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vendor/cloud.google.com/go/pubsub/message.go

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+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// 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
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package pubsub
+
+import (
+	"time"
+
+	"github.com/golang/protobuf/ptypes"
+	pb "google.golang.org/genproto/googleapis/pubsub/v1"
+)
+
+// Message represents a Pub/Sub message.
+type Message struct {
+	// ID identifies this message.
+	// This ID is assigned by the server and is populated for Messages obtained from a subscription.
+	// This field is read-only.
+	ID string
+
+	// Data is the actual data in the message.
+	Data []byte
+
+	// Attributes represents the key-value pairs the current message
+	// is labelled with.
+	Attributes map[string]string
+
+	// ackID is the identifier to acknowledge this message.
+	ackID string
+
+	// The time at which the message was published.
+	// This is populated by the server for Messages obtained from a subscription.
+	// This field is read-only.
+	PublishTime time.Time
+
+	calledDone bool
+
+	// The done method of the iterator that created this Message.
+	done func(string, bool)
+}
+
+func toMessage(resp *pb.ReceivedMessage) (*Message, error) {
+	if resp.Message == nil {
+		return &Message{ackID: resp.AckId}, nil
+	}
+
+	pubTime, err := ptypes.Timestamp(resp.Message.PublishTime)
+	if err != nil {
+		return nil, err
+	}
+	return &Message{
+		ackID:       resp.AckId,
+		Data:        resp.Message.Data,
+		Attributes:  resp.Message.Attributes,
+		ID:          resp.Message.MessageId,
+		PublishTime: pubTime,
+	}, nil
+}
+
+// Done completes the processing of a Message that was returned from a MessageIterator.
+// ack indicates whether the message should be acknowledged.
+// Client code must call Done when finished for each Message returned by an iterator.
+// Done may only be called on Messages returned by a MessageIterator.
+// If message acknowledgement fails, the Message will be redelivered.
+// Calls to Done have no effect after the first call.
+//
+// See MessageIterator.Next for an example.
+func (m *Message) Done(ack bool) {
+	if m.calledDone {
+		return
+	}
+	m.calledDone = true
+	m.done(m.ackID, ack)
+}