1 files changed, 41 insertions, 0 deletions
diff --git a/third_party/rust/jsparagus-json-log/src/lib.rs b/third_party/rust/jsparagus-json-log/src/lib.rs
new file mode 100644
index 0000000000..ed818566e5
--- /dev/null
+++ b/third_party/rust/jsparagus-json-log/src/lib.rs
@@ -0,0 +1,41 @@
+//! Provides a debug/trace output with json format.
+//! This is disabled by default, and can be enabled by "logging" feature.
+
+#[cfg(feature = "logging")]
+pub use log::{debug, trace};
+#[cfg(feature = "logging")]
+pub use serde_json::json;
+
+#[cfg(not(feature = "logging"))]
+#[macro_export]
+macro_rules! json_debug {
+    ($($t:tt)*) => {};
+}
+
+#[cfg(feature = "logging")]
+#[macro_export(local_inner_macros)]
+macro_rules! json_debug {
+    ($($t:tt)*) => {
+        debug!(
+            "{}",
+            json!($($t)*)
+        );
+    };
+}
+
+#[cfg(not(feature = "logging"))]
+#[macro_export]
+macro_rules! json_trace {
+    ($($t:tt)*) => {};
+}
+
+#[cfg(feature = "logging")]
+#[macro_export(local_inner_macros)]
+macro_rules! json_trace {
+    ($($t:tt)*) => {
+        trace!(
+            "{}",
+            json!($($t)*)
+        );
+    };
+}