Added logic to read NetworkInfo from /state.json.

records/state/state.go

@@ -46,9 +46,22 @@ type Label struct {
 
 // Status holds a task status as defined in the /state.json Mesos HTTP endpoint.
 type Status struct {
-	Timestamp float64 `json:"timestamp"`
-	State     string  `json:"state"`
-	Labels    []Label `json:"labels,omitempty"`
+	Timestamp       float64         `json:"timestamp"`
+	State           string          `json:"state"`
+	Labels          []Label         `json:"labels,omitempty"`
+	ContainerStatus ContainerStatus `json:"container_status,omitempty"`
+}
+
+// ContainerStatus holds container metadata as defined in the /state.json
+// Mesos HTTP endpoint.
+type ContainerStatus struct {
+	NetworkInfos []NetworkInfo `json:"network_infos,omitempty"`
+}
+
+// NetworkInfo holds a network address resolution as defined in the
+// /state.json Mesos HTTP endpoint.
+type NetworkInfo struct {
+	IPAddress string `json:"ip_address,omitempty"`
 }
 
 // Task holds a task as defined in the /state.json Mesos HTTP endpoint.
@@ -103,7 +116,18 @@ func (t *Task) containerIP(src string) string {
 			continue
 		}
 
-		// find the latest docker-inspect label
+		// first try to extract the address from the NetworkInfo structure
+		if len(status.ContainerStatus.NetworkInfos) > 0 {
+			// TODO(CD): handle multiple NetworkInfo objects
+			// TODO(CD): only create A records if the address is IPv4
+			// TODO(CD): create AAAA records if the address is IPv6
+			latestContainerIP = status.ContainerStatus.NetworkInfos[0].IPAddress
+			latestTimestamp = status.Timestamp
+			continue // Skip label inspection step below for this element
+		}
+
+		// next, fall back to the docker-inspect label
+		// TODO(CD): deprecate and then remove this address discovery method
 		for _, label := range status.Labels {
 			if label.Key == ipLabel {
 				latestContainerIP = label.Value

records/state/state_test.go

@@ -38,3 +38,63 @@ func TestPID_UnmarshalJSON(t *testing.T) {
 		}
 	}
 }
+
+func TestTask_containerIP(t *testing.T) {
+	makeTask := func(networkInfoAddress string, label Label) Task {
+		labels := make([]Label, 0, 1)
+		if label.Key != "" {
+			labels = append(labels, label)
+		}
+
+		var containerStatus ContainerStatus
+		if networkInfoAddress != "" {
+			containerStatus = ContainerStatus{
+				NetworkInfos: []NetworkInfo{
+					NetworkInfo{
+						IPAddress: networkInfoAddress,
+					},
+				},
+			}
+		}
+
+		return Task{
+			State: "TASK_RUNNING",
+			Statuses: []Status{
+				Status{
+					Timestamp:       1.0,
+					State:           "TASK_RUNNING",
+					Labels:          labels,
+					ContainerStatus: containerStatus,
+				},
+			},
+		}
+	}
+
+	// Verify IP extraction from NetworkInfo
+	task := makeTask("1.2.3.4", Label{})
+	if task.containerIP("mesos") != "1.2.3.4" {
+		t.Errorf("Failed to extract IP from NetworkInfo")
+	}
+
+	// Verify IP extraction from NetworkInfo takes precedence over
+	// labels
+	task = makeTask("1.2.3.4",
+		Label{Key: ipLabels["mesos"], Value: "2.4.6.8"})
+	if task.containerIP("mesos") != "1.2.3.4" {
+		t.Errorf("Failed to extract IP from NetworkInfo when label also supplied")
+	}
+
+	// Verify IP extraction from the Mesos label without NetworkInfo
+	task = makeTask("",
+		Label{Key: ipLabels["mesos"], Value: "1.2.3.4"})
+	if task.containerIP("mesos") != "1.2.3.4" {
+		t.Errorf("Failed to extract IP from Mesos label")
+	}
+
+	// Verify IP extraction from the Docker label without NetworkInfo
+	task = makeTask("",
+		Label{Key: ipLabels["docker"], Value: "1.2.3.4"})
+	if task.containerIP("docker") != "1.2.3.4" {
+		t.Errorf("Failed to extract IP from Docker label")
+	}
+}