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
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
// This file was generated by gir (https://github.com/gtk-rs/gir)
// from gir-files (https://github.com/gtk-rs/gir-files)
// DO NOT EDIT

use crate::AsyncResult;
use crate::Cancellable;
use crate::InputStream;
use crate::OutputStream;
use glib::object::Cast;
use glib::object::IsA;
use glib::signal::connect_raw;
use glib::signal::SignalHandlerId;
use glib::translate::*;
use std::boxed::Box as Box_;
use std::fmt;
use std::mem::transmute;
use std::pin::Pin;
use std::ptr;

glib::wrapper! {
    /// GIOStream represents an object that has both read and write streams.
    /// Generally the two streams act as separate input and output streams,
    /// but they share some common resources and state. For instance, for
    /// seekable streams, both streams may use the same position.
    ///
    /// Examples of [`IOStream`][crate::IOStream] objects are [`SocketConnection`][crate::SocketConnection], which represents
    /// a two-way network connection; and [`FileIOStream`][crate::FileIOStream], which represents a
    /// file handle opened in read-write mode.
    ///
    /// To do the actual reading and writing you need to get the substreams
    /// with [`IOStreamExt::input_stream()`][crate::prelude::IOStreamExt::input_stream()] and [`IOStreamExt::output_stream()`][crate::prelude::IOStreamExt::output_stream()].
    ///
    /// The [`IOStream`][crate::IOStream] object owns the input and the output streams, not the other
    /// way around, so keeping the substreams alive will not keep the [`IOStream`][crate::IOStream]
    /// object alive. If the [`IOStream`][crate::IOStream] object is freed it will be closed, thus
    /// closing the substreams, so even if the substreams stay alive they will
    /// always return [`IOErrorEnum::Closed`][crate::IOErrorEnum::Closed] for all operations.
    ///
    /// To close a stream use [`IOStreamExt::close()`][crate::prelude::IOStreamExt::close()] which will close the common
    /// stream object and also the individual substreams. You can also close
    /// the substreams themselves. In most cases this only marks the
    /// substream as closed, so further I/O on it fails but common state in the
    /// [`IOStream`][crate::IOStream] may still be open. However, some streams may support
    /// "half-closed" states where one direction of the stream is actually shut down.
    ///
    /// Operations on `GIOStreams` cannot be started while another operation on the
    /// [`IOStream`][crate::IOStream] or its substreams is in progress. Specifically, an application can
    /// read from the [`InputStream`][crate::InputStream] and write to the [`OutputStream`][crate::OutputStream] simultaneously
    /// (either in separate threads, or as asynchronous operations in the same
    /// thread), but an application cannot start any [`IOStream`][crate::IOStream] operation while there
    /// is a [`IOStream`][crate::IOStream], [`InputStream`][crate::InputStream] or [`OutputStream`][crate::OutputStream] operation in progress, and
    /// an application can’t start any [`InputStream`][crate::InputStream] or [`OutputStream`][crate::OutputStream] operation
    /// while there is a [`IOStream`][crate::IOStream] operation in progress.
    ///
    /// This is a product of individual stream operations being associated with a
    /// given [`glib::MainContext`][crate::glib::MainContext] (the thread-default context at the time the operation was
    /// started), rather than entire streams being associated with a single
    /// [`glib::MainContext`][crate::glib::MainContext].
    ///
    /// GIO may run operations on `GIOStreams` from other (worker) threads, and this
    /// may be exposed to application code in the behaviour of wrapper streams, such
    /// as [`BufferedInputStream`][crate::BufferedInputStream] or [`TlsConnection`][crate::TlsConnection]. With such wrapper APIs,
    /// application code may only run operations on the base (wrapped) stream when
    /// the wrapper stream is idle. Note that the semantics of such operations may
    /// not be well-defined due to the state the wrapper stream leaves the base
    /// stream in (though they are guaranteed not to crash).
    ///
    /// This is an Abstract Base Class, you cannot instantiate it.
    ///
    /// # Implements
    ///
    /// [`IOStreamExt`][trait@crate::prelude::IOStreamExt], [`trait@glib::ObjectExt`], [`IOStreamExtManual`][trait@crate::prelude::IOStreamExtManual]
    #[doc(alias = "GIOStream")]
    pub struct IOStream(Object<ffi::GIOStream, ffi::GIOStreamClass>);

    match fn {
        type_ => || ffi::g_io_stream_get_type(),
    }
}

impl IOStream {
    pub const NONE: Option<&'static IOStream> = None;
}

/// Trait containing all [`struct@IOStream`] methods.
///
/// # Implementors
///
/// [`FileIOStream`][struct@crate::FileIOStream], [`IOStream`][struct@crate::IOStream], [`SimpleIOStream`][struct@crate::SimpleIOStream], [`SocketConnection`][struct@crate::SocketConnection], [`TlsConnection`][struct@crate::TlsConnection]
pub trait IOStreamExt: 'static {
    /// Clears the pending flag on `self`.
    #[doc(alias = "g_io_stream_clear_pending")]
    fn clear_pending(&self);

