first commit

packages/@n8n/nodes-langchain/nodes/mcp/McpTrigger/execution/QueuedExecutionStrategy.ts

@@ -0,0 +1,35 @@
+import type { Tool } from '@langchain/core/tools';
+
+import type { ExecutionContext, ExecutionStrategy } from './ExecutionStrategy';
+import type { PendingCallsManager } from './PendingCallsManager';
+
+const DEFAULT_TIMEOUT_MS = 120000;
+
+export class QueuedExecutionStrategy implements ExecutionStrategy {
+	constructor(
+		private pendingCalls: PendingCallsManager,
+		private timeoutMs: number = DEFAULT_TIMEOUT_MS,
+	) {}
+
+	async executeTool(
+		tool: Tool,
+		args: Record<string, unknown>,
+		context: ExecutionContext,
+	): Promise<unknown> {
+		const callId = `${context.sessionId}_${context.messageId ?? 'default'}`;
+
+		return await this.pendingCalls.waitForResult(callId, tool.name, args, this.timeoutMs);
+	}
+
+	resolveToolCall(callId: string, result: unknown): boolean {
+		return this.pendingCalls.resolve(callId, result);
+	}
+
+	rejectToolCall(callId: string, error: Error): boolean {
+		return this.pendingCalls.reject(callId, error);
+	}
+
+	getPendingCallsManager(): PendingCallsManager {
+		return this.pendingCalls;
+	}
+}