gRPC Stream File Transfer Example

Simple example for file transfer using gRPC Stream.

• Server: Go
• Client: Dart

Dependencies:

1. Go >= 1.5 - For install instructions Click Here

2. Dart >= 2.2.2 <= 3.0.0 - For install instructions Click Here

3. protoc (Protobuf Compiler) - For install instructions Click Here

4. protoc-gen-go plugin

export GO111MODULE=on
go get github.com/golang/protobuf/protoc-gen-go

5. protoc-gen-go-grpc plugin

export GO111MODULE=on
go get google.golang.org/grpc/cmd/protoc-gen-go-grpc

6. protoc-gen-dart plugin

pub global activate protoc_plugin

Generating Protos

The last protos for this example already have been genereted and commited, but if you need to regenerate the protos use the instructions below:

Using vscode-proto3:

By default ⇧ + CTRL + P(Linux/Windows) ou ⇧ + ⌘ + P(Mac) opens the command prompt. Type one of these commands:

Command	Description
proto3: Compile All Protos	Compiles all workspace protos using configurations defined with protoc.options.
proto3: Compile This Proto	Compiles the active proto using configurations defined with protoc.options.

This project has include .vscode/settings with necessary configs for vscode-proto3, open this file and uncomment "--plugin" parameters with absolute path for protoc-gen-dart, protoc-gen-go, protoc-gen-go-grpc case default configs doesn't works properly and get error with unknown path for this plugins.

Using protoc CLI:

Open terminal and cd for project root:

cd PROJECT_ROOT
protoc  --plugin="protoc-gen-go=[absolute_path_to]/protoc-gen-go" \
        --plugin="protoc-gen-go-grpc=[absolute_path_to]/protoc-gen-go-grpc" \
        --plugin="protoc-gen-dart=[absolute_path_to]/protoc-gen-dart" \
        --proto_path=${PWD} \
        --dart_out="grpc:./client/lib/src" \
        --go_out="./server" \
        --go-grpc_out="./server" \
        proto/grpc_file_transfer.proto

Try

1. Run Server:

cd server/
go run main.go

2. Run Client:

cd client/
dart --packages=.dart_tool/package_config.json package:grpcfiletransfer/src/client.dart

Credits

Video Example by File Examples