a76f30e5f2
* Move delay for Heroku Preboot from post-deploy to pre-success * Shorten arbitrary delay before first Fastly purge
56 lines
1.8 KiB
JavaScript
56 lines
1.8 KiB
JavaScript
import sleep from 'await-sleep'
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import got from 'got'
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const ONE_SECOND = 1000
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async function purgeFastlyBySurrogateKey({ apiToken, serviceId, surrogateKey }) {
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const key = surrogateKey
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const safeServiceId = encodeURIComponent(serviceId)
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const headers = {
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'fastly-key': apiToken,
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accept: 'application/json',
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'fastly-soft-purge': '1',
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}
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const requestPath = `https://api.fastly.com/service/${safeServiceId}/purge/${key}`
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return got.post(requestPath, { headers, json: true })
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}
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export default async function purgeEdgeCache() {
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// Give the app some extra time to wake up before the thundering herd of
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// Fastly requests.
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const delayBeforeFirstPurge = 30 * ONE_SECOND
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// Evidence has shown that it's necessary to purge twice to ensure all
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// customers see fresh content.
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const delayBeforeSecondPurge = 5 * ONE_SECOND
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console.log('Fastly purgeEdgeCache initialized...')
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const { FASTLY_TOKEN, FASTLY_SERVICE_ID, FASTLY_SURROGATE_KEY } = process.env
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if (!FASTLY_TOKEN || !FASTLY_SERVICE_ID || !FASTLY_SURROGATE_KEY) {
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console.log('Fastly env vars not detected; skipping purgeEdgeCache step')
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return
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}
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const purgingParams = {
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apiToken: FASTLY_TOKEN,
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serviceId: FASTLY_SERVICE_ID,
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surrogateKey: FASTLY_SURROGATE_KEY,
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}
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console.log('Waiting extra time to prevent a Thundering Herd problem...')
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await sleep(delayBeforeFirstPurge)
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console.log('Attempting first Fastly purge...')
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const firstPurge = await purgeFastlyBySurrogateKey(purgingParams)
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console.log('First Fastly purge result:', firstPurge.body || firstPurge)
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console.log('Waiting to purge a second time...')
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await sleep(delayBeforeSecondPurge)
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console.log('Attempting second Fastly purge...')
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const secondPurge = await purgeFastlyBySurrogateKey(purgingParams)
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console.log('Second Fastly purge result:', secondPurge.body || secondPurge)
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}
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