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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use ipc_channel::ipc::{self, IpcSender, OpaqueIpcSender};
use ipc_channel::router::ROUTER;
use opts;
use serde::{Deserialize, Deserializer, Serialize, Serializer};
use std::any::{Any, TypeId};
use std::collections::HashMap;
use std::io::{Error, ErrorKind};
use std::marker::Reflect;
use std::mem;
use std::sync::Mutex;
use std::sync::atomic::{ATOMIC_USIZE_INIT, AtomicUsize, Ordering};
use std::sync::mpsc::{self, Receiver, Sender};
lazy_static! {
static ref IN_PROCESS_SENDERS: Mutex<HashMap<usize, OpaqueSender>> =
Mutex::new(HashMap::new());
}
static NEXT_SENDER_ID: AtomicUsize = ATOMIC_USIZE_INIT;
pub enum OptionalIpcSender<T> where T: Deserialize + Serialize + Send + Any {
OutOfProcess(IpcSender<T>),
InProcess(Sender<T>),
}
impl<T> OptionalIpcSender<T> where T: Deserialize + Serialize + Send + Any {
pub fn send(&self, value: T) -> Result<(), Error> {
match *self {
OptionalIpcSender::OutOfProcess(ref ipc_sender) => ipc_sender.send(value),
OptionalIpcSender::InProcess(ref sender) => {
sender.send(value).map_err(|_| Error::new(ErrorKind::Other, "MPSC send failed"))
}
}
}
pub fn to_opaque(self) -> OptionalOpaqueIpcSender {
match self {
OptionalIpcSender::OutOfProcess(ipc_sender) => {
OptionalOpaqueIpcSender::OutOfProcess(ipc_sender.to_opaque())
}
OptionalIpcSender::InProcess(sender) => {
OptionalOpaqueIpcSender::InProcess(OpaqueSender::new(sender))
}
}
}
}
impl<T> Clone for OptionalIpcSender<T> where T: Deserialize + Serialize + Send + Any {
fn clone(&self) -> OptionalIpcSender<T> {
match *self {
OptionalIpcSender::OutOfProcess(ref ipc_sender) => {
OptionalIpcSender::OutOfProcess((*ipc_sender).clone())
}
OptionalIpcSender::InProcess(ref sender) => {
OptionalIpcSender::InProcess((*sender).clone())
}
}
}
}
impl<T> Deserialize for OptionalIpcSender<T> where T: Deserialize + Serialize + Send + Any {
fn deserialize<D>(deserializer: &mut D)
-> Result<OptionalIpcSender<T>, D::Error> where D: Deserializer {
if opts::multiprocess() {
return Ok(OptionalIpcSender::OutOfProcess(try!(Deserialize::deserialize(
deserializer))))
}
let id: usize = try!(Deserialize::deserialize(deserializer));
let sender = IN_PROCESS_SENDERS.lock().unwrap().remove(&id).unwrap();
Ok(OptionalIpcSender::InProcess(sender.to().unwrap()))
}
}
impl<T> Serialize for OptionalIpcSender<T> where T: Deserialize + Serialize + Send + Any {
fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error> where S: Serializer {
match *self {
OptionalIpcSender::OutOfProcess(ref ipc_sender) => ipc_sender.serialize(serializer),
OptionalIpcSender::InProcess(ref sender) => {
let id = NEXT_SENDER_ID.fetch_add(1, Ordering::SeqCst);
IN_PROCESS_SENDERS.lock()
.unwrap()
.insert(id, OpaqueSender::new((*sender).clone()));
id.serialize(serializer)
}
}
}
}
#[derive(Clone)]
pub enum OptionalOpaqueIpcSender {
OutOfProcess(OpaqueIpcSender),
InProcess(OpaqueSender),
}
impl OptionalOpaqueIpcSender {
pub fn to<T>(self) -> OptionalIpcSender<T>
where T: Deserialize + Serialize + Send + Any + 'static {
match self {
OptionalOpaqueIpcSender::OutOfProcess(ipc_sender) => {
OptionalIpcSender::OutOfProcess(ipc_sender.to())
}
OptionalOpaqueIpcSender::InProcess(sender) => {
OptionalIpcSender::InProcess(sender.to().unwrap())
}
}
}
}
impl Deserialize for OptionalOpaqueIpcSender {
fn deserialize<D>(deserializer: &mut D)
-> Result<OptionalOpaqueIpcSender, D::Error> where D: Deserializer {
if opts::multiprocess() {
return Ok(OptionalOpaqueIpcSender::OutOfProcess(try!(Deserialize::deserialize(
deserializer))))
}
let id: usize = try!(Deserialize::deserialize(deserializer));
let sender = IN_PROCESS_SENDERS.lock().unwrap().remove(&id).unwrap();
Ok(OptionalOpaqueIpcSender::InProcess(sender))
}
}
impl Serialize for OptionalOpaqueIpcSender {
fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error> where S: Serializer {
match *self {
OptionalOpaqueIpcSender::OutOfProcess(ref ipc_sender) => {
ipc_sender.serialize(serializer)
}
OptionalOpaqueIpcSender::InProcess(ref sender) => {
let id = NEXT_SENDER_ID.fetch_add(1, Ordering::SeqCst);
IN_PROCESS_SENDERS.lock().unwrap().insert(id, (*sender).clone());
id.serialize(serializer)
}
}
}
}
#[derive(Clone)]
pub struct OpaqueSender {
sender: Sender<()>,
id: TypeId,
}
impl OpaqueSender {
fn new<T>(sender: Sender<T>) -> OpaqueSender where T: 'static + Reflect + Send {
unsafe {
OpaqueSender {
sender: mem::transmute::<_, Sender<()>>(sender),
id: TypeId::of::<T>(),
}
}
}
fn to<T>(self) -> Option<Sender<T>> where T: 'static + Reflect + Send {
unsafe {
if self.id != TypeId::of::<T>() {
None
} else {
Some(mem::transmute::<_, Sender<T>>(self.sender))
}
}
}
}
pub fn optional_ipc_channel<T>() -> (OptionalIpcSender<T>, Receiver<T>)
where T: Deserialize + Serialize + Send + Any {
if opts::multiprocess() {
let (ipc_sender, ipc_receiver) = ipc::channel().unwrap();
let receiver = ROUTER.route_ipc_receiver_to_new_mpsc_receiver(ipc_receiver);
(OptionalIpcSender::OutOfProcess(ipc_sender), receiver)
} else {
let (sender, receiver) = mpsc::channel();
(OptionalIpcSender::InProcess(sender), receiver)
}
}
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