343 lines
11 KiB
Rust
343 lines
11 KiB
Rust
use std::io::Read;
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use std::path::Path;
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use anyhow::Error;
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use crate::api2::types::{RRDMode, RRDTimeFrameResolution};
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pub const RRD_DATA_ENTRIES: usize = 70;
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// openssl::sha::sha256(b"Proxmox Round Robin Database file v1.0")[0..8];
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pub const PROXMOX_RRD_MAGIC_1_0: [u8; 8] = [206, 46, 26, 212, 172, 158, 5, 186];
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use bitflags::bitflags;
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bitflags!{
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pub struct RRAFlags: u64 {
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// Data Source Types
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const DST_GAUGE = 1;
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const DST_DERIVE = 2;
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const DST_COUNTER = 4;
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const DST_MASK = 255; // first 8 bits
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// Consolidation Functions
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const CF_AVERAGE = 1 << 8;
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const CF_MAX = 2 << 8;
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const CF_MASK = 255 << 8;
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}
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}
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pub enum DST {
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Gauge,
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Derive,
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}
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#[repr(C)]
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struct RRA {
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flags: RRAFlags,
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resolution: u64,
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last_update: f64,
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last_count: u64,
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counter_value: f64, // used for derive/counters
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data: [f64; RRD_DATA_ENTRIES],
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}
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impl RRA {
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fn new(flags: RRAFlags, resolution: u64) -> Self {
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Self {
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flags, resolution,
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last_update: 0.0,
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last_count: 0,
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counter_value: f64::NAN,
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data: [f64::NAN; RRD_DATA_ENTRIES],
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}
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}
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fn delete_old(&mut self, time: f64) {
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let epoch = time as u64;
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let last_update = self.last_update as u64;
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let reso = self.resolution;
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let min_time = epoch - (RRD_DATA_ENTRIES as u64)*reso;
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let min_time = (min_time/reso + 1)*reso;
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let mut t = last_update.saturating_sub((RRD_DATA_ENTRIES as u64)*reso);
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let mut index = ((t/reso) % (RRD_DATA_ENTRIES as u64)) as usize;
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for _ in 0..RRD_DATA_ENTRIES {
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t += reso; index = (index + 1) % RRD_DATA_ENTRIES;
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if t < min_time {
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self.data[index] = f64::NAN;
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} else {
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break;
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}
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}
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}
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fn compute_new_value(&mut self, time: f64, value: f64) {
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let epoch = time as u64;
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let last_update = self.last_update as u64;
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let reso = self.resolution;
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let index = ((epoch/reso) % (RRD_DATA_ENTRIES as u64)) as usize;
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let last_index = ((last_update/reso) % (RRD_DATA_ENTRIES as u64)) as usize;
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if (epoch - (last_update as u64)) > reso || index != last_index {
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self.last_count = 0;
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}
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let last_value = self.data[index];
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if last_value.is_nan() {
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self.last_count = 0;
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}
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let new_count = if self.last_count < u64::MAX {
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self.last_count + 1
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} else {
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u64::MAX // should never happen
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};
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if self.last_count == 0 {
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self.data[index] = value;
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self.last_count = 1;
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} else {
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let new_value = if self.flags.contains(RRAFlags::CF_MAX) {
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if last_value > value { last_value } else { value }
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} else if self.flags.contains(RRAFlags::CF_AVERAGE) {
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(last_value*(self.last_count as f64))/(new_count as f64)
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+ value/(new_count as f64)
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} else {
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eprintln!("rrdb update failed - unknown CF");
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return;
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};
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self.data[index] = new_value;
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self.last_count = new_count;
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}
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self.last_update = time;
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}
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fn update(&mut self, time: f64, mut value: f64) {
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if time <= self.last_update {
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eprintln!("rrdb update failed - time in past ({} < {})", time, self.last_update);
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}
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if value.is_nan() {
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eprintln!("rrdb update failed - new value is NAN");
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return;
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}
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// derive counter value
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if self.flags.intersects(RRAFlags::DST_DERIVE | RRAFlags::DST_COUNTER) {
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let time_diff = time - self.last_update;
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let diff = if self.counter_value.is_nan() {
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0.0
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} else {
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if self.flags.contains(RRAFlags::DST_COUNTER) { // check for overflow
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if value < 0.0 {
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eprintln!("rrdb update failed - got negative value for counter");
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return;
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}
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// Note: We do not try automatic overflow corrections
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if value < self.counter_value { // overflow or counter reset
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self.counter_value = value;
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eprintln!("rrdb update failed - conter overflow/reset detected");
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return;
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} else {
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value - self.counter_value
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}
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} else {
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value - self.counter_value
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}
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};
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self.counter_value = value;
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value = diff/time_diff;
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}
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self.delete_old(time);
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self.compute_new_value(time, value);
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}
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}
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#[repr(C)]
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// Note: Avoid alignment problems by using 8byte types only
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pub struct RRD {
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magic: [u8; 8],
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hour_avg: RRA,
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hour_max: RRA,
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day_avg: RRA,
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day_max: RRA,
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week_avg: RRA,
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week_max: RRA,
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month_avg: RRA,
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month_max: RRA,
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year_avg: RRA,
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year_max: RRA,
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}
