react native使用react-native-sse接收聊天数据

1. 安装依赖

npx expo install react-native-sse

react-native-sse Github地址

2. 引入

import EventSource from "react-native-sse";

3. 创建连接与监听器

import EventSource from "react-native-sse";
 
const es = new EventSource("https://your-sse-server.com/.well-known/mercure");
 
es.addEventListener("open", (event) => {
  console.log("Open SSE connection.");
});
 
es.addEventListener("message", (event) => {
  console.log("New message event:", event.data);
});
 
es.addEventListener("error", (event) => {
  if (event.type === "error") {
    console.error("Connection error:", event.message);
  } else if (event.type === "exception") {
    console.error("Error:", event.message, event.error);
  }
});
 
es.addEventListener("close", (event) => {
  console.log("Close SSE connection.");
});

4. 传参以及其他配置

new EventSource(url: string | URL, options?: EventSourceOptions);

const options: EventSourceOptions = {
  method: 'GET', // 请求方法。默认值: GET
  timeout: 0, // 在没有任何活动的情况下，连接超时的时间（毫秒）。默认值: 0（无超时）
  timeoutBeforeConnection: 500, // 在建立初始连接之前等待的时间（毫秒）。默认值: 500
  withCredentials: false, // 在跨站点的Access-Control请求中包含凭据。默认值: false
  headers: {}, // 请求头信息。默认值: {}
  body: undefined, // 在连接时发送的请求体。默认值: undefined
  debug: false, // 显示用于调试目的的 console.debug 消息。默认值: false
  pollingInterval: 5000, // 重连之间的时间间隔（毫秒）。如果设置为 0，则禁用重连。默认值: 5000
  lineEndingCharacter: null // 用于表示接收数据中行结尾的字符。常见值：'\n' 表示 LF（Unix/Linux），'\r\n' 表示 CRLF（Windows），'\r' 表示 CR（旧版Mac）。默认值: null（从事件中自动检测）
}

5. 完整示例

点击查看代码

import { useEffect, useState } from "react";
import { Text, View } from "react-native";
import EventSource from "react-native-sse";
 
const OpenAIToken = '[Your OpenAI token]';
 
export default function App() {
  const [text, setText] = useState<string>("Loading...");
 
  useEffect(() => {
    const es = new EventSource(
      "https://api.openai.com/v1/chat/completions",
      {
        headers: {
          "Content-Type": "application/json",
          Authorization: `Bearer ${OpenAIToken}`,
        },
        method: "POST",
        // Remember to read the OpenAI API documentation to set the correct body
        body: JSON.stringify({
          model: "gpt-3.5-turbo-0125",
          messages: [
            {
              role: "system",
              content: "You are a helpful assistant.",
            },
            {
              role: "user",
              content: "What is the meaning of life?",
            },
          ],
          max_tokens: 600,
          n: 1,
          temperature: 0.7,
          stream: true,
        }),
        pollingInterval: 0, // Remember to set pollingInterval to 0 to disable reconnections
      }
    );
 
    es.addEventListener("open", () => {
      setText("");
    });
 
    es.addEventListener("message", (event) => {
      if (event.data !== "[DONE]") {
        const data = JSON.parse(event.data);
 
        if (data.choices[0].delta.content !== undefined) {
          setText((text) => text + data.choices[0].delta.content);
        }
      }
    });
 
    return () => {
      es.removeAllEventListeners();
      es.close();
    };
  }, []);
 
  return (
    <View>
      <Text>{text}</Text>
    </View>
  );
}