go

How to parse Prometheus data

由 不羁的心 提交于 2021-02-04 21:42:32
问题 I have been able to obtain the metrices by sending an HTTP GET as follows: # TYPE net_conntrack_dialer_conn_attempted_total untyped net_conntrack_dialer_conn_attempted_total{dialer_name="federate",instance="localhost:9090",job="prometheus"} 1 1608520832877 Now I need to parse this data and obtain control over every piece of data so that I can convert tand format like json. I have been looking into the ebnf package in Go: ebnf package Can somebody point me the right direction to parse the

EDAS 微服务应用同城容灾最佳实践

由 早过忘川 提交于 2021-02-04 20:40:16
前言 上云目前已经是绝大数企业首选的IT基础设施建设方案，但是云上仍然存在一些不确定因素（机房硬件故障、网络故障、断网/断电、人为操作失误），导致各大云厂商每年在不同的数据中心都会发生一些故障，所以建设具备容灾能力的业务应用是必需的。公共云上容灾解决方案涵盖同城双活、跨Region容灾和异地多活等容灾场景，对公共云上大多数中长尾客户来说，更需要的是一种对应用侵入性小甚至透明，但又能保证高可用的容灾方案，同城双活无疑是首选的容灾方案，大多数业务应用只要做到同城双活，就可以避免掉大多数数据中心不可用故障。 本实践就是帮助大家高效、低成本地实现自己的业务应用具备同城双活容灾能力。通过这篇文章可以基于EDAS高效的实现同城双活容灾，在实现这些容灾场景的同时需要其他的阿里产品配合，也会一并介绍对应的解决方案，可以参考下面架构图： 鉴于目前需要做容灾的主流架构都已经拆分为微服务架构，而且微服务架构本身也是一种具备更强容灾高可用能力的架构。微服务架构一般由网关（统一接入层）、RPC框架（Dubbo，Spring Cloud）、消息(MQ)、分布式数据库、缓存等核心软件构成，通过EDAS可以高效地实现入口流量切流、RPC路由容灾、多可用区部署等能力，参考下图： 方案主要产品介绍 EDAS 企业级分布式应用服务 EDAS（Enterprise Distributed Application

How to compare the identity of maps OR what's going on in this example?

由 假装没事ソ 提交于 2021-02-04 20:38:12
问题 I'm trying to compare the identity of 2 maps package main import "fmt" func main() { a := map[int]map[int]int{1:{2:2}} b := a[1] c := a[1] // I can't do this: // if b == c // because I get: // invalid operation: b == c (map can only be compared to nil) // but as far as I can tell, mutation works, meaning that the 2 maps might actually be identical b[3] = 3 fmt.Println(c[3]) // so mutation works... fmt.Printf("b as pointer::%p\n", b) fmt.Printf("c as pointer::%p\n", c) // ok, so maybe these

How to compare the identity of maps OR what's going on in this example?

由 烈酒焚心 提交于 2021-02-04 20:37:50
问题 I'm trying to compare the identity of 2 maps package main import "fmt" func main() { a := map[int]map[int]int{1:{2:2}} b := a[1] c := a[1] // I can't do this: // if b == c // because I get: // invalid operation: b == c (map can only be compared to nil) // but as far as I can tell, mutation works, meaning that the 2 maps might actually be identical b[3] = 3 fmt.Println(c[3]) // so mutation works... fmt.Printf("b as pointer::%p\n", b) fmt.Printf("c as pointer::%p\n", c) // ok, so maybe these

How to compare the identity of maps OR what's going on in this example?

由 好久不见. 提交于 2021-02-04 20:36:30
问题 I'm trying to compare the identity of 2 maps package main import "fmt" func main() { a := map[int]map[int]int{1:{2:2}} b := a[1] c := a[1] // I can't do this: // if b == c // because I get: // invalid operation: b == c (map can only be compared to nil) // but as far as I can tell, mutation works, meaning that the 2 maps might actually be identical b[3] = 3 fmt.Println(c[3]) // so mutation works... fmt.Printf("b as pointer::%p\n", b) fmt.Printf("c as pointer::%p\n", c) // ok, so maybe these

How to create an enum and iterate over it

由 自古美人都是妖i 提交于 2021-02-04 19:59:54
问题 I'm trying to replicate the Java enums in Go. I would like to define an enum and then iterate over it to do some validations. Something like this in java public enum Direction { NORTH, NORTHEAST, EAST, SOUTHEAST, SOUTH, SOUTHWEST, WEST, NORTHWEST } And the I would like to iterate over it, like this: for (Direction dir : Direction.values()) { // do what you want } Is there a similar way to achieve this in Golang, I'm thinking in using structs but I don't think it's the best way. Any ideas? 回答1

Removing an element from a type asserted Slice of interfaces

由 六眼飞鱼酱① 提交于 2021-02-04 19:57:50
问题 In Golang, after asserting to a slice, how is one able to remove an element from said slice? For example, the following returns the error cannot assign to value.([]interface {}) value.([]interface{}) = append(value.([]interface{})[:i],value.([]interface{})[i+1:]...) 回答1: If you have a slice value wrapped in an interface, you can't change it. You can't change any value wrapped in interfaces. When an interface value is created to wrap a value, a copy is made and stored in the interface. When

Removing an element from a type asserted Slice of interfaces

由 主宰稳场 提交于 2021-02-04 19:52:11
问题 In Golang, after asserting to a slice, how is one able to remove an element from said slice? For example, the following returns the error cannot assign to value.([]interface {}) value.([]interface{}) = append(value.([]interface{})[:i],value.([]interface{})[i+1:]...) 回答1: If you have a slice value wrapped in an interface, you can't change it. You can't change any value wrapped in interfaces. When an interface value is created to wrap a value, a copy is made and stored in the interface. When

Run shell command with “redirecting of an output from a subshell” statement within go

由 让人想犯罪 __ 提交于 2021-02-04 19:42:29
问题 According to run bash command in new shell and stay in new shell after this command executes, how can I run command: bash --rcfile <(echo "export PS1='> ' && ls") within golang? I've tried many combinations of exec.Command() but they did't work. For example: exec.Command("bash", "--rcfile", `<("echo 'ls'")`) I've also read this os, os/exec: using redirection symbol '<' '>' failed, but I think maybe my case is a bit more complicated. 回答1: You're almost there - I think the confusion is you're

Properly distinguish between not set (nil) and blank/empty value

由 南笙酒味 提交于 2021-02-04 19:08:44
问题 Whats the correct way in go to distinguish between when a value in a struct was never set, or is just empty, for example, given the following: type Organisation struct { Category string Code string Name string } I need to know (for example) if the category was never set, or was saved as blank by the user, should I be doing this: type Organisation struct { Category *string Code *string Name *string } I also need to ensure I correctly persist either null or an empty string to the database I'm
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