mirror of https://github.com/mastodon/flodgatt
121 lines
3.5 KiB
Rust
121 lines
3.5 KiB
Rust
use hashbrown::HashMap;
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use std::fmt;
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#[derive(Debug)]
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pub struct EnvVar(pub HashMap<String, String>);
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impl std::ops::Deref for EnvVar {
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type Target = HashMap<String, String>;
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fn deref(&self) -> &HashMap<String, String> {
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&self.0
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}
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}
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impl Clone for EnvVar {
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fn clone(&self) -> Self {
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Self(self.0.clone())
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}
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}
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impl EnvVar {
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pub fn new(vars: HashMap<String, String>) -> Self {
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Self(vars)
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}
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pub fn maybe_add_env_var(&mut self, key: &str, maybe_value: Option<impl ToString>) {
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if let Some(value) = maybe_value {
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self.0.insert(key.to_string(), value.to_string());
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}
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}
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}
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impl fmt::Display for EnvVar {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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let mut result = String::new();
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for env_var in &[
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"NODE_ENV",
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"RUST_LOG",
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"BIND",
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"PORT",
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"SOCKET",
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"SSE_FREQ",
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"WS_FREQ",
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"DATABASE_URL",
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"DB_USER",
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"USER",
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"DB_PORT",
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"DB_HOST",
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"DB_PASS",
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"DB_NAME",
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"DB_SSLMODE",
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"REDIS_HOST",
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"REDIS_USER",
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"REDIS_PORT",
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"REDIS_PASSWORD",
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"REDIS_USER",
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"REDIS_DB",
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"REDIS_FREQ",
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] {
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if let Some(value) = self.get(&(*env_var).to_string()) {
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result = format!("{}\n {}: {}", result, env_var, value)
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}
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}
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write!(f, "{}", result)
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}
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}
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#[macro_export]
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macro_rules! maybe_update {
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($name:ident; $item: tt:$type:ty) => (
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pub fn $name(self, item: Option<$type>) -> Self {
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match item {
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Some($item) => Self{ $item, ..self },
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None => Self { ..self }
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}
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});
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($name:ident; Some($item: tt: $type:ty)) => (
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fn $name(self, item: Option<$type>) -> Self{
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match item {
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Some($item) => Self{ $item: Some($item), ..self },
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None => Self { ..self }
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}
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})}
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#[macro_export]
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macro_rules! from_env_var {
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($(#[$outer:meta])*
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let name = $name:ident;
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let default: $type:ty = $inner:expr;
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let (env_var, allowed_values) = ($env_var:tt, $allowed_values:expr);
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let from_str = |$arg:ident| $body:expr;
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) => {
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#[derive(Clone)]
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pub struct $name(pub $type);
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impl std::fmt::Debug for $name {
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fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
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write!(f, "{:?}", self.0)
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}
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}
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impl std::ops::Deref for $name {
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type Target = $type;
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fn deref(&self) -> &$type {
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&self.0
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}
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}
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impl std::default::Default for $name {
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fn default() -> Self {
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$name($inner)
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}
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}
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impl $name {
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fn inner_from_str($arg: &str) -> Option<$type> {
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$body
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}
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pub fn maybe_update(self, var: Option<&String>) -> Result<Self, crate::err::FatalErr> {
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Ok(match var {
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Some(empty_string) if empty_string.is_empty() => Self::default(),
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Some(value) => Self(Self::inner_from_str(value).ok_or_else(|| {
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crate::err::FatalErr::config($env_var, value, $allowed_values)
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})?),
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None => self,
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})
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}
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}
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};
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}
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