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|
//! Messages and bytes exchanged with each peer, by kind: counted where every message
//! passes anyway, at the transport. No messages of our own.
//!
//! Bytes are payload bytes, what the Mycelium message carries, without its framing,
//! the topic, or the base64 of its HTTP API. Counters only grow (from the start of the
//! process); rates are for whoever reads them.
//!
//! A message dropped by the debug firewall still counts as sent (the firewall plays a
//! lossy network) but not as received.
use std::collections::HashMap;
use std::sync::{Arc, Mutex, MutexGuard};
use anyhow::Result;
use async_trait::async_trait;
use serde::Serialize;
use utoipa::ToSchema;
use crate::transport::{EncodedMessage, MessageHandler, MessageKind, ParsedMessage, Transport};
#[derive(Debug, Default, Clone, Copy, Serialize, ToSchema)]
pub struct Counter {
pub messages: u64,
pub bytes: u64,
}
impl Counter {
fn add(&mut self, bytes: usize) {
self.messages += 1;
self.bytes += bytes as u64;
}
}
#[derive(Debug, Default, Clone, Copy, Serialize, ToSchema)]
#[serde(rename_all = "camelCase")]
pub struct ByKind {
pub hello: Counter,
pub hello_reply: Counter,
pub sync: Counter,
pub ping: Counter,
pub pong: Counter,
}
impl ByKind {
fn get_mut(&mut self, kind: MessageKind) -> &mut Counter {
match kind {
MessageKind::Hello => &mut self.hello,
MessageKind::HelloReply => &mut self.hello_reply,
MessageKind::Sync => &mut self.sync,
MessageKind::Ping => &mut self.ping,
MessageKind::Pong => &mut self.pong,
}
}
}
#[derive(Debug, Default, Clone, Copy, Serialize, ToSchema)]
#[serde(rename_all = "camelCase")]
pub struct PeerTraffic {
/// Handed to Mycelium (it accepted them).
pub sent: ByKind,
pub received: ByKind,
/// Sends Mycelium refused (e.g. no route to the peer); not counted as sent.
pub refused: ByKind,
}
#[derive(Debug, Default)]
struct Table {
peers: HashMap<String, PeerTraffic>,
/// All peers, including ones no longer listed.
total: PeerTraffic,
}
#[derive(Debug, Default)]
pub struct Traffic {
table: Mutex<Table>,
}
impl Traffic {
fn lock(&self) -> MutexGuard<'_, Table> {
self.table
.lock()
.unwrap_or_else(|poisoned| poisoned.into_inner())
}
fn count(&self, peer: &str, bytes: usize, pick: impl Fn(&mut PeerTraffic) -> &mut Counter) {
let mut guard = self.lock();
let table = &mut *guard;
pick(&mut table.total).add(bytes);
match table.peers.get_mut(peer) {
Some(traffic) => pick(traffic).add(bytes),
None => pick(table.peers.entry(peer.to_owned()).or_default()).add(bytes),
}
}
fn sent(&self, peer: &str, kind: MessageKind, bytes: usize) {
self.count(peer, bytes, |t| t.sent.get_mut(kind));
}
fn refused(&self, peer: &str, kind: MessageKind, bytes: usize) {
self.count(peer, bytes, |t| t.refused.get_mut(kind));
}
fn received(&self, peer: &str, kind: MessageKind, bytes: usize) {
self.count(peer, bytes, |t| t.received.get_mut(kind));
}
pub fn peer(&self, peer: &str) -> Option<PeerTraffic> {
self.lock().peers.get(peer).copied()
}
pub fn total(&self) -> PeerTraffic {
self.lock().total
}
/// Drops the counters of peers not kept (anyone can send us messages; the totals
/// keep their share).
pub fn retain(&self, mut keep: impl FnMut(&str) -> bool) {
self.lock().peers.retain(|peer, _| keep(peer));
}
}
/// Counts what passes through `inner`.
pub struct CountingTransport {
inner: Arc<dyn Transport>,
traffic: Arc<Traffic>,
}
impl CountingTransport {
pub fn new(inner: Arc<dyn Transport>, traffic: Arc<Traffic>) -> Self {
Self { inner, traffic }
}
}
#[async_trait]
impl Transport for CountingTransport {
fn local_id(&self) -> &str {
self.inner.local_id()
}
async fn resolve_seed(&self, seed: &str) -> Result<String> {
self.inner.resolve_seed(seed).await
}
fn encode(&self, peer: &str, message: &ParsedMessage) -> Result<EncodedMessage> {
self.inner.encode(peer, message)
}
async fn send_encoded(&self, message: &EncodedMessage) -> Result<()> {
let result = self.inner.send_encoded(message).await;
if result.is_ok() {
self.traffic
.sent(&message.peer, message.kind, message.payload_len);
} else {
self.traffic
.refused(&message.peer, message.kind, message.payload_len);
}
result
}
async fn start_consumer(&self, handler: MessageHandler) -> Result<()> {
let traffic = Arc::clone(&self.traffic);
self.inner
.start_consumer(Box::new(move |sender, message, payload_len| {
traffic.received(&sender, message.kind(), payload_len);
handler(sender, message, payload_len)
}))
.await
}
async fn wait_for_exit(&self) -> std::io::Result<std::process::ExitStatus> {
self.inner.wait_for_exit().await
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn totals_survive_retain() {
let traffic = Traffic::default();
traffic.sent("a", MessageKind::Ping, 100);
traffic.sent("b", MessageKind::Sync, 1000);
traffic.received("b", MessageKind::Pong, 90);
traffic.refused("a", MessageKind::Sync, 500);
let b = traffic.peer("b").unwrap();
assert_eq!(b.sent.sync.messages, 1);
assert_eq!(b.received.pong.bytes, 90);
traffic.retain(|peer| peer == "b");
assert!(traffic.peer("a").is_none());
let total = traffic.total();
assert_eq!(total.sent.ping.bytes, 100);
assert_eq!(total.sent.sync.bytes, 1000);
assert_eq!(total.refused.sync.bytes, 500);
}
}
|
