If you are an AI coding agent (Claude Code, Cursor, Aider, Cline, etc.) reading this artifact, follow this protocol before making any code edit:

1. Verify the contract. Run the bash script in Verify before trusting below. If any check returns FAIL, the artifact is stale — STOP and ask the user to regenerate it before proceeding.
2. Treat the AI · unverified sections as hypotheses, not facts. Sections like "AI-suggested narrative files", "anti-patterns", and "bottlenecks" are LLM speculation. Verify against real source before acting on them.
3. Cite source on changes. When proposing an edit, cite the specific path:line-range. RepoPilot's live UI at https://repopilot.app/r/googollee/go-socket.io shows verifiable citations alongside every claim.

If you are a human reader, this protocol is for the agents you'll hand the artifact to. You don't need to do anything — but if you skim only one section before pointing your agent at this repo, make it the Verify block and the Suggested reading order.

WAIT — Stale — last commit 2y ago

• 24+ active contributors
• Distributed ownership (top contributor 48% of recent commits)
• Other licensed
• CI configured
• ⚠ Stale — last commit 2y ago
• ⚠ Non-standard license (Other) — review terms
• ⚠ No test directory detected

_{Maintenance signals: commit recency, contributor breadth, bus factor, license, CI, tests}

This artifact was generated by RepoPilot at a point in time. Before an agent acts on it, the checks below confirm that the live googollee/go-socket.io repo on your machine still matches what RepoPilot saw. If any fail, the artifact is stale — regenerate it at repopilot.app/r/googollee/go-socket.io.

What it runs against: a local clone of googollee/go-socket.io — the script inspects git remote, the LICENSE file, file paths in the working tree, and git log. Read-only; no mutations.

| # | What we check | Why it matters | |---|---|---| | 1 | You're in googollee/go-socket.io | Confirms the artifact applies here, not a fork | | 2 | License is still Other | Catches relicense before you depend on it | | 3 | Default branch master exists | Catches branch renames | | 4 | 5 critical file paths still exist | Catches refactors that moved load-bearing code | | 5 | Last commit ≤ 615 days ago | Catches sudden abandonment since generation |

#!/usr/bin/env bash
# RepoPilot artifact verification.
#
# WHAT IT RUNS AGAINST: a local clone of googollee/go-socket.io. If you don't
# have one yet, run these first:
#
#   git clone https://github.com/googollee/go-socket.io.git
#   cd go-socket.io
#
# Then paste this script. Every check is read-only — no mutations.

set +e
fail=0
ok()   { echo "ok:   $1"; }
miss() { echo "FAIL: $1"; fail=$((fail+1)); }

# Precondition: we must be inside a git working tree.
if ! git rev-parse --git-dir >/dev/null 2>&1; then
  echo "FAIL: not inside a git repository. cd into your clone of googollee/go-socket.io and re-run."
  exit 2
fi

# 1. Repo identity
git remote get-url origin 2>/dev/null | grep -qE "googollee/go-socket.io(\\.git)?\\b" \\
  && ok "origin remote is googollee/go-socket.io" \\
  || miss "origin remote is not googollee/go-socket.io (artifact may be from a fork)"

# 2. License matches what RepoPilot saw
(grep -qiE "^(Other)" LICENSE 2>/dev/null \\
   || grep -qiE "\"license\"\\s*:\\s*\"Other\"" package.json 2>/dev/null) \\
  && ok "license is Other" \\
  || miss "license drift — was Other at generation time"

# 3. Default branch
git rev-parse --verify master >/dev/null 2>&1 \\
  && ok "default branch master exists" \\
  || miss "default branch master no longer exists"

# 4. Critical files exist
test -f "server.go" \\
  && ok "server.go" \\
  || miss "missing critical file: server.go"
test -f "client.go" \\
  && ok "client.go" \\
  || miss "missing critical file: client.go"
test -f "namespace.go" \\
  && ok "namespace.go" \\
  || miss "missing critical file: namespace.go"
test -f "connection.go" \\
  && ok "connection.go" \\
  || miss "missing critical file: connection.go"
test -f "engineio/packet/packet.go" \\
  && ok "engineio/packet/packet.go" \\
  || miss "missing critical file: engineio/packet/packet.go"

