Using async middleware functions with swagger node project

Question

I have generated an app using swagger-node ( https://github.com/swagger-api/swagger-node ).

The automatic swagger router is not recognizing controller middleware functions with an async prefix. I have to use Promises inside middlewares.

Is there a way to use async in the middlewares which are listed in swagger.yaml ?

in swagger.yaml:

paths:
  '/positions/{positionId}':
    x-swagger-router-controller: controller
    get:
      description: some description
      operationId: getPosition

in controllers/controller.js

module.exports.getPosition = function(request, response) {
    const positionId = request.swagger.params.positionId.value;
    try {
        someModel.getPosition(positionId)
            .then(function() {
                return response.status(200).json();
            })
            .catch(function(error) {
                return response.status(500).json();
            });
    } catch(error) {
        return response.status(500).json();
    }
};

and I would like to write:

module.exports.getPosition = async function(request, response) {
    const positionId = request.swagger.params.positionId.value;
    try {
        await someModel.getPosition(positionId);
        return response.status(200).json();
    } catch(error) {
        return response.status(500).json();
    }
};

Answer 1

This is an issue of the swagger-node-runner package (see here ) :

they need to they'd need to update their code to use the latest release of swagger-tools .

I fixed that by :

First, installing the 0.10.3 version of swagger-tools in the project :

npm install --save swagger-tools@0.10.3

Then, changing the dependency of swagger-node-runner manually in the node_modules/swagger-node-runner/package.json file, like :

[...]
    "dependencies": {
        "bagpipes": "^0.0.6",
        "config": "^1.16.0",
        "cors": "^2.5.3",
        "debug": "^2.1.3",
        "js-yaml": "^3.3.0",
        "lodash": "^3.6.0",
        "swagger-tools": "^0.10.3"
    },
[...]

Answer 2

For you to use the wait, you are using async in the creation of the function, it follows:

 module.exports.getPosition = async function(request, response) { const positionId = request.swagger.params.positionId.value; try { await someModel.getPosition(positionId); return response.status(200).json(); } catch(error) { return response.status(500).json(); } };