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