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91 lines
2.6 KiB
Go
91 lines
2.6 KiB
Go
package daemon // import "github.com/docker/docker/daemon"
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import (
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"sync"
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"github.com/docker/docker/container"
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)
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// linkIndex stores link relationships between containers, including their specified alias
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// The alias is the name the parent uses to reference the child
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type linkIndex struct {
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// idx maps a parent->alias->child relationship
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idx map[*container.Container]map[string]*container.Container
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// childIdx maps child->parent->aliases
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childIdx map[*container.Container]map[*container.Container]map[string]struct{}
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mu sync.Mutex
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}
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func newLinkIndex() *linkIndex {
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return &linkIndex{
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idx: make(map[*container.Container]map[string]*container.Container),
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childIdx: make(map[*container.Container]map[*container.Container]map[string]struct{}),
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}
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}
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// link adds indexes for the passed in parent/child/alias relationships
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func (l *linkIndex) link(parent, child *container.Container, alias string) {
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l.mu.Lock()
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if l.idx[parent] == nil {
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l.idx[parent] = make(map[string]*container.Container)
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}
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l.idx[parent][alias] = child
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if l.childIdx[child] == nil {
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l.childIdx[child] = make(map[*container.Container]map[string]struct{})
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}
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if l.childIdx[child][parent] == nil {
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l.childIdx[child][parent] = make(map[string]struct{})
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}
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l.childIdx[child][parent][alias] = struct{}{}
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l.mu.Unlock()
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}
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// unlink removes the requested alias for the given parent/child
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func (l *linkIndex) unlink(alias string, child, parent *container.Container) {
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l.mu.Lock()
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delete(l.idx[parent], alias)
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delete(l.childIdx[child], parent)
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l.mu.Unlock()
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}
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// children maps all the aliases-> children for the passed in parent
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// aliases here are the aliases the parent uses to refer to the child
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func (l *linkIndex) children(parent *container.Container) map[string]*container.Container {
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l.mu.Lock()
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children := l.idx[parent]
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l.mu.Unlock()
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return children
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}
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// parents maps all the aliases->parent for the passed in child
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// aliases here are the aliases the parents use to refer to the child
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func (l *linkIndex) parents(child *container.Container) map[string]*container.Container {
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l.mu.Lock()
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parents := make(map[string]*container.Container)
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for parent, aliases := range l.childIdx[child] {
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for alias := range aliases {
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parents[alias] = parent
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}
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}
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l.mu.Unlock()
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return parents
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}
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// delete deletes all link relationships referencing this container
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func (l *linkIndex) delete(container *container.Container) []string {
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l.mu.Lock()
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var aliases []string
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for alias, child := range l.idx[container] {
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aliases = append(aliases, alias)
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delete(l.childIdx[child], container)
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}
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delete(l.idx, container)
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delete(l.childIdx, container)
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l.mu.Unlock()
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return aliases
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}
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