mirror of
https://github.com/weaveworks/scope.git
synced 2026-03-03 02:00:43 +00:00
393 lines
10 KiB
Go
393 lines
10 KiB
Go
package docker
|
|
|
|
import (
|
|
"bufio"
|
|
"fmt"
|
|
"io"
|
|
"net"
|
|
"net/http"
|
|
"net/http/httputil"
|
|
"net/url"
|
|
"strconv"
|
|
"strings"
|
|
"sync"
|
|
"time"
|
|
|
|
log "github.com/Sirupsen/logrus"
|
|
docker "github.com/fsouza/go-dockerclient"
|
|
"github.com/ugorji/go/codec"
|
|
|
|
"github.com/weaveworks/scope/common/mtime"
|
|
"github.com/weaveworks/scope/report"
|
|
)
|
|
|
|
// These constants are keys used in node metadata
|
|
const (
|
|
ContainerName = "docker_container_name"
|
|
ContainerCommand = "docker_container_command"
|
|
ContainerPorts = "docker_container_ports"
|
|
ContainerCreated = "docker_container_created"
|
|
ContainerIPs = "docker_container_ips"
|
|
ContainerHostname = "docker_container_hostname"
|
|
ContainerIPsWithScopes = "docker_container_ips_with_scopes"
|
|
ContainerState = "docker_container_state"
|
|
ContainerUptime = "docker_container_uptime"
|
|
ContainerRestartCount = "docker_container_restart_count"
|
|
ContainerNetworkMode = "docker_container_network_mode"
|
|
|
|
NetworkRxDropped = "network_rx_dropped"
|
|
NetworkRxBytes = "network_rx_bytes"
|
|
NetworkRxErrors = "network_rx_errors"
|
|
NetworkTxPackets = "network_tx_packets"
|
|
NetworkTxDropped = "network_tx_dropped"
|
|
NetworkRxPackets = "network_rx_packets"
|
|
NetworkTxErrors = "network_tx_errors"
|
|
NetworkTxBytes = "network_tx_bytes"
|
|
|
|
MemoryMaxUsage = "docker_memory_max_usage"
|
|
MemoryUsage = "docker_memory_usage"
|
|
MemoryFailcnt = "docker_memory_failcnt"
|
|
MemoryLimit = "docker_memory_limit"
|
|
|
|
CPUPercpuUsage = "docker_cpu_per_cpu_usage"
|
|
CPUUsageInUsermode = "docker_cpu_usage_in_usermode"
|
|
CPUTotalUsage = "docker_cpu_total_usage"
|
|
CPUUsageInKernelmode = "docker_cpu_usage_in_kernelmode"
|
|
CPUSystemCPUUsage = "docker_cpu_system_cpu_usage"
|
|
|
|
StateRunning = "running"
|
|
StateStopped = "stopped"
|
|
StatePaused = "paused"
|
|
|
|
NetworkModeHost = "host"
|
|
|
|
stopTimeout = 10
|
|
)
|
|
|
|
// Exported for testing
|
|
var (
|
|
DialStub = net.Dial
|
|
NewClientConnStub = newClientConn
|
|
)
|
|
|
|
func newClientConn(c net.Conn, r *bufio.Reader) ClientConn {
|
|
return httputil.NewClientConn(c, r)
|
|
}
|
|
|
|
// ClientConn is exported for testing
|
|
type ClientConn interface {
|
|
Do(req *http.Request) (resp *http.Response, err error)
|
|
Close() error
|
|
}
|
|
|
|
// Container represents a Docker container
|
|
type Container interface {
|
|
UpdateState(*docker.Container)
|
|
|
|
ID() string
|
|
Image() string
|
|
PID() int
|
|
Hostname() string
|
|
GetNode(string, []net.IP) report.Node
|
|
State() string
|
|
HasTTY() bool
|
|
Container() *docker.Container
|
|
StartGatheringStats() error
|
|
StopGatheringStats()
|
|
}
|
|
|
|
type container struct {
|
|
sync.RWMutex
|
|
container *docker.Container
|
|
statsConn ClientConn
|
|
latestStats docker.Stats
|
|
pendingStats [20]docker.Stats
|
|
numPending int
|
|
}
|
|
|
|
// NewContainer creates a new Container
|
|
func NewContainer(c *docker.Container) Container {
|
|
return &container{
|
|
container: c,
|
|
}
|
|
}
|
|
|
|
func (c *container) UpdateState(container *docker.Container) {
|
|
c.Lock()
|
|
defer c.Unlock()
|
|
c.container = container
|
|
}
|
|
|
|
func (c *container) ID() string {
|
|
return c.container.ID
|
|
}
|
|
|
|
func (c *container) Image() string {
|
|
return c.container.Image
|
|
}
|
|
|
|
