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Specialized skill for WebSocket protocol implementation and testing. Generate RFC 6455 compliant implementations, validate handshake and framing, test with Autobahn Test Suite, implement compression, and debug connection issues.
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Reference for querying the Atlas knowledge graph through its MCP tools — the SECONDARY enrichment/comparison layer that adds best-practice context to systems you have ALREADY scanned from your real sources (`az`, repos, dirs). Use when you need to look up nodes, edges, kinds, clusters, stats, or wiki pages in Atlas to compare against your real inventory. (atlas graph, query atlas, atlas mcp, search the graph, graph neighbors, atlas record, atlas kinds, enrichment layer)
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This skill should be used when the user asks to "find skills in the wild", "assimilate popular workflows", "discover SKILL.md files in repos", "research external skills", "find workflow patterns", "survey the skill landscape", "what skills exist out there", or wants to investigate public repositories for extractable processes, babysitter plugins, and reusable procedural insights. Searches GitHub for SKILL.md files, classifies repos by archetype, and maintains structured research under docs/reference-repos/.
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SOC 직업 분류 기준
| name | websocket |
| description | Specialized skill for WebSocket protocol implementation and testing. Generate RFC 6455 compliant implementations, validate handshake and framing, test with Autobahn Test Suite, implement compression, and debug connection issues. |
| allowed-tools | Bash(*) Read Write Edit Glob Grep WebFetch |
| metadata | {"author":"babysitter-sdk","version":"1.0.0","category":"real-time-communication","backlog-id":"SK-005"} |
| graph | {"domains":["domain:networking"],"specializations":["specialization:network-programming"],"skillAreas":["skill-area:protocol-design","skill-area:socket-programming","skill-area:websocket-design"],"roles":["role:backend-engineer","role:sre"],"topics":["topic:circuit-breakers"]} |
You are websocket - a specialized skill for WebSocket protocol implementation and testing, providing deep expertise in RFC 6455 compliance, real-time messaging, and performance optimization.
This skill enables AI-powered WebSocket operations including:
wscat or websocat for CLI testingImplement RFC 6455 compliant handshake:
const crypto = require('crypto');
const http = require('http');
const WS_MAGIC_STRING = '258EAFA5-E914-47DA-95CA-C5AB0DC85B11';
function computeAcceptKey(secWebSocketKey) {
return crypto
.createHash('sha1')
.update(secWebSocketKey + WS_MAGIC_STRING)
.digest('base64');
}
function handleUpgrade(req, socket) {
// Validate upgrade request
if (req.headers['upgrade']?.toLowerCase() !== 'websocket') {
socket.end('HTTP/1.1 400 Bad Request\r\n\r\n');
return false;
}
const key = req.headers['sec-websocket-key'];
if (!key) {
socket.end('HTTP/1.1 400 Bad Request\r\n\r\n');
return false;
}
// Validate key format (16 bytes base64 encoded)
const keyBytes = Buffer.from(key, 'base64');
if (keyBytes.length !== 16) {
socket.end('HTTP/1.1 400 Bad Request\r\n\r\n');
return false;
}
const acceptKey = computeAcceptKey(key);
// Optional: Handle subprotocol negotiation
const requestedProtocols = req.headers['sec-websocket-protocol']?.split(',').map(p => p.trim()) || [];
const selectedProtocol = negotiateProtocol(requestedProtocols);
// Build response headers
let response = [
'HTTP/1.1 101 Switching Protocols',
'Upgrade: websocket',
'Connection: Upgrade',
`Sec-WebSocket-Accept: ${acceptKey}`
];
if (selectedProtocol) {
response.push(`Sec-WebSocket-Protocol: ${selectedProtocol}`);
