Add download counter on each book

* Closes: #40

lib/database/database.go

@@ -29,6 +29,7 @@ type DB interface {
 	GetNews(num int, days int) (news []New, err error)
 	IncViews(ID string) error
 	IncDownloads(ID string) error
+	GetDownloadCounter(ID string) (int, error)
 	GetFrontPage() FrontPage
 	AddSubmission(submission Submission) (id int, err error)
 	UpdateSubmission(id int, status string, book *Book) error
@@ -222,6 +223,7 @@ $$ LANGUAGE sql IMMUTABLE;
 -- Visits indexes
 CREATE INDEX IF NOT EXISTS visits_downloads_idx on visits(downloads DESC NULLS LAST);
 CREATE INDEX IF NOT EXISTS visits_views_idx on visits(views DESC NULLS LAST);
+CREATE INDEX IF NOT EXISTS visits_book_id_idx on visits(book_id);
 
 -- Submissions indexes
 CREATE INDEX IF NOT EXISTS submissions_id_idx on submissions(submission_id);

lib/database/ro.go

@@ -93,6 +93,10 @@ func (db *roDB) IncDownloads(ID string) error {
 	return nil
 }
 
+func (db *roDB) GetDownloadCounter(ID string) (int, error) {
+	return db.db.GetDownloadCounter(ID)
+}
+
 func (db *roDB) GetFrontPage() FrontPage {
 	return db.db.GetFrontPage()
 }

lib/database/stats.go

@@ -40,6 +40,15 @@ func (db *pgDB) IncDownloads(ID string) error {
 	return err
 }
 
+func (db *pgDB) GetDownloadCounter(ID string) (int, error) {
+	var num int
+	err := db.sql.Model(&Visit{}).
+		Column("downloads").
+		Where("book_id = ?", ID).
+		Select(&num)
+	return num, err
+}
+
 func (db *pgDB) GetFrontPage() FrontPage {
 	return db.frontPage
 }

lib/trantor.go

@@ -49,11 +49,12 @@ func logoutHandler(h handler) {
 }
 
 type bookData struct {
-	S           Status
+	S               Status
-	Book        database.Book
+	Book            database.Book
-	Description []string
+	Description     []string
-	Lists       []database.BookList
+	DownloadCounter int
-	UserLists   []string
+	Lists           []database.BookList
+	UserLists       []string
 }
 
 func bookHandler(h handler) {
@@ -73,6 +74,11 @@ func bookHandler(h handler) {
 	}
 	data.S.Title = book.Title + author + " -- " + data.S.Title
 
+	data.DownloadCounter, err = h.db.GetDownloadCounter(id)
+	if err != nil {
+		log.Error("Error getting download counter: ", err)
+	}
+
 	data.Lists, err = h.db.GetListsByBook(id)
 	if err != nil {
 		log.Error("Error getting lists: ", err)

templates/book.html

@@ -1,6 +1,7 @@
 {{template "header.html" .S}}
 
 {{$role := .S.Role}}
+{{$downloadCounter := .DownloadCounter}}
 {{with .Book}}
 <script>
 function delBook(){
@@ -52,6 +53,9 @@ function delBook(){
 		<a href="/download/{{.ID}}/{{.Title}}.epub" class="btn btn-large btn-inverse"><i class="icon-download-alt icon-white"></i> download</a>
 		<a href="/read/{{.ID}}" class="btn btn-large btn-warning"><i class="icon-eye-open icon-white"></i> read it!</a>
 		</div>
+		<div class="pull-right">
+			<small>Downloaded: {{$downloadCounter}} times</small>
+		</div>
 		</div>
 		{{if eq $role "admin" "moderator"}}
 		<div class="row"><p></p></div>