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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.
use hashbrown::HashMap;
use hashbrown::hash_map::Iter;
use std::net::IpAddr;
use crate::stats::ClientStatEntry;
use crate::stats::ServerStats;
///
/// Implementation of `ServerStats` that provides granular per-client request/response counts.
///
/// Each unique client address is used to key a hashmap. A maximum of `MAX_CLIENTS` entries
/// are kept in the map to bound memory use. Excess entries beyond `MAX_CLIENTS` are ignored
/// and `num_overflows` is incremented.
///
pub struct PerClientStats {
clients: HashMap<IpAddr, ClientStatEntry>,
num_overflows: u64,
max_clients: usize,
}
impl Default for PerClientStats {
fn default() -> Self {
Self::new()
}
}
impl PerClientStats {
/// Maximum number of entries to prevent unbounded memory growth.
pub const MAX_CLIENTS: usize = 1_000_000;
pub fn new() -> Self {
PerClientStats {
clients: HashMap::with_capacity(64),
num_overflows: 0,
max_clients: PerClientStats::MAX_CLIENTS,
}
}
// visible for testing
#[cfg(test)]
pub fn with_limit(limit: usize) -> Self {
PerClientStats {
clients: HashMap::with_capacity(64),
num_overflows: 0,
max_clients: limit,
}
}
#[inline]
fn too_many_entries(&mut self) -> bool {
let too_big = self.clients.len() >= self.max_clients;
if too_big {
self.num_overflows += 1;
}
too_big
}
#[allow(dead_code)]
pub fn num_overflows(&self) -> u64 {
self.num_overflows
}
}
impl ServerStats for PerClientStats {
fn add_valid_request(&mut self, addr: &IpAddr) {
if self.too_many_entries() {
return;
}
self.clients
.entry(*addr)
.or_insert_with(ClientStatEntry::new)
.valid_requests += 1;
}
fn add_invalid_request(&mut self, addr: &IpAddr) {
if self.too_many_entries() {
return;
}
self.clients
.entry(*addr)
.or_insert_with(ClientStatEntry::new)
.invalid_requests += 1;
}
fn add_health_check(&mut self, addr: &IpAddr) {
if self.too_many_entries() {
return;
}
self.clients
.entry(*addr)
.or_insert_with(ClientStatEntry::new)
.health_checks += 1;
}
fn add_response(&mut self, addr: &IpAddr, bytes_sent: usize) {
if self.too_many_entries() {
return;
}
let entry = self.clients
.entry(*addr)
.or_insert_with(ClientStatEntry::new);
entry.responses_sent += 1;
entry.bytes_sent += bytes_sent;
}
fn total_valid_requests(&self) -> u64 {
self.clients
.values()
.map(|&v| v.valid_requests)
.sum()
}
fn total_invalid_requests(&self) -> u64 {
self.clients
.values()
.map(|&v| v.invalid_requests)
.sum()
}
fn total_health_checks(&self) -> u64 {
self.clients
.values()
.map(|&v| v.health_checks)
.sum()
}
fn total_responses_sent(&self) -> u64 {
self.clients
.values()
.map(|&v| v.responses_sent)
.sum()
}
fn total_bytes_sent(&self) -> usize {
self.clients
.values()
.map(|&v| v.bytes_sent)
.sum()
}
fn total_unique_clients(&self) -> u64 {
self.clients.len() as u64
}
fn stats_for_client(&self, addr: &IpAddr) -> Option<&ClientStatEntry> {
self.clients.get(addr)
}
fn iter(&self) -> Iter<IpAddr, ClientStatEntry> {
self.clients.iter()
}
fn clear(&mut self) {
self.clients.clear();
self.num_overflows = 0;
}
}
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