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Diffstat (limited to 'vendor/google.golang.org/appengine/internal/transaction.go')
-rw-r--r--vendor/google.golang.org/appengine/internal/transaction.go115
1 files changed, 0 insertions, 115 deletions
diff --git a/vendor/google.golang.org/appengine/internal/transaction.go b/vendor/google.golang.org/appengine/internal/transaction.go
deleted file mode 100644
index 9006ae6..0000000
--- a/vendor/google.golang.org/appengine/internal/transaction.go
+++ /dev/null
@@ -1,115 +0,0 @@
-// Copyright 2014 Google Inc. All rights reserved.
-// Use of this source code is governed by the Apache 2.0
-// license that can be found in the LICENSE file.
-
-package internal
-
-// This file implements hooks for applying datastore transactions.
-
-import (
- "errors"
- "reflect"
-
- "github.com/golang/protobuf/proto"
- netcontext "golang.org/x/net/context"
-
- basepb "google.golang.org/appengine/internal/base"
- pb "google.golang.org/appengine/internal/datastore"
-)
-
-var transactionSetters = make(map[reflect.Type]reflect.Value)
-
-// RegisterTransactionSetter registers a function that sets transaction information
-// in a protocol buffer message. f should be a function with two arguments,
-// the first being a protocol buffer type, and the second being *datastore.Transaction.
-func RegisterTransactionSetter(f interface{}) {
- v := reflect.ValueOf(f)
- transactionSetters[v.Type().In(0)] = v
-}
-
-// applyTransaction applies the transaction t to message pb
-// by using the relevant setter passed to RegisterTransactionSetter.
-func applyTransaction(pb proto.Message, t *pb.Transaction) {
- v := reflect.ValueOf(pb)
- if f, ok := transactionSetters[v.Type()]; ok {
- f.Call([]reflect.Value{v, reflect.ValueOf(t)})
- }
-}
-
-var transactionKey = "used for *Transaction"
-
-func transactionFromContext(ctx netcontext.Context) *transaction {
- t, _ := ctx.Value(&transactionKey).(*transaction)
- return t
-}
-
-func withTransaction(ctx netcontext.Context, t *transaction) netcontext.Context {
- return netcontext.WithValue(ctx, &transactionKey, t)
-}
-
-type transaction struct {
- transaction pb.Transaction
- finished bool
-}
-
-var ErrConcurrentTransaction = errors.New("internal: concurrent transaction")
-
-func RunTransactionOnce(c netcontext.Context, f func(netcontext.Context) error, xg bool, readOnly bool, previousTransaction *pb.Transaction) (*pb.Transaction, error) {
- if transactionFromContext(c) != nil {
- return nil, errors.New("nested transactions are not supported")
- }
-
- // Begin the transaction.
- t := &transaction{}
- req := &pb.BeginTransactionRequest{
- App: proto.String(FullyQualifiedAppID(c)),
- }
- if xg {
- req.AllowMultipleEg = proto.Bool(true)
- }
- if previousTransaction != nil {
- req.PreviousTransaction = previousTransaction
- }
- if readOnly {
- req.Mode = pb.BeginTransactionRequest_READ_ONLY.Enum()
- } else {
- req.Mode = pb.BeginTransactionRequest_READ_WRITE.Enum()
- }
- if err := Call(c, "datastore_v3", "BeginTransaction", req, &t.transaction); err != nil {
- return nil, err
- }
-
- // Call f, rolling back the transaction if f returns a non-nil error, or panics.
- // The panic is not recovered.
- defer func() {
- if t.finished {
- return
- }
- t.finished = true
- // Ignore the error return value, since we are already returning a non-nil
- // error (or we're panicking).
- Call(c, "datastore_v3", "Rollback", &t.transaction, &basepb.VoidProto{})
- }()
- if err := f(withTransaction(c, t)); err != nil {
- return &t.transaction, err
- }
- t.finished = true
-
- // Commit the transaction.
- res := &pb.CommitResponse{}
- err := Call(c, "datastore_v3", "Commit", &t.transaction, res)
- if ae, ok := err.(*APIError); ok {
- /* TODO: restore this conditional
- if appengine.IsDevAppServer() {
- */
- // The Python Dev AppServer raises an ApplicationError with error code 2 (which is
- // Error.CONCURRENT_TRANSACTION) and message "Concurrency exception.".
- if ae.Code == int32(pb.Error_BAD_REQUEST) && ae.Detail == "ApplicationError: 2 Concurrency exception." {
- return &t.transaction, ErrConcurrentTransaction
- }
- if ae.Code == int32(pb.Error_CONCURRENT_TRANSACTION) {
- return &t.transaction, ErrConcurrentTransaction
- }
- }
- return &t.transaction, err
-}