fix: GetService & handling missing services

pkg/container/container.go

@@ -14,8 +14,8 @@ import (
 )
 
 // GetContainer retrieves a container. If prompt is true and the retrievd count
-// of containers does not match expectedN, then a prompt is presented to let
-// the user choose.
+// of containers does not match 1, then a prompt is presented to let the user
+// choose. A count of 0 is handled gracefully.
 func GetContainer(c context.Context, cl *client.Client, filters filters.Args, prompt bool) (types.Container, error) {
 	containerOpts := types.ContainerListOptions{Filters: filters}
 	containers, err := cl.ContainerList(c, containerOpts)

pkg/service/service.go

@@ -0,0 +1,69 @@
+package service
+
+import (
+	"context"
+	"fmt"
+	"strings"
+
+	"coopcloud.tech/abra/pkg/formatter"
+	"github.com/AlecAivazis/survey/v2"
+	"github.com/docker/docker/api/types"
+	"github.com/docker/docker/api/types/filters"
+	"github.com/docker/docker/api/types/swarm"
+	"github.com/docker/docker/client"
+	"github.com/sirupsen/logrus"
+)
+
+// GetService retrieves a service container. If prompt is true and the retrievd
+// count of service containers does not match 1, then a prompt is presented to
+// let the user choose. A count of 0 is handled gracefully.
+func GetService(c context.Context, cl *client.Client, filters filters.Args, prompt bool) (swarm.Service, error) {
+	serviceOpts := types.ServiceListOptions{Filters: filters}
+	services, err := cl.ServiceList(c, serviceOpts)
+	if err != nil {
+		return swarm.Service{}, err
+	}
+
+	if len(services) == 0 {
+		filter := filters.Get("name")[0]
+		return swarm.Service{}, fmt.Errorf("no services matching the %v filter found?", filter)
+	}
+
+	if len(services) != 1 {
+		var servicesRaw []string
+		for _, service := range services {
+			serviceName := service.Spec.Name
+			created := formatter.HumanDuration(service.CreatedAt.Unix())
+			servicesRaw = append(servicesRaw, fmt.Sprintf("%s (created %v)", serviceName, created))
+		}
+
+		if !prompt {
+			err := fmt.Errorf("expected 1 service but found %v: %s", len(services), strings.Join(servicesRaw, " "))
+			return swarm.Service{}, err
+		}
+
+		logrus.Warnf("ambiguous service list received, prompting for input")
+
+		var response string
+		prompt := &survey.Select{
+			Message: "which service are you looking for?",
+			Options: servicesRaw,
+		}
+
+		if err := survey.AskOne(prompt, &response); err != nil {
+			return swarm.Service{}, err
+		}
+
+		chosenService := strings.TrimSpace(strings.Split(response, " ")[0])
+		for _, service := range services {
+			serviceName := strings.ToLower(service.Spec.Name)
+			if serviceName == chosenService {
+				return service, nil
+			}
+		}
+
+		logrus.Panic("failed to match chosen service")
+	}
+
+	return services[0], nil
+}