From 98079c9d77f9d98f9623a6f348b29fcfbfaadac6 Mon Sep 17 00:00:00 2001
From: Deirdre Connolly <deirdre@zfnd.org>
Date: Thu, 14 Nov 2019 17:14:12 -0500
Subject: [PATCH] Support Mempool message

This does not yet push requests into services that actually respond with transaction
hashes in our node's mempool, which doesn't exist yet.

Pertains to #26
---
 zebra-network/src/protocol/codec.rs   | 4 ++--
 zebra-network/src/protocol/message.rs | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/zebra-network/src/protocol/codec.rs b/zebra-network/src/protocol/codec.rs
index aebb2646..52f98d5d 100644
--- a/zebra-network/src/protocol/codec.rs
+++ b/zebra-network/src/protocol/codec.rs
@@ -258,7 +258,7 @@ impl Codec {
                 writer.write_u32::<LittleEndian>(version.0)?;
                 transaction.zcash_serialize(&mut writer)?
             }
-            // Mempool => {}
+            Mempool => { /* Empty payload -- no-op */ }
             // FilterLoad => {}
             // FilterAdd => {}
             // FilterClear => {}
@@ -557,7 +557,7 @@ impl Codec {
     }
 
     fn read_mempool<R: Read>(&self, mut _reader: R) -> Result<Message, Error> {
-        return Err(Error::Parse("mempool messages are not implemented"));
+        Ok(Message::Mempool)
     }
 
     fn read_filterload<R: Read>(&self, mut _reader: R) -> Result<Message, Error> {
diff --git a/zebra-network/src/protocol/message.rs b/zebra-network/src/protocol/message.rs
index 7c9bde4a..a391e04d 100644
--- a/zebra-network/src/protocol/message.rs
+++ b/zebra-network/src/protocol/message.rs
@@ -272,7 +272,7 @@ pub enum Message {
     ///
     /// [Bitcoin reference](https://en.bitcoin.it/wiki/Protocol_documentation#mempool)
     /// [BIP35]: https://github.com/bitcoin/bips/blob/master/bip-0035.mediawiki
-    Mempool {/* XXX add fields */},
+    Mempool,
 
     /// A `filterload` message.
     ///