func (c *container) PID() int {
|
|
return c.container.State.Pid
|
|
}
|
|
|
|
func (c *container) Hostname() string {
|
|
if c.container.Config.Domainname == "" {
|
|
return c.container.Config.Hostname
|
|
}
|
|
|
|
return fmt.Sprintf("%s.%s", c.container.Config.Hostname,
|
|
c.container.Config.Domainname)
|
|
}
|
|
|
|
func (c *container) HasTTY() bool {
|
|
return c.container.Config.Tty
|
|
}
|
|
|
|
func (c *container) State() string {
|
|
if c.container.State.Paused {
|
|
return StatePaused
|
|
} else if c.container.State.Running {
|
|
return StateRunning
|
|
}
|
|
return StateStopped
|
|
}
|
|
|
|
func (c *container) Container() *docker.Container {
|
|
return c.container
|
|
}
|
|
|
|
func (c *container) StartGatheringStats() error {
|
|
c.Lock()
|
|
defer c.Unlock()
|
|
|
|
if c.statsConn != nil {
|
|
return fmt.Errorf("already gather stats for container %s", c.container.ID)
|
|
}
|
|
|
|
go func() {
|
|
log.Infof("docker container: collecting stats for %s", c.container.ID)
|
|
req, err := http.NewRequest("GET", fmt.Sprintf("/containers/%s/stats", c.container.ID), nil)
|
|
if err != nil {
|
|
log.Errorf("docker container: %v", err)
|
|
return
|
|
}
|
|
req.Header.Set("User-Agent", "weavescope")
|
|
|
|
url, err := url.Parse(endpoint)
|
|
if err != nil {
|
|
log.Errorf("docker container: %v", err)
|
|
return
|
|
}
|
|
|
|
dial, err := DialStub(url.Scheme, url.Path)
|
|
if err != nil {
|
|
log.Errorf("docker container: %v", err)
|
|
return
|
|
}
|
|
|
|
conn := NewClientConnStub(dial, nil)
|
|
resp, err := conn.Do(req)
|
|
if err != nil {
|
|
log.Errorf("docker container: %v", err)
|
|
return
|
|
}
|
|
defer resp.Body.Close()
|
|
|
|
c.Lock()
|
|
c.statsConn = conn
|
|
c.Unlock()
|
|
|
|
defer func() {
|
|
c.Lock()
|
|
defer c.Unlock()
|
|
|
|
log.Infof("docker container: stopped collecting stats for %s", c.container.ID)
|
|
c.statsConn = nil
|
|
}()
|
|
|
|
var stats docker.Stats
|
|
// Use a buffer since the codec library doesn't implicitly do it
|
|
bufReader := bufio.NewReader(resp.Body)
|
|
decoder := codec.NewDecoder(bufReader, &codec.JsonHandle{})
|
|
for err := decoder.Decode(&stats); err != io.EOF; err = decoder.Decode(&stats) {
|
|
if err != nil {
|
|
log.Errorf("docker container: error reading event, did container stop? %v", err)
|
|
return
|
|
}
|
|
|
|
c.Lock()
|
|
if c.numPending >= len(c.pendingStats) {
|
|
log.Warnf("docker container: dropping stats.")
|
|
} else {
|
|
c.latestStats = stats
|
|
c.pendingStats[c.numPending] = stats
|
|
c.numPending++
|
|
}
|
|
c.Unlock()
|
|
|
|
stats = docker.Stats{}
|
|
}
|
|
}()
|
|
|
|
return nil
|
|
}
|
|
|
|
func (c *container) StopGatheringStats() {
|
|
c.Lock()
|
|
defer c.Unlock()
|
|
|
|
if c.statsConn == nil {
|
|
return
|
|
}
|
|
|
|
c.statsConn.Close()
|
|
c.statsConn = nil
|
|
return
|
|
}
|
|
|
|
func (c *container) ports(localAddrs []net.IP) report.StringSet {
|
|
if c.container.NetworkSettings == nil {
|
|
return report.MakeStringSet()
|
|
}
|
|
|
|
ports := []string{}
|
|
for port, bindings := range c.container.NetworkSettings.Ports {
|
|
if len(bindings) == 0 {
|
|
ports = append(ports, fmt.Sprintf("%s", port))
|
|
continue
|
|
}
|
|
for _, b := range bindings {
|
|
if b.HostIP == "0.0.0.0" {
|
|
for _, ip := range localAddrs {
|
|
ports = append(ports, fmt.Sprintf("%s:%s->%s", ip, b.HostPort, port))
|
|
}
|
|
} else {
|
|
ports = append(ports, fmt.Sprintf("%s:%s->%s", b.HostIP, b.HostPort, port))
|
|
}
|
|
}
|
|
}
|
|
|
|
return report.MakeStringSet(ports...)
