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Allow override of sections of cache key

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These internal env vars are designed primarily for testing,
but may also prove useful for folks to experiment with more optimal
caching setups.
This commit is contained in:
Daz DeBoer 2022-05-28 11:23:31 -06:00
parent 12be8b4772
commit 28b774ebdb
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2 changed files with 88 additions and 72 deletions
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68
src/cache-base.ts
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@ -1,83 +1,17 @@
import * as core from '@actions/core'
import * as exec from '@actions/exec'
import * as github from '@actions/github'
import path from 'path'
import fs from 'fs'
import {CacheListener} from './cache-reporting'
import {
getCacheKeyPrefix,
determineJobContext,
saveCache,
restoreCache,
cacheDebug,
isCacheDebuggingEnabled,
tryDelete
} from './cache-utils'
import {saveCache, restoreCache, cacheDebug, isCacheDebuggingEnabled, tryDelete, generateCacheKey} from './cache-utils'
import {ConfigurationCacheEntryExtractor, GradleHomeEntryExtractor} from './cache-extract-entries'
const CACHE_PROTOCOL_VERSION = 'v6-'
const RESTORED_CACHE_KEY_KEY = 'restored-cache-key'
export const META_FILE_DIR = '.gradle-build-action'
export const PROJECT_ROOTS_FILE = 'project-roots.txt'
const INCLUDE_PATHS_PARAMETER = 'gradle-home-cache-includes'
const EXCLUDE_PATHS_PARAMETER = 'gradle-home-cache-excludes'
const STRICT_CACHE_MATCH_PARAMETER = 'gradle-home-cache-strict-match'
/**
* Represents a key used to restore a cache entry.
* The Github Actions cache will first try for an exact match on the key.
* If that fails, it will try for a prefix match on any of the restoreKeys.
*/
class CacheKey {
key: string
restoreKeys: string[]
constructor(key: string, restoreKeys: string[]) {
this.key = key
this.restoreKeys = restoreKeys
}
}
/**
* Generates a cache key specific to the current job execution.
* The key is constructed from the following inputs:
* - A user-defined prefix (optional)
* - The cache protocol version
* - The name of the cache
* - The runner operating system
* - The name of the Job being executed
* - The matrix values for the Job being executed (job context)
* - The SHA of the commit being executed
*
* Caches are restored by trying to match the these key prefixes in order:
* - The full key with SHA
* - A previous key for this Job + matrix
* - Any previous key for this Job (any matrix)
* - Any previous key for this cache on the current OS
*/
function generateCacheKey(cacheName: string): CacheKey {
const cacheKeyBase = `${getCacheKeyPrefix()}${CACHE_PROTOCOL_VERSION}${cacheName}`
// At the most general level, share caches for all executions on the same OS
const runnerOs = process.env['RUNNER_OS'] || ''
const cacheKeyForOs = `${cacheKeyBase}|${runnerOs}`
// Prefer caches that run this job
const cacheKeyForJob = `${cacheKeyForOs}|${github.context.job}`
// Prefer (even more) jobs that run this job with the same context (matrix)
const cacheKeyForJobContext = `${cacheKeyForJob}[${determineJobContext()}]`
// Exact match on Git SHA
const cacheKey = `${cacheKeyForJobContext}-${github.context.sha}`
if (core.getBooleanInput(STRICT_CACHE_MATCH_PARAMETER)) {
return new CacheKey(cacheKey, [cacheKeyForJobContext])
}
return new CacheKey(cacheKey, [cacheKeyForJobContext, cacheKeyForJob, cacheKeyForOs])
}
export class GradleStateCache {
private cacheName: string

92
src/cache-utils.ts
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@ -1,17 +1,26 @@
import * as core from '@actions/core'
import * as cache from '@actions/cache'
import * as github from '@actions/github'
import * as crypto from 'crypto'
import * as path from 'path'
import * as fs from 'fs'
import {CacheEntryListener} from './cache-reporting'
const CACHE_PROTOCOL_VERSION = 'v6-'
const JOB_CONTEXT_PARAMETER = 'workflow-job-context'
const CACHE_DISABLED_PARAMETER = 'cache-disabled'
const CACHE_READONLY_PARAMETER = 'cache-read-only'
const CACHE_WRITEONLY_PARAMETER = 'cache-write-only'
const STRICT_CACHE_MATCH_PARAMETER = 'gradle-home-cache-strict-match'
const CACHE_DEBUG_VAR = 'GRADLE_BUILD_ACTION_CACHE_DEBUG_ENABLED'
const CACHE_PREFIX_VAR = 'GRADLE_BUILD_ACTION_CACHE_KEY_PREFIX'
const CACHE_KEY_PREFIX_VAR = 'GRADLE_BUILD_ACTION_CACHE_KEY_PREFIX'
const CACHE_KEY_OS_VAR = 'GRADLE_BUILD_ACTION_CACHE_KEY_ENVIRONMENT'
const CACHE_KEY_JOB_VAR = 'GRADLE_BUILD_ACTION_CACHE_KEY_JOB'
const CACHE_KEY_JOB_INSTANCE_VAR = 'GRADLE_BUILD_ACTION_CACHE_KEY_JOB_INSTANCE'
const CACHE_KEY_JOB_EXECUTION_VAR = 'GRADLE_BUILD_ACTION_CACHE_KEY_JOB_EXECUTION'
export function isCacheDisabled(): boolean {
return core.getBooleanInput(CACHE_DISABLED_PARAMETER)
@ -29,18 +38,91 @@ export function isCacheDebuggingEnabled(): boolean {
return process.env[CACHE_DEBUG_VAR] ? true : false
}
export function getCacheKeyPrefix(): string {
// Prefix can be used to force change all cache keys (defaults to cache protocol version)
return process.env[CACHE_PREFIX_VAR] || ''
/**
* Represents a key used to restore a cache entry.
