在文件之间使用环境变量-GOPATH [英] Using Environment Variables across files - GOPATH

问题描述

这是我第一次在Go中进行编码，而没有使用GOPATH.
我有一个go.mod文件.
我正在尝试通过Sendgrid发送电子邮件；我有一个包含我的SENDGRID_API_KEY的文件，名为sendgrid.env.
当尝试使用我的main.go文件中的密钥时，该值未通过.

This is my first time coding in Go without using GOPATH.
I have a go.mod file.
I'm attempting to send an email through Sendgrid; I have a file which contains my SENDGRID_API_KEY called sendgrid.env.
When trying to use the key within my main.go file, the value isn't being pulled through.

fmt.Println(os.LookupEnv("SENDGRID_API_KEY")) // empty string 
fmt.Println(os.Getenv("SENDGRID_API_KEY")) // empty string

我还使用了'LookupEnv'，它返回false.
任何帮助，将不胜感激.

I've also used 'LookupEnv' which returns false.
Any help would be appreciated.

推荐答案

os.Getenv() 和 os.LookupEnv() 不会检查文件.如果您的环境变量在文件中，则必须自己加载它们.或者使用为您执行此操作的第三方库，例如 github.com/joho/godotenv ，如下所示:

os.Getenv() and os.LookupEnv() do not check files. If your env vars are in files, you have to load them yourself. Or use a 3rd party lib that does that for you, e.g. github.com/joho/godotenv, which would look like this:

if err := godotenv.Load("sendgrid.env"); err != nil {
    log.Fatal("Error loading sendgrid.env file")
}

另一种选择是在启动您的应用程序之前导出环境变量，例如:

Another option is to export the env vars before launching your app, e.g.:

export SENDGRID_API_KEY=mykey
./mygoapp

或一行:

SENDGRID_API_KEY=mykey ./mygoapp

或者，如果文件中包含环境变量，则可以使用source命令:

Or if you have the env vars in a file, you may use the source command:

source sendgrid.env
./mygoapp

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