VRO: Read/Write Service Now

3 minute read

Description:

I use the following snippets to have vRealize Orchestrator connect to Service Now and perform read and write operations.

To Resolve

  1. So let’s pretend you have a workflow you want to run every minute that scans Service Now for a certain Catalog Item response. First you would add your ServiceNow REST HOST and add the GET operation to VRO’s inventory.

  2. You would then add the rest operations for Service Now as variables to your workflow. We will add snGetRequest and snPutRequest to an example workflow.

  3. Then, pull over a scripting element and add them as ‘inputs’ to the script. Now paste in:

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    function restAPICall(restOperation, content, defaultContentType, acceptHeaders, urlTemplateCustom) {
       System.log("==========Generic Rest API call==========");
       var inParamtersValues = [];
       var headerParams = [];
       var acceptHeadersValue = "";
       restOperation.urlTemplate = urlTemplateCustom;
       System.log(restOperation.getHeaderParameters());
       var request = restOperation.createRequest(inParamtersValues, content);
       //set the request content type
       if (System.getModule("com.vmware.library.http-rest.configuration").hasHttpMethodHasBodyPayload(request.getMethod())) {
          System.log("Setting defaut content type to:  " + defaultContentType);
          request.contentType = defaultContentType;
       }
       var headerParamNames = restOperation.getHeaderParameters();
       //System.log(" acceptHeaders " + acceptHeaders );
       if (acceptHeaders && acceptHeaders.length > 0) {
          for (var k in acceptHeaders) {
             acceptHeadersValue = acceptHeadersValue + acceptHeaders[k] + ",";
          }
          var acceptHeadersStringSize = acceptHeadersValue.length - 1;
          acceptHeadersValue = acceptHeadersValue.substring(0, acceptHeadersStringSize);
    
       }
       for (var k in headerParamNames) {
          System.log(" SET headers: " + headerParamNames[k] + " : " + headerParams[k]);
          request.setHeader(headerParamNames[k], headerParams[k]);
       }
       System.log("Request: " + request);
       System.log("Request URL: " + request.fullUrl);
       var response = request.execute();
       System.log("Response: " + response);
       statusCode = response.statusCode;
       statusCodeAttribute = statusCode;
       System.log("Status code: " + statusCode);
       contentLength = response.contentLength;
       headers = response.getAllHeaders();
       contentAsString = response.contentAsString;
       //System.log("Content as string: " + contentAsString);
       System.log("****Headers****");
       for (var header in headers) {
          System.log(header.toString());
       }
       return contentAsString;
    }
    
    System.log("==========Get Example Requests from Service Now and needed fields==========")
    var content = ""
    var defaultContentType = "application/json"
    var acceptHeaders = "application/json"
    function get() {
       //URL that can be custom
       urlTemplate = "https://test.service-now.com/api/now/table/sc_request?sysparm_query=short_description%3DExample%20Request&sysparm_limit=10&state=1"
       restAPICall(snGetRequest, content, defaultContentType, acceptHeaders, urlTemplate)
       System.log("Preparing JSON Response: ")
       System.log("this is the content " + content)
       //PARSE JSON INTO A VARIABLE
       var response = JSON.parse(contentAsString)
       //SHOW TOTAL NUMBER OF REQUESTS
       System.log("Total number of Example Requests: " + response["result"].length)
       return response
    }
    
    // Set variables from Service Now
    var openExampleRequests = get()
    // This will cause the workflow to error when there are 0 Service Now Requests. That is okay because we trap it below. See bottom of this file
    var requestNumber = openExampleRequests["result"][0]["number"]
    System.log("Request Number: " + requestNumber)
    
    var utaID = openExampleRequests["result"][0]["u_ut_id"]
    System.log("EmplID of the requestor: " + utaID)
    var sys_ID = openExampleRequests["result"][0]["sys_id"]
    System.log("SysID of the Service Now Service Now Request: " + sys_ID)
    
    var description = openExampleRequests["result"][0]["description"]
    var splitDesc = description.split("\n")
    
    
  4. The code above does a couple of things:

    • First it defines a generic REST API function that you can use to pass custom calls
    • Then in another function, it calls the first function (line 53) and it specifically searches for: ‘short description = Example Request’ with a limit of 10 entries and a state=1 which is ‘new’
    • Lastly, it starts to parse the fields from ServiceNow and put them into variables (line 64+). In order to see what you are working with, it is highly advised to first make this call in Postman or Powershell and work from there.
    • Notice this (line 53) is where it uses the variable snGetRequest which is defined in step 1.
  5. Now, you perform whatever actions you want. Then towards the end of the workflow, you can update the Service Now Request like so:

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    System.log("==========Update the Service Now Request in Service Now==========")
    var content4 = {
       "state": "12",
       "assigned_to": "c86bf948db9a0058d48b6sd887e65ce961979"
    }
    var changeContent4 = JSON.stringify(content4)
    var defaultContentType4 = "application/json"
    var acceptHeaders4 = "application/json"
    var snowURLTemplate = "https://test.service-now.com/api/now/table/sc_request/" + sys_ID
    restAPICall(snPutRequest, changeContent4, defaultContentType4, acceptHeaders4, snowURLTemplate)
    
    • This will update the Service Now Request to “waiting for other tasks”
    • Notice this (line 10) is where it uses the variable snPutRequest which is defined in step 1.
  6. If you want to close the Service Now Request, just change the state to the needed code to close the Service Now Request and do the same PUT request with that code int the body instead of code 12.

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