* The Github Actions cache will first try for an exact match on the key.
* If that fails, it will try for a prefix match on any of the restoreKeys.
*/
export class CacheKey {
key: string
restoreKeys: string[]
constructor(key: string, restoreKeys: string[]) {
this.key = key
this.restoreKeys = restoreKeys
}
}
export function determineJobContext(): string {
/**
* Generates a cache key specific to the current job execution.
* The key is constructed from the following inputs (with some user overrides):
* - The cache protocol version
* - The name of the cache
* - The runner operating system
* - The name of the Job being executed
* - The matrix values for the Job being executed (job context)
* - The SHA of the commit being executed
*
* Caches are restored by trying to match the these key prefixes in order:
* - The full key with SHA
* - A previous key for this Job + matrix
* - Any previous key for this Job (any matrix)
* - Any previous key for this cache on the current OS
*/
export function generateCacheKey(cacheName: string): CacheKey {
const cacheKeyBase = `${getCacheKeyPrefix()}${CACHE_PROTOCOL_VERSION}${cacheName}`
// At the most general level, share caches for all executions on the same OS
const cacheKeyForEnvironment = `${cacheKeyBase}|${getCacheKeyEnvironment()}`
// Prefer caches that run this job
const cacheKeyForJob = `${cacheKeyForEnvironment}|${getCacheKeyJob()}`
// Prefer (even more) jobs that run this job with the same context (matrix)
const cacheKeyForJobContext = `${cacheKeyForJob}[${getCacheKeyJobInstance()}]`
// Exact match on Git SHA
const cacheKey = `${cacheKeyForJobContext}-${getCacheKeyJobExecution()}`
if (core.getBooleanInput(STRICT_CACHE_MATCH_PARAMETER)) {
return new CacheKey(cacheKey, [cacheKeyForJobContext])
}
return new CacheKey(cacheKey, [cacheKeyForJobContext, cacheKeyForJob, cacheKeyForEnvironment])
}
export function getCacheKeyPrefix(): string {
// Prefix can be used to force change all cache keys (defaults to cache protocol version)
return process.env[CACHE_KEY_PREFIX_VAR] || ''
}
function getCacheKeyEnvironment(): string {
const runnerOs = process.env['RUNNER_OS'] || ''
return process.env[CACHE_KEY_OS_VAR] || runnerOs
}
function getCacheKeyJob(): string {
// Prefix can be used to force change all cache keys (defaults to cache protocol version)
return process.env[CACHE_KEY_JOB_VAR] || github.context.job
}
function getCacheKeyJobInstance(): string {
const override = process.env[CACHE_KEY_JOB_INSTANCE_VAR]
if (override) {
return override
}
// By default, we hash the full `matrix` data for the run, to uniquely identify this job invocation
// The only way we can obtain the `matrix` data is via the `workflow-job-context` parameter in action.yml.
const workflowJobContext = core.getInput(JOB_CONTEXT_PARAMETER)
return hashStrings([workflowJobContext])
}
function getCacheKeyJobExecution(): string {
// Used to associate a cache key with a particular execution (default is bound to the git commit sha)
return process.env[CACHE_KEY_JOB_EXECUTION_VAR] || github.context.sha
}
export function hashFileNames(fileNames: string[]): string {
return hashStrings(fileNames.map(x => x.replace(new RegExp(`\\${path.sep}`, 'g'), '/')))
}