preventing server from crashing when client crashes; added RPI constant to let the server run without GPIOs

src/main.rs

@@ -18,7 +18,9 @@ fn handle_connection(stream: TcpStream, prot: &mut protocol::Protocol) -> Result
         let len = match reader.read_line(&mut text) {
             Ok(len) => len,
             Err(_) => {
+                if protocol::DEBUG {
                     println!("Reading line from client failed!");
+                }
                 0
             },
         };
@@ -26,14 +28,18 @@ fn handle_connection(stream: TcpStream, prot: &mut protocol::Protocol) -> Result
         if len == 0 {
             break;
         }
+        if protocol::DEBUG {
             println!("read: {}", text);
+        }
         match prot.parse(&text) {
             Ok(response) => {
                 match writeln!(outstream,"{}",response) {
                     Ok(_) => (),
                     Err(_) => {
                         prot.stop();
-                        println!("Write to TCP Stream failed")
+                        if protocol::DEBUG {
+                            println!("Write to TCP Stream failed");
+                        }
                     },
                 }
             },
@@ -42,7 +48,9 @@ fn handle_connection(stream: TcpStream, prot: &mut protocol::Protocol) -> Result
                     Ok(_) => (),
                     Err(_) => {
                         prot.stop();
-                        println!("Write to TCP Stream failed")
+                        if protocol::DEBUG {
+                            println!("Write to TCP Stream failed");
+                        }
                     },
                 }
             }

src/protocol.rs

@@ -3,6 +3,7 @@ extern crate gpio;
 use gpio::GpioOut;
 
 pub static RPI: bool = true;
+pub static DEBUG: bool = false;
 
 struct Segment {
     nextval: bool,
@@ -94,9 +95,11 @@ impl Protocol {
                 if RPI {
                     self.segments[index].set_nextval(value);
                 } else {
+                    if DEBUG {
                         println!("segment {} = {}", index, value);
                     }
                 }
+            }
             "display" => {
                 //show the saved state on the display
 
@@ -104,14 +107,22 @@ impl Protocol {
                     for i in 0..8 {
                         match self.segments[i].show() {
                             Ok(_) => (),
-                            Err(e) => println!("{}", e),
+                            Err(e) => {
+                                if DEBUG {
+                                    println!("{}", e)
+                                }
+                            },
                         }
                     }
                 } else {
-                    println!("showing segments")
+                    if DEBUG {
+                        println!("showing segments");
                     }
+                }
+                if DEBUG {
                     println!();
                 }
+            }
             "exit" => {
                 //close connection
                 println!("Closing connection.");