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test("simple usage", done => {
var channel = new MessageChannel();
var port1 = channel.port1;
var port2 = channel.port2;
port2.onmessage = function (e) {
expect(e.data).toEqual("hello");
done();
};
port1.postMessage("hello");
});
test("transfer message port", done => {
var channel = new MessageChannel();
var anotherChannel = new MessageChannel();
var port1 = channel.port1;
var port2 = channel.port2;
port2.onmessage = function (e) {
expect(e.data).toEqual("hello");
expect(e.ports).toHaveLength(1);
expect(e.ports[0]).toBeInstanceOf(MessagePort);
done();
};
port1.postMessage("hello", [anotherChannel.port2]);
});
test("tranfer array buffer", done => {
var channel = new MessageChannel();
var port1 = channel.port1;
var port2 = channel.port2;
port2.onmessage = function (e) {
expect(e.data).toBeInstanceOf(ArrayBuffer);
expect(e.data.byteLength).toEqual(8);
done();
};
const buffer = new ArrayBuffer(8);
port1.postMessage(buffer, [buffer]);
});
test("non-transferable", () => {
var channel = new MessageChannel();
channel.port2.onmessage = function (e) {
expect().fail("should not be reached");
};
expect(() => {
channel.port1.postMessage("hello", [channel.port1]);
}).toThrow();
expect(() => {
channel.port1.postMessage("hello", [channel.port2]);
}).toThrow();
});
test("transfer message ports and post messages", done => {
var c1 = new MessageChannel();
var c2 = new MessageChannel();
c1.port1.onmessage = e => {
var port = e.ports[0];
expect(port).toBeInstanceOf(MessagePort);
expect(e.data).toEqual("hello from channel 1 port 2");
port.onmessage = e => {
expect(e.data).toEqual("hello from channel 1 port 2");
done();
};
port.postMessage("hello from channel 1 port 1", [c1.port1]);
};
c1.port2.onmessage = e => {
var port = e.ports[0];
expect(port).toBeInstanceOf(MessagePort);
expect(e.data).toEqual("hello from channel 2 port 1");
port.postMessage("hello from channel 1 port 2");
};
c2.port1.onmessage = e => {
var port = e.ports[0];
expect(port).toBeInstanceOf(MessagePort);
expect(e.data).toEqual("hello from channel 1 port 1");
port.postMessage("hello from channel 2 port 1", [c2.port1]);
};
c2.port2.onmessage = e => {
expect().fail("onmessage defined on c1.port1 should be called instead");
};
c1.port2.postMessage("hello from channel 1 port 2", [c2.port2]);
});
test("message channel created on main thread", done => {
var worker = new Worker(new URL("receive-port-worker.js", import.meta.url).href);
worker.onerror = e => {
expect().fail();
done();
};
var channel = new MessageChannel();
channel.port1.onmessage = e => {
if (e.data === "done!") return done();
expect(e.data).toEqual("received port!");
channel.port1.postMessage("more message!");
};
worker.postMessage(channel.port2, { transfer: [channel.port2] });
});
test("message channel created on other thread", done => {
var worker = new Worker(new URL("create-port-worker.js", import.meta.url).href);
worker.onerror = e => {
expect().fail();
done();
};
worker.onmessage = e => {
expect(e.data).toBeInstanceOf(MessagePort);
var port = e.data;
port.onmessage = (e: MessageEvent) => {
expect(e.data).toEqual("done!");
done();
};
port.postMessage("hello from main thread");
};
});
test("many message channels", done => {
var channel = new MessageChannel();
var channel2 = new MessageChannel();
var channel3 = new MessageChannel();
var channel4 = new MessageChannel();
channel.port1.postMessage("noport");
channel.port1.postMessage("zero ports", []);
channel.port1.postMessage("two ports", [channel2.port1, channel2.port2]);
// Now test various failure cases
expect(() => {
channel.port1.postMessage("same port", [channel.port1]);
}).toThrow();
expect(() => {
channel.port1.postMessage("entangled port", [channel.port2]);
}).toThrow();
expect(() => {
// @ts-ignore
channel.port1.postMessage("null port", [channel3.port1, null, channel3.port2]);
}).toThrow();
expect(() => {
// @ts-ignore
channel.port1.postMessage("notAPort", [channel3.port1, {}, channel3.port2]);
}).toThrow();
expect(() => {
channel.port1.postMessage("duplicate port", [channel3.port1, channel3.port1]);
}).toThrow();
// Should be OK to send channel3.port1 (should not have been disentangled by the previous failed calls).
