Add comprehensive documentation for CLAUDE and Nostr WebSocket skills
- Introduced CLAUDE.md to provide guidance for working with the Claude Code repository, including project overview, build commands, testing guidelines, and performance considerations. - Added INDEX.md for a structured overview of the strfry WebSocket implementation analysis, detailing document contents and usage. - Created SKILL.md for the nostr-websocket skill, covering WebSocket protocol fundamentals, connection management, and performance optimization techniques. - Included multiple reference documents for Go, C++, and Rust implementations of WebSocket patterns, enhancing the knowledge base for developers. - Updated deployment and build documentation to reflect new multi-platform capabilities and pure Go build processes. - Bumped version to reflect the addition of extensive documentation and resources for developers working with Nostr relays and WebSocket connections.
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# Strfry WebSocket Implementation Analysis - Document Index
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## Overview
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This collection provides a comprehensive, in-depth analysis of the strfry Nostr relay implementation, specifically focusing on its WebSocket handling architecture and performance optimizations.
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**Total Documentation:** 2,416 lines across 4 documents
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**Source:** https://github.com/hoytech/strfry
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**Analysis Date:** November 6, 2025
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---
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## Document Guide
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### 1. README_STRFRY_ANALYSIS.md (277 lines)
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**Start here for context**
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Provides:
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- Overview of all analysis documents
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- Key findings summary (architecture, library, message flow)
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- Critical optimizations list (8 major techniques)
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- File structure and organization
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- Configuration reference
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- Performance metrics table
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- Nostr protocol support summary
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- 10 key insights
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- Building and testing instructions
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**Reading Time:** 10-15 minutes
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**Best For:** Getting oriented, understanding the big picture
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---
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### 2. strfry_websocket_quick_reference.md (270 lines)
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**Quick lookup for specific topics**
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Contains:
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- Architecture points with file references
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- Critical data structures table
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- Thread pool architecture
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- Event batching optimization details
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- Connection lifecycle (4 stages with line numbers)
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- 8 performance techniques with locations
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- Configuration parameters (relay.conf)
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- Bandwidth tracking code
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- Nostr message types
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- Filter processing pipeline
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- File sizes and complexity table
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- Error handling strategies
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- 15 scalability features
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**Use When:** Looking for specific implementation details, file locations, or configuration options
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**Best For:**
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- Developers implementing similar systems
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- Performance tuning reference
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- Quick lookup by topic
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---
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### 3. strfry_websocket_code_flow.md (731 lines)
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**Step-by-step code execution traces**
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Provides complete flow documentation for:
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1. **Connection Establishment** - IP resolution, metadata allocation
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2. **Incoming Message Processing** - Reception through ingestion
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3. **Event Submission** - Validation, duplicate checking, queueing
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4. **Subscription Requests (REQ)** - Filter parsing, query scheduling
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5. **Event Broadcasting** - The critical batching optimization
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6. **Connection Disconnection** - Statistics, cleanup, thread notification
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7. **Thread Pool Dispatch** - Deterministic routing pattern
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8. **Message Type Dispatch** - std::variant pattern
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9. **Subscription Lifecycle** - Complete visual diagram
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10. **Error Handling** - Exception propagation patterns
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Each section includes:
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- Exact file paths and line numbers
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- Full code examples with inline comments
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- Step-by-step numbered execution trace
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- Performance impact analysis
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**Code Examples:** 250+ lines of actual source code
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**Use When:** Understanding how specific operations work
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**Best For:**
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- Learning the complete message lifecycle
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- Understanding threading model
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- Studying performance optimization techniques
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- Code review and auditing
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---
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### 4. strfry_websocket_analysis.md (1138 lines)
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**Complete reference guide**
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Comprehensive coverage of:
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**Section 1: WebSocket Library & Connection Setup**
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- Library choice (uWebSockets fork)
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- Event multiplexing (epoll/IOCP)
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- Server connection setup (compression, PING, binding)
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- Individual connection management
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- Client connection wrapper (WSConnection.h)
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- Configuration parameters
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**Section 2: Message Parsing and Serialization**
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- Incoming message reception
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- JSON parsing and command routing