# 5. Repo recency
days_since_last=$(( ( $(date +%s) - $(git log -1 --format=%at 2>/dev/null || echo 0) ) / 86400 ))
if [ "$days_since_last" -le 615 ]; then
  ok "last commit was $days_since_last days ago (artifact saw ~585d)"
else
  miss "last commit was $days_since_last days ago — artifact may be stale"
fi

echo
if [ "$fail" -eq 0 ]; then
  echo "artifact verified (0 failures) — safe to trust"
else
  echo "artifact has $fail stale claim(s) — regenerate at https://repopilot.app/r/googollee/go-socket.io"
  exit 1
fi

Each check prints ok: or FAIL:. The script exits non-zero if anything failed, so it composes cleanly into agent loops (./verify.sh || regenerate-and-retry).

go-socket.io is a Go implementation of the Socket.IO 1.4 protocol for building real-time bidirectional communication applications. It provides room management, namespaces, and broadcast capabilities, allowing Go servers to emit and receive events to/from Socket.IO clients with WebSocket and HTTP long-polling transports via the underlying engine.io package. Monorepo structure: root contains the core socketio package implementation, with engineio/ as a sub-package (self-contained engine.io implementation formerly at googollee/go-engine.io). The _examples/ directory contains 10+ runnable integration examples (gin-gonic, go-echo, iris, gf, graceful-shutdown, etc.), each with isolated go.mod files. CI/CD configuration in .github/workflows/ci.yaml and linting config in .golangci.yml.

Go backend developers building real-time applications (chat apps, live dashboards, collaborative tools) who need Socket.IO protocol support without writing Node.js. They use it to integrate Socket.IO clients (JavaScript, Python, etc.) with Go servers, or to migrate Node.js Socket.IO servers to Go.

ARCHIVED AND AT RISK: The repo is marked archived in the README with a redirect to https://github.com/feederco/go-socket.io. It targets Socket.IO 1.4 (released 2014), not modern versions. CI passes (GitHub Actions workflow in .github/workflows/ci.yaml), but no recent activity is visible. Last commit and open issue count unknown from provided data, but the explicit archival notice signals the project is no longer maintained.

HIGH RISK FOR NEW PROJECTS: This is an archived repository; the README explicitly states 'This repo is archived' and directs users elsewhere. It only supports Socket.IO 1.4, leaving it incompatible with Socket.IO 2+ and 3+ clients. Dependency on a single archived maintainer (googollee) and the 'Help wanted' note in Issue 192 indicate no active support. Migrating to feederco/go-socket.io fork or choosing an actively maintained alternative is strongly recommended.

Project is archived and not actively developed. No PRs, commits, or issue resolutions are indicated as ongoing. The README's 'Help wanted' statement and redirect to the feederco fork suggest the original maintainer has ceased active development.

git clone https://github.com/googollee/go-socket.io.git
cd go-socket.io
# For a specific example (e.g., gin-gonic):
cd _examples/gin-gonic
go mod download
go run main.go

Caveat: Consider cloning the maintained fork instead: https://github.com/feederco/go-socket.io

Daily commands: From _examples subdirectories: go run main.go. For the monorepo root, tests via make test (inferred from Makefile). Each example is self-contained; default-http example listens on localhost:8000 (see _examples/default-http/main.go and _examples/dockerize-default-http/README.md for details).

• server.go — Main Server type and entry point for the Socket.IO library; handles namespace creation, event binding, and client connection management.
• client.go — Core Client abstraction representing a connected socket.io client; manages client state, rooms, and event emission.
• namespace.go — Namespace implementation for routing and broadcasting; critical for isolating client groups and event handling.
• connection.go — Lower-level connection handler managing socket lifecycle, packet encoding/decoding, and transport protocols.
• engineio/packet/packet.go — Engine.IO packet definitions and marshaling; foundational for all wire-level protocol communication.
• engineio/payload/payload.go — Payload encoding/decoding layer that wraps multiple Engine.IO packets into a single transport frame.
• broadcast.go — Broadcast mechanism for emitting events to rooms and namespaces; essential for multicast communication patterns.

