Comments on review should have the same sha (#13448)

* When replying to an outdated comment it should not appear on the files page

This happened because the comment took the latest commitID as its base instead of the
reviewID that it was replying to.

There was also no way of creating an already outdated comment - and a
reply to a review on an outdated line should be outdated.

Signed-off-by: Andrew Thornton <art27@cantab.net>

* fix test

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Fix broken migration

Signed-off-by: Andrew Thornton <art27@cantab.net>

* fix mssql

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Create temporary table because ... well MSSQL ...

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Create temporary table because ... well MSSQL ...

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Create temporary table because ... well MSSQL ...

Signed-off-by: Andrew Thornton <art27@cantab.net>

* fix mssql

Signed-off-by: Andrew Thornton <art27@cantab.net>

* move session within the batch

Signed-off-by: Andrew Thornton <art27@cantab.net>

* regen the sqlcmd each time round the loop

Signed-off-by: Andrew Thornton <art27@cantab.net>

* as per @lunny

Signed-off-by: Andrew Thornton <art27@cantab.net>

Co-authored-by: techknowlogick <techknowlogick@gitea.io>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

3 files changed, 124 insertions, 0 deletions

diff --git a/models/issue_comment.go b/models/issue_comment.go
index a7e9c049bf..7bcea40b93 100644
--- a/models/issue_comment.go
+++ b/models/issue_comment.go
@@ -712,6 +712,7 @@ func createComment(e *xorm.Session, opts *CreateCommentOptions) (_ *Comment, err
 		RefAction:        opts.RefAction,
 		RefIsPull:        opts.RefIsPull,
 		IsForcePush:      opts.IsForcePush,
+		Invalidated:      opts.Invalidated,
 	}
 	if _, err = e.Insert(comment); err != nil {
 		return nil, err
@@ -878,6 +879,7 @@ type CreateCommentOptions struct {
 	RefAction        references.XRefAction
 	RefIsPull        bool
 	IsForcePush      bool
+	Invalidated      bool
 }
 
 // CreateComment creates comment of issue or commit.
@@ -953,6 +955,8 @@ type FindCommentsOptions struct {
 	ReviewID int64
 	Since    int64
 	Before   int64
+	Line     int64
+	TreePath string
 	Type     CommentType
 }
 
@@ -976,6 +980,12 @@ func (opts *FindCommentsOptions) toConds() builder.Cond {
 	if opts.Type != CommentTypeUnknown {
 		cond = cond.And(builder.Eq{"comment.type": opts.Type})
 	}
+	if opts.Line > 0 {
+		cond = cond.And(builder.Eq{"comment.line": opts.Line})
+	}
+	if len(opts.TreePath) > 0 {
+		cond = cond.And(builder.Eq{"comment.tree_path": opts.TreePath})
+	}
 	return cond
 }
 
@@ -990,6 +1000,8 @@ func findComments(e Engine, opts FindCommentsOptions) ([]*Comment, error) {
 		sess = opts.setSessionPagination(sess)
 	}
 
+	// WARNING: If you change this order you will need to fix createCodeComment
+
 	return comments, sess.
 		Asc("comment.created_unix").
 		Asc("comment.id").
diff --git a/models/migrations/migrations.go b/models/migrations/migrations.go
index cbf8ae8732..4715f192c1 100644
--- a/models/migrations/migrations.go
+++ b/models/migrations/migrations.go
@@ -250,6 +250,8 @@ var migrations = []Migration{
 	NewMigration("fix publisher ID for tag releases", fixPublisherIDforTagReleases),
 	// v157 -> v158
 	NewMigration("ensure repo topics are up-to-date", fixRepoTopics),
+	// v158 -> v159
+	NewMigration("code comment replies should have the commitID of the review they are replying to", updateCodeCommentReplies),
 }
 
