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
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88

pub mod corruptabledb;
pub mod errors;
pub mod iterator;
pub mod manager;
pub mod memdb;
pub mod nodb;
pub mod rpcdb;

use std::io::Result;

use crate::subnet::rpc::health::Checkable;

use num_derive::{FromPrimitive, ToPrimitive};

pub const MAX_BATCH_SIZE: usize = 128 * 1000;

#[tonic::async_trait]
pub trait Closer {
    async fn close(&self) -> Result<()>;
}

#[tonic::async_trait]
pub trait Database:
    CloneBox + KeyValueReaderWriterDeleter + Closer + Checkable + iterator::Iteratee
{
}

/// Helper type which defines a thread safe boxed Database interface.
pub type BoxedDatabase = Box<dyn Database + Send + Sync + 'static>;

/// ref. <https://pkg.go.dev/github.com/ava-labs/avalanchego/database#KeyValueReaderWriterDeleter>
#[tonic::async_trait]
pub trait KeyValueReaderWriterDeleter {
    async fn has(&self, key: &[u8]) -> Result<bool>;
    async fn get(&self, key: &[u8]) -> Result<Vec<u8>>;
    async fn put(&mut self, key: &[u8], value: &[u8]) -> Result<()>;
    async fn delete(&mut self, key: &[u8]) -> Result<()>;
}

pub trait CloneBox {
    /// Returns a Boxed clone of the underlying Database.
    fn clone_box(&self) -> BoxedDatabase;
}

impl<T> CloneBox for T
where
    T: 'static + Database + Clone + Send + Sync,
{
    fn clone_box(&self) -> BoxedDatabase {
        Box::new(self.clone())
    }
}

impl Clone for BoxedDatabase {
    fn clone(&self) -> BoxedDatabase {
        self.clone_box()
    }
}

#[tonic::async_trait]
pub trait VersionedDatabase {
    async fn close(&mut self) -> Result<()>;
}

/// ref. <https://pkg.go.dev/github.com/ava-labs/avalanchego/database#ErrClosed>
#[derive(Copy, Clone, Debug, FromPrimitive, ToPrimitive)]
pub enum DatabaseError {
    None = 0,
    Closed,
    NotFound,
}

#[tokio::test]
async fn clone_box_test() {
    // create box and mutate underlying hashmap
    let mut db = memdb::Database::new();
    let resp = db.put("foo".as_bytes(), "bar".as_bytes()).await;
    assert!(!resp.is_err());

    // clone and mutate
    let mut cloned_db = db.clone();
    let resp = cloned_db.delete("foo".as_bytes()).await;
    assert!(!resp.is_err());

    // verify mutation
    let resp = cloned_db.get("foo".as_bytes()).await;
    assert!(resp.is_err());
}