refactor collectors into subpackage

connector/collector/docker.go

@@ -0,0 +1,113 @@
+package collector
+
+import (
+	"github.com/bcicen/ctop/metrics"
+	api "github.com/fsouza/go-dockerclient"
+)
+
+// Docker collector
+type Docker struct {
+	metrics.Metrics
+	id         string
+	client     *api.Client
+	running    bool
+	stream     chan metrics.Metrics
+	done       chan bool
+	lastCpu    float64
+	lastSysCpu float64
+}
+
+func NewDocker(client *api.Client, id string) *Docker {
+	return &Docker{
+		Metrics: metrics.Metrics{},
+		id:      id,
+		client:  client,
+	}
+}
+
+func (c *Docker) Start() {
+	c.done = make(chan bool)
+	c.stream = make(chan metrics.Metrics)
+	stats := make(chan *api.Stats)
+
+	go func() {
+		opts := api.StatsOptions{
+			ID:     c.id,
+			Stats:  stats,
+			Stream: true,
+			Done:   c.done,
+		}
+		c.client.Stats(opts)
+		c.running = false
+	}()
+
+	go func() {
+		defer close(c.stream)
+		for s := range stats {
+			c.ReadCPU(s)
+			c.ReadMem(s)
+			c.ReadNet(s)
+			c.ReadIO(s)
+			c.stream <- c.Metrics
+		}
+		log.Infof("collector stopped for container: %s", c.id)
+	}()
+
+	c.running = true
+	log.Infof("collector started for container: %s", c.id)
+}
+
+func (c *Docker) Running() bool {
+	return c.running
+}
+
+func (c *Docker) Stream() chan metrics.Metrics {
+	return c.stream
+}
+
+// Stop collector
+func (c *Docker) Stop() {
+	c.done <- true
+}
+
+func (c *Docker) ReadCPU(stats *api.Stats) {
+	ncpus := float64(len(stats.CPUStats.CPUUsage.PercpuUsage))
+	total := float64(stats.CPUStats.CPUUsage.TotalUsage)
+	system := float64(stats.CPUStats.SystemCPUUsage)
+
+	cpudiff := total - c.lastCpu
+	syscpudiff := system - c.lastSysCpu
+
+	c.CPUUtil = round((cpudiff / syscpudiff * 100) * ncpus)
+	c.lastCpu = total
+	c.lastSysCpu = system
+	c.Pids = int(stats.PidsStats.Current)
+}
+
+func (c *Docker) ReadMem(stats *api.Stats) {
+	c.MemUsage = int64(stats.MemoryStats.Usage)
+	c.MemLimit = int64(stats.MemoryStats.Limit)
+	c.MemPercent = percent(float64(c.MemUsage), float64(c.MemLimit))
+}
+
+func (c *Docker) ReadNet(stats *api.Stats) {
+	var rx, tx int64
+	for _, network := range stats.Networks {
+		rx += int64(network.RxBytes)
+		tx += int64(network.TxBytes)
+	}
+	c.NetRx, c.NetTx = rx, tx
+}
+
+func (c *Docker) ReadIO(stats *api.Stats) {
+	var read, write int64
+	for _, blk := range stats.BlkioStats.IOServiceBytesRecursive {
+		if blk.Op == "Read" {
+			read = int64(blk.Value)
+		}
+		if blk.Op == "Write" {
+			write = int64(blk.Value)
+		}
+	}
+	c.IOBytesRead, c.IOBytesWrite = read, write
+}