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zinclabs/dotenv-config

Dot Env Config

use .env as config file and parse environments to config struct.

Usage

derive EnvConfig

```rust use dotenv::dotenv; use dotenv_config::EnvConfig;

[derive(Debug, EnvConfig)]

struct Config { #[envconfig(default = "192.168.2.1")] serveraddr: String, servermode: bool, #[envconfig(name = "ZINCFOO", default = true)] foo: bool, #[envconfig(name = "ZINC_BAR", default = 123456)] bar: Option, }

fn main() { dotenv().ok(); let cfg = Config::init().unwrap(); println!("{:#?}", cfg); } ```

attribute env_config

you can use macro attribute set field attribute

• name: change default environment key
• default: if not set, used as default value

you can though system environments or .env file config it.

ZINC_FOO=false ZINC_BAR=8787878

default load environment key is: structName_fieldName do UpperSnake, like above struct, default config key is:

CONFIG_SERVER_ADDR CONFIG_SERVER_MODE ZINC_FOO ZINC_BAR

Added feature

Allows the usage of external function to post-process the field value once it get parsed.

For example we can pass an environment variable with an aws ARN for a secret manager, so once the value of the arn has been parsed, the added function specified in ext_post_with will retrieve the value from aws.

Usage

```rust use dotenv::dotenv; use dotenv_config::EnvConfig;

fn ssm_client(s: String) -> Result

[derive(Debug, EnvConfig)]

struct Config { #[envconfig(default = "192.168.2.1", ext=true, extpostwith="ssmclient")] serveraddr: String, servermode: bool, #[envconfig(name = "ZINCFOO", default = true)] foo: bool, #[envconfig(name = "ZINCBAR", default = 123456)] bar: Option, }

[tokio::main]

async fn main() { dotenv().ok(); let cfg = Config::init().await.unwrap(); println!("{:#?}", cfg); } ```

Attributes

ext: bool enable or disable feature.

ext_post_with: String required if ext is true.

The attribute ext_post_with receive a function name as a string, the function passed must have the following signature:

rust async fn func(_: String) -> Result<String, E>;