gitea/models/avatar.go
zeripath b62e13a001
Open transaction when adding Avatar email-hash pairs to the DB (#12577) (#12940)
Backport #12577

When adding Avatar email-hash pairs we simply want the DB table to
represent a Set. We don't care if the hash-pair is already present,
so we just simply Insert and ignore the error.

Unfortunately this seems to cause some DBs to log the duplicate
insert to their logs - looking like a bug a in Gitea.

Now, there is no standard way in SQL to say Insert but if there's
an error ignore it. MySQL has INSERT IGNORE, PostgreSQL >= 9.5 has
INSERT ... ON CONFLICT DO NOTHING, but I do not believe that SQLite
or MSSQL have variants.

This PR places the insert in a transaction which we are happy to fail
if there is an error - hopefully this will stop the unnecessary
logging.

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

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

Co-authored-by: techknowlogick <techknowlogick@gitea.io>
2020-09-24 18:36:26 -04:00

60 lines
1.7 KiB
Go

// 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 models
import (
"crypto/md5"
"fmt"
"net/url"
"strings"
"code.gitea.io/gitea/modules/cache"
"code.gitea.io/gitea/modules/setting"
)
// EmailHash represents a pre-generated hash map
type EmailHash struct {
Hash string `xorm:"pk varchar(32)"`
Email string `xorm:"UNIQUE NOT NULL"`
}
// GetEmailForHash converts a provided md5sum to the email
func GetEmailForHash(md5Sum string) (string, error) {
return cache.GetString("Avatar:"+md5Sum, func() (string, error) {
emailHash := EmailHash{
Hash: strings.ToLower(strings.TrimSpace(md5Sum)),
}
_, err := x.Get(&emailHash)
return emailHash.Email, err
})
}
// AvatarLink returns an avatar link for a provided email
func AvatarLink(email string) string {
lowerEmail := strings.ToLower(strings.TrimSpace(email))
sum := fmt.Sprintf("%x", md5.Sum([]byte(lowerEmail)))
_, _ = cache.GetString("Avatar:"+sum, func() (string, error) {
emailHash := &EmailHash{
Email: lowerEmail,
Hash: sum,
}
// OK we're going to open a session just because I think that that might hide away any problems with postgres reporting errors
sess := x.NewSession()
defer sess.Close()
if err := sess.Begin(); err != nil {
// we don't care about any DB problem just return the lowerEmail
return lowerEmail, nil
}
_, _ = sess.Insert(emailHash)
if err := sess.Commit(); err != nil {
// Seriously we don't care about any DB problems just return the lowerEmail - we expect the transaction to fail most of the time
return lowerEmail, nil
}
return lowerEmail, nil
})
return setting.AppSubURL + "/avatar/" + url.PathEscape(sum)
}