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forgejo/models/db/context.go
Lunny Xiao 87db4a47c8
Also sync DB branches on push if necessary (#28361) (#28403)
Fix #28056
Backport #28361 

This PR will check whether the repo has zero branch when pushing a
branch. If that, it means this repository hasn't been synced.

The reason caused that is after user upgrade from v1.20 -> v1.21, he
just push branches without visit the repository user interface. Because
all repositories routers will check whether a branches sync is necessary
but push has not such check.

For every repository, it has two states, synced or not synced. If there
is zero branch for a repository, then it will be assumed as non-sync
state. Otherwise, it's synced state. So if we think it's synced, we just
need to update branch/insert new branch. Otherwise do a full sync. So
that, for every push, there will be almost no extra load added. It's
high performance than yours.

For the implementation, we in fact will try to update the branch first,
if updated success with affect records > 0, then all are done. Because
that means the branch has been in the database. If no record is
affected, that means the branch does not exist in database. So there are
two possibilities. One is this is a new branch, then we just need to
insert the record. Another is the branches haven't been synced, then we
need to sync all the branches into database.
2023-12-11 06:16:56 +00:00

275 lines
7.4 KiB
Go

// Copyright 2019 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package db
import (
"context"
"database/sql"
"xorm.io/builder"
"xorm.io/xorm"
)
// DefaultContext is the default context to run xorm queries in
// will be overwritten by Init with HammerContext
var DefaultContext context.Context
// contextKey is a value for use with context.WithValue.
type contextKey struct {
name string
}
// enginedContextKey is a context key. It is used with context.Value() to get the current Engined for the context
var (
enginedContextKey = &contextKey{"engined"}
_ Engined = &Context{}
)
// Context represents a db context
type Context struct {
context.Context
e Engine
transaction bool
}
func newContext(ctx context.Context, e Engine, transaction bool) *Context {
return &Context{
Context: ctx,
e: e,
transaction: transaction,
}
}
// InTransaction if context is in a transaction
func (ctx *Context) InTransaction() bool {
return ctx.transaction
}
// Engine returns db engine
func (ctx *Context) Engine() Engine {
return ctx.e
}
// Value shadows Value for context.Context but allows us to get ourselves and an Engined object
func (ctx *Context) Value(key any) any {
if key == enginedContextKey {
return ctx
}
return ctx.Context.Value(key)
}
// WithContext returns this engine tied to this context
func (ctx *Context) WithContext(other context.Context) *Context {
return newContext(ctx, ctx.e.Context(other), ctx.transaction)
}
// Engined structs provide an Engine
type Engined interface {
Engine() Engine
}
// GetEngine will get a db Engine from this context or return an Engine restricted to this context
func GetEngine(ctx context.Context) Engine {
if e := getEngine(ctx); e != nil {
return e
}
return x.Context(ctx)
}
// getEngine will get a db Engine from this context or return nil
func getEngine(ctx context.Context) Engine {
if engined, ok := ctx.(Engined); ok {
return engined.Engine()
}
enginedInterface := ctx.Value(enginedContextKey)
if enginedInterface != nil {
return enginedInterface.(Engined).Engine()
}
return nil
}
// Committer represents an interface to Commit or Close the Context
type Committer interface {
Commit() error
Close() error
}
// halfCommitter is a wrapper of Committer.
// It can be closed early, but can't be committed early, it is useful for reusing a transaction.
type halfCommitter struct {
committer Committer
committed bool
}
func (c *halfCommitter) Commit() error {
c.committed = true
// should do nothing, and the parent committer will commit later
return nil
}
func (c *halfCommitter) Close() error {
if c.committed {
// it's "commit and close", should do nothing, and the parent committer will commit later
return nil
}
// it's "rollback and close", let the parent committer rollback right now
return c.committer.Close()
}
// TxContext represents a transaction Context,
// it will reuse the existing transaction in the parent context or create a new one.
