Merge pull request #1844 from hashicorp/b-alloc-stats

Don't query for stats if the node is down and handle the errors

Author: dadgar

api/allocations.go

@@ -8,6 +8,12 @@ import (
 	"github.com/hashicorp/go-cleanhttp"
 )
 
+var (
+	// NodeDownErr marks an operation as not able to complete since the node is
+	// down.
+	NodeDownErr = fmt.Errorf("node down")
+)
+
 // Allocations is used to query the alloc-related endpoints.
 type Allocations struct {
 	client *Client
@@ -48,6 +54,9 @@ func (a *Allocations) Stats(alloc *Allocation, q *QueryOptions) (*AllocResourceU
 	if err != nil {
 		return nil, err
 	}
+	if node.Status == "down" {
+		return nil, NodeDownErr
+	}
 	if node.HTTPAddr == "" {
 		return nil, fmt.Errorf("http addr of the node where alloc %q is running is not advertised", alloc.ID)
 	}

command/alloc_status.go

@@ -234,7 +234,11 @@ func (c *AllocStatusCommand) Run(args []string) int {
 		stats, statsErr = client.Allocations().Stats(alloc, nil)
 		if statsErr != nil {
 			c.Ui.Output("")
-			c.Ui.Error(fmt.Sprintf("couldn't retrieve stats (HINT: ensure Client.Advertise.HTTP is set): %v", statsErr))
+			if statsErr != api.NodeDownErr {
+				c.Ui.Error(fmt.Sprintf("couldn't retrieve stats (HINT: ensure Client.Advertise.HTTP is set): %v", statsErr))
+			} else {
+				c.Ui.Output("Omitting resource statistics since the node is down.")
+			}
 		}
 		c.outputTaskDetails(alloc, stats, displayStats)
 	}
@@ -408,12 +412,14 @@ func (c *AllocStatusCommand) outputTaskResources(alloc *api.Allocation, task str
 	// Display the rolled up stats. If possible prefer the live stastics
 	cpuUsage := strconv.Itoa(resource.CPU)
 	memUsage := humanize.IBytes(uint64(resource.MemoryMB * bytesPerMegabyte))
-	if ru, ok := stats.Tasks[task]; ok && ru != nil && ru.ResourceUsage != nil {
-		if cs := ru.ResourceUsage.CpuStats; cs != nil {
-			cpuUsage = fmt.Sprintf("%v/%v", math.Floor(cs.TotalTicks), resource.CPU)
-		}
-		if ms := ru.ResourceUsage.MemoryStats; ms != nil {
-			memUsage = fmt.Sprintf("%v/%v", humanize.IBytes(ms.RSS), memUsage)
+	if stats != nil {
+		if ru, ok := stats.Tasks[task]; ok && ru != nil && ru.ResourceUsage != nil {
+			if cs := ru.ResourceUsage.CpuStats; cs != nil {
+				cpuUsage = fmt.Sprintf("%v/%v", math.Floor(cs.TotalTicks), resource.CPU)
+			}
+			if ms := ru.ResourceUsage.MemoryStats; ms != nil {
+				memUsage = fmt.Sprintf("%v/%v", humanize.IBytes(ms.RSS), memUsage)
+			}
 		}
 	}
 	resourcesOutput = append(resourcesOutput, fmt.Sprintf("%v MHz|%v|%v|%v|%v",
@@ -427,9 +433,11 @@ func (c *AllocStatusCommand) outputTaskResources(alloc *api.Allocation, task str
 	}
 	c.Ui.Output(formatListWithSpaces(resourcesOutput))
 
-	if ru, ok := stats.Tasks[task]; ok && ru != nil && displayStats && ru.ResourceUsage != nil {
-		c.Ui.Output("")
-		c.outputVerboseResourceUsage(task, ru.ResourceUsage)
+	if stats != nil {
+		if ru, ok := stats.Tasks[task]; ok && ru != nil && displayStats && ru.ResourceUsage != nil {
+			c.Ui.Output("")
+			c.outputVerboseResourceUsage(task, ru.ResourceUsage)
+		}
 	}
 }