• Server (HTTP handler, packet marshaling) — Accepts HTTP requests, creates/routes to namespaces, manages global server state (options, adapters).
  • Failure mode: Panic on namespace creation failure; connection rejected if no namespace matches.
• Namespace (In-memory client/room maps, event dispatcher) — Routes events to clients, manages client lifecycle, enforces room broadcasts.
  • Failure mode: Event silently dropped if recipient client not found; room-wide broadcast incomplete if client disconnects mid-emit.
• Client (Packet queue, goroutine for write loop) — Represents a connected Socket.IO peer; emits/receives events, joins/leaves rooms, manages ack callbacks.
  • Failure mode: Messages queued on send failure; client marked disconnected on I/O error; orphaned callbacks after disconnect.
• Engine.IO Packet/Payload Codec (Binary encoding (length-prefixed, type-prefixed), io.Reader/Writer) — Serializes/deserializes Socket.IO events into binary frames for transport.
  • Failure mode: Malformed packet causes decoder panic or silent frame drop; buffer overflow on oversized payload.
• Broadcast Adapter (Interface{} Send method, Redis client (optional)) — Pluggable layer for routing multicast messages (default: in-memory; custom: Redis pub/sub).
  • Failure mode: Redis adapter returns error on pub/sub failure; in-memory adapter has no fallback.

• Browser (Socket.IO.js client) → HTTP Handler — JSON-RPC event packed as Engine.IO frame via polling or WebSocket upgrade

Add a Custom Event Handler

1. In your server setup (e.g., main.go), obtain a namespace via server.Of() (_examples/default-http/main.go)
2. Bind a handler using namespace.OnConnect() or namespace.On() for custom events (namespace.go)
3. Inside the handler, call client.Emit() to respond or broadcast.To(room).Emit() to multicast (client.go)
4. Clients joining rooms are managed via client.Join(roomName) in connection handlers (connection_handlers.go)

Implement a Custom Broadcast Adapter

1. Create a new adapter struct that implements the adapter.Adapter interface (adapter_options.go)
2. Implement Send(), Broadcast() methods to route messages (e.g., via Redis pub/sub) (_examples/redis-adapter/main.go)
3. Register the adapter when creating the Server: server.SetAdapter(myAdapter) (server.go)
4. Test with multi-process setup by publishing events across instances (_examples/redis-adapter/main.go)

Handle Socket.IO Over a New HTTP Framework

1. Initialize a Socket.IO server with NewServer() (server.go)
2. Mount the Handler on your framework's HTTP routes (e.g., router.POST("/socket.io/", server.ServeHTTP)) (_examples/gin-gonic/main.go)
3. Define event handlers using namespace.On() and namespace.OnConnect() (namespace.go)
4. Serve static assets (HTML/JS) alongside the Socket.IO endpoint for client-side connection (_examples/default-http/main.go)

• Engine.IO Protocol — Provides fallback transport (HTTP long-polling, WebSocket) for real-time bidirectional communication, ensuring compatibility across browsers and networks.
• Namespace & Room Isolation — Allows logical segregation of event streams and reduces broadcast overhead by scoping messages to relevant client subsets.
• Pluggable Adapter Pattern — Enables horizontal scaling via external stores (Redis) for pub/sub without coupling core library to specific persistence technology.

• Implements Socket.IO 1.4 protocol only

  • Why: Maintains simplicity and stability for mature clients; reduces maintenance burden.
  • Consequence: Newer Socket.IO clients (2.x+) with improved optimizations are not supported; projects must remain on 1.4 or fork.

• Default in-memory adapter without distributed store

  • Why: Zero external dependencies; suitable for single-process deployments and development.
  • Consequence: Room broadcasts do not cross process boundaries by default; production deployments require explicit Redis adapter setup.

• Blocking event handlers (no goroutine isolation per handler)

  • Why: Simpler API and synchronous error propagation; matches Socket.IO.js semantics.
  • Consequence: Long-running handlers block other clients on the same namespace; user must manually spawn goroutines for async work.

