ewd.js on fhir - m/gatewaygradvs1.mgateway.com/download/ewdjs-vistanovo.pdf · ewd.js on fhir rob...

EWD.js on FHIR

Rob TweedM/Gateway Developments Ltd

Twitter: @rtweedEmail: [email protected]

http://www.mgateway.comWednesday, 12 March 14

mailto:[email protected]






VistA

CachéOr GT.M

EWD.js Architecture

Wednesday, 12 March 14

VistA

CachéOr GT.M

EWD.js Architecture

Mumps:- Language- Database


VistA

CachéOr GT.M

EWD.js Architecture


Exceptional NoSQL Database- high performance- highly scalable- hierachical- projectable in many ways

- key/value- graph- object- relational- document


VistA

CachéOr GT.M

EWD.js Architecture



VistA

CachéOr GT.M

EWD.js Architecture

Mumps:- Language- DatabaseWhat language as a replacement?- popular- similar good parts to Mumps language- quick & easy to develop in- natural fit with database


VistA

CachéOr GT.M

EWD.js Architecture


JavaScript- hugely popular and still growing- interpreted- dynamic- un-typed- perfect fit with database

- JSON = document database


VistA

CachéOr GT.M

EWD.jsinterfaces

Node.js(server-sideJavaScript)

EWD.js Architecture


VistA

CachéOr GT.M

EWD.jsinterfaces


HTTP(S)(Interactive

Applications)

EWD.js Architecture


EWD.jsinterfaces


VistA

CachéOr GT.M

HTTP(S)(Interactive

Applications)

WebSockets(Interactive

Applications)

EWD.js Architecture


EWD.jsinterfaces


HTTP(S)(Interactive

Applications)


Applications)VistA

CachéOr GT.MHTTP(S)

(WebServices)

EWD.js Architecture


EWD.jsinterfaces


HTTP(S)(Interactive

Applications)


Applications)VistA

CachéOr GT.MHTTP(S)

(WebServices)

Security

EWD.js Architecture


EWD.jsinterfaces


HTTP(S)(Interactive

Applications)


Applications) VistA

CachéHTTP(S)

(WebServices)

Official InterS

ystems Interface M

odule

Security

EWD.js Architecture


EWD.jsinterfaces


HTTP(S)(Interactive

Applications)


Applications) VistA

GT.MHTTP(S)

(WebServices)

NodeM

: Open S

ource reverse-engineer

Security

EWD.js Architecture


EWD.jsinterfaces


HTTP(S)(Interactive

Applications)


Applications) VistA

CachéHTTP(S)

(WebServices)

Official InterS

ystems Interface M

odule

ewdG

lobals:JS

ON

abstraction of Mum

ps Globals

Security

EWD.js Architecture


EWD.jsinterfaces


HTTP(S)(Interactive

Applications)


Applications) VistA

CachéHTTP(S)

(WebServices)

Official InterS

ystems Interface M

odule

ewdG

lobals:JS

ON

abstraction of Mum

ps Globals

Mumps Globals

Security

EWD.js Architecture


EWD.jsinterfaces


HTTP(S)(Interactive

Applications)


Applications) VistA

CachéHTTP(S)

(WebServices)

Official InterS

ystems Interface M

odule

ewdG

lobals:JS

ON

abstraction of Mum

ps Globals

Mumps Globals

Mumps Functions

Security

EWD.js Architecture


EWD.jsinterfaces


HTTP(S)(Interactive

Applications)


Applications) VistA

CachéHTTP(S)

(WebServices)

Official InterS

ystems Interface M

odule

ewdG

lobals:JS

ON

abstraction of Mum

ps Globals

Mumps Globals

FileMan APIs

Mumps Functions

Security

EWD.js Architecture


EWD.jsinterfaces


HTTP(S)(Interactive

Applications)


Applications) VistA

CachéHTTP(S)

(WebServices)

