Introdução a gRPC: um framework moderno e performático para comunicação entre microsserviços

PaymentRequest request = new PaymentRequest()
;

request.setCardNumber("1234 5678 8765 4321");
request.setExpiryDate("03/2028");
request.setCvc("123")
;

request.setAmount(120.2)
;

request.setCurrency(Currency.BRL)
;

Result result = paymentService.processPayment(request)
;

if (result.isSuccess())
{

// processa fluxo do pedido...
}

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;

;

;

;

;

{

}

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;

;

;

;

;

{

}

;

;

;

;

;

{

}

;

;

;

;

;

{

}

;

;

;

;

;

{

}

Mas quando
trabalhamos com
sistemas distribuídos…

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Pagamento Online
SUCCESS

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Pagamento Online
SUCCESS

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Pagamento Online
SUCCESS

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Spring Boot App Spring Boot App

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Client
 
(Online Shop)

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Service

(Payment Service)
Client
 
(Online Shop)

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Internet
Client
 
(Online Shop)
Service

(Payment Service)

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Internet
Client
 
(Online Shop)
Service

(Payment Service)

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Internet
Remote Calls
Client
 
(Online Shop)
Service

(Payment Service)

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Internet
Remote Calls
Client
 
(Online Shop)
Service

(Payment Service)

;

;

;

;

;

{

}

;

;

;

;

;

{

}

framework
RPC

RPC Framework

RPC Framework
RPC client RPC server

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RPC Framework
processPayment() stub

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RPC Framework
waiting

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RPC Framework
{

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RPC Framework
{

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RPC Framework
processPayment(
)

implementation
{

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RPC Framework
processPayment(
)

implementation
{

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RPC Framework
processPayment(
)

implementation
{

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RPC Framework
processPayment(
)

implementation
{

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;

;

;

;

;

{

}

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;

;

;

;

;

{

}
Location
Transparency

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Mas na
prática…

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Internet
Remote Calls
Client
 
(Online Shop)
Service

(Payment Service)

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Client
 
(Online Shop)
Service

(Payment Service)
 
Internet
Remote Calls

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Spring Boot App
Client
 
(Online Shop)
Spring Boot App
Service

(Payment Service)
 
Internet
Remote Calls

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Spring Boot App
Client
 
(Online Shop)
Spring Boot App
Service

(Payment Service)
 
Internet
Remote Calls

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Spring Boot App
Client
 
(Online Shop)
Spring Boot App
Service

(Payment Service)
 
Internet
Remote Calls

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Spring Boot App
Client
 
(Online Shop)
Spring Boot App
Service

(Payment Service)
 
Internet
Remote Calls

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Spring Boot App
Client
 
(Online Shop)
Spring Boot App
Service

(Payment Service)
 
Internet
Remote Calls

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Internet
Client
 
(Online Shop)
Service

(Payment Service)
Remote Calls

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https://deniseyu.io/art/

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Falando em
frameworks…

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1990

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CORBA
1990

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CORBA
1990
DCOM
 
e Java RMI
199x

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CORBA
1990
DCOM
 
e Java RMI
SOAP
1998
199x

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CORBA
1990
DCOM
 
e Java RMI
SOAP
Thrift
2007
1998
199x

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CORBA
1990
DCOM
 
e Java RMI
SOAP
Thrift
gRPC
2015
2007
1998
199x

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https://tools.ietf.org/html/rfc707

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simple & idiomatic

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simple & idiomatic
performant & scalable

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simple & idiomatic
interoperable & extensible

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gRPC vs REST API with JSON
https://docs.microsoft.com/en-us/aspnet/core/grpc/comparison?view=aspnetcore-5.0

simple & idiomatic

IDL

IDL
HTTP/2

IDL
HTTP/2
Protobuf v3

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Public REST API

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API Gateway
Public REST API

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API Gateway
http http http http http
Public REST API

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API Gateway
Public REST API

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API Gateway
Public REST API
gRPC gRPC gRPC gRPC
gRPC
gRPC
gRPC
gRPC
gRPC gRPC

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API Gateway
Public REST API
gRPC gRPC gRPC gRPC
gRPC
gRPC
gRPC
gRPC
gRPC gRPC

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Performance

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3x increase in throughput
Performance

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3x increase in throughput 11x di
ff
erence per CPU
Performance
https://cloud.google.com/blog/products/gcp/announcing-grpc-alpha-for-google-cloud-pubsub

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Seu smartphone agradece!

