/
docker_stats_input.go
201 lines (181 loc) · 6.21 KB
/
docker_stats_input.go
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package dockerstats
import (
"fmt"
"strings"
"time"
"github.com/mozilla-services/heka/message"
"github.com/mozilla-services/heka/pipeline"
"github.com/pborman/uuid"
"github.com/tommyvicananza/go-dockerclient"
)
type dockerStat struct {
CPUPercent float64
MemPercent float64
MemUsage uint64
MemLimit uint64
NetworkRx uint64
NetworkTx uint64
BlockRead uint64
BlockWrite uint64
}
type DockerStatsInputConfig struct {
TickerInterval uint `toml:"ticker_interval"`
NameFromEnv string `toml:"name_from_env"`
}
type DockerStatsInput struct {
*DockerStatsInputConfig
stop chan bool
runner pipeline.InputRunner
cacheHostnames map[string]string
}
func (input *DockerStatsInput) ConfigStruct() interface{} {
return &DockerStatsInputConfig{
TickerInterval: uint(60),
}
}
func (input *DockerStatsInput) Init(config interface{}) error {
input.DockerStatsInputConfig = config.(*DockerStatsInputConfig)
input.stop = make(chan bool)
input.cacheHostnames = make(map[string]string)
return nil
}
func (input *DockerStatsInput) Stop() {
close(input.stop)
}
func (input *DockerStatsInput) Run(runner pipeline.InputRunner,
helper pipeline.PluginHelper) error {
var pack *pipeline.PipelinePack
input.runner = runner
packSupply := runner.InChan()
tickChan := runner.Ticker()
hostname := helper.PipelineConfig().Hostname()
for {
select {
case <-input.stop:
return nil
case <-tickChan:
}
var (
// test chan bool
//err error
previousCPU, previousSystem uint64
mstats *dockerStat
preCPUStats, stats *docker.Stats
)
endpoint := "unix:///var/run/docker.sock"
client, _ := docker.NewClient(endpoint)
containers, _ := client.ListContainers(docker.ListContainersOptions{Filters: map[string][]string{"status": {"running"}}})
for _, container := range containers {
if containerName, exists := input.cacheHostnames[container.ID]; !exists {
containerName = strings.Replace(container.Names[0], "/", "", -1)
input.cacheHostnames[container.ID] = containerName
if input.NameFromEnv != "" {
con, _ := client.InspectContainer(container.ID)
for _, value := range con.Config.Env {
parts := strings.SplitN(value, "=", 2)
if len(parts) == 2 {
if input.NameFromEnv == parts[0] {
containerName = parts[1]
input.cacheHostnames[container.ID] = containerName
break
}
}
}
}
}
opts := docker.StatsStaticOptions{ID: container.ID, Stream: false}
preCPUStats, _ = client.StatsStatic(opts)
if preCPUStats == nil {
continue
}
previousCPU = preCPUStats.CPUStats.CPUUsage.TotalUsage
previousSystem = preCPUStats.CPUStats.SystemCPUUsage
stats, _ = client.StatsStatic(opts)
if stats == nil {
continue
}
mstats = &dockerStat{}
mstats.CPUPercent = calculateCPUPercent(previousCPU, previousSystem, stats)
mstats.MemPercent = calculateMemPercent(stats)
mstats.MemUsage = stats.MemoryStats.Usage
mstats.MemLimit = stats.MemoryStats.Limit
mstats.BlockRead, mstats.BlockWrite = calculateBlockIO(stats)
for _, networkstat := range stats.Networks {
mstats.NetworkRx = networkstat.RxBytes
mstats.NetworkTx = networkstat.TxBytes
}
pack = <-packSupply
pack.Message.SetUuid(uuid.NewRandom())
pack.Message.SetTimestamp(time.Now().Unix())
pack.Message.SetType("DockerStats")
pack.Message.SetHostname(hostname)
containerName, _ := message.NewField("ContainerName", string(strings.Replace(input.cacheHostnames[container.ID], "-", "_", -1)), "")
pack.Message.AddField(containerName)
cpuPercent, _ := message.NewField("CPUPercent", float64(mstats.CPUPercent), "")
pack.Message.AddField(cpuPercent)
memPercent, _ := message.NewField("MemoryPercent", float64(mstats.MemPercent), "")
pack.Message.AddField(memPercent)
memLimit, _ := message.NewField("MemoryLimit", int64(mstats.MemLimit), "")
pack.Message.AddField(memLimit)
memUsage, _ := message.NewField("MemoryUsage", int64(mstats.MemUsage), "")
pack.Message.AddField(memUsage)
netInput, _ := message.NewField("NetworkInput", int64(mstats.NetworkRx), "")
pack.Message.AddField(netInput)
netOutput, _ := message.NewField("NetworkOutput", int64(mstats.NetworkTx), "")
pack.Message.AddField(netOutput)
blockInput, _ := message.NewField("BlockInput", int64(mstats.BlockRead), "")
pack.Message.AddField(blockInput)
blockOutput, _ := message.NewField("BlockOutput", int64(mstats.BlockWrite), "")
pack.Message.AddField(blockOutput)
pack.Message.SetPayload(fmt.Sprintf("container_name %s\ncpu %.2f\nmem_usage %d\nmem_limit %d\nmem %.2f\nnet_input %d\nnet_output %d\nblock_input %d\nblock_output %d",
strings.Replace(input.cacheHostnames[container.ID], "-", "_", -1),
mstats.CPUPercent,
mstats.MemUsage,
mstats.MemLimit,
mstats.MemPercent,
mstats.NetworkRx,
mstats.NetworkTx,
mstats.BlockRead,
mstats.BlockWrite))
runner.Deliver(pack)
}
}
return nil
}
func init() {
pipeline.RegisterPlugin("DockerStatsInput", func() interface{} {
return new(DockerStatsInput)
})
}
func calculateCPUPercent(previousCPU, previousSystem uint64, stats *docker.Stats) float64 {
var (
cpuPercent = 0.0
// calculate the change for the cpu usage of the container in between readings
cpuDelta = float64(stats.CPUStats.CPUUsage.TotalUsage) - float64(previousCPU)
// calculate the change for the entire system between readings
systemDelta = float64(stats.CPUStats.SystemCPUUsage) - float64(previousSystem)
)
if systemDelta > 0.0 && cpuDelta > 0.0 {
cpuPercent = (cpuDelta / systemDelta) * float64(len(stats.CPUStats.CPUUsage.PercpuUsage)) * 100.0
}
return cpuPercent
}
func calculateBlockIO(stats *docker.Stats) (blkRead uint64, blkWrite uint64) {
blkio := stats.BlkioStats
for _, bioEntry := range blkio.IOServiceBytesRecursive {
switch strings.ToLower(bioEntry.Op) {
case "read":
blkRead = blkRead + bioEntry.Value
case "write":
blkWrite = blkWrite + bioEntry.Value
}
}
return
}
func calculateMemPercent(stats *docker.Stats) float64 {
var memPercent = 0.0
if stats.MemoryStats.Limit != 0 {
memPercent = float64(stats.MemoryStats.Usage) / float64(stats.MemoryStats.Limit) * 100.0
}
return memPercent
}