func TxContext(parentCtx context.Context) (*Context, Committer, error) {
if sess, ok := inTransaction(parentCtx); ok {
return newContext(parentCtx, sess, true), &halfCommitter{committer: sess}, nil
}
sess := x.NewSession()
if err := sess.Begin(); err != nil {
sess.Close()
return nil, nil, err
}
return newContext(DefaultContext, sess, true), sess, nil
}
// WithTx represents executing database operations on a transaction, if the transaction exist,
// this function will reuse it otherwise will create a new one and close it when finished.
func WithTx(parentCtx context.Context, f func(ctx context.Context) error) error {
if sess, ok := inTransaction(parentCtx); ok {
err := f(newContext(parentCtx, sess, true))
if err != nil {
// rollback immediately, in case the caller ignores returned error and tries to commit the transaction.
_ = sess.Close()
}
return err
}
return txWithNoCheck(parentCtx, f)
}
func txWithNoCheck(parentCtx context.Context, f func(ctx context.Context) error) error {
sess := x.NewSession()
defer sess.Close()
if err := sess.Begin(); err != nil {
return err
}
if err := f(newContext(parentCtx, sess, true)); err != nil {
return err
}
return sess.Commit()
}
// Insert inserts records into database
func Insert(ctx context.Context, beans ...any) error {
_, err := GetEngine(ctx).Insert(beans...)
return err
}
// Exec executes a sql with args
func Exec(ctx context.Context, sqlAndArgs ...any) (sql.Result, error) {
return GetEngine(ctx).Exec(sqlAndArgs...)
}
// GetByBean filled empty fields of the bean according non-empty fields to query in database.
func GetByBean(ctx context.Context, bean any) (bool, error) {
return GetEngine(ctx).Get(bean)
}
func Exist[T any](ctx context.Context, cond builder.Cond) (bool, error) {
if !cond.IsValid() {
return false, ErrConditionRequired{}
}
var bean T
return GetEngine(ctx).Where(cond).NoAutoCondition().Exist(&bean)
}
// DeleteByBean deletes all records according non-empty fields of the bean as conditions.
func DeleteByBean(ctx context.Context, bean any) (int64, error) {
return GetEngine(ctx).Delete(bean)
}
// DeleteByID deletes the given bean with the given ID
func DeleteByID(ctx context.Context, id int64, bean any) (int64, error) {
return GetEngine(ctx).ID(id).NoAutoCondition().NoAutoTime().Delete(bean)
}
// FindIDs finds the IDs for the given table name satisfying the given condition
// By passing a different value than "id" for "idCol", you can query for foreign IDs, i.e. the repo IDs which satisfy the condition
func FindIDs(ctx context.Context, tableName, idCol string, cond builder.Cond) ([]int64, error) {
ids := make([]int64, 0, 10)
if err := GetEngine(ctx).Table(tableName).
Cols(idCol).
Where(cond).
Find(&ids); err != nil {
return nil, err
}
return ids, nil
}
// DecrByIDs decreases the given column for entities of the "bean" type with one of the given ids by one
// Timestamps of the entities won't be updated
func DecrByIDs(ctx context.Context, ids []int64, decrCol string, bean any) error {
_, err := GetEngine(ctx).Decr(decrCol).In("id", ids).NoAutoCondition().NoAutoTime().Update(bean)
return err
}
// DeleteBeans deletes all given beans, beans must contain delete conditions.
func DeleteBeans(ctx context.Context, beans ...any) (err error) {
e := GetEngine(ctx)
for i := range beans {
if _, err = e.Delete(beans[i]); err != nil {
return err
}
}
return nil
}
// TruncateBeans deletes all given beans, beans may contain delete conditions.
func TruncateBeans(ctx context.Context, beans ...any) (err error) {
e := GetEngine(ctx)
for i := range beans {
if _, err = e.Truncate(beans[i]); err != nil {
return err
}
}
return nil
}
// CountByBean counts the number of database records according non-empty fields of the bean as conditions.
func CountByBean(ctx context.Context, bean any) (int64, error) {
return GetEngine(ctx).Count(bean)
}
// TableName returns the table name according a bean object
func TableName(bean any) string {
return x.TableName(bean)
}
// InTransaction returns true if the engine is in a transaction otherwise return false
func InTransaction(ctx context.Context) bool {
_, ok := inTransaction(ctx)
return ok
}
func inTransaction(ctx context.Context) (*xorm.Session, bool) {
e := getEngine(ctx)
if e == nil {
return nil, false
}
switch t := e.(type) {
case *xorm.Engine:
return nil, false
case *xorm.Session:
if t.IsInTx() {
return t, true
}
return nil, false
default:
return nil, false
}
}