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use std::{fmt::Display, process::Command};
use reqwest::blocking::Client;
use serde::Deserialize;
use crate::Error;
#[derive(Debug, Clone, Deserialize)]
pub struct Service {
pub name: String,
#[serde(flatten)]
pub kind: Kind,
#[serde(skip)]
pub state: State,
}
impl Service {
pub fn check(&mut self, client: Client) -> Result<bool, Error> {
self.state = self.kind.get_state(client)?;
Ok(self.state.is_operational())
}
}
#[derive(Debug, Clone, Deserialize)]
#[serde(tag = "type", rename_all = "lowercase")]
pub enum Kind {
Tcp {
address: String,
},
Http {
url: String,
#[serde(default = "Kind::default_method")]
method: String,
#[serde(default = "Kind::default_code")]
status_code: u16,
},
Systemd {
service: String,
},
}
impl Kind {
fn default_method() -> String {
"GET".to_string()
}
fn default_code() -> u16 {
200
}
pub fn get_state(&self, client: Client) -> Result<State, Error> {
let state = match self {
Kind::Tcp { address } => {
if std::net::TcpStream::connect(address).is_ok() {
State::Operational
} else {
State::Down("Unreachable".to_string())
}
}
Kind::Http {
method,
url,
status_code,
} => {
match client
.request(method.parse().map_err(|_| Error::Method)?, url)
.send()?
.status()
{
s if s.as_u16() == *status_code => State::Operational,
s => State::Down(s.to_string()),
}
}
Kind::Systemd { service } => {
let output = Command::new("systemctl")
.arg("is-active")
.arg(service)
.output()?;
if output.status.success() {
State::Operational
} else {
State::Down(String::from_utf8_lossy(&output.stdout).to_string())
}
}
};
Ok(state)
}
}
impl Display for Kind {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
Kind::Tcp { address } => write!(f, "tcp://{address}"),
Kind::Http { method, url, .. } => write!(f, "{method} {url}"),
Kind::Systemd { service } => write!(f, "{service}"),
}
}
}
#[derive(Debug, Clone, Default)]
pub struct Status {
pub info: String,
pub state: State,
}
#[derive(Debug, Clone, Default)]
pub enum State {
#[default]
Unknown,
Operational,
Down(String),
}
impl State {
/// Returns `true` if this is a `Unknown` variant.
pub fn is_unknown(&self) -> bool {
matches!(self, Self::Unknown)
}
/// Returns `true` if this is a `Operational` variant.
pub fn is_operational(&self) -> bool {
matches!(self, Self::Operational)
}
/// Returns `true` if this is a `Down` variant.
pub fn is_down(&self) -> bool {
matches!(self, Self::Down(_))
}
/// Converts the `State` into an `Option` containing `String` description if the `State` was
/// `Down` and `None` otherwise.
pub fn down_value(self) -> Option<String> {
match self {
State::Unknown => None,
State::Operational => None,
State::Down(s) => Some(s),
}
}
pub fn as_level(&self) -> String {
match self {
State::Unknown => "warning",
State::Operational => "ok",
State::Down(_) => "error",
}
.to_string()
}
}
impl Display for State {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
State::Unknown => write!(f, "Unknown"),
State::Operational => write!(f, "Operational"),
State::Down(s) => write!(f, "{s}"),
}
}
}
|
