cli: Add nomad job allocs command

.changelog/11242.txt

@@ -0,0 +1,3 @@
+```release-note:improvement
+cli: Add `nomad job allocs` command
+```

command/commands.go

@@ -297,6 +297,11 @@ func Commands(metaPtr *Meta, agentUi cli.Ui) map[string]cli.CommandFactory {
 				Meta: meta,
 			}, nil
 		},
+		"job allocs": func() (cli.Command, error) {
+			return &JobAllocsCommand{
+				Meta: meta,
+			}, nil
+		},
 		"job deployments": func() (cli.Command, error) {
 			return &JobDeploymentsCommand{
 				Meta: meta,

command/job_allocs.go

@@ -0,0 +1,159 @@
+package command
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/hashicorp/nomad/api"
+	"github.com/hashicorp/nomad/api/contexts"
+	"github.com/posener/complete"
+)
+
+type JobAllocsCommand struct {
+	Meta
+}
+
+func (c *JobAllocsCommand) Help() string {
+	helpText := `
+Usage: nomad job allocs [options] <job>
+
+  Display allocations for a particular job.
+
+  When ACLs are enabled, this command requires a token with the 'read-job' and
+  'list-jobs' capabilities for the job's namespace.
+
+General Options:
+
+  ` + generalOptionsUsage(usageOptsDefault) + `
+
+Allocs Options:
+
+  -all
+    Display all allocations matching the job ID, even those from an older
+    instance of the job.
+
+  -json
+    Output the allocations in a JSON format.
+
+  -t
+    Format and display allocations using a Go template.
+
+  -verbose
+    Display full information.
+`
+	return strings.TrimSpace(helpText)
+}
+
+func (c *JobAllocsCommand) Synopsis() string {
+	return "List allocations for a job"
+}
+
+func (c *JobAllocsCommand) AutocompleteFlags() complete.Flags {
+	return mergeAutocompleteFlags(c.Meta.AutocompleteFlags(FlagSetClient),
+		complete.Flags{
+			"-json":    complete.PredictNothing,
+			"-t":       complete.PredictAnything,
+			"-verbose": complete.PredictNothing,
+			"-all":     complete.PredictNothing,
+		})
+}
+
+func (c *JobAllocsCommand) AutocompleteArgs() complete.Predictor {
+	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.Jobs, nil)
+		if err != nil {
+			return []string{}
+		}
+		return resp.Matches[contexts.Jobs]
+	})
+}
+
+func (c *JobAllocsCommand) Name() string { return "job allocations" }
+
+func (c *JobAllocsCommand) Run(args []string) int {
+	var json, verbose, all bool
+	var tmpl string
+
+	flags := c.Meta.FlagSet(c.Name(), FlagSetClient)
+	flags.Usage = func() { c.Ui.Output(c.Help()) }
+	flags.BoolVar(&verbose, "verbose", false, "")
+	flags.BoolVar(&all, "all", false, "")
+	flags.BoolVar(&json, "json", false, "")
+	flags.StringVar(&tmpl, "t", "", "")
+
+	if err := flags.Parse(args); err != nil {
+		return 1
+	}
+
+	// Check that we got exactly one job
+	args = flags.Args()
+	if len(args) != 1 {
+		c.Ui.Error("This command takes one argument: <job>")
+		c.Ui.Error(commandErrorText(c))
+		return 1
+	}
+
+	// Get the HTTP client
+	client, err := c.Meta.Client()
+	if err != nil {
+		c.Ui.Error(fmt.Sprintf("Error initializing client: %s", err))
+		return 1
+	}
+
+	jobID := strings.TrimSpace(args[0])
+
+	// Check if the job exists
+	jobs, _, err := client.Jobs().PrefixList(jobID)
+	if err != nil {
+		c.Ui.Error(fmt.Sprintf("Error listing jobs: %s", err))
+		return 1
+	}
+	if len(jobs) == 0 {
+		c.Ui.Error(fmt.Sprintf("No job(s) with prefix or id %q found", jobID))
+		return 1
+	}
+	if len(jobs) > 1 {
+		if jobID != jobs[0].ID {
+			c.Ui.Error(fmt.Sprintf("Prefix matched multiple jobs\n\n%s", createStatusListOutput(jobs, c.allNamespaces())))
+			return 1
+		}
+		if c.allNamespaces() && jobs[0].ID == jobs[1].ID {
+			c.Ui.Error(fmt.Sprintf("Prefix matched multiple jobs\n\n%s", createStatusListOutput(jobs, c.allNamespaces())))
+			return 1
+		}
+	}
+
+	jobID = jobs[0].ID
+	q := &api.QueryOptions{Namespace: jobs[0].JobSummary.Namespace}
+
+	allocs, _, err := client.Jobs().Allocations(jobID, all, q)
+	if err != nil {
+		c.Ui.Error(fmt.Sprintf("Error retrieving allocations: %s", err))
+		return 1
+	}
+
+	if json || len(tmpl) > 0 {
+		out, err := Format(json, tmpl, allocs)
+		if err != nil {
+			c.Ui.Error(err.Error())
+			return 1
+		}
+
+		c.Ui.Output(out)
+		return 0
+	}
+
+	// Truncate the id unless full length is requested
+	length := shortId
+	if verbose {
+		length = fullId
+	}
+
+	c.Ui.Output(formatAllocListStubs(allocs, verbose, length))
+	return 0
+}

