Add chat gpt api

src/v1/chat_completion.rs

@@ -0,0 +1,43 @@
+use serde::{Deserialize, Serialize};
+
+use crate::v1::common;
+
+pub const GPT3_5_TURBO: &str = "gpt-3.5-turbo";
+pub const GPT3_5_TURBO_0301: &str = "gpt-3.5-turbo-0301";
+
+#[derive(Debug, Serialize)]
+pub struct ChatCompletionRequest {
+    pub model: String,
+    pub messages: Vec<ChatCompletionMessage>,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+#[allow(non_camel_case_types)]
+pub enum MessageRole {
+    user,
+    system,
+    assistant,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct ChatCompletionMessage {
+    pub role: MessageRole,
+    pub content: String,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct ChatCompletionChoice {
+    pub index: i64,
+    pub message: ChatCompletionMessage,
+    pub finish_reason: String,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct ChatCompletionResponse {
+    pub id: String,
+    pub object: String,
+    pub created: i64,
+    pub model: String,
+    pub choices: Vec<ChatCompletionChoice>,
+    pub usage: common::Usage,
+}