Merge pull request #6239 from hashicorp/b-32bitmem

Fix memory fingerprinting on 32bit

.circleci/config.yml

@@ -54,6 +54,13 @@ workflows:
           name: "test-shared-exec"
           test_packages: "./drivers/shared/executor"
           <<: *IGNORE_FOR_UI_BRANCHES
+      - test-machine:
+          name: "test-32bit"
+          # Currently we only explicitly test fingerprinting on 32bit
+          # architectures.
+          test_packages: "./client/fingerprint"
+          goarch: "386"
+          <<: *IGNORE_FOR_UI_BRANCHES
       - test-rkt:
           <<: *IGNORE_FOR_UI_BRANCHES
       - test-e2e:
@@ -118,11 +125,15 @@ jobs:
       exclude_packages:
         type: string
         default: ""
+      goarch:
+        type: string
+        default: "amd64"
     environment:
       <<: *COMMON_ENVS
       GOTEST_PKGS: "<< parameters.test_packages >>"
       GOTEST_PKGS_EXCLUDE: "<< parameters.exclude_packages >>"
       GOPATH: /go
+      GOTESTARCH: "<< parameters.goarch >>"
     steps:
       - checkout
       - run: make deps
@@ -191,17 +202,30 @@ jobs:
       executor:
         type: string
         default: "go-machine-recent"
+      goarch:
+        type: string
+        default: "amd64"
     environment:
       <<: *COMMON_ENVS
       GOTEST_PKGS_EXCLUDE: "<< parameters.exclude_packages >>"
       GOTEST_PKGS: "<< parameters.test_packages >>"
       GOPATH: /home/circleci/go
+      GOTESTARCH: "<< parameters.goarch >>"
     steps:
       - checkout
       - install-golang
       - install-protoc
       - install-consul
       - install-vault
+      - run:
+          name: Install 32bit gcc libs
+          command: |
+            if [ ! -z $GOTESTARCH ] && [ $GOTESTARCH == "386" ]; then
+              sudo apt-get update
+              sudo apt-get install -y gcc-multilib
+            else
+              echo "Skipping 32bit lib installation while building for not 386"
+            fi
       - run: PATH="$GOPATH/bin:/usr/local/go/bin:$PATH" make bootstrap
       - run-tests
       - store_test_results:
@@ -330,6 +354,10 @@ commands:
               unset GOTEST_PKGS
             fi
 
+            if [ ! -z $GOTESTARCH ]; then
+              export GOARCH="$GOTESTARCH";
+            fi
+
             mkdir -p /tmp/test-reports
             sudo -E PATH="$GOPATH/bin:/usr/local/go/bin:$PATH" make generate-structs
             sudo -E PATH="$GOPATH/bin:/usr/local/go/bin:$PATH" make test-nomad

client/fingerprint/memory.go

@@ -8,7 +8,7 @@ import (
 	"github.com/shirou/gopsutil/mem"
 )
 
-const bytesInMB = 1024 * 1024
+const bytesInMB int64 = 1024 * 1024
 
 // MemoryFingerprint is used to fingerprint the available memory on the node
 type MemoryFingerprint struct {
@@ -25,10 +25,10 @@ func NewMemoryFingerprint(logger log.Logger) Fingerprint {
 }
 
 func (f *MemoryFingerprint) Fingerprint(req *FingerprintRequest, resp *FingerprintResponse) error {
-	var totalMemory int
+	var totalMemory int64
 	cfg := req.Config
 	if cfg.MemoryMB != 0 {
-		totalMemory = cfg.MemoryMB * bytesInMB
+		totalMemory = int64(cfg.MemoryMB) * bytesInMB
 	} else {
 		memInfo, err := mem.VirtualMemory()
 		if err != nil {
@@ -36,21 +36,23 @@ func (f *MemoryFingerprint) Fingerprint(req *FingerprintRequest, resp *Fingerpri
 			return err
 		}
 		if memInfo.Total > 0 {
-			totalMemory = int(memInfo.Total)
+			totalMemory = int64(memInfo.Total)
 		}
 	}
 
 	if totalMemory > 0 {
 		resp.AddAttribute("memory.totalbytes", fmt.Sprintf("%d", totalMemory))
 
-		// COMPAT(0.10): Remove in 0.10
+		memoryMB := totalMemory / bytesInMB
+
+		// COMPAT(0.10): Unused since 0.9.
 		resp.Resources = &structs.Resources{
-			MemoryMB: totalMemory / bytesInMB,
+			MemoryMB: int(memoryMB),
 		}
 
 		resp.NodeResources = &structs.NodeResources{
 			Memory: structs.NodeMemoryResources{
-				MemoryMB: int64(totalMemory / bytesInMB),
+				MemoryMB: memoryMB,
 			},
 		}
 	}

client/fingerprint/memory_test.go

@@ -11,6 +11,8 @@ import (
 )
 
 func TestMemoryFingerprint(t *testing.T) {
+	require := require.New(t)
+
 	f := NewMemoryFingerprint(testlog.HCLogger(t))
 	node := &structs.Node{
 		Attributes: make(map[string]string),
@@ -19,24 +21,13 @@ func TestMemoryFingerprint(t *testing.T) {
 	request := &FingerprintRequest{Config: &config.Config{}, Node: node}
 	var response FingerprintResponse
 	err := f.Fingerprint(request, &response)
-	if err != nil {
-		t.Fatalf("err: %v", err)
-	}
+	require.NoError(err)
 
 	assertNodeAttributeContains(t, response.Attributes, "memory.totalbytes")
-
-	if response.Resources == nil {
-		t.Fatalf("response resources should not be nil")
-	}
-
-	// COMPAT(0.10): Remove in 0.10
-	if response.Resources.MemoryMB == 0 {
-		t.Fatalf("Expected node.Resources.MemoryMB to be non-zero")
-	}
-
-	if response.NodeResources.Memory.MemoryMB == 0 {
-		t.Fatalf("Expected node.Resources.MemoryMB to be non-zero")
-	}
+	require.NotNil(response.Resources, "expected response Resources to not be nil")
+	require.NotZero(response.Resources.MemoryMB, "expected memory to be non-zero")
+	require.NotNil(response.NodeResources, "expected response NodeResources to not be nil")
+	require.NotZero(response.NodeResources.Memory.MemoryMB, "expected memory to be non-zero")
 }
 
 func TestMemoryFingerprint_Override(t *testing.T) {
@@ -56,6 +47,7 @@ func TestMemoryFingerprint_Override(t *testing.T) {
 	assertNodeAttributeContains(t, response.Attributes, "memory.totalbytes")
 	require := require.New(t)
 	require.NotNil(response.Resources)
-	require.Equal(response.Resources.MemoryMB, memoryMB)
+	require.EqualValues(response.Resources.MemoryMB, memoryMB)
+	require.NotNil(response.NodeResources)
 	require.EqualValues(response.NodeResources.Memory.MemoryMB, memoryMB)
 }