forked from paul/sinoptik
65 lines
1.9 KiB
Rust
65 lines
1.9 KiB
Rust
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//! The Luchtmeetnet open data provider.
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//!
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//! For more information about Luchtmeetnet, see: <https://www.luchtmeetnet.nl/contact>.
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use chrono::serde::ts_seconds;
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use chrono::{DateTime, Utc};
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use rocket::serde::{Deserialize, Serialize};
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use crate::Metric;
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/// The base URL for the Luchtmeetnet API.
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const LUCHTMEETNET_BASE_URL: &str = "https://api.luchtmeetnet.nl/open_api/concentrations";
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/// The Luchtmeetnet API data container.
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///
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/// This is only used temporarily during deserialization.
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#[derive(Debug, Deserialize)]
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#[serde(crate = "rocket::serde")]
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struct Container {
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data: Vec<Item>,
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}
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/// The Luchtmeetnet API data item.
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#[derive(Debug, Deserialize, Serialize)]
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#[serde(crate = "rocket::serde")]
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pub(crate) struct Item {
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/// The time for when the value is forecast.
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#[serde(
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rename(deserialize = "timestamp_measured"),
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serialize_with = "ts_seconds::serialize"
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)]
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time: DateTime<Utc>,
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/// The forecasted value.
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///
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/// The unit depends on the selected [metric](Metric).
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value: f32,
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}
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/// Retrieves the Luchtmeetnet forecasted items for the provided position and metric.
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///
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/// Returns [`None`] if retrieval or deserialization fails, or if the metric is not supported by
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/// this provider.
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pub(crate) async fn get(lat: f64, lon: f64, metric: Metric) -> Option<Vec<Item>> {
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let formula = match metric {
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Metric::AQI => "lki",
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Metric::NO2 => "no2",
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Metric::O3 => "o3",
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Metric::PM10 => "pm10",
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_ => return None, // Unsupported metric
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};
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let url = format!(
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"{LUCHTMEETNET_BASE_URL}?formula={formula}&latitude={:.05}&longitude={:.05}",
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lat, lon
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);
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println!("▶️ Retrieving Luchtmeetnet data from {url}");
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let response = reqwest::get(&url).await.ok()?;
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let root: Container = match response.error_for_status() {
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Ok(res) => res.json().await.ok()?,
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Err(_err) => return None,
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};
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Some(root.data)
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}
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