# Project Architecture > High-level architecture and design patterns for the crypto-scout ecosystem Use when this capability is needed. - Skill: `tomevault-io/project-architecture-2` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/project-architecture-2` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/project-architecture-2/raw - Safety review: pending - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Coding & Dev Tools - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/project-architecture-2 --- ## What I Do Provide comprehensive guidance on the architecture, design patterns, and system interactions within the crypto-scout ecosystem. ## System Overview ```mermaid flowchart TB subgraph External["External APIs"] Bybit["Bybit API
WebSocket + REST"] CMC["CoinMarketCap API
REST"] end subgraph Library["Core Library"] JCL["jcryptolib v0.0.4
(Bybit Stream, CMC Parser,
Analysis Engine)"] end subgraph Messaging["RabbitMQ Messaging"] BS["bybit-stream"] CS["crypto-scout-stream"] CQ["collector-queue"] end subgraph Services["Microservices"] Client["crypto-scout-client v0.0.1
(Data Collection)"] Collector["crypto-scout-collector v0.0.1
(Data Persistence)"] Analyst["crypto-scout-analyst v0.0.1
(Analysis)"] end subgraph Storage["Data Storage"] DB[("TimescaleDB
Time-series data")] end Bybit -->|WebSocket| JCL CMC -->|REST| JCL JCL -->|Uses| Client Client -->|Publish| BS Client -->|Publish| CS BS -->|Consume| Collector CS -->|Consume| Collector Collector -->|JDBC| DB BS -->|Consume| Analyst CS -->|Consume| Analyst CQ -->|AMQP| Collector ``` ## Module Responsibilities ### jcryptolib (v0.0.4) **Purpose**: Core cryptocurrency library shared across all services **Components**: - **Bybit Streaming** (`bybit/stream/`): WebSocket client with resilience patterns - `BybitStream`: Main streaming class with auto-reconnect, ping/pong - `BybitParser`: REST API data fetching - `PingPongHandler`: WebSocket heartbeat management - `Requests`/`Responses`: Message builders/parsers - **CMC Parser** (`cmc/parser/`): REST API client with scheduling - `CmcParser`: Main parser with rate limiting - `CmcConfig`: Configuration management - **Analysis Engine** (`analysis/engine/`): Technical indicators - `AnalystEngine`: Main analysis orchestrator - `SmaIndicator`: Simple Moving Average - `EmaIndicator`: Exponential Moving Average - `BitcoinRiskIndicator`: BTC risk assessment - **Resilience** (`resilience/`): Circuit breaker, rate limiter, health checks - **Stream Abstractions** (`stream/`): Payload, Message, Provider, Source, Statistic - **Utils** (`util/`): JsonUtils, ParserUtils, TimeUtils, ValueUtils, SecUtils - **Exceptions** (`exception/`): 10 exception types with hierarchy **Usage**: Dependency for all other Java modules ### crypto-scout-test (v0.0.1) **Purpose**: Shared test utilities library **Components**: - `MockData`: Typed access to JSON test fixtures (bybit-spot, bybit-linear, crypto-scout) - `PodmanCompose`: Container lifecycle management - `StreamTestPublisher`/`StreamTestConsumer`: RabbitMQ Streams test utilities - `AmqpTestPublisher`/`AmqpTestConsumer`: AMQP test utilities - `DBUtils`: Database operations for tests - `Assertions`: Custom test assertions **Usage**: Test-scoped dependency in collector and analyst ### crypto-scout-client (v0.0.1) **Purpose**: Real-time market data collection **Data Sources**: - **Bybit Spot**: BTCUSDT, ETHUSDT (tickers, trades, order books, klines) - **Bybit Linear**: BTCUSDT, ETHUSDT (tickers, trades, liquidations, klines) - **CoinMarketCap**: Fear & Greed Index, BTC/USD quotes **Architecture**: ``` Client (Launcher) ├── CoreModule (Reactor, Executor) ├── WebModule (HTTP server, Health) ├── ClientModule (AmqpPublisher) ├── BybitSpotModule (WebSocket consumers) │ ├── BybitSpotBtcUsdtConsumer │ └── BybitSpotEthUsdtConsumer ├── BybitLinearModule (WebSocket consumers) │ ├── BybitLinearBtcUsdtConsumer │ └── BybitLinearEthUsdtConsumer ├── CmcParserModule (HTTP parser) │ └── CmcParserConsumer └── JmxModule (Monitoring) ``` **Publishing Strategy**: - Bybit data → `bybit-stream` - CMC data → `crypto-scout-stream` ### crypto-scout-collector (v0.0.1) **Purpose**: Data persistence and storage **Stream Consumers**: - `bybit-stream` → `BybitStreamService` - `crypto-scout-stream` → `CryptoScoutService` - `collector-queue` (AMQP) → `AmqpConsumer` **Data Flow**: ``` StreamService ├── BybitStreamService │ ├── BybitSpotRepository (spot tables) │ └── BybitLinearRepository (linear tables) └── CryptoScoutService └── CryptoScoutRepository (fgi, klines, risk) AmqpConsumer └── Command/Control messages ``` **Repositories**: - `BybitSpotRepository`: Spot market data - `BybitLinearRepository`: Linear/perp market data - `CryptoScoutRepository`: CMC/analysis data - `AnalystRepository`: Analyst-specific tables - `StreamOffsetsRepository`: Offset tracking **Offset Management**: DB-backed offsets for exactly-once processing ### crypto-scout-analyst (v0.0.1) **Purpose**: Market analysis and alerting **Architecture**: ``` Analyst (Launcher) ├── CoreModule (Reactor, Executor) ├── WebModule (HTTP server, Health) ├── AnalystModule (Analysis services) │ ├── StreamService │ │ ├── BybitStreamService │ │ └── CryptoScoutService │ ├── Stream transformers │ │ ├── BytesToPayloadTransformer │ │ └── AnalystTransformer │ ├── DataService (async processing) │ └── StreamPublisher (output) └── JmxModule (Monitoring) ``` **Stream Processing Pipeline**: ``` RabbitMQ Stream → Consumer → BytesToPayloadTransformer → AnalystTransformer → DataService → Output ``` **Components**: - `StreamService`: Orchestrates stream consumption - `CryptoScoutService`: Consumes from crypto-scout-stream with transformers - `BybitStreamService`: Consumes from bybit-stream - `DataService`: Processes payloads asynchronously - `AnalystTransformer`: Stream transformer for preprocessing - `StreamPublisher`: Output publisher ### crypto-scout-mq **Purpose**: Messaging infrastructure (not a Java module) **Components**: - RabbitMQ 4.1.4 with Streams and AMQP plugins - Pre-configured exchanges, queues, and streams - Stream retention policies (1 day, 2GB max) - Dead-letter exchange for failed messages **Streams**: | Stream | Purpose | Retention | |--------|---------|-----------| | `bybit-stream` | Bybit market data | 1 day, 2GB max | | `crypto-scout-stream` | CMC/parser data | 1 day, 2GB max | **Queues**: | Queue | Purpose | Arguments | |-------|---------|-----------| | `collector-queue` | Command/control messages | lazy mode, TTL 6h, max 2500 | | `chatbot-queue` | Chatbot notifications | lazy mode, TTL 6h, max 2500 | | `dlx-queue` | Dead letter handling | lazy mode, TTL 7d | **Deployment**: Podman Compose with persistent volumes ## Data Flow Patterns ### 1. Market Data Ingestion ``` Bybit WebSocket → crypto-scout-client → bybit-stream → crypto-scout-collector → TimescaleDB ``` ### 2. Metrics Collection ``` CMC REST API → crypto-scout-client → crypto-scout-stream → crypto-scout-collector → TimescaleDB ``` ### 3. Analysis Pipeline ``` Streams → crypto-scout-analyst → [Transformers] → DataService → Output/Alerts ``` ### 4. Command/Control ``` External → collector-queue (AMQP) → crypto-scout-collector → Action ``` ## Design Patterns ### 1. Launcher Pattern (ActiveJ) ```java public final class Service extends Launcher { @Override protected Module getModule() { return combine( CoreModule.create(), // Reactor + Executor ServiceModule.create(), // Service-specific WebModule.create() // HTTP + Health ); } @Override protected void run() throws Exception { awaitShutdown(); // Block until SIGTERM } } ``` ### 2. Reactive Service Pattern ```java public final class MyService extends AbstractReactive implements ReactiveService { @Override public Promise start() { return Promise.ofBlocking(executor, () -> { // Initialize resources }); } @Override public Promise stop() { return Promise.ofBlocking(executor, () -> { // Cleanup resources }); } } ``` ### 3. Repository Pattern ```java public final class DataRepository { private final DataSource dataSource; public void saveBatch(final List data) throws SQLException { try (final var conn = dataSource.getConnection(); final var stmt = conn.prepareStatement(SQL)) { for (final var d : data) { // set parameters stmt.addBatch(); } stmt.executeBatch(); } } } ``` ### 4. Stream Transformer Pattern ```java public final class AnalystTransformer extends AbstractStreamTransformer { @Override protected StreamDataAcceptor onResumed(final StreamDataAcceptor output) { return in -> { final var result = process(in); output.accept(result); }; } } ``` ### 5. Factory Pattern ```java public final class Service { public static Service create(final NioReactor reactor, final Executor executor) { return new Service(reactor, executor); } private Service(final NioReactor reactor, final Executor executor) { // Private constructor } } ``` ## Configuration Management ### Hierarchy 1. **Bundled defaults**: `src/main/resources/application.properties` 2. **Environment variables**: Override via env vars 3. **System properties**: Override via `-D` flags ### Property Naming ``` server.port → SERVER_PORT amqp.rabbitmq.host → AMQP_RABBITMQ_HOST jdbc.datasource.url → JDBC_DATASOURCE_URL ``` ### Pattern ```java static final String VALUE = System.getProperty("key", "default"); ``` ## Error Handling Strategy ### Service Level - Use `IllegalStateException` for invalid states - Chain exceptions with causes - Log errors with context ### Connection Level - Retry with exponential backoff - Circuit breaker pattern (jcryptolib) - Graceful degradation ### Data Level - Batch inserts with rollback - Offset tracking for recovery - Dead-letter queue for failures ## Scalability Considerations ### Horizontal Scaling - **Client**: Multiple instances (stateless) - **Collector**: Single instance per stream (offset management) - **Analyst**: Multiple instances (consumer groups possible) ### Vertical Scaling - **CPU**: Virtual threads for I/O bound work - **Memory**: Bounded queues and streams - **Storage**: Compression and retention policies ### Bottlenecks - Database write capacity - Network bandwidth - Message broker throughput ## Security Architecture ### Network - Internal network: `crypto-scout-bridge` - No external exposure for services - RabbitMQ management on localhost only ### Credentials - Environment variables for secrets - No hardcoded credentials - File permissions on secret files (600) ### Container Security - Non-root user (UID 10001) - Read-only root filesystem - Dropped capabilities - No new privileges ## Monitoring and Observability ### Health Checks ``` GET /health → "ok" (200) or "not-ready" (503) ``` ### Metrics - JMX via ActiveJ - Message throughput - Database connection pool - Error rates ### Logging - SLF4J with Logback - Structured logging - Correlation IDs ## Deployment Strategy ### Development ```bash # Local with Podman Compose podman-compose up -d # All services ``` ### Production ```bash # Individual service deployment podman-compose up -d crypto-scout-client podman-compose up -d crypto-scout-collector podman-compose up -d crypto-scout-analyst ``` ### Upgrade Process 1. Build new image 2. Health check on staging 3. Rolling update (stop old, start new) 4. Verify health endpoints ## When to Use Me Use this skill when: - Understanding the overall system architecture - Designing new features across modules - Planning service interactions - Considering scalability and deployment - Reviewing security implications - Troubleshooting cross-module issues - Documenting system behavior - Implementing stream processing pipelines --- > Converted and distributed by [TomeVault](https://tomevault.io/claim/akarazhev) — claim your Tome and manage your conversions.