Consolidate error handling for cache restore/save

src/cache-gradle-user-home.ts

@@ -3,7 +3,6 @@ import fs from 'fs'
 import os from 'os'
 import * as core from '@actions/core'
 import * as glob from '@actions/glob'
-import * as cache from '@actions/cache'
 import * as exec from '@actions/exec'
 
 import {AbstractCache} from './cache-utils'
@@ -72,22 +71,13 @@ export class GradleUserHomeCache extends AbstractCache {
             const key = path.relative(this.getGradleUserHome(), artifactFile)
             const cacheKey = `gradle-artifact-${key}`
 
-            try {
-                const restoreKey = await cache.restoreCache(
-                    [artifactFile],
-                    cacheKey
+            const restoreKey = await this.restoreCache([artifactFile], cacheKey)
+            if (restoreKey) {
+                this.debug(`Restored ${cacheKey} from cache to ${artifactFile}`)
+            } else {
+                this.debug(
+                    `Failed to restore from ${cacheKey} to ${artifactFile}`
                 )
-                if (restoreKey) {
-                    this.debug(
-                        `Restored ${cacheKey} from cache to ${artifactFile}`
-                    )
-                } else {
-                    core.warning(
-                        `Failed to restore from ${cacheKey} to ${artifactFile}`
-                    )
-                }
-            } catch (error) {
-                core.warning(`Error restoring ${cacheKey}: ${error}`)
             }
         } else {
             this.debug(
@@ -164,21 +154,7 @@ export class GradleUserHomeCache extends AbstractCache {
             const cacheKey = `gradle-artifact-${filePath}`
 
             this.debug(`Caching ${artifactFile} with cache key: ${cacheKey}`)
-            try {
-                await cache.saveCache([artifactFile], cacheKey)
-            } catch (error) {
-                // Fail on validation errors or non-errors (the latter to keep Typescript happy)
-                if (error instanceof cache.ValidationError) {
-                    throw error
-                } else if (error instanceof cache.ReserveCacheError) {
-                    // These are expected if the artifact is already cached
-                    this.debug(error.message)
-                } else if (error instanceof Error) {
-                    core.warning(error.message)
-                } else {
-                    core.warning(`${error}`)
-                }
-            }
+            await this.saveCache([artifactFile], cacheKey)
 
             // Write the marker file that will stand in place of the original
             fs.writeFileSync(markerFile, 'cached')

src/cache-utils.ts

@@ -91,7 +91,7 @@ export abstract class AbstractCache {
 
         core.saveState(this.cacheKeyStateKey, cacheKey.key)
 
-        const cacheResult = await cache.restoreCache(
+        const cacheResult = await this.restoreCache(
             this.getCachePath(),
             cacheKey.key,
             cacheKey.restoreKeys
@@ -112,6 +112,28 @@ export abstract class AbstractCache {
         return
     }
 
+    protected async restoreCache(
+        cachePath: string[],
+        cacheKey: string,
+        cacheRestoreKeys: string[] = []
+    ): Promise<string | undefined> {
+        try {
+            return await cache.restoreCache(
+                cachePath,
+                cacheKey,
+                cacheRestoreKeys
+            )
+        } catch (error) {
+            if (error instanceof cache.ValidationError) {
+                // Validation errors should fail the build action
+                throw error
+            }
+            // Warn about any other error and continue
+            core.warning(`Failed to restore ${cacheKey}: ${error}`)
+            return undefined
+        }
+    }
+
     async save(): Promise<void> {
         if (!this.cacheOutputExists()) {
             this.debug(`No ${this.cacheDescription} to cache.`)
@@ -138,22 +160,32 @@ export abstract class AbstractCache {
         core.info(
             `Caching ${this.cacheDescription} with cache key: ${cacheKey}`
         )
-        try {
-            await cache.saveCache(this.getCachePath(), cacheKey)
-        } catch (error) {
-            // Fail on validation errors or non-errors (the latter to keep Typescript happy)
-            if (
-                error instanceof cache.ValidationError ||
-                !(error instanceof Error)
-            ) {
-                throw error
-            }
-            core.warning(error.message)
-        }
+        const cachePath = this.getCachePath()
+        await this.saveCache(cachePath, cacheKey)
 
         return
     }
 
+    protected async saveCache(
+        cachePath: string[],
+        cacheKey: string
+    ): Promise<void> {
+        try {
+            await cache.saveCache(cachePath, cacheKey)
+        } catch (error) {
+            if (error instanceof cache.ValidationError) {
+                // Validation errors should fail the build action
+                throw error
+            } else if (error instanceof cache.ReserveCacheError) {
+                // Reserve cache errors are expected if the artifact has been previously cached
+                this.debug(error.message)
+            } else {
+                // Warn about any other error and continue
+                core.warning(String(error))
+            }
+        }
+    }
+
     protected debug(message: string): void {
         if (this.cacheDebuggingEnabled) {
             core.info(message)