Add initiator field and parse url (#3558)

- Add initiator field to flow proto
- Parse URL
- Update a few trace logs

flow/client/client.go

@@ -6,7 +6,7 @@ import (
 	"crypto/x509"
 	"errors"
 	"fmt"
-	"strings"
+	"net/url"
 	"sync"
 	"time"
 
@@ -31,9 +31,12 @@ type GRPCClient struct {
 }
 
 func NewClient(addr, payload, signature string, interval time.Duration) (*GRPCClient, error) {
+	parsedURL, err := url.Parse(addr)
+	if err != nil {
+		return nil, fmt.Errorf("parsing url: %w", err)
+	}
 	var opts []grpc.DialOption
-
-	if strings.Contains(addr, "443") {
+	if parsedURL.Scheme == "https" {
 		certPool, err := x509.SystemCertPool()
 		if err != nil || certPool == nil {
 			log.Debugf("System cert pool not available; falling back to embedded cert, error: %v", err)
@@ -58,7 +61,7 @@ func NewClient(addr, payload, signature string, interval time.Duration) (*GRPCCl
 		grpc.WithDefaultServiceConfig(`{"healthCheckConfig": {"serviceName": ""}}`),
 	)
 
-	conn, err := grpc.NewClient(addr, opts...)
+	conn, err := grpc.NewClient(fmt.Sprintf("%s:%s", parsedURL.Hostname(), parsedURL.Port()), opts...)
 	if err != nil {
 		return nil, fmt.Errorf("creating new grpc client: %w", err)
 	}
@@ -100,6 +103,11 @@ func (c *GRPCClient) establishStreamAndReceive(ctx context.Context, msgHandler f
 		return fmt.Errorf("create event stream: %w", err)
 	}
 
+	err = stream.Send(&proto.FlowEvent{IsInitiator: true})
+	if err != nil {
+		log.Infof("failed to send initiator message to flow receiver but will attempt to continue. Error: %s", err)
+	}
+
 	if err = checkHeader(stream); err != nil {
 		return fmt.Errorf("check header: %w", err)
 	}