Report sizes of cache entries

Using the patched version of @actions/cache, we now report the total
size of cache entries restored/saved, as well as details of each one.

__tests__/cache-base.test.ts

@@ -5,7 +5,7 @@ describe('caching report', () => {
         it('with one requested entry report', async () => {
             const report = new CacheListener()
             report.entry('foo').markRequested('1', ['2'])
-            report.entry('bar').markRequested('3').markRestored('4')
+            report.entry('bar').markRequested('3').markRestored('4', 500)
             expect(report.fullyRestored).toBe(false)
         })
     })
@@ -22,13 +22,13 @@ describe('caching report', () => {
         })
         it('with restored entry report', async () => {
             const report = new CacheListener()
-            report.entry('bar').markRequested('3').markRestored('4')
+            report.entry('bar').markRequested('3').markRestored('4', 300)
             expect(report.fullyRestored).toBe(true)
         })
         it('with multiple restored entry reportss', async () => {
             const report = new CacheListener()
-            report.entry('foo').markRestored('4')
+            report.entry('foo').markRestored('4', 3300)
-            report.entry('bar').markRequested('3').markRestored('4')
+            report.entry('bar').markRequested('3').markRestored('4', 333)
             expect(report.fullyRestored).toBe(true)
         })
     })
@@ -64,7 +64,7 @@ describe('caching report', () => {
             const report = new CacheListener()
             const entryReport = report.entry('foo')
             entryReport.markRequested('1', ['2', '3'])
-            entryReport.markSaved('4')
+            entryReport.markSaved('4', 100)
 
             const stringRep = report.stringify()
             const reportClone: CacheListener = CacheListener.rehydrate(stringRep)
@@ -85,7 +85,7 @@ describe('caching report', () => {
 
             // Check type and call method on rehydrated entry report
             expect(entryClone).toBeInstanceOf(CacheEntryListener)
-            entryClone.markSaved('4')
+            entryClone.markSaved('4', 100)
 
             expect(entryClone.requestedKey).toBe('1')
             expect(entryClone.requestedRestoreKeys).toEqual(['2', '3'])

src/cache-base.ts

@@ -98,13 +98,15 @@ export class CacheEntryListener {
         return this
     }
 
-    markRestored(key: string): CacheEntryListener {
+    markRestored(key: string, size: number | undefined): CacheEntryListener {
         this.restoredKey = key
+        this.restoredSize = size
         return this
     }
 
-    markSaved(key: string): CacheEntryListener {
+    markSaved(key: string, size: number | undefined): CacheEntryListener {
         this.savedKey = key
+        this.savedSize = size
         return this
     }
 }
@@ -149,7 +151,7 @@ export abstract class AbstractCache {
         }
 
         core.saveState(this.cacheResultStateKey, cacheResult)
-        entryReport.markRestored(cacheResult)
+        entryReport.markRestored(cacheResult.key, cacheResult.size)
         core.info(`Restored ${this.cacheDescription} from cache key: ${cacheResult}`)
 
         try {
@@ -170,7 +172,7 @@ export abstract class AbstractCache {
         cachePath: string[],
         cacheKey: string,
         cacheRestoreKeys: string[] = []
-    ): Promise<string | undefined> {
+    ): Promise<cache.CacheEntry | undefined> {
         try {
             return await cache.restoreCache(cachePath, cacheKey, cacheRestoreKeys)
         } catch (error) {
@@ -214,18 +216,20 @@ export abstract class AbstractCache {
 
         core.info(`Caching ${this.cacheDescription} with cache key: ${cacheKey}`)
         const cachePath = this.getCachePath()
-        await this.saveCache(cachePath, cacheKey)
+        const savedEntry = await this.saveCache(cachePath, cacheKey)
 
-        listener.entry(this.cacheDescription).markSaved(cacheKey)
+        if (savedEntry) {
+            listener.entry(this.cacheDescription).markSaved(savedEntry.key, savedEntry.size)
+        }
 
         return
     }
 
     protected async beforeSave(_listener: CacheListener): Promise<void> {}
 
-    protected async saveCache(cachePath: string[], cacheKey: string): Promise<void> {
+    protected async saveCache(cachePath: string[], cacheKey: string): Promise<cache.CacheEntry | undefined> {
         try {
-            await cache.saveCache(cachePath, cacheKey)
+            return await cache.saveCache(cachePath, cacheKey)
         } catch (error) {
             if (error instanceof cache.ValidationError) {
                 // Validation errors should fail the build action
@@ -238,6 +242,7 @@ export abstract class AbstractCache {
                 core.warning(String(error))
             }
         }
+        return undefined
     }
 
     protected debug(message: string): void {

src/cache-gradle-user-home.ts

@@ -67,10 +67,10 @@ export class GradleUserHomeCache extends AbstractCache {
         const cacheKey = fs.readFileSync(bundleMetaFile, 'utf-8').trim()
         listener.markRequested(cacheKey)
 
