Load testing: synthetic VMs, multiple worker support and Grafana k6 test (#389)

* Load testing: synthetic VMs, multiple worker support and Grafana k6 test

* echoserver: prevent fallthrough when Accept() fails

* Move default local-dev context logic to CreateDevController()

* Synthetic: add a random delay to startup script echoing

pkg/client/client.go

@@ -16,6 +16,7 @@ import (
 	"time"
 
 	"github.com/cirruslabs/orchard/internal/config"
+	"github.com/cirruslabs/orchard/internal/dialer"
 	"github.com/cirruslabs/orchard/internal/version"
 	"github.com/cirruslabs/orchard/rpc"
 	"github.com/coder/websocket"
@@ -42,7 +43,7 @@ type Client struct {
 	serviceAccountName  string
 	serviceAccountToken string
 
-	dialContext func(ctx context.Context, network, addr string) (net.Conn, error)
+	dialer dialer.Dialer
 }
 
 type Config struct {
@@ -84,8 +85,8 @@ func New(opts ...Option) (*Client, error) {
 		TLSClientConfig: client.tlsConfig,
 	}
 
-	if client.dialContext != nil {
-		transport.DialContext = client.dialContext
+	if client.dialer != nil {
+		transport.DialContext = client.dialer.DialContext
 	}
 
 	client.httpClient = &http.Client{

pkg/client/option.go

@@ -1,9 +1,9 @@
 package client
 
 import (
-	"context"
 	"crypto/x509"
-	"net"
+
+	"github.com/cirruslabs/orchard/internal/dialer"
 )
 
 type Option func(*Client)
@@ -27,8 +27,8 @@ func WithCredentials(serviceAccountName string, serviceAccountToken string) Opti
 	}
 }
 
-func WithDialContext(dialContext func(ctx context.Context, network, addr string) (net.Conn, error)) Option {
+func WithDialer(dialer dialer.Dialer) Option {
 	return func(client *Client) {
-		client.dialContext = dialContext
+		client.dialer = dialer
 	}
 }