command: adding eval-monitor

command/eval_monitor.go

@@ -0,0 +1,72 @@
+package command
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/mitchellh/cli"
+)
+
+type EvalMonitorCommand struct {
+	Meta
+}
+
+func (c *EvalMonitorCommand) Help() string {
+	helpText := `
+Usage: nomad eval-monitor [options] <evaluation>
+
+  Start an interactive monitoring session for an existing evaluation.
+  The monitor command periodically polls for information about the
+  provided evaluation, including status updates, new allocations,
+  updates to allocations, and failures. Status is printed in near
+  real-time to the terminal.
+
+  The command will exit when the given evaluation reaches a terminal
+  state (completed or failed). The exit status will reflect the
+  result of the evaluation (0 on success, 1 on failure). Exit code
+  1 may also be encountered for client connectivity errors.
+
+General Options:
+
+  ` + generalOptionsUsage()
+	return strings.TrimSpace(helpText)
+}
+
+func (c *EvalMonitorCommand) Synopsis() string {
+	return "Monitor an evaluation interactively"
+}
+
+func (c *EvalMonitorCommand) Run(args []string) int {
+	// Set up the prefixed output
+	c.Ui = &cli.PrefixedUi{
+		InfoPrefix:   "==> ",
+		OutputPrefix: "    ",
+		ErrorPrefix:  "==> ",
+		Ui:           c.Ui,
+	}
+
+	flags := c.Meta.FlagSet("eval-monitor", FlagSetClient)
+	flags.Usage = func() { c.Ui.Output(c.Help()) }
+	if err := flags.Parse(args); err != nil {
+		return 1
+	}
+
+	// Check that we got exactly one eval ID
+	args = flags.Args()
+	if len(args) != 1 {
+		c.Ui.Error(c.Help())
+		return 1
+	}
+	evalID := args[0]
+
+	// Get the HTTP client
+	client, err := c.Meta.Client()
+	if err != nil {
+		c.Ui.Error(fmt.Sprintf("Error initializing client: %s", err))
+		return 1
+	}
+
+	// Start monitoring
+	mon := newMonitor(c.Ui, client)
+	return mon.monitor(evalID)
+}

command/eval_monitor_test.go

@@ -0,0 +1,46 @@
+package command
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/mitchellh/cli"
+)
+
+func TestEvalMonitorCommand_Implements(t *testing.T) {
+	var _ cli.Command = &EvalMonitorCommand{}
+}
+
+func TestEvalMonitorCommand_Fails(t *testing.T) {
+	srv, _, url := testServer(t, nil)
+	defer srv.Stop()
+
+	ui := new(cli.MockUi)
+	cmd := &EvalMonitorCommand{Meta: Meta{Ui: ui}}
+
+	// Fails on misuse
+	if code := cmd.Run([]string{"some", "bad", "args"}); code != 1 {
+		t.Fatalf("expected exit code 1, got: %d", code)
+	}
+	if out := ui.ErrorWriter.String(); !strings.Contains(out, cmd.Help()) {
+		t.Fatalf("expected help output, got: %s", out)
+	}
+	ui.ErrorWriter.Reset()
+
+	// Fails on eval lookup failure
+	if code := cmd.Run([]string{"-address=" + url, "3E55C771-76FC-423B-BCED-3E5314F433B1"}); code != 1 {
+		t.Fatalf("expect exit 1, got: %d", code)
+	}
+	if out := ui.ErrorWriter.String(); !strings.Contains(out, "not found") {
+		t.Fatalf("expect not found error, got: %s", out)
+	}
+	ui.ErrorWriter.Reset()
+
+	// Fails on connection failure
+	if code := cmd.Run([]string{"-address=nope", "nope"}); code != 1 {
+		t.Fatalf("expected exit code 1, got: %d", code)
+	}
+	if out := ui.ErrorWriter.String(); !strings.Contains(out, "Error reading evaluation") {
+		t.Fatalf("expected failed query error, got: %s", out)
+	}
+}