Baking a Microservice PI(e)

BAKING ABAKING A
MICROSERVICE PI(E)MICROSERVICE PI(E)
Antonio Goncalves and Roberto Cortez
1

INTRODUCTIONINTRODUCTION
Welcome to Devoxx UK
Hope it’s not too early…
… and that you are ready for a 3h session
Thank you for joining us
2 . 1

ANTONIO GONCALVESANTONIO GONCALVES

LISTEN TO OUR STORYLISTEN TO OUR STORY
This talk is about our journey…
… through a Microservices architecture
We’ll progressively build a MS architecture
Going from problem, to solu on…
… to problem, to solu on…
… to problem
And end‐up building a (basic) distributed applica on
2 . 4

ARCHITECTUREARCHITECTURE
Microservices
Monitoring
Conﬁgura on
Discovery Mechanism
Load Balancing
Circuit Breaker
Gateway
Security
2 . 7

HARDWAREHARDWARE
Local machine
12 Raspberry PIs
6 Servers (Orange + Red)
2 Infrastructure (Purple)
4 Clients (Black)
1 Router
3 Switches
Allows us to plug/unplug
2 . 8

SOFTWARESOFTWARE
Java / Angular (TypeScript)
Micro Proﬁle
TomEE / Wildﬂy Swarm
NGinx / ELK
Ne lix OSS
Consul
Tribestream Access Gateway
2 . 9

INFRASTRUCTUREINFRASTRUCTURE
HypriotOS
Ansible
Docker
Docker compose
2 . 10

DATABASEDATABASE
Well…
… H2 in‐memory
2 . 11

THAT’S WHAT WE WILL BE BUILDINGTHAT’S WHAT WE WILL BE BUILDING
DURING THESE 3 HOURSDURING THESE 3 HOURS
2 . 12

MICRO SERVICESMICRO SERVICES
Have you heard about Microservices ?
Who uses with Microservices ?
Who plays with Microservices ?
Who likes Microservices ?
Who suﬀers with Microservices ?
Do you know how big is a "micro" ?
3 . 1

WHAT DO PEOPLE MEAN BY MICROWHAT DO PEOPLE MEAN BY MICRO
SERVICES ?SERVICES ?
3 . 2

PROMISE, WE WON’T TALK ABOUT PIZZAS !PROMISE, WE WON’T TALK ABOUT PIZZAS !
3 . 3

SO, WHY MICROSERVICES ?SO, WHY MICROSERVICES ?
Business focused (bounded context)
Deliver new features quicker
Smaller, more agile teams
Scale services independently
Address unpredictable loads
Cloud
3 . 4

LET’S START SIMPLELET’S START SIMPLE
We have one Number API Microservice
We have one Angular client
We use 2 PIs
How do we deploy and make this run?
4 . 1

4 . 2

SEVERAL WAYS TO DEVELOPSEVERAL WAYS TO DEVELOP
MICROSERVICESMICROSERVICES
Dropwizard
Lagom
Vert.x
Spring Boot
MicroProﬁle
4 . 3

WHAT IS MICROPROFILE?WHAT IS MICROPROFILE?
Comes from Java EE (Jakarta EE)
JAX‐RS + CDI + JSON‐P
Extensions
Conﬁgura on
Security
Health Check
Fault tolerance
Metrics
4 . 4

NUMBER APINUMBER API
JAX‐RS Endpoint
Generates random numbers
Just an HTTP GET on:
/numbers/book
Port 8084
Exposes a Swagger contract
4 . 5

NUMBER APINUMBER API
@Path("numbers")
@Produces(MediaType.TEXT_PLAIN)
public class NumberResource {
@GET
@Path("book")
public Response generateBookNumber() {
log.info("Generating a book number");
return Response.ok("BK-" + Math.random()).build();
}
}
4 . 6

RUNNING ON WILDFLY SWARMRUNNING ON WILDFLY SWARM
Comes from Wildﬂy (RedHat)
Open source
Modular
Small frac ons
Executable Jar
Now known as Thorntail
4 . 7

ANGULAR APPANGULAR APP
Angular
Bootstrap
(because we are bad web designers)
Port 8080
Invokes the number-api through HTTP
Thanks to the Open API contract
4 . 8

