<p>So I am looking to expand into the world of DevOps. Many years back I did server monitoring then stepped out of it. The climate changed a bit, I remember Perl and Python being big but my current company uses Ruby so that's something I have to deal with. </p> <p>I personally do some stuff with Docker and my company is a...阅读全文
<p>Hello, Ive briefly fiddled with golang and really like it so far. I love the simplicity of go routines. I work mostly with large python projects at work and have been thinking of starting to implement go instead. However, most of the projects I read about use go to do web development. I understand that go was designed for that application ...阅读全文
上篇文章中我们在使用的开发环境中增加了MySQL容器，然后介绍了使用database/sql标准库结合数据库驱动包进行数据库操作的方法。不过它们是相对偏底层的软件包。实际开发经常会使用一些在它的基础上封装的 ORM库。ORM的查询使用起来更简单些，语法更富表达力。这篇文章我们主要探究下面这些内容。 gorm的基本用法 如何管理ORM的使用 如何合理规划项目目录结构 安装gorm包 gorm是一个出色的，对开发人员友好的 Golang ORM 库，其支持的特性包括： 全特性 ORM (几乎包含所有特性) 模型关联 (一对一， 一对多，一对多（反向）， 多对多， 多态关联) 钩子 (Before/After Create/Save/Update/Delete/Find) 预加载 事务 复合主键 ...阅读全文
<p>I'm trying to write 90,000 rows to my MariaDB database.</p> <p>The MVC looks like this:</p> <pre><code> stmt, err := db.Prepare("INSERT INTO table_name(v1,v2,v3,v4,v5,v6,v7,v8) values(?,?,?,?,?,?,?,?)") for i := 0; i < 90000; i++ { wg.Add(1) go func(i int) { st...阅读全文
<p>Basically, user provides a list of files to copy from dest1 to dest2. rsync is fired off by pressing the submitting the button, and I want the realtime output of STDOUT/STDERR display in the same page. I would also be saving this execution as a blob in a MySQL DB. WebSockets?</p> <hr/>**评论：**<br/><br/>AG_Clinton: &l...阅读全文
<p>I have three elements consisting of 1 million, 2 million and 3 million ints respectively. I want to insert them to redis such that they all happen concurrently and the total execution time is not greater than the execution time of the 3 million ints. I tried using sync.Waitgroup but it doesn't speed up the execution. Here's...阅读全文
<p>Is it frowned upon to use Go to build Serverless Apps? Go is one of the supported languages for AWS Lambda but for Google's own Cloud Functions only Node.js is supported.</p> <hr/>**评论：**<br/><br/>SleeplessInS: <pre><p>This is because Google Cloud feature velocity is 1/10th that of Amazon Web Ser...阅读全文
<p>So as a programmer first getting their feet wet with Golang, I'm writing a simple command line blackjack program. When I was working on initializing an array of players, I was trying to set the balance of each player to start as 100 by doing the following package main import( "fmt" "strconv&...阅读全文
<p>I've recently moved from python to node and Im enjoying it however it doesn't support multithreading. I'm working on a project that entails webscraping and automating using electron. I want to make a web app that can withstand hundreds of users without effecting the performance too much as speed is extremely importa...阅读全文
<p>I want to build a test helper that takes a SQL query and some expected rows and asserts that they're equal: <code>func test(query string, wanted [][]interface{}) error</code>; however, the SQL interface expects pointers to values, so I'm pretty sure that for each row in <code>wanted</code>, I need to...阅读全文
<p>(I posted this in an ironic sub, but I think the question is worth being asked) </p> <p>I'm sure this debate has been had a trillion times by now, but how are generics necessary for reusability when we have interfaces. A reusable sort for instance, would just require the members of the input list to implement an ICompa...阅读全文
<p>Hi, I would like to present you a new project I have created, Proxy changer, hosted in <a href="https://github.com/okelet/proxychanger" rel="nofollow">https://github.com/okelet/proxychanger</a>. It's a Linux desktop application, that runs as a indicator, that allows you to configure multiple proxies and ...阅读全文
一、下载 去Golang官网 )下载需要的版本，这里直接下载苹果版的pkg 二、 安装 直接双击运行pkg，在弹出的安装页面直接安装就行了。 三、测试 输入go version测试go版本。用go env可以查看go环境的变量 默认安装的 GOROOT="/usr/local/go" GOPATH="/Users/admin/go" > go version go version go1.14.3 darwin/amd64 >go env GO111MODULE="" GOARCH="amd64" GOBIN="" GOCACHE="/Users/admin/Library/Caches/go-build" GOENV="/Users/admin/Library/Application Su...阅读全文
