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RPC - An RPC (Remote Procedure Call) framework in general is a set of tools that enable the programmer to call a piece of code in a remote process, be it on a different machine or just another process on the same machine.
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Developed at Google. Now part of CNCF.
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gRPC is a modern open source high performance RPC framework that can run in any environment. It can efficiently connect services in and across data centers with pluggable support for load balancing, tracing, health checking, and authentication. It’s backed in HTTP/2, cross platform, and open source. It’s also compact in regards to its size.
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Leverages HTTP2 and protocol buffers.
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VSCode Plugin - https://marketplace.visualstudio.com/items?itemName=zxh404.vscode-proto3
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Example - https://adityasridhar.com/posts/how-to-effectively-use-grpc-streams-in-nodejs
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Client Examples - https://github.com/improbable-eng/grpc-web/tree/master/client
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grpc_tools_node_protoc_ts - https://www.npmjs.com/package/grpc_tools_node_protoc_ts#example
- Four RPC types
- Metadata
- Authentication
- Deadlines and Cancellation
- Compression
- Load Balancing
- Automatically generated boilerplate
- Protocol Buffers is a method of serializing structured data.
- Google Protobuf - https://developers.google.com/protocol-buffers/docs/reference/google.protobuf
syntax = "proto3"
// Define message types
message EchoMessage = {
string value = 1;
}
// Define Service and RPCs
service EchoService {
rpc EchoUnary (EchoMessage) returns (EchoMessage);
rpc EchoClientStream (stream EchoMessage) returns (EchoMessage);
rpc EchoServerStream (EchoMessage) returns (stream EchoMessage);
rpc EchoBidiStream (stream EchoMessage) returns (stream EchoMessage); // BiDirectional
}
- Two primary environments: Browser and Node.js
- Browser has limitations regarding gRPC a. Might not support HTTP2 at all b. Lacks API for line-grained control over HTTP2
- Node.js is a typical backend environment
npm install --save grpc
npm install @grpc/grpc-js // Beta
1. yarn init -y
2. yarn add grpc uuid
3. yarn add @grpc/proto-loader
1. yarn server
2. yarn client
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