OPEN APIOPEN API
Open API Speciﬁca on
API documenta on
What do you call?
What are the parameters?
What are the status code?
Contract wri en in JSon (or Yaml)
Swagger is one implementa on
4 . 10

SWAGGER ANNOTATIONSSWAGGER ANNOTATIONS
@Path("numbers")
@Produces(MediaType.TEXT_PLAIN)
@Api(value = "numbers", description = "Generating all sorts of num
public class NumberResource {
@GET
@Path("book")
@ApiOperation(value = "Generates a book number.", response =
public Response generateBookNumber() {
log.info("Generating a book number");
}
}
4 . 11

SWAGGER CONTRACTSWAGGER CONTRACT
{
"swagger" : "2.0",
"info" : {
"description" : "Generates all sorts of numbers",
"version" : "01",
"title" : "Numbers API"
},
"host" : "localhost:8084",
"basePath" : "/number-api/api",
"tags" : [ {
"name" : "numbers",
"description" : "Generating all sorts of numbers."
} ],
"schemes" : [ "http", "https" ],
"paths" : {
"/numbers/book" : {
4 . 12

SWAGGER ECOSYSTEMSWAGGER ECOSYSTEM
4 . 13

SWAGGER CODE GENSWAGGER CODE GEN
Generates code from a Swagger contract
Client stubs
Several languages
Including TypeScript for Angular
$ swagger-codegen generate -i
swagger.json -l typescript-angular2 -o
src/app/shared
4 . 14

THE GENERATED TYPESCRIPT SERVICETHE GENERATED TYPESCRIPT SERVICE
@Injectable()
export class NumbersApi {
protected basePath = 'http://localhost:8084/number-api/api';
public generateBookNumber(extraHttpRequestParams?: any): Obse
return this.generateBookNumberWithHttpInfo(extraHttpReque
.map((response: Response) => {
if (response.status === 204) {
return undefined;
} else {
return response.text() || "";
}
});
}
4 . 15

CORSCORS
Cross‐Origin Resource Sharing
Speciﬁca on ( )
Access across domain‐boundaries
Number API and Angular app on diﬀerent machines
h ps://www.w3.org/TR/cors/
4 . 16

SOLVING CORSSOLVING CORS
Network conﬁgura on
JAX‐RS ContainerResponseFilter
Servlet Filter
4 . 17

CORS SERVLET FILTERCORS SERVLET FILTER
@WebFilter(filterName = "corsFilter")
public class CORSFilter implements Filter {
public void doFilter(ServletRequest request, ServletResponse
HttpServletResponse resp = (HttpServletResponse) response
resp.addHeader("Access-Control-Allow-Origin", "*");
resp.addHeader("Access-Control-Allow-Headers", "origin, c
resp.addHeader("Access-Control-Allow-Credentials", "true"
resp.addHeader("Access-Control-Allow-Methods", "GET, POST
resp.addHeader("Access-Control-Max-Age", "1209600");
resp.addHeader("Access-Control-Expose-Headers", "origin,
chain.doFilter(request, response);
}
}
4 . 18

CORS SERVLET FILTERCORS SERVLET FILTER
<filter>
<filter-name>CorsFilter</filter-name>
<filter-class>org.bakingpie.commons.web.CORSFilter</filter-cl
</filter>
<filter-mapping>
<filter-name>CorsFilter</filter-name>
<url-pattern>*</url-pattern>
</filter-mapping>
4 . 19

DEMO (LOCAL)DEMO (LOCAL)
4 . 20

DEPLOYDEPLOY
We have a bunch of Raspberry PIs
Running HypriotOS
We package everything with Docker
Use a Local Docker registry
Push Docker images to the PIs with Ansible
We could have used Docker Swarm too.
4 . 21

RASPBERRYRASPBERRY
Raspberry v3
Use HypriotOS
Minimal Debian‐based opera ng systems
Op mized to run Docker on Raspberry PIs
4 . 22

DOCKERDOCKER
Everything is packaged with Docker
Number API
Angular app
Using Maven Fabric8 Plugin
4 . 23

DOCKER REGISTRYDOCKER REGISTRY
We don’t use Docker Hub
Too slow
Use a Local Docker Registry
Speed up deployment
Running on port 5000
4 . 24

