Programmer Think

Last article Describes how to extend a new type of support in flag.This article describes how to use flag to implement subcommands. Overall, this is the core of this series. The first two articles are just padding. The first two articles are linked as follows: A quick way to parse flag packages from the Go command line New Extended Type for Go ...

Go language has a strong momentum of development, but there are also many disadvantages. Fortunately, there are many fans who provide numerous libraries, which show their advantages too well. They can use whatever they do, basically ignore the pointer, and the performance is good. Recently, there is a problem in using Chinese under windows. Th ...

This article, any image and yaml I use will send a link to the online disk for you to download and learn!Links: https://pan.baidu.com/s/1inmW... Password: 92uagithub: https://github.com/heyangguangYou can contact me directly if you have any questions: heyangev@cn.ibm.com Heapster is a collector that summarizes the data of C advisor on each Nod ...

Catalog Function definition Example of function Summary Function definition Function definitions are similar to variable definitions, func function_name(var1, var2, var3, ...) (return_type1, return_type1, ...) { //function body } Example of function package main import ( "fmt" "math" ...

A User and Company are defined. Users can contain multiple companies, as follows: type User struct { ID int `gorm:"TYPE:int(11);NOT NULL;PRIMARY_KEY;INDEX"` Name string `gorm:"TYPE: VARCHAR(255); DEFAULT:'';INDEX"` Companies []Company `gorm:"FOREIGNKEY:UserId;ASSOCIATION_FOREIGNKEY:ID"` Cr ...

Many command-line programs can output version information, commit, operating system and other information through the version parameter. Here is a method to print the version number of the command line program compiled by golang. Version information printed by docker: $ ~ docker version Client: Docker Engine - Community Version: 18.0 ...

1. Goroutine synchronization [data synchronization] Why goroutine synchronization is needed The concept of gorotine synchronization and several ways of synchronization 1.1 why goroutine synchronization is needed package main import ( "fmt" "sync" ) var A = 10 var wg = sync.WaitGroup{} func Add(){ defer wg.Don ...

golang_real.jpg Share beforeGorang network programming (5) middleware By learning to write two interceptors by ourselves, output log and simple permission verification. This is what we usually do in middleware. In fact, many times we don't need to do too much by ourselves. Do we still need to grow, bake and grind if we want t ...

Previous Introduces the code logic and flow chart of nsqd. This paper parses another module nsqlookupd in nsq, which is responsible for maintaining the topology information of nsqd nodes, and achieves the service registration and discovery of de-centralization. 1. nsqlookupd Execution Entry Execution entry files can be found in nsq/apps/nsqlook ...

Catalog The strings package implements simple functions for manipulating characters. func EqualFold Determine whether the two utf-8 encoding strings (unicode uppercase, lowercase, and title characters are regarded as the same) are the same. func EqualFold(s, t string) bool Example: func main() { str1 := "Golang" ...