Implementing graceful shutdown (#105)

* Initial commit for graceful shutdown

* fmt

* Add .vscode to gitignore

* Updates shutdown logic to use channels

* fmt

* fmt

* Adds shutdown timeout

* Fmt and updates tomls

* Updates readme

* fmt and updates log levels

* Update python tests to test shutdown

* merge changes

* Rename listener rx and update bash to be in line with master

* Update python test bash script ordering

* Adds error response message before shutdown

* Add details on shutdown event loop

* Fixes response length for error

* Adds handler for sigterm

* Uses ready for query function and fixes number of bytes

* fmt

src/config.rs

@@ -119,6 +119,7 @@ pub struct General {
     pub port: i16,
     pub connect_timeout: u64,
     pub healthcheck_timeout: u64,
+    pub shutdown_timeout: u64,
     pub ban_time: i64,
     pub autoreload: bool,
     pub tls_certificate: Option<String>,
@@ -134,6 +135,7 @@ impl Default for General {
             port: 5432,
             connect_timeout: 5000,
             healthcheck_timeout: 1000,
+            shutdown_timeout: 60000,
             ban_time: 60,
             autoreload: false,
             tls_certificate: None,
@@ -273,6 +275,10 @@ impl From<&Config> for std::collections::HashMap<String, String> {
                 "healthcheck_timeout".to_string(),
                 config.general.healthcheck_timeout.to_string(),
             ),
+            (
+                "shutdown_timeout".to_string(),
+                config.general.shutdown_timeout.to_string(),
+            ),
             ("ban_time".to_string(), config.general.ban_time.to_string()),
         ];
 
@@ -290,6 +296,7 @@ impl Config {
             self.general.healthcheck_timeout
         );
         info!("Connection timeout: {}ms", self.general.connect_timeout);
+        info!("Shutdown timeout: {}ms", self.general.shutdown_timeout);
         match self.general.tls_certificate.clone() {
             Some(tls_certificate) => {
                 info!("TLS certificate: {}", tls_certificate);