BUILDING DOCKER IMAGES WITH MAVENBUILDING DOCKER IMAGES WITH MAVEN
$ mvn clean install docker:build docker:push
4 . 25

DOCKER REGISTRYDOCKER REGISTRY
h p://docker‐registry:5000/v2/_catalog
4 . 26

ANSIBLEANSIBLE
Automate tasks
Ping all PIs
Deploy docker images on all PIs
Playbook
List of tasks to do
4 . 27

PLAYBOOK FOR OUR SERVICEPLAYBOOK FOR OUR SERVICE
---
- hosts: services
strategy: free
gather_facts: no
remote_user: pirate
become: yes
become_method: sudo
tasks:
- name: Deploy Number API
docker_container:
name: number-api
image: docker-registry:5000/baking/number-api:rpi
state: started
restart: yes
pull: true
4 . 28

PINGING ALL THE PISPINGING ALL THE PIS
$ ansible -i ansible/hosts -m ping all
4 . 29

DEPLOYING ON THE PISDEPLOYING ON THE PIS
$ ansible-playbook ansible/deploy.yaml -i ansible/hosts
4 . 30

WHAT’S NEXT ?WHAT’S NEXT ?
Adding more Microservices
Communica ng together
4 . 32

INVOKING MICRO-SERVICESINVOKING MICRO-SERVICES
We have one Number API Microservice
We need one Book API Microservice
Book API invokes Number API
We have one Angular client
We use 3 PIs
How do we deploy and make this run?
5 . 1

5 . 2

INVOKE MICROSERVICESINVOKE MICROSERVICES
Microservices need to talk to each other
Synchronously / Asynchronously
REST / Messaging / Reac ve
We’ll use only HTTP
5 . 3

SEVERAL TO CHOOSE FROMSEVERAL TO CHOOSE FROM
By hand
Apache HTTP Client
JAX‐RS Client API
Ne lix Feign
5 . 4

WHAT IS FEIGN?WHAT IS FEIGN?
Feign is a Java to HTTP client
Inspired by Retroﬁt, JAXRS‐2.0, and WebSocket
Reducing the complexity of HTTP APIs calls
Jersey or CXF
Clients for REST or SOAP services
5 . 5

BOOK APIBOOK API
JAX‐RS Endpoint
CRUD opera ons on Book
Book JPA en ty
HTTP GET/POST/PUT/DELETE on:
/books
Port 8081
5 . 6

BOOK APIBOOK API
@Path("books")
@Api(value = "books", description = "Operations for Books.")
public class BookResource {
@Inject
private NumbersApi numbersApi;
@Inject
private BookRepository bookRepository;
@GET
@Path("/{id : d+}")
public Response findById(@PathParam("id") final Long id) {
log.info("Getting the book " + id);
return ofNullable(bookRepository.findById(id))
map(Response::ok)
5 . 7

RUNNING ON TOMEERUNNING ON TOMEE
TomEE = Tomcat + Java EE
Comes from Apache
Open source
Supported by Tomitribe
Executable Fat‐Jar
5 . 8

NUMBER API SWAGGER CONTRACTNUMBER API SWAGGER CONTRACT
{
"swagger" : "2.0",
"info" : {
"description" : "Generates all sorts of numbers",
"version" : "02",
"title" : "Numbers API"
},
"host" : "localhost:8084",
"basePath" : "/number-api/api",
"tags" : [ {
"name" : "numbers",
"description" : "Generating all sorts of numbers."
} ],
"schemes" : [ "http", "https" ],
"paths" : {
"/numbers/book" : {
5 . 9

SWAGGER CODE GEN FEIGN CLIENT STUBSWAGGER CODE GEN FEIGN CLIENT STUB
$ swagger-codegen generate -i swagger.json -l java --library feig
5 . 10

THE GENERATED JAVA INTERFACETHE GENERATED JAVA INTERFACE
@Generated(value = "io.swagger.codegen.languages.JavaClientCodege
public interface NumbersApi extends ApiClient.Api {
@RequestLine("GET /numbers/book")
@Headers({"Content-Type: text/plain", "Accept: text/plain"})
String generateBookNumber();
}
5 . 11