摘要： 大家好，这里和大家分享的是DataWorks数据集成中测试连通性失败的排查思路。与测试连通性成功与否的相关因素有很多，本文按照多个因素逐步排查，最终解决问题，希望大家以后再遇到此类问题，请参考此文，相信能够顺利解决您的问题。 一、问题现象 此案例中，DataWorks项目位于华东2，RDS Mysql数据源位于华东1（VPC网络），使用DataWorks进行数据同步之前，首先需要建立数据源，但在建立数据源RDS Mysql的配置页面，“测试连通性”失败，即数据源并没有连通。 1 二、问题处理过程 （1）首先，应该判断该数据源是否支持“测试连通性” 遇到测试连通性问题，首先应该判断该数据源是否支持“测试连通性”，请大家参考《各数据源测试连通性支持情况》。...阅读全文
<p>I think go generate is awesome, specially when combined of other toolkit goodnesses, like build tags, awesome community tools and external build tools. </p> <p>But it has its drawbacks, and it imposes some workflow restrictions that make it not always a desirable solution. </p> <p>The main problem being it doesn&a...阅读全文
<p>Hi folks. I have an <code>ID uint</code> on a model. I need to add to a RabbitMQ stack which only takes a slice of bytes, and I want to pass this ID as a slice of bytes. On my next service I want to grab this slice of bytes, convert it to a string (or back to uint would even be OK), and do a lookup based on it. I am fairly new ...阅读全文
<p>Hi I’m a noob and would like to know how to set the variables of a struct on console input thanks :) and if it’s possible to put that struct into a textfile</p> <hr/>**评论：**<br/><br/>justinisrael: <pre><p>Your question is both short and very broad. It actually covers a number of concepts, so any answer i...阅读全文
Go Web 编程--应用 ORM 上篇文章中我们在使用的开发环境中增加了MySQL容器，然后介绍了使用database/sql标准库结合数据库驱动包进行数据库操作的方法。不过它们是相对偏底层的软件包。实际开发经常会使用一些在它的基础上封装的 ORM库。ORM的查询使用起来更简单些，语法更富表达力。这篇文章我们主要探究下面这些内容。 gorm的基本用法 如何管理ORM的使用 如何合理规划项目目录结构 安装gorm包 gorm是一个出色的，对开发人员友好的 Golang ORM 库，其支持的特性包括： 全特性 ORM (几乎包含所有特性) 模型关联 (一对一， 一对多，一对多（反向）， 多对多， 多态关联) 钩子 (Before/After Create/Save/Update/Delete/...阅读全文
# 前言本文主要是写给那些想从事中间件开发的同学看的 ：）如果你没有这个打算，那么本文的学习路线非但不实用，还可能会影响你正常的工作 ：）# 什么是中间件开发？随着国内软件行业的发展，国内互联网公司规模越来越大，业务越来越复杂，随之使用大量的中间件来提高后台服务性能。由此产生了中间件开发和维护人员。诚然，在小公司，中间件，例如缓存，MQ，RPC 等服务，极大可能是由业务开发人员自己维护，或者委托第三方云平台运维（支付一些费用）。但，如果后台开发超过 200 人，基本就会组建自己的中间件或者基础架构团队，用于维护后台服务器基础架构和中间件。更大规模的公司，则由于各种各样的原因（性能，KPI），会自己开发中间件，简称自研。这要求中间件团队需要更多的人员。# 中间件开发人员需要哪些素质？既然需要中...阅读全文
<p>I created my first tutorial on video! It's a regexp primer, for those who are curious, and for those who feel uneasy when seeing a regexp pattern flying towards them. </p> <p><a href="https://appliedgo.net/regexp">https://appliedgo.net/regexp</a></p> <p>What do you think? Is it enjoyabl...阅读全文
<p>I have a database with lots of null values. Because of this I'm using the technique of passing them all as string pointers, as described in the docs. <a href="http://pastebin.com/S1y0RT8g" rel="nofollow">SAMPLE CODE</a></p> <p>I wrote some queries and used fmt.Sprintf to build some queries. ...阅读全文
<p><strong>TL,DR: looking for repos/bloggers/projects that focus (usually in "interpreter" contexts I guess) on highest-perf approaches to <em>runtime</em> encoding (then execution) of general-purpose turing-complete computations — whether via stack-based VMs with own minimalist opcode/bytecode 'langu...阅读全文
<p>Hi, I'm considering using Golang for my main language for web development, I'm trying to see if there is anything resembling Python's SQLAlchemy - basicly elliminating text query stitching (and to be clear I know SQL itself).</p> <p>And a web framework that would resemble Pyramid web framework functiona...阅读全文
<p>I know, concurrency is not parallel :) But I assumed Go routines would at least fill up available CPU cores. So made this little test on a Raspberry Pi 3 where I find primes in serial and using Go-Routines.</p> <p>The latter is much slower - which caught me by surprise.</p> <p>Just doing it in serial (primes from ...阅读全文
<p>Hello, I've been trying to improve performance of some code I wrote a while back, a write-up about the problem and some optimization ideas I tried to work with can be found here: <a href="http://www.geeksforgeeks.org/find-the-smallest-positive-number-missing-from-an-unsorted-array/">http://www.geeksforgeeks.org/find-t...阅读全文
<p>I'm learning Go by writing a <a href="https://github.com/hunterloftis/pbr">physically-based path-tracing renderer</a>. This is the first thing I've written in the language, and I'm learning along the way, so I'd appreciate any feedback more experienced gophers have.</p> <p>Ch...阅读全文
