mirror of https://github.com/docker/cli.git
124 lines
3.0 KiB
Go
124 lines
3.0 KiB
Go
package service
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import (
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"fmt"
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"strconv"
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"strings"
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"golang.org/x/net/context"
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"github.com/docker/cli/cli"
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"github.com/docker/cli/cli/command"
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"github.com/docker/docker/api/types"
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"github.com/docker/docker/api/types/versions"
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"github.com/pkg/errors"
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"github.com/spf13/cobra"
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)
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type scaleOptions struct {
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detach bool
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}
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func newScaleCommand(dockerCli command.Cli) *cobra.Command {
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options := &scaleOptions{}
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cmd := &cobra.Command{
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Use: "scale SERVICE=REPLICAS [SERVICE=REPLICAS...]",
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Short: "Scale one or multiple replicated services",
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Args: scaleArgs,
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RunE: func(cmd *cobra.Command, args []string) error {
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return runScale(dockerCli, options, args)
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},
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}
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flags := cmd.Flags()
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addDetachFlag(flags, &options.detach)
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return cmd
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}
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func scaleArgs(cmd *cobra.Command, args []string) error {
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if err := cli.RequiresMinArgs(1)(cmd, args); err != nil {
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return err
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}
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for _, arg := range args {
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if parts := strings.SplitN(arg, "=", 2); len(parts) != 2 {
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return errors.Errorf(
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"Invalid scale specifier '%s'.\nSee '%s --help'.\n\nUsage: %s\n\n%s",
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arg,
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cmd.CommandPath(),
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cmd.UseLine(),
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cmd.Short,
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)
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}
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}
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return nil
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}
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func runScale(dockerCli command.Cli, options *scaleOptions, args []string) error {
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var errs []string
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var serviceIDs []string
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ctx := context.Background()
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for _, arg := range args {
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parts := strings.SplitN(arg, "=", 2)
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serviceID, scaleStr := parts[0], parts[1]
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// validate input arg scale number
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scale, err := strconv.ParseUint(scaleStr, 10, 64)
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if err != nil {
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errs = append(errs, fmt.Sprintf("%s: invalid replicas value %s: %v", serviceID, scaleStr, err))
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continue
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}
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if err := runServiceScale(ctx, dockerCli, serviceID, scale); err != nil {
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errs = append(errs, fmt.Sprintf("%s: %v", serviceID, err))
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} else {
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serviceIDs = append(serviceIDs, serviceID)
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}
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}
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if len(serviceIDs) > 0 {
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if !options.detach && versions.GreaterThanOrEqualTo(dockerCli.Client().ClientVersion(), "1.29") {
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for _, serviceID := range serviceIDs {
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if err := waitOnService(ctx, dockerCli, serviceID, false); err != nil {
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errs = append(errs, fmt.Sprintf("%s: %v", serviceID, err))
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}
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}
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}
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}
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if len(errs) == 0 {
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return nil
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}
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return errors.Errorf(strings.Join(errs, "\n"))
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}
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func runServiceScale(ctx context.Context, dockerCli command.Cli, serviceID string, scale uint64) error {
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client := dockerCli.Client()
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service, _, err := client.ServiceInspectWithRaw(ctx, serviceID, types.ServiceInspectOptions{})
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if err != nil {
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return err
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}
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serviceMode := &service.Spec.Mode
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if serviceMode.Replicated == nil {
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return errors.Errorf("scale can only be used with replicated mode")
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}
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serviceMode.Replicated.Replicas = &scale
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response, err := client.ServiceUpdate(ctx, service.ID, service.Version, service.Spec, types.ServiceUpdateOptions{})
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if err != nil {
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return err
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}
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for _, warning := range response.Warnings {
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fmt.Fprintln(dockerCli.Err(), warning)
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}
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fmt.Fprintf(dockerCli.Out(), "%s scaled to %d\n", serviceID, scale)
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return nil
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}
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