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We always want to wait.\n+\twait = false\n+\n+\t// Always use the empty routing key. This driver expects to be used with topic\n+\t// exchanges, which disregard the routing key.\n+\troutingKey = \"\"\n+\n+\t// If the message can't be enqueued, return it to the sender rather than silently dropping it.\n+\tmandatory = true\n+\n+\t// If there are no waiting consumers, enqueue the message instead of dropping it\n+\timmediate = true\n+)\n+\n+// OpenTopic returns a *pubsub.Topic corresponding to the named exchange. The\n+// exchange must have been previously created (for instance, by using\n+// amqp.Channel.ExchangeDeclare). For the model of Go Cloud Pub/Sub to make sense,\n+// the exchange should be a fanout exchange, although nothing in this package\n+// enforces that.\n+//\n+// OpenTopic uses the supplied amqp.Connection for all communication. It is the caller's\n+// responsibility to establish this connection before calling OpenTopic, and to close\n+// it when it is no longer in use.\n+//\n+// The documentation of the amqp package recommends using separate connections for\n+// publishing and subscribing.\n+func OpenTopic(conn *amqp.Connection, name string) (*pubsub.Topic, error) {\n+\t// TODO(jba): support context.Context\n+\tt, err := newTopic(conn, name)\n+\tif err != nil {\n+\t\treturn nil, err\n+\t}\n+\treturn pubsub.NewTopic(t), nil\n+\n+}\n+\n+func newTopic(conn *amqp.Connection, name string) (*topic, error) {\n+\tt := &topic{\n+\t\texchange: name,\n+\t\tconn:     conn,\n+\t}\n+\tif err := t.establishChannel(); err != nil {\n+\t\treturn nil, err\n+\t}\n+\treturn t, nil\n+}\n+\n+// establishChannel creates an AMQP channel if necessary. According to the amqp\n+// package docs, once an error is returned from the channel, it must be discarded and\n+// a new one created.\n+//\n+// Must be called with the t.mu held.\n+func (t *topic) establishChannel() error {\n+\t// TODO(jba): support context.Context\n+\tif t.ch != nil {\n+\t\t// We already have a channel; nothing to do.\n+\t\treturn nil\n+\t}\n+\t// Create a new channel.\n+\tch, err := t.conn.Channel()\n+\tif err != nil {\n+\t\treturn err\n+\t}\n+\t// Put the channel into a mode where confirmations are delivered for each publish.\n+\tif err := ch.Confirm(wait); err != nil {\n+\t\treturn err\n+\t}\n+\tt.ch = ch\n+\t// Get a Go channel which will hold acks from the server. The server\n+\t// will send an ack for each published message to confirm that it was received.\n+\tt.pubc = ch.NotifyPublish(make(chan amqp.Confirmation)) // NotifyPublish returns its arg\n+\treturn nil\n+}\n+\n+// SendBatch implements driver.SendBatch.\n+func (t *topic) SendBatch(ctx context.Context, ms []*driver.Message) error {\n+\t// It is simplest to allow only one SendBatch at a time. 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