websocket-relay/.agents/summary/index.md

Documentation Index — WebSocket Relay

Purpose: This file serves as the primary knowledge base entry point for AI assistants working with this codebase. Read this file first to understand where to find detailed information.

How to Use This Documentation

1. Start here — this index contains summaries of every documentation file
2. Check the summary tables below to determine which file has the information you need
3. Only load additional files when you need deeper detail on a specific topic
4. Cross-references are provided to help navigate between related topics

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Project Quick Reference

Fact	Value
Project	WebSocket Relay Server
Language	Go 1.21
Purpose	Broadcast WebSocket messages to all connected clients (P2P relay)
Entry Point	main.go
Config	config.yaml (YAML)
WebSocket Port	8443 (configurable)
Metrics Port	9090 (configurable, optional)
Build	make build / make release
Test	make test / go test ./...
Architecture	Hub-and-Spoke broadcast pattern using Go channels

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Documentation Files

📋 codebase_info.md

What it contains: Project metadata, directory tree, technology stack, build targets, and codebase statistics.
When to consult: When you need to understand the project layout, find a file, or check what tools/languages are used.
Key topics: Directory structure, Go module info, Makefile targets, dependency counts.

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🏗️ architecture.md

What it contains: System design, Hub-and-Spoke pattern explanation, concurrency model, goroutine lifecycle, security model, and deployment architecture.
When to consult: When you need to understand HOW the system works at a high level, the threading model, or how components interact.
Key topics: CSP concurrency, fan-out broadcasting, TLS configuration, CI/CD pipeline structure.
Cross-references: → components.md for implementation details, → workflows.md for sequence flows.

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🧩 components.md

What it contains: Detailed description of each Go package — structs, methods, fields, and their responsibilities.
When to consult: When you need to modify a specific package, understand a struct's fields, or find where functionality lives.
Key topics: Hub struct and methods, Config struct, metrics variables, test coverage map.
Cross-references: → architecture.md for design rationale, → interfaces.md for external contracts.

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🔌 interfaces.md

What it contains: All external interfaces — WebSocket endpoint behavior, metrics endpoint, CLI flags, configuration schema, and integration points.
When to consult: When you need to understand how clients interact with the server, what the API contract is, or how to configure the service.
Key topics: WebSocket message protocol, Prometheus metric names, CLI usage, YAML config schema.
Cross-references: → data_models.md for config struct details, → components.md for handler implementation.

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📊 data_models.md

What it contains: All data structures — Config struct, Hub state, message format, metrics model, and connection state machine.
When to consult: When you need to understand data shapes, struct definitions, channel types, or state transitions.
Key topics: Config YAML mapping, Hub channels and their payloads, connection lifecycle states.
Cross-references: → interfaces.md for how models are exposed externally, → components.md for methods operating on these models.

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🔄 workflows.md

What it contains: Step-by-step process flows — startup, connection, broadcast, build/release, development, and error handling.
When to consult: When you need to understand the sequence of operations, debug a flow, or add a new feature that hooks into an existing workflow.
Key topics: Application startup sequence, client lifecycle, CI/CD pipeline steps, error handling paths.
Cross-references: → architecture.md for the concurrency model underlying workflows, → components.md for method details.

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📦 dependencies.md

What it contains: Complete dependency inventory — direct and transitive deps, their versions, usage locations, security considerations, and build tools.
When to consult: When updating dependencies, evaluating security, understanding what libraries provide, or considering alternatives.
Key topics: gorilla/websocket APIs used, Prometheus client usage, gopkg.in/yaml.v3 usage, transitive dependency tree.
Cross-references: → components.md for where dependencies are imported.

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📝 review_notes.md

What it contains: Documentation quality assessment — consistency issues, completeness gaps, bugs found during analysis, and prioritized recommendations.
When to consult: When looking for known issues, potential bugs, or areas needing improvement.
Key topics: Metrics type bug, port mismatch in example, missing features (graceful shutdown, rate limiting), test coverage gaps.
Cross-references: All other files (identifies issues across the entire codebase).

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Quick Lookup: Common Questions

Question	File to Consult
"What does this project do?"	This file (index.md)
"Where is X implemented?"	codebase_info.md → directory tree
"How does the Hub work?"	components.md → Hub section
"What's the WebSocket message format?"	interfaces.md → WebSocket Endpoint
"How do I build/test?"	codebase_info.md → Build Targets
"What metrics are exposed?"	interfaces.md → Metrics Endpoint
"What are the config options?"	interfaces.md → Configuration Interface
"Are there known bugs?"	review_notes.md → Inconsistencies
"What should I improve?"	review_notes.md → Recommendations
"What dependencies does it use?"	dependencies.md
"How does startup work?"	workflows.md → Application Startup
"How are connections handled?"	workflows.md → Client Connection Workflow
"What's the threading model?"	architecture.md → Concurrency Model