Add node's caching implementation (#2)

* first iteration for implementation of caching

* add logs

* add debug line

* fix build command

* fix path

* add possible post-if

* remove braces

* test new action post-if variant

* work on built-in caching

* remove post-if

* pass version

* work on yarn support

* fix return value

* change names and remove logs

* worked on resolving comments

* check post-if for null

* add success() condition

* remove primary key field

* work on resolving comments

* remove logs

* resolving comments

* resolving comments

* resolving comments

* resolving comments

* fix getpackageManagerVersion

* run clean for unstaged changes

* fix falling version tests

* work on resolving comments

* resolving comments

* fix comment

* resolve comments

* Add tests to cover node's caching (#3)

* add tests to cover node's caching

* work on fixing tests

* fix e2e tests

* rebuild and fix test

* fixing tests

* change name of describes, it and fix test

* add names for jobs

* fix issue

src/cache-restore.ts

@@ -0,0 +1,57 @@
+import * as cache from '@actions/cache';
+import * as core from '@actions/core';
+import * as glob from '@actions/glob';
+import path from 'path';
+import fs from 'fs';
+
+import {State, Outputs} from './constants';
+import {
+  getCacheDirectoryPath,
+  getPackageManagerInfo,
+  PackageManagerInfo
+} from './cache-utils';
+
+export const restoreCache = async (packageManager: string) => {
+  const packageManagerInfo = await getPackageManagerInfo(packageManager);
+  if (!packageManagerInfo) {
+    throw new Error(`Caching for '${packageManager}' is not supported`);
+  }
+  const platform = process.env.RUNNER_OS;
+
+  const cachePath = await getCacheDirectoryPath(
+    packageManagerInfo,
+    packageManager
+  );
+  const lockFilePath = findLockFile(packageManagerInfo);
+  const fileHash = await glob.hashFiles(lockFilePath);
+
+  const primaryKey = `${platform}-${packageManager}-${fileHash}`;
+  core.debug(`primary key is ${primaryKey}`);
+
+  core.saveState(State.CachePrimaryKey, primaryKey);
+
+  const cacheKey = await cache.restoreCache([cachePath], primaryKey);
+
+  if (!cacheKey) {
+    core.info(`${packageManager} cache is not found`);
+    return;
+  }
+
+  core.saveState(State.CacheMatchedKey, cacheKey);
+  core.info(`Cache restored from key: ${cacheKey}`);
+};
+
+const findLockFile = (packageManager: PackageManagerInfo) => {
+  let lockFiles = packageManager.lockFilePatterns;
+  const workspace = process.env.GITHUB_WORKSPACE!;
+  const rootContent = fs.readdirSync(workspace);
+
+  const lockFile = lockFiles.find(item => rootContent.includes(item));
+  if (!lockFile) {
+    throw new Error(
+      `Dependencies lock file is not found in ${workspace}. Supported file patterns: ${lockFiles.toString()}`
+    );
+  }
+
+  return path.join(workspace, lockFile);
+};