just printing the incoming traffic

chatserver.go

@@ -0,0 +1,70 @@
+package main
+
+import (
+  "flag"
+  "fmt"
+  "io"
+  "net"
+  "os"
+  "strconv"
+)
+
+func usage() {
+  fmt.Fprintf(os.Stderr, "\nusage: go run chatserver.go\n")
+  flag.PrintDefaults();
+  fmt.Println()
+
+  os.Exit(1)
+}
+
+func handleConnection(conn net.Conn) {
+  // Why don't these work?
+  //buf := make([]byte, 0, 1024)
+  //buf := []byte{}
+  // But this does
+  buf := make([]byte, 1024)
+  for {
+    count, err := conn.Read(buf)
+    if nil != err {
+      if io.EOF != err {
+        fmt.Fprintf(os.Stderr, "Non-EOF socket error: %s\n", err)
+      }
+      fmt.Fprintf(os.Stdout, "Ending socket\n")
+      break
+    }
+    // not so sure about why this case exists
+    // we'll just ignore it for now...
+    if 0 == count {
+      // fmt.Fprintf(os.Stdout, "Weird")
+      continue
+    }
+    fmt.Fprintf(os.Stdout, "Message:\n%s\n", buf[0:count])
+  }
+}
+
+func main() {
+  flag.Usage = usage
+  port:= flag.Uint("telnet-port", 4080, "tcp telnet chat port")
+  flag.Parse()
+  addr := ":" + strconv.Itoa(int(*port))
+
+
+  // https://golang.org/pkg/net/
+  sock, err := net.Listen("tcp", addr)
+  if nil != err {
+		fmt.Fprintf(os.Stderr, "Couldn't bind to TCP socket %q: %s\n", addr, err)
+		os.Exit(2)
+  }
+  fmt.Println("Listening on", addr);
+
+  for {
+    conn, err := sock.Accept()
+    if err != nil {
+      // Not sure what kind of error this could be or how it could happen.
+      // Could a connection abort or end before it's handled?
+      fmt.Fprintf(os.Stderr, "Error accepting connection:\n%s\n", err)
+    }
+    fmt.Fprintf(os.Stdout, "Accepting socket\n")
+    go handleConnection(conn)
+  }
+}