Language statistics bar for repositories (#8037)

* Implementation for calculating language statistics

Impement saving code language statistics to database

Implement rendering langauge stats

Add primary laguage to show in repository list

Implement repository stats indexer queue

Add indexer test

Refactor to use queue module

* Do not timeout for queues

models/migrations/migrations.go

@@ -186,6 +186,8 @@ var migrations = []Migration{
 	NewMigration("Add some columns on review for migration", addReviewMigrateInfo),
 	// v126 -> v127
 	NewMigration("Fix topic repository count", fixTopicRepositoryCount),
+	// v127 -> v128
+	NewMigration("add repository code language statistics", addLanguageStats),
 }
 
 // Migrate database to current version

models/migrations/v127.go

@@ -0,0 +1,45 @@
+// Copyright 2020 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 migrations
+
+import (
+	"fmt"
+
+	"code.gitea.io/gitea/modules/timeutil"
+
+	"xorm.io/xorm"
+)
+
+func addLanguageStats(x *xorm.Engine) error {
+	// LanguageStat see models/repo_language_stats.go
+	type LanguageStat struct {
+		ID          int64 `xorm:"pk autoincr"`
+		RepoID      int64 `xorm:"UNIQUE(s) INDEX NOT NULL"`
+		CommitID    string
+		IsPrimary   bool
+		Language    string             `xorm:"VARCHAR(30) UNIQUE(s) INDEX NOT NULL"`
+		Percentage  float32            `xorm:"NUMERIC(5,2) NOT NULL DEFAULT 0"`
+		Color       string             `xorm:"-"`
+		CreatedUnix timeutil.TimeStamp `xorm:"INDEX CREATED"`
+	}
+
+	type RepoIndexerType int
+
+	// RepoIndexerStatus see models/repo_stats_indexer.go
+	type RepoIndexerStatus struct {
+		ID          int64           `xorm:"pk autoincr"`
+		RepoID      int64           `xorm:"INDEX(s)"`
+		CommitSha   string          `xorm:"VARCHAR(40)"`
+		IndexerType RepoIndexerType `xorm:"INDEX(s) NOT NULL DEFAULT 0"`
+	}
+
+	if err := x.Sync2(new(LanguageStat)); err != nil {
+		return fmt.Errorf("Sync2: %v", err)
+	}
+	if err := x.Sync2(new(RepoIndexerStatus)); err != nil {
+		return fmt.Errorf("Sync2: %v", err)
+	}
+	return nil
+}