112 lines
4.0 KiB
Rust
112 lines
4.0 KiB
Rust
//! Systemd go-sbot process statistics retrieval functions and associated data types.
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use std::{process::Command, str};
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#[cfg(feature = "miniserde_support")]
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use miniserde::{Deserialize, Serialize};
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#[cfg(feature = "serde_support")]
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use serde::{Deserialize, Serialize};
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use crate::StatsError;
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/// go-sbot process statistics.
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#[derive(Debug)]
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#[cfg_attr(feature = "miniserde_support", derive(Serialize, Deserialize))]
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#[cfg_attr(feature = "serde_support", derive(Serialize, Deserialize))]
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pub struct SbotStat {
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/// Current process state.
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pub state: Option<String>,
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/// Current process boot state.
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pub boot_state: Option<String>,
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/// Current process memory usage in bytes.
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pub memory: Option<u32>,
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/// Uptime for the process (if state is `active`).
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pub uptime: Option<String>,
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/// Downtime for the process (if state is `inactive`).
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pub downtime: Option<String>,
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}
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impl SbotStat {
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/// Default builder for `SbotStat`.
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fn default() -> Self {
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Self {
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state: None,
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boot_state: None,
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memory: None,
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uptime: None,
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downtime: None,
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}
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}
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}
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/// Retrieve statistics for the go-sbot systemd process by querying `systemctl`.
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pub fn sbot_stats() -> Result<SbotStat, StatsError> {
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let mut status = SbotStat::default();
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let info_output = Command::new("sudo")
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.arg("systemctl")
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.arg("show")
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.arg("go-sbot.service")
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.arg("--no-page")
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.output()
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.map_err(StatsError::Systemctl)?;
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let service_info = std::str::from_utf8(&info_output.stdout).map_err(StatsError::Utf8String)?;
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for line in service_info.lines() {
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if line.starts_with("ActiveState=") {
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if let Some(state) = line.strip_prefix("ActiveState=") {
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status.state = Some(state.to_string())
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}
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} else if line.starts_with("MemoryCurrent=") {
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if let Some(memory) = line.strip_prefix("MemoryCurrent=") {
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status.memory = memory.parse().ok()
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}
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}
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}
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let status_output = Command::new("sudo")
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.arg("systemctl")
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.arg("status")
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.arg("go-sbot.service")
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.output()
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.map_err(StatsError::Systemctl)?;
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let service_status = str::from_utf8(&status_output.stdout).map_err(StatsError::Utf8String)?;
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for line in service_status.lines() {
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// example of the output line we're looking for:
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// `Loaded: loaded (/home/glyph/.config/systemd/user/go-sbot.service; enabled; vendor
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// preset: enabled)`
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if line.contains("Loaded:") {
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let before_boot_state = line.find(';');
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let after_boot_state = line.rfind(';');
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if let (Some(start), Some(end)) = (before_boot_state, after_boot_state) {
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// extract the enabled / disabled from the `Loaded: ...` line
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// using the index of the first ';' + 2 and the last ';'
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status.boot_state = Some(line[start + 2..end].to_string());
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}
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// example of the output line we're looking for here:
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// `Active: active (running) since Mon 2022-01-24 16:22:51 SAST; 4min 14s ago`
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} else if line.contains("Active:") {
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let before_time = line.find(';');
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let after_time = line.find(" ago");
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if let (Some(start), Some(end)) = (before_time, after_time) {
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// extract the uptime / downtime from the `Active: ...` line
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// using the index of ';' + 2 and the index of " ago"
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let time = Some(&line[start + 2..end]);
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// if service is active then the `time` reading is uptime
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if status.state == Some("active".to_string()) {
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status.uptime = time.map(|t| t.to_string())
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// if service is inactive then the `time` reading is downtime
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} else if status.state == Some("inactive".to_string()) {
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status.downtime = time.map(|t| t.to_string())
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}
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}
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}
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}
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Ok(status)
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}
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