Files
adler32
aho_corasick
alga
approx
ascii
atty
backtrace
backtrace_sys
base64
bitflags
blas_src
block_buffer
block_padding
brotli2
brotli_sys
buf_redux
byte_tools
byteorder
cauchy
cblas_sys
cfg_if
chrono
chunked_transfer
colored
crc32fast
crossbeam
crossbeam_channel
crossbeam_deque
crossbeam_epoch
crossbeam_queue
crossbeam_utils
ctrlc
deflate
digest
dirs
error_chain
filetime
futures
generic_array
getrandom
gzip_header
hex
httparse
hyper
idna
itoa
language_tags
lapack_src
lapacke
lapacke_sys
lazy_static
libc
libm
linked_hash_map
log
matches
matrixmultiply
maybe_uninit
md5
memchr
memoffset
mime
mime_guess
multipart
nalgebra
base
geometry
linalg
ndarray
ndarray_linalg
net2
netlib_src
nix
num_complex
num_cpus
num_integer
num_rational
num_traits
opaque_debug
percent_encoding
phf
phf_shared
ppv_lite86
proc_macro2
quick_error
quote
rand
rand_chacha
rand_core
rand_distr
rawpointer
regex
regex_syntax
remove_dir_all
rosrust
rosrust_codegen
rosrust_msg
rouille
rustc_demangle
rustros_tf
ryu
safemem
scopeguard
serde
serde_bytes
serde_derive
serde_json
serde_xml_rs
sha1
siphasher
smallvec
syn
tempdir
term
thread_local
threadpool
time
tiny_http
traitobject
twoway
typeable
typenum
ucd_util
unicase
unicode_bidi
unicode_normalization
unicode_xid
url
utf8_ranges
void
xml
xml_rpc
yaml_rust
 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
use crate::util::killable_channel::{channel, KillMode, Killer, Receiver, SendMode, Sender};
use crate::util::FAILED_TO_LOCK;
use crossbeam::channel;
use std::sync::atomic::{AtomicBool, Ordering};
use std::sync::{Arc, Mutex};

#[allow(clippy::mutex_atomic)]
pub fn lossy_channel<T>(queue_size: usize) -> (LossySender<T>, LossyReceiver<T>) {
    let (killer, data_tx, receiver) = channel(SendMode::Unbounded, KillMode::Async);
    let is_open = Arc::new(AtomicBool::new(true));
    let queue_size = Arc::new(Mutex::new(queue_size));
    let sender = LossySender {
        data_tx,
        data_rx: receiver.data_rx.clone(),
        killer,
        is_open,
        queue_size,
    };
    (sender, receiver)
}

#[derive(Clone)]
pub struct LossySender<T> {
    data_tx: Sender<T>,
    data_rx: channel::Receiver<T>,
    killer: Killer,
    is_open: Arc<AtomicBool>,
    pub queue_size: Arc<Mutex<usize>>,
}

impl<T> LossySender<T> {
    pub fn try_send(&self, msg: T) -> Result<(), channel::TrySendError<T>> {
        if !self.is_open.load(Ordering::SeqCst) {
            return Err(channel::TrySendError::Disconnected(msg));
        }
        self.data_tx.try_send(msg)?;
        self.remove_extra_data();
        Ok(())
    }

    pub fn close(&mut self) -> Result<(), channel::SendError<()>> {
        self.is_open.store(false, Ordering::SeqCst);
        self.killer.send()
    }

    fn remove_extra_data(&self) {
        let queue_size: usize = *self.queue_size.lock().expect(FAILED_TO_LOCK);
        while self.data_rx.len() > queue_size {
            if self.data_rx.try_recv().is_err() {
                log::error!("Failed to remove excess data from message queue");
                break;
            }
        }
    }

    pub fn set_queue_size(&self, queue_size: usize) {
        *self.queue_size.lock().expect(FAILED_TO_LOCK) = queue_size;
    }

    pub fn set_queue_size_max(&self, queue_size: usize) {
        let mut current_size = self.queue_size.lock().expect(FAILED_TO_LOCK);
        *current_size = current_size.max(queue_size);
    }
}

pub type LossyReceiver<T> = Receiver<T>;