task: Add serialize impl for ApiError (#393)

* task: Add serialize impl for ApiError

- Adds the `serde::Serialize` derive macro to the `ApiError` type so
  that this error can be passed along the wire to clients for proxies

* Update async-openai/Cargo.toml

* Update async-openai/Cargo.toml

---------

Co-authored-by: Himanshu Neema <himanshun.iitkgp@gmail.com>

Author: tomharmon

async-openai/src/error.rs

@@ -1,5 +1,5 @@
 //! Errors originating from API calls, parsing responses, and reading-or-writing to the file system.
-use serde::Deserialize;
+use serde::{Deserialize, Serialize};
 
 #[derive(Debug, thiserror::Error)]
 pub enum OpenAIError {
@@ -28,7 +28,7 @@ pub enum OpenAIError {
 }
 
 /// OpenAI API returns error object on failure
-#[derive(Debug, Deserialize, Clone)]
+#[derive(Debug, Serialize, Deserialize, Clone)]
 pub struct ApiError {
     pub message: String,
     pub r#type: Option<String>,
@@ -62,9 +62,9 @@ impl std::fmt::Display for ApiError {
 }
 
 /// Wrapper to deserialize the error object nested in "error" JSON key
-#[derive(Debug, Deserialize)]
-pub(crate) struct WrappedError {
-    pub(crate) error: ApiError,
+#[derive(Debug, Deserialize, Serialize)]
+pub struct WrappedError {
+    pub error: ApiError,
 }
 
 pub(crate) fn map_deserialization_error(e: serde_json::Error, bytes: &[u8]) -> OpenAIError {

async-openai/src/lib.rs

@@ -103,7 +103,7 @@
 //! ```
 //! use async_openai::{Client, config::Config, config::OpenAIConfig};
 //! unsafe { std::env::set_var("OPENAI_API_KEY", "only for doc test") }
-//! 
+//!
 //! let openai_config = OpenAIConfig::default();
 //! // You can use `std::sync::Arc` to wrap the config as well
 //! let config = Box::new(openai_config) as Box<dyn Config>;