shiny_configuration/configuration_provider/
env_provider.rs

1use std::collections::HashMap;
2
3use crate::{
4    configuration_provider::ConfigurationProvider,
5    value::number::Number,
6    value::Value,
7};
8
9pub struct EnvironmentVariablesProvider {
10    prefix: Option<String>,
11}
12
13impl EnvironmentVariablesProvider {
14    pub fn new() -> Self {
15        EnvironmentVariablesProvider { prefix: None }
16    }
17
18    pub fn prefixed(prefix: impl ToString) -> Self {
19        EnvironmentVariablesProvider {
20            prefix: Some(prefix.to_string()),
21        }
22    }
23}
24
25impl ConfigurationProvider for EnvironmentVariablesProvider {
26    fn provide(&self) -> Value {
27        let map = std::env::vars()
28            .filter_map(|(k, v)| {
29                let key = match &self.prefix {
30                    Some(prefix) => match k.strip_prefix(prefix) {
31                        Some(trimmed) => trimmed.to_string(),
32                        None => return None,
33                    },
34                    None => k,
35                };
36
37                let value: Option<Value> = parse_env_var_value(&v);
38
39                Some((key, value.unwrap_or(Value::String(v))))
40            })
41            .collect::<HashMap<String, Value>>();
42
43        Value::Map(map)
44    }
45}
46
47fn parse_env_var_value(v: &str) -> Option<Value> {
48    if let Ok(parsed_value) = v.parse::<bool>() {
49        return Some(Value::Bool(parsed_value));
50    }
51
52    if let Ok(parsed_value) = v.parse::<u64>() {
53        return Some(Value::Number(Number::UInteger(parsed_value)));
54    }
55
56    if let Ok(parsed_value) = v.parse::<i64>() {
57        return Some(Value::Number(Number::Integer(parsed_value)));
58    }
59
60    if let Ok(parsed_value) = v.parse::<f64>() {
61        return Some(Value::Number(Number::Float(parsed_value)));
62    }
63
64    None
65}
shiny_configuration/configuration_provider/env_provider.rs

shiny_configuration/configuration_provider/
env_provider.rs
