zbus_xml/
lib.rs

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
370
371
372
373
374
#![deny(rust_2018_idioms)]
#![doc(
    html_logo_url = "https://raw.githubusercontent.com/dbus2/zbus/9f7a90d2b594ddc48b7a5f39fda5e00cd56a7dfb/logo.png"
)]
#![doc = include_str!("../README.md")]
#![doc(test(attr(
    warn(unused),
    deny(warnings),
    allow(dead_code),
    // W/o this, we seem to get some bogus warning about `extern crate zbus`.
    allow(unused_extern_crates),
)))]

mod error;
pub use error::{Error, Result};

use quick_xml::{de::Deserializer, se::to_writer};
use serde::{Deserialize, Serialize};
use static_assertions::assert_impl_all;
use std::{
    io::{BufReader, Read, Write},
    ops::Deref,
};

use zbus_names::{InterfaceName, MemberName, PropertyName};

/// Annotations are generic key/value pairs of metadata.
#[derive(Debug, Serialize, Deserialize, Clone, PartialEq)]
pub struct Annotation {
    #[serde(rename = "@name")]
    name: String,
    #[serde(rename = "@value")]
    value: String,
}

assert_impl_all!(Annotation: Send, Sync, Unpin);

impl Annotation {
    /// Return the annotation name/key.
    pub fn name(&self) -> &str {
        &self.name
    }

    /// Return the annotation value.
    pub fn value(&self) -> &str {
        &self.value
    }
}

/// A direction of an argument
#[derive(Clone, Copy, Debug, Eq, PartialEq, Serialize, Deserialize)]
pub enum ArgDirection {
    #[serde(rename = "in")]
    In,
    #[serde(rename = "out")]
    Out,
}

/// An argument
#[derive(Debug, Deserialize, Serialize, Clone, PartialEq)]
pub struct Arg {
    #[serde(rename = "@name")]
    name: Option<String>,
    #[serde(rename = "@type")]
    ty: Signature,
    #[serde(rename = "@direction")]
    direction: Option<ArgDirection>,
    #[serde(rename = "annotation", default)]
    annotations: Vec<Annotation>,
}

assert_impl_all!(Arg: Send, Sync, Unpin);

impl Arg {
    /// Return the argument name, if any.
    pub fn name(&self) -> Option<&str> {
        self.name.as_deref()
    }

    /// Return the argument type.
    pub fn ty(&self) -> &Signature {
        &self.ty
    }

    /// Return the argument direction, if any.
    pub fn direction(&self) -> Option<ArgDirection> {
        self.direction
    }

    /// Return the associated annotations.
    pub fn annotations(&self) -> &[Annotation] {
        &self.annotations
    }
}

/// A method
#[derive(Debug, Deserialize, Serialize, Clone, PartialEq)]
pub struct Method<'a> {
    #[serde(rename = "@name", borrow)]
    name: MemberName<'a>,
    #[serde(rename = "arg", default)]
    args: Vec<Arg>,
    #[serde(rename = "annotation", default)]
    annotations: Vec<Annotation>,
}

assert_impl_all!(Method<'_>: Send, Sync, Unpin);

impl<'a> Method<'a> {
    /// Return the method name.
    pub fn name(&self) -> MemberName<'_> {
        self.name.as_ref()
    }

    /// Return the method arguments.
    pub fn args(&self) -> &[Arg] {
        &self.args
    }

    /// Return the method annotations.
    pub fn annotations(&self) -> &[Annotation] {
        &self.annotations
    }
}

/// A signal
#[derive(Debug, Deserialize, Serialize, Clone, PartialEq)]
pub struct Signal<'a> {
    #[serde(rename = "@name", borrow)]
    name: MemberName<'a>,

    #[serde(rename = "arg", default)]
    args: Vec<Arg>,
    #[serde(rename = "annotation", default)]
    annotations: Vec<Annotation>,
}

assert_impl_all!(Signal<'_>: Send, Sync, Unpin);

impl<'a> Signal<'a> {
    /// Return the signal name.
    pub fn name(&self) -> MemberName<'_> {
        self.name.as_ref()
    }

    /// Return the signal arguments.
    pub fn args(&self) -> &[Arg] {
        &self.args
    }

    /// Return the signal annotations.
    pub fn annotations(&self) -> &[Annotation] {
        &self.annotations
    }
}

/// The possible property access types
#[derive(Clone, Copy, Debug, PartialEq, Eq, Serialize, Deserialize)]
pub enum PropertyAccess {
    #[serde(rename = "read")]
    Read,
    #[serde(rename = "write")]
    Write,
    #[serde(rename = "readwrite")]
    ReadWrite,
}

impl PropertyAccess {
    pub fn read(&self) -> bool {
        matches!(self, PropertyAccess::Read | PropertyAccess::ReadWrite)
    }

    pub fn write(&self) -> bool {
        matches!(self, PropertyAccess::Write | PropertyAccess::ReadWrite)
    }
}

/// A property
#[derive(Debug, Deserialize, Serialize, Clone, PartialEq)]
pub struct Property<'a> {
    #[serde(rename = "@name", borrow)]
    name: PropertyName<'a>,

    #[serde(rename = "@type")]
    ty: Signature,
    #[serde(rename = "@access")]
    access: PropertyAccess,

