Connection processor: add a force TLS-accept timeout

Whenever TLS accept (tungstenite::accept(tls_stream))
blocks for too long (>15 seconds), stop trying
to accept the stream using tokio_selector.
This is done to ensure we don't have a hang
connection processor that might hang for a very
long period of time waiting for a connection to be
accepted.

Also run cargo fmt to fix some import indentation.

Signed-off-by: Oleksandr Mazur <oleksandr.mazur@plvision.eu>

src/cgw_connection_processor.rs

@@ -105,7 +105,24 @@ impl CGWConnectionProcessor {
         client_cn: MacAddress,
         allow_mismatch: bool,
     ) -> Result<()> {
-        let ws_stream = tokio_tungstenite::accept_async(tls_stream).await?;
+        let ws_stream = tokio::select! {
+            _val = tokio_tungstenite::accept_async(tls_stream) => {
+                match _val {
+                    Ok(s) => s,
+                    Err(e) => {
+                        error!("Failed to accept TLS stream from: {}! Reason: {}. Closing connection",
+                               self.addr, e);
+                        return Err(Error::ConnectionProcessor("Failed to accept TLS stream!"));
+                    }
+                }
+            }
+            // TODO: configurable duration (upon server creation)
+            _val = sleep(Duration::from_millis(15000)) => {
+                error!("Failed to accept TLS stream from: {}! Closing connection", self.addr);
+                return Err(Error::ConnectionProcessor("Failed to accept TLS stream for too long"));
+            }
+
+        };
 
         let (sink, mut stream) = ws_stream.split();
 

src/cgw_ucentral_switch_parser.rs

@@ -5,10 +5,10 @@ use std::{collections::HashMap, str::FromStr};
 use crate::cgw_errors::{Error, Result};
 
 use crate::cgw_ucentral_parser::{
-    CGWUCentralEvent, CGWUCentralEventLog, CGWUCentralEventState, CGWUCentralEventStateClients,
-    CGWUCentralEventStateClientsData, CGWUCentralEventStateClientsType,
-    CGWUCentralEventStateLLDPData, CGWUCentralEventStateLinks, CGWUCentralEventStatePort,
-    CGWUCentralEventType, CGWUCentralJRPCMessage, CGWUCentralEventReply
+    CGWUCentralEvent, CGWUCentralEventLog, CGWUCentralEventReply, CGWUCentralEventState,
+    CGWUCentralEventStateClients, CGWUCentralEventStateClientsData,
+    CGWUCentralEventStateClientsType, CGWUCentralEventStateLLDPData, CGWUCentralEventStateLinks,
+    CGWUCentralEventStatePort, CGWUCentralEventType, CGWUCentralJRPCMessage,
 };
 
 fn parse_lldp_data(