/
serde_json.rs
33 lines (29 loc) · 969 Bytes
/
serde_json.rs
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use serde::Deserialize;
use serde_json;
use serde_with_expand_env::with_expand_envs;
use std::env;
#[derive(Deserialize, Debug)]
struct Test {
#[serde(deserialize_with = "with_expand_envs")]
number: usize,
#[serde(deserialize_with = "with_expand_envs")]
string: String,
#[serde(deserialize_with = "with_expand_envs")]
with_defaut: String,
}
fn main() {
let serialized = r#"{
"number": "$NUMBER",
"string": "my string: $STRING",
"with_defaut": "${DEFAULT:-default_value}"
}"#;
env::set_var("NUMBER", "1337");
env::set_var("STRING", "hacker");
let deserialized: Test = serde_json::from_str(&serialized).unwrap();
println!("{:#?}", deserialized);
env::set_var("NUMBER", "42");
env::set_var("STRING", "life, the universe and everyhing");
env::set_var("DEFAULT", "marvin");
let deserialized: Test = serde_json::from_str(&serialized).unwrap();
println!("{:#?}", deserialized);
}