mirror of https://github.com/docker/cli.git
93 lines
2.2 KiB
Go
93 lines
2.2 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/docker/api/types"
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"github.com/docker/docker/cli"
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"github.com/docker/docker/cli/command"
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"github.com/spf13/cobra"
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)
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func newScaleCommand(dockerCli *command.DockerCli) *cobra.Command {
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return &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, args)
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},
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}
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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 fmt.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.DockerCli, args []string) error {
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var errors []string
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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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errors = append(errors, 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(dockerCli, serviceID, scale); err != nil {
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errors = append(errors, fmt.Sprintf("%s: %v", serviceID, err))
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}
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}
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if len(errors) == 0 {
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return nil
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}
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return fmt.Errorf(strings.Join(errors, "\n"))
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}
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func runServiceScale(dockerCli *command.DockerCli, serviceID string, scale uint64) error {
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client := dockerCli.Client()
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ctx := context.Background()
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service, _, err := client.ServiceInspectWithRaw(ctx, serviceID)
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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 fmt.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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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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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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