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use crate::actor::{Actor, ActorContext, Addr};
use crate::message::{Get, Message, Put};
use crate::utils::{BoundedHashMap, BoundedHashSet};
use crate::Config;
use async_trait::async_trait;
use log::{debug, error, info};
use rand::{seq::IteratorRandom, thread_rng};
use std::collections::{HashMap, HashSet};
use std::sync::atomic::{AtomicUsize, Ordering};
static SEEN_MSGS_MAX_SIZE: usize = 10000;
struct SeenGetMessage {
from: Addr,
last_reply_checksum: Option<i32>,
}
pub struct Router {
config: Config,
known_peers: HashSet<Addr>, // ping them periodically to remove closed addrs? and sort by timestamp & prefer long-lasting conns
storage_adapters: HashSet<Addr>,
network_adapters: HashSet<Addr>,
storage_adapter_actors: Vec<Box<dyn Actor>>,
network_adapter_actors: Vec<Box<dyn Actor>>,
server_peers: HashSet<Addr>, // temporary, so we can forward stuff to outgoing websocket peers (servers)
seen_messages: BoundedHashSet,
seen_get_messages: BoundedHashMap<String, SeenGetMessage>,
subscribers_by_topic: HashMap<String, HashSet<Addr>>,
msg_counter: AtomicUsize,
}
#[async_trait]
impl Actor for Router {
/// Listen to incoming messages and start [Actor]s
async fn pre_start(&mut self, ctx: &ActorContext) {
while let Some(adapter) = self.storage_adapter_actors.pop() {
let addr = ctx.start_actor(adapter);
self.storage_adapters.insert(addr);
}
while let Some(adapter) = self.network_adapter_actors.pop() {
let subscribe_to_everything = adapter.subscribe_to_everything();
let addr = ctx.start_actor(adapter);
self.network_adapters.insert(addr.clone());
if subscribe_to_everything {
self.server_peers.insert(addr);
}
}
if self.config.stats {
self.update_stats();
}
}
async fn stopping(&mut self, _ctx: &ActorContext) {
info!("Router stopping");
}
async fn handle(&mut self, msg: Message, _ctx: &ActorContext) {
debug!("incoming message {}", msg.clone().to_string());
match msg {
Message::Put(put) => self.handle_put(put),
Message::Get(get) => self.handle_get(get),
Message::Hi { from, peer_id: _ } => {
self.known_peers.insert(from);
}
};
}
}
impl Router {
pub fn new(
config: Config,
storage_adapter_actors: Vec<Box<dyn Actor>>,
network_adapter_actors: Vec<Box<dyn Actor>>,
) -> Self {
Self {
config,
known_peers: HashSet::new(),
storage_adapters: HashSet::new(),
network_adapters: HashSet::new(),
storage_adapter_actors,
network_adapter_actors,
server_peers: HashSet::new(),
seen_messages: BoundedHashSet::new(SEEN_MSGS_MAX_SIZE),
seen_get_messages: BoundedHashMap::new(SEEN_MSGS_MAX_SIZE),
subscribers_by_topic: HashMap::new(),
msg_counter: AtomicUsize::new(0),
}
}
fn update_stats(&self) {
/*
let mut stats = node.get("node_stats").get(&peer_id);
let start_time = Instant::now();
let msg_counter = self.msg_counter;
ctx.child_task(async move {
let mut sys = System::new_all();
loop { // TODO break
sys.refresh_all();
stats.get("msgs_per_second").put(msg_counter.load(Ordering::Relaxed).into());
msg_counter.store(0, Ordering::Relaxed);
stats.get("total_memory").put(format!("{} MB", sys.total_memory() / 1000).into());
stats.get("used_memory").put(format!("{} MB", sys.used_memory() / 1000).into());
stats.get("cpu_usage").put(format!("{} %", sys.global_processor_info().cpu_usage() as u64).into());
let uptime_secs = start_time.elapsed().as_secs();
let uptime;
if uptime_secs <= 60 {
uptime = format!("{} seconds", uptime_secs);
} else if uptime_secs <= 2 * 60 * 60 {
uptime = format!("{} minutes", uptime_secs / 60);
} else {
uptime = format!("{} hours", uptime_secs / 60 / 60);
}
stats.get("process_uptime").put(uptime.into());
sleep(Duration::from_millis(1000)).await;
}
});
*/
}
// record subscription & relay
fn handle_get(&mut self, get: Get) {
if !get.id.chars().all(char::is_alphanumeric) {
error!("id {}", get.id);
}
if self.is_message_seen(&get.id) {
return;
}
let seen_get_message = SeenGetMessage {
from: get.from.clone(),
last_reply_checksum: get.checksum.clone(),
};
self.seen_get_messages
.insert(get.id.clone(), seen_get_message);
// Record subscriber
let topic = get.node_id.split("/").next().unwrap_or("");
debug!("{} subscribed to {}", get.from, topic);
self.subscribers_by_topic
