98 lines
2.9 KiB
Go
98 lines
2.9 KiB
Go
|
// 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
|
||
|
|
|
||
|
|
// size is the approximate size of the message's data and attributes.
|
||
|
|
size int
|
||
|
|
|
||
|
|
calledDone bool
|
||
|
|
|
||
|
|
// The done method of the iterator that created this Message.
|
||
|
|
doneFunc 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
|
||
|
|
}
|
||
|
|
|
||
|
|
// Ack indicates successful processing of a Message passed to the Subscriber.Receive callback.
|
||
|
|
// It should not be called on any other Message value.
|
||
|
|
// If message acknowledgement fails, the Message will be redelivered.
|
||
|
|
// Client code must call Ack or Nack when finished for each received Message.
|
||
|
|
// Calls to Ack or Nack have no effect after the first call.
|
||
|
|
func (m *Message) Ack() {
|
||
|
|
m.done(true)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Nack indicates that the client will not or cannot process a Message passed to the Subscriber.Receive callback.
|
||
|
|
// It should not be called on any other Message value.
|
||
|
|
// Nack will result in the Message being redelivered more quickly than if it were allowed to expire.
|
||
|
|
// Client code must call Ack or Nack when finished for each received Message.
|
||
|
|
// Calls to Ack or Nack have no effect after the first call.
|
||
|
|
func (m *Message) Nack() {
|
||
|
|
m.done(false)
|
||
|
|
}
|
||
|
|
|
||
|
|
func (m *Message) done(ack bool) {
|
||
|
|
if m.calledDone {
|
||
|
|
return
|
||
|
|
}
|
||
|
|
m.calledDone = true
|
||
|
|
m.doneFunc(m.ackID, ack)
|
||
|
|
}
|