sea_orm/database/stream/
query.rs

1#![allow(missing_docs, unreachable_code, unused_variables)]
2
3use futures_util::Stream;
4use std::{pin::Pin, task::Poll};
5use tracing::instrument;
6
7#[cfg(feature = "sqlx-dep")]
8use futures_util::TryStreamExt;
9
10#[cfg(feature = "sqlx-dep")]
11use sqlx::Executor;
12
13use super::metric::MetricStream;
14#[cfg(feature = "sqlx-dep")]
15use crate::driver::*;
16use crate::{DbErr, InnerConnection, QueryResult, Statement};
17
18/// Creates a stream from a [QueryResult]
19#[ouroboros::self_referencing]
20pub struct QueryStream {
21    stmt: Statement,
22    conn: InnerConnection,
23    metric_callback: Option<crate::metric::Callback>,
24    #[borrows(mut conn, stmt, metric_callback)]
25    #[not_covariant]
26    stream: MetricStream<'this>,
27}
28
29impl std::fmt::Debug for QueryStream {
30    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
31        write!(f, "QueryStream")
32    }
33}
34
35impl QueryStream {
36    #[instrument(level = "trace", skip(metric_callback))]
37    pub(crate) fn build(
38        stmt: Statement,
39        conn: InnerConnection,
40        metric_callback: Option<crate::metric::Callback>,
41    ) -> QueryStream {
42        QueryStreamBuilder {
43            stmt,
44            conn,
45            metric_callback,
46            stream_builder: |conn, stmt, _metric_callback| match conn {
47                #[cfg(feature = "sqlx-mysql")]
48                InnerConnection::MySql(c) => {
49                    let query = crate::driver::sqlx_mysql::sqlx_query(stmt);
50                    let _start = _metric_callback.is_some().then(std::time::SystemTime::now);
51                    let stream = c
52                        .fetch(query)
53                        .map_ok(Into::into)
54                        .map_err(sqlx_error_to_query_err);
55                    let elapsed = _start.map(|s| s.elapsed().unwrap_or_default());
56                    MetricStream::new(_metric_callback, stmt, elapsed, stream)
57                }
58                #[cfg(feature = "sqlx-postgres")]
59                InnerConnection::Postgres(c) => {
60                    let query = crate::driver::sqlx_postgres::sqlx_query(stmt);
61                    let _start = _metric_callback.is_some().then(std::time::SystemTime::now);
62                    let stream = c
63                        .fetch(query)
64                        .map_ok(Into::into)
65                        .map_err(sqlx_error_to_query_err);
66                    let elapsed = _start.map(|s| s.elapsed().unwrap_or_default());
67                    MetricStream::new(_metric_callback, stmt, elapsed, stream)
68                }
69                #[cfg(feature = "sqlx-sqlite")]
70                InnerConnection::Sqlite(c) => {
71                    let query = crate::driver::sqlx_sqlite::sqlx_query(stmt);
72                    let _start = _metric_callback.is_some().then(std::time::SystemTime::now);
73                    let stream = c
74                        .fetch(query)
75                        .map_ok(Into::into)
76                        .map_err(sqlx_error_to_query_err);
77                    let elapsed = _start.map(|s| s.elapsed().unwrap_or_default());
78                    MetricStream::new(_metric_callback, stmt, elapsed, stream)
79                }
80                #[cfg(feature = "mock")]
81                InnerConnection::Mock(c) => {
82                    let _start = _metric_callback.is_some().then(std::time::SystemTime::now);
83                    let stream = c.fetch(stmt);
84                    let elapsed = _start.map(|s| s.elapsed().unwrap_or_default());
85                    MetricStream::new(_metric_callback, stmt, elapsed, stream)
86                }
87                #[cfg(feature = "proxy")]
88                InnerConnection::Proxy(c) => {
89                    todo!("Proxy connection is not supported")
90                }
91                #[allow(unreachable_patterns)]
92                _ => unreachable!(),
93            },
94        }
95        .build()
96    }
97}
98
99impl Stream for QueryStream {
100    type Item = Result<QueryResult, DbErr>;
101
102    fn poll_next(
103        self: Pin<&mut Self>,
104        cx: &mut std::task::Context<'_>,
105    ) -> Poll<Option<Self::Item>> {
106        let this = self.get_mut();
107        this.with_stream_mut(|stream| Pin::new(stream).poll_next(cx))
108    }
109}
sea_orm/database/stream/query.rs

sea_orm/database/stream/
query.rs