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IDL

(Interface De
fi
nition Language)

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syntax = "proto3"
;

service PaymentService
{

rpc processPayment(PaymentRequest) returns (PaymentResponse) {
}

}

message PaymentRequest
{

enum Currency
{

BRL = 0
;

USD = 1
;

}

string cardNumber = 1
;

string expiryDate = 2
;

string cvc = 3
;

double amount = 4
;

Currency currency = 5
;

}

message PaymentResponse
{

bool success = 1
;

string txId = 2
;

}
paymentService.proto

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syntax = "proto3"
;

{

}

}

{

enum Currency
{

BRL = 0
;

USD = 1
;

}

;

;

string cvc = 3
;

double amount = 4
;

;

}

{

bool success = 1
;

string txId = 2
;

}

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syntax = "proto3"
;

{

}

}

{

enum Currency
{

BRL = 0
;

USD = 1
;

}

;

;

string cvc = 3
;

double amount = 4
;

;

}

{

bool success = 1
;

string txId = 2
;

}

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syntax = "proto3"
;

{

}

}

{

enum Currency
{

BRL = 0
;

USD = 1
;

}

;

;

string cvc = 3
;

double amount = 4
;

;

}

{

bool success = 1
;

string txId = 2
;

}

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syntax = "proto3"
;

{

}

}

{

enum Currency
{

BRL = 0
;

USD = 1
;

}

;

;

string cvc = 3
;

double amount = 4
;

;

}

{

bool success = 1
;

string txId = 2
;

}

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syntax = "proto3"
;

{

}

}

{

enum Currency
{

BRL = 0
;

USD = 1
;

}

;

;

string cvc = 3
;

double amount = 4
;

;

}

{

bool success = 1
;

string txId = 2
;

}

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syntax = "proto3"
;

{

}

}

{

enum Currency
{

BRL = 0
;

USD = 1
;

}

;

;

string cvc = 3
;

double amount = 4
;

;

}

{

bool success = 1
;

string txId = 2
;

}

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syntax = "proto3"
;

{

}

}

{

enum Currency
{

BRL = 0
;

USD = 1
;

}

;

;

string cvc = 3
;

double amount = 4
;

;

}

{

bool success = 1
;

string txId = 2
;

}

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syntax = "proto3"
;

{

}

}

{

enum Currency
{

BRL = 0
;

USD = 1
;

}

;

;

string cvc = 3
;

double amount = 4
;

;

}

{

bool success = 1
;

string txId = 2
;

}

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syntax = "proto3"
;

{

}

}

{

enum Currency
{

BRL = 0
;

USD = 1
;

}

;

;

string cvc = 3
;

double amount = 4
;

;

}

{

bool success = 1
;

string txId = 2
;

}

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syntax = "proto3"
;

{

}

}

{

enum Currency
{

BRL = 0
;

USD = 1
;

}

;

;

string cvc = 3
;

double amount = 4
;

;

}

{

bool success = 1
;

string txId = 2
;

}

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syntax = "proto3"
;

{

}

}

{

enum Currency
{

BRL = 0
;

USD = 1
;

}

;

;

string cvc = 3
;

double amount = 4
;

;

}

{

bool success = 1
;

string txId = 2
;

}

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syntax = "proto3"
;

{

}

}

{

enum Currency
{

BRL = 0
;

USD = 1
;

}

;

;

string cvc = 3
;

double amount = 4
;

;

}

{

bool success = 1
;

string txId = 2
;

}

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Compilando o arquivo .proto

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Channel channel = ManagedChannelBuilde
r

.forAddress("paymentservice.com", 50051
)

.build()
;

PaymentServiceBlockingStub paymentService = PaymentServiceGrpc.newBlockingStub(channel)
;

PaymentRequest request = newBuilder(
)

.setCardNumber("1234 5678 8765 4321"
)

.setExpiryDate("03/2028"
)

.setCvc("123"
)

.setAmount(120.2
)

.setCurrency(Currency.BRL
)

.build()
;

PaymentResponse result = paymentService.processPayment(request)
;

if (result.getSuccess())
{

// processa fluxo do pedido..
.

}

gRPC Client | Consumindo endpoint de pagamento

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r

)

.build()
;

;

)

.setCardNumber("1234 5678 8765 4321"
)

)

.setCvc("123"
)

.setAmount(120.2
)

)

.build()
;

;

{

.

}


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r

)

.build()
;

;

)

.setCardNumber("1234 5678 8765 4321"
)

)

.setCvc("123"
)

.setAmount(120.2
)

)

.build()
;

;

{

.

}


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r

)

.build()
;

;

)

.setCardNumber("1234 5678 8765 4321"
)

)

.setCvc("123"
)

.setAmount(120.2
)

)

.build()
;

;

{

.

}


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r

)

.build()
;

;

)

.setCardNumber("1234 5678 8765 4321"
)

)

.setCvc("123"
)

.setAmount(120.2
)

)

.build()
;

;

{

.

}


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r

)

.build()
;

;

)

.setCardNumber("1234 5678 8765 4321"
)

)

.setCvc("123"
)

.setAmount(120.2
)

)

.build()
;

;

{

.

}


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r

)

.build()
;

;

)

.setCardNumber("1234 5678 8765 4321"
)

)

.setCvc("123"
)

.setAmount(120.2
)

)

.build()
;

;

{

.

