/
server.go
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/
server.go
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// Copyright (c) 2012-2014 José Carlos Nieto, https://menteslibres.net/xiam
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
package main
import (
"errors"
"fmt"
//"github.com/howeyc/fsnotify"
"log"
"net/http"
"os"
"strings"
"menteslibres.net/gosexy/to"
"menteslibres.net/gosexy/yaml"
"menteslibres.net/luminos/host"
"menteslibres.net/luminos/watcher"
)
// Map of hosts.
var hosts map[string]*host.Host
// File watcher.
var watch *watcher.Watcher
type server struct {
}
func init() {
// Allocating map.
hosts = make(map[string]*host.Host)
}
// Finds the appropriate hosts for a request.
func route(req *http.Request) *host.Host {
// Request's hostname.
name := req.Host
// Removing the port part of the host.
if strings.Contains(name, ":") {
name = name[0:strings.Index(name, ":")]
}
// Host and path.
path := name + req.URL.Path
// Searching for the host that best matches this request.
match := ""
for key := range hosts {
lkey := len(key)
if key[0] == '/' {
if lkey <= len(req.URL.Path) {
if req.URL.Path[0:lkey] == key {
match = key
}
}
}
if lkey <= len(path) {
if path[0:lkey] == key {
match = key
}
}
}
// No host matched, let's use the default host.
if match == "" {
log.Printf("Path %v could not match any route, falling back to the default.\n", path)
match = "default"
}
// Let's verify and return the host.
if _, ok := hosts[match]; !ok {
// Host was not found.
log.Printf("Request for unknown host: %s\n", req.Host)
return nil
}
return hosts[match]
}
// Routes a request and lets the host handle it.
func (s server) ServeHTTP(wri http.ResponseWriter, req *http.Request) {
r := route(req)
if r != nil {
r.ServeHTTP(wri, req)
} else {
log.Printf("Failed to serve host %s.\n", req.Host)
http.Error(wri, "Not found", http.StatusNotFound)
}
}
// Loads settings
func loadSettings(file string) (*yaml.Yaml, error) {
var entries map[interface{}]interface{}
var ok bool
// Trying to read settings from file.
y, err := yaml.Open(file)
if err != nil {
return nil, err
}
// Loading and verifying host entries
if entries, ok = y.Get("hosts").(map[interface{}]interface{}); ok == false {
return nil, errors.New("Missing \"hosts\" entry.")
}
h := map[string]*host.Host{}
// Populating host entries.
for key := range entries {
name := to.String(key)
path := to.String(entries[name])
info, err := os.Stat(path)
if err != nil {
return nil, fmt.Errorf("Failed to validate host %s: %q.", name, err)
}
if info.IsDir() == false {
return nil, fmt.Errorf("Host %s does not point to a directory.", name)
}
h[name], err = host.New(name, path)
if err != nil {
return nil, fmt.Errorf("Failed to initialize host %s: %q.", name, err)
}
}
for name := range hosts {
hosts[name].Close()
}
hosts = h
if _, ok := hosts["default"]; ok == false {
log.Printf("Warning: default host was not provided.\n")
}
return y, nil
}
func settingsWatcher() error {
var err error
/*
// Watching settings file for changes.
// Was not properly returning events on OSX.
// https://github.com/howeyc/fsnotify/issues/34
watcher, err := fsnotify.NewWatcher()
if err == nil {
defer watcher.Close()
go func() {
for {
select {
case ev := <-watcher.Event:
if ev == nil {
return
}
if ev.IsModify() {
log.Printf("Trying to reload settings file %s...\n", ev.Name)
y, err := loadSettings(ev.Name)
if err != nil {
log.Printf("Error loading settings file %s: %q\n", ev.Name, err)
} else {
settings = y
}
} else if ev.IsDelete() {
watcher.RemoveWatch(ev.Name)
watcher.Watch(ev.Name)
}
case err := <-watcher.Error:
log.Printf("Watcher error: %q\n", err)
}
}
}()
watcher.Watch(settingsFile)
}
*/
// (Stupid) time based file modification watcher.
watch, err = watcher.New()
if err == nil {
go func() {
defer watch.Close()
for {
select {
case ev := <-watch.Event:
if ev.IsModify() {
y, err := loadSettings(ev.Name)
if err != nil {
log.Printf("Error loading settings file %s: %q\n", ev.Name, err)
} else {
log.Printf("Reloading settings file %s.\n", ev.Name)
settings = y
}
}
}
}
}()
}
return err
}