618 lines
20 KiB
Rust
618 lines
20 KiB
Rust
//! Maps retrieval and caching.
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//!
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//! This module provides a task that keeps maps up-to-date using a maps-specific refresh interval.
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//! It stores all the maps as [`DynamicImage`]s in memory.
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use std::collections::HashMap;
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use std::f64::consts::PI;
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use std::sync::{Arc, Mutex};
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use chrono::serde::ts_seconds;
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use chrono::{DateTime, Duration, NaiveDateTime, Utc};
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use image::{
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DynamicImage, GenericImage, GenericImageView, ImageError, ImageFormat, Pixel, Rgb, Rgba,
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};
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use reqwest::Url;
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use rocket::serde::Serialize;
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use rocket::tokio;
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use rocket::tokio::time::sleep;
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use crate::forecast::Metric;
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use crate::position::Position;
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/// The possible maps errors that can occur.
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#[derive(Debug, thiserror::Error)]
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pub(crate) enum Error {
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/// A timestamp parse error occurred.
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#[error("Timestamp parse error: {0}")]
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ChronoParse(#[from] chrono::ParseError),
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/// A HTTP request error occurred.
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#[error("HTTP request error: {0}")]
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HttpRequest(#[from] reqwest::Error),
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/// Failed to represent HTTP header as a string.
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#[error("Failed to represent HTTP header as a string")]
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HttpHeaderToStr(#[from] reqwest::header::ToStrError),
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/// An image error occurred.
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#[error("Image error: {0}")]
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Image(#[from] ImageError),
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/// Encountered an invalid image file path.
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#[error("Invalid image file path: {0}")]
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InvalidImagePath(String),
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/// Failed to join a task.
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#[error("Failed to join a task: {0}")]
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Join(#[from] rocket::tokio::task::JoinError),
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/// Found no known (map key) colors in samples.
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#[error("Found not known colors in samples")]
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NoKnownColorsInSamples,
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/// No maps found (yet).
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#[error("No maps found (yet)")]
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NoMapsYet,
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/// Got out of bound coordinates for a map.
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#[error("Got out of bound coordinates for a map: ({0}, {1})")]
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OutOfBoundCoords(u32, u32),
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/// Got out of bound offset for a map.
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#[error("Got out of bound offset for a map: {0}")]
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OutOfBoundOffset(u32),
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}
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/// Result type that defaults to [`Error`] as the default error type.
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pub(crate) type Result<T, E = Error> = std::result::Result<T, E>;
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/// A handle to access the in-memory cached maps.
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pub(crate) type MapsHandle = Arc<Mutex<Maps>>;
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/// A histogram mapping map key colors to occurences/counts.
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type MapKeyHistogram = HashMap<Rgb<u8>, u32>;
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/// The Buienradar map key used for determining the score of a coordinate by mapping its color.
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///
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/// Note that the actual score starts from 1, not 0 as per this array.
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#[rustfmt::skip]
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const MAP_KEY: [[u8; 3]; 10] = [
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[0x49, 0xDA, 0x21],
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[0x30, 0xD2, 0x00],
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[0xFF, 0xF8, 0x8B],
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[0xFF, 0xF6, 0x42],
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[0xFD, 0xBB, 0x31],
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[0xFD, 0x8E, 0x24],
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[0xFC, 0x10, 0x3E],
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[0x97, 0x0A, 0x33],
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[0xA6, 0x6D, 0xBC],
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[0xB3, 0x30, 0xA1],
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];
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/// The Buienradar map sample size.
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///
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/// Determiess the number of pixels in width/height that is samples around the sampling coordinate.
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const MAP_SAMPLE_SIZE: [u32; 2] = [11, 11];
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/// The interval between map refreshes (in seconds).
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const REFRESH_INTERVAL: tokio::time::Duration = tokio::time::Duration::from_secs(60);
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/// The base URL for retrieving the pollen maps from Buienradar.
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const POLLEN_BASE_URL: &str =
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"https://image.buienradar.nl/2.0/image/sprite/WeatherMapPollenRadarHourlyNL\
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?width=820&height=988&extension=png&renderBackground=False&renderBranding=False\
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&renderText=False&history=0&forecast=24&skip=0";
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/// The interval for retrieving pollen maps.
