cartel-pg 0.23.1

Async PostgreSQL driver for the dope runtime
Documentation 
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
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140

use crate::reply::Error;
use crate::{api::Response, port::replies};
use crate::{api::task, schema};
use cartel_core::reply;
use dope::core::driver::schedule::clock::timer;
use dope_fiber::{abi, context, wait};
use reply::recv;
use std::{pin, task::Poll};

/// Projects a completed reply after its original call has released its resources.
#[pin_project::pin_project]
pub(in crate::api) struct Map<F, M> {
    #[pin]
    task: abi::Task<F>,
    map: M,
}

impl<F, M> Map<F, M> {
    pub(in crate::api) const fn new(fiber: F, map: M) -> Self {
        Self {
            task: abi::Task::new(fiber),
            map,
        }
    }
}

impl<'d, F: abi::Fiber<'d>, M, T> abi::Fiber<'d> for Map<F, M>
where
    M: FnMut(F::Output) -> T,
{
    type Output = T;

    fn poll(call: context::PollCall<'_, '_, 'd, Self>) -> Poll<T> {
        let (this, admit) = call.into_admit();
        let this = this.project();
        admit.poll(this.task).0.map(this.map)
    }
}

#[pin_project::pin_project]
pub struct Call<'app, 'g, 'r, 's, 'b, 'c, 'd: 'app, B: ?Sized, I, X, const ID: u8>
where
    I: schema::QuerySet + 'd,
    X: recv::Extract<'app, 'b, 'c, 'd, replies::Row<'d>, replies::ReplyFailure<'d>>,
{
    core: task::Core<
        'app,
        'g,
        'r,
        's,
        'b,
        'c,
        'd,
        B,
        I,
        Response<'app, 'g, 'r, 's, 'b, 'c, 'd, X>,
        ID,
    >,
    #[pin]
    deadline: Result<timer::Alarm<'d>, timer::Exhausted>,
    #[pin]
    waiter: wait::Waiter<'app, 'd>,
}

impl<'app, 'g, 'r, 's, 'b, 'c, 'd: 'app, B: ?Sized, I, X, const ID: u8>
    Call<'app, 'g, 'r, 's, 'b, 'c, 'd, B, I, X, ID>
where
    I: schema::QuerySet + 'd,
    X: recv::Extract<'app, 'b, 'c, 'd, replies::Row<'d>, replies::ReplyFailure<'d>>,
{
    pub(in crate::api) fn from_core(
        core: task::Core<
            'app,
            'g,
            'r,
            's,
            'b,
            'c,
            'd,
            B,
            I,
            Response<'app, 'g, 'r, 's, 'b, 'c, 'd, X>,
            ID,
        >,
    ) -> Self {
        let guard = core.guard();
        Self {
            core,
            deadline: guard,
            waiter: wait::Waiter::new(),
        }
    }
}

impl<'app, 'g, 'r, 's, 'b, 'c, 'd: 'app, B: ?Sized, I, T, X, const ID: u8> abi::Fiber<'d>
    for Call<'app, 'g, 'r, 's, 'b, 'c, 'd, B, I, X, ID>
where
    I: schema::QuerySet + 'd,
    X: recv::Extract<
            'app,
            'b,
            'c,
            'd,
            replies::Row<'d>,
            replies::ReplyFailure<'d>,
            Output = Result<T, Error<'d, ID>>,
        >,
{
    type Output = Result<T, Error<'d, ID>>;

    fn poll(call: context::PollCall<'_, '_, 'd, Self>) -> Poll<Self::Output> {
        let (this, mut cx) = call.into_parts();
        let mut this = this.project();
        let mut guard = match this.deadline.as_mut().get_mut() {
            Ok(guard) => pin::Pin::new(guard),
            Err(error) => {
                this.waiter.as_ref().unregister();
                return Poll::Ready(Err(this.core.no_timer(*error)));
            }
        };
        let phase = this.core.phase();
        if let Poll::Ready(time) = this.core.poll_time(guard.as_mut(), cx.as_mut(), phase) {
            this.waiter.as_ref().unregister();
            return Poll::Ready(Err(this.core.expire(time)));
        }
        let next =
            match this
                .core
                .poll_done(cx.as_mut(), this.waiter.as_ref(), task::lease::Lease::admit)
            {
                Poll::Pending => Poll::Pending,
                Poll::Ready(task::Done::AdmissionFailed(error)) => Poll::Ready(Err(error)),
                Poll::Ready(task::Done::Response { outcome, .. }) => Poll::Ready(outcome),
            };
        if next.is_ready() {
            guard.as_ref().clear();
        }
        next
    }
}