#REST API

This article gives a brief introduction how a RESTful service consumer and a RESTful service provider exchange data. It is a beginner’s guide. Data is transferred from a consumer to a provider as parameters of the service. Parameters are part of a service request. The result of the service action a response is returned from a provider to a consumer. Both the service request and response are standard HTTP messages. Since HTTP is a flexible standard regarding to the message contents, RESTful services also enjoy the versatility of data transfer methods.

The article is a step by step guide for beginners to learn how to build a RESTful web service consumer (or client) in Ensemble. The provider can be any RESTful service, but the example is based on the service we made during the previous sessions.

It is more than obvious that many client development environment has programming libraries or containers to build a RESTful client. For example in the earlier sessions we used Java Script to access services. Ensemble as a container also offers client functionality. Let us have a quick list what Ensemble offers.

Hi all,

We're creating a series of RESTful APIs that output data from a Cache database (made up of global storage that we've mapped to classes). I'm running into some problems with object-to-JSON conversions when relationships are involved.

Cross-origin Resource Sharing (CORS) is one of the basic security features built into browsers. CORS controls accessing resources from a HTML page in domains other than the original domain. It is particularly important for AJAX calls. Since RESTful services can be used as data provider to any AJAX call, you have to be able to control cross-origin access. By default services are not allowed to do CORS. You are going to learn how to enable it for Ensemble RESTful services.

The Resource Map class (the subclass of %CSP.REST) controls whether CORS is enabled. There are two approaches to do.

A beginners guide to develop Ensemble RESTful web services.

Background

Before you start reading this short introduction please go through the on-line documentation of Ensemble with special attention to chapter “Creating REST services and clients with Ensemble”.

The approach in the documentation is undisputable the fastest and easiest way to create RESTful services. As a beginner I went through the documentation and I had several questions. This short article is listing those questions plus my humble answers.

When I refer to documentation I mean Ensemble 2016.2 and onwards.

Do you have any experience / recommendations / best practice on how to update server-side data residing in a Cache database via a REST service?

A naïve approach would be to send a full JSON representation of the data object via an http POST to a method on a REST handler class: 

<Route Url="/mydata/:id" Method="POST" Call="Update"/>

The problem I see here is, if only one of the data object's properties has changed, how do we know which? Or do we simply overwrite all properties? 

Hi-

This almost seems like a silly question, but I am new to REST services.

I have a rest service that has a method for adding records to my database. 

<Route Url="/userdetails" Method="POST" Call="SaveUserDetails"/>
 

My REST client sends data using json in the body of the request.  I have verified using debugging tools that the data is actually being sent.

On the server side in my SaveUserDetails method where do I find the json?

What is the proper way to serialize that json into an object?

Some time ago, I was started to work at a new company even in other country, and more important in a different sphere when I have not been worked before, in HealthCare. It's a very new project even for company. Since I have not experience in HealthCare, I looked at what I can use in my project, and found that I should not reinvent the bicycle, and think about how to store all my data which I need and how to get access to this data. And I can use FHIR, which is looks like everything what I need, what else I need it's just a client.

Hi,

We are trying to implement a client side data provider as a component (ZEN) that will use JQuery to do rest calls to a desired URL, in this case, a %CSP.Rest service implemented by ourselves.

This component will be used within our application that is authenticated with a correct user configured on Caché management portal and therefore using one license unit. As we are using a Ajax call from client side this connection creates a new session that will use a new license.

Problem: I have a REST broker, and if I hit a code block, which does IO redirection, the REST reply becomes broken in one of the following ways:

• Binary output
• No output
• First 4096 characters of the reply are missing

Consider the following REST broker:

Class A.REST Extends %CSP.REST
{

XData UrlMap
{
<Routes>
<Route Url="/Test/:redirect" Method="GET" Call="Test"/>
 </Routes>
}

ClassMethod Test(Redirect As %Boolean = {$$$YES}) As %Status
{
    Set str = $TR($J("",4098)," ","1") // Get a string with the length of 4098 symbols
    
    Do:Redirect .

