From 3c36b449a3786bb62fa023bde37bac24635b5717 Mon Sep 17 00:00:00 2001
From: Alex Auvolat <alex@adnab.me>
Date: Mon, 6 Apr 2020 21:02:15 +0200
Subject: Some work

---
 src/membership.rs | 110 +++++++++++++++++++++++++++++++++++++++++++-----------
 1 file changed, 88 insertions(+), 22 deletions(-)

(limited to 'src/membership.rs')

diff --git a/src/membership.rs b/src/membership.rs
index c14d370b..2c9cd1ca 100644
--- a/src/membership.rs
+++ b/src/membership.rs
@@ -1,10 +1,13 @@
 use std::sync::Arc;
 use std::collections::HashMap;
 use std::time::Duration;
-use std::net::SocketAddr;
+use std::net::{IpAddr, SocketAddr};
 
+use futures::future::join_all;
+use futures::stream::StreamExt;
 use hyper::client::Client;
 use tokio::sync::RwLock;
+use sha2::{Sha256, Digest};
 
 use crate::Config;
 use crate::error::Error;
@@ -28,14 +31,39 @@ pub struct System {
 pub struct Members {
 	pub present: Vec<UUID>,
 	pub status: HashMap<UUID, NodeStatus>,
+	pub status_hash: Hash,
 
 	pub config: HashMap<UUID, NodeConfig>,
 	pub config_version: u64,
 }
 
+impl Members {
+	fn handle_ping(&mut self, ip: IpAddr, info: &PingMessage) {
+		match self.present.binary_search(&info.id) {
+			Ok(pos) => {}
+			Err(pos) => self.present.insert(pos, info.id.clone()),
+		}
+		self.status.insert(info.id.clone(),
+			NodeStatus{
+				addr: SocketAddr::new(ip, info.rpc_port),
+				remaining_ping_attempts: MAX_FAILED_PINGS,
+			});
+	}
+
+	fn recalculate_status_hash(&mut self) {
+		let mut hasher = Sha256::new();
+		for node in self.present.iter() {
+			if let Some(status) = self.status.get(node) {
+				hasher.input(format!("{} {}\n", hex::encode(node), status.addr));
+			}
+		}
+		self.status_hash.copy_from_slice(&hasher.result()[..]);
+	}
+}
+
 pub struct NodeStatus {
 	pub addr: SocketAddr,
-	remaining_ping_attempts: usize,
+	pub remaining_ping_attempts: usize,
 }
 
 pub struct NodeConfig {
@@ -51,36 +79,74 @@ impl System {
 			members: RwLock::new(Members{
 				present: Vec::new(),
 				status: HashMap::new(),
+				status_hash: [0u8; 32],
 				config: HashMap::new(),
 				config_version: 0,
 			}),
 		}
 	}
 
+	pub async fn make_ping(&self) -> Message {
+		Message::Ping(PingMessage{
+			id: self.id,
+			rpc_port: self.config.rpc_port,
+			present_hash: self.members.read().await.status_hash.clone(),
+			config_version: 0,
+		})
+	}
+
 	pub async fn broadcast(&self) -> Vec<UUID> {
 		self.members.read().await.present.clone()
 	}
-}
 
-pub async fn bootstrap(system: Arc<System>) {
-	rpc_call_many_addr(system.clone(),
-					   &system.config.bootstrap_peers,
-					   &Message::Ping(PingMessage{
-						   id: system.id,
-						   rpc_port: system.config.rpc_port,
-						   present_hash: [0u8; 32],
-						   config_version: 0,
-					   }),
-					   None,
-					   PING_TIMEOUT).await;
-
-	unimplemented!() //TODO
-}
+	pub async fn bootstrap(self: Arc<Self>) {
+		let ping_msg = self.make_ping().await;
+		let ping_resps = join_all(
+			self.config.bootstrap_peers.iter().cloned()
+			.map(|to| {
+				let sys = self.clone();
+				let ping_msg_ref = &ping_msg;
+				async move {
+					(to.clone(), rpc_call_addr(sys, &to, ping_msg_ref, PING_TIMEOUT).await)
+				}
+			})).await;
+		
+		let mut members = self.members.write().await;
+		for (addr, ping_resp) in ping_resps {
+			if let Ok(Message::Ping(info)) = ping_resp {
+				members.handle_ping(addr.ip(), &info);
+
+			}
+		}
+		members.recalculate_status_hash();
+		drop(members);
 
-pub async fn handle_ping(sys: Arc<System>, from: &SocketAddr, ping: &PingMessage) -> Result<Message, Error> {
-	unimplemented!() //TODO
-}
+		let resps = rpc_call_many_addr(self.clone(),
+									   &self.config.bootstrap_peers,
+									   &ping_msg,
+									   None,
+									   PING_TIMEOUT).await;
 
-pub async fn handle_advertise_node(sys: Arc<System>, ping: &AdvertiseNodeMessage) -> Result<Message, Error> {
-	unimplemented!() //TODO
+		unimplemented!() //TODO
+	}
+
+	pub async fn handle_ping(self: Arc<Self>,
+							 from: &SocketAddr,
+							 ping: &PingMessage)
+		-> Result<Message, Error> 
+	{
+		let mut members = self.members.write().await;
+		members.handle_ping(from.ip(), ping);
+		members.recalculate_status_hash();
+		drop(members);
+
+		Ok(self.make_ping().await)
+	}
+
+	pub async fn handle_advertise_node(self: Arc<Self>,
+									   ping: &AdvertiseNodeMessage)
+		 -> Result<Message, Error>
+	{
+		unimplemented!() //TODO
+	}
 }
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