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feat(MCP Server Trigger Node): Terminate sessions on DELETE request (#16550)

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Eugene
2025-06-23 08:59:40 +02:00
committed by GitHub
parent 351db434a8
commit 3969425925
4 changed files with 167 additions and 11 deletions
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38
packages/@n8n/nodes-langchain/nodes/mcp/McpTrigger/McpTrigger.node.ts
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@@ -125,6 +125,16 @@ export class McpTrigger extends Node {
ndvHideMethod: true,
ndvHideUrl: true,
},
{
name: 'default',
httpMethod: 'DELETE',
responseMode: 'onReceived',
isFullPath: true,
path: '={{$parameter["path"]}}',
nodeType: 'mcp',
ndvHideMethod: true,
ndvHideUrl: true,
},
],
};
@@ -162,22 +172,30 @@ export class McpTrigger extends Node {
return { noWebhookResponse: true };
} else if (webhookName === 'default') {
// Here we handle POST requests. These can be either
// Here we handle POST and DELETE requests.
// POST can be either:
// 1) Client calls in an established session using the SSE transport, or
// 2) Client calls in an established session using the StreamableHTTPServerTransport
// 3) Session setup requests using the StreamableHTTPServerTransport
// DELETE is used to terminate the session using the StreamableHTTPServerTransport
// Check if there is a session and a transport is already established
const sessionId = mcpServerManager.getSessionId(req);
if (sessionId && mcpServerManager.getTransport(sessionId)) {
const connectedTools = await getConnectedTools(context, true);
const wasToolCall = await mcpServerManager.handlePostMessage(req, resp, connectedTools);
if (wasToolCall) return { noWebhookResponse: true, workflowData: [[{ json: {} }]] };
if (req.method === 'DELETE') {
await mcpServerManager.handleDeleteRequest(req, resp);
} else {
// If no session is established, this is a setup request
// for the StreamableHTTPServerTransport, so we create a new transport
await mcpServerManager.createServerWithStreamableHTTPTransport(serverName, resp, req);
// Check if there is a session and a transport is already established
const sessionId = mcpServerManager.getSessionId(req);
if (sessionId && mcpServerManager.getTransport(sessionId)) {
const connectedTools = await getConnectedTools(context, true);
const wasToolCall = await mcpServerManager.handlePostMessage(req, resp, connectedTools);
if (wasToolCall) return { noWebhookResponse: true, workflowData: [[{ json: {} }]] };
} else {
// If no session is established, this is a setup request
// for the StreamableHTTPServerTransport, so we create a new transport
await mcpServerManager.createServerWithStreamableHTTPTransport(serverName, resp, req);
}
}
return { noWebhookResponse: true };
}