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Read config vars from files

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janost 2020-11-29 02:31:49 +01:00
commit e8ef76b8f9
1 changed files with 21 additions and 4 deletions
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25
src/util.rs
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@ -283,20 +283,37 @@ where
use std::env;
pub fn get_env_str_value(key: &str) -> Option<String>
{
let key_file = format!("{}_FILE", key);
let value_from_env = env::var(key);
let value_file = env::var(&key_file);
match (value_from_env, value_file) {
(Ok(_), Ok(_)) => panic!("You should not define both {} and {}!", key, key_file),
(Ok(v_env), Err(_)) => Some(v_env),
(Err(_), Ok(v_file)) => match fs::read_to_string(v_file) {
Ok(content) => Some(content.trim().to_string()),
Err(e) => panic!("Failed to load {}: {:?}", key, e)
},
_ => None
}
}
pub fn get_env<V>(key: &str) -> Option<V>
where
V: FromStr,
{
try_parse_string(env::var(key).ok())
try_parse_string(get_env_str_value(key))
}
const TRUE_VALUES: &[&str] = &["true", "t", "yes", "y", "1"];
const FALSE_VALUES: &[&str] = &["false", "f", "no", "n", "0"];
pub fn get_env_bool(key: &str) -> Option<bool> {
match env::var(key) {
Ok(val) if TRUE_VALUES.contains(&val.to_lowercase().as_ref()) => Some(true),
Ok(val) if FALSE_VALUES.contains(&val.to_lowercase().as_ref()) => Some(false),
match get_env_str_value(key) {
Some(val) if TRUE_VALUES.contains(&val.to_lowercase().as_ref()) => Some(true),
Some(val) if FALSE_VALUES.contains(&val.to_lowercase().as_ref()) => Some(false),
_ => None,
}
}