164 lines
4 KiB
Go
164 lines
4 KiB
Go
package command
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import (
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"fmt"
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"strings"
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"github.com/hashicorp/nomad/api"
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"github.com/hashicorp/nomad/api/contexts"
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"github.com/posener/complete"
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)
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type AllocSignalCommand struct {
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Meta
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}
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func (a *AllocSignalCommand) Help() string {
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helpText := `
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Usage: nomad alloc signal [options] <signal> <allocation> <task>
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signal an existing allocation. This command is used to signal a specific alloc
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and its subtasks. If no task is provided then all of the allocations subtasks
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will receive the signal.
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When ACLs are enabled, this command requires a token with the
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'alloc-lifecycle', 'read-job', and 'list-jobs' capabilities for the
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allocation's namespace.
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General Options:
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` + generalOptionsUsage(usageOptsDefault) + `
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Signal Specific Options:
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-s
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Specify the signal that the selected tasks should receive.
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-verbose
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Show full information.
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`
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return strings.TrimSpace(helpText)
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}
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func (c *AllocSignalCommand) Name() string { return "alloc signal" }
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func (c *AllocSignalCommand) Run(args []string) int {
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var verbose bool
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var signal string
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flags := c.Meta.FlagSet(c.Name(), FlagSetClient)
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flags.Usage = func() { c.Ui.Output(c.Help()) }
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flags.BoolVar(&verbose, "verbose", false, "")
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flags.StringVar(&signal, "s", "SIGKILL", "")
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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 exactly one alloc
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args = flags.Args()
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if len(args) < 1 || len(args) > 2 {
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c.Ui.Error("This command takes up to two arguments: <alloc-id> <task>")
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c.Ui.Error(commandErrorText(c))
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return 1
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}
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allocID := args[0]
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// Truncate the id unless full length is requested
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length := shortId
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if verbose {
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length = fullId
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}
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// Query the allocation info
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if len(allocID) == 1 {
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c.Ui.Error(fmt.Sprintf("Alloc ID must contain at least two characters."))
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return 1
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}
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allocID = sanitizeUUIDPrefix(allocID)
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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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allocs, _, err := client.Allocations().PrefixList(allocID)
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if err != nil {
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c.Ui.Error(fmt.Sprintf("Error querying allocation: %v", err))
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return 1
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}
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if len(allocs) == 0 {
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c.Ui.Error(fmt.Sprintf("No allocation(s) with prefix or id %q found", allocID))
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return 1
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}
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if len(allocs) > 1 {
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// Format the allocs
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out := formatAllocListStubs(allocs, verbose, length)
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c.Ui.Error(fmt.Sprintf("Prefix matched multiple allocations\n\n%s", out))
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return 1
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}
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// Prefix lookup matched a single allocation
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q := &api.QueryOptions{Namespace: allocs[0].Namespace}
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alloc, _, err := client.Allocations().Info(allocs[0].ID, q)
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if err != nil {
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c.Ui.Error(fmt.Sprintf("Error querying allocation: %s", err))
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return 1
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}
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var taskName string
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if len(args) == 2 {
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// Validate Task
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taskName = args[1]
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err := validateTaskExistsInAllocation(taskName, alloc)
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if err != nil {
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c.Ui.Error(err.Error())
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return 1
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}
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}
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err = client.Allocations().Signal(alloc, nil, taskName, signal)
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if err != nil {
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c.Ui.Error(fmt.Sprintf("Error signalling allocation: %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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func (a *AllocSignalCommand) Synopsis() string {
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return "Signal a running allocation"
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}
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func (c *AllocSignalCommand) AutocompleteFlags() complete.Flags {
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return mergeAutocompleteFlags(c.Meta.AutocompleteFlags(FlagSetClient),
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complete.Flags{
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"-s": complete.PredictNothing,
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"-verbose": complete.PredictNothing,
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})
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}
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func (c *AllocSignalCommand) AutocompleteArgs() complete.Predictor {
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// Here we only autocomplete allocation names. Eventually we may consider
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// expanding this to also autocomplete task names. To do so, we'll need to
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// either change the autocompletion api, or implement parsing such that we can
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// easily compute the current arg position.
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return complete.PredictFunc(func(a complete.Args) []string {
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client, err := c.Meta.Client()
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if err != nil {
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return nil
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}
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resp, _, err := client.Search().PrefixSearch(a.Last, contexts.Allocs, nil)
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if err != nil {
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return []string{}
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}
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return resp.Matches[contexts.Allocs]
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})
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}
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