httpcan 0.6.0

A simple HTTP Request & Response Service, with httpbin compatibility
Documentation 
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use super::*;
use serde_json::Value;
use std::collections::BTreeMap;

/// Liveness / health probe for orchestrators (httpbin #544).
pub async fn healthz_handler() -> Result<HttpResponse> {
    Ok(HttpResponse::Ok().json(json!({ "status": "ok" })))
}

/// Return all `HTTPCAN_*` environment variables (prefix stripped), sorted by
/// key. Used for instance identification behind load balancers (httpbin #565).
pub async fn tags_handler() -> Result<HttpResponse> {
    let tags: BTreeMap<String, String> = std::env::vars()
        .filter_map(|(k, v)| k.strip_prefix("HTTPCAN_").map(|s| (s.to_string(), v)))
        .collect();
    Ok(HttpResponse::Ok().json(tags))
}

/// Return a single tag value by name (httpbin #565).
pub async fn tag_value_handler(path: web::Path<String>) -> Result<HttpResponse> {
    let name = path.into_inner();
    match std::env::var(format!("HTTPCAN_{name}")) {
        Ok(value) => {
            let mut map = serde_json::Map::new();
            map.insert(name, Value::String(value));
            Ok(HttpResponse::Ok().json(Value::Object(map)))
        }
        Err(_) => Ok(HttpResponse::NotFound().json(json!({}))),
    }
}