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refactor: fastFailMetadataRequest to use Promise.any #603

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danielbankhead opened this issue Nov 10, 2023 · 2 comments · May be fixed by #604
Open

refactor: fastFailMetadataRequest to use Promise.any #603

danielbankhead opened this issue Nov 10, 2023 · 2 comments · May be fixed by #604
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@Dhoni77
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good first issue This issue is a good place to started contributing to this repository. next major: breaking change this is a change that we should wait to bundle into the next major version priority: p3 Desirable enhancement or fix. May not be included in next release. semver: major Hint for users that this is an API breaking change. type: cleanup An internal cleanup or hygiene concern.

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@danielbankhead
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We can streamline fastFailMetadataRequest by using Promise.any in Node 15+ rather than Promise.race:

gcp-metadata/src/index.ts

Lines 179 to 229 in 92f258c

async function fastFailMetadataRequest<T>(
options: GaxiosOptions
): Promise<GaxiosResponse> {
const secondaryOptions = {
...options,
url: options.url!.replace(getBaseUrl(), getBaseUrl(SECONDARY_HOST_ADDRESS)),
};
// We race a connection between DNS/IP to metadata server. There are a couple
// reasons for this:
//
// 1. the DNS is slow in some GCP environments; by checking both, we might
// detect the runtime environment signficantly faster.
// 2. we can't just check the IP, which is tarpitted and slow to respond
// on a user's local machine.
//
// Additional logic has been added to make sure that we don't create an
// unhandled rejection in scenarios where a failure happens sometime
// after a success.
//
// Note, however, if a failure happens prior to a success, a rejection should
// occur, this is for folks running locally.
//
let responded = false;
const r1: Promise<GaxiosResponse> = request<T>(options)
.then(res => {
responded = true;
return res;
})
.catch(err => {
if (responded) {
return r2;
} else {
responded = true;
throw err;
}
});
const r2: Promise<GaxiosResponse> = request<T>(secondaryOptions)
.then(res => {
responded = true;
return res;
})
.catch(err => {
if (responded) {
return r1;
} else {
responded = true;
throw err;
}
});
return Promise.race([r1, r2]);
}

@danielbankhead danielbankhead added semver: major Hint for users that this is an API breaking change. type: cleanup An internal cleanup or hygiene concern. good first issue This issue is a good place to started contributing to this repository. priority: p3 Desirable enhancement or fix. May not be included in next release. next major: breaking change this is a change that we should wait to bundle into the next major version labels Nov 10, 2023
@Dhoni77
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Dhoni77 commented Nov 11, 2023

Hi @danielbankhead I would like to work on this

@Dhoni77 Dhoni77 linked a pull request Nov 13, 2023 that will close this issue
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@danielbankhead danielbankhead removed their assignment Nov 13, 2023
@danielbankhead
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Thanks @Dhoni77; note that this will require us to Node 16 (next stable), which will not happen for some time.

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@Dhoni77 Dhoni77

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good first issue This issue is a good place to started contributing to this repository. next major: breaking change this is a change that we should wait to bundle into the next major version priority: p3 Desirable enhancement or fix. May not be included in next release. semver: major Hint for users that this is an API breaking change. type: cleanup An internal cleanup or hygiene concern.
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refactor: fastFailMetadataRequest to use Promise.any Dhoni77/gcp-metadata
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@danielbankhead @Dhoni77