go

How to merge a json array of json objects to a single json object

由 若如初见. 提交于 2021-01-28 12:01:50
问题 I need to merge json array of objects such the values of same keys are appended Lets say I have an unknown json array like "jsonarray": [ { "behavior": [ "file", "create_doc_exe" ], "id": 3303511, "platform": "Windows 7 x64 SP1, Adobe Reader 11, Flash 11, Office 2010" }, { "info": [ "sign , 3c4e53e " ], "behavior": [ "sys_folder", "file", "process", "crash" ], "id": 3303, "platform": "Windows XP, Adobe Reader 9.4.0, Flash 10, Office 2007" } ] I want the result to be this way: "jsonarray": {

Regular Expression to mask any string matching 10 digits only in golang

由 梦想的初衷 提交于 2021-01-28 11:52:59
问题 Since golang regex does not support lookaheads, I was wondering is there any way i can create a regex that will mask any string having a 10 digit number. func main() { s := "arandomsensitive information: 1234567890 this is not senstive: 1234567890000000" re := regexp.MustCompile(`\d{10}`) s = re.ReplaceAllString(s, "$1**********$2") fmt.Println(s) } Is it possible to get an output like this "arandomsensitive information: 1234****** this is not senstive: 1234567890000000" Also any regex

All goroutines are asleep

由 瘦欲@ 提交于 2021-01-28 11:46:48
问题 I write some code which aims to synchronize using channel. var counter int64 // shared resource var wg sync.WaitGroup func main() { ch := make(chan int64) wg.Add(2) go incCounter(ch) go incCounter(ch) ch <- counter wg.Wait() fmt.Println("Final Counter:", counter) // expected value is 4 } func incCounter(ch chan int64) { defer wg.Done() for count := 0; count < 2; count++ { value := <-ch value++ counter = value ch <- counter } } When I ran this program, an error happened: all goroutines are

Check if function is being called as goroutine or not

由 我与影子孤独终老i 提交于 2021-01-28 10:56:25
问题 Is there any way to find out if a running function was called as goroutine or not? I've read 'go tour' and I am interested in building a websocket server with golang, so I found this tutorial https://tutorialedge.net/golang/go-websocket-tutorial/ Now I'm wondering if wsEndpoint function from the tutorial is invoked as goroutine (e.g. go wsEndpoint(...)) or not. I've tried to read http package documentation, but did not get clear picture, just a guess that the handler will be called with go

how to append nil to dynamic type slice by reflect.Append

由 我是研究僧i 提交于 2021-01-28 10:03:53
问题 Code below will raise a runtime error when append reflect.Value of nil : package main import ( "fmt" "reflect" ) func main() { var list []interface{} v := reflect.ValueOf(list) v = reflect.Append(v, reflect.ValueOf(1)) // [1] v = reflect.Append(v, reflect.ValueOf("1")) // [1, 1] v = reflect.Append(v, reflect.ValueOf(nil)) // runtime error fmt.Println(v) } So why there is a runtime error? how can I use reflect.Append to add a nil to interface{} slice? 回答1: interface{} is an interface type, and

how to append nil to dynamic type slice by reflect.Append

由 喜欢而已 提交于 2021-01-28 10:02:30
问题 Code below will raise a runtime error when append reflect.Value of nil : package main import ( "fmt" "reflect" ) func main() { var list []interface{} v := reflect.ValueOf(list) v = reflect.Append(v, reflect.ValueOf(1)) // [1] v = reflect.Append(v, reflect.ValueOf("1")) // [1, 1] v = reflect.Append(v, reflect.ValueOf(nil)) // runtime error fmt.Println(v) } So why there is a runtime error? how can I use reflect.Append to add a nil to interface{} slice? 回答1: interface{} is an interface type, and

ReactJS sent GET request, responded with 302 redirect, received CORS error

由 拥有回忆 提交于 2021-01-28 09:42:47
问题 This is my stack: Frontend server: Node + ReactJS ( f.com ) Backend server (API): Golang ( b.com ) I'm doing this in development environment where I use create-react-app to run my frontend server via npm start command. I want to perform authentication using SSO served at sso.example.com/login . Ideally whenever there's a request to the Backend server without proper authorization, it will be responded with HTTP 302 Redirect to the SSO page. So the sequence is: ReactJS sends GET request to b

EventMesh:微众银行开源的新型云原生事件驱动架构实践

由 二次信任 提交于 2021-01-28 09:18:42
前言 2020 年微众银行在 GitHub 上正式开源了 EventMesh。 EventMesh 和 DeFiBus一起作为微众银行已经开源的项目，目前支撑了微众银行每天亿级的金融交易。 作为一个动态插件式云原生基础服务，EventMesh 提供了灵活，可靠和快速的事件分发与处理，并且可进行管理。本篇文章将围绕 EventMesh 起源及原理等方面进行介绍，并结合微众银行的实践经验带领大家一起探索事件驱动架构。 01 什么是事件驱动架构 近年来，随着微服务、云原生和 Serverless 概念的普及以及容器化技术的发展，事件驱动也再次成为热点，引起IT界广泛的关注。事件驱动架构是一种用于设计应用的软件架构和模型。对于事件驱动系统而言，事件的捕获、通信、处理和持久保留是解决方案的核心结构。事件驱动架构可以最大程度减少耦合度，很好地扩展与适配不同类型的服务组件，因此是现代化分布式应用架构的理想之选。 解耦 基于这种松耦合，微服务可以用不同的语言实现。解耦后的微服务能够轻松地在网络上相互独立地扩展，通过动态添加或删除事件生产者和消费者来修改他们的系统，而不需要更改任何微服务中的任何逻辑。 基于推送通知的消息传输机制 事件驱动的体系结构中，客户端无需轮询就可以接收更新，事件在到达事件存储后就会通知给客户端，客户端可以随时接收更新，这对于动态数据转换、分析和数据科学处理非常有用。

Using Golang to read csv, reorder columns then write result to a new csv with Concurrency

由 别等时光非礼了梦想. 提交于 2021-01-28 09:18:20
问题 Here's my starting point. It is a Golang script to read in a csv with 3 columns, re-order the columns and write the result to a new csv file. package main import ( "fmt" "encoding/csv" "io" "os" "math/rand" "time" ) func main(){ start_time := time.Now() // Loading csv file rFile, err := os.Open("data/small.csv") //3 columns if err != nil { fmt.Println("Error:", err) return } defer rFile.Close() // Creating csv reader reader := csv.NewReader(rFile) lines, err := reader.ReadAll() if err == io
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