I cant find any description on how to read custom http request headers in a REST service.

On some occations i want to read http headers passed along when customers uses our REST API or headers added by the CND provider. Does anyone know how to read these http headers?

For example:
cloudflair.com sends a vistors country information along to the server using a customer http header called "CF-IPCountry". We would like to read this information and use it for statistics.

Hi all,

 I already enabled the IIS configuration for using HTTPS to all requests (using * wildcard) and all my CLS, CSP and ZEN pages are working nice through HTTPS.

 My REST Business Service parameters and Method definition:

Class ocx.bs.rest.Service Extends EnsLib.REST.Service
{
Parameter ADAPTER = "EnsLib.HTTP.InboundAdapter";
Parameter EnsServicePrefix = "/CUSTOMERS";

Method OnProcessInput(pInput As %Stream.Object, Output pOutput As %Stream.Object) As %Status

Thanks a lot,

 Angelo Braga

Hi,

I want to create a table with a dynamic display of data using the DataGrid.

On the page there  dataCombo and the table.

According to the plan, when the user selects an item in dataCombo the table is filled with data. If select another item - data is updated.

But in fact, the data in the table are loaded once when the page is loaded, and when I select value in DataCombo, I receive an error:

I would be happy if you tell me how to fix it.

Thank you.

XData Contents [ XMLNamespace = "http://www.intersystems.com/zen" ]
{
<page xmlns="http://www.intersystems.

Today I'm releasing a new EWD 3 module - ewd-feder8.

ewd-feder8 is a federation or integration platform, built as an extension of the EWD 3 ewd-xpress module.  So what does it do and what's it for? 

It's all about federating and integrating multiple web or REST service end-points.

At its simplest you can use it as a proxy server in front of a remote web service or REST end-point.

More usefully, you can send an HTTP or REST request to ewd-feder8, which can then forward it to every member of a group of web service or REST end-point servers.

I installed MDX2JSON and DeepSeeWeb 1.4.46b on this version of Caché (actually HealthShare) 

Cache for Windows (x86-64) 2016.1 (Build 656U) Fri Mar 11 2016 17:42:42 EST

I works well for the most part but my buttons contain characters that should not be there. Here is a screen shot. Does anyone recognize what the issue might be?

In this article I'll describe how to set up web services and/or REST services using EWD 3.

Since EWD 3 is designed to be modular, you can construct the environment that exactly meets your needs, but for much of the time you'll probably find that the pre-built EWD 3 ewd-xpress super-module does most of what you need because it hooks together all the core EWD 3 and other building-blocks you'll need:

• the Node.js web server that pretty much everyone now uses: Express
• Caché (via the ewd-qoper8-cache module, which, in turn, relies on the cache.

As Rob explained in an earlier post, Caché's Node.js interface allows you to create Web Services and REST Services using the very modular EWD 3 framework.

These services by default return a JSON response with Content-Type: application/json and the response body contains the JSON you return using the finished() method, so:

finished({ test: 'test response' });

returns

{ "test": "test response" }

with a HTTP content-type of application/json

For other external services and tools like e.g.

Hello,

I am looking for a routine or global that can help me see what is the  REST Operation output. Similar to  ISCSOAP for SOAP web services operation.

Thanks

Raghu

I need to call Ensemble Business Operation by sending authorised (basic auth, cache user) HTTP request (REST-like). How can I achieve that?

Maybe configure a Business Service, but which one has this functionality?

Hello, our customer, large industrial company, is considering modernizing their old CSP application so it can run on multiple client device types, using responsive design.

They have a lot of experience with CSP and some ZEN.

They are new to REST and have some limited knowledge of javascript - perhaps not enough to the extent used by client framework.

Does anyone have a framework or a set of templates that you would be willing to share?

Thank you!

Dan Kutac 

This question came on the Ensemble in Healthcare email list. It's a great question. I'm working on an answer, but am posting it here to get any other input. I'll also address the option of using %CSP.REST.