Official InterS

ystems Interface M

odule

ewdG

lobals:JS

ON

abstraction of Mum

ps Globals

Mumps Globals

FileMan APIs

Mumps Functions

Security

User B

ack-end Application logic

(JavaScript)

EWD.js Architecture


EWD.jsinterfaces


HTTP(S)(Interactive

Applications)


Applications) VistA

GT.MHTTP(S)

(WebServices)

ewdG

lobals:JS

ON

abstraction of Mum

ps Globals

Mumps Globals

FileMan APIs

Mumps Functions

Security

User B

ack-end Application logic

(JavaScript)

NodeM

: Open S

ource reverse-engineer

EWD.js Architecture


EWD.js Architecture

26

Pre-forked, constantly-running


EWD.js Architecture

27

100% StatelessAll activity handled by a small number of processes

Pre-forked, constantly-running


EWD.js Development

28

100%JavaScript


Secured Web Services

• HTTP(S) Web Services built-in• Need to prevent a free-for-all• Uses same security as Amazon Web

Services– eg for SimpleDB

29



EWD.jsServer

Registered users/clients



EWD.jsServer


Access Id+

Secure Key



EWD.jsServer


Sent toUser /client

Access Id+

Secure Key



EWD.jsServer


User/Client

HTTP Request

&timestamp=xxxxxxxx&accessId=rob12345



EWD.jsServer


User/Client

HTTP Request

Normalised

Create HMAC-SHA-256 digestusing secret key

Add:&signature=xxxxxxxxxxxxxxxx



EWD.jsServer


User/Client

Signed HTTP Request

Web S

erviceInterface



EWD.jsServer


User/Client

HTTP Request Processing

Remove &signature=xxxx

Normalise request

Extract accessId from request

Web S

erviceInterface



EWD.jsServer


User/Client



Normalise request


Get secret key for Access Id

Web S

erviceInterface



EWD.jsServer


User/Client



Normalise request



Generate HMAC-SHA256 digest

Web S

erviceInterface



EWD.jsServer


User/Client



Normalise request




- Match?

Web S

erviceInterface



EWD.jsServer


User/Client



Normalise request




- Match?

- Don't Match?

Web S

erviceInterface



EWD.jsServer


Access Id+

Secure Key+

AllowedApplications/

Modules


REST

• Growing requirement in healthcare– many projects/initiatives in VA based on

REST-ful interfaces to VistA– HL7 FHIR

• REST is a key part of the standard

42


REST



• REST is a key part of the standard– EWD.js doesn’t support REST

• implement REST interface?

43


REST



• REST is a key part of the standard– EWD.js doesn’t support REST

• implement REST interface?• instead, separate EWD REST Server

– Node.js module: Restify» de facto standard REST implementation for Node.js» tried, tested, stable, fast» customisable! 44


EWDREST Server

(Node.jsrestify)

FHIRREST

Requests

EWD.jsServer VistA

Web S

ervice Interface


EWDREST Server

(Node.jsrestify)

FHIRREST

Requests

EWD.jsServer VistA

Web S

ervice Interface

Access Id+

Secret Key+

Application List



EWDREST Server

(Node.jsrestify)

FHIRREST

Requests

EWD.jsServer VistA

Web S

ervice Interface

URL Re-writing:

REST requests rewrittenAs EWD.js HTTP WebService Requests


EWDREST Server

(Node.jsrestify)

FHIRREST

Requests

EWD.jsServer VistA

Web S

ervice Interface

ThenDigitally-signed

beforetransmission

URL Re-writing:

REST requests rewrittenAs EWD.js HTTP WebService Requests


EWDREST Server

(Node.jsrestify)

FHIRREST

Requests

EWD.jsServer VistA

Web S

ervice Interface

No Change requiredTo EWD.js


URL Re-Router• Get Observations for patient 1234 from EC2 server• http://192.168.1.2:8081/fhir/ec2/patient/@1234/observation

• Get Observations for patient 1234 from Oroville server• http://192.168.1.2:8081/fhir/oroville/patient/@1234/observation