THE GENERATED JAVA FEIGN CLIENTTHE GENERATED JAVA FEIGN CLIENT
public class ApiClient {
private String basePath = "http://localhost:8084/number-api/ap
public NumbersApi buildNumberApiClient() {
return Feign.builder()
.logger(new Slf4jLogger(NumbersApi.class))
.logLevel(Logger.Level.FULL)
.target(NumbersApi.class, basePath);
}
}
5 . 12

PRODUCING THE FEIGN CLIENTPRODUCING THE FEIGN CLIENT
@ApplicationScoped
public class NumbersApiProducer {
@Produces
@RequestScoped
public NumbersApi createNumbersApi() {
return new ApiClient().buildNumberApiClient();
}
}
5 . 13

INVOKING THE NUMBER API WITH FEIGNINVOKING THE NUMBER API WITH FEIGN
CLIENTCLIENT
@Path("books")
@Api(value = "books", description = "Operations for Books.")
public class BookResource {
@Inject
private NumbersApi numbersApi;
public Response create(@ApiParam(value = "Book to be created"
String isbn = numbersApi.generateBookNumber();
book.setIsbn(isbn);
5 . 14

DEMO (LOCAL)DEMO (LOCAL)
5 . 15

Monitoring our architecture
Figure out what’s wrong
5 . 17

MONITORINGMONITORING
We have several Microservices
Running on several PIs
Something goes wrong
How do we monitor them?
6 . 1

CENTRAL MONITORINGCENTRAL MONITORING
Centralize logs
Easier to vizualize
Several nodes logging to a single place
Allows to quickly see failures
6 . 3

Home made log aggrega on
Syslog
Fluentd
Splunk
Flume
Logma c.io
ELK
6 . 4

LOGSTASHLOGSTASH
Centralize, Transform & Stash Your Data
Data processing pipeline
Ingests data from a mul tude of sources
From Wildﬂy Swarm and TomEE logs
Push to Elas csearch
6 . 5

ELASTICSEARCHELASTICSEARCH
Search and analy cs engine
Centrally stores the data
From Logstash or other sources
So you can search out logs
Or any other informa on
6 . 6

KIBANAKIBANA
Lets you visualize Elas csearch data
Shape your data
Interac ve visualiza ons
6 . 7

GELFGELF
Graylog Extended Log Format
Log format avoids classic plain syslog
Docker log driver
6 . 8

LOGSTASH.CONFLOGSTASH.CONF
input {
gelf {
}
}
filter {
multiline {
pattern => '^s'
what => 'previous'
stream_identity => "%{host}.%{container_id}"
}
}
output {
elasticsearch {
6 . 9

GELF ON DOCKER-COMPOSEGELF ON DOCKER-COMPOSE
version: '2'
services:
angular-app:
image: baking/angular:default
container_name: angular
ports:
- 8080:80
depends_on:
- book-api
- number-api
book-api:
image: baking/book-api:default
container_name: book-api
ports:
- 8081:8081
logging:
6 . 10

Fixing IP addresses
Adding conﬁgura on
6 . 12

CONFIGURINGCONFIGURING
Book API has hard coded Number API address
We have several environments (local, docker‐
compose, PIs)
We need to conﬁgure the correct Hosts
7 . 1

CODE CONFIGURATIONCODE CONFIGURATION
Configure parts of the applica on
Business configura on
VAT rate
Currency
Technical configura on
Different environment
IP addresses / port numbers
Timeout
7 . 3

Environment variable
Property files
XML, JSon, Yaml
Database
JNDI in Java EE
Spring Config
MicroProfile Configura on
7 . 4

MICROPROFILE CONFIGURATIONMICROPROFILE CONFIGURATION
Conﬁg loca ons are called ConfigSources
Same property deﬁned in mul ple ConfigSources
Some data sources may change dynamically
Without the need to restart the applica on
7 . 5

BOOK API INVOKING NUMBER APIBOOK API INVOKING NUMBER API
public class ApiClient {
public interface Api {
}
private String baseHost = "http://localhost:8084";
private String basePath = "/number-api/api";
final Config config = ConfigProvider.getConfig();
config.getOptionalValue("NUMBER_API_HOST", String.class)
.ifPresent(host -> baseHost = host);
target(NumbersApi class baseHost + basePath);
7 . 6

