gie-client

A lightweight Rust client for GIE transparency APIs: AGSI and ALSI.

Features

• sync and async clients
• works with or without GIE_API_KEY
• proxy support
• typed query builder (GieQuery)
• pagination and time-series helpers
• optional polars integration
• optional chrono date backend

Installation

[dependencies]
gie-client = "0.1"

Quick Start (Sync)

use gie_client::GieQuery;
use gie_client::agsi::AgsiClient;

let client = std::env::var("GIE_API_KEY")
    .ok()
    .filter(|v| !v.trim().is_empty())
    .map(AgsiClient::new)
    .unwrap_or_else(AgsiClient::without_api_key);

let query = GieQuery::new()
    .country("DE")
    .try_date("2026-03-10")?
    .try_size(25)?;

let page = client.fetch_page(&query)?;
println!("rows={}", page.data.len());

Quick Start (Async)

use gie_client::GieQuery;
use gie_client::alsi::AlsiAsyncClient;

let http = reqwest::Client::new();
let client = std::env::var("GIE_API_KEY")
    .ok()
    .filter(|v| !v.trim().is_empty())
    .map(|key| AlsiAsyncClient::with_http_client(key, http.clone()))
    .unwrap_or_else(|| AlsiAsyncClient::with_http_client_without_api_key(http));

let query = GieQuery::new()
    .country("FR")
    .try_range("2026-03-01", "2026-03-10")?
    .try_size(200)?;

let series = client.fetch_time_series(&query).await?;
println!("series={}", series.len());

Common Options

Proxy:

let client = gie_client::agsi::AgsiClient::with_proxy_without_api_key("http://127.0.0.1:8080")?;

Debug requests:

let client = gie_client::agsi::AgsiClient::without_api_key().with_debug_requests(true);

Rate limit (default is enabled: 60 req/min, 60s cooldown on 429):

let client = gie_client::agsi::AgsiClient::without_api_key()
    .with_rate_limit(std::num::NonZeroU32::new(30).unwrap());

let client_no_limit = gie_client::agsi::AgsiClient::without_api_key().without_rate_limit();

Custom User-Agent:

let client = gie_client::agsi::AgsiClient::without_api_key().with_user_agent("MyApp/1.0");

Examples

cargo run --example agsi_snapshot_sync
cargo run --example alsi_time_series_sync
cargo run --example alsi_time_series_async_external_client
cargo run --example alsi_time_series_polars --features polars

Environment variables used by examples:

• GIE_API_KEY
• GIE_PROXY_URL
• GIE_USER_AGENT