go

Redis 集群解决方案 Codis

大兔子大兔子 提交于 2021-02-10 06:34:17
Codis 详细介绍 Codis 是一个分布式 Redis 解决方案, 对于上层的应用来说, 连接到 Codis Proxy 和连接原生的 Redis Server 没有明显的区别 (不支持的命令列表), 上层应用可以像使用单机的 Redis 一样使用, Codis 底层会处理请求的转发, 不停机的数据迁移等工作, 所有后边的一切事情, 对于前面的客户端来说是透明的, 可以简单的认为后边连接的是一个内存无限大的 Redis 服务. Codis 由四部分组成: Codis Proxy (codis-proxy) Codis Manager (codis-config) Codis Redis (codis-server) ZooKeeper codis-proxy 是客户端连接的 Redis 代理服务, codis-proxy 本身实现了 Redis 协议, 表现得和一个原生的 Redis 没什么区别 (就像 Twemproxy ), 对于一个业务来说, 可以部署多个 codis-proxy, codis-proxy 本身是无状态的. codis-config 是 Codis 的管理工具, 支持包括, 添加/删除 Redis 节点, 添加/删除 Proxy 节点, 发起数据迁移等操作. codis-config 本身还自带了一个 http server, 会启动一个

Best way to pass context.Context to a closure executed in a separate goroutine

三世轮回 提交于 2021-02-10 06:00:16
问题 What is best way to pass context.Context to closure to be executed in a separate goroutine? Since I'm not mutating context.Context inside the closure, I assume both options are valid. 2nd option can save me tiny bit of memory by not copying the interface. 1) pass as an argument func run(ctx context.Context) { for i := 0; i <= 5; i++ { go func(id int, ictx context.Context) { for { select { case <- ictx.Done(): return default: // do something } } }(i, ctx) } } 2) expose outer context variable

Hacker News 简讯 2021-02-10

牧云@^-^@ 提交于 2021-02-10 05:55:11
最后更新时间: 2021-02-10 05:00 Creeping as a Service - (every.to) - [中文翻译版] 作为服务爬行 得分:90 | 评论:11 | 评论翻译 Browser Fuzzing at Mozilla - (hacks.mozilla.org) - [中文翻译版] Mozilla浏览器模糊化 得分:111 | 评论:6 | 评论翻译 Minesweeper automates root cause analysis as a first-line defense against bugs - (fb.com) - [中文翻译版] 扫雷艇自动进行根本原因分析,作为对付虫子的第一道防线 得分:45 | 评论:7 | 评论翻译 Launch HN: SigNoz (YC W21) – Open-source alternative to DataDog - [中文翻译版] 发布HN:SigNoz(ycw21)–DataDog的开源替代品 得分:146 | 评论:47 | 评论翻译 Pattern Matching Accepted for Python - (lwn.net) - [中文翻译版] Python接受的模式匹配 得分:72 | 评论:29 | 评论翻译 Looking at GSM security 30 years later

讨厌手写,印度小哥开源了一个手写体转换工具,支持中文

≡放荡痞女 提交于 2021-02-10 05:48:57
【导语】:Text-to-Handwriting 是一个在线的开源工具,可以将文字输入转为手写体,并提供图片下载。 简介 Text-to-Handwriting 的开发者是个印度小哥,他讨厌手写作业,所以开发了这个工具,可以将文字输入转化为手写体,并提供图片下载。工具使用了以下第三方库: html2canvas,用于将 dom 元素转化为 canvas; jsPDF,以图片为原型生成对应的PDF文件; cypress,用于测试的库。这个库开源前哨介绍过,是一个很强大的自动化测试工具,详情点击 这里查看 ; serve,用于启动本地服务; 该项目是作者出于好玩开发的,目前存在一些问题,并且这个工具作者不是全职在维护,有些问题疑问无法及时解答,同时也呼吁更多的开发者参与进来。以下是一个已知的问题: 使用自定义字体时,字母之间会有间隙。作为临时解决方案,提供了调整字母间隙和单词间隙的选项来处理这个问题 项目地址: https://github.com/saurabhdaware/text-to-handwriting 简单使用 作者提供了一个在线地址供我们使用,地址是: https://saurabhdaware.github.io/text-to-handwriting/工具使用很简单,在左边 Input 输入需要转化的文字,右边选择手写字体,字体大小,图片尺寸,单词、字母间隙等

Source missing function body, how is it compiling? [duplicate]

半世苍凉 提交于 2021-02-09 11:51:06
问题 This question already has answers here : Bodiless function in Golang (2 answers) Closed 3 years ago . In the Go lang source code, I see a function declared without any body. https://github.com/golang/go/blob/master/src/math/log10.go#L9 func Log10(x float64) float64 But when I do the same it gives me an error: missing function body for __ https://play.golang.org/p/Ncp-0-8vHB How is this working in the Go source code? I mean how is the math package compiling? Is this source file just for

Source missing function body, how is it compiling? [duplicate]

可紊 提交于 2021-02-09 11:50:23
问题 This question already has answers here : Bodiless function in Golang (2 answers) Closed 3 years ago . In the Go lang source code, I see a function declared without any body. https://github.com/golang/go/blob/master/src/math/log10.go#L9 func Log10(x float64) float64 But when I do the same it gives me an error: missing function body for __ https://play.golang.org/p/Ncp-0-8vHB How is this working in the Go source code? I mean how is the math package compiling? Is this source file just for

Cant unmarshall dynamodb attribute

眉间皱痕 提交于 2021-02-09 11:47:22
问题 I'm experimenting with AWS-SDK-GO with the DynamoDB API... I'm trying to query the db and return a string. But I'm having some issues unmarshelling the return value.... struct type Item struct { slug string destination string } query function input := &dynamodb.GetItemInput{ Key: map[string]*dynamodb.AttributeValue{ "slug": { S: aws.String(slug), }, }, TableName: db.TableName, } result, err := db.dynamo.GetItem(input) if err != nil { return "", err } n := Item{} err = dynamodbattribute

Order of evaluation in a slice literal

核能气质少年 提交于 2021-02-09 10:50:34
问题 I recently went through Go's "Language Specification" https://golang.org/ref/spec#Order_of_evaluation but found the order of evaluation being different from what it is explained in this document. For example, it says: a := 1 f := func() int { a++; return a } x := []int{a, f()} // x may be [1, 2] or [2, 2]: evaluation order between a and f() is not specified Then I tried with this code: package main import "fmt" func main() { for { result := evaluate() if result == 1 { break } } } func

Order of evaluation in a slice literal

依然范特西╮ 提交于 2021-02-09 10:50:29
问题 I recently went through Go's "Language Specification" https://golang.org/ref/spec#Order_of_evaluation but found the order of evaluation being different from what it is explained in this document. For example, it says: a := 1 f := func() int { a++; return a } x := []int{a, f()} // x may be [1, 2] or [2, 2]: evaluation order between a and f() is not specified Then I tried with this code: package main import "fmt" func main() { for { result := evaluate() if result == 1 { break } } } func