stackitcloud · DiogoFerrao · May 7, 2024 · May 7, 2024 · May 7, 2024 · May 7, 2024
diff --git a/docs/stackit_load-balancer_target-pool.md b/docs/stackit_load-balancer_target-pool.md
@@ -30,5 +30,6 @@ stackit load-balancer target-pool [flags]
 
 * [stackit load-balancer](./stackit_load-balancer.md)	 - Provides functionality for Load Balancer
 * [stackit load-balancer target-pool add-target](./stackit_load-balancer_target-pool_add-target.md)	 - Adds a target to a target pool
+* [stackit load-balancer target-pool describe](./stackit_load-balancer_target-pool_describe.md)	 - Shows details of a target pool in a Load Balancer
 * [stackit load-balancer target-pool remove-target](./stackit_load-balancer_target-pool_remove-target.md)	 - Removes a target from a target pool
 
diff --git a/docs/stackit_load-balancer_target-pool_describe.md b/docs/stackit_load-balancer_target-pool_describe.md
@@ -0,0 +1,43 @@
+## stackit load-balancer target-pool describe
+
+Shows details of a target pool in a Load Balancer
+
+### Synopsis
+
+Shows details of a target pool in a Load Balancer.
+
+```
+stackit load-balancer target-pool describe TARGET_POOL_NAME [flags]
+```
+
+### Examples
+
+```
+  Get details of a target pool with name "pool" in load balancer with name "my-load-balancer"
+  $ stackit load-balancer target-pool describe pool --lb-name my-load-balancer
+
+  Get details of a target pool with name "pool" in load balancer with name "my-load-balancer in JSON output"
+  $ stackit load-balancer target-pool describe pool --lb-name my-load-balancer --output-format json
+```
+
+### Options
+
+```
+  -h, --help             Help for "stackit load-balancer target-pool describe"
+      --lb-name string   Name of the load balancer
+```
+
+### Options inherited from parent commands
+
+```
+  -y, --assume-yes             If set, skips all confirmation prompts
+      --async                  If set, runs the command asynchronously
+  -o, --output-format string   Output format, one of ["json" "pretty" "none"]
+  -p, --project-id string      Project ID
+      --verbosity string       Verbosity of the CLI, one of ["debug" "info" "warning" "error"] (default "info")
+```
+
+### SEE ALSO
+
+* [stackit load-balancer target-pool](./stackit_load-balancer_target-pool.md)	 - Provides functionality for target pools
+
diff --git a/internal/cmd/load-balancer/target-pool/describe/describe.go b/internal/cmd/load-balancer/target-pool/describe/describe.go
@@ -0,0 +1,203 @@
+package describe
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"strconv"
+	"strings"
+
+	"github.com/stackitcloud/stackit-cli/internal/pkg/args"
+	"github.com/stackitcloud/stackit-cli/internal/pkg/errors"
+	"github.com/stackitcloud/stackit-cli/internal/pkg/examples"
+	"github.com/stackitcloud/stackit-cli/internal/pkg/flags"
+	"github.com/stackitcloud/stackit-cli/internal/pkg/globalflags"
+	"github.com/stackitcloud/stackit-cli/internal/pkg/print"
+	"github.com/stackitcloud/stackit-cli/internal/pkg/services/load-balancer/client"
+	"github.com/stackitcloud/stackit-cli/internal/pkg/services/load-balancer/utils"
+	"github.com/stackitcloud/stackit-cli/internal/pkg/tables"
+
+	"github.com/spf13/cobra"
+	"github.com/stackitcloud/stackit-sdk-go/services/loadbalancer"
+)
+
+const (
+	targetPoolNameArg = "TARGET_POOL_NAME"
+
+	lbNameFlag = "lb-name"
+)
+
+type inputModel struct {
+	*globalflags.GlobalFlagModel
+	TargetPoolName string
+	LBName         string
+}
+
+func NewCmd(p *print.Printer) *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   fmt.Sprintf("describe %s", targetPoolNameArg),
+		Short: "Shows details of a target pool in a Load Balancer",
+		Long:  "Shows details of a target pool in a Load Balancer.",
+		Args:  args.SingleArg(targetPoolNameArg, nil),
+		Example: examples.Build(
+			examples.NewExample(
+				`Get details of a target pool with name "pool" in load balancer with name "my-load-balancer"`,
+				"$ stackit load-balancer target-pool describe pool --lb-name my-load-balancer"),
+			examples.NewExample(
+				`Get details of a target pool with name "pool" in load balancer with name "my-load-balancer in JSON output"`,
+				"$ stackit load-balancer target-pool describe pool --lb-name my-load-balancer --output-format json"),
+		),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			ctx := context.Background()
+			model, err := parseInput(p, cmd, args)
+			if err != nil {
+				return err
+			}
+			// Configure API client
+			apiClient, err := client.ConfigureClient(p)
+			if err != nil {
+				return err
+			}
+