50


http://192.168.1.2:8081/fhir/ec2/patient/@1234/observation

http://192.168.1.2:8081/fhir/ec2/patient/@1234/observation

http://192.168.1.2:8081/fhir/oroville/patient/@1234/observation

http://192.168.1.2:8081/fhir/oroville/patient/@1234/observation

REST Server(Node.jsrestify)

FHIRREST

Requests

SecureEWD.jsWeb ServiceRequest

EWD.jsServer

VistA

EWD.jsServer

VistAor otherMumpssystem

Message Router& URL Rewriter


VistA

PatientCCDA(XML)

PatientCCDA(JSON)

EWD.js / Node.js

File

_setDocument()

Stored in Mumps DB

George Lilly’swork


JSON-formatted CCDAStored in Mumps

Or MongoDB

getVitals():JSON-format

Josh Mandel’sBlue-button logic

Adapted for EWD.js

EWD.js

getObservation(): HL7 FHIR JSON-format

Forwarded to FHIR REST Server

VistA

getVitals(): HL7 FHIR

JSON-format

Mumps functionAPI wrapper

EWD.jsBack-end

FHIRModule



FHIRREST

Requests

SecureEWD.js

Web ServiceRequests

EWD.jsServer

GT.M:CCDA

Database

EWD.jsServer

GlobalsDB

EWD.jsServer

GT.M

Blood-pressureApplication

George Lilly’s Rackspace Server

Rob’s EC2 Server

VistA

FHIR Module

FHIR Module



FHIRREST

Requests

SecureEWD.js

Web ServiceRequests

EWD.jsServer

GT.M:CCDA

Database

EWD.jsServer

GlobalsDB

EWD.jsServer

GT.M

Blood-pressureApplication


Rob’s EC2 Server

VistAMy HouseS.E England

My HouseS.E England

RackspaceCloud USA

AmazonCloud USA

YouUSA? FHIR Module

FHIR Module


Try it

• https://www.mgateway.com:38080/ewd/FHIRDemo/index.html

• Username: rob• Password: secret

• Note: not designed for use with IE!– use Chrome, Firefox or Safari

56


https://www.mgateway.com:38080/ewd/FHIRDemo/index.html





FHIRREST

Requests

EWD.jsServer

GT.M:CCDA

Database

EWD.jsServer

GlobalsDB


Rob’s EC2 Server

VistA

HL7 FHIRObservation

FHIR Module

FHIR Module


EWD.js in relation to:

• VistA Novo• VSA

59


VistA

ESB

VSAAdapter

(VMRCA)

VSACalling Service

(VMRCS)

Web Service Interface

RegionalVistA SOAFederatingServicesPlatform(Java)

VistA

VSAAdapter

(VMRCA)

VSACalling Service

(VMRCS)


VistA

VSAAdapter

(VMRCA)

VSACalling Service

(VMRCS)



VSA Architecture as currently proposed


VistA

VSAAdapter

(VMRCA)

VSACalling Service

(VMRCS)


VistA

VSAAdapter

(VMRCA)

VSACalling Service

(VMRCS)


VistA

VSAAdapter

(VMRCA)

VSACalling Service

(VMRCS)


VSA / VistA Novo potential integration (1)

ServiceInvocation

DataStorageCache

FHIRServices

FHIRRequests/Responses

VistA Novo


VistA

VSAAdapter

(VMRCA)

VSACalling Service

(VMRCS)



VistA

VSAAdapter

(VMRCA)

VSACalling Service

(VMRCS)


VistA

VSAAdapter

(VMRCA)

VSACalling Service

(VMRCS)




ServiceInvocation

DataStorageCache

FHIRServices


VistA Novo


VistA

ESB

VSAAdapter

(VMRCA)

VSACalling Service

(VMRCS)



VistA

VSAAdapter

(VMRCA)

VSACalling Service

(VMRCS)


