1package command
2
3import (
4	"fmt"
5	"strings"
6
7	"github.com/hashicorp/nomad/api"
8	"github.com/hashicorp/nomad/api/contexts"
9	"github.com/posener/complete"
10)
11
12type AllocRestartCommand struct {
13	Meta
14}
15
16func (a *AllocRestartCommand) Help() string {
17	helpText := `
18Usage: nomad alloc restart [options] <allocation> <task>
19
20  restart an existing allocation. This command is used to restart a specific alloc
21  and its tasks. If no task is provided then all of the allocation's tasks will
22  be restarted.
23
24General Options:
25
26  ` + generalOptionsUsage() + `
27
28Restart Specific Options:
29
30  -verbose
31    Show full information.
32`
33	return strings.TrimSpace(helpText)
34}
35
36func (c *AllocRestartCommand) Name() string { return "alloc restart" }
37
38func (c *AllocRestartCommand) Run(args []string) int {
39	var verbose bool
40
41	flags := c.Meta.FlagSet(c.Name(), FlagSetClient)
42	flags.Usage = func() { c.Ui.Output(c.Help()) }
43	flags.BoolVar(&verbose, "verbose", false, "")
44
45	if err := flags.Parse(args); err != nil {
46		return 1
47	}
48
49	// Check that we got exactly one alloc
50	args = flags.Args()
51	if len(args) < 1 || len(args) > 2 {
52		c.Ui.Error("This command takes one or two arguments: <alloc-id> <task-name>")
53		c.Ui.Error(commandErrorText(c))
54		return 1
55	}
56
57	allocID := args[0]
58
59	// Truncate the id unless full length is requested
60	length := shortId
61	if verbose {
62		length = fullId
63	}
64
65	// Query the allocation info
66	if len(allocID) == 1 {
67		c.Ui.Error(fmt.Sprintf("Alloc ID must contain at least two characters."))
68		return 1
69	}
70
71	allocID = sanitizeUUIDPrefix(allocID)
72
73	// Get the HTTP client
74	client, err := c.Meta.Client()
75	if err != nil {
76		c.Ui.Error(fmt.Sprintf("Error initializing client: %s", err))
77		return 1
78	}
79
80	allocs, _, err := client.Allocations().PrefixList(allocID)
81	if err != nil {
82		c.Ui.Error(fmt.Sprintf("Error querying allocation: %v", err))
83		return 1
84	}
85
86	if len(allocs) == 0 {
87		c.Ui.Error(fmt.Sprintf("No allocation(s) with prefix or id %q found", allocID))
88		return 1
89	}
90
91	if len(allocs) > 1 {
92		// Format the allocs
93		out := formatAllocListStubs(allocs, verbose, length)
94		c.Ui.Error(fmt.Sprintf("Prefix matched multiple allocations\n\n%s", out))
95		return 1
96	}
97
98	// Prefix lookup matched a single allocation
99	alloc, _, err := client.Allocations().Info(allocs[0].ID, nil)
100	if err != nil {
101		c.Ui.Error(fmt.Sprintf("Error querying allocation: %s", err))
102		return 1
103	}
104
105	var taskName string
106	if len(args) == 2 {
107		// Validate Task
108		taskName = args[1]
109		err := validateTaskExistsInAllocation(taskName, alloc)
110		if err != nil {
111			c.Ui.Error(err.Error())
112			return 1
113		}
114	}
115
116	err = client.Allocations().Restart(alloc, taskName, nil)
117	if err != nil {
118		c.Ui.Error(fmt.Sprintf("Failed to restart allocation:\n\n%s", err.Error()))
119		return 1
120	}
121
122	return 0
123}
124
125func validateTaskExistsInAllocation(taskName string, alloc *api.Allocation) error {
126	tg := alloc.Job.LookupTaskGroup(alloc.TaskGroup)
127	if tg == nil {
128		return fmt.Errorf("Could not find allocation task group: %s", alloc.TaskGroup)
129	}
130
131	foundTaskNames := make([]string, len(tg.Tasks))
132	for i, task := range tg.Tasks {
133		foundTaskNames[i] = task.Name
134		if task.Name == taskName {
135			return nil
136		}
137	}
138
139	return fmt.Errorf("Could not find task named: %s, found:\n%s", taskName, formatList(foundTaskNames))
140}
141
142func (a *AllocRestartCommand) Synopsis() string {
143	return "Restart a running allocation"
144}
145
146func (c *AllocRestartCommand) AutocompleteArgs() complete.Predictor {
147	// Here we attempt to autocomplete allocations for any position of arg.
148	// We should eventually try to auto complete the task name if the arg is
149	// at position 2.
150	return complete.PredictFunc(func(a complete.Args) []string {
151		client, err := c.Meta.Client()
152		if err != nil {
153			return nil
154		}
155
156		resp, _, err := client.Search().PrefixSearch(a.Last, contexts.Allocs, nil)
157		if err != nil {
158			return []string{}
159		}
160		return resp.Matches[contexts.Allocs]
161	})
162}
163