.entry(topic.to_string())
.or_insert_with(HashSet::new)
.insert(get.from.clone());
// Ask storage
for addr in self.storage_adapters.iter() {
let _ = addr.send(Message::Get(get.clone()));
}
let mut already_sent_to = HashSet::new();
// Send to server peers
for addr in self.server_peers.iter() {
debug!("send to server peer");
let _ = addr.send(Message::Get(get.clone()));
already_sent_to.insert(addr.clone());
}
// Ask network
let mut errored = HashSet::new();
let mut sent_to = 0;
let mut rng = thread_rng();
if let Some(topic_subscribers) = self.subscribers_by_topic.get(topic) {
// should have a list of all peers and send to those who are the likeliest to respond (MANET)
let sample = topic_subscribers.iter().choose_multiple(&mut rng, 4);
for addr in sample {
if get.from == *addr {
continue;
}
if already_sent_to.contains(addr) {
continue;
}
already_sent_to.insert(addr.clone());
match addr.send(Message::Get(get.clone())) {
Ok(_) => {
sent_to += 1;
}
_ => {
errored.insert(addr.clone());
}
}
}
}
debug!(
"sent get to a random sample of subscribers of size {}",
sent_to
);
if errored.len() > 0 {
if let Some(topic_subscribers) = self.subscribers_by_topic.get_mut(topic) {
for addr in errored {
topic_subscribers.remove(&addr);
self.known_peers.remove(&addr);
}
}
}
if sent_to < 4 {
let mut errored = HashSet::new();
while let Some(addr) = self.known_peers.iter().choose(&mut rng) {
sent_to += 1;
if sent_to >= 4 {
break;
}
if get.from == *addr {
continue;
}
if already_sent_to.contains(addr) {
continue;
}
already_sent_to.insert(addr.clone());
match addr.send(Message::Get(get.clone())) {
Ok(_) => {}
_ => {
errored.insert(addr.clone());
}
}
}
for addr in errored {
self.known_peers.remove(&addr);
}
}
}
// relay to original requester or all subscribers
fn handle_put(&mut self, put: Put) {
if self.is_message_seen(&put.id) {
return;
}
match &put.in_response_to {
Some(in_response_to) => {
if let Some(seen_get_message) = self.seen_get_messages.get_mut(in_response_to) {
if put.checksum != None && put.checksum == seen_get_message.last_reply_checksum
{
debug!("same reply already sent");
return;
} // failing these conditions, should we still send the ack to someone?
seen_get_message.last_reply_checksum = put.checksum.clone();
let _ = seen_get_message.from.send(Message::Put(put));
}
}
_ => {
// Save to storage
for addr in self.storage_adapters.iter() {
if put.from == *addr {
continue;
}
let _ = addr.send(Message::Put(put.clone()));
debug!("sent to adapter {}", addr);
}
let mut already_sent_to = HashSet::new();
// Send to server peers
for addr in self.server_peers.iter() {
if put.from == *addr {
continue;
}
let _ = addr.send(Message::Put(put.clone()));
already_sent_to.insert(addr.clone());
}
// Relay to subscribers
let mut sent_to = 0;
for node_id in put.clone().updated_nodes.keys() {
let topic = node_id.split("/").next().unwrap_or("");
if let Some(topic_subscribers) = self.subscribers_by_topic.get_mut(topic) {
topic_subscribers.retain(|addr| {
// send & remove closed addresses
if put.from == *addr {
return true;
}
if already_sent_to.contains(addr) {
return true;
}
already_sent_to.insert(addr.clone());
match addr.send(Message::Put(put.clone())) {
Ok(_) => {
sent_to += 1;
true
}
_ => false,
}
})
}
}
debug!("sent put to {} subscribers", already_sent_to.len());
if already_sent_to.len() < 4 {
let mut rng = thread_rng();
let mut errored = HashSet::new();
while let Some(addr) = self.known_peers.iter().choose(&mut rng) {
sent_to += 1;
if sent_to >= 4 {
break;
}
// TODO: seems like the following is necessary, but it causes a test to fail
if already_sent_to.contains(addr) {
continue;
}
already_sent_to.insert(addr.clone());
if put.from == *addr {
continue;
}
match addr.send(Message::Put(put.clone())) {
Ok(_) => {
debug!("sent put to random dude");
}
_ => {
errored.insert(addr.clone());
}
}
}
for addr in errored {
self.known_peers.remove(&addr);
}
}
}
};
}
fn is_message_seen(&mut self, id: &String) -> bool {
self.msg_counter.fetch_add(1, Ordering::Relaxed);
if self.seen_messages.contains(id) {
debug!("already seen message {}", id);
return true;
}
self.seen_messages.insert(id.clone());
return false;
}
}