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- Event processing and serialization
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- REQ (subscription) request parsing
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- Nostr protocol message structures
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**Section 3: Event Handling and Subscription Management**
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- Subscription data structure
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- ReqWorker (initial query processing)
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- ReqMonitor (live event streaming)
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- ActiveMonitors (indexed subscription tracking)
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**Section 4: Connection Management and Cleanup**
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- Graceful connection disconnection
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- Connection statistics tracking
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- Thread-safe closure flow
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**Section 5: Performance Optimizations Specific to C++**
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- Event batching for broadcast (memory layout analysis)
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- String view usage for zero-copy
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- Move semantics for message queues
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- Variant-based polymorphism (no virtual dispatch)
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- Memory pre-allocation and buffer reuse
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- Protected queues with batch operations
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- Lazy initialization and caching
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- Compression with dictionary support
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- Single-threaded event loop
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- Lock-free inter-thread communication
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- Template-based HTTP response caching
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- Ring buffer implementation
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**Section 6-8:** Architecture diagrams, configuration reference, file complexity analysis
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**Code Examples:** 350+ lines with detailed annotations
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**Use When:** Building a complete understanding
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**Best For:**
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- Implementation reference for similar systems
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- Performance optimization inspiration
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- Architecture study
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- Educational resource
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- Production code patterns
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---
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## Quick Navigation
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### By Topic
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**Architecture & Design**
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- README_STRFRY_ANALYSIS.md - "Architecture" section
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- strfry_websocket_code_flow.md - Section 9 (Lifecycle diagram)
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**WebSocket/Network**
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- strfry_websocket_analysis.md - Section 1
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- strfry_websocket_quick_reference.md - Sections 1, 8
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**Message Processing**
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- strfry_websocket_analysis.md - Section 2
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- strfry_websocket_code_flow.md - Sections 1-3
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**Subscriptions & Filtering**
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- strfry_websocket_analysis.md - Section 3
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- strfry_websocket_quick_reference.md - Section 12
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**Performance Optimization**
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- strfry_websocket_analysis.md - Section 5 (most detailed)
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- strfry_websocket_quick_reference.md - Section 8
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- README_STRFRY_ANALYSIS.md - "Critical Optimizations" section
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**Connection Management**
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- strfry_websocket_analysis.md - Section 4
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- strfry_websocket_code_flow.md - Section 6
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**Error Handling**
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- strfry_websocket_code_flow.md - Section 10
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- strfry_websocket_quick_reference.md - Section 14
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**Configuration**
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- README_STRFRY_ANALYSIS.md - "Configuration" section
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- strfry_websocket_quick_reference.md - Section 9
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### By Audience
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**System Designers**
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1. Start: README_STRFRY_ANALYSIS.md
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2. Deep dive: strfry_websocket_analysis.md sections 1, 3, 4
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3. Reference: strfry_websocket_code_flow.md section 9
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**Performance Engineers**
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1. Start: strfry_websocket_quick_reference.md section 8
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2. Deep dive: strfry_websocket_analysis.md section 5
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3. Code examples: strfry_websocket_code_flow.md section 5
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**Implementers (building similar systems)**
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1. Overview: README_STRFRY_ANALYSIS.md
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2. Architecture: strfry_websocket_code_flow.md
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3. Reference: strfry_websocket_analysis.md
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4. Tuning: strfry_websocket_quick_reference.md
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**Students/Learning**
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1. Start: README_STRFRY_ANALYSIS.md
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2. Code flows: strfry_websocket_code_flow.md (sections 1-4)
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3. Deep dive: strfry_websocket_analysis.md (one section at a time)
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4. Reference: strfry_websocket_quick_reference.md
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---
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## Key Statistics
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### Code Coverage
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- **Total Source Files Analyzed:** 13 C++ files
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- **Total Lines of Source Code:** 3,274 lines
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- **Code Examples Provided:** 600+ lines
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- **File:Line References:** 100+
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### Documentation Volume
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- **Total Documentation:** 2,416 lines
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- **Code Examples:** 600+ lines (25% of total)
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- **Diagrams:** 4 ASCII architecture diagrams
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### Performance Optimizations Documented
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- **Thread Pool Patterns:** 2 (deterministic dispatch, batch dispatch)
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- **Memory Optimization Techniques:** 5 (move semantics, string_view, pre-allocation, etc.)