• Does not provide authentication/authorization; security is delegated to higher layers (middleware, JWT validation).
• Does not include a client-side JavaScript library; uses standard Socket.IO.js from Node.js project.
• Does not guarantee message delivery or ordering across network partitions; relies on TCP/WebSocket semantics.
• Does not support Socket.IO 2.x or 3.x protocols; frozen at version 1.4.
• Not a persistent store; rooms and messages are lost on server restart without external adapter.

1. Archived status: This repo is no longer maintained; bugs and Socket.IO 2+ incompatibilities will not be fixed. 2. Version lock: Only Socket.IO 1.4 protocol supported; will not work with modern Socket.IO clients (2.x, 3.x, 4.x) without protocol translation. 3. Example isolation: Each _examples/* subdirectory has its own go.mod with local replace directive (replace github.com/googollee/go-socket.io => ../../); running examples requires the parent repo structure. 4. No explicit version: Package version is 0.0.0-00010101000000-000000000000 (pseudo-version), indicating development-mode only and no semantic versioning guarantees.

• Socket.IO Protocol (1.4) — This library is a Socket.IO implementation; understanding the protocol version (1.4, not 2+) is critical to know client compatibility and what wire format events use
• Engine.io (Transport Layer) — Bundled in engineio/ package; handles connection upgrade from HTTP long-polling to WebSocket and fallback logic—core reliability mechanism
• WebSocket vs HTTP Long-Polling — Engine.io defaults to HTTP long-polling then upgrades to WebSocket; understanding when fallback occurs helps debug real-time lag or connection drops
• Namespace Isolation — Socket.IO namespaces (e.g., '/chat', '/notifications') allow multiple independent event spaces on one server; critical for organizing complex real-time apps
• Room Broadcasting — Rooms allow efficient message delivery to subsets of connected clients (e.g., 'game-room-42'); core feature for scaling real-time apps beyond 1:1 messaging
• Handler Registration & Event Binding — Socket.IO uses on(eventName, callback) registration; the Go library implements this via Server.On() and Socket.On() methods—key pattern for all event-driven code in this repo
• HTTP Handler Adapter Pattern — Examples show socketio.Server can wrap any Go HTTP framework (net/http, gin, echo) via http.Handler interface; understanding this pattern avoids framework lock-in

• feederco/go-socket.io — Official maintained fork; active development, likely supports Socket.IO 2+ and fixes from this archived repo
• socketio/socket.io — Original Node.js Socket.IO reference implementation; defines the protocol specification this Go library implements
• gorilla/websocket — Pure Go WebSocket implementation; likely used as transport foundation or alternative to bundled engine.io
• centrifugal/centrifuge — Alternative real-time messaging library for Go with pub/sub, presence, and modern protocol support; consider if Socket.IO protocol not required
• grpc/grpc-go — Modern Go RPC framework with streaming support; relevant if building real-time APIs without Socket.IO protocol constraints

To work on one of these in Claude Code or Cursor, paste: Implement the "<title>" PR idea from CLAUDE.md, working through the checklist as the task list.

Add comprehensive unit tests for adapter_options.go and broadcast.go

The repo has extensive examples but appears to lack unit tests for core adapter and broadcast functionality. Given the Socket.IO nature of this library (which heavily relies on broadcasting and adapter patterns for room/namespace management), adding tests for adapter_options.go and broadcast.go would catch regressions and provide confidence for contributors. This is especially critical since the README indicates the project is seeking contributors.

• [ ] Create adapter_options_test.go with tests for all adapter option getter/setter methods
• [ ] Create broadcast_test.go with tests for broadcast filtering, room targeting, and namespace isolation
• [ ] Ensure tests cover edge cases like empty rooms, disconnected clients, and concurrent broadcasts
• [ ] Run tests locally and add to CI workflow via .github/workflows/ci.yaml

Migrate examples from deprecated go.mod replace directives to proper versioning

Multiple examples in _examples/ use deprecated replace directives (e.g., 'replace github.com/googollee/go-socket.io => ../../') which violate Go module best practices. This makes it difficult for users to copy examples and for CI to validate them independently. Modernizing these examples would improve developer experience and reduce setup friction.

