141 lines
4.2 KiB
Go
141 lines
4.2 KiB
Go
package links // import "github.com/docker/docker/daemon/links"
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import (
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"fmt"
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"path"
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"strings"
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"github.com/docker/go-connections/nat"
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)
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// Link struct holds information about parent/child linked container
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type Link struct {
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// Parent container IP address
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ParentIP string
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// Child container IP address
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ChildIP string
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// Link name
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Name string
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// Child environments variables
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ChildEnvironment []string
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// Child exposed ports
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Ports []nat.Port
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}
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// NewLink initializes a new Link struct with the provided options.
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func NewLink(parentIP, childIP, name string, env []string, exposedPorts map[nat.Port]struct{}) *Link {
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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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return &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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}
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}
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// ToEnv creates a string's slice containing child container information in
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// the form of environment variables which will be later exported on container
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// startup.
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func (l *Link) ToEnv() []string {
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env := []string{}
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_, n := path.Split(l.Name)
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alias := strings.ReplaceAll(strings.ToUpper(n), "-", "_")
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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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// sort the ports so that we can bulk the continuous ports together
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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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for i := 0; i < len(l.Ports); {
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p := l.Ports[i]
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j := nextContiguous(l.Ports, p.Int(), i)
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if j > i+1 {
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env = append(env, fmt.Sprintf("%s_PORT_%s_%s_START=%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_PROTO=%s", alias, p.Port(), strings.ToUpper(p.Proto()), p.Proto()))
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env = append(env, fmt.Sprintf("%s_PORT_%s_%s_PORT_START=%s", alias, p.Port(), strings.ToUpper(p.Proto()), p.Port()))
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q := l.Ports[j]
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env = append(env, fmt.Sprintf("%s_PORT_%s_%s_END=%s://%s:%s", alias, p.Port(), strings.ToUpper(q.Proto()), q.Proto(), l.ChildIP, q.Port()))
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env = append(env, fmt.Sprintf("%s_PORT_%s_%s_PORT_END=%s", alias, p.Port(), strings.ToUpper(q.Proto()), q.Port()))
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i = j + 1
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continue
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} else {
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i++
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}
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}
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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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name, val, ok := strings.Cut(v, "=")
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if !ok {
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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 name == "HOME" || name == "PATH" {
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continue
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}
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env = append(env, fmt.Sprintf("%s_ENV_%s=%s", alias, name, val))
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}
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}
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return env
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}
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func nextContiguous(ports []nat.Port, value int, index int) int {
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if index+1 == len(ports) {
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return index
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}
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for i := index + 1; i < len(ports); i++ {
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if ports[i].Int() > value+1 {
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return i - 1
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}
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value++
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}
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return len(ports) - 1
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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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