first commit of jspg extension

src/lib.rs

@@ -0,0 +1,125 @@
+use pgrx::*;
+use jsonschema::{JSONSchema, Draft};
+use serde_json::{json, Value};
+use std::collections::HashMap;
+use std::sync::RwLock;
+use lazy_static::lazy_static;
+
+pg_module_magic!();
+
+// Global, thread-safe schema cache
+lazy_static! {
+    static ref SCHEMA_CACHE: RwLock<HashMap<String, JSONSchema>> = RwLock::new(HashMap::new());
+}
+
+// Cache a schema explicitly with a provided ID
+#[pg_extern(immutable, strict, parallel_safe)]
+fn cache_schema(schema_id: &str, schema: JsonB) -> bool {
+    match JSONSchema::options()
+        .with_draft(Draft::Draft7)
+        .should_validate_formats(true)
+        .compile(&schema.0)
+    {
+        Ok(compiled) => {
+            SCHEMA_CACHE.write().unwrap().insert(schema_id.to_string(), compiled);
+            true
+        },
+        Err(e) => {
+            notice!("Failed to cache schema '{}': {}", schema_id, e);
+            false
+        }
+    }
+}
+
+// Check if a schema is cached
+#[pg_extern(immutable, strict, parallel_safe)]
+fn schema_cached(schema_id: &str) -> bool {
+    SCHEMA_CACHE.read().unwrap().contains_key(schema_id)
+}
+
+// Validate JSONB instance against a cached schema by ID
+#[pg_extern(immutable, strict, parallel_safe)]
+fn validate_schema(schema_id: &str, instance: JsonB) -> JsonB {
+    let cache = SCHEMA_CACHE.read().unwrap();
+    let compiled_schema = match cache.get(schema_id) {
+        Some(schema) => schema,
+        None => {
+            return JsonB(json!({
+                "valid": false,
+                "errors": [format!("Schema ID '{}' not cached", schema_id)]
+            }));
+        }
+    };
+
+    if compiled_schema.is_valid(&instance.0) {
+        JsonB(json!({ "valid": true }))
+    } else {
+        let errors: Vec<String> = compiled_schema
+            .iter_errors(&instance.0)
+            .map(|e| e.to_string())
+            .collect();
+
+        JsonB(json!({ "valid": false, "errors": errors }))
+    }
+}
+
+// Clear the entire schema cache explicitly
+#[pg_extern(immutable, parallel_safe)]
+fn clear_schema_cache() -> bool {
+    SCHEMA_CACHE.write().unwrap().clear();
+    true
+}
+
+#[pg_schema]
+#[cfg(any(test, feature = "pg_test"))]
+mod tests {
+    use pgrx::*;
+    use serde_json::json;
+
+    #[pg_test]
+    fn test_cache_and_validate_schema() {
+        assert!(crate::cache_schema("test_schema", JsonB(json!({ "type": "object" }))));
+        assert!(crate::schema_cached("test_schema"));
+
+        let result_valid = crate::validate_schema("test_schema", JsonB(json!({ "foo": "bar" })));
+        assert_eq!(result_valid.0["valid"], true);
+
+        let result_invalid = crate::validate_schema("test_schema", JsonB(json!(42)));
+        assert_eq!(result_invalid.0["valid"], false);
+        assert!(result_invalid.0["errors"][0].as_str().unwrap().contains("not of type"));
+    }
+
+    #[pg_test]
+    fn test_schema_not_cached() {
+        let result = crate::validate_schema("unknown_schema", JsonB(json!({})));
+        assert_eq!(result.0["valid"], false);
+        assert!(result.0["errors"][0].as_str().unwrap().contains("not cached"));
+    }
+
+    #[pg_test]
+    fn test_clear_schema_cache() {
+        crate::cache_schema("clear_test", JsonB(json!({ "type": "object" })));
+        assert!(crate::schema_cached("clear_test"));
+
+        crate::clear_schema_cache();
+        assert!(!crate::schema_cached("clear_test"));
+    }
+
+    #[pg_test]
+    fn test_invalid_schema_cache() {
+        let result = crate::cache_schema("bad_schema", JsonB(json!({ "type": "unknown_type" })));
+        assert!(!result);
+        assert!(!crate::schema_cached("bad_schema"));
+    }
+}
+
+#[cfg(test)]
+pub mod pg_test {
+    pub fn setup(_options: Vec<&str>) {
+        // Initialization if needed
+    }
+
+    pub fn postgresql_conf_options() -> Vec<&'static str> {
+        vec![]
+    }
+}