<RwLock<HashMap<String, BTreeMap<String, Vec<u8>>>>>;
pub type ArcBlob = Arc<RwLock<HashMap<String, Vec<u8>>>>;
#[derive(Clone, Debug)]
pub struct MemBuilder {
user: String,
url: String,
row: ArcRow,
blob: ArcBlob,
}
impl IBuilder for MemBuilder {
fn build(&self) -> Box<dyn IStore> {
Box::new(MemStore {
row: self.row.clone(),
blob: self.blob.clone(),
})
}
}
pub struct MemStore {
row: ArcRow,
blob: ArcBlob,
}
impl MemStore {
fn inner_fetch(&self, row_ref: &RowRef) -> Result<Vec<u8>, StorageError> {
Ok(self.row
.read()
.or(Err(StorageError::Internal))?
.get(&row_ref.uid.shard)
.ok_or(StorageError::NotFound)?
.get(&row_ref.uid.sort)
.ok_or(StorageError::NotFound)?
.clone())
}
}
#[async_trait]
impl IStore for MemStore {
async fn row_fetch<'a>(&self, select: &Selector<'a>) -> Result<Vec<RowVal>, StorageError> {
match select {
Selector::Range { shard, sort_begin, sort_end } => {
Ok(self.row
.read()
.or(Err(StorageError::Internal))?
.get(*shard)
.ok_or(StorageError::NotFound)?
.range((Included(sort_begin.to_string()), Included(sort_end.to_string())))
.map(|(k, v)| RowVal {
row_ref: RowRef { uid: RowUid { shard: shard.to_string(), sort: k.to_string() }, causality: Some("c".to_string()) },
value: vec![Alternative::Value(v.clone())],
})
.collect::<Vec<_>>())
},
Selector::List(rlist) => {
let mut acc = vec![];
for row_ref in rlist {
let bytes = self.inner_fetch(row_ref)?;
let row_val = RowVal {
row_ref: row_ref.clone(),
value: vec![Alternative::Value(bytes)]
};
acc.push(row_val);
}
Ok(acc)
},
Selector::Prefix { shard, sort_prefix } => {
let mut sort_end = sort_prefix.to_string();
let last_bound = match sort_end.pop() {
None => Unbounded,
Some(ch) => {
let nc = char::from_u32(ch as u32 + 1).unwrap();
sort_end.push(nc);
Excluded(sort_end)
}
};
Ok(self.row
.read()
.or(Err(StorageError::Internal))?
.get(*shard)
.ok_or(StorageError::NotFound)?
.range((Included(sort_prefix.to_string()), last_bound))
.map(|(k, v)| RowVal {
row_ref: RowRef { uid: RowUid { shard: shard.to_string(), sort: k.to_string() }, causality: Some("c".to_string()) },
value: vec![Alternative::Value(v.clone())],
})
.collect::<Vec<_>>())
},
Selector::Single(row_ref) => {
let bytes = self.inner_fetch(row_ref)?;
Ok(vec![RowVal{ row_ref: row_ref.clone(), value: vec![Alternative::Value(bytes)]}])
}
}
}
async fn row_rm<'a>(&self, select: &Selector<'a>) -> Result<(), StorageError> {
unimplemented!();
}
async fn row_insert(&self, values: Vec<RowVal>) -> Result<(), StorageError> {
unimplemented!();
}
async fn row_poll(&self, value: RowRef) -> Result<RowVal, StorageError> {
unimplemented!();
}
async fn blob_fetch(&self, blob_ref: &BlobRef) -> Result<BlobVal, StorageError> {
unimplemented!();
}
async fn blob_copy(&self, src: &BlobRef, dst: &BlobRef) -> Result<BlobVal, StorageError> {
unimplemented!();
}
async fn blob_list(&self, prefix: &str) -> Result<Vec<BlobRef>, StorageError> {
unimplemented!();
}
async fn blob_rm(&self, blob_ref: &BlobRef) -> Result<(), StorageError> {
unimplemented!();
}
}
|
