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tx.go
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tx.go
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// Code generated by entc, DO NOT EDIT.
package ent
import (
"context"
"sync"
"entgo.io/ent/dialect"
)
// Tx is a transactional client that is created by calling Client.Tx().
type Tx struct {
config
// Alert is the client for interacting with the Alert builders.
Alert *AlertClient
// Bouncer is the client for interacting with the Bouncer builders.
Bouncer *BouncerClient
// Decision is the client for interacting with the Decision builders.
Decision *DecisionClient
// Event is the client for interacting with the Event builders.
Event *EventClient
// Machine is the client for interacting with the Machine builders.
Machine *MachineClient
// Meta is the client for interacting with the Meta builders.
Meta *MetaClient
// lazily loaded.
client *Client
clientOnce sync.Once
// completion callbacks.
mu sync.Mutex
onCommit []CommitHook
onRollback []RollbackHook
// ctx lives for the life of the transaction. It is
// the same context used by the underlying connection.
ctx context.Context
}
type (
// Committer is the interface that wraps the Commit method.
Committer interface {
Commit(context.Context, *Tx) error
}
// The CommitFunc type is an adapter to allow the use of ordinary
// function as a Committer. If f is a function with the appropriate
// signature, CommitFunc(f) is a Committer that calls f.
CommitFunc func(context.Context, *Tx) error
// CommitHook defines the "commit middleware". A function that gets a Committer
// and returns a Committer. For example:
//
// hook := func(next ent.Committer) ent.Committer {
// return ent.CommitFunc(func(ctx context.Context, tx *ent.Tx) error {
// // Do some stuff before.
// if err := next.Commit(ctx, tx); err != nil {
// return err
// }
// // Do some stuff after.
// return nil
// })
// }
//
CommitHook func(Committer) Committer
)
// Commit calls f(ctx, m).
func (f CommitFunc) Commit(ctx context.Context, tx *Tx) error {
return f(ctx, tx)
}
// Commit commits the transaction.
func (tx *Tx) Commit() error {
txDriver := tx.config.driver.(*txDriver)
var fn Committer = CommitFunc(func(context.Context, *Tx) error {
return txDriver.tx.Commit()
})
tx.mu.Lock()
hooks := append([]CommitHook(nil), tx.onCommit...)
tx.mu.Unlock()
for i := len(hooks) - 1; i >= 0; i-- {
fn = hooks[i](fn)
}
return fn.Commit(tx.ctx, tx)
}
// OnCommit adds a hook to call on commit.
func (tx *Tx) OnCommit(f CommitHook) {
tx.mu.Lock()
defer tx.mu.Unlock()
tx.onCommit = append(tx.onCommit, f)
}
type (
// Rollbacker is the interface that wraps the Rollback method.
Rollbacker interface {
Rollback(context.Context, *Tx) error
}
// The RollbackFunc type is an adapter to allow the use of ordinary
// function as a Rollbacker. If f is a function with the appropriate
// signature, RollbackFunc(f) is a Rollbacker that calls f.
RollbackFunc func(context.Context, *Tx) error
// RollbackHook defines the "rollback middleware". A function that gets a Rollbacker
// and returns a Rollbacker. For example:
//
// hook := func(next ent.Rollbacker) ent.Rollbacker {
// return ent.RollbackFunc(func(ctx context.Context, tx *ent.Tx) error {
// // Do some stuff before.
// if err := next.Rollback(ctx, tx); err != nil {
// return err
// }
// // Do some stuff after.
// return nil
// })
// }
//
RollbackHook func(Rollbacker) Rollbacker
)
// Rollback calls f(ctx, m).
func (f RollbackFunc) Rollback(ctx context.Context, tx *Tx) error {
return f(ctx, tx)
}
// Rollback rollbacks the transaction.
func (tx *Tx) Rollback() error {
txDriver := tx.config.driver.(*txDriver)
var fn Rollbacker = RollbackFunc(func(context.Context, *Tx) error {
return txDriver.tx.Rollback()
})
tx.mu.Lock()
hooks := append([]RollbackHook(nil), tx.onRollback...)
tx.mu.Unlock()
for i := len(hooks) - 1; i >= 0; i-- {
fn = hooks[i](fn)
}
return fn.Rollback(tx.ctx, tx)
}
// OnRollback adds a hook to call on rollback.
func (tx *Tx) OnRollback(f RollbackHook) {
tx.mu.Lock()
defer tx.mu.Unlock()
tx.onRollback = append(tx.onRollback, f)
}
// Client returns a Client that binds to current transaction.
func (tx *Tx) Client() *Client {
tx.clientOnce.Do(func() {
tx.client = &Client{config: tx.config}
tx.client.init()
})
return tx.client
}
func (tx *Tx) init() {
tx.Alert = NewAlertClient(tx.config)
tx.Bouncer = NewBouncerClient(tx.config)
tx.Decision = NewDecisionClient(tx.config)
tx.Event = NewEventClient(tx.config)
tx.Machine = NewMachineClient(tx.config)
tx.Meta = NewMetaClient(tx.config)
}
// txDriver wraps the given dialect.Tx with a nop dialect.Driver implementation.
// The idea is to support transactions without adding any extra code to the builders.
// When a builder calls to driver.Tx(), it gets the same dialect.Tx instance.
// Commit and Rollback are nop for the internal builders and the user must call one
// of them in order to commit or rollback the transaction.
//
// If a closed transaction is embedded in one of the generated entities, and the entity
// applies a query, for example: Alert.QueryXXX(), the query will be executed
// through the driver which created this transaction.
//
// Note that txDriver is not goroutine safe.
type txDriver struct {
// the driver we started the transaction from.
drv dialect.Driver
// tx is the underlying transaction.
tx dialect.Tx
}
// newTx creates a new transactional driver.
func newTx(ctx context.Context, drv dialect.Driver) (*txDriver, error) {
tx, err := drv.Tx(ctx)
if err != nil {
return nil, err
}
return &txDriver{tx: tx, drv: drv}, nil
}
// Tx returns the transaction wrapper (txDriver) to avoid Commit or Rollback calls
// from the internal builders. Should be called only by the internal builders.
func (tx *txDriver) Tx(context.Context) (dialect.Tx, error) { return tx, nil }
// Dialect returns the dialect of the driver we started the transaction from.
func (tx *txDriver) Dialect() string { return tx.drv.Dialect() }
// Close is a nop close.
func (*txDriver) Close() error { return nil }
// Commit is a nop commit for the internal builders.
// User must call `Tx.Commit` in order to commit the transaction.
func (*txDriver) Commit() error { return nil }
// Rollback is a nop rollback for the internal builders.
// User must call `Tx.Rollback` in order to rollback the transaction.
func (*txDriver) Rollback() error { return nil }
// Exec calls tx.Exec.
func (tx *txDriver) Exec(ctx context.Context, query string, args, v interface{}) error {
return tx.tx.Exec(ctx, query, args, v)
}
// Query calls tx.Query.
func (tx *txDriver) Query(ctx context.Context, query string, args, v interface{}) error {
return tx.tx.Query(ctx, query, args, v)
}
var _ dialect.Driver = (*txDriver)(nil)