File size: 6,204 Bytes
3144483 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 | import { PassThrough } from "node:stream";
import { finished } from "node:stream/promises";
import { describe, expect, it } from "vitest";
import { createDeferred } from "../../test/helpers/promise.js";
import { createAwaitedDecodedOutput, joinProcessCompletionAndOutput } from "./decoded-output.js";
describe("awaited decoded output", () => {
it("retains stdout when the source resumes and ends before subscription", async () => {
const source = new PassThrough();
const output = createAwaitedDecodedOutput(source, () => {});
try {
source.end("output before subscription");
source.resume();
await finished(source);
let received = "";
await output.consume((chunk) => {
received += chunk;
});
expect(received).toBe("output before subscription");
} finally {
output.close();
source.destroy();
}
});
it.each([false, true])(
"rejects closure before EOF (already closed: %s)",
async (alreadyClosed) => {
const source = new PassThrough();
if (alreadyClosed) {
source.destroy();
}
const stopped = createDeferred<unknown>();
const output = createAwaitedDecodedOutput(source, (error) => stopped.resolve(error));
const consumed = output.consume(() => {});
try {
source.destroy();
await expect(consumed).rejects.toThrow("Process stdout closed before EOF");
expect(await stopped.promise).toEqual(new Error("Process stdout closed before EOF"));
} finally {
output.close();
source.destroy();
await consumed.catch(() => undefined);
}
},
);
it("requests stop for a rejected consumer and joins native completion before rejecting", async () => {
const source = new PassThrough();
const stopped = createDeferred<unknown>();
const completion = createDeferred<{ code: number }>();
const failure = new Error("synthetic rejected consumer");
let stopCount = 0;
const output = createAwaitedDecodedOutput(source, (error) => {
stopCount += 1;
stopped.resolve(error);
});
const consumed = output.consume(async () => {
throw failure;
});
const joined = joinProcessCompletionAndOutput(completion.promise, consumed);
let settled = false;
void joined.then(
() => {
settled = true;
},
() => {
settled = true;
},
);
try {
source.write("input");
expect(await stopped.promise).toBe(failure);
source.end("discard after stop");
await finished(source);
await consumed.catch(() => undefined);
await Promise.resolve();
expect(stopCount).toBe(1);
expect(settled).toBe(false);
completion.resolve({ code: 0 });
await expect(joined).rejects.toBe(failure);
expect(stopCount).toBe(1);
} finally {
completion.resolve({ code: 0 });
output.close();
source.destroy();
await joined.catch(() => undefined);
}
});
it("keeps native backpressure and ordered delivery while consumption waits", async () => {
const source = new PassThrough();
const output = createAwaitedDecodedOutput(source, () => {});
const entered = createDeferred();
const release = createDeferred();
const chunks: string[] = [];
const consumed = output.consume(async (chunk) => {
chunks.push(chunk);
if (chunks.length === 1) {
entered.resolve();
await release.promise;
}
});
try {
source.write("first");
await entered.promise;
const remaining = "x".repeat(source.writableHighWaterMark);
source.write(remaining);
expect(source.write(remaining)).toBe(false);
source.end();
expect(output.drain()).toBe(consumed);
expect(chunks).toEqual(["first"]);
let settled = false;
void consumed.then(() => {
settled = true;
});
await Promise.resolve();
expect(settled).toBe(false);
release.resolve();
await consumed;
expect(chunks.join("")).toBe(`first${remaining}${remaining}`);
} finally {
release.resolve();
output.close();
source.destroy();
await consumed.catch(() => undefined);
}
});
it("joins the decoder tail consumer after source EOF", async () => {
const source = new PassThrough();
const output = createAwaitedDecodedOutput(source, () => {});
const entered = createDeferred();
const release = createDeferred();
const chunks: string[] = [];
const consumed = output.consume(async (chunk) => {
chunks.push(chunk);
entered.resolve();
await release.promise;
});
try {
source.write(Buffer.from([0xf0]));
source.end(Buffer.from([0x9f]));
await entered.promise;
expect(chunks).toEqual(["�"]);
let settled = false;
void consumed.then(() => {
settled = true;
});
await Promise.resolve();
expect(settled).toBe(false);
release.resolve();
await consumed;
} finally {
release.resolve();
output.close();
source.destroy();
await consumed.catch(() => undefined);
}
});
it("retains an accepted consumer after disposal until it settles", async () => {
const source = new PassThrough();
let stopCount = 0;
const output = createAwaitedDecodedOutput(source, () => {
stopCount += 1;
});
const entered = createDeferred();
const release = createDeferred();
const consumed = output.consume(async () => {
entered.resolve();
await release.promise;
});
try {
source.write("accepted");
await entered.promise;
output.close();
let settled = false;
void consumed.then(
() => {
settled = true;
},
() => {
settled = true;
},
);
await Promise.resolve();
expect(settled).toBe(false);
release.resolve();
await expect(consumed).rejects.toThrow("Process stdout consumption closed");
expect(stopCount).toBe(0);
} finally {
release.resolve();
output.close();
source.destroy();
await consumed.catch(() => undefined);
}
});
});
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