Rebase with upstream. Added topic environment variable.

Signed-off-by: Rishabh Gupta<r.g.gupta@outlook.com>

Author: zeerorg

cmd/tester/Gopkg.lock

@@ -27,7 +27,7 @@
 
 [[constraint]]
   name = "github.com/openfaas-incubator/connector-sdk"
-  version = "0.2.0"
+  version = "0.3.1"
 
 [prune]
   go-tests = true

cmd/tester/Gopkg.toml

@@ -14,5 +14,5 @@ To check if it actually works and triggers a function, deploy any function with
 You can also run this command to deploy a sample function and see `trigger-func` invocation count growing in ui.
 
 ```bash
-faas-cli deploy --image=functions/nodeinfo --name=trigger-func --annotation topic=faas-request
+faas-cli deploy --image=functions/nodeinfo --name=trigger-func --annotation topic=vm.powered.on
 ```

cmd/tester/README.md

@@ -5,19 +5,19 @@
 package main
 
 import (
+	"errors"
 	"log"
+	"os"
 	"time"
 
 	"github.com/openfaas-incubator/connector-sdk/types"
 )
 
 func main() {
 	creds := types.GetCredentials()
-	config := &types.ControllerConfig{
-		RebuildInterval:   time.Millisecond * 1000,
-		GatewayURL:        "http://127.0.0.1:8080",
-		PrintResponse:     true,
-		PrintResponseBody: true,
+	config, err := getControllerConfig()
+	if err != nil {
+		panic(err)
 	}
 
 	controller := types.NewController(creds, config)
@@ -27,11 +27,16 @@ func main() {
 
 	controller.BeginMapBuilder()
 
+	topic, err := getTopic()
+	if err != nil {
+		panic(err)
+	}
+
 	// Simulate events emitting from queue/pub-sub
 	for {
 		time.Sleep(2 * time.Second)
 		data := []byte("test " + time.Now().String())
-		controller.Invoke("vm.powered.on", &data)
+		controller.Invoke(topic, &data)
 	}
 
 }
@@ -49,4 +54,27 @@ func (ResponseReceiver) Response(res types.InvokerResponse) {
 	} else {
 		log.Printf("tester got result: [%d] %s => %s (%d) bytes", res.Status, res.Topic, res.Function, len(*res.Body))
 	}
-}
+}
+
+func getControllerConfig() (*types.ControllerConfig, error) {
+	gatewayURL, ok := os.LookupEnv("gateway_url")
+	if !ok {
+		return nil, errors.New("Gateway URL not set")
+	}
+
+	return &types.ControllerConfig{
+		RebuildInterval:   time.Millisecond * 1000,
+		GatewayURL:        gatewayURL,
+		PrintResponse:     true,
+		PrintResponseBody: true,
+	}, nil
+}
+
+func getTopic() (string, error) {
+	topic, ok := os.LookupEnv("topic")
+	if !ok {
+		return "", errors.New("topic not provided")
+	}
+
+	return topic, nil
+}