}
// Optional: Handle extensions
const extensions = negotiateExtensions(req.headers['sec-websocket-extensions']);
if (extensions) {
response.push(`Sec-WebSocket-Extensions: ${extensions}`);
}
socket.write(response.join('\r\n') + '\r\n\r\n');
return true;
}
function negotiateProtocol(requested) {
const supported = ['graphql-ws', 'wamp.2.json', 'mqtt'];
return requested.find(p => supported.includes(p)) || null;
}
function negotiateExtensions(extensionHeader) {
// Example: permessage-deflate negotiation
if (extensionHeader?.includes('permessage-deflate')) {
return 'permessage-deflate; server_no_context_takeover; client_no_context_takeover';
}
return null;
}
Parse and create WebSocket frames:
const OPCODES = {
CONTINUATION: 0x0,
TEXT: 0x1,
BINARY: 0x2,
CLOSE: 0x8,
PING: 0x9,
PONG: 0xA
};
class WebSocketFrame {
constructor() {
this.fin = true;
this.rsv1 = false;
this.rsv2 = false;
this.rsv3 = false;
this.opcode = OPCODES.TEXT;
this.masked = false;
this.maskingKey = null;
this.payload = Buffer.alloc(0);
}
static parse(buffer) {
if (buffer.length < 2) return { frame: null, consumed: 0 };
const frame = new WebSocketFrame();
let offset = 0;
// First byte: FIN, RSV1-3, Opcode
const byte0 = buffer[offset++];
frame.fin = (byte0 & 0x80) !== 0;
frame.rsv1 = (byte0 & 0x40) !== 0;
frame.rsv2 = (byte0 & 0x20) !== 0;
frame.rsv3 = (byte0 & 0x10) !== 0;
frame.opcode = byte0 & 0x0F;
// Second byte: MASK, Payload length
const byte1 = buffer[offset++];
frame.masked = (byte1 & 0x80) !== 0;
let payloadLength = byte1 & 0x7F;
// Extended payload length
if (payloadLength === 126) {
if (buffer.length < offset + 2) return { frame: null, consumed: 0 };
payloadLength = buffer.readUInt16BE(offset);
offset += 2;
} else if (payloadLength === 127) {
if (buffer.length < offset + 8) return { frame: null, consumed: 0 };
// JavaScript can't handle 64-bit integers precisely
const high = buffer.readUInt32BE(offset);
const low = buffer.readUInt32BE(offset + 4);
payloadLength = high * 0x100000000 + low;
offset += 8;
}
// Masking key (if masked)
if (frame.masked) {
if (buffer.length < offset + 4) return { frame: null, consumed: 0 };
frame.maskingKey = buffer.slice(offset, offset + 4);
offset += 4;
}
// Payload
if (buffer.length < offset + payloadLength) {
return { frame: null, consumed: 0 };
}
frame.payload = buffer.slice(offset, offset + payloadLength);
offset += payloadLength;
// Unmask payload if needed
if (frame.masked) {
frame.payload = Buffer.from(frame.payload); // Create copy
for (let i = 0; i < frame.payload.length; i++) {
frame.payload[i] ^= frame.maskingKey[i % 4];
}
}
return { frame, consumed: offset };
}
serialize(mask = false) {
const payloadLength = this.payload.length;
let headerLength = 2;
if (payloadLength > 65535) headerLength += 8;
else if (payloadLength > 125) headerLength += 2;
if (mask) headerLength += 4;
const buffer = Buffer.alloc(headerLength + payloadLength);
let offset = 0;
// First byte
buffer[offset++] = (this.fin ? 0x80 : 0) |
(this.rsv1 ? 0x40 : 0) |
(this.rsv2 ? 0x20 : 0) |
(this.rsv3 ? 0x10 : 0) |
this.opcode;
// Second byte and extended length
let lengthByte = mask ? 0x80 : 0;
if (payloadLength > 65535) {
lengthByte |= 127;
buffer[offset++] = lengthByte;
buffer.writeUInt32BE(Math.floor(payloadLength / 0x100000000), offset);
buffer.writeUInt32BE(payloadLength % 0x100000000, offset + 4);
offset += 8;
} else if (payloadLength > 125) {
lengthByte |= 126;
buffer[offset++] = lengthByte;
buffer.writeUInt16BE(payloadLength, offset);
offset += 2;
} else {
lengthByte |= payloadLength;
buffer[offset++] = lengthByte;
}
// Masking key
if (mask) {
const maskingKey = crypto.randomBytes(4);
maskingKey.copy(buffer, offset);
offset += 4;
// Copy and mask payload
for (let i = 0; i < payloadLength; i++) {
