feat: add grpc example (#66)

projects/bzl7/.bazelrc

@@ -1,6 +1,8 @@
 build --incompatible_enable_cc_toolchain_resolution
 build --incompatible_strict_action_env
 
+build --host_cxxopt=-std=c++17
+
 build --host_platform=@rules_nixpkgs_core//platforms:host
 
 build:gcc10 --platforms=//platforms:gcc_10

projects/bzl7/BUILD.bazel

@@ -4,6 +4,7 @@ load("@gazelle//:def.bzl", "gazelle")
 gazelle(
     name = "gazelle",
     args = [
-        "go/gazelle"
+        "go/gazelle",
+        "go/grpc",
     ],
 )

projects/bzl7/MODULE.bazel

@@ -6,12 +6,15 @@ RULES_NIX_PKGS_VERSION = "0.11.1"
 
 bazel_dep(name = "aspect_rules_py", version = "0.7.1")
 bazel_dep(name = "gazelle", version = "0.36.0")
+bazel_dep(name = "grpc", version = "1.62.1")
 bazel_dep(name = "rules_cc", version = "0.0.9")
 bazel_dep(name = "rules_go", version = "0.46.0")
 bazel_dep(name = "rules_nixpkgs_cc")
 bazel_dep(name = "rules_nixpkgs_core", version = RULES_NIX_PKGS_VERSION)
+bazel_dep(name = "rules_proto", version = "6.0.0-rc3")
 bazel_dep(name = "rules_python", version = "0.31.0")
 bazel_dep(name = "platforms", version = "0.0.9")
+bazel_dep(name = "protobuf", version = "26.0.bcr.1")
 
 # Not yet available in the bazel central registry.
 archive_override(
@@ -101,3 +104,13 @@ pip.parse(
     requirements_lock = "@bzl7//python/pip:requirements_lock.txt",
 )
 use_repo(pip, "pip_example_3_12")
+
+go_sdk = use_extension("@rules_go//go:extensions.bzl", "go_sdk")
+go_sdk.download(version = "1.22.2")
+
+go_deps = use_extension("@gazelle//:extensions.bzl", "go_deps")
+go_deps.from_file(go_mod = "//go/grpc:go.mod")
+use_repo(
+    go_deps,
+    "org_golang_google_grpc",
+)

projects/bzl7/go/README.md

@@ -1,9 +1,18 @@
 # go
 
-We use Gazelle to generate the `BUILD.bazel` files for this project. Simply do:
+We use Gazelle to generate the `BUILD.bazel` files for this project. You'll notice for the `gazelle/` example, there are no `BUILD.bazel` files in there so simply do the following to create them:
+```bash
+bazel run //:gazelle
 ```
-# generates the BUILD files
-bazel run gazelle
-# executes the binary
-bazel run //go/gazelle
+
+## grpc
+
+For the `grpc` examples, you'll need two terminals open. One to run the server:
+```bash
+bazel run //go/grpc/server
+```
+
+Another to act as the client:
+```bash
+bazel run //go/grpc/client -- --echo="hello"
 ```

projects/bzl7/go/grpc/client/BUILD.bazel

@@ -0,0 +1,19 @@
+load("@rules_go//go:def.bzl", "go_binary", "go_library")
+
+go_library(
+    name = "client_lib",
+    srcs = ["main.go"],
+    importpath = "github.com/Qarik-Group/disruptor/projects/bzl7/go/grpc/client",
+    visibility = ["//visibility:private"],
+    deps = [
+        "//go/grpc/proto:grpc",
+        "@org_golang_google_grpc//:go_default_library",
+        "@org_golang_google_grpc//credentials/insecure",
+    ],
+)
+
+go_binary(
+    name = "client",
+    embed = [":client_lib"],
+    visibility = ["//visibility:public"],
+)

