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4323141fe2
Reviewed By: alexsn Differential Revision: D17149292 fbshipit-source-id: 837de5fad988de1e54438b47584701f2fc35326d
109 lines
3.3 KiB
Cheetah
109 lines
3.3 KiB
Cheetah
{{/*
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Copyright 2019-present Facebook Inc. All rights reserved.
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This source code is licensed under the Apache 2.0 license found
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in the LICENSE file in the root directory of this source tree.
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*/}}
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{{ define "tx" }}
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{{ template "header" $ }}
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import (
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"context"
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"sync"
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"github.com/facebookincubator/ent/dialect"
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)
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// Tx is a transactional client that is created by calling Client.Tx().
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type Tx struct {
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config
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{{ range $_, $n := $.Nodes -}}
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// {{ $n.Name }} is the client for interacting with the {{ $n.Name }} builders.
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{{ $n.Name }} *{{ $n.Name }}Client
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{{ end }}
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}
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// Commit commits the transaction.
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func (tx *Tx) Commit() error {
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return tx.config.driver.(*txDriver).tx.Commit()
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}
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// Rollback rollbacks the transaction.
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func (tx *Tx) Rollback() error {
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return tx.config.driver.(*txDriver).tx.Rollback()
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}
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// Client returns a Client that binds to current transaction.
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func (tx *Tx) Client() *Client {
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return &Client{
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config: tx.config,
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Schema: migrate.NewSchema(tx.driver),
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{{ range $_, $n := $.Nodes -}}
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{{ $n.Name }}: New{{ $n.Name }}Client(tx.config),
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{{ end -}}
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}
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}
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{{/* first node for doc example */}}
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{{- $first := index $.Nodes 0 }}
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// txDriver wraps the given dialect.Tx with a nop dialect.Driver implementation.
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// The idea is to support transactions without adding any extra code to the builders.
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// When a builder calls to driver.Tx(), it gets the same dialect.Tx instance.
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// Commit and Rollback are nop for the internal builders and the user must call one
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// of them in order to commit or rollback the transaction.
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//
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// If a closed transaction is embedded in one of the generated entities, and the entity
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// applies a query, for example: {{ $first.Name }}.QueryXXX(), the query will be executed
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// through the driver which created this transaction.
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//
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// Note that txDriver is not goroutine safe.
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type txDriver struct {
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// the driver we started the transaction from.
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drv dialect.Driver
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// tx is the underlying transaction.
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tx dialect.Tx
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}
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// newTx creates a new transactional driver.
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func newTx(ctx context.Context, drv dialect.Driver) (*txDriver, error) {
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tx, err := drv.Tx(ctx)
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if err != nil {
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return nil, err
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}
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return &txDriver{tx: tx, drv: drv}, nil
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}
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// Tx returns the transaction wrapper (txDriver) to avoid Commit or Rollback calls
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// from the internal builders. Should be called only by the internal builders.
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func (tx *txDriver) Tx(context.Context) (dialect.Tx, error) { return tx, nil }
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// Dialect returns the dialect of the driver we started the transaction from.
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func (tx *txDriver) Dialect() string { return tx.drv.Dialect() }
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// Close is a nop close.
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func (*txDriver) Close() error { return nil }
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// Commit is a nop commit for the internal builders.
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// User must call `Tx.Commit` in order to commit the transaction.
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func (*txDriver) Commit() error { return nil }
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// Rollback is a nop rollback for the internal builders.
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// User must call `Tx.Rollback` in order to rollback the transaction.
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func (*txDriver) Rollback() error { return nil }
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// Exec calls tx.Exec.
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func (tx *txDriver) Exec(ctx context.Context, query string, args, v interface{}) error {
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return tx.tx.Exec(ctx, query, args, v)
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}
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// Query calls tx.Query.
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func (tx *txDriver) Query(ctx context.Context, query string, args, v interface{}) error {
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return tx.tx.Query(ctx, query, args, v)
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}
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var _ dialect.Driver = (*txDriver)(nil)
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{{ end }}
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