From f1cb14729ba56b154b9c918a8445ada512e0029f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rafael=20Fern=C3=A1ndez=20L=C3=B3pez?=
 <rfernandezlopez@suse.com>
Date: Thu, 9 Sep 2021 01:19:23 +0200
Subject: [PATCH] Implement debugging builtins

---
 crates/burrego/src/opa/builtins/debugging.rs | 16 ++++++++++++++++
 crates/burrego/src/opa/builtins/mod.rs       |  4 ++++
 2 files changed, 20 insertions(+)
 create mode 100644 crates/burrego/src/opa/builtins/debugging.rs

diff --git a/crates/burrego/src/opa/builtins/debugging.rs b/crates/burrego/src/opa/builtins/debugging.rs
new file mode 100644
index 00000000..06c00280
--- /dev/null
+++ b/crates/burrego/src/opa/builtins/debugging.rs
@@ -0,0 +1,16 @@
+use anyhow::{anyhow, Result};
+
+#[tracing::instrument(skip(args))]
+pub fn trace(args: &[serde_json::Value]) -> Result<serde_json::Value> {
+    if args.len() != 1 {
+        return Err(anyhow!("Wrong number of arguments given to trace"));
+    }
+
+    let message_str = args[0]
+        .as_str()
+        .ok_or_else(|| anyhow!("trace: 1st parameter is not a string"))?;
+
+    tracing::debug!("{}", message_str);
+
+    Ok(serde_json::Value::Null)
+}
diff --git a/crates/burrego/src/opa/builtins/mod.rs b/crates/burrego/src/opa/builtins/mod.rs
index 0c999edc..23290259 100644
--- a/crates/burrego/src/opa/builtins/mod.rs
+++ b/crates/burrego/src/opa/builtins/mod.rs
@@ -1,6 +1,7 @@
 use anyhow::Result;
 use std::collections::HashMap;
 
+pub mod debugging;
 pub mod encoding;
 pub mod regex;
 pub mod strings;
@@ -11,6 +12,9 @@ pub type BuiltinFunctionsMap =
 pub fn get_builtins() -> BuiltinFunctionsMap {
     let mut functions: BuiltinFunctionsMap = HashMap::new();
 
+    // debugging
+    functions.insert("trace", debugging::trace);
+
     // encoding
     functions.insert(
         "base64url.encode_no_pad",