[1/2] Implement the --local-execution mode for k6 cloud run

cmd/cloud.go

@@ -382,7 +382,7 @@ To run tests in the cloud, users are now invited to migrate to the "k6 cloud run
 	}
 
 	// Register `k6 cloud` subcommands
-	cloudCmd.AddCommand(getCmdCloudRun(gs))
+	cloudCmd.AddCommand(getCmdCloudRun(c))
 	cloudCmd.AddCommand(getCmdCloudLogin(gs))
 
 	cloudCmd.Flags().SortFlags = false

cmd/cloud_run.go

@@ -1,21 +1,62 @@
 package cmd
 
 import (
+	"fmt"
+
 	"github.com/spf13/cobra"
-	"go.k6.io/k6/cmd/state"
+	"github.com/spf13/pflag"
+	"go.k6.io/k6/execution"
+	"go.k6.io/k6/execution/local"
 )
 
 const cloudRunCommandName string = "run"
 
-func getCmdCloudRun(gs *state.GlobalState) *cobra.Command {
-	deprecatedCloudCmd := &cmdCloud{
-		gs:            gs,
-		showCloudLogs: true,
-		exitOnRunning: false,
-		uploadOnly:    false,
+type cmdCloudRun struct {
+	// localExecution stores the state of the --local-execution flag.
+	localExecution bool
+
+	// linger stores the state of the --linger flag.
+	linger bool
+
+	// noUsageReport stores the state of the --no-usage-report flag.
+	noUsageReport bool
+
+	// runCmd holds an instance of the k6 run command that we store
+	// in order to be able to call its run method to support
+	// the --local-execution flag mode.
+	runCmd *cmdRun
+
+	// deprecatedCloudCmd holds an instance of the k6 cloud command that we store
+	// in order to be able to call its run method to support the cloud execution
+	// feature, and to have access to its flagSet if necessary.
+	deprecatedCloudCmd *cmdCloud
+}
+
+func getCmdCloudRun(cloudCmd *cmdCloud) *cobra.Command {
+	// We instantiate the run command here to be able to call its run method
+	// when the --local-execution flag is set.
+	runCmd := &cmdRun{
+		gs: cloudCmd.gs,
+
+		// We override the loadConfiguredTest func to use the local execution
+		// configuration which enforces the use of the cloud output among other
+		// side effects.
+		loadConfiguredTest: func(cmd *cobra.Command, args []string) (
+			*loadedAndConfiguredTest,
+			execution.Controller,
+			error,
+		) {
+			test, err := loadAndConfigureLocalTest(cloudCmd.gs, cmd, args, getCloudRunLocalExecutionConfig)
+			return test, local.NewController(), err
+		},
 	}
 
-	exampleText := getExampleText(gs, `
+	cloudRunCmd := &cmdCloudRun{
+		deprecatedCloudCmd: cloudCmd,
+		runCmd:             runCmd,
+	}
+
+	exampleText := getExampleText(cloudCmd.gs, `
   # Run a test script in Grafana Cloud k6
   $ {{.}} cloud run script.js
 
@@ -25,7 +66,7 @@ func getCmdCloudRun(gs *state.GlobalState) *cobra.Command {
   # Read a test script or archive from stdin and run it in Grafana Cloud k6
   $ {{.}} cloud run - < script.js`[1:])
 
