// MCP v2 with Server-Sent Events (SSE) Support
// Based on mcp-remote package patterns
const BASE_URL = 'https://api.llm.dflow.org';
// Tool definitions with proper MCP schema
const TOOLS = [
{
name: 'get_events',
description: 'Get a paginated list of all events with optional filtering and sorting.',
inputSchema: {
type: 'object',
properties: {
limit: {
type: 'integer',
minimum: 0,
maximum: 100,
description: 'Maximum number of events to return (0-100)'
},
cursor: {
type: 'integer',
minimum: 0,
description: 'Pagination cursor for fetching next page'
}
},
required: []
}
},
{
name: 'get_markets',
description: 'Get a paginated list of markets with optional filtering.',
inputSchema: {
type: 'object',
properties: {
limit: {
type: 'integer',
minimum: 0,
maximum: 100,
description: 'Number of markets to return (0-100)'
},
cursor: {
type: 'integer',
minimum: 0,
description: 'Pagination cursor for fetching next page'
}
},
required: []
}
},
{
name: 'get_trades',
description: 'Get a paginated list of trades across markets with optional filtering.',
inputSchema: {
type: 'object',
properties: {
limit: {
type: 'integer',
minimum: 0,
maximum: 100,
description: 'Number of trades to return (0-100)'
},
cursor: {
type: 'string',
description: 'Pagination cursor for fetching next page'
}
},
required: []
}
},
{
name: 'get_market_by_mint',
description: 'Get market details by token mint address.',
inputSchema: {
type: 'object',
properties: {
mint: {
type: 'string',
description: 'Token mint address to look up market'
}
},
required: ['mint']
}
},
{
name: 'get_live_data',
description: 'Get live data for events and markets.',
inputSchema: {
type: 'object',
properties: {
event_ticker: {
type: 'string',
description: 'Event ticker for live data'
},
market_ticker: {
type: 'string',
description: 'Market ticker for live data'
}
},
required: []
}
}
];
// Server info for MCP v2 protocol with SSE
const SERVER_INFO = {
protocolVersion: '2025-06-18',
capabilities: {
tools: {
listChanged: false
},
prompts: {},
resources: {},
sse: true // Add SSE capability
},
serverInfo: {
name: 'dflow-mcp-server',
version: '1.0.0',
description: 'Prediction Market Metadata API server for DFlow platform with SSE support'
}
};
// SSE Event formatter
function formatSSEEvent(type, data, id = null) {
let event = '';
if (id) event += `id: ${id}\n`;
if (type) event += `event: ${type}\n`;
event += `data: ${JSON.stringify(data)}\n\n`;
return event;
}
// SSE Response helper
function createSSEResponse(events, requestId = null) {
let response = '';
events.forEach(event => {
response += formatSSEEvent(event.type, event.data, requestId);
});
return {
statusCode: 200,
headers: {
'Access-Control-Allow-Origin': '*',
'Access-Control-Allow-Methods': 'GET, POST, OPTIONS',
'Access-Control-Allow-Headers': 'Content-Type, Authorization, x-api-key, Last-Event-ID',
'Content-Type': 'text/event-stream',
'Cache-Control': 'no-cache',
'Connection': 'keep-alive',
'X-Accel-Buffering': 'no' // Disable Nginx buffering for SSE
},
body: response
};
}
// API client function with streaming support
async function apiRequest(method, path, params) {
const url = new URL(path, BASE_URL);
if (params && method === 'GET') {
Object.entries(params).forEach(([key, value]) => {
url.searchParams.append(key, String(value));
});
}
const response = await fetch(url.toString(), {
method,
headers: {
'Content-Type': 'application/json',
},
