feat: Relax trait bound requirements of creating and spawning signers

libsigner/src/runloop.rs

@@ -189,13 +189,7 @@ pub fn set_runloop_signal_handler<ST: EventStopSignaler + Send + 'static>(mut st
     }).expect("FATAL: failed to set signal handler");
 }
 
-impl<
-        CMD: Send + 'static,
-        R: Send + 'static,
-        SL: SignerRunLoop<R, CMD> + Send + Sync + 'static,
-        EV: EventReceiver + Send + 'static,
-    > Signer<CMD, R, SL, EV>
-{
+impl<CMD, R, SL, EV> Signer<CMD, R, SL, EV> {
     /// Create a new signer with the given runloop and event receiver.
     pub fn new(
         runloop: SL,
@@ -210,7 +204,15 @@ impl<
             result_sender: Some(result_sender),
         }
     }
+}
 
+impl<
+        CMD: Send + 'static,
+        R: Send + 'static,
+        SL: SignerRunLoop<R, CMD> + Send + 'static,
+        EV: EventReceiver + Send + 'static,
+    > Signer<CMD, R, SL, EV>
+{
     /// This is a helper function to spawn both the runloop and event receiver in their own
     /// threads.  Advanced signers may not need this method, and instead opt to run the receiver
     /// and runloop directly.  However, this method is present to help signer developers to get

stacks-signer/src/signerdb.rs

@@ -33,8 +33,7 @@ pub struct SignerDb {
     /// The SQLite database path
     pub db_path: Option<PathBuf>,
     // /// Connection to the DB
-    // /// TODO: Figure out how to manage this connection
-    // connection: Option<Connection>,
+    connection: Option<Connection>,
 }
 
 const CREATE_BLOCKS_TABLE: &'static str = "
@@ -50,6 +49,7 @@ impl SignerDb {
     pub fn new(db_path: &Option<PathBuf>) -> Result<SignerDb, DBError> {
         let signer_db = SignerDb {
             db_path: db_path.clone(),
+            connection: None,
         };
         let mut connection = signer_db.get_connection()?;
         connection.pragma_update(None, "journal_mode", &"WAL".to_sql().unwrap())?;
@@ -63,6 +63,7 @@ impl SignerDb {
         tx.commit().expect("Unable to commit tx");
         Ok(SignerDb {
             db_path: db_path.clone(),
+            connection: None,
         })
     }
 
@@ -148,6 +149,7 @@ impl SignerDb {
     pub fn memory_db() -> SignerDb {
         SignerDb {
             db_path: Some(PathBuf::from(":memory:")),
+            connection: None,
         }
     }