use viper config

engine/config.go

@@ -1,16 +1,13 @@
 package engine
 
 import (
-	"bytes"
-	"encoding/json"
 	"errors"
-	"io/ioutil"
 	"log"
-	"os"
 	"reflect"
 	"strings"
 
 	"github.com/c2h5oh/datasize"
+	"github.com/spf13/viper"
 	"golang.org/x/time/rate"
 )
 
@@ -97,25 +94,21 @@ func (c *Config) Validate(nc *Config) uint8 {
 
 	return status
 }
-
-func (c *Config) SaveConfigFile(configPath string) error {
-	b, err := json.MarshalIndent(&c, "", "  ")
-	if err != nil {
-		return err
-	}
-
-	ob, err := ioutil.ReadFile(configPath)
-	if err != nil {
-		if !os.IsNotExist(err) {
-			return err
-		}
-	} else {
-		if bytes.Compare(b, ob) == 0 {
-			return nil
+func (c *Config) SyncViper(nc Config) error {
+	cv := reflect.ValueOf(*c)
+	nv := reflect.ValueOf(nc)
+	typeOfC := cv.Type()
+	for i := 0; i < typeOfC.NumField(); i++ {
+		if cv.Field(i).Interface() != nv.Field(i).Interface() {
+			name := typeOfC.Field(i).Name
+			oval := cv.Field(i).Interface()
+			val := nv.Field(i).Interface()
+			viper.Set(name, val)
+			log.Println("config updated ", name, ": ", oval, " -> ", val)
 		}
 	}
 
-	return ioutil.WriteFile(configPath, b, 0644)
+	return viper.WriteConfigAs(viper.ConfigFileUsed())
 }
 
 func rateLimiter(rstr string) (*rate.Limiter, error) {

go.mod

@@ -6,29 +6,21 @@ require (
 	github.com/NYTimes/gziphandler v1.1.1
 	github.com/anacrolix/log v0.5.0
 	github.com/anacrolix/torrent v1.11.0
-	github.com/andrew-d/go-termutil v0.0.0-20150726205930-009166a695a2 // indirect
 	github.com/boypt/scraper v1.0.2
 	github.com/c2h5oh/datasize v0.0.0-20171227191756-4eba002a5eae
 	github.com/elazarl/go-bindata-assetfs v1.0.0
-	github.com/elithrar/simple-scrypt v1.3.0 // indirect
-	github.com/gorilla/websocket v1.4.1 // indirect
-	github.com/jpillora/ansi v1.0.0 // indirect
 	github.com/jpillora/archive v0.0.0-20160301031048-e0b3681851f1
 	github.com/jpillora/cloud-torrent v0.0.0-00010101000000-000000000000
 	github.com/jpillora/cookieauth v0.0.0-20190219222732-2ae29b2a9c76
-	github.com/jpillora/eventsource v0.0.0-20170920003432-7ed8c999e167 // indirect
 	github.com/jpillora/opts v1.1.0
 	github.com/jpillora/requestlog v0.0.0-20181015073026-df8817be5f82
-	github.com/jpillora/sizestr v0.0.0-20160130011556-e2ea2fa42fb9 // indirect
 	github.com/jpillora/velox v0.0.0-20180825063758-42845d323220
-	github.com/mattbaird/jsonpatch v0.0.0-20171005235357-81af80346b1a // indirect
 	github.com/mmcdole/gofeed v1.0.0-beta2
-	github.com/mmcdole/goxpp v0.0.0-20181012175147-0068e33feabf // indirect
 	github.com/pkg/errors v0.8.1
 	github.com/radovskyb/watcher v1.0.6
 	github.com/shirou/gopsutil v2.18.12+incompatible
 	github.com/skratchdot/open-golang v0.0.0-20190402232053-79abb63cd66e
-	github.com/tomasen/realip v0.0.0-20180522021738-f0c99a92ddce // indirect
+	github.com/spf13/viper v1.6.1
 	golang.org/x/time v0.0.0-20191024005414-555d28b269f0
 )