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impl RRD {
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pub fn new(dst: DST) -> Self {
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let flags = match dst {
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DST::Gauge => RRAFlags::DST_GAUGE,
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DST::Derive => RRAFlags::DST_DERIVE,
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};
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Self {
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magic: PROXMOX_RRD_MAGIC_1_0,
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hour_avg: RRA::new(
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flags | RRAFlags::CF_AVERAGE,
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RRDTimeFrameResolution::Hour as u64,
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),
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hour_max: RRA::new(
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flags | RRAFlags::CF_MAX,
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RRDTimeFrameResolution::Hour as u64,
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),
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day_avg: RRA::new(
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flags | RRAFlags::CF_AVERAGE,
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RRDTimeFrameResolution::Day as u64,
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),
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day_max: RRA::new(
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flags | RRAFlags::CF_MAX,
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RRDTimeFrameResolution::Day as u64,
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),
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week_avg: RRA::new(
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flags | RRAFlags::CF_AVERAGE,
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RRDTimeFrameResolution::Week as u64,
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),
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week_max: RRA::new(
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flags | RRAFlags::CF_MAX,
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RRDTimeFrameResolution::Week as u64,
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),
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month_avg: RRA::new(
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flags | RRAFlags::CF_AVERAGE,
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RRDTimeFrameResolution::Month as u64,
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),
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month_max: RRA::new(
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flags | RRAFlags::CF_MAX,
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RRDTimeFrameResolution::Month as u64,
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),
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year_avg: RRA::new(
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flags | RRAFlags::CF_AVERAGE,
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RRDTimeFrameResolution::Year as u64,
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),
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year_max: RRA::new(
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flags | RRAFlags::CF_MAX,
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RRDTimeFrameResolution::Year as u64,
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),
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}
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}
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pub fn extract_data(
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&self,
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time: f64,
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timeframe: RRDTimeFrameResolution,
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mode: RRDMode,
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) -> (u64, u64, Vec<Option<f64>>) {
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let epoch = time as u64;
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let reso = timeframe as u64;
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let end = reso*(epoch/reso + 1);
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let start = end - reso*(RRD_DATA_ENTRIES as u64);
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let mut list = Vec::new();
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let raa = match (mode, timeframe) {
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(RRDMode::Average, RRDTimeFrameResolution::Hour) => &self.hour_avg,
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(RRDMode::Max, RRDTimeFrameResolution::Hour) => &self.hour_max,
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(RRDMode::Average, RRDTimeFrameResolution::Day) => &self.day_avg,
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(RRDMode::Max, RRDTimeFrameResolution::Day) => &self.day_max,
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(RRDMode::Average, RRDTimeFrameResolution::Week) => &self.week_avg,
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(RRDMode::Max, RRDTimeFrameResolution::Week) => &self.week_max,
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(RRDMode::Average, RRDTimeFrameResolution::Month) => &self.month_avg,
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(RRDMode::Max, RRDTimeFrameResolution::Month) => &self.month_max,
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(RRDMode::Average, RRDTimeFrameResolution::Year) => &self.year_avg,
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(RRDMode::Max, RRDTimeFrameResolution::Year) => &self.year_max,
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};
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let rrd_end = reso*((raa.last_update as u64)/reso);
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let rrd_start = rrd_end - reso*(RRD_DATA_ENTRIES as u64);
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let mut t = start;
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let mut index = ((t/reso) % (RRD_DATA_ENTRIES as u64)) as usize;
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for _ in 0..RRD_DATA_ENTRIES {
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if t < rrd_start || t > rrd_end {
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list.push(None);
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} else {
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let value = raa.data[index];
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if value.is_nan() {
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list.push(None);
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} else {
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list.push(Some(value));
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}
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}
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t += reso; index = (index + 1) % RRD_DATA_ENTRIES;
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}
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(start, reso, list)
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}
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pub fn from_raw(mut raw: &[u8]) -> Result<Self, std::io::Error> {
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let expected_len = std::mem::size_of::<RRD>();
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if raw.len() != expected_len {
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let msg = format!("wrong data size ({} != {})", raw.len(), expected_len);
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return Err(std::io::Error::new(std::io::ErrorKind::Other, msg));
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}
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let mut rrd: RRD = unsafe { std::mem::zeroed() };
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unsafe {
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let rrd_slice = std::slice::from_raw_parts_mut(&mut rrd as *mut _ as *mut u8, expected_len);
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raw.read_exact(rrd_slice)?;
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}
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if rrd.magic != PROXMOX_RRD_MAGIC_1_0 {
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let msg = "wrong magic number".to_string();
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return Err(std::io::Error::new(std::io::ErrorKind::Other, msg));
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}
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Ok(rrd)
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}
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pub fn load(path: &Path) -> Result<Self, std::io::Error> {
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let raw = std::fs::read(path)?;
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Self::from_raw(&raw)
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}
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pub fn save(&self, filename: &Path) -> Result<(), Error> {
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use proxmox::tools::{fs::replace_file, fs::CreateOptions};
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let rrd_slice = unsafe {
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std::slice::from_raw_parts(self as *const _ as *const u8, std::mem::size_of::<RRD>())
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};
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let backup_user = crate::backup::backup_user()?;
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let mode = nix::sys::stat::Mode::from_bits_truncate(0o0644);
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// set the correct owner/group/permissions while saving file
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// owner(rw) = backup, group(r)= backup
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let options = CreateOptions::new()
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.perm(mode)
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.owner(backup_user.uid)
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.group(backup_user.gid);
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replace_file(filename, rrd_slice, options)?;
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Ok(())
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}
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pub fn update(&mut self, time: f64, value: f64) {
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self.hour_avg.update(time, value);
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self.hour_max.update(time, value);
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self.day_avg.update(time, value);
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self.day_max.update(time, value);
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self.week_avg.update(time, value);
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self.week_max.update(time, value);
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self.month_avg.update(time, value);
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self.month_max.update(time, value);
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self.year_avg.update(time, value);
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self.year_max.update(time, value);
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}
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}
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