1 presentation will begin momentarily…. 2 service stub and transparent proxy: wilma innovation we...

Presentation will begin momentarily…

Service Stub and Transparent Proxy: Wilma

INNOVATION WE MUST DO

AUGUST 24, 2015

AGENDA

Test Situation1

Requirements to address the issues2

Tool: Wilma3

How it works?4

Capabilities / Features5

Future6

THE TEST SITUATION – COMPONENT/SERVICE

Request TESTEDCOMPONENTResponse

3rd partyComponent

TESTEDCOMPONENT

Request 3rd partyComponentResponse

TESTEDCOMPONENT

Request 3rd partyComponentResponse

3rd partyComponent

TESTEDCOMPONENT

Request

Response? missing new feature

3rd partyComponent

TESTEDCOMPONENT

Request

Response

TESTEDCOMPONENT

Request

Response

- No answer- Malformed answer

- invalid content-length

- invalid content-type- Errors in response

- E50x, E404, etc- Delayed answer,

Timeout

3rd partyComponent

TESTEDCOMPONENT

Request

Response

3rd partyComponent

TESTEDCOMPONENT

Request

Response

3rd partyComponent

TESTEDCOMPONENT

Request

Response

3rd partyComponent

THE TEST SITUATION – @ MICROSERVICES

TESTEDCOMPONENT

Request

Response

3rd partyComponent

REQUIREMENTS

• We must monitor the messages between the components/services• so we need a Transparent Proxy that captures the messages

• We must generate component/service responses • so we need a highly configurable Service Stub

• That means static and dynamic response contents• Any message types and contents: HTML, XML, SOAP, JSON, REST, etc

• We must handle HTTP, HTTPS requests, even 2-way SSL• We need intelligent selection between Proxying the request or generate Stub response• We need easy integration with CI environments, test-automation friendly configuration• The solution should be robust and very stable• Shall offer extensibility

THE SOLUTIONTHE SOLUTION: WILMA

HOW WILMA WORKS?

TESTEDCOMPONENT

Request

Response

3rd partyComponent

HOW WILMA WORKS?

HOW WILMA WORKS? – Information-flow Diagram

HTTP/HTTPSRequest

Wilma Marker Switch proxy

Route Engine

PROXY / STUB

WilmaWebApp

WilmaWebAppReq

UI Config / Status

Message Template Set

Message Logging Queue

HTTP/HTTPS Response

STUB Response

-FIS, -gzip

STUB Response Request Response Generator

Response

Response Queue

-FIS, -gzip +FIS, +gzip

HTTP/HTTPS Response

HTTP/HTTPSRequest

HOW WILMA WORKS? – Transparent Proxy

HTTP/HTTPSRequest

Route Engine

PROXY / STUB

WilmaWebApp

WilmaWebAppReq

UI Config / Status

HTTP/HTTPS Response

STUB Response

-FIS, -gzip

Response

Response Queue

HTTP/HTTPS Response

HTTP/HTTPSRequest

HOW WILMA WORKS? – Message Logging

HTTP/HTTPSRequest

Route Engine

PROXY / STUB

WilmaWebApp

WilmaWebAppReq

UI Config / Status

HTTP/HTTPS Response

STUB Response

-FIS, -gzip

Response

Response Queue

HTTP/HTTPS Response

HTTP/HTTPSRequest

HOW WILMA WORKS? – Handling a Request as Proxy

HTTP/HTTPSRequest

Route Engine

PROXY / STUB

WilmaWebApp

WilmaWebAppReq

UI Config / Status

HTTP/HTTPS Response

STUB Response

-FIS, -gzip

Response

Response Queue

HTTP/HTTPS Response

HTTP/HTTPSRequest

HOW WILMA WORKS? – Handling a Request as Stub

HTTP/HTTPSRequest

Route Engine

PROXY / STUB

WilmaWebApp

WilmaWebAppReq

UI Config / Status

HTTP/HTTPS Response

STUB Response

-FIS, -gzip

Response

Response Queue

HTTP/HTTPS Response

HTTP/HTTPSRequest

HOW WILMA WORKS? – Configuring the Stub Service

• Configuration file: XML files• Request/Response pairs are defined as

• Condition Descriptors and Response Descriptors• Request – Condition Descriptors• Built-in Conditions (check header / body content)• Several conditions can be combined (and/or) and negated• External conditions can be used

