Report runtime init errors to localstack (#17)

cmd/localstack/codearchive.go

@@ -41,6 +41,7 @@ func DownloadCodeArchive(url string, targetPath string) error {
 	// create tmp directory
 	// empty string will make use of the default tmp directory
 	tmpDir, err := os.MkdirTemp("", "localstack-code-archive")
+	defer os.RemoveAll(tmpDir)
 	if err != nil {
 		return err
 	}

cmd/localstack/custom_interop.go

@@ -36,9 +36,9 @@ const (
 	Error LocalStackStatus = "error"
 )
 
-func (l *LocalStackAdapter) SendStatus(status LocalStackStatus) error {
+func (l *LocalStackAdapter) SendStatus(status LocalStackStatus, payload []byte) error {
 	status_url := fmt.Sprintf("%s/status/%s/%s", l.UpstreamEndpoint, l.RuntimeId, status)
-	_, err := http.Post(status_url, "text", bytes.NewReader([]byte{}))
+	_, err := http.Post(status_url, "application/json", bytes.NewReader(payload))
 	if err != nil {
 		return err
 	}
@@ -195,7 +195,7 @@ func NewCustomInteropServer(lsOpts *LsOpts, delegate rapidcore.InteropServer, lo
 
 func (c *CustomInteropServer) StartAcceptingDirectInvokes() error {
 	log.Traceln("Function called")
-	err := c.localStackAdapter.SendStatus(Ready)
+	err := c.localStackAdapter.SendStatus(Ready, []byte{})
 	if err != nil {
 		return err
 	}
@@ -209,6 +209,10 @@ func (c *CustomInteropServer) SendResponse(invokeID string, contentType string,
 
 func (c *CustomInteropServer) SendErrorResponse(invokeID string, response *interop.ErrorResponse) error {
 	log.Traceln("Function called")
+	err := c.localStackAdapter.SendStatus(Error, response.Payload)
+	if err != nil {
+		return err
+	}
 	return c.delegate.SendErrorResponse(invokeID, response)
 }
 

cmd/localstack/main.go

@@ -6,8 +6,6 @@ import (
 	"context"
 	log "github.com/sirupsen/logrus"
 	"go.amzn.com/lambda/rapidcore"
-	"net/http"
-	_ "net/http/pprof"
 	"os"
 	"runtime/debug"
 	"strconv"
@@ -27,7 +25,7 @@ type LsOpts struct {
 	InitLogLevel        string
 	EdgePort            string
 	EnableXRayTelemetry string
-	PostInvokeWaitMS     string
+	PostInvokeWaitMS    string
 }
 
 func GetEnvOrDie(env string) string {
@@ -55,7 +53,7 @@ func InitLsOpts() *LsOpts {
 		EnableDnsServer:     os.Getenv("LOCALSTACK_ENABLE_DNS_SERVER"),
 		EnableXRayTelemetry: os.Getenv("LOCALSTACK_ENABLE_XRAY_TELEMETRY"),
 		LocalstackIP:        os.Getenv("LOCALSTACK_HOSTNAME"),
-		PostInvokeWaitMS:     os.Getenv("LOCALSTACK_POST_INVOKE_WAIT_MS"),
+		PostInvokeWaitMS:    os.Getenv("LOCALSTACK_POST_INVOKE_WAIT_MS"),
 	}
 }
 
@@ -113,7 +111,7 @@ func main() {
 
 	// download code archive if env variable is set
 	if err := DownloadCodeArchives(lsOpts.CodeArchives); err != nil {
-		log.Fatal("Failed to download code archives")
+		log.Fatal("Failed to download code archives: " + err.Error())
 	}
 
 	// parse CLI args
@@ -168,6 +166,10 @@ func main() {
 	if len(handler) > 0 {
 		sandbox.SetHandler(handler)
 	}
+	exitChan := make(chan struct{})
+	sandbox.AddShutdownFunc(func() {
+		exitChan <- struct{}{}
+	})
 
 	// initialize all flows and start runtime API
 	go sandbox.Create()
@@ -183,10 +185,5 @@ func main() {
 	// start runtime init
 	go InitHandler(sandbox, GetEnvOrDie("AWS_LAMBDA_FUNCTION_VERSION"), int64(invokeTimeoutSeconds)) // TODO: replace this with a custom init
 
-	// TODO: make the tracing server optional
-	// start blocking with the tracing server
-	err = http.ListenAndServe("0.0.0.0:"+lsOpts.InitTracingPort, http.DefaultServeMux)
-	if err != nil {
-		log.Fatal("Failed to start debug server")
-	}
+	<-exitChan
 }