tank_postgres/
transaction.rs

1use crate::{
2    PostgresConnection, PostgresDriver, PostgresPrepared, ValueWrap,
3    util::stream_postgres_row_to_tank_row,
4};
5use std::mem;
6use tank_core::{
7    AsQuery, Error, Executor, Query, QueryResult, Result, Transaction,
8    future::{Either, TryFutureExt},
9    stream::{Stream, TryStreamExt},
10};
11
12/// Transaction wrapper for Postgres databases.
13///
14/// Implements `Executor` and `Transaction` to allow using a Postgres transaction via the `tank_core` abstractions.
15pub struct PostgresTransaction<'c>(pub(crate) tokio_postgres::Transaction<'c>);
16
17impl<'c> PostgresTransaction<'c> {
18    pub async fn new(client: &'c mut PostgresConnection) -> Result<Self> {
19        Ok(Self(client.client.transaction().await.map_err(|e| {
20            log::error!("{:#}", e);
21            e
22        })?))
23    }
24}
25
26impl<'c> Executor for PostgresTransaction<'c> {
27    type Driver = PostgresDriver;
28
29    async fn prepare(&mut self, query: String) -> Result<Query<Self::Driver>> {
30        Ok(
31            PostgresPrepared::new(self.0.prepare(&query).await.map_err(|e| {
32                let error = Error::new(e);
33                log::error!("{:#}", error);
34                error
35            })?)
36            .into(),
37        )
38    }
39    fn run<'s>(
40        &'s mut self,
41        query: impl AsQuery<Self::Driver> + 's,
42    ) -> impl Stream<Item = Result<QueryResult>> + Send {
43        let mut query = query.as_query();
44        let mut owned = mem::take(query.as_mut());
45        stream_postgres_row_to_tank_row(async move || match &mut owned {
46            Query::Raw(sql) => {
47                let stream = self.0.query_raw(sql, Vec::<ValueWrap>::new()).await?;
48                Ok(Either::Left(stream))
49            }
50            Query::Prepared(prepared) => {
51                let params = prepared.take_params();
52                let portal = self
53                    .0
54                    .bind_raw(&prepared.statement, params.into_iter())
55                    .await?;
56                Ok(Either::Right(self.0.query_portal_raw(&portal, 0).await?))
57            }
58        })
59        .map_err(|e| {
60            log::error!("{:#}", e);
61            e
62        })
63    }
64}
65
66impl<'c> Transaction<'c> for PostgresTransaction<'c> {
67    fn commit(self) -> impl Future<Output = Result<()>> {
68        self.0.commit().map_err(|e| {
69            let e = Error::new(e);
70            log::error!("{:#}", e);
71            e
72        })
73    }
74
75    fn rollback(self) -> impl Future<Output = Result<()>> {
76        self.0.rollback().map_err(|e| {
77            let e = Error::new(e);
78            log::error!("{:#}", e);
79            e
80        })
81    }
82}
tank_postgres/transaction.rs

tank_postgres/
transaction.rs
