Abort requests [#608] (#625)

* Properly abort requests using AbortController

* add basic adapter tests

---------

Co-authored-by: Andrew Dassonville <dassonville.andrew@gmail.com>

js/test/adapter.test.ts

@@ -0,0 +1,119 @@
+import assert from "node:assert";
+import { describe, mock, test } from "node:test";
+import { PMTiles, Protocol } from "../src";
+import { mockServer } from "./utils";
+
+describe("Protocol", () => {
+  test("get TileJSON", async () => {
+    mockServer.reset();
+    const pmtiles = new PMTiles("http://localhost:1337/example.pmtiles");
+    const protocol = new Protocol();
+    protocol.add(pmtiles);
+
+    const result = await protocol.tilev4(
+      {
+        url: "pmtiles://http://localhost:1337/example.pmtiles",
+        type: "json",
+      },
+      new AbortController()
+    );
+
+    assert.deepStrictEqual(result.data, {
+      tiles: ["pmtiles://http://localhost:1337/example.pmtiles/{z}/{x}/{y}"],
+      minzoom: 0,
+      maxzoom: 0,
+      bounds: [0, 0, 0.9999999, 1],
+    });
+    assert.equal(mockServer.numRequests, 1);
+  });
+
+  test("get tile data", async () => {
+    const pmtiles = new PMTiles("http://localhost:1337/example.pmtiles");
+    const protocol = new Protocol();
+    protocol.add(pmtiles);
+
+    const result = await protocol.tilev4(
+      {
+        url: "pmtiles://http://localhost:1337/example.pmtiles/0/0/0",
+        type: "arrayBuffer",
+      },
+      new AbortController()
+    );
+
+    assert.ok(result.data instanceof Uint8Array);
+    assert.strictEqual(result.data.length, 49);
+  });
+
+  test("returns empty data for missing tile if errorOnMissingTile is false", async () => {
+    const pmtiles = new PMTiles("http://localhost:1337/example.pmtiles");
+    const protocol = new Protocol({ errorOnMissingTile: false });
+    protocol.add(pmtiles);
+
+    const result = await protocol.tilev4(
+      {
+        url: "pmtiles://http://localhost:1337/example.pmtiles/25/0/0",
+        type: "arrayBuffer",
+      },
+      new AbortController()
+    );
+
+    assert.ok(result.data instanceof Uint8Array);
+    assert.strictEqual(result.data.length, 0);
+  });
+
+  test("throws error for missing tile if errorOnMissingTile is true", async () => {
+    const pmtiles = new PMTiles("http://localhost:1337/example.pmtiles");
+    const protocol = new Protocol({ errorOnMissingTile: true });
+    protocol.add(pmtiles);
+
+    const promise = protocol.tilev4(
+      {
+        url: "pmtiles://http://localhost:1337/example.pmtiles/25/0/0",
+        type: "arrayBuffer",
+      },
+      new AbortController()
+    );
+
+    assert.rejects(promise, { message: "Tile not found." });
+  });
+
+  test("throws AbortError when AbortController is signaled while accessing TileJSON", async () => {
+    const pmtiles = new PMTiles("http://localhost:1337/example.pmtiles");
+    const protocol = new Protocol();
+    protocol.add(pmtiles);
+
+    const abortController = new AbortController();
+
+    const resultPromise = protocol.tilev4(
+      {
+        url: "pmtiles://http://localhost:1337/example.pmtiles",
+        type: "json",
+      },
+      abortController
+    );
+
+    abortController.abort();
+
+    await assert.rejects(resultPromise, { name: "AbortError" });
+  });
+
+  test("throws AbortError when AbortController is signaled while accessing tile data", async () => {
+    const pmtiles = new PMTiles("http://localhost:1337/example.pmtiles");
+    const protocol = new Protocol();
+    protocol.add(pmtiles);
+
+    const abortController = new AbortController();
+
+    const resultPromise = protocol.tilev4(
+      {
+        url: "pmtiles://http://localhost:1337/example.pmtiles/0/0/0",
+        type: "arrayBuffer",
+      },
+      abortController
+    );
+
+    abortController.abort();
+
+    await assert.rejects(resultPromise, { name: "AbortError" });
+  });
+});