GAPIC Showcase

GAPIC Showcase is an API that demonstrates Generated API Client (GAPIC) features and common API patterns used by Google. It follows the Cloud APIs design guide. This project provides a server and client implementation of the API that can be run locally over both gRPC and HTTP/JSON.

Installation

The GAPIC Showcase CLI can be installed using three different mechanisms: pulling a docker image from Google Container Registry, downloading the compiled binary from our our releases page, or simply by installing from source using go.

Docker

$ docker pull gcr.io/gapic-images/gapic-showcase:latest
$ docker run \
    --rm \
    -p 7469:7469/tcp \
    -p 7469:7469/udp \
    gcr.io/gapic-images/gapic-showcase:latest \
    --help
> Root command of gapic-showcase
>
> Usage:
>   gapic-showcase [command]
>
> Available Commands:
>   completion  Emits bash a completion for gapic-showcase
>   echo        This service is used showcase the four main types...
>   help        Help about any command
>   identity    A simple identity service.
>   messaging   A simple messaging service that implements chat...
>   run         Runs the showcase server
>   testing     A service to facilitate running discrete sets of...
>
> Flags:
>   -h, --help      help for gapic-showcase
>   -j, --json      Print JSON output
>   -v, --verbose   Print verbose output
>       --version   version for gapic-showcase
>
> Use "gapic-showcase [command] --help" for more information about a command.

Binary

$ export GAPIC_SHOWCASE_VERSION=0.24.0
$ export OS=linux
$ export ARCH=amd64
$ curl -L https://github.com/googleapis/gapic-showcase/releases/download/v${GAPIC_SHOWCASE_VERSION}/gapic-showcase-${GAPIC_SHOWCASE_VERSION}-${OS}-${ARCH}.tar.gz | sudo tar -zx --directory /usr/local/bin/
$ gapic-showcase --help
...

Source

$ go install github.com/googleapis/gapic-showcase/cmd/gapic-showcase@latest
$ PATH=$PATH:`go env GOPATH`/bin
$ gapic-showcase --help
...

* Bear in mind this is not a versioned installation so no versioning guarantees hold using this installation method.

Schema

The schema of GAPIC Showcase API can be found in schema/google/showcase/v1beta1 Its dependencies can be found in the googleapis/googleapis submodule.

Development Environment

To set up this repository for local development, follow these steps:

1. Install protoc from the protobuf release page or your OS package manager. This API utilizes proto3_optional, thus v3.12.0 is the minimum supported version of protoc.

2. Initialize the googleapis submodule:

   git submodule update --init --recursive

3. Install Go

   1. Linux: sudo apt-get install golang
   2. Mac, Windows, or other options: Please see the official set-up docs.

4. Clone this repository.

5. Set up Go protobuf tools:

   go install github.com/golang/protobuf/protoc-gen-go@latest
   go install github.com/googleapis/gapic-generator-go/cmd/protoc-gen-go_cli@latest
   go install github.com/googleapis/gapic-generator-go/cmd/protoc-gen-go_gapic@latest

6. Export the Go binaries to your environment path.

   PATH=$PATH:`go env GOPATH`/bin

7. To compile the Showcase binary, as well as associated development utilities in this repository, run the following after you make changes:

   go install ./...

Making changes to the protos

If there are any changes to the protobuf files, the generated support code must be regenerated. This can be done by executing the following command:

go install ./util/cmd/... && go run ./util/cmd/compile_protos

If successful, you may see changes in the following directories:

• server/genproto
• server/genrest
• client/
• cmd/gapic-showcase

Then, update the binaries:

go install ./...

Quick Start

This quick start guide will show you how to start the server and make a request to it.

Step 1. Run the server

Run the showcase server to allow requests to be sent to it. This opens port :7469 to send and receive requests.

$ gapic-showcase run
> 2018/09/19 02:13:09 Showcase listening on port: :7469

Step 2. Make a request

Open a new terminal window and make a request to the server.

$ gapic-showcase \
  identity \ # Service name
  create-user \ # Message name
  --user.display_name Rumble \ # Request fields
  --user.email rumble@goodboi.com
> name:"users/0" display_name:"Rumble" email:"rumble@goodboi.com" create_time:<seconds:1554414332 nanos:494679000 > update_time:<seconds:1554414332 nanos:494679000 >

Note: You can make requests to this server from your own client but an insecure channel must be used since the server does not implement auth. Client library generators with Showcase-based integration tests need to provide the insecure channel to the client library in the tests.

Example for Node.js:

const grpc = require('@grpc/grpc-js');
const showcase = require('showcase');
const client = new showcase.EchoClient({ grpc, sslCreds: grpc.credentials.createInsecure() });

Example for Go:

conn, err := grpc.Dial("localhost:7469", grpc.WithInsecure())
if err != nil {
    log.Fatal(err)
}
opt := option.WithGRPCConn(conn)
client, err = showcase.NewEchoClient(context.Background(), opt)
if err != nil {
    log.Fatal(err)
}

Example for Java (gRPC):

EchoSettings echoSettings = EchoSettings.newBuilder()
    .setCredentialsProvider(NoCredentialsProvider.create())
    .setTransportChannelProvider(
        InstantiatingGrpcChannelProvider.newBuilder()
            .setChannelConfigurator(
                new ApiFunction<ManagedChannelBuilder, ManagedChannelBuilder>() {
                  @Override
                  public ManagedChannelBuilder apply(ManagedChannelBuilder input) {
                    return input.usePlaintext();
                  }
                })
            .build())
    .build();
EchoClient echoClient = EchoClient.create(echoSettings);

Example for Java (httpJson):

EchoSettings echoSettings = EchoSettings.newHttpJsonBuilder()
    .setTransportChannelProvider(EchoSettings.defaultHttpJsonTransportProviderBuilder()
        .setHttpTransport(new NetHttpTransport.Builder().doNotValidateCertificate().build())
        .setEndpoint("http://localhost:7469")
        .build())
    .build();
EchoClient echoClient = EchoClient.create(echoSettings);

Example for Python

from google import showcase_v1beta1
from google.auth import credentials

import grpc

# ...

if do_grpc:
    transport_cls = showcase_v1beta1.EchoClient.get_transport_class("grpc")
    transport = transport_cls(
        credentials=credentials.AnonymousCredentials(),
        channel=grpc.insecure_channel("localhost:7469"),
        host="localhost:7469",
    )
else:
    transport_cls = showcase_v1beta1.EchoClient.get_transport_class("rest")
    transport = transport_cls(
        credentials=credentials.AnonymousCredentials(),
        host="localhost:7469",
        url_scheme="http",
    )

Released Artifacts

GAPIC Showcase releases three main artifacts, a CLI tool, the gapic-showcase service protobuf files staged alongside its dependencies, and a protocol buffer descriptor set compiled from the gapic-showcase service protos.

Check out our releases page to see our released artifacts.

Versioning

GAPIC Showcase follows semantic versioning. All artifacts that are released for a certain version are guaranteed to be compatible with one another.

Releases

Releases are made by release-please based on the contents of the Conventional Commits made to the project. Assets are then uploaded to the releases that are created.

Supported Go Versions

GAPIC Showcase is supported for go versions 1.16 and later.

FAQ

Is this Showcase API publicly served?

This API is not publicly served.

Disclaimer

This is not an official Google product.