DOCKER-COMPOSE ENV VARIABLEDOCKER-COMPOSE ENV VARIABLE
- name: Deploy Book API
docker_container:
name: book-api
image: docker-registry:5000/baking/book-api:rpi
state: started
restart: yes
pull: true
ports:
- "8081:8081"
env:
NUMBER_API_HOST: http://pi-grom-server-01:8084
7 . 7

Moving our services around
Adding a Registry
7 . 9

REGISTRINGREGISTRING
We have two Microservices
Book API and Number API
Can be deployed on any PI
How do they look for each other?
8 . 1

SERVICE REGISTRATION AND DISCOVERYSERVICE REGISTRATION AND DISCOVERY
Think of it as DNS resolu on
A service registers with a name
Another service looks for it by name
Several instances of the same service
8 . 3

JNDI
Apache Zookeeper
Ne lix Eureka
HashiCorp Consul
8 . 4

WHAT IS CONSUL?WHAT IS CONSUL?
Solu on to connect and conﬁgure applica ons
Distributed, highly available, and data center aware
Dynamic Service Discovery
Run me Conﬁgura on
8 . 5

REGISTER WITH CONSULREGISTER WITH CONSUL
Consul consul = Consul.builder().withUrl(consulHost + ":" + consu
agentClient = consul.agentClient();
final ImmutableRegistration registration = ImmutableRegistration.b
.id("number-api")
.name(NUMBER_API_NAME)
.address(numberApiHost)
.port(numberApiPort)
.check(http(numberApiHost + ":" + numberApiPort + "/numb
.build();
agentClient.register(registration);
8 . 6

HEALTH CHECKHEALTH CHECK
@GET
@Path("health")
@ApiOperation(value = "Health of this REST endpoint", response =
public Response health() {
log.info("Alive and Kicking !!!");
return Response.ok().build();
}
8 . 7

DISCOVER WITH CONSULDISCOVER WITH CONSUL
final Consul consul = Consul.builder().withUrl(consulHost + ":" +
final HealthClient healthClient = consul.healthClient();
final List<ServiceHealth> nodes = healthClient.getHealthyServiceI
final Service service = nodes.iterator().next().getService();
final String baseHost = service.getAddress() + ":" + service.getP
.target(NumbersApi.class, baseHost + basePath);
8 . 8

Handling failures
Adding a Circuit Breaker
8 . 11

CIRCUIT BREAKERCIRCUIT BREAKER
We have two Microservices
Book API calls Number API
But Number API can fail
How does Book API handle this failure?
10 . 1

Services some mes collaborate when handling
requests
When invoked synchronously, there is always the
possibility of being unavailable
(or high latency)
The failure of one service can poten ally cascade to
others
Client should invoke a remote service via a proxy
If consecu ve failures, the circuit breaks
10 . 3

Build your own (CDI)
JRugged
MicroProﬁle Fault‐Tolerance
Ne lix Hystrix
10 . 4

WHAT IS HYSTRIX?WHAT IS HYSTRIX?

Ne lix implementa on of Circuit Breaker
Construct a HystrixCommand represents the
request you are making
Execute the HystrixCommand
Is the Circuit Open?
Yes: Hystrix will not execute the command and
fallsback
No: proceeds
Integrates with Feign using Feign Hystrix
10 . 5

NUMBER API FAILINGNUMBER API FAILING
@GET
@Path("book")
@ApiOperation(value = "Generates a book number.", response = Stri
public Response generateBookNumber() throws InterruptedException
final Config config = ConfigProvider.getConfig();
config.getOptionalValue("NUMBER_API_FAKE_TIMEOUT", Integer.cl
log.info("Waiting for " + numberApiFakeTimeout + " seconds");
TimeUnit.SECONDS.sleep(numberApiFakeTimeout);
}
10 . 6

BOOK API FALLING BACKBOOK API FALLING BACK
// Get host from Consul
// This instance will be invoked if there are errors of any k
NumbersApi fallback = () -> {
return "FALLBACK ISBN";
};
return HystrixFeign.builder()
.target(NumbersApi.class, baseHost + basePath, fallba
}
10 . 7

Scaling the architecture
Adding a Load Balancer
10 . 9

SCALINGSCALING
We need to scale our Microservices
Several Number API’s
All registered in Consul
Deployed on several PIs
Which instance to choose from?
11 . 1

