From add107bee28fe4e3c18610fbafd6ec777d31525f Mon Sep 17 00:00:00 2001
From: Boyu Yang <yangby@cryptape.com>
Date: Wed, 20 Mar 2024 11:34:10 +0800
Subject: [PATCH] fix: empty params shouldn't represent as null

---
 src/components/bitcoin_client.rs | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/components/bitcoin_client.rs b/src/components/bitcoin_client.rs
index 6758bf2..0fb2da3 100644
--- a/src/components/bitcoin_client.rs
+++ b/src/components/bitcoin_client.rs
@@ -30,14 +30,19 @@ impl Clone for BitcoinClient {
     }
 }
 
+#[derive(Serialize, Clone, Copy)]
+struct ZeroElemTuple();
+
 // ### Warning
 //
 // If parameters contain only one parameter:
 // - `serde_json::to_value(($($arg,)+))`
 // - `serde_json::to_value(($($arg),+))`
 // are different.
+//
+// Ref: https://github.com/serde-rs/serde/issues/1309
 macro_rules! serialize_parameters {
-    () => ( serde_json::Value::Null );
+    () => ( serde_json::to_value(ZeroElemTuple())?);
     ($($arg:ident),+) => ( serde_json::to_value(($($arg,)+))?)
 }