feat: introduce convenience Status::verify_active method

Similarly to ChannelEnd::verify_not_closed, introduce a convenience
method Status::verify_active which checks whether client’s status is
active and returns an error if it isn’t.  This simplifies whole bunch
of code locations making them more DRY.

.changelog/unreleased/improvements/1005-status-verify-active.md

@@ -0,0 +1,2 @@
+- Add ibc::core::client::types::Status::verify_active method.
+  ([#1005](https://github.com/cosmos/ibc-rs/pull/1005))

ibc-core/ics02-client/src/handler/update_client.rs

@@ -28,12 +28,9 @@ where
     // Read client state from the host chain store. The client should already exist.
     let client_state = ctx.client_state(&client_id)?;
 
-    {
-        let status = client_state.status(ctx.get_client_validation_context(), &client_id)?;
-        if !status.is_active() {
-            return Err(ClientError::ClientNotActive { status }.into());
-        }
-    }
+    client_state
+        .status(ctx.get_client_validation_context(), &client_id)?
+        .verify_active()?;
 
     let client_message = msg.client_message();
 

ibc-core/ics02-client/src/handler/upgrade_client.rs

@@ -27,12 +27,9 @@ where
     let old_client_state = ctx.client_state(&client_id)?;
 
     // Check if the client is active.
-    {
-        let status = old_client_state.status(ctx.get_client_validation_context(), &client_id)?;
-        if !status.is_active() {
-            return Err(ClientError::ClientNotActive { status }.into());
-        }
-    }
+    old_client_state
+        .status(ctx.get_client_validation_context(), &client_id)?
+        .verify_active()?;
 
     // Read the latest consensus state from the host chain store.
     let old_client_cons_state_path = ClientConsensusStatePath::new(

ibc-core/ics02-client/types/src/status.rs

@@ -1,5 +1,7 @@
 use core::fmt::{Debug, Display, Formatter};
 
+use crate::error::ClientError;
+
 /// `UpdateKind` represents the 2 ways that a client can be updated
 /// in IBC: either through a `MsgUpdateClient`, or a `MsgSubmitMisbehaviour`.
 #[derive(Clone, Debug, PartialEq, Eq)]
@@ -38,6 +40,14 @@ impl Status {
     pub fn is_expired(&self) -> bool {
         *self == Status::Expired
     }
+
+    /// Checks whether the status is active; returns `Err` if not.
+    pub fn verify_active(&self) -> Result<(), ClientError> {
+        match self.clone() {
+            Self::Active => Ok(()),
+            status => Err(ClientError::ClientNotActive { status }),
+        }
+    }
 }
 
 impl Display for Status {

ibc-core/ics03-connection/src/handler/conn_open_ack.rs

@@ -56,13 +56,9 @@ where
     {
         let client_state_of_b_on_a = ctx_a.client_state(vars.client_id_on_a())?;
 
-        {
-            let status = client_state_of_b_on_a
-                .status(ctx_a.get_client_validation_context(), vars.client_id_on_a())?;
-            if !status.is_active() {
-                return Err(ClientError::ClientNotActive { status }.into());
-            }
-        }
+        client_state_of_b_on_a
+            .status(ctx_a.get_client_validation_context(), vars.client_id_on_a())?
+            .verify_active()?;
         client_state_of_b_on_a.validate_proof_height(msg.proofs_height_on_b)?;
 
         let client_cons_state_path_on_a = ClientConsensusStatePath::new(

ibc-core/ics03-connection/src/handler/conn_open_confirm.rs

@@ -45,13 +45,9 @@ where
     {
         let client_state_of_a_on_b = ctx_b.client_state(client_id_on_b)?;
 
-        {
-            let status = client_state_of_a_on_b
-                .status(ctx_b.get_client_validation_context(), client_id_on_b)?;
-            if !status.is_active() {
-                return Err(ClientError::ClientNotActive { status }.into());
-            }
-        }
+        client_state_of_a_on_b
+            .status(ctx_b.get_client_validation_context(), client_id_on_b)?
+            .verify_active()?;
         client_state_of_a_on_b.validate_proof_height(msg.proof_height_on_a)?;
 
         let client_cons_state_path_on_b = ClientConsensusStatePath::new(

ibc-core/ics03-connection/src/handler/conn_open_init.rs

@@ -20,13 +20,9 @@ where
     // An IBC client running on the local (host) chain should exist.
     let client_state_of_b_on_a = ctx_a.client_state(&msg.client_id_on_a)?;
 
