apalis_sqlite/queries/
wait_for.rs

1use std::{collections::HashSet, str::FromStr, vec};
2
3use apalis_core::{
4    backend::{Backend, TaskResult, WaitForCompletion},
5    task::{
6        status::Status,
7        task_id::{TaskId, coalesce_ids},
8    },
9};
10use futures::{StreamExt, stream::BoxStream};
11
12use crate::{Error, SqliteStorage};
13
14#[derive(Debug)]
15struct ResultRow {
16    pub id: Option<String>,
17    pub status: Option<String>,
18    pub result: Option<String>,
19    pub attempt: Option<i64>,
20}
21
22impl<Args, O> WaitForCompletion<O> for SqliteStorage<Args>
23where
24    Self: Backend<Error = Error>,
25    O: Send + 'static + serde::de::DeserializeOwned,
26{
27    type ResultStream = BoxStream<'static, Result<TaskResult<O>, Self::Error>>;
28    fn wait_for(&self, task_ids: impl IntoIterator<Item = TaskId>) -> Self::ResultStream {
29        let pool = self.persistence.pool.clone();
30        let ids: HashSet<String> = task_ids.into_iter().map(|id| id.to_string()).collect();
31
32        let stream = futures::stream::unfold(ids, move |mut remaining_ids| {
33            let pool = pool.clone();
34            async move {
35                if remaining_ids.is_empty() {
36                    return None;
37                }
38
39                let ids_vec: Vec<String> = remaining_ids.iter().cloned().collect();
40                let ids_vec = coalesce_ids(ids_vec);
41                let rows = sqlx::query_file_as!(
42                    ResultRow,
43                    "queries/backend/fetch_completed_tasks.sql",
44                    ids_vec
45                )
46                .fetch_all(&pool)
47                .await
48                .ok()?;
49
50                if rows.is_empty() {
51                    apalis_core::timer::sleep(std::time::Duration::from_millis(500)).await;
52                    return Some((futures::stream::iter(vec![]), remaining_ids));
53                }
54
55                let mut results = Vec::new();
56                for row in rows {
57                    let task_id = row.id.clone().unwrap();
58                    remaining_ids.remove(&task_id);
59                    let result: Result<O, String> =
60                        serde_json::from_str(&row.result.unwrap()).unwrap();
61                    results.push(Ok(TaskResult {
62                        task_id: TaskId::from_str(&task_id).ok()?,
63                        status: Status::from_str(&row.status.unwrap()).ok()?,
64                        attempt: row.attempt.unwrap_or_default() as usize,
65                        result,
66                    }));
67                }
68
69                Some((futures::stream::iter(results), remaining_ids))
70            }
71        });
72        stream.flatten().boxed()
73    }
74
75    // Implementation of check_status
76    fn check_status(
77        &self,
78        task_ids: impl IntoIterator<Item = TaskId> + Send,
79    ) -> impl Future<Output = Result<Vec<TaskResult<O>>, Self::Error>> + Send {
80        let pool = self.persistence.pool.clone();
81
82        async move {
83            let ids = coalesce_ids(task_ids);
84            let rows =
85                sqlx::query_file_as!(ResultRow, "queries/backend/fetch_completed_tasks.sql", ids)
86                    .fetch_all(&pool)
87                    .await?;
88
89            let mut results = Vec::new();
90            for row in rows {
91                let task_id = TaskId::from_str(&row.id.unwrap()).map_err(Error::TaskIdError)?;
92
93                let result: Result<O, String> =
94                    serde_json::from_str(&row.result.unwrap()).map_err(Error::JsonError)?;
95
96                results.push(TaskResult {
97                    task_id,
98                    status: row.status.unwrap().parse().map_err(Error::StatusError)?,
99                    result,
100                    attempt: row.attempt.unwrap_or_default() as usize,
101                });
102            }
103
104            Ok(results)
105        }
106    }
107}
apalis_sqlite/queries/wait_for.rs

apalis_sqlite/queries/
wait_for.rs
