Method decode

guardrail_ffi/src/lib.rs:270–304

Decode payload (rehydrate PII).

(&self, payload: serde_json::Value, context: DecodeContext)

    /// Decode payload (rehydrate PII).
    pub fn decode(&self, payload: serde_json::Value, context: DecodeContext) -> DecodeResult {
        let default_result = DecodeResult {
            payload: payload.clone(),
            rules_applied_count: 0,
            rule_names: Vec::new(),
            policy_name: String::new(),
        };
        if self.handle.is_null() {
            return default_result;
        }
        let json = match serde_json::to_string(&payload) {
            Ok(s) => s,
            Err(_) => return default_result,
        };
        let c_str = match CString::new(json.as_bytes()) {
            Ok(c) => c,
            Err(_) => return default_result,
        };
        let ctx = match context {
            DecodeContext::ToolBoundary => CONTEXT_TOOL_BOUNDARY,
            DecodeContext::LlmResponse => CONTEXT_LLM_RESPONSE,
            DecodeContext::ManualCall => CONTEXT_MANUAL_CALL,
        };
        let out =
            unsafe { guardrail_decode(self.handle, c_str.as_ptr(), c_str.as_bytes().len(), ctx) };
        if out.is_null() {
            return default_result;
        }
        let out_slice = unsafe { CStr::from_ptr(out).to_bytes() };
        let out_str = String::from_utf8_lossy(out_slice).into_owned();
        unsafe { guardrail_free(out) };
        parse_decode_result(&out_str)
            .or_else(|| parse_decode_result_legacy(&out_str))
            .unwrap_or(default_result)
    }
}

/// Legacy FFI return: raw encoded payload as JSON (old guardrail_encode returned Value serialized).