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//! Python bindings for hittekaart.
//!
//! This module provides simple-to-use bindings for hittekaart generation from Python scripts.
use hittekaart::gpx::{self, Compression, Coordinates};
use hittekaart::renderer::{self, Renderer};
use pyo3::create_exception;
use pyo3::exceptions::PyTypeError;
use pyo3::prelude::*;
use std::error::Error;
use std::ffi::OsStr;
use std::fmt::Write as _;
use std::os::unix::ffi::OsStrExt as _;
use std::path::PathBuf;
create_exception!(hittekaart_py, HitteError, pyo3::exceptions::PyException);
/// Converts an error to a Python error.
///
/// This basically maps everything to [`HitteError`] and provides a stringified error explanation.
///
/// This recursively uses `::source()` to walk the chain.
fn err_to_py(mut error: &dyn Error) -> PyErr {
let mut text = error.to_string();
loop {
match error.source() {
None => break,
Some(e) => error = e,
}
write!(&mut text, "\ncaused by: {error}").unwrap();
}
HitteError::new_err(text)
}
/// Python representation of a track.
#[pyclass]
#[derive(Debug, Clone)]
struct Track {
inner: Vec<Coordinates>,
}
#[pymethods]
impl Track {
/// Load a track from a file.
///
/// Compression - if given - should be one of the strings "gzip" or "brotli".
#[staticmethod]
fn from_file(path: &[u8], compression: Option<&str>) -> PyResult<Track> {
let compression = match compression {
None | Some("") => Compression::None,
Some("gzip") => Compression::Gzip,
Some("brotli") => Compression::Brotli,
Some(x) => return Err(HitteError::new_err(format!("invalid compression: {x}"))),
};
let track = gpx::extract_from_file(OsStr::from_bytes(path), compression)
.map_err(|e| err_to_py(&e))?;
Ok(Track { inner: track })
}
/// Load a track from the given coordinates.
#[staticmethod]
fn from_coordinates(coordinates: Vec<(f64, f64)>) -> Track {
Track {
inner: coordinates
.iter()
.map(|(lon, lat)| Coordinates::new(*lon, *lat))
.collect(),
}
}
}
impl Track {
fn coordinates(&self) -> Vec<(f64, f64)> {
self.inner
.iter()
.map(|c| (c.longitude, c.latitude))
.collect()
}
}
#[derive(Debug, Clone, PartialEq, Eq)]
enum StorageType {
Folder(PathBuf),
Sqlite(PathBuf),
}
/// Python representation of a storage target.
#[pyclass]
#[derive(Debug, Clone, PartialEq, Eq)]
struct Storage(StorageType);
#[pymethods]
impl Storage {
/// Output to the given folder.
#[staticmethod]
#[pyo3(name = "Folder")]
fn folder(path: &[u8]) -> Self {
let path = OsStr::from_bytes(path);
Storage(StorageType::Folder(path.into()))
}
/// Output to the given sqlite file.
#[staticmethod]
#[pyo3(name = "Sqlite")]
fn sqlite(path: &[u8]) -> Self {
let path = OsStr::from_bytes(path);
Storage(StorageType::Sqlite(path.into()))
}
}
impl Storage {
fn open(&self) -> PyResult<Box<dyn hittekaart::storage::Storage>> {
match self.0 {
StorageType::Folder(ref path) => {
let storage = hittekaart::storage::Folder::new(path.clone());
Ok(Box::new(storage))
}
StorageType::Sqlite(ref path) => {
let storage = hittekaart::storage::Sqlite::connect(path.clone())
.map_err(|e| err_to_py(&e))?;
Ok(Box::new(storage))
}
}
}
}
/// Python representation of a heatmap renderer.
#[pyclass]
struct HeatmapRenderer {
inner: renderer::heatmap::Renderer,
}
#[pymethods]
impl HeatmapRenderer {
#[new]
fn new() -> HeatmapRenderer {
HeatmapRenderer {
inner: renderer::heatmap::Renderer,
}
}
}
/// Generate the heatmap.
///
/// * `items` is an iterable of [`Track`]s
/// * `renderer` should be a renderer (like [`HeatmapRenderer`])
/// * `storage` is the [`Storage`] output
#[pyfunction]
fn generate(
items: &Bound<'_, PyAny>,
renderer: &Bound<'_, PyAny>,
storage: &Bound<'_, Storage>,
) -> PyResult<()> {
let mut tracks = vec![];
for item in items.try_iter()? {
let item = item?;
tracks.push(item.extract::<Track>()?.inner);
}
if let Ok(r) = renderer.downcast::<HeatmapRenderer>() {
do_generate(tracks, &r.borrow().inner, &mut *storage.borrow().open()?)
} else {
Err(PyTypeError::new_err("Expected a HeatmapRenderer"))
}
}
fn do_generate<R: Renderer>(
tracks: Vec<Vec<Coordinates>>,
renderer: &R,
storage: &mut dyn hittekaart::storage::Storage,
) -> PyResult<()> {
storage.prepare().map_err(|e| err_to_py(&e))?;
for zoom in 0..=19 {
let counter =
renderer::prepare(renderer, zoom, &tracks, || Ok(())).map_err(|e| err_to_py(&e))?;
storage.prepare_zoom(zoom).map_err(|e| err_to_py(&e))?;
renderer::colorize(renderer, counter, |rendered_tile| {
storage.store(zoom, rendered_tile.x, rendered_tile.y, &rendered_tile.data)?;
Ok(())
})
.map_err(|e| err_to_py(&e))?;
}
storage.finish().map_err(|e| err_to_py(&e))?;
Ok(())
}
#[pyfunction]
fn set_threads(threads: usize) -> PyResult<()> {
rayon::ThreadPoolBuilder::new()
.num_threads(threads)
.build_global()
.map_err(|e| err_to_py(&e))
}
/// A Python module implemented in Rust.
#[pymodule]
fn hittekaart_py(py: Python<'_>, m: &Bound<'_, PyModule>) -> PyResult<()> {
m.add_class::<Track>()?;
m.add_class::<HeatmapRenderer>()?;
m.add_class::<Storage>()?;
m.add_function(wrap_pyfunction!(generate, m)?)?;
m.add_function(wrap_pyfunction!(set_threads, m)?)?;
m.add("HitteError", py.get_type::<HitteError>())?;
Ok(())
}
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