body: method === 'POST' && params ? JSON.stringify(params) : undefined,
});
if (!response.ok) {
throw new Error(`HTTP ${response.status}: ${await response.text()}`);
}
return await response.json();
}
// Bootstrap response with SSE capabilities
async function handleBootstrap(request) {
console.log(`🚀 MCP V2 SSE: Bootstrap requested`);
const response = {
jsonrpc: "2.0",
id: request.id || "bootstrap-response",
result: {
name: SERVER_INFO.serverInfo.name,
version: SERVER_INFO.serverInfo.version,
description: SERVER_INFO.serverInfo.description,
protocolVersion: SERVER_INFO.protocolVersion,
capabilities: SERVER_INFO.capabilities,
serverInfo: SERVER_INFO.serverInfo,
tools: TOOLS.map(tool => ({
name: tool.name,
description: tool.description,
inputSchema: tool.inputSchema
})),
prompts: [],
resources: [],
connected: true,
server_url: "https://dflow.opensvm.com/mcp/v2",
status: "connected",
timestamp: new Date().toISOString(),
transport: "http_post_with_sse",
implementation: "netlify-functions-mcp-v2-sse",
sse: {
supported: true,
endpoint: "/mcp/v2/events",
keep_alive: true,
retry_time: 3000
},
endpoints: {
bootstrap: "/mcp/v2/bootstrap",
events: "/mcp/v2/events",
tools_list: "/mcp/v2/tools/list",
tools_call: "/mcp/v2/tools/call"
}
}
};
console.log(`✅ MCP V2 SSE BOOTSTRAP: ${JSON.stringify(response, null, 2)}`);
return response;
}
// SSE Events handler
async function handleSSEEvents(request) {
console.log(`📡 MCP V2 SSE: Events stream requested`);
const requestId = `sse-${Date.now()}`;
const events = [
{
type: 'connected',
data: {
status: 'connected',
server: SERVER_INFO.serverInfo.name,
timestamp: new Date().toISOString()
}
},
{
type: 'tools_available',
data: {
tools: TOOLS,
count: TOOLS.length
}
},
{
type: 'ready',
data: {
status: 'ready',
capabilities: SERVER_INFO.capabilities,
transport: 'sse'
}
}
];
return createSSEResponse(events, requestId);
}
// Tools list with SSE support
async function handleToolsList(request) {
console.log(`🛠️ MCP V2 SSE: tools/list`);
const response = {
jsonrpc: "2.0",
id: request.id,
result: {
tools: TOOLS,
transport: "sse_supported",
streaming: true
}
};
return response;
}
// Tools call with streaming response
async function handleToolsCall(request) {
const { name, arguments: args } = request.params;
const toolArgs = args || {};
console.log(`🔧 MCP V2 SSE: tools/call - ${name}`);
console.log(`📝 Args: ${JSON.stringify(toolArgs)}`);
try {
switch (name) {
case 'get_events':
result = await apiRequest('GET', '/api/v1/events', toolArgs);
break;
case 'get_markets':
result = await apiRequest('GET', '/api/v1/markets', toolArgs);
break;
case 'get_trades':
result = await apiRequest('GET', '/api/v1/trades', toolArgs);
break;
case 'get_market_by_mint':
result = await apiRequest('GET', `/api/v1/markets/by-mint/${toolArgs.mint}`);
break;
case 'get_live_data':
const path = toolArgs.event_ticker
? `/api/v1/events/live-data/${toolArgs.event_ticker}`
: toolArgs.market_ticker
? `/api/v1/markets/live-data/${toolArgs.market_ticker}`
: '/api/v1/live-data';
result = await apiRequest('GET', path);
break;
default:
throw new Error(`Unknown tool: ${name}`);
}
// Return streaming response
const requestId = `tool-${Date.now()}`;
const events = [
{
type: 'tool_started',
data: {
tool: name,
arguments: toolArgs
}
},
{
type: 'tool_result',
data: {
tool: name,
result: result,
content: [
{
type: 'text',
text: JSON.stringify(result, null, 2)
}
]
}
},
{
type: 'tool_completed',
data: {
