From 5856b8b59044c5c3dc007a35191931fb13b6aef1 Mon Sep 17 00:00:00 2001
From: Matthias Beyer <mail@beyermatthias.de>
Date: Fri, 10 Dec 2021 17:56:57 +0100
Subject: Add implementation for first GossipMessage

Signed-off-by: Matthias Beyer <mail@beyermatthias.de>
---
 lib/src/reactor/gossip.rs | 114 +++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 108 insertions(+), 6 deletions(-)

diff --git a/lib/src/reactor/gossip.rs b/lib/src/reactor/gossip.rs
index ba950db..0da0c97 100644
--- a/lib/src/reactor/gossip.rs
+++ b/lib/src/reactor/gossip.rs
@@ -21,22 +21,48 @@ 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>>) -> (Self, ReactorSender<GossipRequest, GossipReply>) {
+    pub fn new(profile: Arc<RwLock<Profile>>, gossip_topic_name: String) -> (Self, ReactorSender<GossipRequest, GossipReply>) {
         let (inner, sender) = Reactor::<GossipRequest, GossipReply>::new(profile);
-        (Self { inner }, sender)
+        let reactor = Self {
+            inner,
+            gossip_topic_name,
+        };
+
+        (reactor, sender)
     }
 
     pub async fn receive_next_message(&mut self) -> Option<(ReactorRequest<GossipRequest>, ReplyChannel<GossipReply>)> {
@@ -52,15 +78,91 @@ impl GossipReactor {
                 }
 
                 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 {
-            match self.receive_next_message().await {
-                None => break,
-                Some(tpl) => self.process_reactor_message(tpl).await?,
+            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(())
-- 
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