fugle-marketdata

Rust SDK for Fugle market data. Provides REST API and WebSocket clients for Taiwan stock and futures/options market data.

Features

• REST Client: Synchronous HTTP client for market data queries
  • Stock intraday data (quote, ticker, candles, trades, volumes)
  • FutOpt (futures/options) intraday data
• WebSocket Client: Async real-time streaming
  • Stock channels: trades, candles, books, aggregates, indices
  • FutOpt channels: trades, candles, books, aggregates
  • Automatic reconnection with exponential backoff
  • Health check monitoring
• Authentication: API key, bearer token, or SDK token

Installation

cargo add fugle-marketdata
cargo add tokio --features rt-multi-thread,macros

Quick Start

REST API

use fugle_marketdata::{RestClient, Auth};

# fn main() -> Result<(), fugle_marketdata::MarketDataError> {
let client = RestClient::new(Auth::ApiKey(
    std::env::var("FUGLE_API_KEY").expect("FUGLE_API_KEY not set")
));

// Stock quote
let quote = client.stock().intraday().quote().symbol("2330").send()?;
println!("TSMC close price: {:?}", quote.close_price);

// Intraday candles (5-minute)
let candles = client.stock().intraday().candles()
    .symbol("2330")
    .timeframe("5")
    .send()?;
println!("Candles: {} entries", candles.data.len());

// FutOpt quote
let futopt_quote = client.futopt().intraday().quote()
    .symbol("TXFC4")
    .send()?;
println!("Futures close price: {:?}", futopt_quote.close_price);
# Ok(())
# }

WebSocket Streaming

use fugle_marketdata::{
    AuthRequest, Channel, WebSocketClient,
    websocket::{ConnectionConfig, StockSubscription},
};
use std::time::Duration;

# async fn run() -> Result<(), fugle_marketdata::MarketDataError> {
let config = ConnectionConfig::fugle_stock(
    AuthRequest::with_api_key(
        std::env::var("FUGLE_API_KEY").expect("FUGLE_API_KEY not set")
    )
);
let client = WebSocketClient::new(config);

client.connect().await?;
client.subscribe_channel(StockSubscription::new(Channel::Trades, "2330")).await?;
client.subscribe_channel(StockSubscription::new(Channel::Books, "2330")).await?;

let messages = client.messages();
for _ in 0..10 {
    // receive_timeout returns Result<Option<msg>, _>:
    //   Ok(Some(msg)) — message received
    //   Ok(None)      — timeout elapsed, no message
    //   Err(_)        — channel closed
    if let Ok(Some(msg)) = messages.receive_timeout(Duration::from_secs(5)) {
        if msg.is_data() {
            println!("Data: {:?} - {:?}", msg.channel, msg.symbol);
        }
    }
}

client.disconnect().await?;
# Ok(())
# }

Authentication

use fugle_marketdata::{Auth, AuthRequest};

// REST authentication
let _ = Auth::ApiKey("your-api-key".to_string());
let _ = Auth::BearerToken("your-bearer-token".to_string());
let _ = Auth::SdkToken("your-sdk-token".to_string());

// WebSocket authentication
let _ = AuthRequest::with_api_key("your-api-key");
let _ = AuthRequest::with_token("your-bearer-token");
let _ = AuthRequest::with_sdk_token("your-sdk-token");

Configuration

Reconnection

use fugle_marketdata::websocket::ReconnectionConfig;
use std::time::Duration;

# fn main() -> Result<(), Box<dyn std::error::Error>> {
let reconnect = ReconnectionConfig::new(
    10,                              // max_attempts
    Duration::from_millis(2_000),    // initial_delay (min 100ms)
    Duration::from_millis(120_000),  // max_delay
)?;
# drop(reconnect);
# Ok(())
# }

Health Check

The SDK uses passive activity detection at the WebSocket read site — no background task, no protocol-level pings. The dispatch loop wraps each ws_read.next() in tokio::time::timeout(heartbeat_timeout, ...) and emits ConnectionEvent::HeartbeatTimeout when the timer fires, which then triggers the auto-reconnect path.

use fugle_marketdata::websocket::HealthCheckConfig;
use std::time::Duration;

# fn main() -> Result<(), Box<dyn std::error::Error>> {
// Default: enabled=true, heartbeat_timeout=35s (server's 30s + 5s buffer)
let health = HealthCheckConfig::default();

// Custom timeout (the floor is 5s, but values below the live server's 30s
// heartbeat period will cause repeated false disconnects)
let health = HealthCheckConfig::with_timeout(Duration::from_secs(45))?;

// Opt out (discouraged — stalled connections won't surface until the OS
// times out the underlying TCP, typically hours later)
let health = HealthCheckConfig::disabled();
# drop(health);
# Ok(())
# }

Error Handling

All operations return Result<T, MarketDataError>:

use fugle_marketdata::{MarketDataError, RestClient, Auth};

# fn main() {
# let client = RestClient::new(Auth::ApiKey("key".into()));
match client.stock().intraday().quote().symbol("2330").send() {
    Ok(quote) => println!("Price: {:?}", quote.close_price),
    Err(MarketDataError::AuthError { msg }) => eprintln!("Auth failed: {}", msg),
    Err(MarketDataError::ApiError { status, message }) => eprintln!("API {}: {}", status, message),
    Err(MarketDataError::TimeoutError { operation }) => eprintln!("Timeout: {}", operation),
    Err(e) => eprintln!("Error: {}", e),
}
# }

Error codes (for FFI consumers):

API Reference

See the API documentation on docs.rs for the full type catalogue.

REST Endpoints

Stock intraday — client.stock().intraday():

• .quote() — real-time quote
• .ticker() — symbol information
• .candles() — OHLCV candles
• .trades() — trade history
• .volumes() — volume by price

FutOpt intraday — client.futopt().intraday():

• .quote(), .ticker(), .tickers(), .candles(), .trades(), .volumes(), .products()

WebSocket Channels

Architecture

fugle-marketdata is a thin facade over the fugle-marketdata-core kernel crate. The kernel is the same library used by the Python, Node.js, and other language bindings of the official Fugle SDK. End users should depend on fugle-marketdata; advanced users who need direct kernel access can depend on fugle-marketdata-core.

License

Licensed under either of Apache License, Version 2.0 or MIT license at your option.

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.