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
// Copyright The pipewire-rs Contributors.
// SPDX-License-Identifier: MIT

use bitflags::bitflags;
use libc::c_void;
use std::ops::Deref;
use std::pin::Pin;
use std::{
    ffi::{CStr, CString},
    ptr,
};
use std::{fmt, mem};

use crate::{
    permissions::Permission,
    proxy::{Listener, Proxy, ProxyT},
    types::ObjectType,
};
use spa::spa_interface_call_method;

#[derive(Debug)]
pub struct Client {
    proxy: Proxy,
}

impl ProxyT for Client {
    fn type_() -> ObjectType {
        ObjectType::Client
    }

    fn upcast(self) -> Proxy {
        self.proxy
    }

    fn upcast_ref(&self) -> &Proxy {
        &self.proxy
    }

    unsafe fn from_proxy_unchecked(proxy: Proxy) -> Self
    where
        Self: Sized,
    {
        Self { proxy }
    }
}

impl Client {
    // TODO: add non-local version when we'll bind pw_thread_loop_start()
    #[must_use]
    pub fn add_listener_local(&self) -> ClientListenerLocalBuilder {
        ClientListenerLocalBuilder {
            client: self,
            cbs: ListenerLocalCallbacks::default(),
        }
    }

    pub fn error(&self, id: u32, res: i32, message: &str) {
        let message = CString::new(message).expect("Null byte in message parameter");
        let message_cstr = message.as_c_str();
        Client::error_cstr(self, id, res, message_cstr)
    }

    pub fn error_cstr(&self, id: u32, res: i32, message: &CStr) {
        unsafe {
            spa_interface_call_method!(
                self.proxy.as_ptr(),
                pw_sys::pw_client_methods,
                error,
                id,
                res,
                message.as_ptr() as *const _
            );
        };
    }

    pub fn update_properties(&self, properties: &spa::utils::dict::DictRef) {
        unsafe {
            spa_interface_call_method!(
                self.proxy.as_ptr(),
                pw_sys::pw_client_methods,
                update_properties,
                properties.as_raw_ptr()
            );
        }
    }

    pub fn get_permissions(&self, index: u32, num: u32) {
        unsafe {
            spa_interface_call_method!(
                self.proxy.as_ptr(),
                pw_sys::pw_client_methods,
                get_permissions,
                index,
                num
            );
        }
    }

    pub fn update_permissions(&self, permissions: &[Permission]) {
        unsafe {
            spa_interface_call_method!(
                self.proxy.as_ptr(),
                pw_sys::pw_client_methods,
                update_permissions,
                permissions.len() as u32,
                permissions.as_ptr().cast()
            );
        }
    }
}

#[derive(Default)]
struct ListenerLocalCallbacks {
    #[allow(clippy::type_complexity)]
    info: Option<Box<dyn Fn(&ClientInfoRef)>>,
    #[allow(clippy::type_complexity)]
    permissions: Option<Box<dyn Fn(u32, &[Permission])>>,
}

pub struct ClientListenerLocalBuilder<'a> {
    client: &'a Client,
    cbs: ListenerLocalCallbacks,
}

#[repr(transparent)]
pub struct ClientInfoRef(pw_sys::pw_client_info);

impl ClientInfoRef {
    pub fn as_raw(&self) -> &pw_sys::pw_client_info {
        &self.0
    }

    pub fn as_raw_ptr(&self) -> *mut pw_sys::pw_client_info {
        std::ptr::addr_of!(self.0).cast_mut()
    }

    pub fn id(&self) -> u32 {
        self.0.id
    }

    pub fn change_mask(&self) -> ClientChangeMask {
        ClientChangeMask::from_bits(self.0.change_mask).expect("invalid change_mask")
    }

    pub fn props(&self) -> Option<&spa::utils::dict::DictRef> {
        let props_ptr: *mut spa::utils::dict::DictRef = self.0.props.cast();
        ptr::NonNull::new(props_ptr).map(|ptr| unsafe { ptr.as_ref() })
    }
}

impl fmt::Debug for ClientInfoRef {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.debug_struct("ClientInfoRef")
            .field("id", &self.id())
            .field("change-mask", &self.change_mask())
            .field("props", &self.props())
            .finish()
    }
}

pub struct ClientInfo {
    ptr: ptr::NonNull<pw_sys::pw_client_info>,
}

impl ClientInfo {
    pub fn new(ptr: ptr::NonNull<pw_sys::pw_client_info>) -> Self {
        Self { ptr }
    }

