Move db related basic functions to models/db (#17075)

* Move db related basic functions to models/db

* Fix lint

* Fix lint

* Fix test

* Fix lint

* Fix lint

* revert unnecessary change

* Fix test

* Fix wrong replace string

* Use *Context

* Correct committer spelling and fix wrong replaced words

Co-authored-by: zeripath <art27@cantab.net>

models/statistic.go

@@ -0,0 +1,63 @@
+// Copyright 2021 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package models
+
+import "code.gitea.io/gitea/models/db"
+
+// Statistic contains the database statistics
+type Statistic struct {
+	Counter struct {
+		User, Org, PublicKey,
+		Repo, Watch, Star, Action, Access,
+		Issue, IssueClosed, IssueOpen,
+		Comment, Oauth, Follow,
+		Mirror, Release, LoginSource, Webhook,
+		Milestone, Label, HookTask,
+		Team, UpdateTask, Attachment int64
+	}
+}
+
+// GetStatistic returns the database statistics
+func GetStatistic() (stats Statistic) {
+	stats.Counter.User = CountUsers()
+	stats.Counter.Org = CountOrganizations()
+	stats.Counter.PublicKey, _ = db.DefaultContext().Engine().Count(new(PublicKey))
+	stats.Counter.Repo = CountRepositories(true)
+	stats.Counter.Watch, _ = db.DefaultContext().Engine().Count(new(Watch))
+	stats.Counter.Star, _ = db.DefaultContext().Engine().Count(new(Star))
+	stats.Counter.Action, _ = db.DefaultContext().Engine().Count(new(Action))
+	stats.Counter.Access, _ = db.DefaultContext().Engine().Count(new(Access))
+
+	type IssueCount struct {
+		Count    int64
+		IsClosed bool
+	}
+	issueCounts := []IssueCount{}
+
+	_ = db.DefaultContext().Engine().Select("COUNT(*) AS count, is_closed").Table("issue").GroupBy("is_closed").Find(&issueCounts)
+	for _, c := range issueCounts {
+		if c.IsClosed {
+			stats.Counter.IssueClosed = c.Count
+		} else {
+			stats.Counter.IssueOpen = c.Count
+		}
+	}
+
+	stats.Counter.Issue = stats.Counter.IssueClosed + stats.Counter.IssueOpen
+
+	stats.Counter.Comment, _ = db.DefaultContext().Engine().Count(new(Comment))
+	stats.Counter.Oauth = 0
+	stats.Counter.Follow, _ = db.DefaultContext().Engine().Count(new(Follow))
+	stats.Counter.Mirror, _ = db.DefaultContext().Engine().Count(new(Mirror))
+	stats.Counter.Release, _ = db.DefaultContext().Engine().Count(new(Release))
+	stats.Counter.LoginSource = CountLoginSources()
+	stats.Counter.Webhook, _ = db.DefaultContext().Engine().Count(new(Webhook))
+	stats.Counter.Milestone, _ = db.DefaultContext().Engine().Count(new(Milestone))
+	stats.Counter.Label, _ = db.DefaultContext().Engine().Count(new(Label))
+	stats.Counter.HookTask, _ = db.DefaultContext().Engine().Count(new(HookTask))
+	stats.Counter.Team, _ = db.DefaultContext().Engine().Count(new(Team))
+	stats.Counter.Attachment, _ = db.DefaultContext().Engine().Count(new(Attachment))
+	return
+}