command/job_allocs_test.go

@@ -0,0 +1,174 @@
+package command
+
+import (
+	"testing"
+
+	"github.com/hashicorp/nomad/nomad/structs"
+
+	"github.com/hashicorp/nomad/nomad/mock"
+	"github.com/mitchellh/cli"
+	"github.com/posener/complete"
+	"github.com/stretchr/testify/require"
+)
+
+func TestJobAllocsCommand_Implements(t *testing.T) {
+	t.Parallel()
+	var _ cli.Command = &JobAllocsCommand{}
+}
+
+func TestJobAllocsCommand_Fails(t *testing.T) {
+	t.Parallel()
+	srv, _, url := testServer(t, true, nil)
+	defer srv.Shutdown()
+
+	ui := cli.NewMockUi()
+	cmd := &JobAllocsCommand{Meta: Meta{Ui: ui}}
+
+	// Fails on misuse
+	code := cmd.Run([]string{"some", "bad", "args"})
+	outerr := ui.ErrorWriter.String()
+	require.Equalf(t, 1, code, "expected exit code 1, got: %d", code)
+	require.Containsf(t, outerr, commandErrorText(cmd), "expected help output, got: %s", outerr)
+
+	ui.ErrorWriter.Reset()
+
+	// Bad address
+	code = cmd.Run([]string{"-address=nope", "foo"})
+	outerr = ui.ErrorWriter.String()
+	require.Equalf(t, 1, code, "expected exit code 1, got: %d", code)
+	require.Containsf(t, outerr, "Error listing jobs", "expected failed query error, got: %s", outerr)
+
+	ui.ErrorWriter.Reset()
+
+	// Bad job name
+	code = cmd.Run([]string{"-address=" + url, "foo"})
+	outerr = ui.ErrorWriter.String()
+	require.Equalf(t, 1, code, "expected exit 1, got: %d", code)
+	require.Containsf(t, outerr, "No job(s) with prefix or id \"foo\" found", "expected no job found, got: %s", outerr)
+
+	ui.ErrorWriter.Reset()
+}
+
+func TestJobAllocsCommand_Run(t *testing.T) {
+	t.Parallel()
+	srv, _, url := testServer(t, true, nil)
+	defer srv.Shutdown()
+
+	ui := cli.NewMockUi()
+	cmd := &JobAllocsCommand{Meta: Meta{Ui: ui}}
+
+	// Create a job without an allocation
+	job := mock.Job()
+	state := srv.Agent.Server().State()
+	require.Nil(t, state.UpsertJob(structs.MsgTypeTestSetup, 100, job))
+
+	// Should display no match if the job doesn't have allocations
+	code := cmd.Run([]string{"-address=" + url, job.ID})
+	out := ui.OutputWriter.String()
+	require.Equalf(t, 0, code, "expected exit 0, got: %d", code)
+	require.Containsf(t, out, "No allocations placed", "expected no allocations placed, got: %s", out)
+
+	ui.OutputWriter.Reset()
+
+	// Inject an allocation
+	a := mock.Alloc()
+	a.Job = job
+	a.JobID = job.ID
+	a.TaskGroup = job.TaskGroups[0].Name
+	a.Metrics = &structs.AllocMetric{}
+	a.DesiredStatus = structs.AllocDesiredStatusRun
+	a.ClientStatus = structs.AllocClientStatusRunning
+	require.Nil(t, state.UpsertAllocs(structs.MsgTypeTestSetup, 200, []*structs.Allocation{a}))
+
+	// Should now display the alloc
+	code = cmd.Run([]string{"-address=" + url, "-verbose", job.ID})
+	out = ui.OutputWriter.String()
+	outerr := ui.ErrorWriter.String()
+	require.Equalf(t, 0, code, "expected exit 0, got: %d", code)
+	require.Emptyf(t, outerr, "expected no error output, got: \n\n%s", outerr)
