How to use Cloud Functions for Firebase to write a SOAP service?

Question

I need to implement an soap web service using firebase functions. I found a module called soap-node soap-module-github which seems promising, since it integrates with express, and firebase says it uses express for http calls, but the problem, is I don't know how to integrate that module with firebase functions since, firebase functions are the handler of the http calls made by the clients, any help would be very helpfull.

Here is the code I have managed to create so far:

    var fs = require('fs'),
    soap = require('soap'),
    express = require('express'),
    lastReqAddress;
    var server = express();
    service = {
        StockQuoteService: {
            StockQuotePort: {
                GetLastTradePrice: function (args, cb, soapHeader) {
                    if (soapHeader)
                        return {
                            price: soapHeader.SomeToken
                        };
                    if (args.tickerSymbol === 'trigger error') {
                        throw new Error('triggered server error');
                    } else if (args.tickerSymbol === 'Async') {
                        return cb({
                            price: 19.56
                        });
                    } else if (args.tickerSymbol === 'SOAP Fault v1.2') {
                        throw {
                            Fault: {
                                Code: {
                                    Value: "soap:Sender",
                                    Subcode: {
                                        value: "rpc:BadArguments"
                                    }
                                },
                                Reason: {
                                    Text: "Processing Error"
                                }
                            }
                        };
                    } else if (args.tickerSymbol === 'SOAP Fault v1.1') {
                        throw {
                            Fault: {
                                faultcode: "soap:Client.BadArguments",
                                faultstring: "Error while processing arguments"
                            }
                        };
                    } else {
                        return {
                            price: 19.56
                        };
                    }
                },

                SetTradePrice: function (args, cb, soapHeader) {},

                IsValidPrice: function (args, cb, soapHeader, req) {
                    lastReqAddress = req.connection.remoteAddress;

                    var validationError = {
                        Fault: {
                            Code: {
                                Value: "soap:Sender",
                                Subcode: {
                                    value: "rpc:BadArguments"
                                }
                            },
                            Reason: {
                                Text: "Processing Error"
                            },
                            statusCode: 500
                        }
                    };

                    var isValidPrice = function () {
                        var price = args.price;
                        if (isNaN(price) || (price === ' ')) {
                            return cb(validationError);
                        }

                        price = parseInt(price, 10);
                        var validPrice = (price > 0 && price < Math.pow(10, 5));
                        return cb(null, {
                            valid: validPrice
                        });
                    };

                    setTimeout(isValidPrice, 10);
                }
            }
        }
    };
    var wsdl = fs.readFileSync(__dirname + '/../wsdl/stockquote.wsdl', 'utf-8').toString();
    server = express();

    soapServer = soap.listen(server, '/stockquote', service, wsdl);

here is the stockquote.wsdl:

I have googled very good I just don't find some path , I also searched google functions and their integration with soap, since firebase functions are just google cloud functions used for firebase

user_1028647 · Answer

Peeking at the source code for node-soap, you should be able to directly pass the _requestListener to the Cloud Function's onRequest function:

exports.stockquote = functions.https.onRequest(soapServer._requestListener)

user_3098404 · Answer

You can use express with cloud functions now :

server = express();
server.listen(5002, function () {
  soap.listen(server, '/stockquote', service, wsdl);
});

exports.stockquote = functions.https.onRequest(server);

Put the route in firebase.json :

 "rewrites": [
   {
    "source": "/stockquote",
    "function": "stockquote"
   }
 ]

When testing on the client using javascript don't forget to change the endpoint to override localhost in wsdl :

var soap = require('soap');
var url = 'https://[your-project-id].firebaseapp.com/stockquote?wsdl';
var args = {tickerSymbol: 'some symbol', price: 100.0};

var options = {
    'endpoint' : 'https://[your-project-id].firebaseapp.com/stockquote'
};

soap.createClient(url, options, function(err, client) {
    if (err) throw err;
    //print service in json
    console.log(client.describe());
    client.GetLastTradePrice(args, function(err, result) {
        if(err)
            console.log("err = "+ err.message);
        console.log(result);
        res.status(200).send(result);
    });
});

How to use Cloud Functions for Firebase to write a SOAP service?

3 Answers