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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 <[email protected]> Signed-off-by: Victor Vieux <[email protected]> Signed-off-by: Tonis Tiigi <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,70 @@ | ||
| package idresolver | ||
|
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| import ( | ||
| "fmt" | ||
|
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| "golang.org/x/net/context" | ||
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| "github.com/docker/engine-api/client" | ||
| "github.com/docker/engine-api/types/swarm" | ||
| ) | ||
|
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| // IDResolver provides ID to Name resolution. | ||
| type IDResolver struct { | ||
| client client.APIClient | ||
| noResolve bool | ||
| cache map[string]string | ||
| } | ||
|
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| // New creates a new IDResolver. | ||
| func New(client client.APIClient, noResolve bool) *IDResolver { | ||
| return &IDResolver{ | ||
| client: client, | ||
| noResolve: noResolve, | ||
| cache: make(map[string]string), | ||
| } | ||
| } | ||
|
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| func (r *IDResolver) get(ctx context.Context, t interface{}, id string) (string, error) { | ||
| switch t.(type) { | ||
| case swarm.Node: | ||
| node, err := r.client.NodeInspect(ctx, id) | ||
| if err != nil { | ||
| return id, nil | ||
| } | ||
| if node.Spec.Annotations.Name != "" { | ||
| return node.Spec.Annotations.Name, nil | ||
| } | ||
| if node.Description.Hostname != "" { | ||
| return node.Description.Hostname, nil | ||
| } | ||
| return id, nil | ||
| case swarm.Service: | ||
| service, err := r.client.ServiceInspect(ctx, id) | ||
| if err != nil { | ||
| return id, nil | ||
| } | ||
| return service.Spec.Annotations.Name, nil | ||
| default: | ||
| return "", fmt.Errorf("unsupported type") | ||
| } | ||
|
|
||
| } | ||
|
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| // Resolve will attempt to resolve an ID to a Name by querying the manager. | ||
| // Results are stored into a cache. | ||
| // If the `-n` flag is used in the command-line, resolution is disabled. | ||
| func (r *IDResolver) Resolve(ctx context.Context, t interface{}, id string) (string, error) { | ||
| if r.noResolve { | ||
| return id, nil | ||
| } | ||
| if name, ok := r.cache[id]; ok { | ||
| return name, nil | ||
| } | ||
| name, err := r.get(ctx, t, id) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| r.cache[id] = name | ||
| return name, nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,40 @@ | ||
| package node | ||
|
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| import ( | ||
| "fmt" | ||
|
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| "github.com/docker/docker/api/client" | ||
| "github.com/docker/docker/cli" | ||
| "github.com/docker/engine-api/types/swarm" | ||
| "github.com/spf13/cobra" | ||
| "github.com/spf13/pflag" | ||
| ) | ||
|
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| func newAcceptCommand(dockerCli *client.DockerCli) *cobra.Command { | ||
| var flags *pflag.FlagSet | ||
|
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| cmd := &cobra.Command{ | ||
| Use: "accept NODE [NODE...]", | ||
| Short: "Accept a node in the swarm", | ||
| Args: cli.RequiresMinArgs(1), | ||
| RunE: func(cmd *cobra.Command, args []string) error { | ||
| return runAccept(dockerCli, flags, args) | ||
| }, | ||
| } | ||
|
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| flags = cmd.Flags() | ||
| return cmd | ||
| } | ||
|
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| func runAccept(dockerCli *client.DockerCli, flags *pflag.FlagSet, args []string) error { | ||
| for _, id := range args { | ||
| if err := runUpdate(dockerCli, id, func(node *swarm.Node) { | ||
| node.Spec.Membership = swarm.NodeMembershipAccepted | ||
| }); err != nil { | ||
| return err | ||
| } | ||
| fmt.Println(id, "attempting to accept a node in the swarm.") | ||
| } | ||
|
|
||
| return nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,49 @@ | ||
| package node | ||
|
|
||
| import ( | ||
| "fmt" | ||
|
|
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| "golang.org/x/net/context" | ||
|
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| "github.com/spf13/cobra" | ||
|
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| "github.com/docker/docker/api/client" | ||
| "github.com/docker/docker/cli" | ||
| apiclient "github.com/docker/engine-api/client" | ||
| ) | ||
|
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| // NewNodeCommand returns a cobra command for `node` subcommands | ||
| func NewNodeCommand(dockerCli *client.DockerCli) *cobra.Command { | ||
| cmd := &cobra.Command{ | ||
| Use: "node", | ||
| Short: "Manage docker swarm nodes", | ||
| Args: cli.NoArgs, | ||
| Run: func(cmd *cobra.Command, args []string) { | ||
| fmt.Fprintf(dockerCli.Err(), "\n"+cmd.UsageString()) | ||
| }, | ||
| } | ||
| cmd.AddCommand( | ||
| newAcceptCommand(dockerCli), | ||
| newDemoteCommand(dockerCli), | ||
| newInspectCommand(dockerCli), | ||
| newListCommand(dockerCli), | ||
| newPromoteCommand(dockerCli), | ||
| newRemoveCommand(dockerCli), | ||
| newTasksCommand(dockerCli), | ||
| newUpdateCommand(dockerCli), | ||
| ) | ||
| return cmd | ||
| } | ||
|
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| func nodeReference(client apiclient.APIClient, ctx context.Context, ref string) (string, error) { | ||
| // The special value "self" for a node reference is mapped to the current | ||
| // node, hence the node ID is retrieved using the `/info` endpoint. | ||
| if ref == "self" { | ||
| info, err := client.Info(ctx) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| return info.Swarm.NodeID, nil | ||
| } | ||
| return ref, nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,40 @@ | ||
| package node | ||
|
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| import ( | ||
| "fmt" | ||
|
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| "github.com/docker/docker/api/client" | ||
| "github.com/docker/docker/cli" | ||
| "github.com/docker/engine-api/types/swarm" | ||
| "github.com/spf13/cobra" | ||
| "github.com/spf13/pflag" | ||
| ) | ||
|
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| func newDemoteCommand(dockerCli *client.DockerCli) *cobra.Command { | ||
| var flags *pflag.FlagSet | ||
|
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| cmd := &cobra.Command{ | ||
| Use: "demote NODE [NODE...]", | ||
| Short: "Demote a node from manager in the swarm", | ||
| Args: cli.RequiresMinArgs(1), | ||
| RunE: func(cmd *cobra.Command, args []string) error { | ||
| return runDemote(dockerCli, flags, args) | ||
| }, | ||
| } | ||
|
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| flags = cmd.Flags() | ||
| return cmd | ||
| } | ||
|
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| func runDemote(dockerCli *client.DockerCli, flags *pflag.FlagSet, args []string) error { | ||
| for _, id := range args { | ||
| if err := runUpdate(dockerCli, id, func(node *swarm.Node) { | ||
| node.Spec.Role = swarm.NodeRoleWorker | ||
| }); err != nil { | ||
| return err | ||
| } | ||
| fmt.Println(id, "attempting to demote a manager in the swarm.") | ||
| } | ||
|
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| return nil | ||
| } |
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