feat: read config from environment

bootstrap/conf.go

@@ -3,6 +3,7 @@ package bootstrap
 import (
 	"github.com/Xhofe/alist/conf"
 	"github.com/Xhofe/alist/utils"
+	"github.com/caarlos0/env/v6"
 	log "github.com/sirupsen/logrus"
 	"io/ioutil"
 	"os"
@@ -42,8 +43,18 @@ func InitConf() {
 			log.Fatalf("update config struct error: %s", err.Error())
 		}
 	}
+	if !conf.Conf.Force {
+		confFromEnv()
+	}
 	err := os.MkdirAll(conf.Conf.TempDir, 0700)
 	if err != nil {
 		log.Fatalf("create temp dir error: %s", err.Error())
 	}
+	log.Debugf("config: %+v", conf.Conf)
+}
+
+func confFromEnv() {
+	if err := env.Parse(conf.Conf); err != nil {
+		log.Fatalf("load config from env error: %s", err.Error())
+	}
 }

conf/config.go

@@ -1,36 +1,37 @@
 package conf
 
 type Database struct {
-	Type        string `json:"type"`
-	User        string `json:"user"`
-	Password    string `json:"password"`
-	Host        string `json:"host"`
-	Port        int    `json:"port"`
-	Name        string `json:"name"`
-	TablePrefix string `json:"table_prefix"`
-	DBFile      string `json:"db_file"`
-	SslMode     string `json:"ssl_mode"`
+	Type        string `json:"type" env:"A_LIST_DB_TYPE"`
+	User        string `json:"user" env:"A_LIST_DB_USER"`
+	Password    string `json:"password" env:"A_LIST_DB_PASS"`
+	Host        string `json:"host" env:"A_LIST_DB_HOST"`
+	Port        int    `json:"port" env:"A_LIST_DB_PORT"`
+	Name        string `json:"name" env:"A_LIST_DB_NAME"`
+	TablePrefix string `json:"table_prefix" env:"A_LIST_DB_TABLE_PREFIX"`
+	DBFile      string `json:"db_file" env:"A_LIST_DB_FILE"`
+	SslMode     string `json:"ssl_mode" env:"A_LIST_SLL_MODE"`
 }
 
 type Scheme struct {
-	Https    bool   `json:"https"`
-	CertFile string `json:"cert_file"`
-	KeyFile  string `json:"key_file"`
+	Https    bool   `json:"https" env:"A_LIST_HTTPS"`
+	CertFile string `json:"cert_file" env:"A_LIST_CERT"`
+	KeyFile  string `json:"key_file" env:"A_LIST_KEY"`
 }
 
 type CacheConfig struct {
-	Expiration      int64 `json:"expiration"`
-	CleanupInterval int64 `json:"cleanup_interval"`
+	Expiration      int64 `json:"expiration" env:"A_LIST_DB_EXPIRATION"`
+	CleanupInterval int64 `json:"cleanup_interval" env:"A_LIST_CLEANUP_INTERVAL"`
 }
 
 type Config struct {
-	Address  string      `json:"address"`
-	Port     int         `json:"port"`
-	Assets   string      `json:"assets"`
+	Force    bool        `json:"force"`
+	Address  string      `json:"address" env:"A_LIST_ADDR"`
+	Port     int         `json:"port" env:"A_LIST_PORT"`
+	Assets   string      `json:"assets" env:"A_LIST_ASSETS"`
 	Database Database    `json:"database"`
 	Scheme   Scheme      `json:"scheme"`
 	Cache    CacheConfig `json:"cache"`
-	TempDir  string      `json:"temp_dir"`
+	TempDir  string      `json:"temp_dir" env:"A_LIST_TEMP_DIR"`
 }
 
 func DefaultConfig() *Config {

go.mod

@@ -4,6 +4,7 @@ go 1.17
 
 require (
 	github.com/aws/aws-sdk-go v1.27.0
+	github.com/caarlos0/env/v6 v6.9.1
 	github.com/eko/gocache/v2 v2.1.0
 	github.com/gin-contrib/cors v1.3.1
 	github.com/gin-gonic/gin v1.7.4
@@ -25,7 +26,7 @@ require (
 
 require (
 	github.com/baiyubin/aliyun-sts-go-sdk v0.0.0-20180326062324-cfa1a18b161f // indirect
-	github.com/fatih/color v1.13.0 // indirect
+	github.com/fatih/color v1.13.0
 	github.com/mattn/go-colorable v0.1.9 // indirect
 	golang.org/x/time v0.0.0-20191024005414-555d28b269f0 // indirect
 )

go.sum

@@ -43,6 +43,8 @@ github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6r
 github.com/bgentry/speakeasy v0.1.0/go.mod h1:+zsyZBPWlz7T6j88CTgSN5bM796AkVf0kBD4zp0CCIs=
 github.com/bradfitz/gomemcache v0.0.0-20190913173617-a41fca850d0b h1:L/QXpzIa3pOvUGt1D1lA5KjYhPBAN/3iWdP7xeFS9F0=
 github.com/bradfitz/gomemcache v0.0.0-20190913173617-a41fca850d0b/go.mod h1:H0wQNHz2YrLsuXOZozoeDmnHXkNCRmMW0gwFWDfEZDA=
+github.com/caarlos0/env/v6 v6.9.1 h1:zOkkjM0F6ltnQ5eBX6IPI41UP/KDGEK7rRPwGCNos8k=
+github.com/caarlos0/env/v6 v6.9.1/go.mod h1:hvp/ryKXKipEkcuYjs9mI4bBCg+UI0Yhgm5Zu0ddvwc=
 github.com/casbin/casbin/v2 v2.1.2/go.mod h1:YcPU1XXisHhLzuxH9coDNf2FbKpjGlbCg3n9yuLkIJQ=
 github.com/cenkalti/backoff v2.2.1+incompatible h1:tNowT99t7UNflLxfYYSlKYsBpXdEet03Pg2g16Swow4=
 github.com/cenkalti/backoff v2.2.1+incompatible/go.mod h1:90ReRw6GdpyfrHakVjL/QHaoyV4aDUVVkXQJJJ3NXXM=