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https://gitee.com/rainbond/Rainbond.git
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245 lines
5.1 KiB
Go
245 lines
5.1 KiB
Go
// RAINBOND, Application Management Platform
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// Copyright (C) 2014-2017 Goodrain Co., Ltd.
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version. For any non-GPL usage of Rainbond,
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// one or multiple Commercial Licenses authorized by Goodrain Co., Ltd.
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// must be obtained first.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package util
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import (
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"bufio"
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"fmt"
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"net"
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"os"
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"strings"
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)
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const (
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commentChar string = "#"
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//StartOfSection writ hosts start
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StartOfSection = "# Generate by Rainbond. DO NOT EDIT"
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//EndOfSection writ hosts end
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EndOfSection = "# End of Section"
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eol = "\n"
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)
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// HostsLine represents a single line in the hosts file.
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type HostsLine struct {
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IP string
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Hosts []string
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Raw string
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Err error
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}
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// NewHostsLine returns a new instance of ```HostsLine```.
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func NewHostsLine(raw string) HostsLine {
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fields := strings.Fields(raw)
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if len(fields) == 0 {
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return HostsLine{Raw: raw}
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}
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output := HostsLine{Raw: raw}
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if !output.IsComment() {
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rawIP := fields[0]
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if net.ParseIP(rawIP) == nil {
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output.Err = fmt.Errorf("Bad hosts line: %q", raw)
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}
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output.IP = rawIP
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output.Hosts = fields[1:]
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}
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return output
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}
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// IsComment returns ```true``` if the line is a comment.
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func (l HostsLine) IsComment() bool {
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trimLine := strings.TrimSpace(l.Raw)
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isComment := strings.HasPrefix(trimLine, commentChar)
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return isComment
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}
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// Hosts represents a hosts file.
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type Hosts struct {
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Path string
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Lines []HostsLine
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}
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// NewHosts return a new instance of ``Hosts``.
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func NewHosts(hostsFile string) (Hosts, error) {
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hosts := Hosts{Path: hostsFile}
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err := hosts.load()
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if err != nil {
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return hosts, err
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}
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return hosts, nil
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}
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// load the hosts file into ```l.Lines```.
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// ```Load()``` is called by ```NewHosts()``` and ```Hosts.Flush()``` so you
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// generally you won't need to call this yourself.
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func (h *Hosts) load() error {
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var lines []HostsLine
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file, err := os.Open(h.Path)
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if err != nil {
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return err
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}
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defer file.Close()
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scanner := bufio.NewScanner(file)
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for scanner.Scan() {
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line := NewHostsLine(scanner.Text())
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lines = append(lines, line)
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}
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if err := scanner.Err(); err != nil {
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return err
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}
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h.Lines = lines
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return nil
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}
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// Add an entry to the hosts file.
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func (h *Hosts) Add(ip string, hosts ...string) {
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position := h.getIPPosition(ip)
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if position == -1 {
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endLine := NewHostsLine(buildRawLine(ip, hosts))
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// Ip line is not in file, so we just append our new line.
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h.Lines = append(h.Lines, endLine)
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} else {
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// Otherwise, we replace the line in the correct position
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newHosts := h.Lines[position].Hosts
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for _, addHost := range hosts {
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if itemInSlice(addHost, newHosts) {
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continue
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}
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newHosts = append(newHosts, addHost)
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}
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endLine := NewHostsLine(buildRawLine(ip, newHosts))
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h.Lines[position] = endLine
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}
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}
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// AddLines adds entries to the hosts file.
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func (h *Hosts) AddLines(lines ...string) {
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for _, line := range lines {
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h.Lines = append(h.Lines, NewHostsLine(line))
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}
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}
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// Cleanup remove entries created by rainbond from the hosts file.
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func (h *Hosts) Cleanup() error {
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start := h.getStartPosition()
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if start == -1 {
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return nil
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}
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end := h.getEndPosition(start)
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if end == -1 {
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return fmt.Errorf("wrong hosts file, found start of section, but no end of section")
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}
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end += start + 1
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if end == len(h.Lines) {
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h.Lines = h.Lines[:start]
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return nil
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}
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pre := h.Lines[:start]
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post := h.Lines[end+1:]
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h.Lines = append(pre, post...)
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return nil
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}
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// Flush any changes made to hosts file.
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func (h Hosts) Flush() error {
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file, err := os.Create(h.Path)
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if err != nil {
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return err
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}
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w := bufio.NewWriter(file)
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for _, line := range h.Lines {
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_, _ = fmt.Fprintf(w, "%s%s", line.Raw, eol)
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}
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err = w.Flush()
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if err != nil {
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return err
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}
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return h.load()
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}
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func (h Hosts) getStartPosition() int {
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for i := range h.Lines {
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line := h.Lines[i]
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if line.Raw == StartOfSection {
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return i
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}
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}
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return -1
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}
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func (h Hosts) getEndPosition(startPos int) int {
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newLines := h.Lines[startPos+1:]
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for i := range newLines {
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line := newLines[i]
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if line.Raw == EndOfSection {
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return i
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}
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}
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return -1
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}
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func (h Hosts) getIPPosition(ip string) int {
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for i := range h.Lines {
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line := h.Lines[i]
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if !line.IsComment() && line.Raw != "" {
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if line.IP == ip {
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return i
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}
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}
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}
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return -1
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}
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func itemInSlice(item string, list []string) bool {
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for _, i := range list {
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if i == item {
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return true
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}
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}
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return false
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}
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func buildRawLine(ip string, hosts []string) string {
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output := ip
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for _, host := range hosts {
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output = fmt.Sprintf("%s %s", output, host)
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}
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return output
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}
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