-	cloudRunCmd := &cobra.Command{
+	thisCmd := &cobra.Command{
 		Use:   cloudRunCommandName,
 		Short: "Run a test in Grafana Cloud k6",
 		Long: `Run a test in Grafana Cloud k6.
@@ -38,12 +79,87 @@ Use the "k6 cloud login" command to authenticate.`,
 			"the k6 cloud run command expects a single argument consisting in either a path to a script or "+
 				"archive file, or the \"-\" symbol indicating the script or archive should be read from stdin",
 		),
-		PreRunE: deprecatedCloudCmd.preRun,
-		RunE:    deprecatedCloudCmd.run,
+		PreRunE: cloudRunCmd.preRun,
+		RunE:    cloudRunCmd.run,
+	}
+
+	thisCmd.Flags().SortFlags = false
+	thisCmd.Flags().AddFlagSet(cloudRunCmd.flagSet())
+	thisCmd.Flags().AddFlagSet(cloudCmd.flagSet())
+
+	return thisCmd
+}
+
+func (c *cmdCloudRun) preRun(cmd *cobra.Command, args []string) error {
+	if c.localExecution {
+		return nil
+	}
+
+	if c.linger {
+		return fmt.Errorf("the --linger flag can only be used in conjunction with the --local-execution flag")
+	}
+
+	if c.noUsageReport {
+		return fmt.Errorf("the --no-usage-report can only be used in conjunction with the --local-execution flag")
+	}
+
+	return c.deprecatedCloudCmd.preRun(cmd, args)
+}
+
+func (c *cmdCloudRun) run(cmd *cobra.Command, args []string) error {
+	if c.localExecution {
+		if cmd.Flags().Changed("exit-on-running") {
+			return fmt.Errorf("the --local-execution flag is not compatible with the --exit-on-running flag")
+		}
+
+		if cmd.Flags().Changed("show-logs") {
+			return fmt.Errorf("the --local-execution flag is not compatible with the --show-logs flag")
+		}
+
+		return c.runCmd.run(cmd, args)
+	}
+
+	// When executing in the cloud, we enforce the usage report to be deactivated.
+	c.noUsageReport = true
+
+	return c.deprecatedCloudCmd.run(cmd, args)
+}
+
+func (c *cmdCloudRun) flagSet() *pflag.FlagSet {
+	flags := pflag.NewFlagSet("", pflag.ContinueOnError)
+	flags.SortFlags = false
+
+	flags.BoolVar(&c.localExecution, "local-execution", c.localExecution,
+		"executes the test locally instead of in the cloud")
+	flags.BoolVar(
+		&c.linger,
+		"linger",
+		c.linger,
+		"only when using the local-execution mode, keeps the API server alive past the test end",
+	)
+	flags.BoolVar(
+		&c.noUsageReport,
+		"no-usage-report",
+		c.noUsageReport,
+		"only when using the local-execution mode, don't send anonymous stats to the developers",
+	)
+
+	return flags
+}
+
+func getCloudRunLocalExecutionConfig(flags *pflag.FlagSet) (Config, error) {
+	opts, err := getOptions(flags)
+	if err != nil {
+		return Config{}, err
 	}
 
-	cloudRunCmd.Flags().SortFlags = false
-	cloudRunCmd.Flags().AddFlagSet(deprecatedCloudCmd.flagSet())
+	// When running locally, we force the output to be cloud.
+	out := []string{"cloud"}
 
-	return cloudRunCmd
+	return Config{
+		Options:       opts,
+		Out:           out,
+		Linger:        getNullBool(flags, "linger"),
+		NoUsageReport: getNullBool(flags, "no-usage-report"),
+	}, nil
 }

cmd/tests/cmd_cloud_run_test.go

@@ -1,6 +1,11 @@
 package tests
 
-import "testing"
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"go.k6.io/k6/cmd"
+)
 
 func TestK6CloudRun(t *testing.T) {
 	t.Parallel()
@@ -10,3 +15,49 @@ func TestK6CloudRun(t *testing.T) {
 func setupK6CloudRunCmd(cliFlags []string) []string {
 	return append([]string{"k6", "cloud", "run"}, append(cliFlags, "test.js")...)
 }
+
+func TestCloudRunCommandIncompatibleFlags(t *testing.T) {
+	t.Parallel()
+
+	testCases := []struct {
+		name               string
+		cliArgs            []string
+		wantStderrContains string
+	}{
+		{
+			name:               "using --linger should be incompatible with k6 cloud run",
+			cliArgs:            []string{"--linger"},
+			wantStderrContains: "the --linger flag can only be used in conjunction with the --local-execution flag",
+		},
+		{
+			name:               "using --no-usage-report linger should be incompatible with k6 cloud run",
+			cliArgs:            []string{"--no-usage-report"},
+			wantStderrContains: "the --no-usage-report can only be used in conjunction with the --local-execution flag",
+		},
+		{
+			name:               "using --exit-on-running should be incompatible with k6 cloud run --local-execution",
+			cliArgs:            []string{"--local-execution", "--exit-on-running"},
+			wantStderrContains: "the --local-execution flag is not compatible with the --exit-on-running flag",
+		},
+		{
+			name:               "using --show-logs should be incompatible with k6 cloud run --local-execution",
+			cliArgs:            []string{"--local-execution", "--show-logs"},
+			wantStderrContains: "the --local-execution flag is not compatible with the --show-logs flag",
+		},
+	}
+
+	for _, tc := range testCases {
+		tc := tc
+
+		t.Run(tc.name, func(t *testing.T) {
+			t.Parallel()
+
+			ts := getSimpleCloudTestState(t, nil, setupK6CloudRunCmd, tc.cliArgs, nil, nil)
+			ts.ExpectedExitCode = -1
+			cmd.ExecuteWithGlobalState(ts.GlobalState)
+
+			stderr := ts.Stderr.String()
+			assert.Contains(t, stderr, tc.wantStderrContains)
+		})
+	}
+}