Ununderstandable error

This commit is contained in:
Alex Auvolat 2020-04-06 22:27:51 +02:00
parent 3c36b449a3
commit 87f2b4d2fc
4 changed files with 188 additions and 40 deletions

View file

@ -1,9 +1,23 @@
use std::collections::HashMap;
use serde::{Serialize, Deserialize};
pub type UUID = [u8; 32];
pub type Hash = [u8; 32];
// Network management
#[derive(Clone, Debug, Serialize, Deserialize)]
pub struct NetworkConfig {
pub members: HashMap<UUID, NetworkConfigEntry>,
pub version: u64,
}
#[derive(Clone, Debug, Serialize, Deserialize)]
pub struct NetworkConfigEntry {
pub n_tokens: u32,
}
// Data management
#[derive(Debug, Serialize, Deserialize)]

View file

@ -29,33 +29,41 @@ 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,
pub config: NetworkConfig,
}
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()),
}
fn handle_ping(&mut self, ip: IpAddr, info: &PingMessage) -> bool {
self.status.insert(info.id.clone(),
NodeStatus{
addr: SocketAddr::new(ip, info.rpc_port),
remaining_ping_attempts: MAX_FAILED_PINGS,
});
}).is_none()
}
fn handle_advertise_node(&mut self, id: &UUID, addr: &SocketAddr) -> bool {
if !self.status.contains_key(id) {
self.status.insert(id.clone(),
NodeStatus{
addr: addr.clone(),
remaining_ping_attempts: MAX_FAILED_PINGS,
});
true
} else {
false
}
}
fn recalculate_status_hash(&mut self) {
let mut nodes = self.status.iter().collect::<Vec<_>>();
nodes.sort_by_key(|(id, _status)| *id);
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));
}
for (id, status) in nodes {
hasher.input(format!("{} {}\n", hex::encode(id), status.addr));
}
self.status_hash.copy_from_slice(&hasher.result()[..]);
}
@ -66,9 +74,6 @@ pub struct NodeStatus {
pub remaining_ping_attempts: usize,
}
pub struct NodeConfig {
pub n_tokens: u32,
}
impl System {
pub fn new(config: Config, id: UUID) -> Self {
@ -77,26 +82,31 @@ impl System {
id,
rpc_client: Client::new(),
members: RwLock::new(Members{
present: Vec::new(),
status: HashMap::new(),
status_hash: [0u8; 32],
config: HashMap::new(),
config_version: 0,
config: NetworkConfig{
members: HashMap::new(),
version: 0,
},
}),
}
}
pub async fn make_ping(&self) -> Message {
let members = self.members.read().await;
Message::Ping(PingMessage{
id: self.id,
rpc_port: self.config.rpc_port,
present_hash: self.members.read().await.status_hash.clone(),
config_version: 0,
status_hash: members.status_hash.clone(),
config_version: members.config.version,
})
}
pub async fn broadcast(&self) -> Vec<UUID> {
self.members.read().await.present.clone()
pub async fn broadcast(self: Arc<Self>, msg: Message, timeout: Duration) {
let members = self.members.read().await;
let to = members.status.keys().cloned().collect::<Vec<_>>();
drop(members);
rpc_call_many(self.clone(), &to[..], &msg, None, timeout).await;
}
pub async fn bootstrap(self: Arc<Self>) {
@ -115,19 +125,12 @@ impl System {
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);
let resps = rpc_call_many_addr(self.clone(),
&self.config.bootstrap_peers,
&ping_msg,
None,
PING_TIMEOUT).await;
unimplemented!() //TODO
tokio::spawn(self.ping_loop());
}
pub async fn handle_ping(self: Arc<Self>,
@ -136,17 +139,141 @@ impl System {
-> Result<Message, Error>
{
let mut members = self.members.write().await;
members.handle_ping(from.ip(), ping);
let is_new = members.handle_ping(from.ip(), ping);
members.recalculate_status_hash();
let status_hash = members.status_hash.clone();
let config_version = members.config.version;
drop(members);
if is_new || status_hash != ping.status_hash {
tokio::spawn(self.clone().pull_status(ping.id.clone()));
}
if is_new || config_version < ping.config_version {
tokio::spawn(self.clone().pull_config(ping.id.clone()));
}
Ok(self.make_ping().await)
}
pub async fn handle_advertise_node(self: Arc<Self>,
ping: &AdvertiseNodeMessage)
pub async fn handle_pull_status(&self) -> Result<Message, Error> {
let members = self.members.read().await;
let mut mem = vec![];
for (node, status) in members.status.iter() {
mem.push(AdvertisedNode{
id: node.clone(),
addr: status.addr.clone(),
});
}
Ok(Message::AdvertiseNodesUp(mem))
}
pub async fn handle_pull_config(&self) -> Result<Message, Error> {
let members = self.members.read().await;
Ok(Message::AdvertiseConfig(members.config.clone()))
}
pub async fn handle_advertise_nodes_up(self: Arc<Self>,
adv: &[AdvertisedNode])
-> Result<Message, Error>
{
unimplemented!() //TODO
let mut propagate = vec![];
let mut members = self.members.write().await;
for node in adv.iter() {
let is_new = members.handle_advertise_node(&node.id, &node.addr);
if is_new {
tokio::spawn(self.clone().pull_status(node.id.clone()));
tokio::spawn(self.clone().pull_config(node.id.clone()));
propagate.push(node.clone());
}
}
if propagate.len() > 0 {
tokio::spawn(self.clone().broadcast(Message::AdvertiseNodesUp(propagate), PING_TIMEOUT));
}
Ok(Message::Ok)
}
pub async fn handle_advertise_config(self: Arc<Self>,
adv: &NetworkConfig)
-> Result<Message, Error>
{
let mut members = self.members.write().await;
if adv.version > members.config.version {
members.config = adv.clone();
tokio::spawn(self.clone().broadcast(Message::AdvertiseConfig(adv.clone()), PING_TIMEOUT));
}
Ok(Message::Ok)
}
pub async fn ping_loop(self: Arc<Self>) {
loop {
let restart_at = tokio::time::delay_for(PING_INTERVAL);
let members = self.members.read().await;
let ping_addrs = members.status.iter()
.map(|(id, status)| (id.clone(), status.addr.clone()))
.collect::<Vec<_>>();
drop(members);
let ping_msg = self.make_ping().await;
let ping_resps = join_all(
ping_addrs.iter()
.map(|(id, addr)| {
let sys = self.clone();
let ping_msg_ref = &ping_msg;
async move {
(id, addr.clone(), rpc_call_addr(sys, &addr, ping_msg_ref, PING_TIMEOUT).await)
}
})).await;
let mut members = self.members.write().await;
for (id, addr, ping_resp) in ping_resps {
if let Ok(Message::Ping(ping)) = ping_resp {
let is_new = members.handle_ping(addr.ip(), &ping);
if is_new || members.status_hash != ping.status_hash {
tokio::spawn(self.clone().pull_status(ping.id.clone()));
}
if is_new || members.config.version < ping.config_version {
tokio::spawn(self.clone().pull_config(ping.id.clone()));
}
} else {
let remaining_attempts = members.status.get(id).map(|x| x.remaining_ping_attempts).unwrap_or(0);
if remaining_attempts == 0 {
eprintln!("Removing node {} after too many failed pings", hex::encode(id));
members.status.remove(id);
} else {
if let Some(st) = members.status.get_mut(id) {
st.remaining_ping_attempts = remaining_attempts - 1;
}
}
}
}
drop(members);
restart_at.await
}
}
pub async fn pull_status(self: Arc<Self>, peer: UUID) {
let resp = rpc_call(self.clone(),
&peer,
&Message::PullStatus,
PING_TIMEOUT).await;
if let Ok(Message::AdvertiseNodesUp(nodes)) = resp {
self.handle_advertise_nodes_up(&nodes).await;
}
}
pub async fn pull_config(self: Arc<Self>, peer: UUID) {
let resp = rpc_call(self.clone(),
&peer,
&Message::PullConfig,
PING_TIMEOUT).await;
if let Ok(Message::AdvertiseConfig(config)) = resp {
self.handle_advertise_config(&config).await;
}
}
}

