Added 'hello-world' example (dapr#171)

examples/hello-world/Makefile

@@ -0,0 +1,14 @@
+.PHONY: bin go-mod go-check clean
+
+bin: go-mod
+	go build -o order order.go
+
+go-mod: go-check
+	go mod tidy
+	go mod vendor
+
+go-check:
+	@which go > /dev/null
+
+clean:
+	rm -f ./order

examples/hello-world/README.md

@@ -0,0 +1,128 @@
+# Hello World
+
+This tutorial will demonstrate how to instrument your application with Dapr, and run it locally on your machine.
+You will deploying `order` applications with the flow identical to [Hello World](https://github.com/dapr/quickstarts/tree/master/hello-world).
+
+The application invokes Dapr API via Dapr client, which, in turn, calls Dapr runtime.
+
+The following architecture diagram illustrates the components that make up this quickstart:
+
+![Architecture Diagram](./img/arch-diag1.png)
+
+Dapr runtime supports multiple applications that could communicate with one another.
+In a later example, you'll deploy two instances of the `order` app - one will update the state store, while another will read from it.
+
+The architecture diagram below shows the addition of the new component:
+
+![Architecture Diagram Final](./img/arch-diag2.png)
+
+## Prerequisites
+This quickstart requires you to have the following installed on your machine:
+- [Docker](https://docs.docker.com/)
+- [Go](https://golang.org/)
+
+## Step 1 - Setup Dapr
+
+Follow [instructions](https://docs.dapr.io/getting-started/install-dapr/) to download and install the Dapr CLI and initialize Dapr.
+
+## Step 2 - Understand the code
+
+Now that Dapr is set up locally, clone the repo, then navigate to the Hello World SDK quickstart:
+
+```sh
+git clone [-b <dapr_version_tag>] https://github.com/dapr/quickstarts.git
+cd quickstarts/hello-world-sdk
+```
+
+The [order.go](./order.go) is a simple command line application, that implements four commands:
+* `put` sends an order with configurable order ID.
+* `get` return the current order number.
+* `del` deletes the order.
+* `seq` streams a sequence of orders with incrementing order IDs.
+
+First, the app instantiates Dapr client:
+
+```go
+    client, err := dapr.NewClientWithPort(port)
+    if err != nil {
+        panic(err)
+    }
+    defer client.Close()
+```
+
+Then, depending on the command line argument, the app invokes corresponding method:
+
+Persist the state:
+```go
+    err := client.SaveState(ctx, stateStoreName, "order", []byte(strconv.Itoa(orderID)))
+```
+Retrieve the state:
+```go
+    item, err := client.GetState(ctx, stateStoreName, "order")
+```
+Delete the state:
+```go
+    err := client.DeleteState(ctx, stateStoreName, "order")
+```
+
+## Step 3 - Run the app with Dapr
+
+1. Build the app
+
+```bash
+go mod vendor
+go build -o order order.go
+```
+
+2. Run the app
+
+There are two ways to launch Dapr applications. You can pass the app executable to the Dapr runtime:
+
+```bash
+dapr run --app-id order-app --dapr-grpc-port 3500 --log-level error -- ./order put --id 20
+```
+
+```bash
+dapr run --app-id order-app --dapr-grpc-port 3500 --log-level error ./order get
+```
+
+![Screenshot1](./img/screenshot1.png)
+![Screenshot2](./img/screenshot2.png)
+
+Alternatively, you can start a standalone Dapr runtime, and call the app from another shell:
+
+```bash
+dapr run --app-id order-app --dapr-grpc-port 3500 --log-level error
+```
+
+
+```bash
+./order put --id 10
+
+./order get
+```
+
+To terminate your services, simply stop the "dapr run" process, or use the Dapr CLI "stop" command:
+
+```bash
+dapr stop --app-id order-app
+```
+
+![Screenshot3](./img/screenshot3.png)
+
+3. Run multiple apps
+
+You can run more than one app in Dapr runtime. In this example you will call `order seq` which sends a sequence of orders.
+Another instance of the `order` app will read the state.
+
+```sh
+dapr run --app-id order-app --dapr-grpc-port 3500 --log-level error ./order seq
+```
+
+```sh
+./order get
+
+./order get
+```
+
+![Screenshot4](./img/screenshot4.png)

examples/hello-world/go.mod

@@ -0,0 +1,10 @@
+module github.com/dapr/quickstarts/hello-go-sdk
+
+go 1.16
+
+require (
+	github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751 // indirect
+	github.com/alecthomas/units v0.0.0-20210208195552-ff826a37aa15 // indirect
+	github.com/dapr/go-sdk v1.1.0
+	gopkg.in/alecthomas/kingpin.v2 v2.2.6
+)

examples/hello-world/go.sum

@@ -0,0 +1,122 @@
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examples/hello-world/order.go

@@ -0,0 +1,84 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"strconv"
+	"time"
+
+	dapr "github.com/dapr/go-sdk/client"
+	"gopkg.in/alecthomas/kingpin.v2"
+)
+
+const (
+	stateStoreName = `statestore`
+	daprPort       = "3500"
+)
+
+var port string
+
+func init() {
+	if port = os.Getenv("DAPR_GRPC_PORT"); len(port) == 0 {
+		port = daprPort
+	}
+}
+
+func main() {
+	var orderID int
+	put := kingpin.Command("put", "Send a new order.")
+	put.Flag("id", "order ID.").Default("1").IntVar(&orderID)
+	kingpin.Command("get", "Get current order.")
+	kingpin.Command("del", "Delete the order.")
+	kingpin.Command("seq", "Stream sequence of orders.")
+
+	// create the client
+	client, err := dapr.NewClientWithPort(port)
+	if err != nil {
+		panic(err)
+	}
+	defer client.Close()
+	ctx := context.Background()
+
+	switch kingpin.Parse() {
+
+	case "get":
+		fmt.Printf("Getting order\n")
+		item, err := client.GetState(ctx, stateStoreName, "order")
+		if err != nil {
+			fmt.Printf("Failed to get state: %v\n", err)
+		}
+		if len(item.Value) > 0 {
+			fmt.Printf("Order ID %s\n", item.Value)
+		} else {
+			fmt.Printf("Order Not Found\n")
+		}
+	case "put":
+		fmt.Printf("Sending order ID %d\n", orderID)
+		err := client.SaveState(ctx, stateStoreName, "order", []byte(strconv.Itoa(orderID)))
+		if err != nil {
+			fmt.Printf("Failed to persist state: %v\n", err)
+		} else {
+			fmt.Printf("Successfully persisted state\n")
+		}
+	case "del":
+		fmt.Printf("Deleting order\n")
+		err := client.DeleteState(ctx, stateStoreName, "order")
+		if err != nil {
+			fmt.Printf("Failed to delete state: %v\n", err)
+		} else {
+			fmt.Printf("Successfully deleted state\n")
+		}
+	case "seq":
+		fmt.Printf("Streaming sequence of orders\n")
+		for {
+			orderID++
+			err := client.SaveState(ctx, stateStoreName, "order", []byte(strconv.Itoa(orderID)))
+			if err != nil {
+				fmt.Printf("Failed to persist state: %v\n", err)
+				break
+			}
+			time.Sleep(1 * time.Second)
+		}
+	}
+}