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|
//! Low-level module for gossip'ing code
//!
//! This module implements the low-level gossiping functionality that other modules use to
//! implement actual behaviours on
//!
use std::sync::Arc;
use anyhow::Result;
use tokio::sync::RwLock;
use crate::profile::Profile;
use crate::reactor::Reactor;
use crate::reactor::ReactorReply;
use crate::reactor::ReactorRequest;
use crate::reactor::ctrl::ReactorReceiver;
use crate::reactor::ctrl::ReactorSender;
use crate::reactor::ctrl::ReplyChannel;
#[derive(Debug)]
pub struct GossipReactor {
inner: Reactor<GossipRequest, GossipReply>,
gossip_topic_name: String,
}
#[derive(Debug)]
pub enum GossipRequest {
Ping,
PublishMe,
}
#[derive(Debug)]
pub enum GossipReply {
Pong,
NoHead,
PublishMeResult(Result<()>),
}
#[derive(Debug, serde::Serialize, serde::Deserialize)]
pub enum GossipMessage {
CurrentProfileState {
peer_id: Vec<u8>,
cid: Vec<u8>,
},
}
impl GossipMessage {
fn into_bytes(self) -> Result<Vec<u8>> {
serde_json::to_string(&self)
.map(String::into_bytes)
.map_err(anyhow::Error::from)
}
}
impl GossipReactor {
pub fn new(profile: Arc<RwLock<Profile>>, gossip_topic_name: String) -> (Self, ReactorSender<GossipRequest, GossipReply>) {
let (inner, sender) = Reactor::<GossipRequest, GossipReply>::new(profile);
let reactor = Self {
inner,
gossip_topic_name,
};
(reactor, sender)
}
pub async fn receive_next_message(&mut self) -> Option<(ReactorRequest<GossipRequest>, ReplyChannel<GossipReply>)> {
self.inner.receive_next_message().await
}
pub(super) async fn process_reactor_message(&mut self, request: (ReactorRequest<GossipRequest>, ReplyChannel<GossipReply>)) -> Result<()> {
match self.inner.process_reactor_message(request).await? {
None => Ok(()),
Some((GossipRequest::Ping, reply_channel)) => {
if let Err(_) = reply_channel.send(ReactorReply::Custom(GossipReply::Pong)) {
anyhow::bail!("Failed sening PONG reply")
}
Ok(())
},
Some((GossipRequest::PublishMe, reply_channel)) => {
let profile = self.inner.profile();
let profile = profile.read().await;
let head = profile.head();
if head.is_none() {
if let Err(_) = reply_channel.send(ReactorReply::Custom(GossipReply::NoHead)) {
anyhow::bail!("Failed to send GossipReply::NoHead)")
}
}
let head = head.unwrap().to_bytes();
let own_id = match profile.client().own_id().await {
Ok(id) => id,
Err(e) => if let Err(_) = reply_channel.send(ReactorReply::Custom(GossipReply::PublishMeResult(Err(e)))) {
anyhow::bail!("Failed to send GossipReply::PublishMeResult(Err(_))")
} else {
return Ok(()) // TODO: abort operation here for now, maybe not the best idea
}
};
let publish_res = profile
.client()
.ipfs
.pubsub_publish(self.gossip_topic_name.clone(), GossipMessage::CurrentProfileState {
peer_id: own_id.to_bytes(),
cid: head
}.into_bytes()?)
.await;
match publish_res {
Ok(()) => if let Err(_) = reply_channel.send(ReactorReply::Custom(GossipReply::PublishMeResult(Ok(())))) {
anyhow::bail!("Failed to send GossipReply::PublishMeResult(Ok(()))")
} else {
Ok(())
},
Err(e) => if let Err(_) = reply_channel.send(ReactorReply::Custom(GossipReply::PublishMeResult(Err(e)))) {
anyhow::bail!("Failed to send GossipReply::PublishMeResult(Err(_))")
} else {
Ok(())
}
}
},
}
}
pub async fn run(mut self) -> Result<()> {
use std::convert::TryFrom;
use futures::stream::StreamExt;
let mut subscription_stream = self.inner.profile()
.read()
.await
.client()
.ipfs
.pubsub_subscribe(self.gossip_topic_name.clone())
.await?;
loop {
tokio::select! {
next_control_msg = self.receive_next_message() => {
match next_control_msg {
None => break,
Some(tpl) => self.process_reactor_message(tpl).await?,
}
}
next_gossip_message = subscription_stream.next() => {
if let Some(next_gossip_message) = next_gossip_message {
match serde_json::from_slice(&next_gossip_message.data) {
Err(e) => log::trace!("Failed to deserialize gossip message from {}", next_gossip_message.source),
Ok(GossipMessage::CurrentProfileState { peer_id, cid }) => {
let peer_id = ipfs::PeerId::from_bytes(&peer_id);
let cid = cid::Cid::try_from(&*cid);
log::trace!("Peer {:?} is at {:?}", peer_id, cid)
}
}
} else {
break;
}
}
}
}
Ok(())
}
}
|
