use solana height and timestamp for cf-guest host metdata

solana/solana-ibc/programs/solana-ibc/src/client_state.rs

@@ -1,5 +1,6 @@
 use anchor_lang::prelude::borsh;
 use anchor_lang::prelude::borsh::maybestd::io;
+use spl_token::solana_program::sysvar::Sysvar;
 
 use crate::consensus_state::AnyConsensusState;
 use crate::ibc;
@@ -236,14 +237,20 @@ impl cf_guest::CommonContext<sigverify::ed25519::PubKey>
     type AnyConsensusState = AnyConsensusState;
 
     fn host_metadata(&self) -> Result<(ibc::Timestamp, ibc::Height)> {
-        let timestamp = self.borrow().chain.head()?.timestamp_ns.get();
-        let timestamp =
-            ibc::Timestamp::from_nanoseconds(timestamp).map_err(|err| {
-                ibc::ClientError::Other { description: err.to_string() }
+        let clock = anchor_lang::solana_program::sysvar::clock::Clock::get()
+            .map_err(|e| ibc::ClientError::ClientSpecific {
+                description: e.to_string(),
             })?;
 
-        let height = u64::from(self.borrow().chain.head()?.block_height);
-        let height = ibc::Height::new(1, height)?;
+        let slot = clock.slot;
+        let timestamp_sec = clock.unix_timestamp as u64;
+
+        let timestamp =
+            ibc::Timestamp::from_nanoseconds(timestamp_sec * 10u64.pow(9))
+                .map_err(|e| ibc::ClientError::ClientSpecific {
+                    description: e.to_string(),
+                })?;
+        let height = ibc::Height::new(1, slot)?;
 
         Ok((timestamp, height))
     }