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// Copyright 2022 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package pull
import (
"context"
"fmt"
"code.gitea.io/gitea/models/db"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/timeutil"
)
// ViewedState stores for a file in which state it is currently viewed
type ViewedState uint8
const (
Unviewed ViewedState = iota
HasChanged // cannot be set from the UI/ API, only internally
Viewed
)
func (viewedState ViewedState) String() string {
switch viewedState {
case Unviewed:
return "unviewed"
case HasChanged:
return "has-changed"
case Viewed:
return "viewed"
default:
return fmt.Sprintf("unknown(value=%d)", viewedState)
}
}
// ReviewState stores for a user-PR-commit combination which files the user has already viewed
type ReviewState struct {
ID int64 `xorm:"pk autoincr"`
UserID int64 `xorm:"NOT NULL UNIQUE(pull_commit_user)"`
PullID int64 `xorm:"NOT NULL INDEX UNIQUE(pull_commit_user) DEFAULT 0"` // Which PR was the review on?
CommitSHA string `xorm:"NOT NULL VARCHAR(40) UNIQUE(pull_commit_user)"` // Which commit was the head commit for the review?
UpdatedFiles map[string]ViewedState `xorm:"NOT NULL LONGTEXT JSON"` // Stores for each of the changed files of a PR whether they have been viewed, changed since last viewed, or not viewed
UpdatedUnix timeutil.TimeStamp `xorm:"updated"` // Is an accurate indicator of the order of commits as we do not expect it to be possible to make reviews on previous commits
}
func init() {
db.RegisterModel(new(ReviewState))
}
// GetReviewState returns the ReviewState with all given values prefilled, whether or not it exists in the database.
// If the review didn't exist before in the database, it won't afterwards either.
// The returned boolean shows whether the review exists in the database
func GetReviewState(ctx context.Context, userID, pullID int64, commitSHA string) (*ReviewState, bool, error) {
review := &ReviewState{UserID: userID, PullID: pullID, CommitSHA: commitSHA}
has, err := db.GetEngine(ctx).Get(review)
return review, has, err
}
// UpdateReviewState updates the given review inside the database, regardless of whether it existed before or not
// The given map of files with their viewed state will be merged with the previous review, if present
func UpdateReviewState(ctx context.Context, userID, pullID int64, commitSHA string, updatedFiles map[string]ViewedState) error {
log.Trace("Updating review for user %d, repo %d, commit %s with the updated files %v.", userID, pullID, commitSHA, updatedFiles)
review, exists, err := GetReviewState(ctx, userID, pullID, commitSHA)
if err != nil {
return err
}
if exists {
review.UpdatedFiles = mergeFiles(review.UpdatedFiles, updatedFiles)
} else if previousReview, err := getNewestReviewStateApartFrom(ctx, userID, pullID, commitSHA); err != nil {
return err
// Overwrite the viewed files of the previous review if present
} else if previousReview != nil {
review.UpdatedFiles = mergeFiles(previousReview.UpdatedFiles, updatedFiles)
} else {
review.UpdatedFiles = updatedFiles
}
// Insert or Update review
engine := db.GetEngine(ctx)
if !exists {
log.Trace("Inserting new review for user %d, repo %d, commit %s with the updated files %v.", userID, pullID, commitSHA, review.UpdatedFiles)
_, err := engine.Insert(review)
return err
}
log.Trace("Updating already existing review with ID %d (user %d, repo %d, commit %s) with the updated files %v.", review.ID, userID, pullID, commitSHA, review.UpdatedFiles)
_, err = engine.ID(review.ID).Update(&ReviewState{UpdatedFiles: review.UpdatedFiles})
return err
}
// mergeFiles merges the given maps of files with their viewing state into one map.
// Values from oldFiles will be overridden with values from newFiles
func mergeFiles(oldFiles, newFiles map[string]ViewedState) map[string]ViewedState {
if oldFiles == nil {
return newFiles
} else if newFiles == nil {
return oldFiles
}
for file, viewed := range newFiles {
oldFiles[file] = viewed
}
return oldFiles
}
// GetNewestReviewState gets the newest review of the current user in the current PR.
// The returned PR Review will be nil if the user has not yet reviewed this PR.
func GetNewestReviewState(ctx context.Context, userID, pullID int64) (*ReviewState, error) {
var review ReviewState
has, err := db.GetEngine(ctx).Where("user_id = ?", userID).And("pull_id = ?", pullID).OrderBy("updated_unix DESC").Get(&review)
if err != nil || !has {
return nil, err
}
return &review, err
}
// getNewestReviewStateApartFrom is like GetNewestReview, except that the second newest review will be returned if the newest review points at the given commit.
// The returned PR Review will be nil if the user has not yet reviewed this PR.
func getNewestReviewStateApartFrom(ctx context.Context, userID, pullID int64, commitSHA string) (*ReviewState, error) {
var reviews []ReviewState
err := db.GetEngine(ctx).Where("user_id = ?", userID).And("pull_id = ?", pullID).OrderBy("updated_unix DESC").Limit(2).Find(&reviews)
// It would also be possible to use ".And("commit_sha != ?", commitSHA)" instead of the error handling below
// However, benchmarks show drastically improved performance by not doing that
// Error cases in which no review should be returned
if err != nil || len(reviews) == 0 || (len(reviews) == 1 && reviews[0].CommitSHA == commitSHA) {
return nil, err
// The first review points at the commit to exclude, hence skip to the second review
} else if len(reviews) >= 2 && reviews[0].CommitSHA == commitSHA {
return &reviews[1], nil
}
// As we have no error cases left, the result must be the first element in the list
return &reviews[0], nil
}
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