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///
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/// The endpoint provides a map for every hour, 24 in total.
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const POLLEN_INTERVAL: i64 = 3_600;
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/// The number of pollen maps retained.
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const POLLEN_MAP_COUNT: u32 = 24;
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/// The number of seconds each pollen map is for.
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const POLLEN_MAP_INTERVAL: i64 = 3_600;
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/// The position reference points for the pollen map.
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///
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/// Maps the gecoded positions of two reference points as follows:
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/// * Latitude and longitude of Vlissingen to its y- and x-position
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/// * Latitude of Lauwersoog to its y-position and longitude of Enschede to its x-position
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const POLLEN_MAP_REF_POINTS: [(Position, (u32, u32)); 2] = [
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(Position::new(51.44, 3.57), (745, 84)), // Vlissingen
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(Position::new(53.40, 6.90), (111, 694)), // Lauwersoog (lat/y) and Enschede (lon/x)
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];
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/// The base URL for retrieving the UV index maps from Buienradar.
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const UVI_BASE_URL: &str = "https://image.buienradar.nl/2.0/image/sprite/WeatherMapUVIndexNL\
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?width=820&height=988&extension=png&&renderBackground=False&renderBranding=False\
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&renderText=False&history=0&forecast=5&skip=0";
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/// The interval for retrieving UV index maps.
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///
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/// The endpoint provides a map for every day, 5 in total.
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const UVI_INTERVAL: i64 = 24 * 3_600;
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/// The number of UV index maps retained.
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const UVI_MAP_COUNT: u32 = 5;
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/// The number of seconds each UV index map is for.
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const UVI_MAP_INTERVAL: i64 = 24 * 3_600;
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/// The position reference points for the UV index map.
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const UVI_MAP_REF_POINTS: [(Position, (u32, u32)); 2] = POLLEN_MAP_REF_POINTS;
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/// The `MapsRefresh` trait is used to reduce the time a lock needs to be held when updating maps.
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///
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/// When refreshing maps, the lock only needs to be held when checking whether a refresh is
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/// necessary and when the new maps have been retrieved and can be updated.
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trait MapsRefresh {
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/// Determines whether the pollen maps need to be refreshed.
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fn needs_pollen_refresh(&self) -> bool;
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/// Determines whether the UV index maps need to be refreshed.
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fn needs_uvi_refresh(&self) -> bool;
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/// Determines whether the pollen maps are stale.
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fn is_pollen_stale(&self) -> bool;
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/// Determines whether the UV index maps are stale.
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fn is_uvi_stale(&self) -> bool;
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/// Updates the pollen maps.
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fn set_pollen(&self, result: Result<RetrievedMaps>);
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/// Updates the UV index maps.
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fn set_uvi(&self, result: Result<RetrievedMaps>);
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}
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/// Container type for all in-memory cached maps.
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#[derive(Debug, Default)]
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pub(crate) struct Maps {
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/// The pollen maps (from Buienradar).
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pub(crate) pollen: Option<RetrievedMaps>,
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/// The UV index maps (from Buienradar).
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pub(crate) uvi: Option<RetrievedMaps>,
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}
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impl Maps {
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/// Creates a new maps cache.
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///
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/// It contains an [`DynamicImage`] per maps type, if downloaded, and the timestamp of the last
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/// update.
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pub(crate) fn new() -> Self {
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Self {
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pollen: None,
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uvi: None,
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}
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}
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/// Returns a current pollen map that marks the provided position.
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pub(crate) fn pollen_mark(&self, position: Position) -> Result<DynamicImage> {
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let maps = self.pollen.as_ref().ok_or(Error::NoMapsYet)?;
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let image = &maps.image;
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let stamp = maps.timestamp_base;
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let marked_image = map_at(
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image,
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stamp,
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POLLEN_MAP_INTERVAL,
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POLLEN_MAP_COUNT,
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Utc::now(),
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)?;
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let coords = project(&marked_image, POLLEN_MAP_REF_POINTS, position)?;
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Ok(mark(marked_image, coords))
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}
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/// Samples the pollen maps for the given position.
