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gitea/models/db/index.go
Wim cb50375e2b
Add more linters to improve code readability (#19989)
Add nakedret, unconvert, wastedassign, stylecheck and nolintlint linters to improve code readability

- nakedret - https://github.com/alexkohler/nakedret - nakedret is a Go static analysis tool to find naked returns in functions greater than a specified function length.
- unconvert - https://github.com/mdempsky/unconvert - Remove unnecessary type conversions
- wastedassign - https://github.com/sanposhiho/wastedassign -  wastedassign finds wasted assignment statements.
- notlintlint -  Reports ill-formed or insufficient nolint directives
- stylecheck - https://staticcheck.io/docs/checks/#ST - keep style consistent
  - excluded: [ST1003 - Poorly chosen identifier](https://staticcheck.io/docs/checks/#ST1003) and [ST1005 - Incorrectly formatted error string](https://staticcheck.io/docs/checks/#ST1005)
2022-06-20 12:02:49 +02:00

111 lines
3.6 KiB
Go

// Copyright 2021 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 db
import (
"context"
"errors"
"fmt"
"code.gitea.io/gitea/modules/setting"
)
// ResourceIndex represents a resource index which could be used as issue/release and others
// We can create different tables i.e. issue_index, release_index and etc.
type ResourceIndex struct {
GroupID int64 `xorm:"pk"`
MaxIndex int64 `xorm:"index"`
}
// UpsertResourceIndex the function will not return until it acquires the lock or receives an error.
func UpsertResourceIndex(ctx context.Context, tableName string, groupID int64) (err error) {
// An atomic UPSERT operation (INSERT/UPDATE) is the only operation
// that ensures that the key is actually locked.
switch {
case setting.Database.UseSQLite3 || setting.Database.UsePostgreSQL:
_, err = Exec(ctx, fmt.Sprintf("INSERT INTO %s (group_id, max_index) "+
"VALUES (?,1) ON CONFLICT (group_id) DO UPDATE SET max_index = %s.max_index+1",
tableName, tableName), groupID)
case setting.Database.UseMySQL:
_, err = Exec(ctx, fmt.Sprintf("INSERT INTO %s (group_id, max_index) "+
"VALUES (?,1) ON DUPLICATE KEY UPDATE max_index = max_index+1", tableName),
groupID)
case setting.Database.UseMSSQL:
// https://weblogs.sqlteam.com/dang/2009/01/31/upsert-race-condition-with-merge/
_, err = Exec(ctx, fmt.Sprintf("MERGE %s WITH (HOLDLOCK) as target "+
"USING (SELECT ? AS group_id) AS src "+
"ON src.group_id = target.group_id "+
"WHEN MATCHED THEN UPDATE SET target.max_index = target.max_index+1 "+
"WHEN NOT MATCHED THEN INSERT (group_id, max_index) "+
"VALUES (src.group_id, 1);", tableName),
groupID)
default:
return fmt.Errorf("database type not supported")
}
return err
}
var (
// ErrResouceOutdated represents an error when request resource outdated
ErrResouceOutdated = errors.New("resource outdated")
// ErrGetResourceIndexFailed represents an error when resource index retries 3 times
ErrGetResourceIndexFailed = errors.New("get resource index failed")
)
const (
// MaxDupIndexAttempts max retry times to create index
MaxDupIndexAttempts = 3
)
// GetNextResourceIndex retried 3 times to generate a resource index
func GetNextResourceIndex(tableName string, groupID int64) (int64, error) {
for i := 0; i < MaxDupIndexAttempts; i++ {
idx, err := getNextResourceIndex(tableName, groupID)
if err == ErrResouceOutdated {
continue
}
if err != nil {
return 0, err
}
return idx, nil
}
return 0, ErrGetResourceIndexFailed
}
// DeleteResouceIndex delete resource index
func DeleteResouceIndex(ctx context.Context, tableName string, groupID int64) error {
_, err := Exec(ctx, fmt.Sprintf("DELETE FROM %s WHERE group_id=?", tableName), groupID)
return err
}
// getNextResourceIndex return the next index
func getNextResourceIndex(tableName string, groupID int64) (int64, error) {
ctx, commiter, err := TxContext()
if err != nil {
return 0, err
}
defer commiter.Close()
var preIdx int64
if _, err := GetEngine(ctx).SQL(fmt.Sprintf("SELECT max_index FROM %s WHERE group_id = ?", tableName), groupID).Get(&preIdx); err != nil {
return 0, err
}
if err := UpsertResourceIndex(ctx, tableName, groupID); err != nil {
return 0, err
}
var curIdx int64
has, err := GetEngine(ctx).SQL(fmt.Sprintf("SELECT max_index FROM %s WHERE group_id = ? AND max_index=?", tableName), groupID, preIdx+1).Get(&curIdx)
if err != nil {
return 0, err
}
if !has {
return 0, ErrResouceOutdated
}
if err := commiter.Commit(); err != nil {
return 0, err
}
return curIdx, nil
}