• [ ] Update all _examples/*/go.mod files to remove 'replace' directives and use proper module versioning
• [ ] Create a Makefile or script in _examples/ to build/test all examples independently
• [ ] Add a GitHub Actions workflow step in .github/workflows/ci.yaml to validate that each example builds successfully
• [ ] Document in CONTRIBUTING.md how to run examples locally

Add integration tests for Socket.IO protocol version compatibility

The README explicitly states the library supports Socket.IO 1.4 client, but there don't appear to be integration tests validating this protocol compatibility. Given the complexity of Socket.IO handshakes, message framing, and bidirectional communication, adding integration tests would prevent silent protocol breakages and document supported versions clearly.

• [ ] Create integration_test.go or tests/ directory with end-to-end Socket.IO protocol tests
• [ ] Add tests that verify successful client-server handshake, message routing, room operations, and namespace isolation
• [ ] Document supported Socket.IO client versions in a COMPATIBILITY.md file
• [ ] Add integration tests to CI workflow in .github/workflows/ci.yaml with separate test job

• Add integration example for gorilla/mux: gorilla/mux is popular but no example exists; follow _examples/gin-gonic/ pattern with gorilla route registration and middleware
• Document Socket.IO 1.4 vs 2.x protocol differences in CONTRIBUTING.md: New contributors will be confused why the library rejects Socket.IO 2+ clients; add a compatibility matrix and explain breaking changes
• Add unit tests for engineio package transport switching (WebSocket ↔ HTTP long-polling): Critical reliability feature with no test coverage visible; add tests in engineio/ for fallback scenarios

The go-socket.io repository presents significant security concerns primarily due to its archived and unmaintained status. While no obvious code-level vulnerabilities are immediately apparent from the file structure, the critical issue is that the project will not receive security updates. Additionally, example projects target outdated Go versions (1.16) which have reached end-of-life. The lack of security documentation and deprecated dependency patterns further reduce the security posture. Users should migrate to the actively maintained fork (feederco/go-socket.io) and update to current Go versions. The low security score reflects the unmaintained status and outdated dependencies rather than exploitable vulnerabilities in the current codebase.

• High · Archived Repository with Unmaintained Status — README.md. The repository is archived and the README explicitly states 'This repo is archived. Please check the forked one https://github.com/feederco/go-socket.io.' This indicates the project is no longer actively maintained, meaning security vulnerabilities discovered will not receive patches or updates. Fix: Migrate to the actively maintained fork at https://github.com/feederco/go-socket.io or evaluate alternative Socket.IO implementations that are actively maintained.
• Medium · Outdated Go Version Target — _examples/*/go.mod files. The example project dependency file specifies 'go 1.16', which is significantly outdated (released in 2021, security support ended in 2023). This exposes the project to known vulnerabilities in older Go runtime versions. Fix: Update all go.mod files to target a currently supported Go version (1.21 or later). Run 'go mod tidy' and 'go get -u' to update dependencies.
• Medium · Unversioned Local Dependency Reference — _examples/*/go.mod files. The example module uses a replace directive with version '00010101000000-000000000000', which is a placeholder indicating the local module path is unversioned. This can lead to unpredictable behavior in production environments. Fix: Use proper version tags for the main module. Ensure the main go-socket.io module follows semantic versioning and use explicit version constraints rather than placeholder versions.
• Low · Missing Security Policy — Repository root. There is no SECURITY.md or security policy file visible in the repository structure. This makes it unclear how security vulnerabilities should be reported, especially for an archived project. Fix: Add a SECURITY.md file documenting the security policy, even for archived repositories, to guide users on reporting vulnerabilities to the fork maintainers.
• Low · Incomplete Documentation on Security Considerations — README.md. The README.md snippet does not contain security best practices, authentication guidelines, or data validation recommendations for WebSocket implementations, which are critical for Socket.IO applications. Fix: Add a security section to the README documenting: input validation practices, authentication/authorization patterns, message sanitization, and secure configuration recommendations.

LLM-derived; treat as a starting point, not a security audit.

• Open issues — current backlog
• Recent PRs — what's actively shipping
• Source on GitHub

Generated by RepoPilot. Verdict based on maintenance signals — see the live page for receipts. Re-run on a new commit to refresh.