Golang implements Douyu live broadcast barrage acquisition and analysis

Douyu Live is one of the largest game live broadcast platforms in China. Millions of users watch game live broadcasts or communicate online every day. In these live broadcast rooms, barrage has become an important part of interaction and entertainment. Therefore, in order to better understand the characteristics of Douyu live broadcast barrages, this article will use golang to obtain and analyze Douyu live broadcast barrages.

1. Introduction to the Douyu Barrage Protocol

The Douyu Barrage Protocol is a protocol for communication between the client and the server in Douyu live broadcast. It can be used through the official API interface. Get barrage data.

These data have been formatted and encoded to a certain extent, and we need to decode and process them at work. The following is an example:

type Message struct {
    Length int    // 消息长度
    Type   int    // 消息类型
    Data   string // 消息内容
    Xor    byte   // 异或校验码
}

This is the original information structure passed by the relay server, which contains the message length, message type, message content and XOR check code. We need to decode and process it to get useful information such as sender, level, etc.

2. Detailed explanation of the Douyu barrage protocol

The Douyu barrage protocol is mainly divided into three parts:

1. Handshake part

Before connecting to the barrage server, we need to send a handshake request, the rules are as follows:

数据格式：消息长度 + 消息类型 + 加密字段 + 固定值1 + 固定值2

Among them, the message length is a fixed value, the length of the encrypted field is 8 bytes, and the message type is a fixed value. , the encryption field is a random string used for encryption.

2. Login part

After the handshake is successful, we need to log in in order to obtain more permissions:

数据格式：消息长度 + 消息类型 + 加密字段 + 用户名 + 加密后的密码 + 客户端类型 + 固定值

After logging in, we obtain Permission to receive bullet comments in a specific room. At the same time, the received barrage will be sent to us in Douyu’s specific format.

3. Receive data part

We need to send heartbeat packets to the server at a certain frequency to maintain the connection. At the same time, the server will regularly send us barrage information.

The format of the barrage information is as follows:

数据格式：长度 + 固定值 + 固定值 + 内容 + 0

Among them, the length represents the length of the following data, and the content is the unique encoding of the barrage. The code contains the sender's name, level and the specific content of the barrage. We need to decode these codes to get useful information.

3. Golang implements Douyu barrage acquisition

Based on the above, we can implement the specific process of golang achieving Douyu barrage acquisition.

First, we need to use golang to process the socket connection. It is not possible to use the "golang.org/x/net/websocket" package directly because Douyu uses a binary message format encapsulated based on the TCP data protocol. At this time, we can use the "goim/libs/protocol" package to process data. This package has helped us complete the definition of the data structure and part of the decoding work, which can reduce our pressure.

Next, after getting the message, we need to decode the message. This process involves the protocol rules of Douyu Barrage and the analysis of coding.

Finally, we can use golang's websocket protocol to stream the decoded data to the front end for display.

During the implementation process, we can use golang's coroutine features to improve performance, and use buffer queue and other technologies to handle high concurrency situations.

In short, using golang to obtain and analyze Douyu live broadcast barrages can help us understand the Douyu barrage protocol more deeply and apply it in a wider range of fields.

The above is the detailed content of Golang implements Douyu live broadcast barrage acquisition and analysis. For more information, please follow other related articles on the PHP Chinese website!