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
use_prelude!();
use ::ffi_sdk::{self, c_cb_params, COrderByParam, LiveQueryAvailability};
pub use event::LiveQueryEvent;
pub use single_document_event::SingleDocumentLiveQueryEvent;
use crate::{
ditto::{TryUpgrade, WeakDittoHandleWrapper},
error::{DittoError, ErrorKind},
subscription::Subscription,
};
mod event;
mod single_document_event;
pub use move_module::LiveQueryMove;
#[path = "move.rs"]
#[doc(hidden)]
mod move_module;
trait_alias! {
pub
trait SingleDocumentEventHandler =
FnMut(Option<BoxedDocument>, SingleDocumentLiveQueryEvent)
+ Send + 'static }
trait_alias! {
pub
trait EventHandler =
FnMut(Vec<BoxedDocument>, LiveQueryEvent)
+ Send + 'static }
pub struct LiveQuery {
ditto: WeakDittoHandleWrapper,
pub query: char_p::Box,
pub collection_name: char_p::Box,
pub subscription: Option<Box<Subscription>>,
pub id: i64,
}
const UNASSIGNED_ID_SENTINEL: i64 = -1;
impl LiveQuery {
#[rustfmt::skip]
#[allow(clippy::too_many_arguments)]
pub
fn with_handler<F> (
ditto: WeakDittoHandleWrapper,
query: char_p::Box,
query_args: Option<Vec<u8>>,
collection_name: char_p::Box,
order_by: &'_ [COrderByParam<'_>], limit: i32,
offset: u32,
event_handler: F,
) -> Result<Self, DittoError>
where
F : EventHandler,
{
let strong_ditto = ditto.try_upgrade()?;
let event_handler: Arc<F> = Arc::new(event_handler);
let ctx = Arc::into_raw(event_handler) as *mut c_void;
let retain_ctx = {
unsafe extern "C"
fn retain<F>(ctx: *mut c_void) {
Arc::<F>::increment_strong_count(ctx.cast());
}
retain::<F>
};
let release_ctx = {
unsafe extern "C"
fn release<F>(ctx: *mut c_void) {
drop(Arc::<F>::from_raw(ctx.cast()));
}
release::<F>
};
#[allow(improper_ctypes_definitions)] unsafe extern "C"
fn c_cb<F : EventHandler> (ctx: *mut c_void, p: c_cb_params)
{
let ctx: *mut F = ctx.cast();
let event_handler: &mut F = ctx.as_mut().expect("Got NULL");
let event = if p.is_initial { LiveQueryEvent::Initial
} else {
let moves: Vec<LiveQueryMove> =
p .moves
.as_ref()
.unwrap()
.as_slice()
.chunks_exact(2)
.map(|it| if let [left, right] = *it {
LiveQueryMove::new(left, right)
} else { unreachable!() })
.collect()
;
LiveQueryEvent::Update {
old_documents: p.old_documents.unwrap().into(),
insertions: p.insertions.unwrap().into(),
deletions: p.deletions.unwrap().into(),
updates: p.updates.unwrap().into(),
moves,
}
};
event_handler(p.documents.into(), event);
}
let mut this = LiveQuery {
ditto,
query,
collection_name,
subscription: None,
id: UNASSIGNED_ID_SENTINEL,
};
let id = &mut this.id;
let availability = LiveQueryAvailability::Always;
*id = unsafe {
ffi_sdk::ditto_live_query_register_str(
&*strong_ditto,
this.collection_name.as_ref(),
this.query.as_ref(),
query_args.as_ref().map(|qa| (&qa[..]).into()),
order_by.into(),
limit,
offset,
availability,
ctx,
Some(retain_ctx),
Some(release_ctx),
c_cb::<F>,
).ok_or(ErrorKind::InvalidInput)?
};
if *id == UNASSIGNED_ID_SENTINEL {
::log::error!("Live query was not given a valid id");
} else {
::log::debug!("Live query id: {}", id);
}
{
ffi_sdk::ditto_live_query_start(&*strong_ditto, *id);
}
Ok(this)
}
}
impl Drop for LiveQuery {
fn drop(self: &'_ mut LiveQuery) {
::log::debug!("Dropping LiveQuery {}", &self.id);
if let Some(ditto) = self.ditto.upgrade() {
ffi_sdk::ditto_live_query_stop(&*ditto, self.id);
}
}
}
impl crate::observer::Observer for LiveQuery {}