|
|
}
|
|
|
|
func (c *container) memoryUsageMetric(stats []docker.Stats) report.Metric {
|
|
result := report.MakeMetric()
|
|
for _, s := range stats {
|
|
result = result.Add(s.Read, float64(s.MemoryStats.Usage))
|
|
}
|
|
return result
|
|
}
|
|
|
|
func (c *container) cpuPercentMetric(stats []docker.Stats) report.Metric {
|
|
result := report.MakeMetric()
|
|
if len(stats) < 2 {
|
|
return result
|
|
}
|
|
|
|
previous := stats[0]
|
|
for _, s := range stats[1:] {
|
|
// Copies from docker/api/client/stats.go#L205
|
|
cpuDelta := float64(s.CPUStats.CPUUsage.TotalUsage - previous.CPUStats.CPUUsage.TotalUsage)
|
|
systemDelta := float64(s.CPUStats.SystemCPUUsage - previous.CPUStats.SystemCPUUsage)
|
|
cpuPercent := 0.0
|
|
if systemDelta > 0.0 && cpuDelta > 0.0 {
|
|
cpuPercent = (cpuDelta / systemDelta) * float64(len(s.CPUStats.CPUUsage.PercpuUsage)) * 100.0
|
|
}
|
|
result = result.Add(s.Read, cpuPercent)
|
|
available := float64(len(s.CPUStats.CPUUsage.PercpuUsage)) * 100.0
|
|
if available >= result.Max {
|
|
result.Max = available
|
|
}
|
|
previous = s
|
|
}
|
|
return result
|
|
}
|
|
|
|
func (c *container) metrics() report.Metrics {
|
|
if c.numPending == 0 {
|
|
return report.Metrics{}
|
|
}
|
|
pendingStats := c.pendingStats[:c.numPending]
|
|
result := report.Metrics{
|
|
MemoryUsage: c.memoryUsageMetric(pendingStats),
|
|
CPUTotalUsage: c.cpuPercentMetric(pendingStats),
|
|
}
|
|
|
|
// leave one stat to help with relative metrics
|
|
c.pendingStats[0] = c.pendingStats[c.numPending-1]
|
|
c.numPending = 1
|
|
return result
|
|
}
|
|
|
|
func (c *container) GetNode(hostID string, localAddrs []net.IP) report.Node {
|
|
c.RLock()
|
|
defer c.RUnlock()
|
|
|
|
ips := c.container.NetworkSettings.SecondaryIPAddresses
|
|
if c.container.NetworkSettings.IPAddress != "" {
|
|
ips = append(ips, c.container.NetworkSettings.IPAddress)
|
|
}
|
|
// Treat all Docker IPs as local scoped.
|
|
ipsWithScopes := []string{}
|
|
for _, ip := range ips {
|
|
ipsWithScopes = append(ipsWithScopes, report.MakeScopedAddressNodeID(hostID, ip))
|
|
}
|
|
|
|
state := c.State()
|
|
|
|
result := report.MakeNodeWith(map[string]string{
|
|
ContainerID: c.ID(),
|
|
ContainerName: strings.TrimPrefix(c.container.Name, "/"),
|
|
ContainerCreated: c.container.Created.Format(time.RFC822),
|
|
ContainerCommand: c.container.Path + " " + strings.Join(c.container.Args, " "),
|
|
ImageID: c.container.Image,
|
|
ContainerHostname: c.Hostname(),
|
|
ContainerState: state,
|
|
}).WithSets(report.EmptySets.
|
|
Add(ContainerPorts, c.ports(localAddrs)).
|
|
Add(ContainerIPs, report.MakeStringSet(ips...)).
|
|
Add(ContainerIPsWithScopes, report.MakeStringSet(ipsWithScopes...)),
|
|
).WithMetrics(
|
|
c.metrics(),
|
|
).WithParents(report.EmptySets.
|
|
Add(report.ContainerImage, report.MakeStringSet(report.MakeContainerImageNodeID(c.container.Image))),
|
|
)
|
|
|
|
if c.container.State.Paused {
|
|
result = result.WithControls(UnpauseContainer)
|
|
} else if c.container.State.Running {
|
|
uptime := (mtime.Now().Sub(c.container.State.StartedAt) / time.Second) * time.Second
|
|
networkMode := ""
|
|
if c.container.HostConfig != nil {
|
|
networkMode = c.container.HostConfig.NetworkMode
|
|
}
|
|
result = result.WithLatests(map[string]string{
|
|
ContainerUptime: uptime.String(),
|
|
ContainerRestartCount: strconv.Itoa(c.container.RestartCount),
|
|
ContainerNetworkMode: networkMode,
|
|
})
|
|
result = result.WithControls(
|
|
RestartContainer, StopContainer, PauseContainer, AttachContainer, ExecContainer,
|
|
)
|
|
} else {
|
|
result = result.WithControls(StartContainer)
|
|
}
|
|
|
|
result = AddLabels(result, c.container.Config.Labels)
|
|
result = result.WithMetrics(c.metrics())
|
|
return result
|
|
}
|
|
|
|
// ExtractContainerIPs returns the list of container IPs given a Node from the Container topology.
|
|
func ExtractContainerIPs(nmd report.Node) []string {
|
|
v, _ := nmd.Sets.Lookup(ContainerIPs)
|
|
return []string(v)
|
|
}
|
|
|
|
// ExtractContainerIPsWithScopes returns the list of container IPs, prepended
|
|
// with scopes, given a Node from the Container topology.
|
|
func ExtractContainerIPsWithScopes(nmd report.Node) []string {
|
|
v, _ := nmd.Sets.Lookup(ContainerIPsWithScopes)
|
|
return []string(v)
|
|
}
|