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BEYOND HTTP IN ASP.NET
CORE 3.0 WITH gRPC
Steve Gordon
@stevejgordon | stevejgordon.co.uk
http://bit.ly/dotnet-grpc
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FULL DISCLOSURE
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STORY TIME
ARE YOU SITTING COMFORTABLY?
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@stevejgordon
www.stevejgordon.co.uk
HTTP 3rd Party API
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WHAT HAPPENED NEXT?...
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…BUZZWORDS
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@stevejgordon
www.stevejgordon.co.uk
3rd Party API
3rd Party API
3rd Party API
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WHAT IS WRONG
WITH REST?
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gRPC REMOTE PROCEDURE CALL
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@stevejgordon
www.stevejgordon.co.uk
• Contract based
• Supports code generation
• Multi-platform
C#, C++, Dart, Go, Java, Node, Objective-C, PHP, Python, Ruby
• HTTP/2
• Uses a binary, Protobuf payload
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@stevejgordon
www.stevejgordon.co.uk
2001
Google Stubby
March 2015
gRPC open
sourced
August 2016
gRPC v1.0.0
Sept 2019
gRPC .NET with
.NET Core 3.0
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@stevejgordon
www.stevejgordon.co.uk
Getting Started
Create a new project
Select 'gRPC Service'
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@stevejgordon
www.stevejgordon.co.uk
Project Structure
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*.PROTO
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@stevejgordon
www.stevejgordon.co.uk
syntax = "proto3";
option csharp_namespace = "HelloWorld";
package Greet;
service Greeter {
rpc SayHello (HelloRequest) returns (HelloReply) {}
}
message HelloRequest {
string name = 1;
}
message HelloReply {
string message = 1;
}
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@stevejgordon
www.stevejgordon.co.uk
syntax = "proto3";
option csharp_namespace = "HelloWorld";
package Greet;
service Greeter {
rpc SayHello (HelloRequest) returns (HelloReply) {}
}
message HelloRequest {
string name = 1;
}
message HelloReply {
string message = 1;
}
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@stevejgordon
www.stevejgordon.co.uk
syntax = "proto3";
option csharp_namespace = "HelloWorld";
package Greet;
service Greeter {
rpc SayHello (HelloRequest) returns (HelloReply) {}
}
message HelloRequest {
string name = 1;
}
message HelloReply {
string message = 1;
}
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@stevejgordon
www.stevejgordon.co.uk
syntax = "proto3";
option csharp_namespace = "HelloWorld";
package Greet;
service Greeter {
rpc SayHello (HelloRequest) returns (HelloReply) {}
}
message HelloRequest {
string name = 1;
}
message HelloReply {
string message = 1;
}
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@stevejgordon
www.stevejgordon.co.uk
syntax = "proto3";
option csharp_namespace = "HelloWorld";
package Greet;
service Greeter {
rpc SayHello (HelloRequest) returns (HelloReply) {}
}
message HelloRequest {
string name = 1;
}
message HelloReply {
string message = 1;
}
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GETTING STARTED DEMO
…
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gRPC & MICROSERVICES
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@stevejgordon
www.stevejgordon.co.uk
SERVICE B (NODE) SERVICE C (.NET)
SERVER
SERVICE A (.NET)
SERVER
CLIENT
SERVICE D (GO)
SERVER
CLIENT
CLIENT
PROTO A
PROTO A
PROTO B
PROTO B
PROTO C
PROTO C
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@stevejgordon
www.stevejgordon.co.uk
• Unary
Single request with a single response – A normal function call
• Server Streaming
Single request with a stream of responses for the client to consume
• Client Streaming
Client sends a stream of requests, each receiving a single response
• Bidirectional Streaming
Client sends a stream of requests and consumes a stream of responses
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STREAMING DEMOS
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PERFORMANCE
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REST Body
10,072 Bytes
GRPC Body
1,916 Bytes
RESULTS
80.98% SMALLER
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@stevejgordon
www.stevejgordon.co.uk
• No need for *.proto
• Apply attributes to .NET interfaces and classes
• Interface(s) define your services
• Classes define your message models
• Can also use a *.proto to generate the C# code
• Share contracts as libraries between .NET servers and clients
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CODE-FIRST gRPC DEMO
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THE BIG FINISH DEMO!
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@stevejgordon
www.stevejgordon.co.uk
ASP.NET Core
Service (.NET)
CLIENT
weather.proto
gRPC Weather
Service (.NET)
SERVER
weather.proto
HTTP
SignalR
HTTP gRPC
…
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@stevejgordon
www.stevejgordon.co.uk
• Performance
• Efficient binary serialisation (low CPU overhead) using Protobuf
• Smaller payloads
• HTTP/2 is fundamentally quicker
• Code-gen server and clients for many languages/frameworks
• Contract based
• Supports first class streaming
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@stevejgordon
www.stevejgordon.co.uk
• Code generation in .NET is C# only
• Kestrel doesn't support HTTP/2 with TLS on macOS
https://docs.microsoft.com/en-us/aspnet/core/grpc/aspnetcore?view=aspnetcore-3.0&tabs=visual-studio#grpc-and-aspnet-core-on-macos
• Harder to exercise without tools such as Postman
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@stevejgordon
www.stevejgordon.co.uk
• A great choice for microservice communication
• A good way to support server-to-server communication in
polyglot environments
• Easy to get started using the gRPC service template
• gRPC .NET libraries make creating servers and clients very easy
https://github.com/grpc/grpc-dotnet
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THANK YOU
@stevejgordon
www.stevejgordon.co.uk
https://app.pluralsight.com/profile/author/steve-gordon
http://bit.ly/dotnet-grpc