Hello everyone,

Using Intersystems Healthshare/Ensemble, I am trying to make a RESTful Interface between Android/iOS app and Cache database. I have some queries and I am unable to find where exactly I can get any resources on them.

1. By extending the EnsLib.REST.

Our company is looking for someone with expert object script skills and experience developing with REST using Caché. We have an existing application that currently supports a mobile application and a web application. The API is up and running but we need another developer to add new features and keep up with demand.

Experience with Amazon AWS is highly desired as the api is running on Windows in EC2. Familiarity with GitHub is also required.

Pay can be negotiated on a per hour basis after you provide an estimate for the time required to complete a given feature.

I was trying to modify the REST.DocServer sample in the SAMPLE namespaces to use the new %Object and %Array system objects (Ensemble 2016.2 build 636) with the following changes:

/// This method returns a list of namespaces for this server

ClassMethod GetNamespaces() As %Status

{

    #dim tSC As %Status = $$$OK

    #dim tList,tNS,tFilteredList,tValue As %String

    #; Get the list of namespaces

    Do List^%SYS.NAMESPACE(.

Getting around to wrapping up a short tour in Professional Playtime, I wanted to share my experience at the HIMSS FHIR Connectathon I participated in out in Indy in April.

A quick note about the venue, aside from the sponsors, and those who put this thing on... great job.  The venue was amazing, hosted by/at the beautiful campus of Eskenazi Health and in a city that really gave a damn about innovations in our space.  The food was great, the caffeine was continual, and was even rescued by the great host Brian Norris (Ryan Seacrest of Connectathons

Starting off with a working REST interface, I can access the CSP Application definition screen for the application  (System > Security Management > Web Applications > Edit Web Application), and "turn off" the application by clearing the Enabled: [ x ] Application checkbox. From then on my REST calls return an HTTP 404 error. (That's expected).

However - one expects that re-enabling the Application in the CSP Application screen, would return my REST services to a working state, however, this is not happening.  All REST requests continue to return an HTTP 404 error.

I have a Cache classes with %TimeStamp (e.g. 2016-04-18 12:29:11) and %Date (eg. 64027) properties. And I have a javascript client app, which needs full CRUD over this properties.

But in javascript date/time are defined by ISO8601 (e.g. timestamp 2016-04-18T12:29:11Z, date 2016-04-18).

Presenter: André Cerri
Task: Use third-party visualization tools to present your DeepSee data
Approach: Use DeepSee REST services to access DeepSee data from third-party tools
 

Come see examples of how you can use popular 3rd party data visualization tools to access your DeepSee data.

Content related to this session, including slides, video and additional learning content can be found here.

Hi

I have been experimenting with the creation of a set of REST services for an app.  The basic GET operation is set to create a %ZEN.proxyObject instance, and then set an instance of a Persistant class as a property, which gives me all of the values I want to return.  However, it also gives me some values that I don't want to return over REST (because they are both private, and large registered objects which will bog down performance)

How do I remove these values from the ZENproxyObject?

I believe the I have followed the instructions to attach a document to the body of a post request but nothing is being sent out in the files{} port of the request.  I can either get the stream in "data", not visible at all, or visible but no form data. Any help would be appreciated, below is what I have:

ClassMethod SendFax(phone As %String, coverpath As %String, docpath As %String) As %String
{
     Set req = ##class(%Net.HttpRequest).%New()
    //test server
    Set req.Server = "httpbin.org"
    Set req.SSLConfiguration = "CardChoice"
    
    Do req.InsertFormData("Username",##class(HData.

RESTful API Call From Cache to Particle.io Electron

Tom Fitzgibbon | Multidata | 212-967-6700 x537 | tom@mul.com

Summary: Simple Blink Tutorial for Particle.io Electron Device from Cache

Electron device is a tiny ARM processor ($40-$60) that connects to Particle’s world wide leased 2G/3G network (about $3/mo) and runs off an included LiPo battery. Using Cache’s %Net.HttpRequest you can send/receive data, control hardware and read sensors.

Step by Step (about 1 hour)

1) Get the Electron from store.particle.io.

2) Set up the Electron from setup.particle.io.