move flags to its own module.

vault/src/app.ts

@@ -3,38 +3,20 @@ import { MongoClient } from 'mongodb'
 
 import { CharacterService } from './character_service'
 import { DatabaseService } from './database'
-import { Command } from 'commander'
+import { Flags } from './flags'
-// import { Flag } from './flags'
 
-// const portFlag = new Flag<number>('-p', 8080)
+const flags = new Flags()
 
-const program = new Command()
+const port = flags.getPort()
-
-program
-  .option('-p, --port <number>', 'server port number', '8080')
-  .option(
-    '--mongoPath <string>',
-    'mongo db path',
-    'mongodb://rushvault:rushvault@mongo:27017/',
-  )
-  .option(
-    '--mongoDb <string>',
-    'name of the databse to store collections',
-    'rush-vault',
-  )
-
-program.parse()
-
-const port = program.opts().port
 
 const address = `0.0.0.0:${port}`
 
 const databaseService = new DatabaseService(
-  program.opts().mongoPath,
+  flags.getMongoDbAddress(),
-  program.opts().mongoDb,
+  flags.getMongoDbName(),
 )
-const characterService = new CharacterService(databaseService)
 
+const characterService = new CharacterService(databaseService)
 const app = new Server()
 
 app.bindAsync(address, ServerCredentials.createInsecure(), () => {

vault/src/flags.ts

@@ -0,0 +1,32 @@
+import { Command } from 'commander'
+
+export class Flags {
+  private readonly program = new Command()
+    .option('-p, --port <number>', 'server port number', '8080')
+    .option(
+      '--mongoPath <string>',
+      'mongo db path',
+      'mongodb://rushvault:rushvault@mongo:27017/',
+    )
+    .option(
+      '--mongoDb <string>',
+      'name of the databse to store collections',
+      'rush-vault',
+    )
+
+  constructor() {
+    this.program.parse()
+  }
+
+  getPort(): number {
+    return this.program.opts().port
+  }
+
+  getMongoDbAddress(): string {
+    return this.program.opts().mongoPath
+  }
+
+  getMongoDbName(): string {
+    return this.program.opts().mongoDb
+  }
+}