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Copy pathhosts.go
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190 lines (150 loc) · 3.27 KB
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Copy pathhosts.go
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190 lines (150 loc) · 3.27 KB
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// Copyright 2016 VMware, Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package etcconf
import (
"fmt"
"net"
"os"
"strings"
"sync"
log "github.com/Sirupsen/logrus"
)
type hostEntry struct {
IP net.IP
Hostnames []string
}
func (e *hostEntry) String() string {
return fmt.Sprintf("%s %s", e.IP, strings.Join(e.Hostnames, " "))
}
type Hosts interface {
Conf
SetHost(hostname string, ip net.IP)
RemoveHost(hostname string)
RemoveAll()
HostIP(hostname string) net.IP
}
type hosts struct {
sync.Mutex
EntryConsumer
hosts map[string]net.IP
dirty bool
path string
}
type hostsWalker struct {
entries []*hostEntry
i int
}
func (w *hostsWalker) HasNext() bool {
return w.i < len(w.entries)
}
func (w *hostsWalker) Next() string {
s := w.entries[w.i].String()
w.i++
return s
}
func NewHosts(path string) Hosts {
if path == "" {
path = hostsPath
}
return &hosts{
path: path,
hosts: make(map[string]net.IP),
}
}
func (h *hosts) ConsumeEntry(t string) error {
h.Lock()
defer h.Unlock()
fs := strings.Fields(t)
if len(fs) < 2 {
log.Warnf("ignoring incomplete line %q", t)
return nil
}
ip := net.ParseIP(fs[0])
if ip == nil {
log.Warnf("ignoring line %q due to invalid ip address", t)
return nil
}
for _, hs := range fs[1:] {
h.setHost(hs, ip)
}
return nil
}
func (h *hosts) Load() error {
h.Lock()
defer h.Unlock()
newHosts := &hosts{hosts: make(map[string]net.IP)}
if err := load(h.path, newHosts); err != nil {
return err
}
h.hosts = newHosts.hosts
h.dirty = false
return nil
}
func (h *hosts) Save() error {
h.Lock()
defer h.Unlock()
if !h.dirty {
log.Debugf("skipping writing file since there are no new entries")
return nil
}
var entries []*hostEntry
for host, ip := range h.hosts {
found := false
for _, e := range entries {
if e.IP.Equal(ip) {
e.Hostnames = append(e.Hostnames, host)
found = true
break
}
}
if !found {
entries = append(entries, &hostEntry{IP: ip, Hostnames: []string{host}})
}
}
if err := save(h.path, &hostsWalker{entries: entries}); err != nil {
return err
}
// make sure the file is readable
if err := os.Chmod(h.path, 0644); err != nil {
return err
}
h.dirty = false
return nil
}
func (h *hosts) SetHost(hostname string, ip net.IP) {
h.Lock()
defer h.Unlock()
h.setHost(hostname, ip)
}
func (h *hosts) setHost(hostname string, ip net.IP) {
h.hosts[hostname] = ip
h.dirty = true
}
func (h *hosts) RemoveHost(hostname string) {
h.Lock()
defer h.Unlock()
delete(h.hosts, hostname)
h.dirty = true
}
func (h *hosts) RemoveAll() {
h.Lock()
defer h.Unlock()
h.hosts = make(map[string]net.IP)
h.dirty = true
}
func (h *hosts) HostIP(hostname string) net.IP {
h.Lock()
defer h.Unlock()
return h.hosts[hostname]
}