Invoke Business Rules service from Node js application on Bluemix - ibm-cloud

Question

I have my ruleset deployed on the Business Rules service on Bluemix.
How do I invoke the rules using API from my Node js application on Bluemix?

Answer 1

After binding the Business Rules service instance to the application, rules can be invoked using the invokeRulesService method defined as follows:
// Check for Business Rules service
var brules = null;
//parse VCAP_SERVICES if running in Bluemix
if (process.env.VCAP_SERVICES) {
var env = JSON.parse(process.env.VCAP_SERVICES);
console.log(env);
//find the Business Rules service
if (env["businessrules"])
{
brules = env['businessrules'][0]['credentials'];
console.log(brules);
}
else
{
console.log('Please bind the Business Rules service to this application');
}
}
function invokeRulesService(rulesetPath, inputParams, callback) {
// check if brules is null
if (brules == null){
console.log("Please bind the business rules service to this application.");
return;
}
var restUrl = url.parse(brules.executionRestUrl);
var dataString = JSON.stringify(inputParams);
// encode 'user:password' in Base64 string for basic authentication of the execution API
var encodedCredentials = new Buffer(brules.user+':'+brules.password).toString('base64');
headers = { 'Content-Type': 'application/json',
'Content-Length': dataString.length,
'Authorization': 'Basic ' + encodedCredentials // basic authentication header
};
var options = {
host: restUrl.host,
path: restUrl.path + rulesetPath,
method: 'POST',
headers: headers
};
var req = https.request(options, function(resp) {
resp.setEncoding('utf-8');
var responseString = '';
resp.on('data', function(data) {
responseString += data;
});
resp.on('end', function() {
console.log(responseString);
if (resp.statusCode == 200)
var responseObject = JSON.parse(responseString);
callback(responseObject);
});
});
req.on('error', function(e) {
console.log(e.message);
});
req.write(dataString);
req.end();
}