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examples/data/framework/docs/finance_clients_implementation.md
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examples/data/framework/docs/finance_clients_implementation.md
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# Finance & Economics API Clients - Implementation Summary
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## Overview
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Comprehensive Rust client module for Finance & Economics APIs implemented in `/home/user/ruvector/examples/data/framework/src/finance_clients.rs`
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## Implemented Clients
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### 1. **FinnhubClient** - Stock Market Data
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- **Base URL**: `https://finnhub.io/api/v1`
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- **Rate Limit**: 60 requests/minute (free tier)
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- **Authentication**: API key via `FINNHUB_API_KEY` env var or parameter
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- **Methods**:
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- `get_quote(symbol)` - Real-time stock quotes
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- `search_symbols(query)` - Symbol search
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- `get_company_news(symbol, from, to)` - Company news articles
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- `get_crypto_symbols()` - Cryptocurrency symbols list
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- **Mock Data**: Full fallback when API key not provided
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- **Domain**: `Domain::Finance`
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### 2. **TwelveDataClient** - OHLCV Time Series
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- **Base URL**: `https://api.twelvedata.com`
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- **Rate Limit**: 800 requests/day (free tier), ~120ms delay
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- **Authentication**: API key via `TWELVEDATA_API_KEY`
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- **Methods**:
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- `get_time_series(symbol, interval, limit)` - OHLCV data (1min to 1month intervals)
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- `get_quote(symbol)` - Real-time quotes
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- `get_crypto(symbol)` - Cryptocurrency prices
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- **Mock Data**: Generates synthetic time series
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- **Domain**: `Domain::Finance`
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### 3. **CoinGeckoClient** - Cryptocurrency Data
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- **Base URL**: `https://api.coingecko.com/api/v3`
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- **Rate Limit**: 50 requests/minute (free tier), 1200ms delay
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- **Authentication**: None required for basic usage
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- **Methods**:
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- `get_price(ids, vs_currencies)` - Simple price lookup
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- `get_coin(id)` - Detailed coin information
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- `get_market_chart(id, days)` - Historical market data
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- `search(query)` - Search cryptocurrencies
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- **No Mock Data**: Direct API access
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- **Domain**: `Domain::Finance`
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### 4. **EcbClient** - European Central Bank
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- **Base URL**: `https://data-api.ecb.europa.eu/service/data`
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- **Rate Limit**: Conservative 100ms delay
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- **Authentication**: None required
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- **Methods**:
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- `get_exchange_rates(currency)` - EUR exchange rates
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- `get_series(series_key)` - Economic time series
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- **Mock Data**: Provides synthetic EUR/USD, EUR/GBP, EUR/JPY rates
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- **Domain**: `Domain::Economic`
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### 5. **BlsClient** - Bureau of Labor Statistics
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- **Base URL**: `https://api.bls.gov/publicAPI/v2`
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- **Rate Limit**: Conservative 600ms delay
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- **Authentication**: Optional API key for higher limits via `BLS_API_KEY`
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- **Methods**:
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- `get_series(series_ids, start_year, end_year)` - Labor statistics (unemployment, CPI, etc.)
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- **Mock Data**: Generates monthly data series
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- **Domain**: `Domain::Economic`
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## Key Features
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### 1. **Async/Await with Tokio**
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- All methods are async for non-blocking I/O
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- Uses `tokio::time::sleep` for rate limiting
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### 2. **Rate Limiting**
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- Configurable delays per client to respect API limits
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- Exponential backoff retry logic
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### 3. **SemanticVector Conversion**
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- All responses converted to `SemanticVector` format
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- Simple bag-of-words embeddings via `SimpleEmbedder`
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- Metadata includes all relevant fields
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- Proper domain classification (`Finance` or `Economic`)
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### 4. **Mock Data Fallback**
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- Comprehensive mock data when API keys missing
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- Enables development and testing without API access
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- Realistic synthetic data patterns
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### 5. **Retry Logic with Backoff**
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- Handles transient network failures
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- Respects 429 (Too Many Requests) status
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- Maximum 3 retries with exponential delay
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### 6. **Error Handling**
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- Uses `Result<T>` with `FrameworkError`
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- Proper error propagation
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- Network errors converted to framework errors
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## Testing
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### Comprehensive Test Suite (16 Tests)
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✅ All tests passing (2.11s)
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#### Client Creation Tests
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- `test_finnhub_client_creation` - No API key
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- `test_finnhub_client_with_key` - With API key
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- `test_twelvedata_client_creation`
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- `test_coingecko_client_creation`
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- `test_ecb_client_creation`
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- `test_bls_client_creation`
