Merge pull request #2 from JsSucks/utils

FileUtils

client/src/modules/index.js

@@ -1,4 +1,4 @@
-export { Logger, Utils } from './utils';
+export { Logger, Utils, FileUtils } from './utils';
 export { PluginManager } from './pluginmanager';
 export { Pluging } from './plugin';
 export { BDIpc } from './bdipc';

client/src/modules/utils.js

@@ -49,6 +49,92 @@ class Utils {
         }
     }
 
+    static async tryParseJson(jsonString) {
+        try {
+            return JSON.parse(jsonString);
+        } catch (err) {
+            throw ({
+                'message': 'Failed to parse json',
+                err
+            });
+        }
+    }
+    
 }
 
-module.exports = { Logger, Utils }
+class FileUtils {
+
+    static async fileExists(path) {
+        return new Promise((resolve, reject) => {
+            fs.stat(path, (err, stats) => {
+                if (err) return reject({
+                    'message': `No such file or directory: ${err.path}`,
+                    err
+                });
+
+                if (!stats.isFile()) return reject({
+                    'message': `Not a file: ${path}`,
+                    stats
+                });
+
+                resolve();
+            });
+        });
+    }
+
+    static async directoryExists(path) {
+        return new Promise(resolve => {
+            fs.stat(path, (err, stats) => {
+                if (err) return reject({
+                    'message': `Directory does not exist: ${path}`,
+                    err
+                });
+
+                if (!stats.isDirectory()) return reject({
+                    'message': `Not a directory: ${path}`,
+                    stats
+                });
+
+                resolve();
+            });
+        });
+    }
+
+    static async readFile(path) {
+        try {
+            await this.fileExists(path);
+        } catch (err) {
+            throw (err);
+        }
+
+        return new Promise(resolve => {
+            fs.readFile(path, 'utf-8', (err, data) => {
+                if (err) reject({
+                    'message': `Could not read file: ${path}`,
+                    err
+                });
+
+                resolve(data);
+            });
+        });
+    }
+
+    static async readJsonFromFile(path) {
+        let readFile;
+        try {
+            readFile = await this.readFile(path);
+        } catch (err) {
+            throw (err);
+        }
+
+        try {
+            const parsed = await Utils.tryParseJson(readFile);
+            return parsed;
+        } catch (err) {
+            throw (Object.assign(err, { path }));
+        }
+    }
+}
+
+
+module.exports = { Logger, Utils, FileUtils }