Add grpc samples

grpc/Dockerfile.client

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+FROM icr.io/codeengine/golang:latest AS stage
+
+WORKDIR /app/src
+
+COPY client/ ./client/
+
+COPY ecommerce/ ./ecommerce/
+
+COPY go.mod .
+
+COPY go.sum .
+
+RUN CGO_ENABLED=0 GOOS=linux go build -o client ./client
+
+FROM icr.io/codeengine/golang:latest
+
+WORKDIR /app/src
+
+COPY --from=stage /app/src/client/client .
+
+CMD [ "./client" ]

grpc/Dockerfile.server

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+FROM icr.io/codeengine/golang:latest AS stage
+
+WORKDIR /app/src
+
+COPY server/ ./server/
+
+COPY ecommerce/ ./ecommerce/
+
+COPY go.mod .
+
+COPY go.sum .
+
+RUN CGO_ENABLED=0 GOOS=linux go build -o server ./server
+
+FROM icr.io/codeengine/golang:latest
+
+WORKDIR /app/src
+
+COPY --from=stage /app/src/server/server .
+
+CMD [ "./server" ]

grpc/README.md

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+# gRPC Application
+
+A basic gRPC microservice architecture, involving a gRPC server and a
+client, that allow users to buy items from an online store.
+
+The ecommerce interface provided by the gRPC server, allows users to
+list and buy groceries via the public client/server application.
+
+The client/server application is deployed as a Code Engine application,
+with a public endpoint. While the gRPC server is deployed as a Code Engine
+application only exposed to the Code Engine project.
+
+See architecture diagram:
+
+![Alt text](images/grpc-architecture.png)
+
+## Source code
+
+Check the source code if you want to understand how this works. In general,
+we provided three directories:
+
+- `/ecommerce` directory hosts the protobuf files and declares the `grocery`
+  interface for a set of remote procedures that can be called by clients. This directory
+  can be regenerated upon changes to the `.proto` file, by calling the `./regenerate-grpc-code.sh`.
+- `/server` directory hosts the `grocery` interface implementation and creates a gRPC server.
+- `/client` directory defines an http server and calls the gRPC server via its different
+  handlers.
+
+## Try it!
+
+You can try to deploy this microservice architecture in your Code Engine project.
+Once you have selected your Code Engine project, you only need to run:
+
+```sh
+./run
+```
+
+If you want to clean-up resources from this sample app, do not forget to run:
+
+```sh
+./run clean
+```

grpc/build

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+#!/bin/bash
+
+set -euo pipefail
+
+# Env Vars:
+# REGISTRY: name of the image registry/namespace to store the images
+#
+# NOTE: to run this you MUST set the REGISTRY environment variable to
+# your own image registry/namespace otherwise the `docker push` commands
+# will fail due to an auth failure. Which means, you also need to be logged
+# into that registry before you run it.
+
+export REGISTRY=${REGISTRY:-icr.io/codeengine}
+
+# Build the images
+docker build -f Dockerfile.client -t "${REGISTRY}"/grpc-client . --platform linux/amd64
+docker build -f Dockerfile.server -t "${REGISTRY}"/grpc-server . --platform linux/amd64
+
+# And push it
+docker push "${REGISTRY}"/grpc-client
+docker push "${REGISTRY}"/grpc-server

grpc/client/main.go

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+package main
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"log"
+	"net/http"
+	"os"
+	"strconv"
+	"time"
+
+	"github.com/gorilla/mux"
+	ec "github.com/qu1queee/CodeEngine/grpc/ecommerce"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials/insecure"
+)
+
+func indexHandler(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "application/json; charset=UFT-8")
+	json.NewEncoder(w).Encode("server is running")
+}
+
+func GetGroceryHandler(groceryClient ec.GroceryClient) func(w http.ResponseWriter, r *http.Request) {
+	return func(w http.ResponseWriter, r *http.Request) {
+		GetHandler(w, r, groceryClient)
+	}
+}
+
+func BuyGroceryHandler(groceryClient ec.GroceryClient) func(w http.ResponseWriter, r *http.Request) {
+	return func(w http.ResponseWriter, r *http.Request) {
+		BuyHandler(w, r, groceryClient)
+	}
+}
+
+func Fail(w http.ResponseWriter, msg string, err error) {
+	fmt.Printf("%s: %v\n", msg, err)
+	w.WriteHeader(http.StatusBadRequest)
+	w.Write([]byte(fmt.Sprintf("%s\n", msg)))
+}
+
+func GetHandler(w http.ResponseWriter, r *http.Request, groceryClient ec.GroceryClient) {
+
+	// Contact the server and print out its response.
+	ctx, cancel := context.WithTimeout(context.Background(), time.Minute*1)
+	defer cancel()
+
+	vars := mux.Vars(r)
+
+	categoryName := vars["category"]
+
+	category := ec.Category{
+		Category: categoryName,
+	}
+
+	itemList, err := groceryClient.ListGrocery(ctx, &category)
+	if err != nil {
+		Fail(w, "failed to list groceries", err)
+		return
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(itemList.Item)
+}
+
+func BuyHandler(w http.ResponseWriter, r *http.Request, groceryClient ec.GroceryClient) {
+	vars := mux.Vars(r)
+
+	itemName := vars["name"]
+	pAmount := vars["amount"]
+	categoryName := vars["category"]
+
+	amount, err := strconv.ParseFloat(pAmount, 64)
+	if err != nil {
+		Fail(w, "invalid amount parameter", err)
+	}
+
+	category := ec.Category{
+		Category: categoryName,
+		Itemname: itemName,
+	}
+
+	item, err := groceryClient.GetGrocery(context.Background(), &category)
+	if err != nil {
+		Fail(w, fmt.Sprintf("failed to get grocery item by name: %v", category.Itemname), err)
+		return
+	}
+
+	paymentRequest := ec.PaymentRequest{
+		Amount: amount,
+		Item:   item,
+	}
+
+	paymentResponse, _ := groceryClient.BuyGrocery(context.Background(), &paymentRequest)
+
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(paymentResponse)
+}
+
+func main() {
+	localEndpoint := os.Getenv("LOCAL_ENDPOINT_WITH_PORT")
+
+	fmt.Printf("using local endpoint: %s\n", localEndpoint)
+	conn, err := grpc.Dial(localEndpoint, grpc.WithTransportCredentials(insecure.NewCredentials()))
+	if err != nil {
+		log.Fatalf("failed to connect: %v", err)
+	}
+
+	defer conn.Close()
+
+	c := ec.NewGroceryClient(conn)
+
+	r := mux.NewRouter()
+	r.HandleFunc("/", indexHandler).Methods("GET")
+	r.HandleFunc("/listgroceries/{category}", GetGroceryHandler(c))
+	r.HandleFunc("/buygrocery/{category}/{name}/{amount:[0-9]+\\.[0-9]+}", BuyGroceryHandler(c))
+	fmt.Println("server app is running on :8080 .....")
+	http.ListenAndServe(":8080", r)
+}