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pub(crate) fn pollen_samples(&self, position: Position) -> Result<Vec<Sample>> {
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let maps = self.pollen.as_ref().ok_or(Error::NoMapsYet)?;
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let image = &maps.image;
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let map = image.view(0, 0, image.width() / UVI_MAP_COUNT, image.height());
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let coords = project(&*map, POLLEN_MAP_REF_POINTS, position)?;
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let stamp = maps.timestamp_base;
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sample(image, stamp, POLLEN_MAP_INTERVAL, POLLEN_MAP_COUNT, coords)
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}
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/// Returns a current UV index map that marks the provided position.
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pub(crate) fn uvi_mark(&self, position: Position) -> Result<DynamicImage> {
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let maps = self.uvi.as_ref().ok_or(Error::NoMapsYet)?;
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let image = &maps.image;
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let stamp = maps.timestamp_base;
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let marked_image = map_at(image, stamp, UVI_MAP_INTERVAL, UVI_MAP_COUNT, Utc::now())?;
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let coords = project(&marked_image, POLLEN_MAP_REF_POINTS, position)?;
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Ok(mark(marked_image, coords))
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}
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/// Samples the UV index maps for the given position.
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pub(crate) fn uvi_samples(&self, position: Position) -> Result<Vec<Sample>> {
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let maps = self.uvi.as_ref().ok_or(Error::NoMapsYet)?;
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let image = &maps.image;
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let map = image.view(0, 0, image.width() / UVI_MAP_COUNT, image.height());
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let coords = project(&*map, UVI_MAP_REF_POINTS, position)?;
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let stamp = maps.timestamp_base;
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sample(image, stamp, UVI_MAP_INTERVAL, UVI_MAP_COUNT, coords)
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}
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}
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impl MapsRefresh for MapsHandle {
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fn is_pollen_stale(&self) -> bool {
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let maps = self.lock().expect("Maps handle mutex was poisoned");
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match &maps.pollen {
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Some(pollen_maps) => {
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Utc::now().signed_duration_since(pollen_maps.mtime)
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> Duration::seconds(POLLEN_MAP_COUNT as i64 * POLLEN_MAP_INTERVAL)
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}
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None => false,
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}
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}
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fn is_uvi_stale(&self) -> bool {
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let maps = self.lock().expect("Maps handle mutex was poisoned");
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match &maps.uvi {
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Some(uvi_maps) => {
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Utc::now().signed_duration_since(uvi_maps.mtime)
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> Duration::seconds(UVI_MAP_COUNT as i64 * UVI_MAP_INTERVAL)
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}
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None => false,
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}
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}
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fn needs_pollen_refresh(&self) -> bool {
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let maps = self.lock().expect("Maps handle mutex was poisoned");
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match &maps.pollen {
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Some(pollen_maps) => {
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Utc::now()
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.signed_duration_since(pollen_maps.mtime)
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.num_seconds()
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> POLLEN_INTERVAL
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}
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None => true,
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}
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}
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fn needs_uvi_refresh(&self) -> bool {
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let maps = self.lock().expect("Maps handle mutex was poisoned");
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match &maps.uvi {
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Some(uvi_maps) => {
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Utc::now()
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.signed_duration_since(uvi_maps.mtime)
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.num_seconds()
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> UVI_INTERVAL
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}
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None => true,
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}
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}
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fn set_pollen(&self, retrieved_maps: Result<RetrievedMaps>) {
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if retrieved_maps.is_ok() || self.is_pollen_stale() {
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let mut maps = self.lock().expect("Maps handle mutex was poisoned");
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maps.pollen = retrieved_maps.ok();
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}
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}
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fn set_uvi(&self, retrieved_maps: Result<RetrievedMaps>) {
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if retrieved_maps.is_ok() || self.is_uvi_stale() {
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let mut maps = self.lock().expect("Maps handle mutex was poisoned");
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maps.uvi = retrieved_maps.ok();
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}
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}
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}
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/// A Buienradar map sample.
