From cd522b26ded18ef1972647ac8353f6549468e903 Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@spreadspace.org>
Date: Mon, 14 Dec 2015 03:20:59 +0100
Subject: minor refactoring at RdDb


diff --git a/rddb.go b/rddb.go
index 87ac17a..0a9e21e 100644
--- a/rddb.go
+++ b/rddb.go
@@ -147,28 +147,27 @@ func (self *RdDb) init(conf *Config) (err error) {
 	return
 }
 
-func (self *RdDb) getPassword(username string, cached bool) (pwd string, err error) {
+func (self *RdDb) getPassword(username string, cached bool) (result getPasswordResult) {
 	if cached {
-		pwd = self.password_cache[username]
+		result.password = self.password_cache[username]
 	}
 
-	if pwd == "" {
-		err = self.getPasswordStmt.QueryRow(username).Scan(&pwd)
-		if err != nil {
-			if err == sql.ErrNoRows {
-				err = fmt.Errorf("user '%s' not known by rivendell", username)
+	if result.password == "" {
+		if result.err = self.getPasswordStmt.QueryRow(username).Scan(&result.password); result.err != nil {
+			if result.err == sql.ErrNoRows {
+				result.err = fmt.Errorf("user '%s' not known by rivendell", username)
 			}
 			return
 		}
-		self.password_cache[username] = pwd
+		self.password_cache[username] = result.password
 	}
 
 	return
 }
 
-func (self *RdDb) getGroupOfCart(cart uint) (group string, err error) {
+func (self *RdDb) getGroupOfCart(cart uint) (result getGroupOfCartResult) {
 	var rows *sql.Rows
-	if rows, err = self.getGroupOfCartStmt.Query(cart, cart); err != nil {
+	if rows, result.err = self.getGroupOfCartStmt.Query(cart, cart); result.err != nil {
 		return
 	}
 	defer rows.Close()
@@ -176,22 +175,22 @@ func (self *RdDb) getGroupOfCart(cart uint) (group string, err error) {
 	for rows.Next() {
 		var name string
 		var low_cart, high_cart uint
-		if err = rows.Scan(&name, &low_cart, &high_cart); err != nil {
+		if result.err = rows.Scan(&name, &low_cart, &high_cart); result.err != nil {
 			return
 		}
 		if high_cart >= low_cart {
 			size := (high_cart - low_cart) + 1
 			if size_min > size {
-				group = name
+				result.group = name
 				size_min = size
 			}
 		}
 	}
-	if err = rows.Err(); err != nil {
+	if result.err = rows.Err(); result.err != nil {
 		return
 	}
-	if group == "" {
-		err = fmt.Errorf("cart is outside of all group cart ranges")
+	if result.group == "" {
+		result.err = fmt.Errorf("cart is outside of all group cart ranges")
 	}
 	return
 }
@@ -218,41 +217,40 @@ func (self *RdDb) getShowCarts(log string, low_cart, high_cart int) (carts []int
 	return
 }
 
-func (self *RdDb) getShowInfo(showid int) (title string, carts []int, norm_lvl int, trim_lvl int, err error) {
+func (self *RdDb) getShowInfo(showid int) (result getShowInfoResult) {
 	var macros string
 	var low_cart, high_cart int
-	err = self.getShowInfoStmt.QueryRow(showid).Scan(&title, &macros, &norm_lvl, &trim_lvl, &low_cart, &high_cart)
-	if err != nil {
-		if err == sql.ErrNoRows {
-			err = fmt.Errorf("show '%d' not found", showid)
+	result.err = self.getShowInfoStmt.QueryRow(showid).Scan(&result.title, &macros, &result.norm_lvl, &result.trim_lvl, &low_cart, &high_cart)
+	if result.err != nil {
+		if result.err == sql.ErrNoRows {
+			result.err = fmt.Errorf("show '%d' not found", showid)
 		}
 		return
 	}
-	norm_lvl /= 100
-	trim_lvl /= 100
-	carts, err = self.getShowCarts(showMacroRe.FindStringSubmatch(macros)[1], low_cart, high_cart)
+	result.norm_lvl /= 100
+	result.trim_lvl /= 100
+	result.carts, result.err = self.getShowCarts(showMacroRe.FindStringSubmatch(macros)[1], low_cart, high_cart)
 	return
 }
 
-func (self *RdDb) checkMusicGroup(group string) (ismusic bool, err error) {
+func (self *RdDb) checkMusicGroup(group string) (result checkMusicGroupResult) {
 	var cnt int
-	err = self.getMusicInfoStmt.QueryRow(group).Scan(&cnt)
-	if err != nil {
-		if err == sql.ErrNoRows {
-			err = nil
-			ismusic = false
+	if result.err = self.getMusicInfoStmt.QueryRow(group).Scan(&cnt); result.err != nil {
+		if result.err == sql.ErrNoRows {
+			result.err = nil
+			result.ismusic = false
 		}
 		return
 	}
-	ismusic = cnt > 0
+	result.ismusic = cnt > 0
 	return
 }
 
-func (self *RdDb) getMusicInfo(group string) (norm_lvl, trim_lvl int, err error) {
-	err = self.checkMusicGroupStmt.QueryRow(group).Scan(&norm_lvl, &trim_lvl)
-	if err != nil {
-		if err == sql.ErrNoRows {
-			err = fmt.Errorf("music pool '%d' not found", group)
+func (self *RdDb) getMusicInfo(group string) (result getMusicInfoResult) {
+	result.err = self.checkMusicGroupStmt.QueryRow(group).Scan(&result.norm_lvl, &result.trim_lvl)
+	if result.err != nil {
+		if result.err == sql.ErrNoRows {
+			result.err = fmt.Errorf("music pool '%d' not found", group)
 		}
 		return
 	}
@@ -266,20 +264,15 @@ func (self *RdDb) dispatchRequests() {
 		case <-self.quit:
 			return
 		case req := <-self.getPasswordChan:
-			pwd, err := self.getPassword(req.username, req.cached)
-			req.response <- getPasswordResult{pwd, err}
+			req.response <- self.getPassword(req.username, req.cached)
 		case req := <-self.getGroupOfCartChan:
-			group, err := self.getGroupOfCart(req.cart)
-			req.response <- getGroupOfCartResult{group, err}
+			req.response <- self.getGroupOfCart(req.cart)
 		case req := <-self.getShowInfoChan:
-			title, carts, norm_lvl, trim_lvl, err := self.getShowInfo(req.showid)
-			req.response <- getShowInfoResult{title, carts, norm_lvl, trim_lvl, err}
+			req.response <- self.getShowInfo(req.showid)
 		case req := <-self.checkMusicGroupChan:
-			ismusic, err := self.checkMusicGroup(req.group)
-			req.response <- checkMusicGroupResult{ismusic, err}
+			req.response <- self.checkMusicGroup(req.group)
 		case req := <-self.getMusicInfoChan:
-			norm_lvl, trim_lvl, err := self.getMusicInfo(req.group)
-			req.response <- getMusicInfoResult{norm_lvl, trim_lvl, err}
+			req.response <- self.getMusicInfo(req.group)
 		}
 	}
 }
-- 
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