137 lines
3.3 KiB
Go
137 lines
3.3 KiB
Go
package links
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import (
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"fmt"
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"github.com/dotcloud/docker/engine"
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"github.com/dotcloud/docker/nat"
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"path"
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"strings"
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)
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type Link struct {
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ParentIP string
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ChildIP string
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Name string
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ChildEnvironment []string
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Ports []nat.Port
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IsEnabled bool
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eng *engine.Engine
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}
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func NewLink(parentIP, childIP, name string, env []string, exposedPorts map[nat.Port]struct{}, eng *engine.Engine) (*Link, error) {
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var (
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i int
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ports = make([]nat.Port, len(exposedPorts))
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)
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for p := range exposedPorts {
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ports[i] = p
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i++
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}
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l := &Link{
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Name: name,
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ChildIP: childIP,
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ParentIP: parentIP,
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ChildEnvironment: env,
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Ports: ports,
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eng: eng,
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}
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return l, nil
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}
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func (l *Link) Alias() string {
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_, alias := path.Split(l.Name)
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return alias
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}
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func (l *Link) ToEnv() []string {
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env := []string{}
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alias := strings.ToUpper(l.Alias())
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if p := l.getDefaultPort(); p != nil {
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env = append(env, fmt.Sprintf("%s_PORT=%s://%s:%s", alias, p.Proto(), l.ChildIP, p.Port()))
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}
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// Load exposed ports into the environment
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for _, p := range l.Ports {
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env = append(env, fmt.Sprintf("%s_PORT_%s_%s=%s://%s:%s", alias, p.Port(), strings.ToUpper(p.Proto()), p.Proto(), l.ChildIP, p.Port()))
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env = append(env, fmt.Sprintf("%s_PORT_%s_%s_ADDR=%s", alias, p.Port(), strings.ToUpper(p.Proto()), l.ChildIP))
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env = append(env, fmt.Sprintf("%s_PORT_%s_%s_PORT=%s", alias, p.Port(), strings.ToUpper(p.Proto()), p.Port()))
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env = append(env, fmt.Sprintf("%s_PORT_%s_%s_PROTO=%s", alias, p.Port(), strings.ToUpper(p.Proto()), p.Proto()))
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}
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// Load the linked container's name into the environment
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env = append(env, fmt.Sprintf("%s_NAME=%s", alias, l.Name))
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if l.ChildEnvironment != nil {
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for _, v := range l.ChildEnvironment {
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parts := strings.Split(v, "=")
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if len(parts) != 2 {
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continue
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}
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// Ignore a few variables that are added during docker build (and not really relevant to linked containers)
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if parts[0] == "HOME" || parts[0] == "PATH" {
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continue
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}
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env = append(env, fmt.Sprintf("%s_ENV_%s=%s", alias, parts[0], parts[1]))
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}
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}
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return env
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}
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// Default port rules
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func (l *Link) getDefaultPort() *nat.Port {
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var p nat.Port
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i := len(l.Ports)
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if i == 0 {
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return nil
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} else if i > 1 {
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nat.Sort(l.Ports, func(ip, jp nat.Port) bool {
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// If the two ports have the same number, tcp takes priority
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// Sort in desc order
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return ip.Int() < jp.Int() || (ip.Int() == jp.Int() && strings.ToLower(ip.Proto()) == "tcp")
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})
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}
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p = l.Ports[0]
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return &p
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}
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func (l *Link) Enable() error {
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if err := l.toggle("-I", false); err != nil {
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return err
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}
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l.IsEnabled = true
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return nil
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}
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func (l *Link) Disable() {
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// We do not care about errors here because the link may not
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// exist in iptables
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l.toggle("-D", true)
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l.IsEnabled = false
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}
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func (l *Link) toggle(action string, ignoreErrors bool) error {
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job := l.eng.Job("link", action)
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job.Setenv("ParentIP", l.ParentIP)
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job.Setenv("ChildIP", l.ChildIP)
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job.SetenvBool("IgnoreErrors", ignoreErrors)
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out := make([]string, len(l.Ports))
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for i, p := range l.Ports {
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out[i] = fmt.Sprintf("%s/%s", p.Port(), p.Proto())
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}
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job.SetenvList("Ports", out)
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if err := job.Run(); err != nil {
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// TODO: get ouput from job
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return err
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}
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return nil
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}
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