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
141
142
143
144

// Copyright 2013-2018, The Gtk-rs Project Developers.
// See the COPYRIGHT file at the top-level directory of this distribution.
// Licensed under the MIT license, see the LICENSE file or <http://opensource.org/licenses/MIT>

use fragile::Fragile;
use gio_sys;
use glib;
use glib::object::{Cast, IsA};
use glib::translate::*;
use glib_sys;
use std::cell::RefCell;
use std::mem::transmute;
use Cancellable;
use PollableOutputStream;

#[cfg(feature = "futures")]
use futures::future::Future;
#[cfg(feature = "futures")]
use futures::stream::Stream;

pub trait PollableOutputStreamExtManual {
    fn create_source<F>(
        &self,
        cancellable: Option<&Cancellable>,
        name: Option<&str>,
        priority: glib::Priority,
        func: F,
    ) -> glib::Source
    where
        F: FnMut(&Self) -> glib::Continue + 'static;

    #[cfg(feature = "futures")]
    fn create_source_future(
        &self,
        cancellable: Option<&Cancellable>,
        priority: glib::Priority,
    ) -> Box<dyn Future<Output = ()> + std::marker::Unpin>;

    #[cfg(feature = "futures")]
    fn create_source_stream(
        &self,
        cancellable: Option<&Cancellable>,
        priority: glib::Priority,
    ) -> Box<dyn Stream<Item = ()> + std::marker::Unpin>;
}

impl<O: IsA<PollableOutputStream>> PollableOutputStreamExtManual for O {
    fn create_source<F>(
        &self,
        cancellable: Option<&Cancellable>,
        name: Option<&str>,
        priority: glib::Priority,
        func: F,
    ) -> glib::Source
    where
        F: FnMut(&Self) -> glib::Continue + 'static,
    {
        #[cfg_attr(feature = "cargo-clippy", allow(transmute_ptr_to_ref))]
        unsafe extern "C" fn trampoline<O: IsA<PollableOutputStream>>(
            stream: *mut gio_sys::GPollableOutputStream,
            func: glib_sys::gpointer,
        ) -> glib_sys::gboolean {
            let func: &Fragile<RefCell<Box<dyn FnMut(&O) -> glib::Continue + 'static>>> =
                transmute(func);
            let func = func.get();
            let mut func = func.borrow_mut();
            (&mut *func)(&PollableOutputStream::from_glib_borrow(stream).unsafe_cast()).to_glib()
        }
        unsafe extern "C" fn destroy_closure<O>(ptr: glib_sys::gpointer) {
            Box::<Fragile<RefCell<Box<dyn FnMut(&O) -> glib::Continue + 'static>>>>::from_raw(
                ptr as *mut _,
            );
        }
        let cancellable = cancellable.to_glib_none();
        unsafe {
            let source = gio_sys::g_pollable_output_stream_create_source(
                self.as_ref().to_glib_none().0,
                cancellable.0,
            );

            let trampoline = trampoline::<Self> as glib_sys::gpointer;
            glib_sys::g_source_set_callback(
                source,
                Some(transmute(trampoline)),
                into_raw(func),
                Some(destroy_closure::<Self>),
            );
            glib_sys::g_source_set_priority(source, priority.to_glib());

            if let Some(name) = name {
                glib_sys::g_source_set_name(source, name.to_glib_none().0);
            }

            from_glib_full(source)
        }
    }

    #[cfg(feature = "futures")]
    fn create_source_future(
        &self,
        cancellable: Option<&Cancellable>,
        priority: glib::Priority,
    ) -> Box<dyn Future<Output = ()> + std::marker::Unpin> {
        let cancellable: Option<Cancellable> = cancellable.cloned();

        let obj = Fragile::new(self.clone());
        Box::new(glib::SourceFuture::new(move |send| {
            let mut send = Some(send);
            obj.get()
                .create_source(cancellable.as_ref(), None, priority, move |_| {
                    let _ = send.take().unwrap().send(());
                    glib::Continue(false)
                })
        }))
    }

    #[cfg(feature = "futures")]
    fn create_source_stream(
        &self,
        cancellable: Option<&Cancellable>,
        priority: glib::Priority,
    ) -> Box<dyn Stream<Item = ()> + std::marker::Unpin> {
        let cancellable: Option<Cancellable> = cancellable.cloned();

        let obj = Fragile::new(self.clone());
        Box::new(glib::SourceStream::new(move |send| {
            let send = Some(send);
            obj.get()
                .create_source(cancellable.as_ref(), None, priority, move |_| {
                    if send.as_ref().unwrap().unbounded_send(()).is_err() {
                        glib::Continue(false)
                    } else {
                        glib::Continue(true)
                    }
                })
        }))
    }
}

fn into_raw<O, F: FnMut(&O) -> glib::Continue + 'static>(func: F) -> glib_sys::gpointer {
    let func: Box<Fragile<RefCell<Box<dyn FnMut(&O) -> glib::Continue + 'static>>>> =
        Box::new(Fragile::new(RefCell::new(Box::new(func))));
    Box::into_raw(func) as glib_sys::gpointer
}