[WIP] Add "wizard createconfig" command to easily populate configuration files

cmd/ltctl/main.go

@@ -420,6 +420,31 @@ func main() {
 	comparisonCmd.AddCommand(runComparisonCmd, destroyComparisonCmd, collectComparisonCmd)
 	rootCmd.AddCommand(comparisonCmd)
 
+	wizardCmd := &cobra.Command{
+		Use:               "wizard",
+		Short:             "Wizard utilities to setup the",
+		PersistentPreRun:  func(cmd *cobra.Command, _ []string) { setServiceEnv(cmd) },
+		PersistentPostRun: func(_ *cobra.Command, _ []string) { os.Unsetenv("MM_SERVICEENVIRONMENT") },
+	}
+
+	wizardCreateConfigCmd := &cobra.Command{
+		Use:   "createconfig",
+		Short: "Create configuration files",
+		RunE:  RunWizardCreateConfigF,
+	}
+	wizardCreateConfigCmd.Flags().Bool("create-config", true, "Create a config.json file")
+	wizardCreateConfigCmd.Flags().Bool("create-deployer", true, "Create a deployer.json file")
+	wizardCreateConfigCmd.Flags().Int("active-users", 1000, "Number of expected concurrent active users")
+	wizardCreateConfigCmd.Flags().Bool("with-elasticsearch", false, "Enable Elasticsearch")
+	wizardCreateConfigCmd.Flags().Bool("with-keycloak", false, "Enable Keycloak")
+	// cmd.Flags().String("license-file-path", "", "Path to the license file")
+	// cmd.MarkFlagRequired("license-file-path")
+
+	wizardCmdCommands := []*cobra.Command{wizardCreateConfigCmd}
+
+	wizardCmd.AddCommand(wizardCmdCommands...)
+	rootCmd.AddCommand(wizardCmd)
+
 	if err := rootCmd.Execute(); err != nil {
 		os.Exit(1)
 	}

cmd/ltctl/wizard.go

@@ -0,0 +1,83 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+
+	"github.com/mattermost/mattermost-load-test-ng/defaults"
+	"github.com/mattermost/mattermost-load-test-ng/deployment"
+	"github.com/mattermost/mattermost-load-test-ng/loadtest"
+	"github.com/spf13/cobra"
+)
+
+func RunWizardCreateConfigF(cmd *cobra.Command, args []string) error {
+	activeUsers, err := cmd.Flags().GetInt("active-users")
+	if err != nil {
+		return fmt.Errorf("failed to get active users flag: %w", err)
+	}
+
+	arch, ok := deployment.Architectures[activeUsers]
+	if !ok {
+		var keys []string
+		for k := range deployment.Architectures {
+			keys = append(keys, fmt.Sprintf("%d", k))
+		}
+		return fmt.Errorf("reference architecture for %d users not found. Use one of: %s", activeUsers, keys)
+	}
+
+	createDeployerConfig, err := cmd.Flags().GetBool("create-deployer")
+	if err != nil {
+		return fmt.Errorf("failed to get create deployer flag: %w", err)
+	}
+
+	if createDeployerConfig {
+		deployerConfig := deployment.Config{}
+		defaults.Set(&deployerConfig)
+
+		deployerConfig.AppInstanceCount = arch.AppServers.Count
+		deployerConfig.AppInstanceType = arch.AppServers.InstanceType
+
+		deployerConfig.TerraformDBSettings.InstanceCount = arch.DatabaseServer.Count
+		deployerConfig.TerraformDBSettings.InstanceType = arch.DatabaseServer.InstanceType
+
+		if err := writeToFile("./config/deployer.json", deployerConfig); err != nil {
+			return fmt.Errorf("failed to write deployer config: %w", err)
+		}
+	}
+
+	createConfig, err := cmd.Flags().GetBool("create-config")
+	if err != nil {
+		return fmt.Errorf("failed to get create deployer flag: %w", err)
+	}
+
+	if createConfig {
+		config := loadtest.Config{}
+		defaults.Set(&config)
+
+		if err := writeToFile("./config/config.json", config); err != nil {
+			return fmt.Errorf("failed to write config: %w", err)
+		}
+	}
+
+	return nil
+}
+
+func writeToFile(filename string, cfg any) error {
+	data, err := json.MarshalIndent(cfg, "", "  ")
+	if err != nil {
+		return fmt.Errorf("failed to marshal config: %w", err)
+	}
+
+	f, err := os.OpenFile(filename, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0644)
+	if err != nil {
+		return fmt.Errorf("failed to open %s: %w", filename, err)
+	}
+	defer f.Close()
+
+	if _, err := f.Write(data); err != nil {
+		return fmt.Errorf("failed to write %s: %w", filename, err)
+	}
+
+	return nil
+}

deployment/infrastructure.go

@@ -0,0 +1,26 @@
+package deployment
+
+type Server struct {
+	Count        int
+	InstanceType string
+}
+
+type ReferenceArchitecture struct {
+	ActiveUsers    int
+	AppServers     Server
+	DatabaseServer Server
+}
+
+var Architectures = map[int]ReferenceArchitecture{
+	100: {
+		ActiveUsers: 100,
+		AppServers: Server{
+			Count:        1,
+			InstanceType: "c6i.large",
+		},
+		DatabaseServer: Server{
+			Count:        1,
+			InstanceType: "db.r6g.large",
+		},
+	},
+}