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
// 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::FileInfo;
use crate::IOStream;
use crate::Seekable;
use glib::object::IsA;
use glib::translate::*;
use std::boxed::Box as Box_;
use std::fmt;
use std::pin::Pin;
use std::ptr;

glib::wrapper! {
    /// GFileIOStream provides io streams that both read and write to the same
    /// file handle.
    ///
    /// GFileIOStream implements [`Seekable`][crate::Seekable], which allows the io
    /// stream to jump to arbitrary positions in the file and to truncate
    /// the file, provided the filesystem of the file supports these
    /// operations.
    ///
    /// To find the position of a file io stream, use
    /// [`SeekableExt::tell()`][crate::prelude::SeekableExt::tell()].
    ///
    /// To find out if a file io stream supports seeking, use [`SeekableExt::can_seek()`][crate::prelude::SeekableExt::can_seek()].
    /// To position a file io stream, use [`SeekableExt::seek()`][crate::prelude::SeekableExt::seek()].
    /// To find out if a file io stream supports truncating, use
    /// [`SeekableExt::can_truncate()`][crate::prelude::SeekableExt::can_truncate()]. To truncate a file io
    /// stream, use [`SeekableExt::truncate()`][crate::prelude::SeekableExt::truncate()].
    ///
    /// The default implementation of all the [`FileIOStream`][crate::FileIOStream] operations
    /// and the implementation of [`Seekable`][crate::Seekable] just call into the same operations
    /// on the output stream.
    ///
    /// # Implements
    ///
    /// [`FileIOStreamExt`][trait@crate::prelude::FileIOStreamExt], [`IOStreamExt`][trait@crate::prelude::IOStreamExt], [`trait@glib::ObjectExt`], [`SeekableExt`][trait@crate::prelude::SeekableExt], [`IOStreamExtManual`][trait@crate::prelude::IOStreamExtManual]
    #[doc(alias = "GFileIOStream")]
    pub struct FileIOStream(Object<ffi::GFileIOStream, ffi::GFileIOStreamClass>) @extends IOStream, @implements Seekable;

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

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

/// Trait containing all [`struct@FileIOStream`] methods.
///
/// # Implementors
///
/// [`FileIOStream`][struct@crate::FileIOStream]
pub trait FileIOStreamExt: 'static {
    /// Gets the entity tag for the file when it has been written.
    /// This must be called after the stream has been written
    /// and closed, as the etag can change while writing.
    ///
    /// # Returns
    ///
    /// the entity tag for the stream.
    #[doc(alias = "g_file_io_stream_get_etag")]
    #[doc(alias = "get_etag")]
    fn etag(&self) -> Option<glib::GString>;

    /// Queries a file io stream for the given `attributes`.
    /// This function blocks while querying the stream. For the asynchronous
    /// version of this function, see [`query_info_async()`][Self::query_info_async()].
    /// While the stream is blocked, the stream will set the pending flag
    /// internally, and any other operations on the stream will fail with
    /// [`IOErrorEnum::Pending`][crate::IOErrorEnum::Pending].
    ///
    /// Can fail if the stream was already closed (with `error` being set to
    /// [`IOErrorEnum::Closed`][crate::IOErrorEnum::Closed]), the stream has pending operations (with `error` being
    /// set to [`IOErrorEnum::Pending`][crate::IOErrorEnum::Pending]), or if querying info is not supported for
    /// the stream's interface (with `error` being set to [`IOErrorEnum::NotSupported`][crate::IOErrorEnum::NotSupported]). I
    /// all cases of failure, [`None`] will be returned.
    ///
    /// If `cancellable` is not [`None`], 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 set, and [`None`] will
    /// be returned.
    /// ## `attributes`
    /// a file attribute query string.
    /// ## `cancellable`
    /// optional [`Cancellable`][crate::Cancellable] object, [`None`] to ignore.
    ///
    /// # Returns
    ///
    /// a [`FileInfo`][crate::FileInfo] for the `self`, or [`None`] on error.
    #[doc(alias = "g_file_io_stream_query_info")]
    fn query_info(
        &self,
        attributes: &str,
        cancellable: Option<&impl IsA<Cancellable>>,
    ) -> Result<FileInfo, glib::Error>;

    /// Asynchronously queries the `self` for a [`FileInfo`][crate::FileInfo]. When completed,
    /// `callback` will be called with a [`AsyncResult`][crate::AsyncResult] which can be used to
    /// finish the operation with `g_file_io_stream_query_info_finish()`.
    ///
    /// For the synchronous version of this function, see
    /// [`query_info()`][Self::query_info()].
    /// ## `attributes`
    /// a file attribute query string.
    /// ## `io_priority`
    /// the [I/O priority][gio-GIOScheduler] of the request
    /// ## `cancellable`
    /// optional [`Cancellable`][crate::Cancellable] object, [`None`] to ignore.
    /// ## `callback`
    /// callback to call when the request is satisfied
    #[doc(alias = "g_file_io_stream_query_info_async")]
    fn query_info_async<P: FnOnce(Result<FileInfo, glib::Error>) + 'static>(
        &self,
        attributes: &str,
        io_priority: glib::Priority,
        cancellable: Option<&impl IsA<Cancellable>>,
        callback: P,
    );

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

impl<O: IsA<FileIOStream>> FileIOStreamExt for O {
    fn etag(&self) -> Option<glib::GString> {
        unsafe {
            from_glib_full(ffi::g_file_io_stream_get_etag(
                self.as_ref().to_glib_none().0,
            ))
        }
    }

    fn query_info(
        &self,
        attributes: &str,
        cancellable: Option<&impl IsA<Cancellable>>,
    ) -> Result<FileInfo, glib::Error> {
        unsafe {
            let mut error = ptr::null_mut();
            let ret = ffi::g_file_io_stream_query_info(
                self.as_ref().to_glib_none().0,
                attributes.to_glib_none().0,
                cancellable.map(|p| p.as_ref()).to_glib_none().0,
                &mut error,
            );
            if error.is_null() {
                Ok(from_glib_full(ret))
            } else {
                Err(from_glib_full(error))
            }
        }
    }

    fn query_info_async<P: FnOnce(Result<FileInfo, glib::Error>) + 'static>(
        &self,
        attributes: &str,
        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 query_info_async_trampoline<
            P: FnOnce(Result<FileInfo, 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 ret =
                ffi::g_file_io_stream_query_info_finish(_source_object as *mut _, res, &mut error);
            let result = if error.is_null() {
                Ok(from_glib_full(ret))
            } 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 = query_info_async_trampoline::<P>;
        unsafe {
            ffi::g_file_io_stream_query_info_async(
                self.as_ref().to_glib_none().0,
                attributes.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 query_info_future(
        &self,
        attributes: &str,
        io_priority: glib::Priority,
    ) -> Pin<Box_<dyn std::future::Future<Output = Result<FileInfo, glib::Error>> + 'static>> {
        let attributes = String::from(attributes);
        Box_::pin(crate::GioFuture::new(
            self,
            move |obj, cancellable, send| {
                obj.query_info_async(&attributes, io_priority, Some(cancellable), move |res| {
                    send.resolve(res);
                });
            },
        ))
    }
}

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