From a0303a34d428143f9a5ed1a6c7624a3c1ad2fe92 Mon Sep 17 00:00:00 2001
From: xiang <1984871009@qq.com>
Date: Tue, 13 Jun 2023 21:15:58 +0800
Subject: [PATCH] fix: eventstream

---
 model/chatdemo/index.ts | 12 +++++++-----
 utils/index.ts          | 13 ++++++++++---
 2 files changed, 17 insertions(+), 8 deletions(-)

diff --git a/model/chatdemo/index.ts b/model/chatdemo/index.ts
index 6cf3ea1..d45b512 100644
--- a/model/chatdemo/index.ts
+++ b/model/chatdemo/index.ts
@@ -3,7 +3,6 @@ import {AxiosInstance, AxiosRequestConfig, CreateAxiosDefaults} from "axios";
 import {CreateAxiosProxy} from "../../utils/proxyAgent";
 import es from "event-stream";
 import {ErrorData, Event, EventStream, MessageData, parseJSON} from "../../utils";
-import {randomUUID} from "crypto";
 import {v4} from "uuid";
 import moment from "moment";
 
@@ -50,10 +49,10 @@ export class ChatDemo extends Chat {
                     case Event.done:
                         break;
                     case Event.message:
-                        result.content += (data as MessageData).content
+                        result.content += (data as MessageData).content || '';
                         break;
                     case Event.error:
-                        result.error = (data as ErrorData).error
+                        result.error = (data as ErrorData).error;
                         break;
                 }
             }, () => {
@@ -76,7 +75,6 @@ export class ChatDemo extends Chat {
             res.data.pipe(es.split(/\r?\n\r?\n/)).pipe(es.map(async (chunk: any, cb: any) => {
                 const dataStr = chunk.replace('data: ', '');
                 if (!dataStr) {
-                    stream.end();
                     return;
                 }
                 const data = parseJSON(dataStr, {} as any);
@@ -85,7 +83,11 @@ export class ChatDemo extends Chat {
                     stream.end();
                     return;
                 }
-                const [{delta: {content = ""}}] = data.choices;
+                const [{delta: {content = ""}, finish_reason}] = data.choices;
+                if (finish_reason === 'stop') {
+                    stream.end();
+                    return;
+                }
                 stream.write(Event.message, {content});
             }))
         } catch (e: any) {
diff --git a/utils/index.ts b/utils/index.ts
index d66df8a..dabcdbc 100644
--- a/utils/index.ts
+++ b/utils/index.ts
@@ -38,7 +38,7 @@ export function parseJSON<T>(str: string, defaultObj: T): T {
     try {
         return JSON.parse(str)
     } catch (e) {
-        console.error(str, e);
+        console.log(str);
         return defaultObj;
     }
 }
@@ -90,6 +90,10 @@ export type DataCB<T extends Event> = (event: T, data: Data<T>) => void
 export class EventStream {
     private readonly pt: PassThrough = new PassThrough();
 
+    constructor() {
+        this.pt.setEncoding('utf-8');
+    }
+
     write<T extends Event>(event: T, data: Data<T>) {
         this.pt.write(`event: ${event}\n`, 'utf-8');
         this.pt.write(`data: ${JSON.stringify(data)}\n\n`, 'utf-8');
@@ -105,8 +109,11 @@ export class EventStream {
 
     read(dataCB: DataCB<Event>, closeCB: () => void) {
         this.pt.setEncoding('utf-8');
-        this.pt.pipe(es.split('\n\n').pipe(es.map(async (chunk: any, cb: any) => {
+        this.pt.pipe(es.split('\n\n')).pipe(es.map(async (chunk: any, cb: any) => {
             const res = chunk.toString()
+            if (!res) {
+                return;
+            }
             const [eventStr, dataStr] = res.split('\n');
             const event: Event = eventStr.replace('event: ', '');
             if (!(event in Event)) {
@@ -115,7 +122,7 @@ export class EventStream {
             }
             const data = parseJSON(dataStr.replace('data: ', ''), {} as Data<Event>);
             return dataCB(event, data);
-        })))
+        }))
         this.pt.on("close", closeCB)
     }
 }