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config.go
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config.go
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// Copyright (c) 2014-2017 Ludovic Fauvet
// Licensed under the MIT license
package config
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"sync"
"github.com/etix/mirrorbits/core"
"github.com/op/go-logging"
"gopkg.in/yaml.v2"
)
var (
// TEMPLATES_PATH is set at compile time
TEMPLATES_PATH = ""
)
var (
log = logging.MustGetLogger("main")
config *Configuration
configMutex sync.RWMutex
subscribers []chan bool
subscribersLock sync.RWMutex
)
func defaultConfig() Configuration {
return Configuration{
Repository: "",
Templates: TEMPLATES_PATH,
LocalJSPath: "",
OutputMode: "auto",
ListenAddress: ":8080",
Gzip: false,
RedisAddress: "127.0.0.1:6379",
RedisPassword: "",
RedisDB: 0,
LogDir: "",
TraceFileLocation: "",
GeoipDatabasePath: "/usr/share/GeoIP/",
ConcurrentSync: 5,
ScanInterval: 30,
CheckInterval: 1,
RepositoryScanInterval: 5,
MaxLinkHeaders: 10,
Hashes: hashing{
SHA1: false,
SHA256: true,
MD5: false,
},
DisallowRedirects: false,
WeightDistributionRange: 1.5,
DisableOnMissingFile: false,
RPCListenAddress: "localhost:3390",
RPCPassword: "",
}
}
// Configuration contains all the option available in the yaml file
type Configuration struct {
Repository string `yaml:"Repository"`
Templates string `yaml:"Templates"`
LocalJSPath string `yaml:"LocalJSPath"`
OutputMode string `yaml:"OutputMode"`
ListenAddress string `yaml:"ListenAddress"`
Gzip bool `yaml:"Gzip"`
RedisAddress string `yaml:"RedisAddress"`
RedisPassword string `yaml:"RedisPassword"`
RedisDB int `yaml:"RedisDB"`
LogDir string `yaml:"LogDir"`
TraceFileLocation string `yaml:"TraceFileLocation"`
GeoipDatabasePath string `yaml:"GeoipDatabasePath"`
ConcurrentSync int `yaml:"ConcurrentSync"`
ScanInterval int `yaml:"ScanInterval"`
CheckInterval int `yaml:"CheckInterval"`
RepositoryScanInterval int `yaml:"RepositoryScanInterval"`
MaxLinkHeaders int `yaml:"MaxLinkHeaders"`
Hashes hashing `yaml:"Hashes"`
DisallowRedirects bool `yaml:"DisallowRedirects"`
WeightDistributionRange float32 `yaml:"WeightDistributionRange"`
DisableOnMissingFile bool `yaml:"DisableOnMissingFile"`
Fallbacks []fallback `yaml:"Fallbacks"`
RedisSentinelMasterName string `yaml:"RedisSentinelMasterName"`
RedisSentinels []sentinels `yaml:"RedisSentinels"`
RPCListenAddress string `yaml:"RPCListenAddress"`
RPCPassword string `yaml:"RPCPassword"`
}
type fallback struct {
URL string `yaml:"URL"`
CountryCode string `yaml:"CountryCode"`
ContinentCode string `yaml:"ContinentCode"`
}
type sentinels struct {
Host string `yaml:"Host"`
}
type hashing struct {
SHA1 bool `yaml:"SHA1"`
SHA256 bool `yaml:"SHA256"`
MD5 bool `yaml:"MD5"`
}
// LoadConfig loads the configuration file if it has not yet been loaded
func LoadConfig() {
if config != nil {
return
}
err := ReloadConfig()
if err != nil {
log.Fatal(err)
}
}
// ReloadConfig reloads the configuration file and update it globally
func ReloadConfig() error {
if core.ConfigFile == "" {
if fileExists("/etc/mirrorbits.conf") {
core.ConfigFile = "/etc/mirrorbits.conf"
}
}
content, err := ioutil.ReadFile(core.ConfigFile)
if err != nil {
fmt.Println("Configuration could not be found.\n\tUse -config <path>")
os.Exit(1)
}
if os.Getenv("DEBUG") != "" {
fmt.Println("Reading configuration from", core.ConfigFile)
}
c := defaultConfig()
// Overload the default configuration with the user's one
err = yaml.Unmarshal(content, &c)
if err != nil {
return fmt.Errorf("%s in %s", err, core.ConfigFile)
}
// Sanitize
if c.WeightDistributionRange <= 0 {
return fmt.Errorf("WeightDistributionRange must be > 0")
}
if !isInSlice(c.OutputMode, []string{"auto", "json", "redirect"}) {
return fmt.Errorf("Config: outputMode can only be set to 'auto', 'json' or 'redirect'")
}
if c.Repository == "" {
return fmt.Errorf("Path to local repository not configured (see mirrorbits.conf)")
}
c.Repository, err = filepath.Abs(c.Repository)
if err != nil {
return fmt.Errorf("Invalid local repository path: %s", err)
}
if c.RepositoryScanInterval < 0 {
c.RepositoryScanInterval = 0
}
if config != nil &&
(c.RedisAddress != config.RedisAddress ||
c.RedisPassword != config.RedisPassword ||
!testSentinelsEq(c.RedisSentinels, config.RedisSentinels)) {
// TODO reload redis connections
// Currently established connections will be updated only in case of disconnection
}
// Lock the pointer during the swap
configMutex.Lock()
config = &c
configMutex.Unlock()
// Notify all subscribers that the configuration has been reloaded
notifySubscribers()
return nil
}
// GetConfig returns a pointer to a configuration object
// FIXME reading from the pointer could cause a race!
func GetConfig() *Configuration {
configMutex.RLock()
defer configMutex.RUnlock()
if config == nil {
panic("Configuration not loaded")
}
return config
}
// SetConfiguration is only used for testing purpose
func SetConfiguration(c *Configuration) {
config = c
}
// SubscribeConfig allows subscribers to get notified when
// the configuration is updated.
func SubscribeConfig(subscriber chan bool) {
subscribersLock.Lock()
defer subscribersLock.Unlock()
subscribers = append(subscribers, subscriber)
}
func notifySubscribers() {
subscribersLock.RLock()
defer subscribersLock.RUnlock()
for _, subscriber := range subscribers {
select {
case subscriber <- true:
default:
// Don't block if the subscriber is unavailable
// and discard the message.
}
}
}
func fileExists(filename string) bool {
_, err := os.Stat(filename)
return err == nil
}
func testSentinelsEq(a, b []sentinels) bool {
if len(a) != len(b) {
return false
}
for i := range a {
if a[i].Host != b[i].Host {
return false
}
}
return true
}
//DUPLICATE
func isInSlice(a string, list []string) bool {
for _, b := range list {
if b == a {
return true
}
}
return false
}