docker/swarmkit

package flagparser

import (
    "errors"
    "time"

    "github.com/moby/swarmkit/v2/api"
    "github.com/spf13/pflag"
)

func parseUpdate(flags *pflag.FlagSet, spec *api.ServiceSpec) error {
    if flags.Changed("update-parallelism") {
        parallelism, err := flags.GetUint64("update-parallelism")
        if err != nil {
            return err
        }
        if spec.Update == nil {
            spec.Update = &api.UpdateConfig{}
        }
        spec.Update.Parallelism = parallelism
    }

    if flags.Changed("update-delay") {
        delay, err := flags.GetString("update-delay")
        if err != nil {
            return err
        }

        delayDuration, err := time.ParseDuration(delay)
        if err != nil {
            return err
        }

        if spec.Update == nil {
            spec.Update = &api.UpdateConfig{}
        }
        spec.Update.Delay = delayDuration
    }

    if flags.Changed("update-on-failure") {
        if spec.Update == nil {
            spec.Update = &api.UpdateConfig{}
        }

        action, err := flags.GetString("update-on-failure")
        if err != nil {
            return err
        }
        switch action {
        case "pause":
            spec.Update.FailureAction = api.UpdateConfig_PAUSE
        case "continue":
            spec.Update.FailureAction = api.UpdateConfig_CONTINUE
        case "rollback":
            spec.Update.FailureAction = api.UpdateConfig_ROLLBACK
        default:
            return errors.New("--update-on-failure value must be pause or continue")
        }
    }

    if flags.Changed("update-order") {
        if spec.Update == nil {
            spec.Update = &api.UpdateConfig{}
        }

        order, err := flags.GetString("update-order")
        if err != nil {
            return err
        }

        switch order {
        case "stop-first":
            spec.Update.Order = api.UpdateConfig_STOP_FIRST
        case "start-first":
            spec.Update.Order = api.UpdateConfig_START_FIRST
        default:
            return errors.New("--update-order value must be stop-first or start-first")
        }
    }

    if flags.Changed("rollback-parallelism") {
        parallelism, err := flags.GetUint64("rollback-parallelism")
        if err != nil {
            return err
        }
        if spec.Rollback == nil {
            spec.Rollback = &api.UpdateConfig{}
        }
        spec.Rollback.Parallelism = parallelism
    }

    if flags.Changed("rollback-delay") {
        delay, err := flags.GetString("rollback-delay")
        if err != nil {
            return err
        }

        delayDuration, err := time.ParseDuration(delay)
        if err != nil {
            return err
        }

        if spec.Rollback == nil {
            spec.Rollback = &api.UpdateConfig{}
        }
        spec.Rollback.Delay = delayDuration
    }

    if flags.Changed("rollback-on-failure") {
        if spec.Rollback == nil {
            spec.Rollback = &api.UpdateConfig{}
        }

        action, err := flags.GetString("rollback-on-failure")
        if err != nil {
            return err
        }
        switch action {
        case "pause":
            spec.Rollback.FailureAction = api.UpdateConfig_PAUSE
        case "continue":
            spec.Rollback.FailureAction = api.UpdateConfig_CONTINUE
        default:
            return errors.New("--rollback-on-failure value must be pause or continue")
        }
    }

    if flags.Changed("rollback-order") {
        if spec.Rollback == nil {
            spec.Rollback = &api.UpdateConfig{}
        }

        order, err := flags.GetString("rollback-order")
        if err != nil {
            return err
        }

        switch order {
        case "stop-first":
            spec.Rollback.Order = api.UpdateConfig_STOP_FIRST
        case "start-first":
            spec.Rollback.Order = api.UpdateConfig_START_FIRST
        default:
            return errors.New("--rollback-order value must be stop-first or start-first")
        }
    }

    return nil
}