add BaseConfig and new Config

Enabling extra configs that can be opted in, which may be needed for LLM services other than OpenAI

Author: ifsheldon

async-openai/src/config.rs

@@ -12,9 +12,7 @@ pub const OPENAI_ORGANIZATION_HEADER: &str = "OpenAI-Organization";
 /// Calls to the Assistants API require that you pass a Beta header
 pub const OPENAI_BETA_HEADER: &str = "OpenAI-Beta";
 
-/// [crate::Client] relies on this for every API call on OpenAI
-/// or Azure OpenAI service
-pub trait Config: 'static + Debug + Send + Sync {
+pub trait BaseConfig: 'static + Debug + Send + Sync {
     fn headers(&self) -> HeaderMap;
     fn url(&self, path: &str) -> String;
     fn query(&self) -> Vec<(&str, &str)>;
@@ -24,6 +22,18 @@ pub trait Config: 'static + Debug + Send + Sync {
     fn api_key(&self) -> &Secret<String>;
 }
 
+/// [crate::Client] relies on this for every API call on OpenAI
+/// or Azure OpenAI service
+pub trait Config<Extra = ()>: BaseConfig {
+    fn extra_configs(&self) -> &Extra;
+}
+
+impl<T: BaseConfig> Config<()> for T {
+    fn extra_configs(&self) -> &() {
+        &()
+    }
+}
+
 /// Configuration for OpenAI API
 #[derive(Clone, Debug, Deserialize)]
 #[serde(default)]
@@ -74,7 +84,7 @@ impl OpenAIConfig {
     }
 }
 
-impl Config for OpenAIConfig {
+impl BaseConfig for OpenAIConfig {
     fn headers(&self) -> HeaderMap {
         let mut headers = HeaderMap::new();
         if !self.org_id.is_empty() {
@@ -167,7 +177,7 @@ impl AzureConfig {
     }
 }
 
-impl Config for AzureConfig {
+impl BaseConfig for AzureConfig {
     fn headers(&self) -> HeaderMap {
         let mut headers = HeaderMap::new();