From 38e1f7c4bae17776468f1e7c1b821d384f9d1340 Mon Sep 17 00:00:00 2001
From: Brooks Prumo <brooks@prumo.org>
Date: Thu, 2 Sep 2021 20:47:35 -0500
Subject: [PATCH] Add backwards compatibility support to
 get_highest_snapshot_slot() (#19591)

Co-authored-by: Michael Vines <mvines@gmail.com>
---
 client/src/rpc_client.rs | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/client/src/rpc_client.rs b/client/src/rpc_client.rs
index 112c49ab2c..98349fec88 100644
--- a/client/src/rpc_client.rs
+++ b/client/src/rpc_client.rs
@@ -1041,7 +1041,15 @@ impl RpcClient {
     /// # Ok::<(), ClientError>(())
     /// ```
     pub fn get_highest_snapshot_slot(&self) -> ClientResult<RpcSnapshotSlotInfo> {
-        self.send(RpcRequest::GetHighestSnapshotSlot, Value::Null)
+        if self.get_node_version()? < semver::Version::new(1, 8, 0) {
+            #[allow(deprecated)]
+            self.get_snapshot_slot().map(|full| RpcSnapshotSlotInfo {
+                full,
+                incremental: None,
+            })
+        } else {
+            self.send(RpcRequest::GetHighestSnapshotSlot, Value::Null)
+        }
     }
 
     #[deprecated(