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vendor/go.mongodb.org/mongo-driver/mongo/options/transactionoptions.go

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+// Copyright (C) MongoDB, Inc. 2017-present.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package options
+
+import (
+	"go.mongodb.org/mongo-driver/mongo/readconcern"
+	"go.mongodb.org/mongo-driver/mongo/readpref"
+	"go.mongodb.org/mongo-driver/mongo/writeconcern"
+)
+
+// TransactionOptions represents all possible options for starting a transaction.
+type TransactionOptions struct {
+	ReadConcern    *readconcern.ReadConcern   // The read concern for the transaction. Defaults to the session's read concern.
+	ReadPreference *readpref.ReadPref         // The read preference for the transaction. Defaults to the session's read preference.
+	WriteConcern   *writeconcern.WriteConcern // The write concern for the transaction. Defaults to the session's write concern.
+}
+
+// Transaction creates a new *TransactionOptions
+func Transaction() *TransactionOptions {
+	return &TransactionOptions{}
+}
+
+// SetReadConcern sets the read concern for the transaction.
+func (t *TransactionOptions) SetReadConcern(rc *readconcern.ReadConcern) *TransactionOptions {
+	t.ReadConcern = rc
+	return t
+}
+
+// SetReadPreference sets the read preference for the transaction.
+func (t *TransactionOptions) SetReadPreference(rp *readpref.ReadPref) *TransactionOptions {
+	t.ReadPreference = rp
+	return t
+}
+
+// SetWriteConcern sets the write concern for the transaction.
+func (t *TransactionOptions) SetWriteConcern(wc *writeconcern.WriteConcern) *TransactionOptions {
+	t.WriteConcern = wc
+	return t
+}
+
+// MergeTransactionOptions combines the given *TransactionOptions into a single *TransactionOptions in a last one wins
+// fashion.
+func MergeTransactionOptions(opts ...*TransactionOptions) *TransactionOptions {
+	t := Transaction()
+	for _, opt := range opts {
+		if opt == nil {
+			continue
+		}
+		if opt.ReadConcern != nil {
+			t.ReadConcern = opt.ReadConcern
+		}
+		if opt.ReadPreference != nil {
+			t.ReadPreference = opt.ReadPreference
+		}
+		if opt.WriteConcern != nil {
+			t.WriteConcern = opt.WriteConcern
+		}
+	}
+
+	return t
+}