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///
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/// This represents a value at a given time.
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#[derive(Clone, Debug, PartialEq, Serialize)]
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#[serde(crate = "rocket::serde")]
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pub(crate) struct Sample {
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/// The time(stamp) of the forecast.
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#[serde(serialize_with = "ts_seconds::serialize")]
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pub(crate) time: DateTime<Utc>,
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/// The forecasted score.
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///
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/// A value in the range `1..=10`.
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#[serde(rename(serialize = "value"))]
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pub(crate) score: u8,
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}
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impl Sample {
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#[cfg(test)]
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pub(crate) fn new(time: DateTime<Utc>, score: u8) -> Self {
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Self { time, score }
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}
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}
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/// Builds a scoring histogram for the map key.
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fn map_key_histogram() -> MapKeyHistogram {
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MAP_KEY
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.into_iter()
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.fold(HashMap::new(), |mut hm, channels| {
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hm.insert(Rgb::from(channels), 0);
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hm
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})
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}
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/// Samples the provided maps at the given (map-relative) coordinates and starting timestamp.
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/// It assumes the provided coordinates are within bounds of at least one map.
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/// The interval is the number of seconds the timestamp is bumped for each map.
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fn sample<I: GenericImageView<Pixel = Rgba<u8>>>(
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image: &I,
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stamp: DateTime<Utc>,
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interval: i64,
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count: u32,
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coords: (u32, u32),
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) -> Result<Vec<Sample>> {
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let (x, y) = coords;
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let width = image.width() / count;
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let height = image.height();
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if x > width || y > height {
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return Err(Error::OutOfBoundCoords(x, y));
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}
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let max_sample_width = (width - x).min(MAP_SAMPLE_SIZE[0]);
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let max_sample_height = (height - y).min(MAP_SAMPLE_SIZE[1]);
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let mut samples = Vec::with_capacity(count as usize);
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let mut time = stamp;
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let mut offset = 0;
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while offset < image.width() {
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let map = image.view(
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x.saturating_sub(MAP_SAMPLE_SIZE[0] / 2) + offset,
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y.saturating_sub(MAP_SAMPLE_SIZE[1] / 2),
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max_sample_width,
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max_sample_height,
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);
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let histogram = map
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.pixels()
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.fold(map_key_histogram(), |mut h, (_px, _py, color)| {
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h.entry(color.to_rgb()).and_modify(|count| *count += 1);
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h
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});
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let (max_color, &count) = histogram
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.iter()
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.max_by_key(|(_color, count)| *count)
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.expect("Map key is never empty");
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if count == 0 {
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return Err(Error::NoKnownColorsInSamples);
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}
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let score = MAP_KEY
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.iter()
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.position(|&color| &Rgb::from(color) == max_color)
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.map(|score| score + 1) // Scores go from 1..=10, not 0..=9!
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.expect("Maximum color is always a map key color") as u8;
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samples.push(Sample { time, score });
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time = time + chrono::Duration::seconds(interval as i64);
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offset += width;
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}
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Ok(samples)
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}
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/// A retrieved image with some metadata.
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#[derive(Debug)]
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pub(crate) struct RetrievedMaps {
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/// The image data.
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pub(crate) image: DynamicImage,
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/// The date/time the image was last modified.
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pub(crate) mtime: DateTime<Utc>,
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/// The starting date/time the image corresponds with.
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pub(crate) timestamp_base: DateTime<Utc>,
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}
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impl RetrievedMaps {
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#[cfg(test)]
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pub(crate) fn new(image: DynamicImage) -> Self {
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let mtime = Utc::now();
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let timestamp_base = Utc::now();
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Self {
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image,
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mtime,
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timestamp_base,
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}
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}
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}
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/// Retrieves an image from the provided URL.
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async fn retrieve_image(url: Url) -> Result<RetrievedMaps> {
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let response = reqwest::get(url).await?;
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let mtime = match response.headers().get(reqwest::header::LAST_MODIFIED) {
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Some(mtime_header) => {
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let mtime_headr_str = mtime_header.to_str()?;
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DateTime::from(DateTime::parse_from_rfc2822(mtime_headr_str)?)
