more verbose sqlite errors

Author: carlsverre

lib/sqlsync-reducer/examples/guest.rs

@@ -35,11 +35,10 @@ async fn reducer(mutation: Vec<u8>) -> Result<(), ReducerError> {
     let result = query_future.await;
     log::info!("final query result: {:?}", result);
 
-    log::info!("testing errors");
     if let Err(err) = execute!("FAIL").await {
-        log::error!("error: {:?}", err);
+        log::info!("received expected error: {:?}", err);
     } else {
-        panic!("expected error");
+        panic!("failed to receive expected error");
     }
 
     log::info!("make sure we can resume queries after an error");

lib/sqlsync-reducer/examples/host.rs

@@ -65,7 +65,6 @@ fn main() -> anyhow::Result<()> {
                 }
                 Request::Exec { sql, params } => {
                     log::info!("received exec request: {} {:?}", sql, params);
-                    log::info!("the following error is EXPECTED");
                     if sql == "FAIL" {
                         let ptr = ffi.encode(
                             &mut store,

lib/sqlsync/src/reducer.rs

@@ -182,9 +182,12 @@ fn to_sqlite_value(v: ValueRef) -> SqliteValue {
 
 fn rusqlite_err_to_response_err(e: rusqlite::Error) -> ErrorResponse {
     match e {
-        rusqlite::Error::SqliteFailure(e, _) => ErrorResponse::SqliteError {
+        rusqlite::Error::SqliteFailure(e, extra) => ErrorResponse::SqliteError {
             code: e.extended_code,
-            message: format!("{}", e),
+            message: match extra {
+                Some(extra) => format!("{}: {}", e, extra),
+                None => format!("{}", e),
+            },
         },
         other => ErrorResponse::Unknown(format!("{}", other)),
     }