tool: name,
success: true
}
}
];
return createSSEResponse(events, requestId);
} catch (error) {
const requestId = `tool-error-${Date.now()}`;
const events = [
{
type: 'tool_started',
data: {
tool: name,
arguments: toolArgs
}
},
{
type: 'tool_error',
data: {
tool: name,
error: error.message,
arguments: toolArgs
}
},
{
type: 'tool_completed',
data: {
tool: name,
success: false
}
}
];
return createSSEResponse(events, requestId);
}
}
// Main handler with SSE support
exports.handler = async function(event, context) {
const { httpMethod, body, headers, requestContext } = event;
const requestPath = requestContext.path || '';
console.log(`🌟 MCP V2 SSE: ${httpMethod} ${requestPath}`);
console.log(`📦 MCP V2 SSE BODY: ${body}`);
// Handle OPTIONS for CORS
if (httpMethod === 'OPTIONS') {
return {
statusCode: 200,
headers: {
'Access-Control-Allow-Origin': '*',
'Access-Control-Allow-Methods': 'GET, POST, OPTIONS',
'Access-Control-Allow-Headers': 'Content-Type, Authorization, x-api-key, Last-Event-ID',
'Access-Control-Max-Age': '86400',
}
};
}
// Handle SSE endpoint for GET requests (event stream)
if (httpMethod === 'GET' && requestPath === '/mcp/v2/events') {
return await handleSSEEvents();
}
// Handle only POST requests for MCP operations
if (httpMethod !== 'POST') {
return {
statusCode: 405,
headers: {
'Access-Control-Allow-Origin': '*',
'Content-Type': 'application/json'
},
body: JSON.stringify({
jsonrpc: "2.0",
id: null,
error: {
code: -32600,
message: 'Method not allowed'
}
})
};
}
try {
let request;
// Parse request
try {
request = JSON.parse(body);
console.log(`📋 MCP V2 SSE PARSED: ${JSON.stringify(request, null, 2)}`);
} catch (parseError) {
console.log(`💥 MCP V2 SSE PARSE ERROR: ${parseError.message}`);
return {
statusCode: 400,
headers: {
'Access-Control-Allow-Origin': '*',
'Content-Type': 'application/json'
},
body: JSON.stringify({
jsonrpc: "2.0",
id: null,
error: {
code: -32700,
message: 'Parse error',
data: parseError.message
}
})
};
}
// Standard CORS headers
const responseHeaders = {
'Access-Control-Allow-Origin': '*',
'Access-Control-Allow-Methods': 'GET, POST, OPTIONS',
'Access-Control-Allow-Headers': 'Content-Type, Authorization, x-api-key, Last-Event-ID',
'Content-Type': 'application/json'
};
// Route to appropriate handler
let response;
if (requestPath === '/mcp/v2/bootstrap') {
console.log(`🚀 MCP V2 SSE: Bootstrap handler called`);
response = await handleBootstrap(request);
} else if (request.method === 'tools/list') {
response = await handleToolsList(request);
} else if (request.method === 'tools/call') {
response = await handleToolsCall(request);
} else {
// Method not found
response = {
jsonrpc: "2.0",
id: request.id,
error: {
code: -32601,
message: 'Method not found',
data: {
available_methods: ['bootstrap', 'tools/list', 'tools/call'],
sse_endpoint: '/mcp/v2/events',
format: 'mcp_v2_sse'
}
}
};
}
console.log(`📤 MCP V2 SSE RESPONSE: ${JSON.stringify(response, null, 2)}`);
return {
statusCode: 200,
headers: responseHeaders,
body: JSON.stringify(response)
};
} catch (error) {
const errorResponse = {
jsonrpc: "2.0",
id: null,
error: {
code: -32603,
message: 'Internal error',
data: error.message
}
};
console.log(`💥 MCP V2 SSE INTERNAL ERROR: ${JSON.stringify(errorResponse, null, 2)}`);
return {
statusCode: 500,
headers: {
'Access-Control-Allow-Origin': '*',
'Content-Type': 'application/json'
},
body: JSON.stringify(errorResponse)
};
}
};