    /// Closes the stream, releasing resources related to it. This will also
    /// close the individual input and output streams, if they are not already
    /// closed.
    ///
    /// Once the stream is closed, all other operations will return
    /// [`IOErrorEnum::Closed`][crate::IOErrorEnum::Closed]. Closing a stream multiple times will not
    /// return an error.
    ///
    /// Closing a stream will automatically flush any outstanding buffers
    /// in the stream.
    ///
    /// Streams will be automatically closed when the last reference
    /// is dropped, but you might want to call this function to make sure
    /// resources are released as early as possible.
    ///
    /// Some streams might keep the backing store of the stream (e.g. a file
    /// descriptor) open after the stream is closed. See the documentation for
    /// the individual stream for details.
    ///
    /// On failure the first error that happened will be reported, but the
    /// close operation will finish as much as possible. A stream that failed
    /// to close will still return [`IOErrorEnum::Closed`][crate::IOErrorEnum::Closed] for all operations.
    /// Still, it is important to check and report the error to the user,
    /// otherwise there might be a loss of data as all data might not be written.
    ///
    /// If `cancellable` is not NULL, then the operation can be cancelled by
    /// triggering the cancellable object from another thread. If the operation
    /// was cancelled, the error [`IOErrorEnum::Cancelled`][crate::IOErrorEnum::Cancelled] will be returned.
    /// Cancelling a close will still leave the stream closed, but some streams
    /// can use a faster close that doesn't block to e.g. check errors.
    ///
    /// The default implementation of this method just calls close on the
    /// individual input/output streams.
    /// ## `cancellable`
    /// optional [`Cancellable`][crate::Cancellable] object, [`None`] to ignore
    ///
    /// # Returns
    ///
    /// [`true`] on success, [`false`] on failure
    #[doc(alias = "g_io_stream_close")]
    fn close(&self, cancellable: Option<&impl IsA<Cancellable>>) -> Result<(), glib::Error>;

    /// Requests an asynchronous close of the stream, releasing resources
    /// related to it. When the operation is finished `callback` will be
    /// called. You can then call `g_io_stream_close_finish()` to get
    /// the result of the operation.
    ///
    /// For behaviour details see [`close()`][Self::close()].
    ///
    /// The asynchronous methods have a default fallback that uses threads
    /// to implement asynchronicity, so they are optional for inheriting
    /// classes. However, if you override one you must override all.
    /// ## `io_priority`
    /// the io priority of the request
    /// ## `cancellable`
    /// optional cancellable object
    /// ## `callback`
    /// callback to call when the request is satisfied
    #[doc(alias = "g_io_stream_close_async")]
    fn close_async<P: FnOnce(Result<(), glib::Error>) + 'static>(
        &self,
        io_priority: glib::Priority,
        cancellable: Option<&impl IsA<Cancellable>>,
        callback: P,
    );

    fn close_future(
        &self,
        io_priority: glib::Priority,
    ) -> Pin<Box_<dyn std::future::Future<Output = Result<(), glib::Error>> + 'static>>;

    /// Gets the input stream for this object. This is used
    /// for reading.
    ///
    /// # Returns
    ///
    /// a [`InputStream`][crate::InputStream], owned by the [`IOStream`][crate::IOStream].
    /// Do not free.
    #[doc(alias = "g_io_stream_get_input_stream")]
    #[doc(alias = "get_input_stream")]
    fn input_stream(&self) -> InputStream;

    /// Gets the output stream for this object. This is used for
    /// writing.
    ///
    /// # Returns
    ///
    /// a [`OutputStream`][crate::OutputStream], owned by the [`IOStream`][crate::IOStream].
    /// Do not free.
    #[doc(alias = "g_io_stream_get_output_stream")]
    #[doc(alias = "get_output_stream")]
    fn output_stream(&self) -> OutputStream;

    /// Checks if a stream has pending actions.
    ///
    /// # Returns
    ///
    /// [`true`] if `self` has pending actions.
    #[doc(alias = "g_io_stream_has_pending")]
    fn has_pending(&self) -> bool;

    /// Checks if a stream is closed.
    ///
    /// # Returns
    ///
    /// [`true`] if the stream is closed.
    #[doc(alias = "g_io_stream_is_closed")]
    fn is_closed(&self) -> bool;

    /// Sets `self` to have actions pending. If the pending flag is
    /// already set or `self` is closed, it will return [`false`] and set
    /// `error`.
    ///
    /// # Returns
    ///
    /// [`true`] if pending was previously unset and is now set.
    #[doc(alias = "g_io_stream_set_pending")]
    fn set_pending(&self) -> Result<(), glib::Error>;