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}
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None => Utc::now(),
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};
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let timestamp_base = {
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let path = response.url().path();
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let (_, filename) = path
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.rsplit_once('/')
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.ok_or_else(|| Error::InvalidImagePath(path.to_owned()))?;
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let (timestamp_str, _) = filename
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.split_once("__")
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.ok_or_else(|| Error::InvalidImagePath(path.to_owned()))?;
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let timestamp = NaiveDateTime::parse_from_str(timestamp_str, "%Y%m%d%H%M")?;
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DateTime::<Utc>::from_utc(timestamp, Utc)
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};
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let bytes = response.bytes().await?;
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tokio::task::spawn_blocking(move || {
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image::load_from_memory_with_format(&bytes, ImageFormat::Png)
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.map(|image| RetrievedMaps {
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image,
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mtime,
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timestamp_base,
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})
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.map_err(Error::from)
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})
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.await?
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}
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/// Retrieves the pollen maps from Buienradar.
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///
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/// See [`POLLEN_BASE_URL`] for the base URL and [`retrieve_image`] for the retrieval function.
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async fn retrieve_pollen_maps() -> Result<RetrievedMaps> {
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let timestamp = format!("{}", chrono::Local::now().format("%y%m%d%H%M"));
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let mut url = Url::parse(POLLEN_BASE_URL).unwrap();
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url.query_pairs_mut().append_pair("timestamp", ×tamp);
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println!("🗺️ Refreshing pollen maps from: {}", url);
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retrieve_image(url).await
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}
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/// Retrieves the UV index maps from Buienradar.
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///
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/// See [`UVI_BASE_URL`] for the base URL and [`retrieve_image`] for the retrieval function.
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async fn retrieve_uvi_maps() -> Result<RetrievedMaps> {
|
|
let timestamp = format!("{}", chrono::Local::now().format("%y%m%d%H%M"));
|
|
let mut url = Url::parse(UVI_BASE_URL).unwrap();
|
|
url.query_pairs_mut().append_pair("timestamp", ×tamp);
|
|
|
|
println!("🗺️ Refreshing UV index maps from: {}", url);
|
|
retrieve_image(url).await
|
|
}
|
|
|
|
/// Returns the map for the given instant.
|
|
fn map_at(
|
|
image: &DynamicImage,
|
|
stamp: DateTime<Utc>,
|
|
interval: i64,
|
|
count: u32,
|
|
instant: DateTime<Utc>,
|
|
) -> Result<DynamicImage> {
|
|
let duration = instant.signed_duration_since(stamp);
|
|
let offset = (duration.num_seconds() / interval) as u32;
|
|
// Check if out of bounds.
|
|
if offset >= count {
|
|
return Err(Error::OutOfBoundOffset(offset));
|
|
}
|
|
let width = image.width() / count;
|
|
|
|
Ok(image.crop_imm(offset * width, 0, width, image.height()))
|
|
}
|
|
|
|
/// Marks the provided coordinates on the map using a horizontal and vertical line.
|
|
fn mark(mut image: DynamicImage, coords: (u32, u32)) -> DynamicImage {
|
|
let (x, y) = coords;
|
|
|
|
for py in 0..image.height() {
|
|
image.put_pixel(x, py, Rgba::from([0x00, 0x00, 0x00, 0x70]));
|
|
}
|
|
for px in 0..image.width() {
|
|
image.put_pixel(px, y, Rgba::from([0x00, 0x00, 0x00, 0x70]));
|
|
}
|
|
|
|
image
|
|
}
|
|
|
|
/// Projects the provided geocoded position to a coordinate on a map.
|
|
///
|
|
/// This uses two reference points and a Mercator projection on the y-coordinates of those points
|
|
/// to calculate how the map scales with respect to the provided position.
|
|
fn project<I: GenericImageView>(
|
|
image: &I,
|
|
ref_points: [(Position, (u32, u32)); 2],
|
|
pos: Position,
|
|
) -> Result<(u32, u32)> {
|
|
// Get the data from the reference points.
