add support for fetching random matrix and move to using domain names instead of IPs

labs/2/Main.java

@@ -9,11 +9,13 @@ import java.net.URL;
 import java.io.BufferedInputStream;
 import java.io.FileOutputStream;
 
-public class Main {
+import java.util.ArrayList;
 
+public class Main {
     public static void main(String[] args) {
         boolean help_enqueued = false;
         boolean allow_networking = true;
+        String matrix_file_name = "";
         int verbosity = 1;
         
         int p = 0;
@@ -32,8 +34,7 @@ public class Main {
                     p += 2;
                 }
                 else {
-                    System.err.println("[ERROR] Unknown argument found: " + args[p] + "\n[ERROR] Please, use 'java Main -h' for help");
-                    System.exit(1);
+                    matrix_file_name = args[p++];
                 }
             }
             catch (Exception e) {
@@ -47,6 +48,20 @@ public class Main {
             printHelp(allow_networking);
             System.exit(0);
         }
+
+        if (Objects.equals("", matrix_file_name)) {
+            System.err.println("[WARN] No filename specified to read from, using default one");
+            matrix_file_name = "random_matrix.txt";
+        }
+
+        File matrix_file = new File(matrix_file_name);
+        if (!matrix_file.exists()) {
+            if (allow_networking) {
+                System.err.println("[WARN] File is missing, downloading random matrix from the server");
+                fetchResource("http://lab2.kpi.dev:16554/matrix.py", matrix_file_name);
+            }
+        }
+
     }
 
     private static void fetchResource(String remote_url, String output_filename) {
@@ -72,7 +87,7 @@ public class Main {
                 System.err.println("[WARN] Help file is missing.");
                 if (allow_net) {
                     System.err.println("[INFO] Trying to recover it from the git server");
-                    fetchResource("http://139.162.162.130:3000/dymik739/oop-labs-collection/raw/branch/lab2-dev/labs/2/src/help.txt", "src/help.txt");
+                    fetchResource("http://lab2.kpi.dev:3000/dymik739/oop-labs-collection/raw/branch/lab2-dev/labs/2/src/help.txt", "src/help.txt");
                 } else {
                     System.err.println("[INFO] Networking is disabled, not recovering");
                     System.exit(1);
@@ -80,14 +95,12 @@ public class Main {
             }
     
             Scanner help_file_scanner = new Scanner(help_file);
-            String help_text = "";
 
             while (help_file_scanner.hasNextLine()) {
-                help_text += help_file_scanner.nextLine();
+                System.out.print(help_file_scanner.nextLine());
             }
     
             help_file_scanner.close(); 
-            System.out.println(help_text);
         } catch (Exception e) {
             System.out.println("[ERROR] Failed to read help due to the following exception: " + e);
             System.exit(1);

labs/2/matrix.py

@@ -0,0 +1,2 @@
+import random
+print("Content-Type: text/plain\n\n" + "\n".join([" ".join(list(map(str, [random.randint(-40, 40) for i in range(7)]))) for i in range(7)]))