-        const restoredKey = await this.restoreCache([bundlePattern], cacheKey)
+        const restoredEntry = await this.restoreCache([bundlePattern], cacheKey)
-        if (restoredKey) {
+        if (restoredEntry) {
             core.info(`Restored ${bundle} with key ${cacheKey} to ${bundlePattern}`)
-            listener.markRestored(restoredKey)
+            listener.markRestored(restoredEntry.key, restoredEntry.size)
         } else {
             core.info(`Did not restore ${bundle} with key ${cacheKey} to ${bundlePattern}`)
             tryDelete(bundleMetaFile)
@@ -154,9 +154,11 @@ export class GradleUserHomeCache extends AbstractCache {
             this.debug(`No change to previously restored ${bundle}. Not caching.`)
         } else {
             core.info(`Caching ${bundle} with cache key: ${cacheKey}`)
-            await this.saveCache([artifactPath], cacheKey)
+            const savedEntry = await this.saveCache([artifactPath], cacheKey)
+            if (savedEntry !== undefined) {
                 this.writeBundleMetaFile(bundleMetaFile, cacheKey)
-            listener.markSaved(cacheKey)
+                listener.markSaved(savedEntry.key, savedEntry.size)
+            }
         }
 
         for (const file of bundleFiles) {

src/caches.ts

@@ -2,7 +2,7 @@ import {GradleUserHomeCache} from './cache-gradle-user-home'
 import {ProjectDotGradleCache} from './cache-project-dot-gradle'
 import * as core from '@actions/core'
 import {isCacheDisabled, isCacheReadOnly} from './cache-utils'
-import {CacheListener} from './cache-base'
+import {CacheEntryListener, CacheListener} from './cache-base'
 
 const BUILD_ROOT_DIR = 'BUILD_ROOT_DIR'
 const CACHE_LISTENER = 'CACHE_LISTENER'
@@ -54,11 +54,41 @@ export async function save(): Promise<void> {
 }
 
 function logCachingReport(listener: CacheListener): void {
-    core.info('---------- CACHING REPORT -------------')
+    core.info(`---------- Caching Summary -------------
+Restored Entries Count: ${getCount(listener.cacheEntries, e => e.restoredSize)}
+                  Size: ${getSum(listener.cacheEntries, e => e.restoredSize)}
+Saved Entries    Count: ${getCount(listener.cacheEntries, e => e.savedSize)}
+                  Size: ${getSum(listener.cacheEntries, e => e.savedSize)}`)
+
+    core.startGroup('Cache Entry details')
     for (const entry of listener.cacheEntries) {
-        core.info(`${entry.entryName}
+        core.info(`Entry: ${entry.entryName}
     Requested Key : ${entry.requestedKey ?? ''}
     Restored  Key : ${entry.restoredKey ?? ''}
-    Saved Key    : ${entry.savedKey ?? ''}`)
+              Size: ${formatSize(entry.restoredSize)}
+    Saved     Key : ${entry.savedKey ?? ''}
+              Size: ${formatSize(entry.savedSize)}`)
     }
+    core.endGroup()
+}
+
+function getCount(
+    cacheEntries: CacheEntryListener[],
+    predicate: (value: CacheEntryListener) => number | undefined
+): number {
+    return cacheEntries.filter(e => predicate(e) !== undefined).length
+}
+
+function getSum(
+    cacheEntries: CacheEntryListener[],
+    predicate: (value: CacheEntryListener) => number | undefined
+): string {
+    return formatSize(cacheEntries.map(e => predicate(e) ?? 0).reduce((p, v) => p + v, 0))
+}
+
+function formatSize(bytes: number | undefined): string {
+    if (bytes === undefined || bytes === 0) {
+        return ''
+    }
+    return `${Math.round(bytes / (1024 * 1024))} MB (${bytes} B)`
 }