toolkit/packages/cache

@actions/cache

Functions necessary for caching dependencies and build outputs to improve workflow execution time.

See "Caching dependencies to speed up workflows" for how caching works.

Note that GitHub will remove any cache entries that have not been accessed in over 7 days. There is no limit on the number of caches you can store, but the total size of all caches in a repository is limited to 10 GB. If you exceed this limit, GitHub will save your cache but will begin evicting caches until the total size is less than 10 GB.

Usage

This package is used by the v2+ versions of our first party cache action. You can find an example implementation in the cache repo here.

Save Cache

Saves a cache containing the files in paths using the key provided. The files would be compressed using zstandard compression algorithm if zstd is installed, otherwise gzip is used. Function returns the cache id if the cache was saved succesfully and throws an error if cache upload fails.

const cache = require('@actions/cache');
const paths = [
    'node_modules',
    'packages/*/node_modules/'
]
const key = 'npm-foobar-d5ea0750'
const cacheId = await cache.saveCache(paths, key)

Restore Cache

Restores a cache based on key and restoreKeys to the paths provided. Function returns the cache key for cache hit and returns undefined if cache not found.

const cache = require('@actions/cache');
const paths = [
    'node_modules',
    'packages/*/node_modules/'
]
const key = 'npm-foobar-d5ea0750'
const restoreKeys = [
    'npm-foobar-',
    'npm-'
]
const cacheKey = await cache.restoreCache(paths, key, restoreKeys)

Cache segment restore timeout

Starting v3.0.5 of actions/toolkit, in case any issue occurs while downloading the cache, the download will be aborted by default within 1 hour if any segment doesn't download completely. A segment is limited to size of 1GB for a 32-bit runner and 2GB for a 64-bit runner. So for any cache that exceeds the size of one segment, multiple segments will be downloaded in sequence to complete the download.

To customise the segment download timeout, an environment variable SEGMENT_DOWNLOAD_TIMEOUT_MINS needs to be set with the timeout minutes. This way the download wouldn't get stuck forever and proceed to next step in the workflow without any problem.