projects/bzl7/go/grpc/client/main.go

@@ -0,0 +1,44 @@
+// Package main implements a client for the Echoer service.
+package main
+
+import (
+	"context"
+	"flag"
+	"log"
+	"time"
+
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials/insecure"
+
+	pb "github.com/Qarik-Group/disruptor/projects/bzl7/go/grpc/proto"
+)
+
+var (
+	address = flag.String("address", "localhost:50051", "connection address")
+	echo    = flag.String("echo", "", "Echo")
+)
+
+func main() {
+	flag.Parse()
+
+	connection, err := grpc.Dial(
+		*address,
+		grpc.WithTransportCredentials(
+			insecure.NewCredentials(),
+		),
+	)
+	if err != nil {
+		log.Fatalln("error: ", err)
+	}
+	defer connection.Close()
+
+	echoClient := pb.NewEchoerClient(connection)
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second)
+	defer cancel()
+
+	response, err := echoClient.SendEcho(ctx, &pb.EchoRequest{Request: *echo})
+	if err != nil {
+		log.Fatalln("error: ", err)
+	}
+	log.Println("Response: ", response.GetMessage())
+}

projects/bzl7/go/grpc/go.mod

@@ -0,0 +1,13 @@
+module github.com/Qarik-Group/disruptor/projects/bzl7/go/grpc
+
+go 1.22.2
+
+require google.golang.org/grpc v1.63.2
+
+require (
+	golang.org/x/net v0.21.0 // indirect
+	golang.org/x/sys v0.17.0 // indirect
+	golang.org/x/text v0.14.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20240227224415-6ceb2ff114de // indirect
+	google.golang.org/protobuf v1.33.0 // indirect
+)

projects/bzl7/go/grpc/go.sum

@@ -0,0 +1,13 @@
+golang.org/x/net v0.21.0 h1:AQyQV4dYCvJ7vGmJyKki9+PBdyvhkSd8EIx/qb0AYv4=
+golang.org/x/net v0.21.0/go.mod h1:bIjVDfnllIU7BJ2DNgfnXvpSvtn8VRwhlsaeUTyUS44=
+golang.org/x/sys v0.17.0 h1:25cE3gD+tdBA7lp7QfhuV+rJiE9YXTcS3VG1SqssI/Y=
+golang.org/x/sys v0.17.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/text v0.14.0 h1:ScX5w1eTa3QqT8oi6+ziP7dTV1S2+ALU0bI+0zXKWiQ=
+golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
+google.golang.org/genproto v0.0.0-20240227224415-6ceb2ff114de h1:F6qOa9AZTYJXOUEr4jDysRDLrm4PHePlge4v4TGAlxY=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20240227224415-6ceb2ff114de h1:cZGRis4/ot9uVm639a+rHCUaG0JJHEsdyzSQTMX+suY=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20240227224415-6ceb2ff114de/go.mod h1:H4O17MA/PE9BsGx3w+a+W2VOLLD1Qf7oJneAoU6WktY=
+google.golang.org/grpc v1.63.2 h1:MUeiw1B2maTVZthpU5xvASfTh3LDbxHd6IJ6QQVU+xM=
+google.golang.org/grpc v1.63.2/go.mod h1:WAX/8DgncnokcFUldAxq7GeB5DXHDbMF+lLvDomNkRA=
+google.golang.org/protobuf v1.33.0 h1:uNO2rsAINq/JlFpSdYEKIZ0uKD/R9cpdv0T+yoGwGmI=
+google.golang.org/protobuf v1.33.0/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=

projects/bzl7/go/grpc/proto/BUILD.bazel

@@ -0,0 +1,24 @@
+load("@rules_go//go:def.bzl", "go_library")
+load("@rules_go//proto:def.bzl", "go_proto_library")
+load("@rules_proto//proto:defs.bzl", "proto_library")
+
+proto_library(
+    name = "grpc_proto",
+    srcs = ["hello.proto"],
+    visibility = ["//visibility:public"],
+)
+
+go_proto_library(
+    name = "grpc_go_proto",
+    compilers = ["@rules_go//proto:go_grpc"],
+    importpath = "github.com/Qarik-Group/disruptor/projects/bzl7/go/grpc/proto",
+    proto = ":grpc_proto",
+    visibility = ["//visibility:public"],
+)
+
+go_library(
+    name = "grpc",
+    embed = [":grpc_go_proto"],
+    importpath = "github.com/Qarik-Group/disruptor/projects/bzl7/go/grpc/proto",
+    visibility = ["//visibility:public"],
+)