-    {
-        let status = client_state_of_b_on_a
-            .status(ctx_a.get_client_validation_context(), &msg.client_id_on_a)?;
-        if !status.is_active() {
-            return Err(ClientError::ClientNotActive { status }.into());
-        }
-    }
+    client_state_of_b_on_a
+        .status(ctx_a.get_client_validation_context(), &msg.client_id_on_a)?
+        .verify_active()?;
 
     if let Some(version) = msg.version {
         version.verify_is_supported(&ctx_a.get_compatible_versions())?;

ibc-core/ics03-connection/src/handler/conn_open_try.rs

@@ -55,13 +55,9 @@ where
     {
         let client_state_of_a_on_b = ctx_b.client_state(vars.conn_end_on_b.client_id())?;
 
-        {
-            let status = client_state_of_a_on_b
-                .status(ctx_b.get_client_validation_context(), &msg.client_id_on_b)?;
-            if !status.is_active() {
-                return Err(ClientError::ClientNotActive { status }.into());
-            }
-        }
+        client_state_of_a_on_b
+            .status(ctx_b.get_client_validation_context(), &msg.client_id_on_b)?
+            .verify_active()?;
         client_state_of_a_on_b.validate_proof_height(msg.proofs_height_on_a)?;
 
         let client_cons_state_path_on_b = ClientConsensusStatePath::new(

ibc-core/ics04-channel/src/handler/acknowledgement.rs

@@ -178,13 +178,9 @@ where
         let client_id_on_a = conn_end_on_a.client_id();
         let client_state_of_b_on_a = ctx_a.client_state(client_id_on_a)?;
 
-        {
-            let status = client_state_of_b_on_a
-                .status(ctx_a.get_client_validation_context(), client_id_on_a)?;
-            if !status.is_active() {
-                return Err(ClientError::ClientNotActive { status }.into());
-            }
-        }
+        client_state_of_b_on_a
+            .status(ctx_a.get_client_validation_context(), client_id_on_a)?
+            .verify_active()?;
         client_state_of_b_on_a.validate_proof_height(msg.proof_height_on_b)?;
 
         let client_cons_state_path_on_a = ClientConsensusStatePath::new(

ibc-core/ics04-channel/src/handler/chan_close_confirm.rs

@@ -115,13 +115,9 @@ where
         let client_id_on_b = conn_end_on_b.client_id();
         let client_state_of_a_on_b = ctx_b.client_state(client_id_on_b)?;
 
-        {
-            let status = client_state_of_a_on_b
-                .status(ctx_b.get_client_validation_context(), client_id_on_b)?;
-            if !status.is_active() {
-                return Err(ClientError::ClientNotActive { status }.into());
-            }
-        }
+        client_state_of_a_on_b
+            .status(ctx_b.get_client_validation_context(), client_id_on_b)?
+            .verify_active()?;
         client_state_of_a_on_b.validate_proof_height(msg.proof_height_on_a)?;
 
         let client_cons_state_path_on_b = ClientConsensusStatePath::new(

ibc-core/ics04-channel/src/handler/chan_close_init.rs

@@ -112,13 +112,9 @@ where
 
     let client_id_on_a = conn_end_on_a.client_id();
     let client_state_of_b_on_a = ctx_a.client_state(client_id_on_a)?;
-    {
-        let status =
-            client_state_of_b_on_a.status(ctx_a.get_client_validation_context(), client_id_on_a)?;
-        if !status.is_active() {
-            return Err(ClientError::ClientNotActive { status }.into());
-        }
-    }
+    client_state_of_b_on_a
+        .status(ctx_a.get_client_validation_context(), client_id_on_a)?
+        .verify_active()?;
 
     Ok(())
 }

ibc-core/ics04-channel/src/handler/chan_open_ack.rs

@@ -112,13 +112,9 @@ where
         let client_id_on_a = conn_end_on_a.client_id();
         let client_state_of_b_on_a = ctx_a.client_state(client_id_on_a)?;
 
-        {
-            let status = client_state_of_b_on_a
-                .status(ctx_a.get_client_validation_context(), client_id_on_a)?;
-            if !status.is_active() {
-                return Err(ClientError::ClientNotActive { status }.into());
-            }
-        }
+        client_state_of_b_on_a
+            .status(ctx_a.get_client_validation_context(), client_id_on_a)?
+            .verify_active()?;
         client_state_of_b_on_a.validate_proof_height(msg.proof_height_on_b)?;
 
         let client_cons_state_path_on_a = ClientConsensusStatePath::new(

ibc-core/ics04-channel/src/handler/chan_open_confirm.rs

@@ -117,13 +117,9 @@ where
         let client_id_on_b = conn_end_on_b.client_id();
         let client_state_of_a_on_b = ctx_b.client_state(client_id_on_b)?;
 
-        {
-            let status = client_state_of_a_on_b
-                .status(ctx_b.get_client_validation_context(), client_id_on_b)?;
-            if !status.is_active() {
-                return Err(ClientError::ClientNotActive { status }.into());
-            }
-        }
+        client_state_of_a_on_b
+            .status(ctx_b.get_client_validation_context(), client_id_on_b)?
+            .verify_active()?;
         client_state_of_a_on_b.validate_proof_height(msg.proof_height_on_a)?;
 
         let client_cons_state_path_on_b = ClientConsensusStatePath::new(

ibc-core/ics04-channel/src/handler/chan_open_init.rs

@@ -123,13 +123,9 @@ where
     let client_id_on_a = conn_end_on_a.client_id();
     let client_state_of_b_on_a = ctx_a.client_state(client_id_on_a)?;
 
