90 lines
2.5 KiB
Rust
90 lines
2.5 KiB
Rust
use std::collections::BTreeMap;
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use rand::Rng;
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/// Test utilities for testing the buffer.
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use super::time::ReplicaId;
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#[cfg(test)]
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pub(crate) struct Network<T: Clone> {
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inboxes: BTreeMap<ReplicaId, Vec<Envelope<T>>>,
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all_messages: Vec<T>,
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}
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#[derive(Clone)]
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struct Envelope<T: Clone> {
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message: T,
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sender: ReplicaId,
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}
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impl<T: Clone> Network<T> {
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pub fn new() -> Self {
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Network {
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inboxes: BTreeMap::new(),
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all_messages: Vec::new(),
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}
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}
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pub fn add_peer(&mut self, id: ReplicaId) {
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self.inboxes.insert(id, Vec::new());
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}
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pub fn is_idle(&self) -> bool {
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self.inboxes.values().all(|i| i.is_empty())
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}
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pub fn broadcast<R>(&mut self, sender: ReplicaId, messages: Vec<T>, rng: &mut R)
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where
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R: Rng,
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{
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for (replica, inbox) in self.inboxes.iter_mut() {
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if replica != &sender {
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for message in &messages {
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let min_index = inbox
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.iter()
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.enumerate()
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.rev()
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.find_map(|(index, envelope)| {
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if sender == envelope.sender {
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Some(index + 1)
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} else {
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None
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}
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})
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.unwrap_or(0);
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// Insert one or more duplicates of this message *after* the previous
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// message delivered by this replica.
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for _ in 0..rng.gen_range(1..4) {
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let insertion_index = rng.gen_range(min_index..inbox.len() + 1);
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inbox.insert(
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insertion_index,
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Envelope {
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message: message.clone(),
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sender: sender.clone(),
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},
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);
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}
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}
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}
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}
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self.all_messages.extend(messages);
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}
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pub fn has_unreceived(&self, receiver: &ReplicaId) -> bool {
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!self.inboxes[receiver].is_empty()
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}
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pub fn receive<R>(&mut self, receiver: ReplicaId, rng: &mut R) -> Vec<T>
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where
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R: Rng,
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{
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let inbox = self.inboxes.get_mut(&receiver).unwrap();
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let count = rng.gen_range(0..inbox.len() + 1);
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inbox
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.drain(0..count)
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.map(|envelope| envelope.message)
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.collect()
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}
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}
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