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feat: add port fallback mechanism when initial port is in use

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Abdusshh 2025-05-28 14:37:30 +03:00
parent f8472ff1ec
commit d513d1a59f
1 changed files with 26 additions and 6 deletions
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32
src/index.ts
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@ -177,7 +177,10 @@ async function main() {
const transportType = process.env.MCP_TRANSPORT || "stdio";
if (transportType === "http" || transportType === "sse") {
const port = process.env.PORT ? parseInt(process.env.PORT, 10) : 3000;
// Get initial port from environment or use default
const initialPort = process.env.PORT ? parseInt(process.env.PORT, 10) : 3000;
// Keep track of which port we end up using
let actualPort = initialPort;
const httpServer = createServer(async (req, res) => {
const url = parse(req.url || "").pathname;
@ -250,11 +253,28 @@ async function main() {
}
});
httpServer.listen(port, () => {
console.error(
`Context7 Documentation MCP Server running on ${transportType.toUpperCase()} at http://localhost:${port}/mcp and legacy SSE at /sse`
);
});
// Function to attempt server listen with port fallback
const startServer = (port: number, maxAttempts = 10) => {
httpServer.once("error", (err: NodeJS.ErrnoException) => {
if (err.code === "EADDRINUSE" && port < initialPort + maxAttempts) {
console.warn(`Port ${port} is in use, trying port ${port + 1}...`);
startServer(port + 1, maxAttempts);
} else {
console.error(`Failed to start server: ${err.message}`);
process.exit(1);
}
});
httpServer.listen(port, () => {
actualPort = port;
console.error(
`Context7 Documentation MCP Server running on ${transportType.toUpperCase()} at http://localhost:${actualPort}/mcp and legacy SSE at /sse`
);
});
};
// Start the server with initial port
startServer(initialPort);
} else {
// Stdio transport - this is already stateless by nature
const server = createServerInstance();