<p>So in case of most IO, Go handles multiple operation in a blocking synchronous way. But since goroutines use very light threads and its own scheduler, it doesn't matter how many goroutines it spawns, and it never becomes an issue. Am I understanding correctly?</p> <hr/>**评论：**<br/><br/>McHoff: <pre><...阅读全文
docker的基础中的基础操作 docker 安装软件 docker pull appName:latest 查看已有镜像 docker images 运行容器 docker run -参数 appName 常见的实例: 运行redis: docker run -itd --name redis -p 6379:6379 redis 运行mongodb: docker run -itd --name mongo-local -p 27017:27017 运行mysql: docker run -itd --name mysql-test -p 3306:3306 -e MYSQL_ROOT_PASSWORD=123456 mysql 运行consul: docker run -itd --n...阅读全文
<p>Hi, sorry for asking a pretty simple question but I can't seem to find a definitive answer.</p> <p>I have a custom type I use throughout my codebase and I tried to stick to using value receivers because I had no need to perform any mutations.</p> <p>Now I need to update a variable the custom type relies on...阅读全文
<p>Hello everyone. I'm looking to learn to code as a hobby, so I'd like to get into a language that isn't too hard to understand for a beginner. I already studied the basics of Go, but I am very confused on Methods and Interfaces, it seems to me that the concept of Classes makes code easier to understand, so I'...阅读全文
<p>Swan is a new container framework from China team, <a href="https://github.com/Dataman-Cloud/swan">https://github.com/Dataman-Cloud/swan</a></p> <p>it now heavily developed, welcome to use it and give some feedback.</p> <h4>Features</h4> <ul> <li>Application Management</li...阅读全文
<p>If your coding something small with sensitive elements which has a web endpoint accessible to 1-5 people what is your go to solution.</p> <p><strong>Traits</strong></p> <ul> <li>Secure</li> <li>Simple with small code footprint</li> <li>Access setup can be manual (no forgot...阅读全文
<p>We currently have api built using Django Rest Framework which uses Gearman client + MySQL 5.7 in backend.Is it possible to migrate into Go and if we do migrate will it be faster than django. </p> <hr/>**评论：**<br/><br/>jackmott2: <pre><p>It might be faster than django if your code is currently slow becau...阅读全文
Golang: 思路：二分思路往往是想起来很简单，但实现起来很容易出错，主要原因其实就是在于边界问题，这题也是一样 代码如下： func hIndex(citations []int) int { low,high,res:=0,len(citations)-1,0 for low<=high{ mid:=low+(high-low)/2 if citations[len(citations)-mid-1]>=mid+1{ if mid+1>res{ res=mid+1 } low=mid+1 }else{ high=mid-1 } } return res ...阅读全文
<p>FCC Commissioner Ajit Pai is advancing a plan to kill net neutrality and let ISPs like Comcast and Verizon slow down or censor websites and apps. His plan would make the Internet slower and more expensive, and it would make censorship for profit the norm. </p> <p>We can stop this like we stopped SOPA, TPP, and ACTA. We just ne...阅读全文
<p>I would like to create an overlay for one of my video games that I play. I've searched around a bit and can't find a repo that would allow me to draw vectors every 16 milliseconds (60fps) without taking a big performance hit.</p> <p>Do any of you gophers know of a repo that will let me draw ontop of a window wi...阅读全文
文: The Top 10 Most Common Mistakes I’ve Seen in Go Projects 作者: Teiva Harsanyi 译者: Simon Ma 我在Go开发中遇到的十大常见错误。顺序无关紧要。 未知的枚举值 让我们看一个简单的例子: type Status uint32 const ( StatusOpen Status = iota StatusClosed StatusUnknown ) 在这里，我们使用iota创建了一个枚举，其结果如下： StatusOpen = 0 StatusClosed = 1 StatusUnknown = 2 现在，让我们假设这个Status类型是JSON请求的一部分，将被marshalled/unmarshalled...阅读全文
<p>Hello All,</p> <p>I just started with Go, and am loving it. Am trying to do something like this in Go,</p> <pre><code>type BaseModel struct { ID int } type User struct { BaseModel Surname string } type Base interface { Get(id int) error } // Also I dont want to have to write this for U...阅读全文
<p>Hi all. I've written a good deal of code in Python, C, C#, Java, and Rust, and I'm having kind of a hard time with Go. It might be that I've been spending too much time in Rust, but for a compiled language, it seems like Go's type system is insufficiently expressive, what with the lack of either generics or ...阅读全文