11 . 2

CLIENT-SIDE LOAD BALANCINGCLIENT-SIDE LOAD BALANCING
Several instances of same service registered
The client gets all the registered instances
Then choose from among these instances
Following certain criterias
Capacity, round‐robin, cloud‐provider availability‐
zone awareness, mul ‐tenancy
11 . 3

Amazon Elas c Load Balancing (ELB)
Apache H pd
Nginx
Ne lix Ribbon
11 . 4

WHAT IS RIBBON?WHAT IS RIBBON?
Ne lix implementa on of Client‐Side Load
Balancing
Fault tolerant
Mul ple protocols (HTTP, TCP, UDP) support
Synchronous, asynchronous and reac ve model
Caching and batching
Integrates with Feign using Feing Ribbon
11 . 5

REGISTER SEVERAL NUMBER APIS INREGISTER SEVERAL NUMBER APIS IN
CONSULCONSUL
final ImmutableRegistration registration =
ImmutableRegistration.builder()
.id(UUID.randomUUID().toString())
.name(NUMBER_API_NAME)
.address(numberApiHost)
.port(numberApiPort)
.check(http(numberApiHost + ":" + numberA
.build();
agentClient.register(registration);
11 . 6

BOOK API REGISTERS THE RIBBON LOAD-BOOK API REGISTERS THE RIBBON LOAD-
BALANCERBALANCER
private void registerLoadBalancer(final Consul consul) {
try {
final DefaultClientConfigImpl clientConfig = getClientCon
clientConfig.set(NFLoadBalancerClassName, "com.netflix.lo
clientConfig.set(NFLoadBalancerRuleClassName, "com.netflix
clientConfig.set(ServerListRefreshInterval, 10000);
final DynamicServerListLoadBalancer dynamicServerListLoad
(DynamicServerListLoadBalancer) registerNamedLoad
dynamicServerListLoadBalancer.setServerListImpl(new Numbe
dynamicServerListLoadBalancer.enableAndInitLearnNewServer
} catch (final ClientException e) {
e.printStackTrace();
}
}
11 . 7

BOOK API GETS THE REGISTEREDBOOK API GETS THE REGISTERED
INSTANCESINSTANCES
final HealthClient healthClient = consul.healthClient();
final List<ServiceHealth> nodes =
healthClient.getHealthyServiceInstances("CONSUL_NUMBER_API").
final List<Server> servers = nodes.stream()
.map(serviceHealth -> new Serve
URI.create(serviceHealth.ge
serviceHealth.getService().
.collect(toList());
11 . 8

BOOK API LOAD-BALANCES WITH FEIGNBOOK API LOAD-BALANCES WITH FEIGN
return HystrixFeign.builder()
.logger(new Logger.JavaLogger())
.target(LoadBalancingTarget.create(NumbersApi.class, "http://
11 . 9

Securing Microservices
Adding a Security Token
11 . 11

SECURITYSECURITY
Number API is a public API
Book API HTTP GETs are public
Book API HTTP POST / PUT / DELETE need
authen ca on
We need to centralize HTTP requests
Filter the ones that need auth
12 . 1

GATEWAYGATEWAY
Centralize requests
Think of it as a Proxy
Expose the service endpoint in the Proxy
Call the service through the Proxy
Intercepts the request
Apply Authen ca on and Authoriza on
12 . 3

Amazon API Gateway
Apigee Gateway
Tribestream Access Gateway
12 . 4

WHAT IS TRIBESTREAM ACCESS GATEWAY?WHAT IS TRIBESTREAM ACCESS GATEWAY?
API Security For Microservices
OAuth 2
JWT
H p Signatures
Route Microservices
Load Balancer
12 . 5

JSON WEB TOKENJSON WEB TOKEN
Lightweight token
Contains « some » data (claims)
Base64
Can be Encrypted
Passed in the HTTP Header
Sent at each request
12 . 6

ASKING FOR A TOKENASKING FOR A TOKEN
@Injectable()
export class AuthService {
private _jwt: string;
login(login: string, password: string): Observable<any> {
var headers: Headers = new Headers();
headers.append('Content-Type', 'application/x-www-form-urlenc
var body = `username=${login}&password=${password}`;
return this.http
.post(this.basePath, body, requestOptions)
.map((response: Response) => {
if (response.status !== 200) {
return undefined;
12 . 10

