Cache wrapper installation

src/cache.ts

@@ -1,9 +1,11 @@
 import * as core from '@actions/core'
+import * as cache from '@actions/cache'
 import * as path from 'path'
 import * as fs from 'fs'
 
 const WRAPPER_CACHE_KEY = 'WRAPPER_CACHE_KEY'
 const WRAPPER_CACHE_PATH = 'WRAPPER_CACHE_PATH'
+const WRAPPER_CACHE_RESULT = 'WRAPPER_CACHE_RESULT'
 
 export async function restoreCachedWrapperDist(
     executableDirectory: string
@@ -14,21 +16,63 @@ export async function restoreCachedWrapperDist(
             'gradle/wrapper/gradle-wrapper.properties'
         )
     )
+    if (!wrapperSlug) return
+
     const wrapperCacheKey = `wrapper-${wrapperSlug}`
     const wrapperCachePath = path.join(
         process.env.HOME!,
         `.gradle/wrapper/dists/gradle-${wrapperSlug}`
     )
-    core.info(`${WRAPPER_CACHE_KEY} = ${wrapperCacheKey}`)
-    core.info(`${WRAPPER_CACHE_PATH} = ${wrapperCachePath}`)
+
     core.saveState(WRAPPER_CACHE_KEY, wrapperCacheKey)
     core.saveState(WRAPPER_CACHE_PATH, wrapperCachePath)
+
+    const restoredKey = await cache.restoreCache(
+        [wrapperCachePath],
+        wrapperCacheKey
+    )
+
+    if (!restoredKey) {
+        core.info(
+            'Wrapper installation cache not found, expect a Gradle distribution download.'
+        )
+        return
+    }
+
+    core.saveState(WRAPPER_CACHE_RESULT, restoredKey)
+    core.info(`Wrapper installation restored from cache key: ${restoredKey}`)
     return
 }
 
 export async function cacheWrapperDist(): Promise<void> {
-    core.info(`${WRAPPER_CACHE_KEY} = ${core.getState(WRAPPER_CACHE_KEY)}`)
-    core.info(`${WRAPPER_CACHE_PATH} = ${core.getState(WRAPPER_CACHE_PATH)}`)
+    const cacheKey = core.getState(WRAPPER_CACHE_KEY)
+    const cachePath = core.getState(WRAPPER_CACHE_PATH)
+    const cacheResult = core.getState(WRAPPER_CACHE_RESULT)
+
+    if (!cachePath) {
+        core.debug('No wrapper installation to cache.')
+        return
+    }
+
+    if (cacheResult && cacheKey === cacheResult) {
+        core.info(
+            `Wrapper installation cache hit occurred on the cache key ${cacheKey}, not saving cache.`
+        )
+        return
+    }
+
+    try {
+        await cache.saveCache([cachePath], cacheKey)
+    } catch (error) {
+        if (error.name === cache.ValidationError.name) {
+            throw error
+        } else if (error.name === cache.ReserveCacheError.name) {
+            core.info(error.message)
+        } else {
+            core.info(`[warning] ${error.message}`)
+        }
+    }
+
     return
 }
 

src/main.ts

@@ -56,9 +56,11 @@ async function resolveGradleExecutable(baseDirectory: string): Promise<string> {
 
 function resolveBuildRootDirectory(baseDirectory: string): string {
     const buildRootDirectory = inputOrNull('build-root-directory')
-    return buildRootDirectory === null
+    const resolvedBuildRootDirectory =
+        buildRootDirectory === null
             ? path.resolve(baseDirectory)
             : path.resolve(baseDirectory, buildRootDirectory)
+    return resolvedBuildRootDirectory
 }
 
 function parseCommandLineArguments(): string[] {

src/post.ts

@@ -1,9 +1,7 @@
-import * as core from '@actions/core'
 import * as cache from './cache'
 
 // Invoked by GitHub Actions
 export async function run(): Promise<void> {
-    core.info('POST Gradle Command Action')
     await cache.cacheWrapperDist()
 }