VistA

VSAAdapter

(VMRCA)

VSACalling Service

(VMRCS)




ServiceInvocation

DataStorageCache

FHIRServices


VistA Novo


VistA

EWD.js-compatibleVSA

Interface(Mumps wrapper

function)

EWD.js / VSA Integration – step 1

VSA Wizard

Add new output optionfrom wizard that creates

a Mumps wrapper functionthat conforms with EWD.js

approach


VistA

EWD.js/VSAAdapter

VistA

VistA EWD.js(Node.js)

HTTP WebService

Interface EWD RESTServer(Node.js)

FHIRparser

EWD.js(Node.js)

HTTP WebService

Interface

FHIRparser

EWD.js(Node.js)

HTTP WebService

Interface

FHIRparser


SignedHTTPSRequests

EWD.js / VSA VistA Novo Equivalent (1)

EWD.js/VSAAdapter

EWD.js/VSAAdapter


VistA

EWD.js/VSAAdapter

VistA


HTTP WebService

Interface

EWD RESTServer(Node.js)

FHIRparser

EWD.js(Node.js)

HTTP WebService

Interface

FHIRparser

EWD.js(Node.js)

HTTP WebService

Interface

FHIRparser


SignedHTTPSRequests

EWD.js / VSA VistA Novo Equivalent (2)Regionalised



EWD.js/VSAAdapter

EWD.js/VSAAdapter


VistA

EWD.js/VSAAdapter

VistA


HTTP WebService

Interface


FHIRparser

EWD.js(Node.js)

HTTP WebService

Interface

FHIRparser

EWD.js(Node.js)

HTTP WebService

Interface

FHIRparser


SignedHTTPSRequests

EWD.js / VSA VistA Novo Equivalent (3)Redundant



EWD.js/VSAAdapter

EWD.js/VSAAdapter


VistA

EWD.js/VSAAdapter

VistA


HTTP WebService

Interface

FHIRparser

EWD.js(Node.js)

HTTP WebService

Interface

FHIRparser

EWD.js(Node.js)

HTTP WebService

Interface

FHIRparser

EWD.js / VSA VistA Novo Equivalent (4)Using ESB



ESBEWD.js/VSAAdapter

EWD.js/VSAAdapter


VistA

EWD.js/VSAAdapter

VistA


HTTP WebService

Interface

FHIRparser

EWD.js(Node.js)

HTTP WebService

Interface

FHIRparser

EWD.js(Node.js)

HTTP WebService

Interface

FHIRparser

EWD.js / VSA VistA Novo Equivalent (5)Using ESB



ESBEWD.js/VSA

Adapter

EWD.js/VSAAdapter


Try it all out

• Christopher Edwards (OSEHRA)– VistA Installer

• VistA up and running in 30 minutes• includes EWD.js and EWD REST Server

– fully installed, configured and running– example applications– example REST services

• Full details:• http://www.osehra.org/blog/ewdjs-and-vista-ready-use-30-minutes

70


More security details

• Detailed summary of EWD.js security for:– interactive (WebSocket) applications;– HTTP-based Web Services– REST

• Read:• http://robtweed.wordpress.com/2014/03/10/ewd-js-application-web-service-and-rest-security/

71


http://robtweed.wordpress.com/2014/03/10/ewd-js-application-web-service-and-rest-security/

http://robtweed.wordpress.com/2014/03/10/ewd-js-application-web-service-and-rest-security/

EWD.js on FHIR

Copy of slides:http://gradvs1.mgateway.com/download/EWDjs-VistANovo.pdf

Rob TweedM/Gateway Developments Ltd

Twitter: @rtweedEmail: [email protected]


http://gradvs1.mgateway.com/download/EWDjs-VistANovo.pdf

http://gradvs1.mgateway.com/download/EWDjs-VistANovo.pdf



ewd.js on fhir - m/gatewaygradvs1.mgateway.com/download/ewdjs-vistanovo.pdf · ewd.js on fhir rob...

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