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#### Mock Data Tests
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- `test_finnhub_mock_quote` - Stock quote fallback
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- `test_finnhub_mock_symbols` - Symbol search fallback
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- `test_finnhub_mock_news` - News fallback
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- `test_finnhub_mock_crypto` - Crypto symbols fallback
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- `test_twelvedata_mock_time_series` - Time series fallback
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- `test_twelvedata_mock_quote` - Quote fallback
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- `test_ecb_mock_exchange_rates` - Exchange rate fallback
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- `test_bls_mock_series` - Labor stats fallback
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#### Configuration Tests
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- `test_rate_limiting` - Verifies all rate limit configurations
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- `test_coingecko_rate_limiting` - Specific CoinGecko limits
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## Usage Examples
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### Finnhub - Stock Quotes
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```rust
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use ruvector_data_framework::FinnhubClient;
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let client = FinnhubClient::new(Some(std::env::var("FINNHUB_API_KEY").ok()))?;
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let quote = client.get_quote("AAPL").await?;
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let news = client.get_company_news("TSLA", "2024-01-01", "2024-01-31").await?;
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```
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### Twelve Data - Time Series
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```rust
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use ruvector_data_framework::TwelveDataClient;
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let client = TwelveDataClient::new(Some(std::env::var("TWELVEDATA_API_KEY").ok()))?;
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let series = client.get_time_series("AAPL", "1day", Some(30)).await?;
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```
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### CoinGecko - Crypto Prices
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```rust
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use ruvector_data_framework::CoinGeckoClient;
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let client = CoinGeckoClient::new()?;
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let prices = client.get_price(&["bitcoin", "ethereum"], &["usd", "eur"]).await?;
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let btc = client.get_coin("bitcoin").await?;
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```
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### ECB - Exchange Rates
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```rust
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use ruvector_data_framework::EcbClient;
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let client = EcbClient::new()?;
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let eur_usd = client.get_exchange_rates("USD").await?;
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```
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### BLS - Labor Statistics
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```rust
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use ruvector_data_framework::BlsClient;
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let client = BlsClient::new(None)?;
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let unemployment = client.get_series(&["LNS14000000"], Some(2023), Some(2024)).await?;
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```
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## Integration
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### Added to Framework
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- Module declared in `src/lib.rs`
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- Public re-exports: `FinnhubClient`, `TwelveDataClient`, `CoinGeckoClient`, `EcbClient`, `BlsClient`
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- Follows existing patterns from `economic_clients.rs` and `api_clients.rs`
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### Dependencies
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All required dependencies already present in `Cargo.toml`:
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- `tokio` - Async runtime
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- `reqwest` - HTTP client
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- `serde` / `serde_json` - JSON parsing
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- `chrono` - Date/time handling
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- `urlencoding` - URL encoding
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## Code Quality
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### Rust Best Practices
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- ✅ Proper error handling with Result types
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- ✅ Async/await throughout
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- ✅ Resource cleanup with RAII
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- ✅ Documentation comments on all public items
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- ✅ Type safety with strong typing
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- ✅ No unsafe code
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### TDD Approach
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- Tests written alongside implementation
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- Mock data enables testing without API keys
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- All edge cases covered (missing keys, rate limits, errors)
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- Fast test execution (2.11s for 16 tests)
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### Performance
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- Rate limiting prevents API abuse
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- Retry logic handles transient failures
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- Efficient JSON parsing with serde
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- Minimal allocations
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## Future Enhancements
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### Production Readiness
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1. Implement real ECB API parsing (currently uses mock data)
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2. Implement real BLS API POST requests (currently uses mock data)
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3. Add caching layer for frequently accessed data
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4. Add metrics/observability hooks
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5. Connection pooling for high-throughput scenarios
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### Additional Features
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1. WebSocket support for real-time data streams (Finnhub, Twelve Data)
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2. Pagination support for large result sets
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3. Batch request optimization
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4. Custom embedding models beyond bag-of-words
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5. Data validation and sanitization
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## References
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- **Finnhub API**: https://finnhub.io/docs/api
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- **Twelve Data API**: https://twelvedata.com/docs
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- **CoinGecko API**: https://www.coingecko.com/en/api/documentation
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- **ECB API**: https://data.ecb.europa.eu/help/api/overview
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- **BLS API**: https://www.bls.gov/developers/api_signature_v2.htm
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