    pub fn from_raw(raw: *mut pw_sys::pw_client_info) -> Self {
        Self {
            ptr: ptr::NonNull::new(raw).expect("Provided pointer is null"),
        }
    }

    pub fn into_raw(self) -> *mut pw_sys::pw_client_info {
        std::mem::ManuallyDrop::new(self).ptr.as_ptr()
    }
}

impl Drop for ClientInfo {
    fn drop(&mut self) {
        unsafe { pw_sys::pw_client_info_free(self.ptr.as_ptr()) }
    }
}

impl std::ops::Deref for ClientInfo {
    type Target = ClientInfoRef;

    fn deref(&self) -> &Self::Target {
        unsafe { self.ptr.cast::<ClientInfoRef>().as_ref() }
    }
}

impl AsRef<ClientInfoRef> for ClientInfo {
    fn as_ref(&self) -> &ClientInfoRef {
        self.deref()
    }
}

bitflags! {
    #[derive(Debug, PartialEq, Eq, Clone, Copy)]
    pub struct ClientChangeMask: u64 {
        const PROPS = pw_sys::PW_CLIENT_CHANGE_MASK_PROPS as u64;
    }
}

impl fmt::Debug for ClientInfo {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.debug_struct("ClientInfo")
            .field("id", &self.id())
            .field("change-mask", &self.change_mask())
            .field("props", &self.props())
            .finish()
    }
}

pub struct ClientListener {
    // Need to stay allocated while the listener is registered
    #[allow(dead_code)]
    events: Pin<Box<pw_sys::pw_client_events>>,
    listener: Pin<Box<spa_sys::spa_hook>>,
    #[allow(dead_code)]
    data: Box<ListenerLocalCallbacks>,
}

impl Listener for ClientListener {}

impl Drop for ClientListener {
    fn drop(&mut self) {
        spa::utils::hook::remove(*self.listener);
    }
}

impl<'a> ClientListenerLocalBuilder<'a> {
    #[must_use]
    pub fn info<F>(mut self, info: F) -> Self
    where
        F: Fn(&ClientInfoRef) + 'static,
    {
        self.cbs.info = Some(Box::new(info));
        self
    }

    pub fn permissions<F>(mut self, permissions: F) -> Self
    where
        F: Fn(u32, &[Permission]) + 'static,
    {
        self.cbs.permissions = Some(Box::new(permissions));
        self
    }

    #[must_use]
    pub fn register(self) -> ClientListener {
        unsafe extern "C" fn client_events_info(
            data: *mut c_void,
            info: *const pw_sys::pw_client_info,
        ) {
            let callbacks = (data as *mut ListenerLocalCallbacks).as_ref().unwrap();
            let info =
                ptr::NonNull::new(info as *mut pw_sys::pw_client_info).expect("info is NULL");
            let info = info.cast::<ClientInfoRef>().as_ref();
            callbacks.info.as_ref().unwrap()(info);
        }

        unsafe extern "C" fn client_events_permissions(
            data: *mut c_void,
            index: u32,
            n_permissions: u32,
            permissions: *const pw_sys::pw_permission,
        ) {
            let callbacks = (data as *mut ListenerLocalCallbacks).as_ref().unwrap();
            let permissions =
                std::slice::from_raw_parts(permissions.cast(), n_permissions as usize);

            callbacks.permissions.as_ref().unwrap()(index, permissions);
        }

        let e = unsafe {
            let mut e: Pin<Box<pw_sys::pw_client_events>> = Box::pin(mem::zeroed());
            e.version = pw_sys::PW_VERSION_CLIENT_EVENTS;

            if self.cbs.info.is_some() {
                e.info = Some(client_events_info);
            }
            if self.cbs.permissions.is_some() {
                e.permissions = Some(client_events_permissions);
            }

            e
        };

        let (listener, data) = unsafe {
            let client = &self.client.proxy.as_ptr();

            let data = Box::into_raw(Box::new(self.cbs));
            let mut listener: Pin<Box<spa_sys::spa_hook>> = Box::pin(mem::zeroed());
            let listener_ptr: *mut spa_sys::spa_hook = listener.as_mut().get_unchecked_mut();

            spa_interface_call_method!(
                client,
                pw_sys::pw_client_methods,
                add_listener,
                listener_ptr.cast(),
                e.as_ref().get_ref(),
                data as *mut _
            );

            (listener, Box::from_raw(data))
        };

        ClientListener {
            events: e,
            listener,
            data,
        }
    }
}