1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
|
//! 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;
mod ctrl;
pub use ctrl::GossipRequest;
pub use ctrl::GossipReply;
mod msg;
pub use msg::GossipMessage;
#[derive(Debug)]
pub struct GossipReactor {
inner: Reactor<GossipRequest, GossipReply>,
gossip_topic_name: String,
}
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
}
fn send_gossip_reply(channel: ReplyChannel<GossipReply>, reply: GossipReply) -> Result<()> {
if let Err(_) = channel.send(ReactorReply::Custom(reply)) {
anyhow::bail!("Failed to send GossipReply::NoHead)")
}
Ok(())
}
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)) => self.publish_me(reply_channel).await
}
}
async fn publish_me(&self, reply_channel: ReplyChannel<GossipReply>) -> Result<()> {
let profile = self.inner.profile();
let profile = profile.read().await;
let head = profile.head();
if head.is_none() {
Self::send_gossip_reply(reply_channel, GossipReply::NoHead)?;
return Ok(())
}
let head = head.unwrap().to_bytes();
let own_id = match profile.client().own_id().await {
Ok(id) => id,
Err(e) => {
Self::send_gossip_reply(reply_channel, GossipReply::PublishMeResult(Err(e)))?;
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(()) => Self::send_gossip_reply(reply_channel, GossipReply::PublishMeResult(Ok(()))),
Err(e) => Self::send_gossip_reply(reply_channel, GossipReply::PublishMeResult(Err(e))),
}
}
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(())
}
}
|