|
|
let (ref1, (ref1_y, ref1_x)) = ref_points[0];
|
|
let (ref2, (ref2_y, ref2_x)) = ref_points[1];
|
|
|
|
// For the x-coordinate, use a linear scale.
|
|
let scale_x = ((ref2_x - ref1_x) as f64) / (ref2.lon_as_rad() - ref1.lon_as_rad());
|
|
let x = ((pos.lon_as_rad() - ref1.lon_as_rad()) * scale_x + ref1_x as f64).round() as u32;
|
|
|
|
// For the y-coordinate, use a Mercator-projected scale.
|
|
let mercator_y = |lat: f64| (lat / 2.0 + PI / 4.0).tan().ln();
|
|
let ref1_merc_y = mercator_y(ref1.lat_as_rad());
|
|
let ref2_merc_y = mercator_y(ref2.lat_as_rad());
|
|
let scale_y = ((ref1_y - ref2_y) as f64) / (ref2_merc_y - ref1_merc_y);
|
|
let y = ((ref2_merc_y - mercator_y(pos.lat_as_rad())) * scale_y + ref2_y as f64).round() as u32;
|
|
|
|
if image.in_bounds(x, y) {
|
|
Ok((x, y))
|
|
} else {
|
|
Err(Error::OutOfBoundCoords(x, y))
|
|
}
|
|
}
|
|
|
|
/// Returns the data of a map with a crosshair drawn on it for the given position.
|
|
///
|
|
/// The map that is used is determined by the provided metric.
|
|
pub(crate) async fn mark_map(
|
|
position: Position,
|
|
metric: Metric,
|
|
maps_handle: &MapsHandle,
|
|
) -> crate::Result<Vec<u8>> {
|
|
use std::io::Cursor;
|
|
|
|
let maps_handle = Arc::clone(maps_handle);
|
|
tokio::task::spawn_blocking(move || {
|
|
let maps = maps_handle.lock().expect("Maps handle lock was poisoned");
|
|
let image = match metric {
|
|
Metric::PAQI => maps.pollen_mark(position),
|
|
Metric::Pollen => maps.pollen_mark(position),
|
|
Metric::UVI => maps.uvi_mark(position),
|
|
_ => return Err(crate::Error::UnsupportedMetric(metric)),
|
|
}?;
|
|
drop(maps);
|
|
|
|
// Encode the image as PNG image data.
|
|
let mut image_data = Cursor::new(Vec::new());
|
|
match image.write_to(
|
|
&mut image_data,
|
|
image::ImageOutputFormat::from(image::ImageFormat::Png),
|
|
) {
|
|
Ok(()) => Ok(image_data.into_inner()),
|
|
Err(err) => Err(crate::Error::from(Error::from(err))),
|
|
}
|
|
})
|
|
.await
|
|
.map_err(Error::from)?
|
|
}
|
|
|
|
/// Runs a loop that keeps refreshing the maps when necessary.
|
|
///
|
|
/// Use [`MapsRefresh`] trait methods on `maps_handle` to check whether each maps type needs to be
|
|
/// refreshed and uses its retrieval function to update it if necessary.
|
|
pub(crate) async fn run(maps_handle: MapsHandle) {
|
|
loop {
|
|
println!("🕔 Refreshing the maps (if necessary)...");
|
|
|
|
if maps_handle.needs_pollen_refresh() {
|
|
let retrieved_maps = retrieve_pollen_maps().await;
|
|
if let Err(e) = retrieved_maps.as_ref() {
|
|
eprintln!("💥 Encountered error during pollen maps refresh: {}", e);
|
|
}
|
|
maps_handle.set_pollen(retrieved_maps);
|
|
}
|
|
|
|
if maps_handle.needs_uvi_refresh() {
|
|
let retrieved_maps = retrieve_uvi_maps().await;
|
|
if let Err(e) = retrieved_maps.as_ref() {
|
|
eprintln!("💥 Encountered error during UVI maps refresh: {}", e);
|
|
}
|
|
maps_handle.set_uvi(retrieved_maps);
|
|
}
|
|
|
|
sleep(REFRESH_INTERVAL).await;
|
|
}
|
|
}
|