go | 易学教程

How do I determine whether the program was built as 32 bit or 64 bit in Go?

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问题 The closest I can get is runtime.GOARCH , but that might also give arm , which could be either 32 or 64 bit. I only care how this program was built, not whether the OS also supports 64-bit executables. e.g. for ARM mode on an AArch64 CPU or 32-bit compat mode on an x86-64 CPU, I still want 32 because that's the mode this program is running in. Related: Detect OS x86 or x64, when compiled as x86 in GO is about detecting what the OS supports, e.g. for maybe running a differently-compiled

what is the best solutions to mysql connection timeout?

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问题 I am writing a small web app in Go, which uses mysql to store data. I got intermittent mysql error if the web sever didn't get any request after some amount of time(> 8 hours): [mysql] 2017/02/08 16:31:56 packets.go:33: unexpected EOF [mysql] 2017/02/08 16:31:56 packets.go:130: write tcp 127.0.0.1:49188->127.0.0.1:3306: write: broken pipe I found some related discussion on github(issue 529, issue 257 and issue 446). From what I understand, mysql db would close the connection if timeout is

Getting incoming TTL in GO

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问题 I'm struggling with a small project I am working on. I want to implement functionality in GO that allows me to set the IP header TTL on an outgoing UDP packet that I then send and view the received TTL on the other end. I have a tried using a number of connections provided by the 'net' library and have so far had no success (I can set the TTL but I can't read it). Can anyone suggest a way of sending and receiving UDP packets that provide access to the packet's TTL field? 回答1: Set TTL: var

bson.D vs bson.M for find queries

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问题 This specifc question is in relation to using mongodb with the golang package mongo-driver, but I would assume this applies across most interfaces with mongodb. When using Find to query some data from a collection, we can use both the bson.M- and bson.D-type to specify the filter for this find. As per the documentation bson.D should be used if the order of elements matters and bson.M should be used otherwise. D is an ordered representation of a BSON document. This type should be used when the

Shell Expansion (Command substitution) in Golang

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问题 Go has the support for variable expansion , for example: os.ExpandEnv("test- ${USER} ")` >> "test-MyName" But is there a way of expanding executables , as the way the shell behaves? Something like os.ExpandExecutable("test- $(date +%H:%M) ") >> "test-18:20" I cannot find an equivalent method for this, is there an elegant way of doing this instead of manually extracting the placeholders out, executing and then replacing them? 回答1: There's no built in function for this, but you can write a

Gorilla Mux Regex

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问题 I'm using the Mux package from the Golang Gorilla Toolkit for my routes. Consider the following routes: m.HandleFunc("/admin/install", installHandler).Methods("GET") m.HandleFunc("/admin/^((?!install).)*$", adminHandler).Methods("GET") m.HandleFunc("/admin", adminHandler).Methods("GET") The problem is with the regex of the middle route - it is not interpreted, so the route will not work! m.HandleFunc("/admin/{^((?!install).)*$}", adminHandler).Methods("GET") With the {} curly brackets doesn't

Explain go generate in this example

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问题 I'm having difficulties understanding go generate . I also find barely any posts dealing with go generate . please explain go generate in this following example: package main import ( "gopkg.in/mgo.v2" "gopkg.in/mgo.v2/bson" ) // --- Address type Address struct { Id bson.ObjectId `bson:"_id,omitempty"` AccountId string `bson:"account_id"` Name string `bson:"name"` StreetAddress string `bson:"streetaddress"` Town string `bson:"town"` Country string `bson:"country"` } // --- AddressHandler type

Pkg.go.dev新设计来了！！

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自启动pkg.go.dev以来，我们收到了很多有关设计和可用性的反馈。特别是在浏览网站时信息的组织方式使用户感到困惑。今天，我们很高兴分享一个重新设计的pkg.go.dev，我们希望它会更清晰，更有用。这篇博客文章重点介绍。有关详细信息，请参阅 Go问题41585 。所有路径的登陆页始终保持一致主要的变化是pkg.go.dev/ <path>页面已经围绕路径的概念进行了重组。路径表示模块特定版本中的目录。现在，无论该目录中包含什么内容，每个路径页面都将具有相同的布局，使体验始终一致且可预测。如果目录里面存在 README ，则路径页面将在会自动渲染。以前在概述选项卡仅在模块根目录下的 README才会显示。这个改动是为了将最重要的信息放在首位而进行的众多更改之一。文档导航文档部分现在显示索引以及sidenav。这使他们能够查看完整的程序包API，同时在浏览文档部分时具有上下文。左侧导航栏中还有一个新的跳转到输入框，用于搜索标识符。有关文档部分中的更改的详细信息，请参见 Go问题41587 。主页上的元数据现在，每个页面的顶部栏显示其他元数据，例如每个程序包的“引用”和“被引用”计数。还显示有关模块的最新次要和主要版本的信息。有关详细信息，请参见 Go问题41588 。视频演练上周，在 Google Open Source

Grafana Dashboard show/hide row based on variable value

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问题 So, I have a Grafana dashboard to show the logs of various services running inside a host. Now, I have different rows for different service because metrics and there titles are specific to the service - Such as for Apache Service, we have log metrics based on HTTP STATUS CODE, for Oracle Database Service, we have ORA-* distribution, connection partition /trend etc. Now, My question is simple that the Grafana dashboard supports repeat on rows and individual metrics. How can I use this feature

Kubernetes client go couldn't find module

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问题 I'm trying to connect to my local Kubernetes cluster hosted on minikube , here's the code for the same, now when I do go run minikube.go , it gives me an error saying: ../../../pkg/mod/k8s.io/client-go@v11.0.0+incompatible/kubernetes/scheme/register.go:26:2: module k8s.io/api@latest found (v0.19.0), but does not contain package k8s.io/api/auditregistration/v1alpha1`. Now, I tried to manually install the package using go get then I found out that this package does not exist. How can I make it