selene-core 0.4.2

selene-core is the backend for Selene, a local-first music player
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55

use std::convert::Infallible;

use lunar_lib::database::{
    CompareAndSwapTransaction, CustomTransactionError, DatabaseEntry, DatabaseError,
    TransactionError, Tree,
};

use crate::{
    database::{Createable, LibraryDb, collection_tree},
    library::collection::{Collection, CollectionId},
};

impl DatabaseEntry for Collection {
    type Id = CollectionId;
    type EntryDb = LibraryDb;

    const VERSION_NUMBER: u32 = 1;

    fn tree(db: &Self::EntryDb) -> Tree {
        collection_tree(db)
    }

    fn id(&self) -> Self::Id {
        self.id
    }

    fn read_only(&self) -> bool {
        self.read_only
    }
}

#[derive(Debug, Clone)]
pub struct CollectionCreateArgs {
    name: String,
}

impl Createable for Collection {
    type CreateArgs = CollectionCreateArgs;
    type Err = Infallible;

    fn tx_create(
        cas_tx: &mut CompareAndSwapTransaction<Self::EntryDb>,
        args: Self::CreateArgs,
    ) -> Result<Self, CustomTransactionError<Self::Err>> {
        let collection = Collection::new_static(args.name).map_err(|err| {
            TransactionError::Database(DatabaseError::InvalidInput(err.to_string()))
        })?;

        if cas_tx.tx_get(collection.id())?.is_some() {
            return Err(TransactionError::Database(DatabaseError::AlreadyInDatabase).into());
        }

        Ok(collection)
    }
}