style: reorder funcions

src/async_resolver/state_block.rs

@@ -158,6 +158,23 @@ impl StateBlock {
         }
     }
 
+    /// Decrements the `request_global_counter` of the request.
+    /// 
+    /// This function should be called each time the resolver performs work on behalf
+    /// of the request. If the counter passes zero, the request is terminated with a 
+    /// temporary error.
+    /// 
+    /// # Example
+    /// ```
+    /// let mut state_block = StateBlock::new(Instant::now());
+    /// state_block.decrement_request_global_counter();
+    /// ```
+    pub fn decrement_request_global_counter(&mut self) {
+        self.request_global_counter -= 1;
+
+        // TODO: Implement the logic to terminate the request if the counter reaches zero.
+    }
+
     /// Returns a reference to the `timestamp` of the request.
     pub fn get_timestamp(&self) -> &Instant {
         return &self.timestamp;
@@ -167,6 +184,92 @@ impl StateBlock {
     pub fn get_request_global_counter(&self) -> u32 {
         return self.request_global_counter;
     }
+}/// This struct represent the state of information of a pending request.
+/// 
+/// [RFC 1035](https://datatracker.ietf.org/doc/html/rfc1035#section-7.1)
+/// 
+/// Since a resolver must be able to multiplex multiple requests if it is to
+/// perform its function efficiently, each pending request is usually
+/// represented in some block of state information.
+/// 
+/// The key algorithm uses the state information of the request to select the next name server address to
+/// query
+pub struct StateBlock {
+    /// A timestamp indicating the time the request began.
+    /// 
+    /// The timestamp is used to decide whether RRs in the database
+    /// can be used or are out of date. This timestamp uses the
+    /// absolute time format.
+    timestamp: Instant,
+}
+
+impl StateBlock {
+    /// Creates a new StateBlock for a request.
+    /// 
+    /// # Arguments
+    /// * `timestamp` - A Instant that represents the time the request began.
+    /// 
+    /// # Example
+    /// ```
+    /// let state_block = StateBlock::new(Instant::now());
+    /// ```
+    pub fn new() -> StateBlock {
+        StateBlock {
+            timestamp: Instant::now(),
+        }
+    }
+
+    /// Returns a reference to the `timestamp` of the request.
+    pub fn get_timestamp(&self) -> &Instant {
+        return &self.timestamp;
+    }
+
+}use tokio::time::Instant;
+
+/// This struct represent the state of information of a pending request.
+/// 
+/// [RFC 1035](https://datatracker.ietf.org/doc/html/rfc1035#section-7.1)
+/// 
+/// Since a resolver must be able to multiplex multiple requests if it is to
+/// perform its function efficiently, each pending request is usually
+/// represented in some block of state information.
+/// 
+/// The key algorithm uses the state information of the request to select the 
+/// next name server address to query.
+pub struct StateBlock {
+    /// A timestamp indicating the time the request began.
+    /// 
+    /// The timestamp is used to decide whether RRs in the database
+    /// can be used or are out of date. This timestamp uses the
+    /// absolute time format.
+    timestamp: Instant,
+
+    /// Global per-request counter to limit work on a single request.
+    /// 
+    /// This counter should be initialized to the value specified in the
+    /// request-global limit field of the resolver configuration. It must 
+    /// be decremented each time the resolver performs work on behalf of
+    /// the request. If the counter reaches zero, the resolver must
+    /// return a response to the client.
+    request_global_counter: u32,
+}
+
+impl StateBlock {
+    /// Creates a new StateBlock for a request.
+    /// 
+    /// # Arguments
+    /// * `timestamp` - A Instant that represents the time the request began.
+    /// 
+    /// # Example
+    /// ```
+    /// let state_block = StateBlock::new(Instant::now());
+    /// ```
+    pub fn new(request_global_limit: u32) -> StateBlock {
+        StateBlock {
+            timestamp: Instant::now(),
+            request_global_counter: request_global_limit,
+        }
+    }
 
     /// Decrements the `request_global_counter` of the request.
     /// 
@@ -185,4 +288,13 @@ impl StateBlock {
         // TODO: Implement the logic to terminate the request if the counter reaches zero.
     }
 
+    /// Returns a reference to the `timestamp` of the request.
+    pub fn get_timestamp(&self) -> &Instant {
+        return &self.timestamp;
+    }
+
+    /// Returns a the `request_global_counter` of the request.
+    pub fn get_request_global_counter(&self) -> u32 {
+        return self.request_global_counter;
+    }
 }