Go实战--也许最快的Go语言Web框架kataras/iris初识二(TOML、Cache、Cookie)

生命不止，继续 go go go!!!

昨天介绍了iris框架，介绍了如何使用basic认证、Markdown、YAML、Json等：
Go实战–也许最快的Go语言Web框架kataras/iris初识(basic认证、Markdown、YAML、Json)

继续跟大家一起学习iris框架.

TOML

什么是toml?
toml也是一种配置文件，关于golang中配置文件的使用之前也有介绍过：
Go实战–go语言中使用YAML配置文件(与json、xml、ini对比)

toml是Tom’s Obvious, Minimal Language.的缩写！

配置文件的使用由来已久，从.ini、XML、JSON、YAML再到TOML，语言的表达能力越来越强，同时书写便捷性也在不断提升。 TOML是前GitHub CEO， Tom Preston-Werner，于2013年创建的语言，其目标是成为一个小规模的易于使用的语义化配置文件格式。TOML被设计为可以无二义性的转换为一个哈希表(Hash table)。

github地址：
https://github.com/toml-lang/toml

Star: 6478

例子

# This is a TOML document.

title = "TOML Example"

[owner]
name = "Tom Preston-Werner"
dob = 1979-05-27T07:32:00-08:00 # First class dates

[database]
server = "192.168.1.1"
ports = [ 8001, 8001, 8002 ]
connection_max = 5000
enabled = true

[servers]

  # Indentation (tabs and/or spaces) is allowed but not required
  [servers.alpha]
  ip = "10.0.0.1"
  dc = "eqdc10"

  [servers.beta]
  ip = "10.0.0.2"
  dc = "eqdc10"

[clients]
data = [ ["gamma", "delta"], [1, 2] ]

# Line breaks are OK when inside arrays
hosts = [
  "alpha",
  "omega"
]

看到了吧，不关心空格和缩进。

规范
大小写敏感
必须是UTF-8编码
不关心空格、缩进
使用#进行注释

Go中操作TOML的优秀开源库
https://github.com/BurntSushi/toml
https://github.com/pelletier/go-toml
具体的之后会专业写博客介绍

iris读取toml
新建iris.tml文件：

DisablePathCorrection = false
EnablePathEscape = false
FireMethodNotAllowed = true
DisableBodyConsumptionOnUnmarshal = false
TimeFormat = "Mon, 01 Jan 2006 15:04:05 GMT"
Charset = "UTF-8"

[Other]
    MyServerName = "iris"

main.go:

package main

import (
    "github.com/kataras/iris"
    "github.com/kataras/iris/context"
)

func main() {
    app := iris.New()

    app.Get("/", func(ctx context.Context) {
        ctx.HTML("Hello Iris TOML!")
    })

    app.Run(iris.Addr(":8080"), iris.WithConfiguration(iris.TOML("iris.tml")))
}

Cache

关于缓存，一直没有跟大家介绍，github上也有很多关于golang的优秀的Cache库：
patrickmn/go-cache
An in-memory key:value store/cache (similar to Memcached) library for Go, suitable for single-machine applications.

golang/groupcache
groupcache is a caching and cache-filling library, intended as a replacement for memcached in many cases.
同样，我们以后再进行详细介绍，这里我们看看iris中使用Cache：

package main

import (
    "time"

    "github.com/kataras/iris"
    "github.com/kataras/iris/cache"
    "github.com/kataras/iris/context"
)

func main() {
    app := iris.Default()
    cachedHandler := cache.WrapHandler(h, 2*time.Minute)
    app.Get("/hello", cachedHandler)
    app.Run(iris.Addr(":8080"))
}

func h(ctx context.Context) {
    ctx.HTML("
 Hello, this should be cached. Every 2 minutes it will be refreshed, check your browser's inspector
")
}

cookie

关于cookie，之前也有些文章分享过：
Go实战–go中使用cookie(The way to go)

iris当然不会缺少cookie的功能了。

package main

import (
    "github.com/kataras/iris"
    "github.com/kataras/iris/context"

    "github.com/kataras/iris/sessions"

    "github.com/gorilla/securecookie"
)

func newApp() *iris.Application {
    app := iris.New()

    cookieName := "mycustomsessionid"
    // AES only supports key sizes of 16, 24 or 32 bytes.
    // You either need to provide exactly that amount or you derive the key from what you type in.
    hashKey := []byte("the-big-and-secret-fash-key-here")
    blockKey := []byte("lot-secret-of-characters-big-too")
    secureCookie := securecookie.New(hashKey, blockKey)

    mySessions := sessions.New(sessions.Config{
        Cookie: cookieName,
        Encode: secureCookie.Encode,
        Decode: secureCookie.Decode,
    })

    app.Get("/", func(ctx context.Context) {
        ctx.Writef("You should navigate to the /set, /get, /delete, /clear,/destroy instead")
    })
    app.Get("/set", func(ctx context.Context) {

        //set session values
        s := mySessions.Start(ctx)
        s.Set("name", "iris")

        //test if setted here
        ctx.Writef("All ok session setted to: %s", s.GetString("name"))
    })

    app.Get("/get", func(ctx context.Context) {
        // get a specific key, as string, if no found returns just an empty string
        s := mySessions.Start(ctx)
        name := s.GetString("name")

        ctx.Writef("The name on the /set was: %s", name)
    })

    app.Get("/delete", func(ctx context.Context) {
        // delete a specific key
        s := mySessions.Start(ctx)
        s.Delete("name")
    })

    app.Get("/clear", func(ctx context.Context) {
        // removes all entries
        mySessions.Start(ctx).Clear()
    })

    app.Get("/update", func(ctx context.Context) {
        // updates expire date with a new date
        mySessions.ShiftExpiration(ctx)
    })

    app.Get("/destroy", func(ctx context.Context) {
        //destroy, removes the entire session data and cookie
        mySessions.Destroy(ctx)
    })

    return app
}

func main() {
    app := newApp()
    app.Run(iris.Addr(":8080"))
}

浏览器访问：http://localhost:8080/set
http://localhost:8080/get