proxmox-backup/src/shared_rate_limiter.rs

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Rust
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use std::path::PathBuf;
use std::mem::MaybeUninit;
use std::time::{Instant, Duration};
use anyhow::{bail, Error};
use nix::sys::stat::Mode;
use proxmox::tools::fs::{create_path, CreateOptions};
use proxmox_http::client::{RateLimit, RateLimiter, ShareableRateLimit};
use proxmox_shared_memory::{Init, SharedMemory, SharedMutex};
use proxmox_shared_memory::{check_subtype, initialize_subtype};
// openssl::sha::sha256(b"Proxmox Backup SharedRateLimiter v1.0")[0..8];
pub const PROXMOX_BACKUP_SHARED_RATE_LIMITER_MAGIC_1_0: [u8; 8] = [6, 58, 213, 96, 161, 122, 130, 117];
const BASE_PATH: &str = pbs_buildcfg::rundir!("/shmem/tbf");
// Wrap RateLimiter, so that we can provide an Init impl
#[repr(C)]
struct WrapLimiter(RateLimiter);
impl Init for WrapLimiter {
fn initialize(this: &mut MaybeUninit<Self>) {
// default does not matter here, because we override later
this.write(WrapLimiter(RateLimiter::new(1_000_000, 1_000_000)));
}
}
#[repr(C)]
struct SharedRateLimiterData {
magic: [u8; 8],
tbf: SharedMutex<WrapLimiter>,
padding: [u8; 4096 - 120],
}
impl Init for SharedRateLimiterData {
fn initialize(this: &mut MaybeUninit<Self>) {
unsafe {
let me = &mut *this.as_mut_ptr();
me.magic = PROXMOX_BACKUP_SHARED_RATE_LIMITER_MAGIC_1_0;
initialize_subtype(&mut me.tbf);
}
}
fn check_type_magic(this: &MaybeUninit<Self>) -> Result<(), Error> {
unsafe {
let me = &*this.as_ptr();
if me.magic != PROXMOX_BACKUP_SHARED_RATE_LIMITER_MAGIC_1_0 {
bail!("SharedRateLimiterData: wrong magic number");
}
check_subtype(&me.tbf)?;
Ok(())
}
}
}
pub struct SharedRateLimiter {
shmem: SharedMemory<SharedRateLimiterData>
}
impl SharedRateLimiter {
pub fn mmap_shmem(name: &str, rate: u64, burst: u64) -> Result<Self, Error> {
let mut path = PathBuf::from(BASE_PATH);
let user = pbs_config::backup_user()?;
let dir_opts = CreateOptions::new()
.perm(Mode::from_bits_truncate(0o770))
.owner(user.uid)
.group(user.gid);
create_path(
&path,
Some(dir_opts.clone()),
Some(dir_opts))?;
path.push(name);
let file_opts = CreateOptions::new()
.perm(Mode::from_bits_truncate(0o660))
.owner(user.uid)
.group(user.gid);
let shmem: SharedMemory<SharedRateLimiterData> =
SharedMemory::open(&path, file_opts)?;
shmem.data().tbf.lock().0.update_rate(rate, burst);
Ok(Self { shmem })
}
}
impl ShareableRateLimit for SharedRateLimiter {
fn update_rate(&self, rate: u64, bucket_size: u64) {
self.shmem.data().tbf.lock().0
.update_rate(rate, bucket_size);
}
fn average_rate(&self, current_time: Instant) -> f64 {
self.shmem.data().tbf.lock().0
.average_rate(current_time)
}
fn register_traffic(&self, current_time: Instant, data_len: u64) -> Duration {
self.shmem.data().tbf.lock().0
.register_traffic(current_time, data_len)
}
}