// GetMetricTypes returns list of available metrics
func (d *docker) GetMetricTypes(_ plugin.ConfigType) ([]plugin.MetricType, error) {
var metricTypes []plugin.MetricType
var err error
// initialize containerData struct
data := containerData{
Stats: wrapper.NewStatistics(),
}
// generate available namespace for data container structure
dockerMetrics := []string{}
utils.FromCompositeObject(data, "", &dockerMetrics)
nscreator := nsCreator{dynamicElements: definedDynamicElements}
for _, metricName := range dockerMetrics {
ns := core.NewNamespace(NS_VENDOR, NS_PLUGIN).
AddDynamicElement("docker_id", "an id of docker container")
if ns, err = nscreator.createMetricNamespace(ns, metricName); err != nil {
// skip this metric name which is not supported
// fmt.Fprintf(os.Stderr, "Error in creating metric namespace: %v\n", err)
continue
}
metricType := plugin.MetricType{
Namespace_: ns,
Version_: VERSION,
}
metricTypes = append(metricTypes, metricType)
}
return metricTypes, nil
}
func CreateMockStats() *wrapper.Statistics {
stats := wrapper.NewStatistics()
stats.Connection.Tcp.Close = 1
stats.Connection.Tcp.Established = 1
stats.Connection.Tcp6.Close = 2
stats.Connection.Tcp6.Established = 2
stats.Network = []wrapper.NetworkInterface{
wrapper.NetworkInterface{
Name: "eth0",
RxBytes: 1024,
RxPackets: 1,
TxBytes: 4096,
TxPackets: 4,
TxErrors: 0,
},
wrapper.NetworkInterface{
Name: "eth1",
RxBytes: 2048,
RxPackets: 2,
TxBytes: 0,
TxPackets: 0,
TxErrors: 10,
},
}
stats.Filesystem["dev1"] = wrapper.FilesystemInterface{
Device: "dev1",
Type: "vfs",
Limit: 0,
Usage: 0,
BaseUsage: 0,
Available: 0,
InodesFree: 0,
ReadsCompleted: 0,
}
stats.Filesystem["dev2"] = wrapper.FilesystemInterface{
Device: "dev2",
Type: "vfs",
Limit: 0,
Usage: 0,
BaseUsage: 0,
Available: 0,
InodesFree: 0,
ReadsCompleted: 0,
}
stats.CgroupStats.CpuStats.CpuUsage.PercpuUsage = []uint64{1000, 2000, 3000, 4000}
return stats
}
// GetStatsFromContainer returns docker containers stats: cgroups stats (cpu usage, memory usage, etc.) and network stats (tx_bytes, rx_bytes etc.);
// notes that incoming container id has to be full-length to be able to inspect container
func (dc *DockerClient) GetStatsFromContainer(id string, collectFs bool) (*wrapper.Statistics, error) {
var (
err error
pid int
workingSet uint64
container = &docker.Container{}
groupWrap = wrapper.CgroupsToStats // wrapper for cgroup name and interface for stats extraction
stats = wrapper.NewStatistics()
)
if !isHost(id) {
if !isFullLengthID(id) {
return nil, fmt.Errorf("Container id %+v is not fully-length - cannot inspect container", id)
}
// inspect container based only on fully-length container id.
container, err = dc.InspectContainer(id)
if err != nil {
return nil, err
}
// take docker container PID
pid = container.State.Pid
}
for cg, stat := range groupWrap {
groupPath, err := getSubsystemPath(cg, id)
if err != nil {
fmt.Fprintln(os.Stderr, "Cannot found subsystem path for cgroup=", cg, " for container id=", container)
continue
}
switch cg {
case "cpuset":
cpuset := wrapper.CpuSet{}
// get cpuset group stats
err = cpuset.GetExtendedStats(groupPath, stats.CgroupsExtended)
case "shares":
// get cpu.shares stats
shares := wrapper.Shares{}
err = shares.GetExtendedStats(groupPath, stats.CgroupsExtended)
default:
// get cgroup stats for given docker
err = stat.GetStats(groupPath, stats.CgroupStats)
}
if err != nil {
// just log about it
if isHost(id) {
fmt.Fprintln(os.Stderr, "Cannot obtain cgroups statistics for host, err=", err)
} else {
fmt.Fprintln(os.Stderr, "Cannot obtain cgroups statistics for container: id=", id, ", image=", container.Image, ", name=", container.Name, ", err=", err)
}
continue
}
}
// calculate additional stats memory:working_set based on memory_stats
if totalInactiveAnon, ok := stats.CgroupStats.MemoryStats.Stats["total_inactive_anon"]; ok {
workingSet = stats.CgroupStats.MemoryStats.Usage.Usage
if workingSet < totalInactiveAnon {
workingSet = 0
} else {
workingSet -= totalInactiveAnon
}
if totalInactiveFile, ok := stats.CgroupStats.MemoryStats.Stats["total_inactive_file"]; ok {
if workingSet < totalInactiveFile {
workingSet = 0
} else {
workingSet -= totalInactiveFile
}
}
}
stats.CgroupStats.MemoryStats.Stats["working_set"] = workingSet
if !isHost(id) {
rootFs := "/"
stats.Network, err = network.NetworkStatsFromProc(rootFs, pid)
if err != nil {
// only log error message
fmt.Fprintf(os.Stderr, "Unable to get network stats, containerID=%+v, pid %d: %v", container.ID, pid, err)
}
stats.Connection.Tcp, err = network.TcpStatsFromProc(rootFs, pid)
if err != nil {
// only log error message
fmt.Fprintf(os.Stderr, "Unable to get tcp stats from pid %d: %v", pid, err)
}
stats.Connection.Tcp6, err = network.Tcp6StatsFromProc(rootFs, pid)
if err != nil {
// only log error message
fmt.Fprintf(os.Stderr, "Unable to get tcp6 stats from pid %d: %v", pid, err)
}
} else {
stats.Network, err = network.NetworkStatsFromRoot()
if err != nil {
// only log error message
fmt.Fprintf(os.Stderr, "Unable to get network stats, containerID=%v, %v", id, err)
}
}
if collectFs {
stats.Filesystem, err = fs.GetFsStats(container)
if err != nil {
// only log error message
fmt.Fprintf(os.Stderr, "Unable to get filesystem stats for docker: %v, err=%v", id, err)
}
}
return stats, nil
}