expect(() => {
channel.port1.postMessage("entangled ports", [channel3.port1, channel3.port2]);
}).not.toThrow();
expect(() => {
// @ts-ignore
channel.port1.postMessage("notAnArray", "foo");
}).toThrow();
expect(() => {
// @ts-ignore
channel.port1.postMessage("notASequence", [{ length: 3 }]);
}).toThrow();
// Should not crash (we should figure out that the array contains undefined
// entries).
var largePortArray: MessagePort[] = [];
largePortArray[1234567890] = channel4.port1;
expect(() => {
channel.port1.postMessage("largeSequence", largePortArray);
}).toThrow();
channel.port1.postMessage("done");
function testTransfers(done: any) {
var channel0 = new MessageChannel();
var c1 = new MessageChannel();
channel0.port1.postMessage({ id: "send-port", port: c1.port1 }, [c1.port1]);
var c2 = new MessageChannel();
channel0.port1.postMessage({ id: "send-port-twice", port0: c2.port1, port1: c2.port1 }, [c2.port1]);
var c3 = new MessageChannel();
channel0.port1.postMessage({ id: "send-two-ports", port0: c3.port1, port1: c3.port2 }, [c3.port1, c3.port2]);
var c4 = new MessageChannel();
// Sending host objects should throw
expect(() => {
channel0.port1.postMessage({ id: "host-object", hostObject: c3, port: c4.port1 }, [c4.port1]);
}).toThrow();
// Sending Function object should throw
expect(() => {
var f1 = function () {};
channel0.port1.postMessage({ id: "function-object", function: f1, port: c4.port1 }, [c4.port1]);
}).toThrow();
// Sending Error object should not throw
expect(() => {
var err = new Error();
channel0.port1.postMessage({ id: "error-object", error: err, port: c4.port1 }, [c4.port1]);
}).not.toThrow();
c4.port1.postMessage("Should succeed");
channel0.port1.postMessage({ id: "done" });
channel0.port2.onmessage = function (event) {
if (event.data.id == "send-port") {
expect(event.ports.length).toBeGreaterThan(0);
expect(event.ports[0]).toBe(event.data.port);
} else if (event.data.id == "error-object") {
expect(event.data.error).toBeInstanceOf(Error);
} else if (event.data.id == "send-port-twice") {
expect(event.ports).toBeDefined();
expect(event.ports.length).toBe(1);
expect(event.ports[0]).toBe(event.data.port0);
expect(event.ports[0]).toBe(event.data.port1);
} else if (event.data.id == "send-two-ports") {
expect(event.ports).toBeDefined();
expect(event.ports.length).toBe(2);
expect(event.ports[0]).toBe(event.data.port0);
expect(event.ports[1]).toBe(event.data.port1);
} else if (event.data.id == "done") {
done();
} else {
expect().fail("branch should not be reached");
}
};
}
channel.port2.onmessage = function (event) {
if (event.data == "noport") {
expect(event.ports).toBeDefined();
expect(event.ports.length).toBe(0);
} else if (event.data == "zero ports") {
expect(event.ports).toBeDefined();
expect(event.ports.length).toBe(0);
} else if (event.data == "two ports") {
expect(event.ports).toBeDefined();
expect(event.ports.length).toBe(2);
} else if (event.data == "entangled ports") {
expect(event.ports).toBeDefined();
expect(event.ports.length).toBe(2);
} else if (event.data == "done") {
testTransfers(done);
} else {
expect().fail("branch should not be reached");
}
};
});
test("gc", () => {
for (let i = 0; i < 1000; i++) {
var e = new MessageChannel();
e.port1;
e.port2;
}
});
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