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use bytes::{BufMut, BytesMut};
use crate::rpc_proto;
use futures::future;
use libp2p_core::{InboundUpgrade, OutboundUpgrade, UpgradeInfo, PeerId};
use protobuf::Message as ProtobufMessage;
use std::{io, iter};
use tokio_codec::{Decoder, Encoder, Framed};
use tokio_io::{AsyncRead, AsyncWrite};
use topic::TopicHash;
use unsigned_varint::codec;
#[derive(Debug, Clone)]
pub struct FloodsubConfig {}
impl FloodsubConfig {
#[inline]
pub fn new() -> FloodsubConfig {
FloodsubConfig {}
}
}
impl UpgradeInfo for FloodsubConfig {
type Info = &'static [u8];
type InfoIter = iter::Once<Self::Info>;
#[inline]
fn protocol_info(&self) -> Self::InfoIter {
iter::once(b"/floodsub/1.0.0")
}
}
impl<TSocket> InboundUpgrade<TSocket> for FloodsubConfig
where
TSocket: AsyncRead + AsyncWrite,
{
type Output = Framed<TSocket, FloodsubCodec>;
type Error = io::Error;
type Future = future::FutureResult<Self::Output, Self::Error>;
#[inline]
fn upgrade_inbound(self, socket: TSocket, _: Self::Info) -> Self::Future {
future::ok(Framed::new(socket, FloodsubCodec { length_prefix: Default::default() }))
}
}
impl<TSocket> OutboundUpgrade<TSocket> for FloodsubConfig
where
TSocket: AsyncRead + AsyncWrite,
{
type Output = Framed<TSocket, FloodsubCodec>;
type Error = io::Error;
type Future = future::FutureResult<Self::Output, Self::Error>;
#[inline]
fn upgrade_outbound(self, socket: TSocket, _: Self::Info) -> Self::Future {
future::ok(Framed::new(socket, FloodsubCodec { length_prefix: Default::default() }))
}
}
pub struct FloodsubCodec {
length_prefix: codec::UviBytes,
}
impl Encoder for FloodsubCodec {
type Item = FloodsubRpc;
type Error = io::Error;
fn encode(&mut self, item: Self::Item, dst: &mut BytesMut) -> Result<(), Self::Error> {
let mut proto = rpc_proto::RPC::new();
for message in item.messages.into_iter() {
let mut msg = rpc_proto::Message::new();
msg.set_from(message.source.into_bytes());
msg.set_data(message.data);
msg.set_seqno(message.sequence_number);
msg.set_topicIDs(
message
.topics
.into_iter()
.map(TopicHash::into_string)
.collect(),
);
proto.mut_publish().push(msg);
}
for topic in item.subscriptions.into_iter() {
let mut subscription = rpc_proto::RPC_SubOpts::new();
subscription.set_subscribe(topic.action == FloodsubSubscriptionAction::Subscribe);
subscription.set_topicid(topic.topic.into_string());
proto.mut_subscriptions().push(subscription);
}
let msg_size = proto.compute_size();
dst.reserve(msg_size as usize + 5);
proto
.write_length_delimited_to_writer(&mut dst.by_ref().writer())
.expect(
"there is no situation in which the protobuf message can be invalid, and \
writing to a BytesMut never fails as we reserved enough space beforehand",
);
Ok(())
}
}
impl Decoder for FloodsubCodec {
type Item = FloodsubRpc;
type Error = io::Error;
fn decode(&mut self, src: &mut BytesMut) -> Result<Option<Self::Item>, Self::Error> {
let packet = match self.length_prefix.decode(src)? {
Some(p) => p,
None => return Ok(None),
};
let mut rpc: rpc_proto::RPC = protobuf::parse_from_bytes(&packet)?;
let mut messages = Vec::with_capacity(rpc.get_publish().len());
for mut publish in rpc.take_publish().into_iter() {
messages.push(FloodsubMessage {
source: PeerId::from_bytes(publish.take_from()).map_err(|_| {
io::Error::new(io::ErrorKind::InvalidData, "Invalid peer ID in message")
})?,
data: publish.take_data(),
sequence_number: publish.take_seqno(),
topics: publish
.take_topicIDs()
.into_iter()
.map(|topic| TopicHash::from_raw(topic))
.collect(),
});
}
Ok(Some(FloodsubRpc {
messages,
subscriptions: rpc
.take_subscriptions()
.into_iter()
.map(|mut sub| FloodsubSubscription {
action: if sub.get_subscribe() {
FloodsubSubscriptionAction::Subscribe
} else {
FloodsubSubscriptionAction::Unsubscribe
},
topic: TopicHash::from_raw(sub.take_topicid()),
})
.collect(),
}))
}
}
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct FloodsubRpc {
pub messages: Vec<FloodsubMessage>,
pub subscriptions: Vec<FloodsubSubscription>,
}
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct FloodsubMessage {
pub source: PeerId,
pub data: Vec<u8>,
pub sequence_number: Vec<u8>,
pub topics: Vec<TopicHash>,
}
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct FloodsubSubscription {
pub action: FloodsubSubscriptionAction,
pub topic: TopicHash,
}
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub enum FloodsubSubscriptionAction {
Subscribe,
Unsubscribe,
}