forked from 3d0c/imagio
/
config.go
272 lines (214 loc) · 4.51 KB
/
config.go
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package config
import (
"encoding/json"
"errors"
"io/ioutil"
"log"
"regexp"
"strconv"
)
const (
CACHE_SIZE = int64(512)
FORMAT = "jpeg"
METHOD = 3
QUALITY = 80
ALPHA = 0.5
LISTEN_ON = "127.0.0.1:15900"
CACHE_SELF = "http://127.0.0.1:9100"
)
var defaultCfg string = `
{
"listen" : "127.0.0.1:15900",
"defaults" : {
"format" : "jpeg",
"method" : 3,
"quality" : 80,
"alpha" : 0.5
},
"source" : {
"http" : {
"root" : "",
"default" : true
},
"file" : {
"root" : "",
"defaut" : false
}
},
"groupcache" : {
"self" : "http://127.0.0.1:9100",
"peers" : [],
"size" : "512M"
}
}
`
type Source struct {
Root string `json:"root"`
Default bool `json:"default"`
}
type Config struct {
ListenOn string `json:"listen"`
Sources struct {
Http Source `json:"http"`
File Source `json:"file"`
} `json:"source"`
Defaults struct {
Format string `json:"format"`
Method int `json:"method"`
Quality int `json:"quality"`
Alpha float64 `json:"blend_alpha"`
} `json:"defaults"`
GroupCache struct {
Self string `json:"self"`
Peers []string `json:"peers"`
Size string `json:"size"`
} `json:"groupcache"`
Blend struct {
With string `json:"with"`
Mask string `json:"mask"`
Roi string `json:roi`
}
}
var cfgptr *Config
func Get() *Config {
var data []byte
if cfgptr != nil {
return cfgptr
}
cfgptr = &Config{}
data, err := ioutil.ReadFile("imagio.conf")
if err != nil {
data = []byte(defaultCfg)
}
err = json.Unmarshal(data, cfgptr)
if err != nil {
log.Println("Unable to read default config.", err)
}
return cfgptr
}
func (this *Config) DumpCfg() error {
b, err := json.MarshalIndent(this, "", " ")
if err != nil {
return errors.New("Unable to Marshal current config." + err.Error())
}
err = ioutil.WriteFile("imagio.conf", b, 0644)
if err != nil {
return errors.New("Unable to write 'imagio.conf'." + err.Error())
}
return nil
}
func (this *Config) Listen() string {
if this.ListenOn == "" {
return LISTEN_ON
}
return this.ListenOn
}
func (this *Config) Scheme() string {
if this.Sources.File.Default {
return "file"
}
return "http"
}
func (this *Config) Root(scheme string) (string, error) {
switch scheme {
case "file":
return this.RootFile()
break
case "http":
return this.RootHttp()
break
default:
if this.Sources.File.Default {
return this.RootFile()
}
}
return this.RootHttp()
}
func (this *Config) RootHttp() (string, error) {
return this.Sources.Http.Root, nil
}
func (this *Config) RootFile() (string, error) {
r := []rune(this.Sources.File.Root)
if len(r) == 0 {
return "", errors.New("Root for 'file source' sould be defined.")
}
if r[len(r)-1] != '/' {
r = append(r, '/')
}
return string(r), nil
}
func (this *Config) CacheSelf() string {
if this.GroupCache.Self != "" {
return this.GroupCache.Self
}
return CACHE_SELF
}
func (this *Config) CachePeers() []string {
this.GroupCache.Peers = append(this.GroupCache.Peers, this.CacheSelf())
return this.GroupCache.Peers
}
func (this *Config) CacheSize() int64 {
if this.GroupCache.Size == "" {
return CACHE_SIZE << 20
}
r := regexp.MustCompile("([0-9]+)(M|G)")
result := r.FindStringSubmatch(this.GroupCache.Size)
if len(result) != 3 {
log.Printf("Wrong size value '%v', using default.\n", result[2])
return CACHE_SIZE << 20
}
val, err := strconv.Atoi(result[1])
if err != nil {
log.Printf("Wrong size value '%v'. %v\n", result[1], err)
return CACHE_SIZE << 20
}
if result[2] == "G" {
return int64(val) << 30
}
if result[2] == "M" {
return int64(val) << 20
}
return CACHE_SIZE << 20
}
func (this *Config) Format() string {
if this.Defaults.Format == "" {
return FORMAT
}
return this.Defaults.Format
}
func (this *Config) Method() int {
if this.Defaults.Method == 0 {
return METHOD
}
return this.Defaults.Method
}
func (this *Config) Quality() int {
if this.Defaults.Quality == 0 {
return QUALITY
}
return this.Defaults.Quality
}
func (this *Config) Alpha() float64 {
if this.Defaults.Alpha == 0 {
return ALPHA
}
return this.Defaults.Alpha
}
func (this *Config) BlendWith(s string) string {
if s != "" {
return s
}
return this.Blend.With
}
func (this *Config) BlendMask(s string) string {
if s != "" {
return s
}
return this.Blend.Mask
}
func (this *Config) BlendRoi(s string) string {
if s != "" {
return s
}
return this.Blend.Roi
}