Correctly send stats & proc information back for servers

environment/stats.go

@@ -0,0 +1,47 @@
+package environment
+
+import "sync"
+
+// Defines the current resource usage for a given server instance. If a server is offline you
+// should obviously expect memory and CPU usage to be 0. However, disk will always be returned
+// since that is not dependent on the server being running to collect that data.
+type Stats struct {
+	mu sync.RWMutex
+
+	// The total amount of memory, in bytes, that this server instance is consuming. This is
+	// calculated slightly differently than just using the raw Memory field that the stats
+	// return from the container, so please check the code setting this value for how that
+	// is calculated.
+	Memory uint64 `json:"memory_bytes"`
+
+	// The total amount of memory this container or resource can use. Inside Docker this is
+	// going to be higher than you'd expect because we're automatically allocating overhead
+	// abilities for the container, so its not going to be a perfect match.
+	MemoryLimit uint64 `json:"memory_limit_bytes"`
+
+	// The absolute CPU usage is the amount of CPU used in relation to the entire system and
+	// does not take into account any limits on the server process itself.
+	CpuAbsolute float64 `json:"cpu_absolute"`
+
+	// The current disk space being used by the server. This is cached to prevent slow lookup
+	// issues on frequent refreshes.
+	// Disk int64 `json:"disk_bytes"`
+
+	// Current network transmit in & out for a container.
+	Network struct {
+		RxBytes uint64 `json:"rx_bytes"`
+		TxBytes uint64 `json:"tx_bytes"`
+	} `json:"network"`
+}
+
+// Resets the usages values to zero, used when a server is stopped to ensure we don't hold
+// onto any values incorrectly.
+func (s *Stats) Empty() {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	s.Memory = 0
+	s.CpuAbsolute = 0
+	s.Network.TxBytes = 0
+	s.Network.RxBytes = 0
+}