    #[doc(alias = "closed")]
    fn connect_closed_notify<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId;
}

impl<O: IsA<IOStream>> IOStreamExt for O {
    fn clear_pending(&self) {
        unsafe {
            ffi::g_io_stream_clear_pending(self.as_ref().to_glib_none().0);
        }
    }

    fn close(&self, cancellable: Option<&impl IsA<Cancellable>>) -> Result<(), glib::Error> {
        unsafe {
            let mut error = ptr::null_mut();
            let is_ok = ffi::g_io_stream_close(
                self.as_ref().to_glib_none().0,
                cancellable.map(|p| p.as_ref()).to_glib_none().0,
                &mut error,
            );
            assert_eq!(is_ok == glib::ffi::GFALSE, !error.is_null());
            if error.is_null() {
                Ok(())
            } else {
                Err(from_glib_full(error))
            }
        }
    }

    fn close_async<P: FnOnce(Result<(), glib::Error>) + 'static>(
        &self,
        io_priority: glib::Priority,
        cancellable: Option<&impl IsA<Cancellable>>,
        callback: P,
    ) {
        let main_context = glib::MainContext::ref_thread_default();
        let is_main_context_owner = main_context.is_owner();
        let has_acquired_main_context = (!is_main_context_owner)
            .then(|| main_context.acquire().ok())
            .flatten();
        assert!(
            is_main_context_owner || has_acquired_main_context.is_some(),
            "Async operations only allowed if the thread is owning the MainContext"
        );

        let user_data: Box_<glib::thread_guard::ThreadGuard<P>> =
            Box_::new(glib::thread_guard::ThreadGuard::new(callback));
        unsafe extern "C" fn close_async_trampoline<
            P: FnOnce(Result<(), glib::Error>) + 'static,
        >(
            _source_object: *mut glib::gobject_ffi::GObject,
            res: *mut crate::ffi::GAsyncResult,
            user_data: glib::ffi::gpointer,
        ) {
            let mut error = ptr::null_mut();
            let _ = ffi::g_io_stream_close_finish(_source_object as *mut _, res, &mut error);
            let result = if error.is_null() {
                Ok(())
            } else {
                Err(from_glib_full(error))
            };
            let callback: Box_<glib::thread_guard::ThreadGuard<P>> =
                Box_::from_raw(user_data as *mut _);
            let callback: P = callback.into_inner();
            callback(result);
        }
        let callback = close_async_trampoline::<P>;
        unsafe {
            ffi::g_io_stream_close_async(
                self.as_ref().to_glib_none().0,
                io_priority.into_glib(),
                cancellable.map(|p| p.as_ref()).to_glib_none().0,
                Some(callback),
                Box_::into_raw(user_data) as *mut _,
            );
        }
    }

    fn close_future(
        &self,
        io_priority: glib::Priority,
    ) -> Pin<Box_<dyn std::future::Future<Output = Result<(), glib::Error>> + 'static>> {
        Box_::pin(crate::GioFuture::new(
            self,
            move |obj, cancellable, send| {
                obj.close_async(io_priority, Some(cancellable), move |res| {
                    send.resolve(res);
                });
            },
        ))
    }

    fn input_stream(&self) -> InputStream {
        unsafe {
            from_glib_none(ffi::g_io_stream_get_input_stream(
                self.as_ref().to_glib_none().0,
            ))
        }
    }

    fn output_stream(&self) -> OutputStream {
        unsafe {
            from_glib_none(ffi::g_io_stream_get_output_stream(
                self.as_ref().to_glib_none().0,
            ))
        }
    }

    fn has_pending(&self) -> bool {
        unsafe { from_glib(ffi::g_io_stream_has_pending(self.as_ref().to_glib_none().0)) }
    }

    fn is_closed(&self) -> bool {
        unsafe { from_glib(ffi::g_io_stream_is_closed(self.as_ref().to_glib_none().0)) }
    }

    fn set_pending(&self) -> Result<(), glib::Error> {
        unsafe {
            let mut error = ptr::null_mut();
            let is_ok = ffi::g_io_stream_set_pending(self.as_ref().to_glib_none().0, &mut error);
            assert_eq!(is_ok == glib::ffi::GFALSE, !error.is_null());
            if error.is_null() {
                Ok(())
            } else {
                Err(from_glib_full(error))
            }
        }
    }

    fn connect_closed_notify<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn notify_closed_trampoline<P: IsA<IOStream>, F: Fn(&P) + 'static>(
            this: *mut ffi::GIOStream,
            _param_spec: glib::ffi::gpointer,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(IOStream::from_glib_borrow(this).unsafe_cast_ref())
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"notify::closed\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    notify_closed_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }
}

impl fmt::Display for IOStream {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.write_str("IOStream")
    }
}