feat: add abort signal support

Author: tomerigal

index.mjs

@@ -29,10 +29,12 @@ export default async function geotiff_read_bbox({
   srs: srs_of_bbox,
   use_overview = false,
   target_height,
-  target_width
+  target_width,
+  signal
 }) {
   if (debug_level >= 1) console.log("[geotiff-read-bbox] starting");
 
+  if (signal && signal.aborted) throw new Error("[geotiff-read-bbox] operation aborted");
   if (geotiff === null) throw new Error("[geotiff-read-bbox] geotiff is null");
   if (geotiff === undefined) throw new Error("[geotiff-read-bbox] geotiff is undefined");
 
@@ -202,7 +204,7 @@ export default async function geotiff_read_bbox({
       selected.read_width = read_width;
     }
     if (debug_level >= 2) console.log("[geotiff-read-bbox] reading ", selected.read_window);
-    data = await selected.image.readRasters({ fillValue: fill_value, window: selected.read_window });
+    data = await selected.image.readRasters({ fillValue: fill_value, window: selected.read_window, signal });
   }
 
   const duration_read_rasters = performance.now() - start_read_rasters;

test.mjs

@@ -485,3 +485,25 @@ test("wildfires", async ({ eq }) => {
 
   await server.close();
 });
+
+test("abort controller", async ({ eq }) => {
+  const geotiff = await GeoTIFF.fromFile("./data/wildfires.tiff");
+  const controller = new AbortController();
+  const { signal } = controller;
+  controller.abort();
+
+  const params = {
+    bbox: [-123.7412109375, 38.85205078124999, -119.1181640625, 42.29736328124999],
+    debug_level: 0,
+    srs: 4326,
+    geotiff,
+    signal
+  };
+
+  try {
+    await readBoundingBox(params);
+    throw new Error("AbortError was not thrown");
+  } catch (error) {
+    eq(error.message, "[geotiff-read-bbox] operation aborted");
+  }
+});