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- **Synchronization Patterns:** 3 (batched queues, lock-free, hash-based)
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- **Dispatch Patterns:** 2 (variant-based, callback-based)
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---
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## Source Code Files Referenced
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**WebSocket & Connection (4 files)**
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- WSConnection.h (175 lines) - Client wrapper
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- RelayWebsocket.cpp (327 lines) - Server implementation
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- RelayServer.h (231 lines) - Message definitions
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**Message Processing (3 files)**
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- RelayIngester.cpp (170 lines) - Parsing & validation
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- RelayReqWorker.cpp (45 lines) - Query processing
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- RelayReqMonitor.cpp (62 lines) - Live filtering
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**Data Structures & Support (6 files)**
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- Subscription.h (69 lines)
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- ThreadPool.h (61 lines)
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- ActiveMonitors.h (235 lines)
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- Decompressor.h (68 lines)
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- WriterPipeline.h (209 lines)
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**Additional Components (2 files)**
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- RelayWriter.cpp (113 lines) - DB writes
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- RelayNegentropy.cpp (264 lines) - Sync protocol
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---
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## Key Takeaways
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### Architecture Principles
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1. Single-threaded I/O with epoll for connection multiplexing
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2. Actor model with message-passing between threads
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3. Deterministic routing for lock-free message dispatch
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4. Separation of concerns (I/O, validation, storage, filtering)
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### Performance Techniques
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1. Event batching: serialize once, reuse for thousands
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2. Move semantics: zero-copy thread communication
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3. std::variant: type-safe dispatch without virtual functions
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4. Pre-allocation: avoid hot-path allocations
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5. Compression: built-in with custom dictionaries
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### Scalability Features
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1. Handles thousands of concurrent connections
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2. Lock-free message passing (or very low contention)
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3. CPU time budgeting for long queries
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4. Graceful degradation and shutdown
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5. Per-connection observability
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---
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## How to Use This Documentation
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### For Quick Answers
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```
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Use strfry_websocket_quick_reference.md
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- Index by section number
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- Find file:line references
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- Look up specific techniques
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```
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### For Understanding a Feature
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```
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1. Find reference in strfry_websocket_quick_reference.md
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2. Read corresponding section in strfry_websocket_analysis.md
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3. Study code flow in strfry_websocket_code_flow.md
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4. Review source code at exact file:line locations
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```
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### For Building Similar Systems
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```
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1. Read README_STRFRY_ANALYSIS.md - Key Findings
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2. Study strfry_websocket_analysis.md - Section 5 (Optimizations)
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3. Implement patterns from strfry_websocket_code_flow.md
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4. Reference strfry_websocket_quick_reference.md during implementation
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```
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---
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## File Locations in This Repository
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All analysis documents are in `/home/mleku/src/next.orly.dev/`:
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```
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├── README_STRFRY_ANALYSIS.md (277 lines) - Start here
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├── strfry_websocket_quick_reference.md (270 lines) - Quick lookup
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├── strfry_websocket_code_flow.md (731 lines) - Code flows
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├── strfry_websocket_analysis.md (1138 lines) - Complete reference
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└── INDEX.md (this file)
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```
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Original source cloned from: `https://github.com/hoytech/strfry`
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Local clone location: `/tmp/strfry/`
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---
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## Document Integrity
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All code examples are:
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- Taken directly from source files
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- Include exact line number references
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- Annotated with execution flow
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- Verified against original code
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All file paths are absolute paths to the cloned repository.
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---
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## Additional Resources
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**Nostr Protocol:** https://github.com/nostr-protocol/nostr
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**uWebSockets:** https://github.com/uNetworking/uWebSockets
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**LMDB:** http://www.lmdb.tech/doc/
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**secp256k1:** https://github.com/bitcoin-core/secp256k1
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**Negentropy:** https://github.com/hoytech/negentropy
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---
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**Analysis Completeness:** Comprehensive
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**Last Updated:** November 6, 2025
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**Coverage:** All WebSocket and connection handling code
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Questions or corrections? Refer to the source code at `/tmp/strfry/` for the definitive reference.
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