128 lines
3.0 KiB
Go
128 lines
3.0 KiB
Go
package command
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import (
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"fmt"
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"strings"
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)
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type NodeDrainCommand struct {
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Meta
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}
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func (c *NodeDrainCommand) Help() string {
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helpText := `
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Usage: nomad node-drain [options] <node>
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Toggles node draining on a specified node. It is required
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that either -enable or -disable is specified, but not both.
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General Options:
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` + generalOptionsUsage() + `
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Node Drain Options:
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-disable
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Disable draining for the specified node.
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-enable
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Enable draining for the specified node.
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`
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return strings.TrimSpace(helpText)
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}
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func (c *NodeDrainCommand) Synopsis() string {
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return "Toggle drain mode on a given node"
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}
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func (c *NodeDrainCommand) Run(args []string) int {
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var enable, disable bool
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flags := c.Meta.FlagSet("node-drain", FlagSetClient)
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flags.Usage = func() { c.Ui.Output(c.Help()) }
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flags.BoolVar(&enable, "enable", false, "Enable drain mode")
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flags.BoolVar(&disable, "disable", false, "Disable drain mode")
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if err := flags.Parse(args); err != nil {
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return 1
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}
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// Check that we got either enable or disable, but not both.
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if (enable && disable) || (!enable && !disable) {
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c.Ui.Error(c.Help())
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return 1
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}
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// Check that we got a node ID
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args = flags.Args()
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if len(args) != 1 {
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c.Ui.Error(c.Help())
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return 1
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}
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nodeID := args[0]
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// Get the HTTP client
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client, err := c.Meta.Client()
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if err != nil {
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c.Ui.Error(fmt.Sprintf("Error initializing client: %s", err))
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return 1
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}
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// Check if node exists
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node, _, err := client.Nodes().Info(nodeID, nil)
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if err != nil {
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if len(nodeID) == 1 {
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c.Ui.Error(fmt.Sprintf("Identifier must contain at least two characters."))
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return 1
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}
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if len(nodeID)%2 == 1 {
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// Identifiers must be of even length, so we strip off the last byte
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// to provide a consistent user experience.
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nodeID = nodeID[:len(nodeID)-1]
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}
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// Exact lookup failed, try with prefix based search
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nodes, _, err := client.Nodes().PrefixList(nodeID)
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if err != nil {
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c.Ui.Error(fmt.Sprintf("Error toggling drain mode: %s", err))
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return 1
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}
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// Return error if no nodes are found
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if len(nodes) == 0 {
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c.Ui.Error(fmt.Sprintf("No node(s) with prefix or id %q found", nodeID))
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return 1
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}
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if len(nodes) > 1 {
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// Format the nodes list that matches the prefix so that the user
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// can create a more specific request
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out := make([]string, len(nodes)+1)
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out[0] = "ID|Datacenter|Name|Class|Drain|Status"
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for i, node := range nodes {
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out[i+1] = fmt.Sprintf("%s|%s|%s|%s|%v|%s",
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node.ID,
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node.Datacenter,
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node.Name,
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node.NodeClass,
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node.Drain,
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node.Status)
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}
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// Dump the output
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c.Ui.Output(fmt.Sprintf("Prefix matched multiple nodes\n\n%s", formatList(out)))
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return 0
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}
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// Prefix lookup matched a single node
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node, _, err = client.Nodes().Info(nodes[0].ID, nil)
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if err != nil {
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c.Ui.Error(fmt.Sprintf("Error toggling drain mode: %s", err))
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return 1
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}
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}
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// Toggle node draining
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if _, err := client.Nodes().ToggleDrain(node.ID, enable, nil); err != nil {
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c.Ui.Error(fmt.Sprintf("Error toggling drain mode: %s", err))
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return 1
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}
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return 0
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}
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