/
subscriber_quickstart.cc
57 lines (47 loc) · 1.91 KB
/
subscriber_quickstart.cc
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
// Copyright 2023 Google LLC
//
// 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
//
// https://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.
//! [START pubsub_quickstart_subscriber] [all]
#include "google/cloud/pubsub/message.h"
#include "google/cloud/pubsub/subscriber.h"
#include <iostream>
int main(int argc, char* argv[]) try {
if (argc != 3) {
std::cerr << "Usage: " << argv[0] << " <project-id> <subscription-id>\n";
return 1;
}
std::string const project_id = argv[1];
std::string const subscription_id = argv[2];
auto constexpr kWaitTimeout = std::chrono::seconds(30);
// Create a namespace alias to make the code easier to read.
namespace pubsub = ::google::cloud::pubsub;
auto subscriber = pubsub::Subscriber(pubsub::MakeSubscriberConnection(
pubsub::Subscription(project_id, subscription_id)));
auto session =
subscriber.Subscribe([&](pubsub::Message const& m, pubsub::AckHandler h) {
std::cout << "Received message " << m << "\n";
std::move(h).ack();
});
std::cout << "Waiting for messages on " + subscription_id + "...\n";
// Blocks until the timeout is reached.
auto result = session.wait_for(kWaitTimeout);
if (result == std::future_status::timeout) {
std::cout << "timeout reached, ending session\n";
session.cancel();
}
return 0;
} catch (google::cloud::Status const& status) {
std::cerr << "google::cloud::Status thrown: " << status << "\n";
return 1;
}
//! [END pubsub_quickstart_subscriber] [all]