[轉]Easy Middleware in Go

https://dev.to/kevburnsjr/easy-middleware-in-go

[轉]Go + Microservices = Go kit

https://peter.bourgon.org/applied-go-kit/#1

[轉]bestpractices.slide

https://talks.golang.org/2013/bestpractices.slide#19

[轉]Standard Package Layout

https://medium.com/@benbjohnson/standard-package-layout-7cdbc8391fc1

[轉]Go best practices, six years in

https://peter.bourgon.org/go-best-practices-2016/

go control docker

https://blog.kowalczyk.info/article/w4re/using-mysql-in-docker-for-local-testing-in-go.html

https://github.com/kjk/go-cookbook/tree/master/start-mysql-in-docker-go

[轉]谁吃了我的Linux内存?

http://colobu.com/2017/03/07/what-is-in-linux-cached/#more


slabtop -s c

======================

pcstat

https://github.com/tobert/pcstat

#!/bin/bash



#you have to install pcstat

if [ ! -f /data0/brokerproxy/pcstat ]

then

    echo "You haven't installed pcstat yet"

    echo "run \"go get github.com/tobert/pcstat\" to install"

    exit

fi



#find the top 10 processs' cache file

ps -e -o pid,rss|sort -nk2 -r|head -10 |awk '{print $1}'>/tmp/cache.pids

#find all the processs' cache file

#ps -e -o pid>/tmp/cache.pids



if [ -f /tmp/cache.files ]

then

    echo "the cache.files is exist, removing now "

    rm -f /tmp/cache.files

fi



while read line

do

    lsof -p $line 2>/dev/null|awk '{print $9}' >>/tmp/cache.files 

done</tmp/cache.pids





if [ -f /tmp/cache.pcstat ]

then

    echo "the cache.pcstat is exist, removing now"



    rm -f /tmp/cache.pcstat

fi



for i in `cat /tmp/cache.files`

do



    if [ -f $i ]

    then



        echo $i >>/tmp/cache.pcstat

    fi

done



/data0/brokerproxy/pcstat  `cat /tmp/cache.pcstat`



rm -f /tmp/cache.{pids,files,pcstat}

go aws ec2 control

package main

import (

"fmt"

    "log"

"net/http"

    "io/ioutil"

    

    "github.com/gorilla/mux"

    "github.com/smartystreets/go-aws-auth"

)

func stopEC2InstanceHandler(w http.ResponseWriter, req *http.Request) {

    vars := mux.Vars(req)

    

    w.Write([]byte(fmt.Sprintf("stopEC2InstanceHandler: %v \n\n", vars["id"])))

    

    

    var Action = "StopInstances" //check aws website

    var Version = "2016-11-15" //need to check api version from aws website

    

//regoin need to check url from aws website. ex: ap-northeast-2

//some region no support some action

    apiUrl := "https://ec2.ap-northeast-2.amazonaws.com/?Action=" + Action + "&Version=" + Version + "&InstanceId.1=" + vars["id"]

    

    client := new(http.Client)

    req, err := http.NewRequest("GET", apiUrl, nil)

    aws_secret_access_key := "ooooooxxxxxxx"

    aws_access_key_id := "ooooooxxxxxxx"

    

    awsauth.Sign(req, awsauth.Credentials{

        AccessKeyID: aws_access_key_id,

        SecretAccessKey: aws_secret_access_key,

        //SecurityToken: "",    // STS (optional)

    })

    

    //awsauth.Sign(req) // Automatically chooses the best signing mechanism for the service

    resp, err := client.Do(req)

    

    fmt.Printf("\n\nGet = |%#v|, |%v|\n\n", resp, err)

    if err != nil {

        fmt.Println(err)

}

    

    if resp == nil {

        return

    }

    

    defer resp.Body.Close()

    

    

    body, err := ioutil.ReadAll(resp.Body)

    if err != nil {

        fmt.Println(err)

    }

    

    fmt.Println(string(body))

    w.Write([]byte(body))

    

}

func main() {

    

    r := mux.NewRouter()

    

    r.HandleFunc("/stopEC2InstanceHandler/{id}", stopEC2InstanceHandler).Methods("GET")

    fmt.Println("Endpoint Hit: ./")

    

log.Fatal(http.ListenAndServe(":8080", r))

}

======================Then========================

github.com/smartystreets/go-aws-auth HAVE bug for regoin, auto regoin can't v4

some just change source code

go\src\github.com\smartystreets\go-aws-auth\awsauth.go

func Sign

    signVersion := awsSignVersion[service]

signVersion=4 //add this line in here. let api just use v4

Now ok to use this code.