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12a00e6017
As described in our ROADMAP.md, introduce new Swarm management commands to call to the corresponding API endpoints. This PR is fully backward compatible (joining a Swarm is an optional feature of the Engine, and existing commands are not impacted). Signed-off-by: Daniel Nephin <dnephin@docker.com> Signed-off-by: Victor Vieux <vieux@docker.com> Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
86 lines
2.1 KiB
Go
86 lines
2.1 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/client"
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"github.com/docker/docker/cli"
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"github.com/spf13/cobra"
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)
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func newScaleCommand(dockerCli *client.DockerCli) *cobra.Command {
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return &cobra.Command{
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Use: "scale SERVICE=SCALE [SERVICE=SCALE...]",
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Short: "Scale one or multiple 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 *client.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, scale := parts[0], parts[1]
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if err := runServiceScale(dockerCli, serviceID, scale); err != nil {
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errors = append(errors, fmt.Sprintf("%s: %s", serviceID, err.Error()))
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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 *client.DockerCli, serviceID string, scale string) error {
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client := dockerCli.Client()
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ctx := context.Background()
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service, err := client.ServiceInspect(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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uintScale, err := strconv.ParseUint(scale, 10, 64)
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if err != nil {
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return fmt.Errorf("invalid replicas value %s: %s", scale, err.Error())
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}
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serviceMode.Replicated.Replicas = &uintScale
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err = client.ServiceUpdate(ctx, service.ID, service.Version, service.Spec)
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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 %s\n", serviceID, scale)
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return nil
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}
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