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machine.go
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package cluster
import (
"fmt"
"strconv"
"strings"
"syscall"
"github.com/docker/docker/api/types/network"
"github.com/pkg/errors"
log "github.com/sirupsen/logrus"
"github.com/weaveworks/footloose/pkg/config"
"github.com/weaveworks/footloose/pkg/docker"
"github.com/weaveworks/footloose/pkg/exec"
"github.com/weaveworks/footloose/pkg/ignite"
)
// Machine is a single machine.
type Machine struct {
spec *config.Machine
// container name.
name string
// container hostname.
hostname string
// container ip.
ip string
runtimeNetworks []*RuntimeNetwork
// Fields that are cached from the docker daemon.
ports map[int]int
// maps containerPort -> hostPort.
}
// ContainerName is the name of the running container corresponding to this
// Machine.
func (m *Machine) ContainerName() string {
if m.IsIgnite() {
filter := fmt.Sprintf(`label=ignite.name=%s`, m.name)
cid, err := exec.ExecuteCommand("docker", "ps", "-q", "-f", filter)
if err != nil || len(cid) == 0 {
return m.name
}
return cid
}
return m.name
}
// Hostname is the machine hostname.
func (m *Machine) Hostname() string {
return m.hostname
}
// IsCreated returns if a machine is has been created. A created machine could
// either be running or stopped.
func (m *Machine) IsCreated() bool {
if m.IsIgnite() {
return ignite.IsCreated(m.name)
}
res, _ := docker.Inspect(m.name, "{{.Name}}")
if len(res) > 0 && len(res[0]) > 0 {
return true
}
return false
}
// IsStarted returns if a machine is currently started or not.
func (m *Machine) IsStarted() bool {
if m.IsIgnite() {
return ignite.IsStarted(m.name)
}
res, _ := docker.Inspect(m.name, "{{.State.Running}}")
parsed, _ := strconv.ParseBool(strings.Trim(res[0], `'`))
return parsed
}
// HostPort returns the host port corresponding to the given container port.
func (m *Machine) HostPort(containerPort int) (int, error) {
// Use the cached version first
if hostPort, ok := m.ports[containerPort]; ok {
return hostPort, nil
}
var hostPort int
// Handle Ignite VMs
if m.IsIgnite() {
// Retrieve the machine details
vm, err := ignite.PopulateMachineDetails(m.name)
if err != nil {
return -1, errors.Wrap(err, "failed to populate VM details")
}
// Find the host port for the given VM port
var found = false
for _, p := range vm.Spec.Network.Ports {
if int(p.VMPort) == containerPort {
hostPort = int(p.HostPort)
found = true
break
}
}
if !found {
return -1, fmt.Errorf("invalid VM port queried: %d", containerPort)
}
} else {
// retrieve the specific port mapping using docker inspect
lines, err := docker.Inspect(m.ContainerName(), fmt.Sprintf("{{(index (index .NetworkSettings.Ports \"%d/tcp\") 0).HostPort}}", containerPort))
if err != nil {
return -1, errors.Wrapf(err, "hostport: failed to inspect container: %v", lines)
}
if len(lines) != 1 {
return -1, errors.Errorf("hostport: should only be one line, got %d lines", len(lines))
}
port := strings.Replace(lines[0], "'", "", -1)
if hostPort, err = strconv.Atoi(port); err != nil {
return -1, errors.Wrap(err, "hostport: failed to parse string to int")
}
}
if m.ports == nil {
m.ports = make(map[int]int)
}
// Cache the result
m.ports[containerPort] = hostPort
return hostPort, nil
}
func (m *Machine) networks() ([]*RuntimeNetwork, error) {
if len(m.runtimeNetworks) != 0 {
return m.runtimeNetworks, nil
}
var networks map[string]*network.EndpointSettings
if err := docker.InspectObject(m.name, ".NetworkSettings.Networks", &networks); err != nil {
return nil, err
}
m.runtimeNetworks = NewRuntimeNetworks(networks)
return m.runtimeNetworks, nil
}
func (m *Machine) igniteStatus(s *MachineStatus) error {
vm, err := ignite.PopulateMachineDetails(m.name)
if err != nil {
return err
}
// Set Ports
var ports []port
for _, p := range vm.Spec.Network.Ports {
ports = append(ports, port{
Host: int(p.HostPort),
Guest: int(p.VMPort),
})
}
s.Ports = ports
if vm.Status.IpAddresses != nil && len(vm.Status.IpAddresses) > 0 {
m.ip = vm.Status.IpAddresses[0]
}
s.RuntimeNetworks = NewIgniteRuntimeNetwork(&vm.Status)
return nil
}
func (m *Machine) dockerStatus(s *MachineStatus) error {
var ports []port
if m.IsCreated() {
for _, v := range m.spec.PortMappings {
hPort, err := m.HostPort(int(v.ContainerPort))
if err != nil {
hPort = 0
}
p := port{
Host: hPort,
Guest: int(v.ContainerPort),
}
ports = append(ports, p)
}
}
if len(ports) < 1 {
for _, p := range m.spec.PortMappings {
ports = append(ports, port{Host: 0, Guest: int(p.ContainerPort)})
}
}
s.Ports = ports
s.RuntimeNetworks, _ = m.networks()
return nil
}
// Status returns the machine status.
func (m *Machine) Status() *MachineStatus {
s := MachineStatus{}
s.Container = m.ContainerName()
s.Image = m.spec.Image
s.Command = m.spec.Cmd
s.Spec = m.spec
s.Hostname = m.Hostname()
s.IP = m.ip
state := NotCreated
if m.IsCreated() {
state = Stopped
if m.IsStarted() {
state = Running
}
}
s.State = state
if m.IsIgnite() {
_ = m.igniteStatus(&s)
} else {
_ = m.dockerStatus(&s)
}
return &s
}
// Only check for Ignite prerequisites once
var igniteChecked bool
// IsIgnite returns if the backend is Ignite
func (m *Machine) IsIgnite() (b bool) {
b = m.spec.Backend == ignite.BackendName
if !igniteChecked && b {
if syscall.Getuid() != 0 {
log.Fatalf("Footloose needs to run as root to use the %q backend", ignite.BackendName)
}
ignite.CheckVersion()
igniteChecked = true
}
return b
}