reorg code, integration publish/subscribe working, still some TODOs

config.js

@@ -1,6 +1,37 @@
-const DIFFICULTY = 3;
-const MINE_RATE = 3000;
-const INITIAL_BALANCE = 500;
-const MINING_REWARD = 50;
+const fs = require('fs');
+const process = require('process');
 
-module.exports = { DIFFICULTY, MINE_RATE, INITIAL_BALANCE, MINING_REWARD };
+class Config {
+  constructor(location, disallow_arg_overide) {
+    //possible race if deleted after check, but we live with it I guess
+
+    const looking = location;
+
+    if (typeof disallow_arg_overide === undefined || disallow_arg_overide === null || !disallow_arg_overide) {
+      const args = process.argv.slice(2);
+      if (args.length > 0) {
+        looking = args[0];
+      }
+    }
+
+    if (fs.existsSync(looking)) {
+      const rawSettings = fs.readFileSync(looking, 'utf8');
+      this.settings = JSON.parse(rawSettings);
+    }
+  }
+
+  get(config) {
+    if (this.settings.hasOwnProperty(config.key)) {
+      const value = this.settings[config.key];
+      if (config.hasOwnProperty('transform')) {
+        return config.transform(value);
+      } else {
+        return value;
+      }
+    } else {
+      return config.default;
+    }
+  }
+}
+
+module.exports = Config;