ENV STRINGS

Read Env from config and compile the values into string.

About ENV JSON

Sometimes we need use some config string as following:

db.conf

configStr:="127.0.0.1|123456|1000"

but, when we management more and more server and serivce, and if we need change the password or ip, it was a disaster.

So, we just want use config string like this.

db.conf

configStr:="{{.host}}|{{.password}}|{{.timeout}}"

We use golang's template to replace values into the config while we execute the string.

first, we set the env config at ~/.bash_profile or ~/.zshrc, and the default key is ENV_STRINGS and the default file extention is .env, the value of ENV_STRINGS could be a file or folder,it joined by;, it will automatic load all *.env files.

Env

export ENV_STRINGS ='~/playgo/test.env;~/playgo/test2.env'

or

export ENV_STRINGS ='~/playgo'

example program

package main

import (
	"fmt"

	"github.com/gogap/env_strings"
)

func main() {
	if ret, err := env_strings.Execute("{{.host}}|{{.password}}|{{.timeout}}"); err != nil {
		fmt.Println(err)
	} else {
		fmt.Println(ret)
	}

	envStrings := env_strings.NewEnvStrings("ENV_KEY", ".env")

	if ret, err := envStrings.Execute("{{.host}}|{{.password}}|{{.timeout}}"); err != nil {
		fmt.Println(err)
	} else {
		fmt.Println(ret)
	}
}

env1.json

{
	"host":"127.0.0.1",
	"password":"123456"
}

env2.json

{
	"timeout":1000
}

result:

{127.0.0.1 123456 1000}

Advance

use redis to storage conf

we should set the config file of /etc/env_strings.conf (default path) before use, or set config file path by system ENV with your '~/.bash_profile' or ~/.zshrc, the key is ENV_STRINGS_CONF, just edit like this: export ENV_STRINGS_CONF=/etc/env_strings.conf

/etc/env_strings.conf

{
    "storages": [{
        "engine": "redis",
        "options": {
            "db": 1,
            "password": "",
            "pool_size": 10,
            "address": "localhost:6379"
        }
    }]
}

set data to redis

> redis-cli -n 1 set name gogap
OK
> redis-cli -n 1 get name
gogap
> redis-cli -n 1 set key field value
OK
> redis-cli -n 1 hget key field
value

redis command: redis_get

config template:

{
	"name":"{{redis_get "name"}}"
}

result:

{
	"name":"gogap"
}

if key not exist, and we want get a default value

{
	"name":"{{redis_get "noexistkey" "gogap"}}"
}

result:

{
	"name":"gogap"
}

redis command: redis_hget

config template:

{
	"name":"{{redis_hget "key" "field"}}"
}

result:

{
	"name":"value"
}

if key or filed not exist, and we want get a default value

{
	"name":"{{redis_hget "key2" "filed" "gogap"}}"
}

result:

{
	"name":"gogap"
}