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use std::{fmt::Display, time::Duration};
use axum::http::status::StatusCode;
use reqwest::Client;
use serde::{Deserialize, Serialize};
use url::Url;
use crate::status::Sender;
use super::IntoService;
#[derive(Debug, thiserror::Error)]
pub enum Error {
#[error("Request error: {0}")]
Reqwest(#[from] reqwest::Error),
#[error("Bad status code: {0}")]
StatusCode(u16),
}
#[derive(Debug, Clone, Deserialize, Serialize)]
pub struct Http {
pub url: Url,
#[serde(default)]
pub method: Method,
#[serde(default, with = "status_code")]
pub status_code: StatusCode,
#[serde(skip, default)]
pub client: Option<reqwest::Client>,
#[serde(default = "super::default_interval")]
pub interval: Duration,
}
impl Http {
async fn check(&self) -> Result<(), Error> {
let client = match self.client.as_ref() {
Some(client) => client,
None => &Client::new(),
};
let req = client
.request(self.method.into(), self.url.clone())
.build()?;
let status_code = client.execute(req).await?.status().as_u16();
(status_code == self.status_code)
.then_some(())
.ok_or_else(|| Error::StatusCode(status_code))
}
}
impl IntoService for Http {
async fn into_service(self, tx: Sender) {
let mut interval = tokio::time::interval(self.interval);
loop {
interval.tick().await;
let res = self.check().await;
tx.send_if_modified(|s| s.update(res.into()));
}
}
}
#[derive(Debug, Clone, Copy, Default, Deserialize, Serialize)]
pub enum Method {
#[serde(alias = "get", alias = "GET")]
#[default]
Get,
#[serde(alias = "post", alias = "POST")]
Post,
}
impl From<Method> for reqwest::Method {
fn from(value: Method) -> Self {
match value {
Method::Get => reqwest::Method::GET,
Method::Post => reqwest::Method::POST,
}
}
}
impl Display for Method {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
Method::Get => write!(f, "GET"),
Method::Post => write!(f, "POST"),
}
}
}
pub mod status_code {
use axum::http::StatusCode;
use serde::{
de::{self, Unexpected, Visitor},
Deserializer, Serializer,
};
use std::fmt;
/// Implementation detail. Use derive annotations instead.
#[inline]
pub fn serialize<S: Serializer>(status: &StatusCode, ser: S) -> Result<S::Ok, S::Error> {
ser.serialize_u16(status.as_u16())
}
pub(crate) struct StatusVisitor;
impl StatusVisitor {
#[inline(never)]
fn make<E: de::Error>(&self, val: u64) -> Result<StatusCode, E> {
if (100..1000).contains(&val) {
if let Ok(s) = StatusCode::from_u16(val as u16) {
return Ok(s);
}
}
Err(de::Error::invalid_value(Unexpected::Unsigned(val), self))
}
}
impl<'de> Visitor<'de> for StatusVisitor {
type Value = StatusCode;
#[inline]
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("status code")
}
#[inline]
fn visit_some<D: Deserializer<'de>>(
self,
deserializer: D,
) -> Result<Self::Value, D::Error> {
deserializer.deserialize_u16(self)
}
#[inline]
fn visit_i64<E: de::Error>(self, val: i64) -> Result<Self::Value, E> {
self.make(val as _)
}
#[inline]
fn visit_u64<E: de::Error>(self, val: u64) -> Result<Self::Value, E> {
self.make(val)
}
}
/// Implementation detail.
#[inline]
pub fn deserialize<'de, D>(de: D) -> Result<StatusCode, D::Error>
where
D: Deserializer<'de>,
{
de.deserialize_u16(StatusVisitor)
}
}
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