-    {
-        let status =
-            client_state_of_b_on_a.status(ctx_a.get_client_validation_context(), client_id_on_a)?;
-        if !status.is_active() {
-            return Err(ClientError::ClientNotActive { status }.into());
-        }
-    }
+    client_state_of_b_on_a
+        .status(ctx_a.get_client_validation_context(), client_id_on_a)?
+        .verify_active()?;
 
     let conn_version = conn_end_on_a.versions();
 

ibc-core/ics04-channel/src/handler/chan_open_try.rs

@@ -138,13 +138,10 @@ where
         let client_id_on_b = conn_end_on_b.client_id();
         let client_state_of_a_on_b = ctx_b.client_state(client_id_on_b)?;
 
-        {
-            let status = client_state_of_a_on_b
-                .status(ctx_b.get_client_validation_context(), client_id_on_b)?;
-            if !status.is_active() {
-                return Err(ClientError::ClientNotActive { status }.into());
-            }
-        }
+        client_state_of_a_on_b
+            .status(ctx_b.get_client_validation_context(), client_id_on_b)?
+            .verify_active()?;
+
         client_state_of_a_on_b.validate_proof_height(msg.proof_height_on_a)?;
 
         let client_cons_state_path_on_b = ClientConsensusStatePath::new(

ibc-core/ics04-channel/src/handler/recv_packet.rs

@@ -182,13 +182,10 @@ where
         let client_id_on_b = conn_end_on_b.client_id();
         let client_state_of_a_on_b = ctx_b.client_state(client_id_on_b)?;
 
-        {
-            let status = client_state_of_a_on_b
-                .status(ctx_b.get_client_validation_context(), client_id_on_b)?;
-            if !status.is_active() {
-                return Err(ClientError::ClientNotActive { status }.into());
-            }
-        }
+        client_state_of_a_on_b
+            .status(ctx_b.get_client_validation_context(), client_id_on_b)?
+            .verify_active()?;
+
         client_state_of_a_on_b.validate_proof_height(msg.proof_height_on_a)?;
 
         let client_cons_state_path_on_b = ClientConsensusStatePath::new(

ibc-core/ics04-channel/src/handler/send_packet.rs

@@ -54,13 +54,9 @@ pub fn send_packet_validate(
 
     let client_state_of_b_on_a = ctx_a.client_state(client_id_on_a)?;
 
-    {
-        let status =
-            client_state_of_b_on_a.status(ctx_a.get_client_validation_context(), client_id_on_a)?;
-        if !status.is_active() {
-            return Err(ClientError::ClientNotActive { status }.into());
-        }
-    }
+    client_state_of_b_on_a
+        .status(ctx_a.get_client_validation_context(), client_id_on_a)?
+        .verify_active()?;
 
     let latest_height_on_a = client_state_of_b_on_a.latest_height();
 

ibc-core/ics04-channel/src/handler/timeout.rs

@@ -189,13 +189,10 @@ where
         let client_id_on_a = conn_end_on_a.client_id();
         let client_state_of_b_on_a = ctx_a.client_state(client_id_on_a)?;
 
-        {
-            let status = client_state_of_b_on_a
-                .status(ctx_a.get_client_validation_context(), client_id_on_a)?;
-            if !status.is_active() {
-                return Err(ClientError::ClientNotActive { status }.into());
-            }
-        }
+        client_state_of_b_on_a
+            .status(ctx_a.get_client_validation_context(), client_id_on_a)?
+            .verify_active()?;
+
         client_state_of_b_on_a.validate_proof_height(msg.proof_height_on_b)?;
 
         // check that timeout height or timeout timestamp has passed on the other end

ibc-core/ics04-channel/src/handler/timeout_on_close.rs

@@ -68,13 +68,10 @@ where
         let client_id_on_a = conn_end_on_a.client_id();
         let client_state_of_b_on_a = ctx_a.client_state(client_id_on_a)?;
 
-        {
-            let status = client_state_of_b_on_a
-                .status(ctx_a.get_client_validation_context(), client_id_on_a)?;
-            if !status.is_active() {
-                return Err(ClientError::ClientNotActive { status }.into());
-            }
-        }
+        client_state_of_b_on_a
+            .status(ctx_a.get_client_validation_context(), client_id_on_a)?
+            .verify_active()?;
+
         client_state_of_b_on_a.validate_proof_height(msg.proof_height_on_b)?;
 
         let client_cons_state_path_on_a = ClientConsensusStatePath::new(