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denoland-deno/tests/specs/task/signals/sender.ts

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1.2 KiB
TypeScript

import { signals } from "./signals.ts";
class StdoutReader {
readonly #reader: ReadableStreamDefaultReader<string>;
#text = "";
constructor(stream: ReadableStream<Uint8Array>) {
const textStream = stream.pipeThrough(new TextDecoderStream());
this.#reader = textStream.getReader();
}
[Symbol.dispose]() {
this.#reader.releaseLock();
}
async waitForText(waitingText: string) {
if (this.#text.includes(waitingText)) {
return;
}
while (true) {
const { value, done } = await this.#reader.read();
if (value) {
this.#text += value;
if (this.#text.includes(waitingText)) {
break;
}
}
if (done) {
throw new Error("Did not find text: " + waitingText);
}
}
}
}
const command = new Deno.Command(Deno.execPath(), {
args: ["task", "listener"],
stdout: "piped",
});
const child = command.spawn();
const reader = new StdoutReader(child.stdout!);
await reader.waitForText("Ready");
for (const signal of signals) {
if (signal === "SIGTERM") {
continue;
}
console.error("Sending", signal);
child.kill(signal);
await reader.waitForText("Received " + signal);
}
console.error("Sending SIGTERM");
child.kill("SIGTERM");