![]() ![]() The address parameter has the form host:port.This function returns the address of a UDP end point.If the IP field of raddr is nil or an unspecified IP address, the local system is assumed.įunc ResolveUDPAddr(network, address string) (*UDPAddr, error) raddr is the response address (client).If laddr is nil, a local address is automatically chosen. The laddr is the listening address (server).Used to specify the kind of client you will create.func DialUDP(network string, laddr, raddr *UDPAddr) (*UDPConn, error) The laddr parameter defines the server address and port number that the server will listen on.The network parameter must be a UDP network name.The address parameter defines the server address and port number that the server will listen on.įunc ListenUDP(network string, laddr *UDPAddr) (*UDPConn, error).The network parameter defines the type of network to use and accepts values tcp, tcp4 (IPv4-only), tcp6 (IPv6-only), unix (Unix sockets), or unixpacket. ![]() Typeįunc Listen(network, address string) (Listener, error) This means that you can use regular File I/O functions to send and receive data from a TCP/IP connection. To view all types and functions included in the net package, see Golang’s official documentation.Īll versions of net.Dial() and net.Listen() return data types that implement the io.Reader and io.Writer interfaces. Use the table below as a quick reference for some of the net package functions used throughout this guide. You will use this package to create TCP and UDP servers and clients in this guide. Go’s net package provides a portable interface for network I/O, including TCP/IP, UDP, domain name resolution, and Unix domain sockets. UDP is commonly used for online gaming, video chatting, and other real-time applications. When speed is more important than reliability, UDP is generally chosen over TCP. UDP does not provide error checking, correction or packet retransmission, which makes it very fast. UDP provides a simpler implementation of the transport layer protocol that, while less reliable than TCP, is much faster. Instead, IP works together with TCP to reliably deliver packets over a network. For this reason, the Internet Protocol does not guarantee a reliable delivery of packets over a network. This design favors a reduction in network complexity over reliability. The IP protocol adheres to the end-to-end principle, which places all network intelligence in the end nodes and not in the intermediary nodes. Some of the tasks TCP packets can be used for are establishing connections, transferring data, sending acknowledgements, and closing connections. If there is no proof of a packet’s delivery, TCP will resend the packet. TCP’s principal characteristic is that it is a reliable protocol by design. If you are not familiar with the sudo command, see the Users and Groups guide. Depending on the TCP/IP port number that you use when running the TCP and UDP servers, you may need to prefix commands with sudo. This guide is written for a non-root user. You can check your Go version by executing the following command: go version It is considered good practice to have the latest version of Go installed. This guide requires Go version 1.8 or higher. You can follow our guide How to Install Go on Ubuntu for installation steps. Install Go on your computer if it is not already installed. If you are not familiar with using Go packages, review the Getting Started with Go Packages guide. A concurrent TCP server that accepts incoming messages from several TCP clients and responds with the number of clients currently connected to it.The UDP server accepts incoming messages from a UDP client and responds with a random number. The TCP server accepts incoming messages from a TCP client and responds with the current date and time. Throughout this guide you will create the following: This guide is meant to provide instructional examples to help you become more familiar with the Go programming language. In this guide, you will use the net package, which is a part of Go’s standard library, to create TCP and UDP servers and clients. ![]() Go packages allow developers to organize and reuse Go code in a simple and maintainable manner. Many modern applications, including Docker, Kubernetes, and Terraform, are written in Go. Go is a compiled, statically typed programming language developed by Google. ![]()
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