projects/bzl7/go/grpc/proto/hello.proto

@@ -0,0 +1,21 @@
+syntax = "proto3";
+
+option go_package = "github.com/Qarik-Group/disruptor/projects/bzl7/go/grpc";
+
+package echo;
+
+// The echo service definition.
+service Echoer {
+  // Sends an echo request.
+  rpc SendEcho (EchoRequest) returns (EchoReply) {}
+}
+
+// The request echo.
+message EchoRequest {
+  string request = 1;
+}
+
+// The response message containing the echo
+message EchoReply {
+  string message = 1;
+}

projects/bzl7/go/grpc/server/BUILD.bazel

@@ -0,0 +1,18 @@
+load("@rules_go//go:def.bzl", "go_binary", "go_library")
+
+go_library(
+    name = "server_lib",
+    srcs = ["main.go"],
+    importpath = "github.com/Qarik-Group/disruptor/projects/bzl7/go/grpc/server",
+    visibility = ["//visibility:private"],
+    deps = [
+        "//go/grpc/proto:grpc",
+        "@org_golang_google_grpc//:go_default_library",
+    ],
+)
+
+go_binary(
+    name = "server",
+    embed = [":server_lib"],
+    visibility = ["//visibility:public"],
+)

projects/bzl7/go/grpc/server/main.go

@@ -0,0 +1,45 @@
+// Package main implements a server for the Echoer service.
+package main
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"log"
+	"net"
+
+	pb "github.com/Qarik-Group/disruptor/projects/bzl7/go/grpc/proto"
+	"google.golang.org/grpc"
+)
+
+var (
+	port = flag.Int("port", 50051, "The server port")
+)
+
+type server struct {
+	pb.UnimplementedEchoerServer
+}
+
+// SendEcho implements echo.EchoerServer
+func (s *server) SendEcho(ctx context.Context, in *pb.EchoRequest) (*pb.EchoReply, error) {
+	request := in.GetRequest()
+	log.Printf("Received: %v", request)
+	return &pb.EchoReply{Message: request}, nil
+}
+
+func main() {
+	flag.Parse()
+
+	listener, err := net.Listen("tcp", fmt.Sprintf(":%d", *port))
+	if err != nil {
+		log.Fatalf("failed to listen: %v", err)
+	}
+
+	grpcServer := grpc.NewServer()
+	pb.RegisterEchoerServer(grpcServer, &server{})
+	log.Printf("server listening at %v", listener.Addr())
+
+	if err := grpcServer.Serve(listener); err != nil {
+		log.Fatalf("failed to serve: %v", err)
+	}
+}

projects/bzl7/platforms/BUILD.bazel

@@ -3,27 +3,39 @@ package(default_visibility = ["//visibility:public"])
 platform(
     name = "gcc_10",
     constraint_values = [
-        "//platforms/cpp:gcc_10"
+        "//platforms/cpp:gcc_10",
+    ],
+    parents = [
+        "@rules_nixpkgs_core//platforms:host",
     ],
 )
 
 platform(
     name = "gcc_11",
     constraint_values = [
-        "//platforms/cpp:gcc_11"
+        "//platforms/cpp:gcc_11",
+    ],
+    parents = [
+        "@rules_nixpkgs_core//platforms:host",
     ],
 )
 
 platform(
     name = "gcc_12",
     constraint_values = [
-        "//platforms/cpp:gcc_12"
+        "//platforms/cpp:gcc_12",
+    ],
+    parents = [
+        "@rules_nixpkgs_core//platforms:host",
     ],
 )
 
 platform(
     name = "gcc_13",
     constraint_values = [
-        "//platforms/cpp:gcc_13"
+        "//platforms/cpp:gcc_13",
+    ],
+    parents = [
+        "@rules_nixpkgs_core//platforms:host",
     ],
 )