Function executeLayer

packages/core/src/server/middleware.ts:270–292

()

    let index = 0;

    const executeLayer = (): Promise<unknown> => {
      const entry = applicable[index++];
      if (!entry) {
        if (rawRequest) {
          rawRequest.params = mcpRequest.params;
        }
        return originalHandler(...args);
      }

      let nextCalled = false;

      const next = (): Promise<unknown> => {
        if (nextCalled) {
          throw new Error(
            `next() called multiple times in middleware for "${method}"`,
          );
        }
        nextCalled = true;
        return executeLayer();
      };

      return Promise.resolve(entry.handler(mcpRequest, extra, next));
    };

    return executeLayer();
  };