 // GetCurrentDBVersion returns the current db version
diff --git a/models/migrations/v158.go b/models/migrations/v158.go
new file mode 100644
index 0000000000..a6f2178f87
--- /dev/null
+++ b/models/migrations/v158.go
@@ -0,0 +1,110 @@
+// 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"
+	"strconv"
+
+	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/setting"
+
+	"xorm.io/xorm"
+)
+
+func updateCodeCommentReplies(x *xorm.Engine) error {
+	type Comment struct {
+		ID          int64  `xorm:"pk autoincr"`
+		CommitSHA   string `xorm:"VARCHAR(40)"`
+		Patch       string `xorm:"TEXT patch"`
+		Invalidated bool
+
+		// Not extracted but used in the below query
+		Type     int   `xorm:"INDEX"`
+		Line     int64 // - previous line / + proposed line
+		TreePath string
+		ReviewID int64 `xorm:"index"`
+	}
+
+	if err := x.Sync2(new(Comment)); err != nil {
+		return err
+	}
+
+	sqlSelect := `SELECT comment.id as id, first.commit_sha as commit_sha, first.patch as patch, first.invalidated as invalidated`
+	sqlTail := ` FROM comment INNER JOIN (
+		SELECT C.id, C.review_id, C.line, C.tree_path, C.patch, C.commit_sha, C.invalidated
+		FROM comment AS C
+		WHERE C.type = 21
+			AND C.created_unix =
+				(SELECT MIN(comment.created_unix)
+					FROM comment
+					WHERE comment.review_id = C.review_id
+					AND comment.type = 21
+					AND comment.line = C.line
+					AND comment.tree_path = C.tree_path)
+		) AS first
+		ON comment.review_id = first.review_id
+			AND comment.tree_path = first.tree_path AND comment.line = first.line
+	WHERE comment.type = 21
+		AND comment.id != first.id
+		AND comment.commit_sha != first.commit_sha`
+
+	var sqlCmd string
+	var start = 0
+	var batchSize = 100
+	sess := x.NewSession()
+	defer sess.Close()
+	for {
+		if err := sess.Begin(); err != nil {
+			return err
+		}
+
+		if setting.Database.UseMSSQL {
+			if _, err := sess.Exec(sqlSelect + " INTO #temp_comments" + sqlTail); err != nil {
+				log.Error("unable to create temporary table")
+				return err
+			}
+		}
+
+		var comments = make([]*Comment, 0, batchSize)
+
+		switch {
+		case setting.Database.UseMySQL:
+			sqlCmd = sqlSelect + sqlTail + " LIMIT " + strconv.Itoa(batchSize) + ", " + strconv.Itoa(start)
+		case setting.Database.UsePostgreSQL:
+			fallthrough
+		case setting.Database.UseSQLite3:
+			sqlCmd = sqlSelect + sqlTail + " LIMIT " + strconv.Itoa(batchSize) + " OFFSET " + strconv.Itoa(start)
+		case setting.Database.UseMSSQL:
+			sqlCmd = "SELECT TOP " + strconv.Itoa(batchSize) + " * FROM #temp_comments WHERE " +
+				"(id NOT IN ( SELECT TOP " + strconv.Itoa(start) + " id FROM #temp_comments ORDER BY id )) ORDER BY id"
+		default:
+			return fmt.Errorf("Unsupported database type")
+		}
+
+		if err := sess.SQL(sqlCmd).Find(&comments); err != nil {
+			log.Error("failed to select: %v", err)
+			return err
+		}
+
+		for _, comment := range comments {
+			if _, err := sess.Table("comment").ID(comment.ID).Cols("commit_sha", "patch", "invalidated").Update(comment); err != nil {
+				log.Error("failed to update comment[%d]: %v %v", comment.ID, comment, err)
+				return err
+			}
+		}
+
+		start += len(comments)
+
+		if err := sess.Commit(); err != nil {
+			return err
+		}
+		if len(comments) < batchSize {
+			break
+		}
+	}
+
+	return nil
+}