PASSING THE TOKEN AROUNDPASSING THE TOKEN AROUND
public _deleteWithHttpInfo(id: number, extraHttpRequestParams?: a
const path = this.basePath + '/books/${id}'.replace('${' + 'id
let queryParameters = new URLSearchParams();
var jwt = this.authService.jwt;
if (jwt != null) {
this.defaultHeaders.set('Authorization', jwt);
}
let requestOptions: RequestOptionsArgs = new RequestOptions({
method: RequestMethod.Delete,
headers: headers,
search: queryParameters,
withCredentials:this.configuration.withCredentials
});
return this http request(path requestOptions);
12 . 11

Stressing the architecture
Adding clients
12 . 13

HANDLING LOADHANDLING LOAD
We have microservices all over
They all depend on each other
We have several clients
We have several services
Things (can) go wrong
Things always go wrong !
13 . 1

Much more
But we don’t have me
13 . 3

RECAPRECAP
Let’s step back and do a recap
The architecture evolved thourgh demos
14 . 1

ONE ANGULAR APP INVOKES A REMOTEONE ANGULAR APP INVOKES A REMOTE
SERVICESERVICE
14 . 2

ONE SERVICE NEEDS TO TALK TO ANOTHERONE SERVICE NEEDS TO TALK TO ANOTHER
ONEONE
14 . 3

WE DON’T SEE ANYTHING SO WE ADDWE DON’T SEE ANYTHING SO WE ADD
MONITORINGMONITORING

WE NEED TO CONFIGURE DIFFERENTWE NEED TO CONFIGURE DIFFERENT
ENVIRONMENTSENVIRONMENTS

TO AVOID HARD CODED IP ADDRESSES, WETO AVOID HARD CODED IP ADDRESSES, WE
INTRODUCE A REGISTRYINTRODUCE A REGISTRY

TO AVOID FAILURE, WE INTRODUCE ATO AVOID FAILURE, WE INTRODUCE A

TO SCALE WE ADD MORE INSTANCES ANDTO SCALE WE ADD MORE INSTANCES AND
NEED A CLIENT LOAD-BALANCERNEED A CLIENT LOAD-BALANCER

WE NEED SECURITYWE NEED SECURITY

WE NEED TO HANDLE LOADWE NEED TO HANDLE LOAD
14 . 10

WE USED MANY MICRO-SERVICE DESIGNWE USED MANY MICRO-SERVICE DESIGN
PATTERNSPATTERNS
14 . 11

BUT THERE ARE MOREBUT THERE ARE MORE

LESSONS LEARNTLESSONS LEARNT
Micro Services are hard
Micro Services are bloody hard
Need to integrate with a lot of infrastucture
Run in diﬀerent environments (local, docker, pi)
The more technologies the harder
The more languages the harder
The more versions the harder
15 . 2

AND…AND…
We didn’t have databases
We didn’t have a complex business logic
We didn’t have a complex network
We didn’t duplicate and load balance the registry
We didn’t use asynchronous events
We didn’t do integra on tes ng
We didn’t do tracing (Zipkin)
We didn’t do rate limit on our APIs
15 . 3

WHAT DO THE OTHERS THINK?WHAT DO THE OTHERS THINK?
15 . 4

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15 . 9

ADVANTAGESADVANTAGES
Deliver new features quicker
Smaller, more agile teams
Deliver business features as services
Scale services independently
Address unpredictable loads
Cloud
15 . 10

BUT REMEMBERBUT REMEMBER
Use this type of architecture
If you need it
Because it brings you advantages
Not because the others are doing it
15 . 11

THANKS FOR THE PIS !THANKS FOR THE PIS !
15 . 13

VOXXED DAYS MICROSERVICESVOXXED DAYS MICROSERVICES
15 . 14

KEEPING IN TOUCHKEEPING IN TOUCH
Antonio Goncalves
Roberto Cortez
@agoncal
@radcortez
h ps://github.com/agoncal/baking‐microservice‐pie
15 . 16

Baking a Microservice PI(e)

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