solana-ibc: use solana height and timestamp for cf-guest host metadata

solana/solana-ibc/programs/solana-ibc/Cargo.toml

@@ -17,6 +17,7 @@ mocks = ["ibc-testkit"]
 no-entrypoint = []
 no-idl = []
 no-log-ix-name = []
+witness = []
 
 [dependencies]
 anchor-lang.workspace = true

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

@@ -1,15 +1,15 @@
 use std::str::FromStr;
 use std::time::Duration;
 
-use anchor_lang::prelude::Pubkey;
+use anchor_lang::prelude::{Pubkey, SolanaSysvar};
 use lib::hash::CryptoHash;
+use spl_token::solana_program::clock::Clock;
 
 use crate::client_state::AnyClientState;
 use crate::consensus_state::AnyConsensusState;
 use crate::ibc::{self, ConsensusState};
 use crate::storage::{self, IbcStorage};
 
-
 type Result<T = (), E = ibc::ContextError> = core::result::Result<T, E>;
 
 impl ibc::ValidationContext for IbcStorage<'_, '_> {
@@ -22,7 +22,12 @@ impl ibc::ValidationContext for IbcStorage<'_, '_> {
         &self,
         client_id: &ibc::ClientId,
     ) -> Result<Self::AnyClientState> {
-        Ok(self.borrow().private.client(client_id)?.client_state.get()?)
+        self.borrow()
+            .private
+            .client(client_id)?
+            .client_state
+            .get()
+            .map_err(Into::into)
     }
 
     fn decode_client_state(
@@ -43,13 +48,27 @@ impl ibc::ValidationContext for IbcStorage<'_, '_> {
     }
 
     fn host_height(&self) -> Result<ibc::Height> {
-        let height = u64::from(self.borrow().chain.head()?.block_height);
-        let height = ibc::Height::new(1, height)?;
-        Ok(height)
+        let height = if cfg!(feature = "witness") {
+            Clock::get()
+                .map_err(|e| ibc::ClientError::ClientSpecific {
+                    description: e.to_string(),
+                })?
+                .slot
+        } else {
+            u64::from(self.borrow().chain.head()?.block_height)
+        };
+        Ok(ibc::Height::new(1, height)?)
     }
 
     fn host_timestamp(&self) -> Result<ibc::Timestamp> {
-        let timestamp = self.borrow().chain.head()?.timestamp_ns.get();
+        let timestamp = if cfg!(feature = "witness") {
+            let clock = Clock::get().map_err(|e| {
+                ibc::ClientError::ClientSpecific { description: e.to_string() }
+            })?;
+            clock.unix_timestamp as u64 * 10u64.pow(9)
+        } else {
+            self.borrow().chain.head()?.timestamp_ns.get()
+        };
         ibc::Timestamp::from_nanoseconds(timestamp).map_err(|err| {
             ibc::ClientError::Other { description: err.to_string() }.into()
         })
@@ -296,7 +315,6 @@ impl IbcStorage<'_, '_> {
     }
 }
 
-
 impl ibc::ClientValidationContext for IbcStorage<'_, '_> {
     fn update_meta(
         &self,