+			// Call API
+			req := buildRequest(ctx, model, apiClient)
+			resp, err := req.Execute()
+			if err != nil {
+				return fmt.Errorf("read load balancer: %w", err)
+			}
+
+			targetPool := utils.FindLoadBalancerTargetPoolByName(*resp.TargetPools, model.TargetPoolName)
+			if targetPool == nil {
+				return fmt.Errorf("target pool not found")
+			}
+
+			listener := utils.FindLoadBalancerListenerByTargetPool(*resp.Listeners, *targetPool.Name)
+
+			return outputResult(p, model.OutputFormat, *targetPool, listener)
+		},
+	}
+	configureFlags(cmd)
+	return cmd
+}
+
+func configureFlags(cmd *cobra.Command) {
+	cmd.Flags().String(lbNameFlag, "", "Name of the load balancer")
+
+	err := flags.MarkFlagsRequired(cmd, lbNameFlag)
+	cobra.CheckErr(err)
+}
+
+func parseInput(p *print.Printer, cmd *cobra.Command, inputArgs []string) (*inputModel, error) {
+	targetPoolName := inputArgs[0]
+
+	globalFlags := globalflags.Parse(p, cmd)
+	if globalFlags.ProjectId == "" {
+		return nil, &errors.ProjectIdError{}
+	}
+
+	model := inputModel{
+		GlobalFlagModel: globalFlags,
+		TargetPoolName:  targetPoolName,
+		LBName:          cmd.Flag(lbNameFlag).Value.String(),
+	}
+
+	if p.IsVerbosityDebug() {
+		modelStr, err := print.BuildDebugStrFromInputModel(model)
+		if err != nil {
+			p.Debug(print.ErrorLevel, "convert model to string for debugging: %v", err)
+		} else {
+			p.Debug(print.DebugLevel, "parsed input values: %s", modelStr)
+		}
+	}
+
+	return &model, nil
+}
+
+func buildRequest(ctx context.Context, model *inputModel, apiClient *loadbalancer.APIClient) loadbalancer.ApiGetLoadBalancerRequest {
+	req := apiClient.GetLoadBalancer(ctx, model.ProjectId, model.LBName)
+	return req
+}
+
+func outputResult(p *print.Printer, outputFormat string, targetPool loadbalancer.TargetPool, listener *loadbalancer.Listener) error {
+	switch outputFormat {
+	case print.JSONOutputFormat:
+		output := struct {
+			*loadbalancer.TargetPool
+			Listener *loadbalancer.Listener `json:"attached_listener"`
+		}{
+			&targetPool,
+			listener,
+		}
+		details, err := json.MarshalIndent(output, "", "  ")
+		if err != nil {
+			return fmt.Errorf("marshal load balancer: %w", err)
+		}
+		p.Outputln(string(details))
+
+		return nil
+	default:
+		return outputResultAsTable(p, targetPool, listener)
+	}
+}
+
+func outputResultAsTable(p *print.Printer, targetPool loadbalancer.TargetPool, listener *loadbalancer.Listener) error {
+	sessionPersistence := "None"
+	if targetPool.SessionPersistence != nil && targetPool.SessionPersistence.UseSourceIpAddress != nil && *targetPool.SessionPersistence.UseSourceIpAddress {
+		sessionPersistence = "Use Source IP"
+	}
+
+	healthCheckInterval := "-"
+	healthCheckUnhealthyThreshold := "-"
+	healthCheckHealthyThreshold := "-"
+	if targetPool.ActiveHealthCheck != nil {
+		if targetPool.ActiveHealthCheck.Interval != nil {
+			healthCheckInterval = *targetPool.ActiveHealthCheck.Interval
+		}
+		if targetPool.ActiveHealthCheck.UnhealthyThreshold != nil {
+			healthCheckUnhealthyThreshold = strconv.FormatInt(*targetPool.ActiveHealthCheck.UnhealthyThreshold, 10)
+		}
+		if targetPool.ActiveHealthCheck.HealthyThreshold != nil {
+			healthCheckHealthyThreshold = strconv.FormatInt(*targetPool.ActiveHealthCheck.HealthyThreshold, 10)
+		}
+	}
+
+	targets := "-"
+	if targetPool.Targets != nil {
+		var targetsSlice []string
+		for _, target := range *targetPool.Targets {
+			targetStr := fmt.Sprintf("%s (%s)", *target.DisplayName, *target.Ip)
+			targetsSlice = append(targetsSlice, targetStr)
+		}
+		targets = strings.Join(targetsSlice, "\n")
+	}
+
+	listenerStr := "-"
+	if listener != nil {
+		listenerStr = fmt.Sprintf("%s (Port:%d, Protocol: %s)", *listener.Name, *listener.Port, *listener.Protocol)
+	}
+
+	table := tables.NewTable()
+	table.AddRow("NAME", *targetPool.Name)
+	table.AddSeparator()
+	table.AddRow("TARGET PORT", *targetPool.TargetPort)
+	table.AddSeparator()
+	table.AddRow("ATTACHED LISTENER", listenerStr)
+	table.AddSeparator()
+	table.AddRow("TARGETS", targets)
+	table.AddSeparator()
+	table.AddRow("SESSION PERSISTENCE", sessionPersistence)
+	table.AddSeparator()
+	table.AddRow("HEALTH CHECK INTERVAL", healthCheckInterval)
+	table.AddSeparator()
+	table.AddRow("HEALTH CHECK DOWN AFTER", healthCheckUnhealthyThreshold)
+	table.AddSeparator()
+	table.AddRow("HEALTH CHECK UP AFTER", healthCheckHealthyThreshold)
+	table.AddSeparator()
+
+	err := p.PagerDisplay(table.Render())
+	if err != nil {
+		return fmt.Errorf("display output: %w", err)
+	}
+
+	return nil
+}