View file

@ -9,7 +9,10 @@ pub enum Message {
Error(String),
Ping(PingMessage),
AdvertiseNode(AdvertiseNodeMessage),
PullStatus,
PullConfig,
AdvertiseNodesUp(Vec<AdvertisedNode>),
AdvertiseConfig(NetworkConfig),
}
#[derive(Debug, Serialize, Deserialize)]
@ -17,12 +20,12 @@ pub struct PingMessage {
pub id: UUID,
pub rpc_port: u16,
pub present_hash: Hash,
pub status_hash: Hash,
pub config_version: u64,
}
#[derive(Debug, Serialize, Deserialize)]
pub struct AdvertiseNodeMessage {
#[derive(Clone, Debug, Serialize, Deserialize)]
pub struct AdvertisedNode {
pub id: UUID,
pub addr: SocketAddr,
}

View file

@ -133,7 +133,11 @@ async fn handler(sys: Arc<System>, req: Request<Body>, addr: SocketAddr) -> Resu
let resp = err_to_msg(match &msg {
Message::Ping(ping) => sys.handle_ping(&addr, ping).await,
Message::AdvertiseNode(adv) => sys.handle_advertise_node(adv).await,
Message::PullStatus => sys.handle_pull_status().await,
Message::PullConfig => sys.handle_pull_config().await,
Message::AdvertiseNodesUp(adv) => sys.handle_advertise_nodes_up(adv).await,
Message::AdvertiseConfig(adv) => sys.handle_advertise_config(adv).await,
_ => Ok(Message::Error(format!("Unexpected message: {:?}", msg))),
});