Add standard Rust attributes. (#24)

Signed-off-by: Yaroslav Skopets <yaroslav@tetrate.io>

Author: yskopets

src/types.rs

@@ -19,7 +19,7 @@ pub type NewStreamContext = fn(context_id: u32, root_context_id: u32) -> Box<dyn
 pub type NewHttpContext = fn(context_id: u32, root_context_id: u32) -> Box<dyn HttpContext>;
 
 #[repr(u32)]
-#[derive(Debug)]
+#[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
 pub enum LogLevel {
     Trace = 0,
     Debug = 1,
@@ -30,14 +30,16 @@ pub enum LogLevel {
 }
 
 #[repr(u32)]
-#[derive(Debug)]
+#[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+#[non_exhaustive]
 pub enum Action {
     Continue = 0,
     Pause = 1,
 }
 
 #[repr(u32)]
-#[derive(Debug)]
+#[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+#[non_exhaustive]
 pub enum Status {
     Ok = 0,
     NotFound = 1,
@@ -49,14 +51,16 @@ pub enum Status {
 }
 
 #[repr(u32)]
-#[derive(Debug)]
+#[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+#[non_exhaustive]
 pub enum ContextType {
     HttpContext = 0,
     StreamContext = 1,
 }
 
 #[repr(u32)]
-#[derive(Debug)]
+#[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+#[non_exhaustive]
 pub enum BufferType {
     HttpRequestBody = 0,
     HttpResponseBody = 1,
@@ -67,7 +71,8 @@ pub enum BufferType {
 }
 
 #[repr(u32)]
-#[derive(Debug)]
+#[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+#[non_exhaustive]
 pub enum MapType {
     HttpRequestHeaders = 0,
     HttpRequestTrailers = 1,
@@ -80,15 +85,17 @@ pub enum MapType {
 }
 
 #[repr(u32)]
-#[derive(Debug)]
+#[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+#[non_exhaustive]
 pub enum PeerType {
     Unknown = 0,
     Local = 1,
     Remote = 2,
 }
 
 #[repr(u32)]
-#[derive(Debug)]
+#[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+#[non_exhaustive]
 pub enum MetricType {
     Counter = 0,
     Gauge = 1,