enhance helloworld image to support fleets

Author: jeremiaswerner

helloworld/helloworld.go

@@ -167,10 +167,16 @@ func HandleHTTP(w http.ResponseWriter, r *http.Request) {
 }
 
 func IsJob() bool {
-	// If we're being run as a Batch Jobthen the JOB_INDEX env var will be set.
+	// If we're being run as a Batch Job then the JOB_INDEX env var will be set.
+	// If we're being run as a Fleet then the CE_TASK_INDEX or CE_TASK_ID env var will be set.
 	return os.Getenv("JOB_INDEX") != ""
 }
 
+func IsFleet() bool {
+	// If we're being run as a Fleet then the CE_TASK_INDEX or CE_TASK_ID env var will be set.
+	return os.Getenv("CE_TASK_INDEX") != "" || os.Getenv("CE_TASK_ID") != ""
+}
+
 func AppURL() string {
 	return fmt.Sprintf("%s.%s.%s", os.Getenv("CE_APP"), os.Getenv("CE_SUBDOMAIN"), os.Getenv("CE_DOMAIN"))
 }
@@ -292,9 +298,8 @@ func main() {
 	Debug(false, "Envs:\n%s", strings.Join(envs, "\n"))
 
 	// Real work.
-	// If we're being run as a Batch Job just print the message to stdout.
-	// Otherwise we're an App and we need to start the HTTP server
-	// to processing incoming requests
+	// If run as part of a Batch Job or Fleet it just prints the message to stdout.
+	// Otherwise run as part of an App and start the HTTP server to processing incoming requests
 	if IsJob() {
 		// Jobs can be either started in 'task' mode and run to completion or in 'daemon' mode which
 		jobMode := os.Getenv("JOB_MODE")
@@ -330,6 +335,31 @@ func main() {
 				break
 			}
 		}
+	} else if IsFleet() {
+		// Fleet tasks run to completion
+
+		fleetName := os.Getenv("CE_FLEET_NAME")
+
+		sleep := os.Getenv("SLEEP")
+		sleepDuration := 0
+		if sleep != "" {
+			sleepDuration, _ = strconv.Atoi(sleep)
+		}
+
+		// Check whether the job should sleep a while before printing the helloworld statement
+		if sleepDuration > 0 {
+			Debug(false, "Sleeping %ds", sleepDuration)
+			time.Sleep(time.Duration(sleepDuration) * time.Second)
+		}
+
+		fmt.Printf("Hello from helloworld! I'm a task of fleet: %s! Task Index: %s, Task ID: %s\n\n", fleetName, os.Getenv("CE_TASK_INDEX"), os.Getenv("CE_TASK_ID"))
+		PrintMessage(os.Stdout, os.Getenv("SHOW") == "")
+
+		// If the 'CRASH' or 'FAIL' env vars are set then crash!
+		if os.Getenv("CRASH") != "" || os.Getenv("FAIL") != "" {
+			fmt.Printf("Crashing...")
+			os.Exit(1)
+		}
 
 	} else {
 		srv := &http.Server{Addr: ":8080"}