}


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No
fi
nal das
contas…

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Protobuf Work
fl
ow

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.proto
1 Define
Protobuf Work
fl
ow

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.proto protoc
1 Define 2 Compile
Protobuf Work
fl
ow

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.proto protoc
go
java
python
1 Define 2 Compile
Protobuf Work
fl
ow

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.proto protoc
go
java
python
1 Define 2 Compile
0101010 
1010101 
0101010 
3 Serialize
Protobuf Work
fl
ow

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gRPC Work
fl
ow

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.proto
1 Define
gRPC Work
fl
ow

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.proto protoc
1 Define 2 Compile
gRPC Work
fl
ow

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.proto protoc
go
java
python
1 Define 2 Compile
gRPC Work
fl
ow

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.proto protoc
go
java
python
1 Define 2 Compile
server
3 Implement
gRPC Work
fl
ow
client

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.proto protoc
go
java
python
1 Define 2 Compile
server
3 Implement
gRPC Work
fl
ow
client

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syntax = "proto3"
;

{

}

}

{

enum Currency
{

BRL = 0
;

USD = 1
;

}

;

;

string cvc = 3
;

double amount = 4
;

;

}

{

bool success = 1
;

string txId = 2
;

}

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syntax = "proto3"
;

{

}

}

{

enum Currency
{

BRL = 0
;

USD = 1
;

}

;

;

string cvc = 3
;

double amount = 4
;

;

}

{

bool success = 1
;

string txId = 2
;

}

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public class PaymentEndpoint extends PaymentServiceGrpc.PaymentServiceImplBase
{

@Override
public void processPayment(PaymentRequest request
,

StreamObserver responseObserver)
{

// lógica de negóci
o

Payment payment = toPayment(request); // converte para modelo de domíni
o

UUID transactionId = new PaymentService().process(payment)
;

// envia resposta para o clien
t

responseObserver.onNext(PaymentResponse.newBuilder(
)

.setTxId(transactionId.toString()
)

.setSuccess(true
)

.build())
;

responseObserver.onCompleted()
;

}
}
gRPC Server | Expondo endpoint de pagamento

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{

@Override
,

{

o

o

;

t

)

)

.setSuccess(true
)

.build())
;

;

}
}

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{

@Override
,

{

o

o

;

t

)

)

.setSuccess(true
)

.build())
;

;

}
}

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{

@Overrid
e

,

{

o

o

;

t

)

)

.setSuccess(true
)

.build())
;

;

}

}

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{

@Overrid
e

,

{

o

o

;

t

)

)

.setSuccess(true
)

.build())
;

;

}

}

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{

@Overrid
e

,

{

o

o

;

t

)

)

.setSuccess(true
)

.build())
;

;

}

}

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{

@Overrid
e

,

{

o

o

;

t

)

)

.setSuccess(true
)

.build())
;

;

}

}

View Slide

{

@Overrid
e

,

{

o

o

;

t

)

)

.setSuccess(true
)

.build())
;

;

}

}

View Slide

{

@Overrid
e

,

{

o

o

;

t

)

)

.setSuccess(true
)

.build())
;

;

}

}

View Slide

{

@Overrid
e

,

{

o

o

;

t

)

)

.setSuccess(true
)

.build())
;

;

}

}

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{

@Overrid
e

,

{

o

o

;

t

)

)

.setSuccess(true
)

.build())
;

;

}

}

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Padrões de
comunicação

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1 2
3 4

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server
client
Simple RPC (Unary RPC)
2
3 4

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server
client server
client
Simple RPC (Unary RPC) Server-side Streaming RPC
3 4

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server
client server
client
server
client
Client-side Streaming RPC
4

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server
client server
client
server
client server
client
Client-side Streaming RPC Bidirectional Streaming RPC

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syntax = "proto3";
{

}

rpc listenToTransactions(TransactionRequest) returns (stream TransactionResponse) {
}

rpc processPaymentInBatch(stream PaymentInBatchRequest) returns (PaymentInBatchResponse) {
}

rpc validateCreditCard(stream CreditCardRequest) returns (stream ValidateCCResponse) {
}

}

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syntax = "proto3";
{

}

}

}

}

}
Simple RPC (Unary RPC)

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syntax = "proto3";
{

}

}

}

}

}

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syntax = "proto3";
{

}

}

}

}

}
Server-side Streaming RPC

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syntax = "proto3";
{

rpc processPayment(PaymentRequest) returns (PaymentResponse) {}
rpc listenToTransactions(TransactionRequest) returns (stream TransactionResponse) {}
}

}

}

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syntax = "proto3";
{

}

}

}

}
Client-side Streaming RPC

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syntax = "proto3";
{

}

}

rpc processPaymentInBatch(stream PaymentInBatchRequest) returns (PaymentInBatchResponse) {}
}

}

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syntax = "proto3";
{

}

}

}

}
Bidirectional Streaming RPC

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syntax = "proto3";
{

}

}

}

rpc validateCreditCard(stream CreditCardRequest) returns (stream CreditCardResponse) {
}

}

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.proto protoc
go
java
python
1 Define 2 Compile
server
3 Implement
gRPC Work
fl
ow
client

Introdução a gRPC: um framework moderno e performático para comunicação entre microsserviços

Introdução a gRPC: um framework moderno e performático para comunicação entre microsserviços

Rafael Ponte

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