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async_hooks: add AsyncLocal class #27172

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Flarna wants to merge 6 commits into from
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async_hooks: add AsyncLocal class #27172

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2afe57a
async_hooks: add AsyncLocal class
Flarna Mar 27, 2019
a80e811
fix lint CRLF => LF
Flarna Apr 10, 2019
9ec3977
Add test to re-enter an AsyncResource
Flarna Apr 10, 2019
1cef6c3
Improve docs, throw on setting a new value from onChangedCb
Flarna Apr 19, 2019
593552e
fix lint-md issue
Flarna Dec 16, 2019
dfe9477
add one more await test
Flarna Dec 16, 2019
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Add test to re-enter an AsyncResource
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@Flarna
Flarna committed Dec 16, 2019
commit 9ec397756e3fd5bcb05ce445a64233324bbf6fb1
45 changes: 45 additions & 0 deletions test/async-hooks/test-async-local.js
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Original file line number Diff line number Diff line change
Expand Up @@ -171,3 +171,48 @@ const { AsyncLocal, AsyncResource } = require('async_hooks');
}));
}));
}

{
const exp = [
[ undefined, 'A', false ],
[ 'A', 'B', false ],
[ 'B', 'A', true ],
[ 'A', 'B', true ],
[ 'B', 'A', true ],
];

const act = [];
const asyncLocal = new AsyncLocal({
onChangedCb: (p, c, t) => act.push([p, c, t])
});

asyncLocal.value = 'A';
const asyncRes1 = new AsyncResource('Resource1');
const asyncRes2 = new AsyncResource('Resource2');
assert.strictEqual(act.length, 1);

asyncRes1.runInAsyncScope(common.mustCall(() => {
assert.strictEqual(asyncLocal.value, 'A');
asyncRes1.runInAsyncScope(common.mustCall(() => {
assert.strictEqual(asyncLocal.value, 'A');
asyncRes2.runInAsyncScope(common.mustCall(() => {
assert.strictEqual(asyncLocal.value, 'A');
asyncLocal.value = 'B';
assert.strictEqual(act.length, 2);
asyncRes1.runInAsyncScope(common.mustCall(() => {
assert.strictEqual(asyncLocal.value, 'A');
assert.strictEqual(act.length, 3);
}));
assert.strictEqual(act.length, 4);
assert.strictEqual(asyncLocal.value, 'B');
}));
assert.strictEqual(act.length, 5);
assert.strictEqual(asyncLocal.value, 'A');
}));
assert.strictEqual(asyncLocal.value, 'A');
}));

assert.strictEqual(act.length, 5);

assert.deepStrictEqual(act, exp);
}