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// Copyright 2017-2019 int08h LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//!
//! Facilities for tracking client requests to the server
//!
mod aggregated;
mod per_client;
use std::net::IpAddr;
use std::collections::hash_map::Iter;
pub use crate::stats::aggregated::AggregatedStats;
pub use crate::stats::per_client::PerClientStats;
///
/// Specific metrics tracked per each client
///
#[derive(Debug, Clone, Copy)]
pub struct ClientStatEntry {
pub valid_requests: u64,
pub invalid_requests: u64,
pub health_checks: u64,
pub responses_sent: u64,
pub bytes_sent: usize,
}
impl ClientStatEntry {
fn new() -> Self {
ClientStatEntry {
valid_requests: 0,
invalid_requests: 0,
health_checks: 0,
responses_sent: 0,
bytes_sent: 0,
}
}
}
///
/// Implementations of this trait record client activity
///
pub trait ServerStats {
fn add_valid_request(&mut self, addr: &IpAddr);
fn add_invalid_request(&mut self, addr: &IpAddr);
fn add_health_check(&mut self, addr: &IpAddr);
fn add_response(&mut self, addr: &IpAddr, bytes_sent: usize);
fn total_valid_requests(&self) -> u64;
fn total_invalid_requests(&self) -> u64;
fn total_health_checks(&self) -> u64;
fn total_responses_sent(&self) -> u64;
fn total_bytes_sent(&self) -> usize;
fn total_unique_clients(&self) -> u64;
fn stats_for_client(&self, addr: &IpAddr) -> Option<&ClientStatEntry>;
fn iter(&self) -> Iter<IpAddr, ClientStatEntry>;
fn clear(&mut self);
}
#[cfg(test)]
mod test {
use crate::stats::{ServerStats, PerClientStats};
use std::net::{IpAddr, Ipv4Addr};
#[test]
fn simple_stats_starts_empty() {
let stats = PerClientStats::new();
assert_eq!(stats.total_valid_requests(), 0);
assert_eq!(stats.total_invalid_requests(), 0);
assert_eq!(stats.total_health_checks(), 0);
assert_eq!(stats.total_responses_sent(), 0);
assert_eq!(stats.total_bytes_sent(), 0);
assert_eq!(stats.total_unique_clients(), 0);
assert_eq!(stats.num_overflows(), 0);
}
#[test]
fn client_requests_are_tracked() {
let mut stats = PerClientStats::new();
let ip1 = "127.0.0.1".parse().unwrap();
let ip2 = "127.0.0.2".parse().unwrap();
let ip3 = "127.0.0.3".parse().unwrap();
stats.add_valid_request(&ip1);
stats.add_valid_request(&ip2);
stats.add_valid_request(&ip3);
assert_eq!(stats.total_valid_requests(), 3);
stats.add_invalid_request(&ip2);
assert_eq!(stats.total_invalid_requests(), 1);
stats.add_response(&ip2, 8192);
assert_eq!(stats.total_bytes_sent(), 8192);
assert_eq!(stats.total_unique_clients(), 3);
}
#[test]
fn per_client_stats() {
let mut stats = PerClientStats::new();
let ip = "127.0.0.3".parse().unwrap();
stats.add_valid_request(&ip);
stats.add_response(&ip, 2048);
stats.add_response(&ip, 1024);
let entry = stats.stats_for_client(&ip).unwrap();
assert_eq!(entry.valid_requests, 1);
assert_eq!(entry.invalid_requests, 0);
assert_eq!(entry.responses_sent, 2);
assert_eq!(entry.bytes_sent, 3072);
}
#[test]
fn overflow_max_entries() {
let mut stats = PerClientStats::with_limit(100);
for i in 0..201 {
let ipv4 = Ipv4Addr::from(i as u32);
let addr = IpAddr::from(ipv4);
stats.add_valid_request(&addr);
};
assert_eq!(stats.total_unique_clients(), 100);
assert_eq!(stats.num_overflows(), 101);
}
}
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