buffer[offset + i] = this.payload[i] ^ maskingKey[i % 4];
}
} else {
this.payload.copy(buffer, offset);
}
return buffer;
}
}
Complete WebSocket server:
const http = require('http');
const crypto = require('crypto');
const EventEmitter = require('events');
class WebSocketServer extends EventEmitter {
constructor(options = {}) {
super();
this.port = options.port || 8080;
this.maxPayload = options.maxPayload || 100 * 1024 * 1024; // 100MB
this.clients = new Set();
this.server = http.createServer((req, res) => {
res.writeHead(426, { 'Content-Type': 'text/plain' });
res.end('WebSocket server - upgrade required');
});
this.server.on('upgrade', (req, socket, head) => {
this.handleUpgrade(req, socket, head);
});
}
handleUpgrade(req, socket, head) {
const key = req.headers['sec-websocket-key'];
if (!key) {
socket.end('HTTP/1.1 400 Bad Request\r\n\r\n');
return;
}
const acceptKey = crypto
.createHash('sha1')
.update(key + '258EAFA5-E914-47DA-95CA-C5AB0DC85B11')
.digest('base64');
socket.write([
'HTTP/1.1 101 Switching Protocols',
'Upgrade: websocket',
'Connection: Upgrade',
`Sec-WebSocket-Accept: ${acceptKey}`,
'',
''
].join('\r\n'));
const client = new WebSocketConnection(socket, this);
this.clients.add(client);
client.on('close', () => {
this.clients.delete(client);
});
this.emit('connection', client, req);
}
broadcast(message, excludeClient = null) {
for (const client of this.clients) {
if (client !== excludeClient && client.readyState === 'OPEN') {
client.send(message);
}
}
}
listen(callback) {
this.server.listen(this.port, callback);
}
close(callback) {
for (const client of this.clients) {
client.close(1001, 'Server shutting down');
}
this.server.close(callback);
}
}
class WebSocketConnection extends EventEmitter {
constructor(socket, server) {
super();
this.socket = socket;
this.server = server;
this.readyState = 'OPEN';
this.buffer = Buffer.alloc(0);
this.fragments = [];
socket.on('data', (data) => this.handleData(data));
socket.on('close', () => this.handleClose());
socket.on('error', (err) => this.emit('error', err));
}
handleData(data) {
this.buffer = Buffer.concat([this.buffer, data]);
while (this.buffer.length > 0) {
const { frame, consumed } = WebSocketFrame.parse(this.buffer);
if (!frame) break;
this.buffer = this.buffer.slice(consumed);
this.handleFrame(frame);
}
}
handleFrame(frame) {
switch (frame.opcode) {
case OPCODES.TEXT:
case OPCODES.BINARY:
if (frame.fin) {
const data = frame.opcode === OPCODES.TEXT
? frame.payload.toString('utf8')
: frame.payload;
this.emit('message', data);
} else {
this.fragments.push(frame);
}
break;
case OPCODES.CONTINUATION:
this.fragments.push(frame);
if (frame.fin) {
const firstFrame = this.fragments[0];
const payload = Buffer.concat(this.fragments.map(f => f.payload));
const data = firstFrame.opcode === OPCODES.TEXT
? payload.toString('utf8')
: payload;
this.emit('message', data);
this.fragments = [];
}
break;
case OPCODES.PING:
this.pong(frame.payload);
break;
case OPCODES.PONG:
this.emit('pong', frame.payload);
break;
case OPCODES.CLOSE:
let code = 1005;
let reason = '';
if (frame.payload.length >= 2) {
code = frame.payload.readUInt16BE(0);
reason = frame.payload.slice(2).toString('utf8');
}
this.close(code, reason);
break;
}
}
send(data) {
if (this.readyState !== 'OPEN') return;
const frame = new WebSocketFrame();
if (typeof data === 'string') {
frame.opcode = OPCODES.TEXT;
frame.payload = Buffer.from(data, 'utf8');
} else {
frame.opcode = OPCODES.BINARY;
frame.payload = data;
}
this.socket.write(frame.serialize(false)); // Server doesn't mask
}
ping(data = Buffer.alloc(0)) {
const frame = new WebSocketFrame();
frame.opcode = OPCODES.PING;
frame.payload = Buffer.isBuffer(data) ? data : Buffer.from(data);
this.socket.write(frame.serialize(false));
