docker/swarmkit

package service

import (
    "context"
    "fmt"

    "github.com/moby/swarmkit/v2/api"
)

func getService(ctx context.Context, c api.ControlClient, input string) (*api.Service, error) {
    // GetService to match via full ID.
    rg, err := c.GetService(ctx, &api.GetServiceRequest{ServiceID: input})
    if err != nil {
        // If any error (including NotFound), ListServices to match via full name.
        rl, err := c.ListServices(ctx,
            &api.ListServicesRequest{
                Filters: &api.ListServicesRequest_Filters{
                    Names: []string{input},
                },
            },
        )
        if err != nil {
            return nil, err
        }

        if len(rl.Services) == 0 {
            return nil, fmt.Errorf("service %s not found", input)
        }

        if l := len(rl.Services); l > 1 {
            return nil, fmt.Errorf("service %s is ambiguous (%d matches found)", input, l)
        }

        return rl.Services[0], nil
    }
    return rg.Service, nil
}

func getServiceReplicasTxt(s *api.Service, running int) string {
    switch t := s.Spec.GetMode().(type) {
    case *api.ServiceSpec_Global:
        return "global"
    case *api.ServiceSpec_Replicated:
        return fmt.Sprintf("%d/%d", running, t.Replicated.Replicas)
    }
    return ""
}