Migrate reviews when migrating repository from github (#9463)

* fix typo

* Migrate reviews when migrating repository from github

* fix lint

* Added test and migration when external user login

* fix test

* fix commented state

* Some improvements

* fix bug when get pull request and ref original author on code comments

* Fix migrated line; Added comment for review

* Don't load all pull requests attributes

* Fix typo

* wrong change copy head

* fix tests

* fix reactions

* Fix test

* fix fmt

* fix review comment reactions

modules/migrations/github.go

@@ -418,10 +418,14 @@ func (g *GithubDownloaderV3) GetIssues(page, perPage int) ([]*base.Issue, bool,
 
 // GetComments returns comments according issueNumber
 func (g *GithubDownloaderV3) GetComments(issueNumber int64) ([]*base.Comment, error) {
-	var allComments = make([]*base.Comment, 0, 100)
+	var (
+		allComments = make([]*base.Comment, 0, 100)
+		created     = "created"
+		asc         = "asc"
+	)
 	opt := &github.IssueListCommentsOptions{
-		Sort:      "created",
-		Direction: "asc",
+		Sort:      created,
+		Direction: asc,
 		ListOptions: github.ListOptions{
 			PerPage: 100,
 		},
@@ -614,3 +618,107 @@ func (g *GithubDownloaderV3) GetPullRequests(page, perPage int) ([]*base.PullReq
 
 	return allPRs, nil
 }
+
+func convertGithubReview(r *github.PullRequestReview) *base.Review {
+	return &base.Review{
+		ID:           r.GetID(),
+		ReviewerID:   r.GetUser().GetID(),
+		ReviewerName: r.GetUser().GetLogin(),
+		CommitID:     r.GetCommitID(),
+		Content:      r.GetBody(),
+		CreatedAt:    r.GetSubmittedAt(),
+		State:        r.GetState(),
+	}
+}
+
+func (g *GithubDownloaderV3) convertGithubReviewComments(cs []*github.PullRequestComment) ([]*base.ReviewComment, error) {
+	var rcs = make([]*base.ReviewComment, 0, len(cs))
+	for _, c := range cs {
+		// get reactions
+		var reactions []*base.Reaction
+		for i := 1; ; i++ {
+			g.sleep()
+			res, resp, err := g.client.Reactions.ListPullRequestCommentReactions(g.ctx, g.repoOwner, g.repoName, c.GetID(), &github.ListOptions{
+				Page:    i,
+				PerPage: 100,
+			})
+			if err != nil {
+				return nil, err
+			}
+			g.rate = &resp.Rate
+			if len(res) == 0 {
+				break
+			}
+			for _, reaction := range res {
+				reactions = append(reactions, &base.Reaction{
+					UserID:   reaction.User.GetID(),
+					UserName: reaction.User.GetLogin(),
+					Content:  reaction.GetContent(),
+				})
+			}
+		}
+
+		rcs = append(rcs, &base.ReviewComment{
+			ID:        c.GetID(),
+			InReplyTo: c.GetInReplyTo(),
+			Content:   c.GetBody(),
+			TreePath:  c.GetPath(),
+			DiffHunk:  c.GetDiffHunk(),
+			Position:  c.GetPosition(),
+			CommitID:  c.GetCommitID(),
+			PosterID:  c.GetUser().GetID(),
+			Reactions: reactions,
+			CreatedAt: c.GetCreatedAt(),
+			UpdatedAt: c.GetUpdatedAt(),
+		})
+	}
+	return rcs, nil
+}
+
+// GetReviews returns pull requests review
+func (g *GithubDownloaderV3) GetReviews(pullRequestNumber int64) ([]*base.Review, error) {
+	var allReviews = make([]*base.Review, 0, 100)
+	opt := &github.ListOptions{
+		PerPage: 100,
+	}
+	for {
+		g.sleep()
+		reviews, resp, err := g.client.PullRequests.ListReviews(g.ctx, g.repoOwner, g.repoName, int(pullRequestNumber), opt)
+		if err != nil {
+			return nil, fmt.Errorf("error while listing repos: %v", err)
+		}
+		g.rate = &resp.Rate
+		for _, review := range reviews {
+			r := convertGithubReview(review)
+			r.IssueIndex = pullRequestNumber
+			// retrieve all review comments
+			opt2 := &github.ListOptions{
+				PerPage: 100,
+			}
+			for {
+				g.sleep()
+				reviewComments, resp, err := g.client.PullRequests.ListReviewComments(g.ctx, g.repoOwner, g.repoName, int(pullRequestNumber), review.GetID(), opt2)
+				if err != nil {
+					return nil, fmt.Errorf("error while listing repos: %v", err)
+				}
+				g.rate = &resp.Rate
+
+				cs, err := g.convertGithubReviewComments(reviewComments)
+				if err != nil {
+					return nil, err
+				}
+				r.Comments = append(r.Comments, cs...)
+				if resp.NextPage == 0 {
+					break
+				}
+				opt2.Page = resp.NextPage
+			}
+			allReviews = append(allReviews, r)
+		}
+		if resp.NextPage == 0 {
+			break
+		}
+		opt.Page = resp.NextPage
+	}
+	return allReviews, nil
+}