From c72f00a984e0f53d842b0b378a7a9f19580042f9 Mon Sep 17 00:00:00 2001
From: Web3 Philosopher <seun@polytope.technology>
Date: Thu, 27 Jul 2023 13:22:09 +0100
Subject: [PATCH] check for duplicate consensus state ids (#66)

* check for duplicate consensus state ids

* clippy
---
 ismp/src/handlers/consensus.rs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/ismp/src/handlers/consensus.rs b/ismp/src/handlers/consensus.rs
index d0797ea..8694d20 100644
--- a/ismp/src/handlers/consensus.rs
+++ b/ismp/src/handlers/consensus.rs
@@ -115,6 +115,10 @@ where
     // check that we have an implementation of this client
     host.consensus_client(message.consensus_client_id)?;
 
+    if host.consensus_client_id(message.consensus_state_id).is_some() {
+        Err(Error::DuplicateConsensusStateId { consensus_state_id: message.consensus_state_id })?
+    }
+
     // Store the initial state for the consensus client
     host.store_consensus_state(message.consensus_state_id, message.consensus_state)?;
     host.store_unbonding_period(message.consensus_state_id, message.unbonding_period)?;