+	require.Containsf(t, out, a.ID, "expected alloc output, got: %s", out)
+
+	ui.OutputWriter.Reset()
+	ui.ErrorWriter.Reset()
+}
+
+func TestJobAllocsCommand_Template(t *testing.T) {
+	t.Parallel()
+	srv, _, url := testServer(t, true, nil)
+	defer srv.Shutdown()
+
+	ui := cli.NewMockUi()
+	cmd := &JobAllocsCommand{Meta: Meta{Ui: ui}}
+
+	// Create a job
+	job := mock.Job()
+	state := srv.Agent.Server().State()
+	require.Nil(t, state.UpsertJob(structs.MsgTypeTestSetup, 100, job))
+
+	// Inject a running allocation
+	a := mock.Alloc()
+	a.Job = job
+	a.JobID = job.ID
+	a.TaskGroup = job.TaskGroups[0].Name
+	a.Metrics = &structs.AllocMetric{}
+	a.DesiredStatus = structs.AllocDesiredStatusRun
+	a.ClientStatus = structs.AllocClientStatusRunning
+	require.Nil(t, state.UpsertAllocs(structs.MsgTypeTestSetup, 200, []*structs.Allocation{a}))
+
+	// Inject a pending allocation
+	b := mock.Alloc()
+	b.Job = job
+	b.JobID = job.ID
+	b.TaskGroup = job.TaskGroups[0].Name
+	b.Metrics = &structs.AllocMetric{}
+	b.DesiredStatus = structs.AllocDesiredStatusRun
+	b.ClientStatus = structs.AllocClientStatusPending
+	require.Nil(t, state.UpsertAllocs(structs.MsgTypeTestSetup, 300, []*structs.Allocation{b}))
+
+	// Should display an AllocacitonListStub object
+	code := cmd.Run([]string{"-address=" + url, "-t", "'{{printf \"%#+v\" .}}'", job.ID})
+	out := ui.OutputWriter.String()
+	outerr := ui.ErrorWriter.String()
+
+	require.Equalf(t, 0, code, "expected exit 0, got: %d", code)
+	require.Emptyf(t, outerr, "expected no error output, got: \n\n%s", outerr)
+	require.Containsf(t, out, "api.AllocationListStub", "expected alloc output, got: %s", out)
+
+	ui.OutputWriter.Reset()
+	ui.ErrorWriter.Reset()
+
+	// Should display only the running allocation ID
+	code = cmd.Run([]string{"-address=" + url, "-t", "'{{ range . }}{{ if eq .ClientStatus \"running\" }}{{ println .ID }}{{ end }}{{ end }}'", job.ID})
+	out = ui.OutputWriter.String()
+	outerr = ui.ErrorWriter.String()
+
+	require.Equalf(t, 0, code, "expected exit 0, got: %d", code)
+	require.Emptyf(t, outerr, "expected no error output, got: \n\n%s", outerr)
+	require.Containsf(t, out, a.ID, "expected ID of alloc a, got: %s", out)
+	require.NotContainsf(t, out, b.ID, "should not contain ID of alloc b, got: %s", out)
+
+	ui.OutputWriter.Reset()
+	ui.ErrorWriter.Reset()
+}
+
+func TestJobAllocsCommand_AutocompleteArgs(t *testing.T) {
+	t.Parallel()
+	srv, _, url := testServer(t, true, nil)
+	defer srv.Shutdown()
+
+	ui := cli.NewMockUi()
+	cmd := &JobAllocsCommand{Meta: Meta{Ui: ui, flagAddress: url}}
+
+	// Create a fake job
+	state := srv.Agent.Server().State()
+	j := mock.Job()
+	require.Nil(t, state.UpsertJob(structs.MsgTypeTestSetup, 1000, j))
+
+	prefix := j.ID[:len(j.ID)-5]
+	args := complete.Args{Last: prefix}
+	predictor := cmd.AutocompleteArgs()
+
+	res := predictor.Predict(args)
+	require.Equal(t, 1, len(res))
+	require.Equal(t, j.ID, res[0])
+}