}
pong(data = Buffer.alloc(0)) {
const frame = new WebSocketFrame();
frame.opcode = OPCODES.PONG;
frame.payload = Buffer.isBuffer(data) ? data : Buffer.from(data);
this.socket.write(frame.serialize(false));
}
close(code = 1000, reason = '') {
if (this.readyState === 'CLOSED') return;
this.readyState = 'CLOSING';
const frame = new WebSocketFrame();
frame.opcode = OPCODES.CLOSE;
const codeBuffer = Buffer.alloc(2);
codeBuffer.writeUInt16BE(code, 0);
const reasonBuffer = Buffer.from(reason, 'utf8');
frame.payload = Buffer.concat([codeBuffer, reasonBuffer]);
this.socket.write(frame.serialize(false));
this.socket.end();
}
handleClose() {
this.readyState = 'CLOSED';
this.emit('close');
}
}
Implement WebSocket compression:
const zlib = require('zlib');
class PerMessageDeflate {
constructor(options = {}) {
this.serverNoContextTakeover = options.serverNoContextTakeover || false;
this.clientNoContextTakeover = options.clientNoContextTakeover || false;
this.serverMaxWindowBits = options.serverMaxWindowBits || 15;
this.clientMaxWindowBits = options.clientMaxWindowBits || 15;
this.inflateContext = null;
this.deflateContext = null;
}
compress(data, callback) {
if (!this.deflateContext || this.serverNoContextTakeover) {
this.deflateContext = zlib.createDeflateRaw({
windowBits: this.serverMaxWindowBits
});
}
const chunks = [];
this.deflateContext.on('data', (chunk) => chunks.push(chunk));
this.deflateContext.on('end', () => {
let result = Buffer.concat(chunks);
// Remove trailing 0x00 0x00 0xFF 0xFF
if (result.length >= 4 &&
result[result.length - 4] === 0x00 &&
result[result.length - 3] === 0x00 &&
result[result.length - 2] === 0xFF &&
result[result.length - 1] === 0xFF) {
result = result.slice(0, -4);
}
callback(null, result);
});
this.deflateContext.write(data);
this.deflateContext.flush(zlib.Z_SYNC_FLUSH);
}
decompress(data, callback) {
if (!this.inflateContext || this.clientNoContextTakeover) {
this.inflateContext = zlib.createInflateRaw({
windowBits: this.clientMaxWindowBits
});
}
// Add trailing bytes for decompression
const trailer = Buffer.from([0x00, 0x00, 0xFF, 0xFF]);
const input = Buffer.concat([data, trailer]);
const chunks = [];
this.inflateContext.on('data', (chunk) => chunks.push(chunk));
this.inflateContext.on('end', () => {
callback(null, Buffer.concat(chunks));
});
this.inflateContext.on('error', (err) => callback(err));
this.inflateContext.write(input);
this.inflateContext.flush();
}
}
Test WebSocket implementations:
# Using wscat
wscat -c ws://localhost:8080
# Using websocat
websocat ws://localhost:8080
# Autobahn Test Suite (fuzzing)
docker run -it --rm \
-v "${PWD}/reports:/reports" \
-p 9001:9001 \
crossbario/autobahn-testsuite \
wstest --mode fuzzingclient --spec /config/fuzzingclient.json
This skill can leverage the following MCP servers for enhanced capabilities:
| Server | Description | Integration |
|---|---|---|
| MCP-WebSocket Architecture | WebSocket transport with MCP | Real-time AI integration |
| claude-agent-server | WebSocket server for Claude Agent SDK | Agent orchestration |
| Claude-Flow | Multi-agent communication via WebSocket | Distributed agents |
This skill integrates with the following processes:
websocket-server.js - WebSocket server implementationwebsocket-client.js - WebSocket client implementationrealtime-messaging-system.js - Real-time messaging architectureWhen executing operations, provide structured output:
{
"operation": "test",
"target": "ws://localhost:8080",
"status": "success",
"handshake": {
"protocol": "graphql-ws",
"extensions": ["permessage-deflate"]
},
"metrics": {
"messagesReceived": 1000,
"messagesSent": 1000,
"avgLatencyMs": 2.5,
"compressionRatio": 0.65
},
"compliance": {
"rfc6455": true,
"autobahnPassed": 512,
"autobahnFailed": 0
}
}