f Use futures' Mutex rather than tokio's

lightning-transaction-sync/Cargo.toml

@@ -15,13 +15,13 @@ rustdoc-args = ["--cfg", "docsrs"]
 
 [features]
 default = ["esplora-blocking"]
-esplora-async = ["async-interface", "esplora-client/async", "tokio"]
+esplora-async = ["async-interface", "esplora-client/async", "futures"]
 esplora-blocking = ["esplora-client/blocking"]
 async-interface = []
 
 [dependencies]
 lightning = { version = "0.0.112", path = "../lightning" }
 bitcoin = "0.29.0"
 bdk-macros = "0.6"
-tokio = { version = "1.0", default-features = false, features = [], optional = true }
+futures = { version = "0.3", optional = true }
 esplora-client = { git = "https://github.com/tnull/rust-esplora-client", branch = "2022-10-get-merkle-block", default-features = false, optional = true }

lightning-transaction-sync/src/esplora.rs

@@ -41,7 +41,7 @@ where
 	#[cfg(not(feature = "async-interface"))]
 	last_sync_hash: std::sync::Mutex<Option<BlockHash>>,
 	#[cfg(feature = "async-interface")]
-	last_sync_hash: tokio::sync::Mutex<Option<BlockHash>>,
+	last_sync_hash: futures::lock::Mutex<Option<BlockHash>>,
 	#[cfg(not(feature = "async-interface"))]
 	client: BlockingClient,
 	#[cfg(feature = "async-interface")]
@@ -139,7 +139,7 @@ where
 		#[cfg(not(feature = "async-interface"))]
 		let last_sync_hash = Mutex::new(None);
 		#[cfg(feature = "async-interface")]
-		let last_sync_hash = tokio::sync::Mutex::new(None);
+		let last_sync_hash = futures::lock::Mutex::new(None);
 		let builder = Builder::new(&server_url);
 		#[cfg(not(feature = "async-interface"))]
 		let client = builder.build_blocking().unwrap();