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mod.rs
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mod.rs
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use crate::protocol;
use crate::util::url_encode;
use byteorder::{BigEndian, ByteOrder};
use bytes::Bytes;
use futures::sync::{mpsc, oneshot};
use futures::{Async, Future, Poll};
use protobuf;
use std::collections::HashMap;
use std::mem;
use crate::util::SeqGenerator;
mod types;
pub use self::types::*;
mod sender;
pub use self::sender::MercurySender;
component! {
MercuryManager : MercuryManagerInner {
sequence: SeqGenerator<u64> = SeqGenerator::new(0),
pending: HashMap<Vec<u8>, MercuryPending> = HashMap::new(),
subscriptions: Vec<(String, mpsc::UnboundedSender<MercuryResponse>)> = Vec::new(),
invalid: bool = false,
}
}
pub struct MercuryPending {
parts: Vec<Vec<u8>>,
partial: Option<Vec<u8>>,
callback: Option<oneshot::Sender<Result<MercuryResponse, MercuryError>>>,
}
pub struct MercuryFuture<T>(oneshot::Receiver<Result<T, MercuryError>>);
impl<T> Future for MercuryFuture<T> {
type Item = T;
type Error = MercuryError;
fn poll(&mut self) -> Poll<T, MercuryError> {
match self.0.poll() {
Ok(Async::Ready(Ok(value))) => Ok(Async::Ready(value)),
Ok(Async::Ready(Err(err))) => Err(err),
Ok(Async::NotReady) => Ok(Async::NotReady),
Err(oneshot::Canceled) => Err(MercuryError),
}
}
}
impl MercuryManager {
fn next_seq(&self) -> Vec<u8> {
let mut seq = vec![0u8; 8];
BigEndian::write_u64(&mut seq, self.lock(|inner| inner.sequence.get()));
seq
}
fn request(&self, req: MercuryRequest) -> MercuryFuture<MercuryResponse> {
let (tx, rx) = oneshot::channel();
let pending = MercuryPending {
parts: Vec::new(),
partial: None,
callback: Some(tx),
};
let seq = self.next_seq();
self.lock(|inner| {
if !inner.invalid {
inner.pending.insert(seq.clone(), pending);
}
});
let cmd = req.method.command();
let data = req.encode(&seq);
self.session().send_packet(cmd, data);
MercuryFuture(rx)
}
pub fn get<T: Into<String>>(&self, uri: T) -> MercuryFuture<MercuryResponse> {
self.request(MercuryRequest {
method: MercuryMethod::GET,
uri: uri.into(),
content_type: None,
payload: Vec::new(),
})
}
pub fn send<T: Into<String>>(&self, uri: T, data: Vec<u8>) -> MercuryFuture<MercuryResponse> {
self.request(MercuryRequest {
method: MercuryMethod::SEND,
uri: uri.into(),
content_type: None,
payload: vec![data],
})
}
pub fn sender<T: Into<String>>(&self, uri: T) -> MercurySender {
MercurySender::new(self.clone(), uri.into())
}
pub fn subscribe<T: Into<String>>(
&self,
uri: T,
) -> Box<dyn Future<Item = mpsc::UnboundedReceiver<MercuryResponse>, Error = MercuryError>>
{
let uri = uri.into();
let request = self.request(MercuryRequest {
method: MercuryMethod::SUB,
uri: uri.clone(),
content_type: None,
payload: Vec::new(),
});
let manager = self.clone();
Box::new(request.map(move |response| {
let (tx, rx) = mpsc::unbounded();
manager.lock(move |inner| {
if !inner.invalid {
debug!("subscribed uri={} count={}", uri, response.payload.len());
if response.payload.len() > 0 {
// Old subscription protocol, watch the provided list of URIs
for sub in response.payload {
let mut sub: protocol::pubsub::Subscription =
protobuf::parse_from_bytes(&sub).unwrap();
let sub_uri = sub.take_uri();
debug!("subscribed sub_uri={}", sub_uri);
inner.subscriptions.push((sub_uri, tx.clone()));
}
} else {
// New subscription protocol, watch the requested URI
inner.subscriptions.push((uri, tx));
}
}
});
rx
}))
}
pub(crate) fn dispatch(&self, cmd: u8, mut data: Bytes) {
let seq_len = BigEndian::read_u16(data.split_to(2).as_ref()) as usize;
let seq = data.split_to(seq_len).as_ref().to_owned();
let flags = data.split_to(1).as_ref()[0];
let count = BigEndian::read_u16(data.split_to(2).as_ref()) as usize;
let pending = self.lock(|inner| inner.pending.remove(&seq));
let mut pending = match pending {
Some(pending) => pending,
None if cmd == 0xb5 => MercuryPending {
parts: Vec::new(),
partial: None,
callback: None,
},
None => {
warn!("Ignore seq {:?} cmd {:x}", seq, cmd);
return;
}
};
for i in 0..count {
let mut part = Self::parse_part(&mut data);
if let Some(mut partial) = mem::replace(&mut pending.partial, None) {
partial.extend_from_slice(&part);
part = partial;
}
if i == count - 1 && (flags == 2) {
pending.partial = Some(part)
} else {
pending.parts.push(part);
}
}
if flags == 0x1 {
self.complete_request(cmd, pending);
} else {
self.lock(move |inner| inner.pending.insert(seq, pending));
}
}
fn parse_part(data: &mut Bytes) -> Vec<u8> {
let size = BigEndian::read_u16(data.split_to(2).as_ref()) as usize;
data.split_to(size).as_ref().to_owned()
}
fn complete_request(&self, cmd: u8, mut pending: MercuryPending) {
let header_data = pending.parts.remove(0);
let header: protocol::mercury::Header = protobuf::parse_from_bytes(&header_data).unwrap();
let response = MercuryResponse {
uri: url_encode(header.get_uri()).to_owned(),
status_code: header.get_status_code(),
payload: pending.parts,
};
if response.status_code >= 500 {
panic!("Spotify servers returned an error. Restart librespot.");
} else if response.status_code >= 400 {
warn!("error {} for uri {}", response.status_code, &response.uri);
if let Some(cb) = pending.callback {
let _ = cb.send(Err(MercuryError));
}
} else {
if cmd == 0xb5 {
self.lock(|inner| {
let mut found = false;
inner.subscriptions.retain(|&(ref prefix, ref sub)| {
if response.uri.starts_with(prefix) {
found = true;
// if send fails, remove from list of subs
// TODO: send unsub message
sub.unbounded_send(response.clone()).is_ok()
} else {
// URI doesn't match
true
}
});
if !found {
debug!("unknown subscription uri={}", response.uri);
}
})
} else if let Some(cb) = pending.callback {
let _ = cb.send(Ok(response));
}
}
}
pub(crate) fn shutdown(&self) {
self.lock(|inner| {
inner.invalid = true;
// destroy the sending halves of the channels to signal everyone who is waiting for something.
inner.pending.clear();
inner.subscriptions.clear();
});
}
}