testkit_core/
context.rs

1use async_trait::async_trait;
2use std::fmt::Debug;
3use std::marker::PhantomData;
4
5use crate::testdb::{
6    DatabaseBackend, DatabasePool, TestDatabaseConnection,
7    transaction::{DBTransactionManager, DatabaseTransaction},
8};
9
10use crate::TestContext;
11
12/// A helper trait to simplify type constraints
13pub trait TransactionStarter<DB: DatabaseBackend> {
14    /// The transaction type
15    type Transaction: DatabaseTransaction<Error = DB::Error> + Send + Sync + 'static;
16    /// The connection type
17    type Connection: TestDatabaseConnection + Send + Sync + 'static;
18
19    /// Begin a transaction
20    fn begin_transaction_type() -> Self::Transaction;
21}
22
23// Implement TransactionStarter with DB-specific transaction types
24impl<DB> TransactionStarter<DB> for TestContext<DB>
25where
26    DB: DatabaseBackend + Send + Sync + Debug + 'static,
27{
28    // Implementation details are hidden using a type from the backend
29    type Transaction = MockTransactionFor<DB>;
30    type Connection = MockConnectionFor<DB>;
31
32    fn begin_transaction_type() -> Self::Transaction {
33        // This is just for type inference, not actually used
34        panic!("This method should never be called")
35    }
36}
37
38// These are placeholder types to satisfy the compiler
39// In a real implementation, you would use actual transaction types from your backend
40pub struct MockTransactionFor<DB: DatabaseBackend>(PhantomData<DB>);
41pub struct MockConnectionFor<DB: DatabaseBackend>(PhantomData<DB>);
42
43// Implement the necessary traits for these types
44#[async_trait]
45impl<DB: DatabaseBackend> DatabaseTransaction for MockTransactionFor<DB> {
46    type Error = DB::Error;
47
48    async fn commit(&mut self) -> Result<(), Self::Error> {
49        // Mock implementation
50        Ok(())
51    }
52
53    async fn rollback(&mut self) -> Result<(), Self::Error> {
54        // Mock implementation
55        Ok(())
56    }
57}
58
59impl<DB: DatabaseBackend> TestDatabaseConnection for MockConnectionFor<DB> {
60    fn connection_string(&self) -> String {
61        "mock".to_string()
62    }
63}
64
65// We need an associated type to represent the transaction type
66#[async_trait]
67impl<DB, T, Conn> DBTransactionManager<T, Conn> for TestContext<DB>
68where
69    DB: DatabaseBackend + Send + Sync + Debug + 'static,
70    T: DatabaseTransaction<Error = DB::Error> + Send + Sync + 'static,
71    Conn: TestDatabaseConnection + Send + Sync + 'static,
72    DB::Pool: DatabasePool<Connection = Conn, Error = DB::Error>,
73{
74    type Error = DB::Error;
75    type Tx = T;
76
77    /// Begin a new transaction
78    async fn begin_transaction(&mut self) -> Result<Self::Tx, Self::Error> {
79        // This needs to be implemented for your specific transaction type
80        // For example with a PostgreSQL backend, you might do:
81        // let conn = self.db.acquire_connection().await?;
82        // let tx = conn.begin().await?;
83        // Ok(tx)
84
85        // As a placeholder, we'll return an error
86        Err(From::from(
87            "Transaction implementation is database-specific and must be provided for each backend"
88                .to_string(),
89        ))
90    }
91
92    /// Commit a transaction
93    async fn commit_transaction(tx: &mut Self::Tx) -> Result<(), Self::Error> {
94        tx.commit().await
95    }
96
97    /// Rollback a transaction
98    async fn rollback_transaction(tx: &mut Self::Tx) -> Result<(), Self::Error> {
99        tx.rollback().await
100    }
101}
testkit_core/context.rs

testkit_core/
context.rs
