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users.go
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users.go
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package settings
import (
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"regexp"
"sync"
"github.com/fsnotify/fsnotify"
"github.com/codaul/volume/share/cio"
)
type Users struct {
sync.RWMutex
inner map[string]*User
}
func NewUsers() *Users {
return &Users{inner: map[string]*User{}}
}
// Len returns the numbers of users
func (u *Users) Len() int {
u.RLock()
l := len(u.inner)
u.RUnlock()
return l
}
// Get user from the index by key
func (u *Users) Get(key string) (*User, bool) {
u.RLock()
user, found := u.inner[key]
u.RUnlock()
return user, found
}
// Set a users into the list by specific key
func (u *Users) Set(key string, user *User) {
u.Lock()
u.inner[key] = user
u.Unlock()
}
// Del ete a users from the list
func (u *Users) Del(key string) {
u.Lock()
delete(u.inner, key)
u.Unlock()
}
// AddUser adds a users to the set
func (u *Users) AddUser(user *User) {
u.Set(user.Name, user)
}
// Reset all users to the given set,
// Use nil to remove all.
func (u *Users) Reset(users []*User) {
m := map[string]*User{}
for _, u := range users {
m[u.Name] = u
}
u.Lock()
u.inner = m
u.Unlock()
}
// UserIndex is a reloadable user source
type UserIndex struct {
*cio.Logger
*Users
configFile string
}
// NewUserIndex creates a source for users
func NewUserIndex(logger *cio.Logger) *UserIndex {
return &UserIndex{
Logger: logger.Fork("users"),
Users: NewUsers(),
}
}
// LoadUsers is responsible for loading users from a file
func (u *UserIndex) LoadUsers(configFile string) error {
u.configFile = configFile
u.Infof("Loading configuration file %s", configFile)
if err := u.loadUserIndex(); err != nil {
return err
}
if err := u.addWatchEvents(); err != nil {
return err
}
return nil
}
// watchEvents is responsible for watching for updates to the file and reloading
func (u *UserIndex) addWatchEvents() error {
watcher, err := fsnotify.NewWatcher()
if err != nil {
return err
}
if err := watcher.Add(u.configFile); err != nil {
return err
}
go func() {
for e := range watcher.Events {
if e.Op&fsnotify.Write != fsnotify.Write {
continue
}
if err := u.loadUserIndex(); err != nil {
u.Infof("Failed to reload the users configuration: %s", err)
} else {
u.Debugf("Users configuration successfully reloaded from: %s", u.configFile)
}
}
}()
return nil
}
// loadUserIndex is responsible for loading the users configuration
func (u *UserIndex) loadUserIndex() error {
if u.configFile == "" {
return errors.New("configuration file not set")
}
b, err := ioutil.ReadFile(u.configFile)
if err != nil {
return fmt.Errorf("Failed to read auth file: %s, error: %s", u.configFile, err)
}
var raw map[string][]string
if err := json.Unmarshal(b, &raw); err != nil {
return errors.New("Invalid JSON: " + err.Error())
}
users := []*User{}
for auth, remotes := range raw {
user := &User{}
user.Name, user.Pass = ParseAuth(auth)
if user.Name == "" {
return errors.New("Invalid user:pass string")
}
for _, r := range remotes {
if r == "" || r == "*" {
user.Addrs = append(user.Addrs, UserAllowAll)
} else {
re, err := regexp.Compile(r)
if err != nil {
return errors.New("Invalid address regex")
}
user.Addrs = append(user.Addrs, re)
}
}
users = append(users, user)
}
//swap
u.Reset(users)
return nil
}