    #[serde(rename = "annotation", default)]
    annotations: Vec<Annotation>,
}

assert_impl_all!(Property<'_>: Send, Sync, Unpin);

impl<'a> Property<'a> {
    /// Returns the property name.
    pub fn name(&self) -> PropertyName<'_> {
        self.name.as_ref()
    }

    /// Returns the property type.
    pub fn ty(&self) -> &Signature {
        &self.ty
    }

    /// Returns the property access flags (should be "read", "write" or "readwrite").
    pub fn access(&self) -> PropertyAccess {
        self.access
    }

    /// Return the associated annotations.
    pub fn annotations(&self) -> &[Annotation] {
        &self.annotations
    }
}

/// An interface
#[derive(Debug, Deserialize, Serialize, Clone, PartialEq)]
pub struct Interface<'a> {
    #[serde(rename = "@name", borrow)]
    name: InterfaceName<'a>,

    #[serde(rename = "method", default)]
    methods: Vec<Method<'a>>,
    #[serde(rename = "property", default)]
    properties: Vec<Property<'a>>,
    #[serde(rename = "signal", default)]
    signals: Vec<Signal<'a>>,
    #[serde(rename = "annotation", default)]
    annotations: Vec<Annotation>,
}

assert_impl_all!(Interface<'_>: Send, Sync, Unpin);

impl<'a> Interface<'a> {
    /// Returns the interface name.
    pub fn name(&self) -> InterfaceName<'_> {
        self.name.as_ref()
    }

    /// Returns the interface methods.
    pub fn methods(&self) -> &[Method<'a>] {
        &self.methods
    }

    /// Returns the interface signals.
    pub fn signals(&self) -> &[Signal<'a>] {
        &self.signals
    }

    /// Returns the interface properties.
    pub fn properties(&self) -> &[Property<'_>] {
        &self.properties
    }

    /// Return the associated annotations.
    pub fn annotations(&self) -> &[Annotation] {
        &self.annotations
    }
}

/// An introspection tree node (typically the root of the XML document).
#[derive(Debug, Deserialize, Serialize, Clone, PartialEq)]
pub struct Node<'a> {
    #[serde(rename = "@name")]
    name: Option<String>,

    #[serde(rename = "interface", default, borrow)]
    interfaces: Vec<Interface<'a>>,
    #[serde(rename = "node", default, borrow)]
    nodes: Vec<Node<'a>>,
}

assert_impl_all!(Node<'_>: Send, Sync, Unpin);

impl<'a> Node<'a> {
    /// Parse the introspection XML document from reader.
    pub fn from_reader<R: Read>(reader: R) -> Result<Node<'a>> {
        let mut deserializer = Deserializer::from_reader(BufReader::new(reader));
        deserializer.event_buffer_size(Some(1024_usize.try_into().unwrap()));
        Ok(Node::deserialize(&mut deserializer)?)
    }

    /// Write the XML document to writer.
    pub fn to_writer<W: Write>(&self, writer: W) -> Result<()> {
        // Need this wrapper until this is resolved: https://github.com/tafia/quick-xml/issues/499
        struct Writer<T>(T);

        impl<T> std::fmt::Write for Writer<T>
        where
            T: Write,
        {
            fn write_str(&mut self, s: &str) -> std::fmt::Result {
                self.0.write_all(s.as_bytes()).map_err(|_| std::fmt::Error)
            }
        }

        to_writer(Writer(writer), &self)?;

        Ok(())
    }

    /// Returns the node name, if any.
    pub fn name(&self) -> Option<&str> {
        self.name.as_deref()
    }

    /// Returns the children nodes.
    pub fn nodes(&self) -> &[Node<'a>] {
        &self.nodes
    }

    /// Returns the interfaces on this node.
    pub fn interfaces(&self) -> &[Interface<'a>] {
        &self.interfaces
    }
}

impl<'a> TryFrom<&'a str> for Node<'a> {
    type Error = Error;

    /// Parse the introspection XML document from `s`.
    fn try_from(s: &'a str) -> Result<Node<'a>> {
        let mut deserializer = Deserializer::from_str(s);
        deserializer.event_buffer_size(Some(1024_usize.try_into().unwrap()));
        Ok(Node::deserialize(&mut deserializer)?)
    }
}

/// A thin wrapper around `zvariant::parsed::Signature`.
///
/// This is to allow `Signature` to be deserialized from an owned string, which is what quick-xml2
/// deserializer does.
#[derive(Debug, Serialize, Clone, PartialEq)]
pub struct Signature(zvariant::Signature);

impl Signature {
    /// Return the inner `zvariant::Signature`.
    pub fn inner(&self) -> &zvariant::Signature {
        &self.0
    }

    /// Convert this `Signature` into the inner `zvariant::parsed::Signature`.
    pub fn into_inner(self) -> zvariant::Signature {
        self.0
    }
}

impl<'de> serde::de::Deserialize<'de> for Signature {
    fn deserialize<D>(deserializer: D) -> std::result::Result<Self, D::Error>
    where
        D: serde::de::Deserializer<'de>,
    {
        String::deserialize(deserializer).and_then(|s| {
            zvariant::Signature::try_from(s.as_bytes())
                .map_err(serde::de::Error::custom)
                .map(Signature)
        })
    }
}

impl Deref for Signature {
    type Target = zvariant::Signature;

    fn deref(&self) -> &Self::Target {
        self.inner()
    }
}

impl PartialEq<str> for Signature {
    fn eq(&self, other: &str) -> bool {
        self.0 == other
    }
}