• Response – Response Generation• Template files can be used (static answer)• Built-in Template Formatters can be used to alter the templates• Response can be generated (dynamic answer)• External Template Generators and Template Formatters can be used

• And so on (delay the response, malformed responses, Exxx responses…)

HOW WILMA WORKS? – Configuring the Stub Service

WHERE WILMA CAN BE USED?

• Local development environment – analyse messages, stub services• CI environment – can stub surrounding services of the tested service• Integration test environment – analyse messages, stub services

HOW WILMA CAN BE USED?

• As proxy (even if STUB mode is used only):

• Single Wilma instance can serve many services in parallel

TESTEDCOMPONENT

Request

Response

3rd partyComponent

• Even can be used with microservices

Service A

Service BService D

Service EService H

Service C

Service I

Service G

Service F

SHOW WILMA IN ACTION!

• Config1 + https://info.epam.com/en/news.html• Config2 + https://info.epam.com/register

WHAT WILMA OFFERS IN ADDITION?

OPERATION MODES

Wilma1

Exclusive PROXY2

Exclusive STUB3

OPERATION MODE – Exclusive PROXY Mode

HTTP/HTTPSRequest

Route Engine

PROXY / STUB

WilmaWebApp

WilmaWebAppReq

UI Config / Status

HTTP/HTTPS Response

STUB Response

-FIS, -gzip

Response

Response Queue

HTTP/HTTPS Response

HTTP/HTTPSRequest

OPERATION MODE – Exclusive STUB Mode

HTTP/HTTPSRequest

Route Engine

PROXY / STUB

WilmaWebApp

WilmaWebAppReq

UI Config / Status

HTTP/HTTPS Response

STUB Response

-FIS, -gzip

Response

Response Queue

HTTP/HTTPS Response

HTTP/HTTPSRequest

• INTERCEPTORS• Both Request and Response can be intercepted• Any operation on the intercepted message can be performed• External Interceptor classes can be used

Service A Service B

INTERCEPTOR EXAMPLE – A CIRCUIT BREAKER

• Need stub configuration – to provide response instead of B, in case B is in bad shape

• An interceptor evaluates the responses• If Service B gave bad response:

– turns on STUB for Service B– After a defined timout turns off STUB for Service B

• RUN-TIME CONFIGURATION• Stub configuration• Upload and download templates, classes, jars, messages

RUN-TIME CONFIGURATION OF WILMA VIA UI

• BROWSE/SEARCH ON LOGGED MESSAGES• Via Wilma UI itself• Via Wilma Message Search Application

MESSAGE BROWSING VIA WILMA UI

MESSAGE BROWSING VIA WILMA MESSAGE SEARCH

• Wilma Message Search application• high performance search engine, • offers searching of the request-response pairs those were logged by Wilma• Correlation ID

• API• Stub configuration• Upload and download templates, classes, jars, messages• Load information

WILMA HTTP API

WILMA-SERVICE-API LIBRARY

• Built-in Safeguards• Maintains amount of messages saved onto disk – no run out of disk space

• Built-in Safeguards• Self protecting machanisms against overload• Load information is available

•Open Sourced under license GNU GPL v3.0

•Available via GitHub, including documentation

•Feedbacks are welcome and as well as contribution

FUTURE OF WILMA

• .NET API

•Service API lib enhancements

•Promotion within EPAM and

for Customers

•Depends on the OS community

Any Questions?

Wilma is @ https://github.com/epam/Wilma

AUGUST 24, 2015

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