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moby--moby/pkg/discovery/entry.go
Daniel Nephin 4f0d95fa6e Add canonical import comment
Signed-off-by: Daniel Nephin <dnephin@docker.com>
2018-02-05 16:51:57 -05:00

94 lines
1.9 KiB
Go

package discovery // import "github.com/docker/docker/pkg/discovery"
import "net"
// NewEntry creates a new entry.
func NewEntry(url string) (*Entry, error) {
host, port, err := net.SplitHostPort(url)
if err != nil {
return nil, err
}
return &Entry{host, port}, nil
}
// An Entry represents a host.
type Entry struct {
Host string
Port string
}
// Equals returns true if cmp contains the same data.
func (e *Entry) Equals(cmp *Entry) bool {
return e.Host == cmp.Host && e.Port == cmp.Port
}
// String returns the string form of an entry.
func (e *Entry) String() string {
return net.JoinHostPort(e.Host, e.Port)
}
// Entries is a list of *Entry with some helpers.
type Entries []*Entry
// Equals returns true if cmp contains the same data.
func (e Entries) Equals(cmp Entries) bool {
// Check if the file has really changed.
if len(e) != len(cmp) {
return false
}
for i := range e {
if !e[i].Equals(cmp[i]) {
return false
}
}
return true
}
// Contains returns true if the Entries contain a given Entry.
func (e Entries) Contains(entry *Entry) bool {
for _, curr := range e {
if curr.Equals(entry) {
return true
}
}
return false
}
// Diff compares two entries and returns the added and removed entries.
func (e Entries) Diff(cmp Entries) (Entries, Entries) {
added := Entries{}
for _, entry := range cmp {
if !e.Contains(entry) {
added = append(added, entry)
}
}
removed := Entries{}
for _, entry := range e {
if !cmp.Contains(entry) {
removed = append(removed, entry)
}
}
return added, removed
}
// CreateEntries returns an array of entries based on the given addresses.
func CreateEntries(addrs []string) (Entries, error) {
entries := Entries{}
if addrs == nil {
return entries, nil
}
for _, addr := range addrs {
if len(addr) == 0 {
continue
}
entry, err := NewEntry(addr)
if err != nil {
return nil, err
}
entries = append(entries, entry)
}
return entries, nil
}