here-data-sdk-cpp/examples/StreamLayerReadExample.cpp at master · uhertlein/here-data-sdk-cpp · GitHub

History

233 lines (212 loc) · 9.1 KB

Raw

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

209

210

211

212

213

214

215

216

217

218

219

220

221

222

223

224

225

226

227

228

229

230

231

232

233

* 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.

* SPDX-License-Identifier: Apache-2.0

* License-Filename: LICENSE

#include "StreamLayerReadExample.h"

#include <future>

#include <iostream>

#include <olp/authentication/TokenProvider.h>

#include <olp/core/client/HRN.h>

#include <olp/core/client/OlpClientSettings.h>

#include <olp/core/client/OlpClientSettingsFactory.h>

#include <olp/core/logging/Log.h>

#include <olp/core/utils/Base64.h>

#include <olp/dataservice/read/StreamLayerClient.h>

namespace dataread = olp::dataservice::read;

namespace {

constexpr auto kLogTag = "read-stream-layer-example";

constexpr auto kNumberOfThreads = 2u;

bool CreateSubscription(dataread::StreamLayerClient& client,

dataread::SubscribeRequest subscribe_request) {

auto subscribe_future = client.Subscribe(subscribe_request);

auto subscribe_response = subscribe_future.GetFuture().get();

if (!subscribe_response.IsSuccessful()) {

OLP_SDK_LOG_ERROR_F(

kLogTag, "Failed to create subscription - HTTP Status: %d Message: %s",

subscribe_response.GetError().GetHttpStatusCode(),

subscribe_response.GetError().GetMessage().c_str());

return false;

}

OLP_SDK_LOG_INFO_F(kLogTag,

"Client subscribe successfuly (subscription_id=%s)",

subscribe_response.GetResult().c_str());

return true;

}

int GetDataFromMessages(dataread::StreamLayerClient& client,

const dataread::model::Messages& result) {

const auto& messages = result.GetMessages();

for (const auto& message : messages) {

// If data is greater than 1 MB, the data handle is present. The data handle

// is a unique identifier that is used to identify content and retrieve the

// content using GetData.

auto handle = message.GetMetaData().GetDataHandle();

if (handle) {

OLP_SDK_LOG_INFO_F(kLogTag, "Message data: handle - %s, size - %lu",

handle.get().c_str(),

message.GetMetaData().GetDataSize().get());

// use GetData(const model::Message& message) with message instance to

// request actual data with data handle.

auto message_future = client.GetData(message);

auto message_result = message_future.GetFuture().get();

if (!message_result.IsSuccessful()) {

OLP_SDK_LOG_WARNING_F(kLogTag,

"Failed to get data for data handle %s - HTTP "

"Status: %d Message: %s",

handle.get().c_str(),

message_result.GetError().GetHttpStatusCode(),

message_result.GetError().GetMessage().c_str());

continue;

}

auto message_data = message_result.MoveResult();

OLP_SDK_LOG_INFO_F(kLogTag, "GetData for %s successful: size - %lu",

handle.get().c_str(), message_data->size());

} else {

// If data is less than 1 MB, the data content published directly in the

// metadata and encoded in Base64.

OLP_SDK_LOG_INFO_F(kLogTag, "Message data: size - %lu",

message.GetData()->size());

}

return messages.size();

}

void RunPoll(dataread::StreamLayerClient& client) {

unsigned int total_messages_size = 0;

// Get the messages, and commit offsets till all data is consumed, or max

// times 5

unsigned int max_times_to_poll = 5;

while (max_times_to_poll-- > 0) {

auto poll_future = client.Poll();

auto poll_response = poll_future.GetFuture().get();

if (!poll_response.IsSuccessful()) {

OLP_SDK_LOG_WARNING_F(kLogTag,

"Failed to poll data - HTTP Status: %d Message: %s",

poll_response.GetError().GetHttpStatusCode(),

poll_response.GetError().GetMessage().c_str());

continue;

}

auto result = poll_response.MoveResult();

auto messages_size = GetDataFromMessages(client, result);

total_messages_size += messages_size;

if (!messages_size) {

break;

}

if (total_messages_size > 0) {

OLP_SDK_LOG_INFO_F(kLogTag, "Poll data - Success, messages size - %u",

total_messages_size);

} else {

OLP_SDK_LOG_INFO(kLogTag, "No messages is received");

}

bool DeleteSubscription(dataread::StreamLayerClient& client) {

auto unsubscribe_future = client.Unsubscribe();

auto unsubscribe_response = unsubscribe_future.GetFuture().get();

if (!unsubscribe_response.IsSuccessful()) {

OLP_SDK_LOG_ERROR_F(kLogTag,

"Failed to unsubscribe - HTTP Status: %d Message: %s",

unsubscribe_response.GetError().GetHttpStatusCode(),

unsubscribe_response.GetError().GetMessage().c_str());

return false;

}

OLP_SDK_LOG_INFO(kLogTag, "Client unsubscribe successfuly");

return true;

}

} // namespace

int RunStreamLayerExampleRead(

const AccessKey& access_key, const std::string& catalog,

const std::string& layer_id,

dataread::SubscribeRequest::SubscriptionMode subscription_mode) {

OLP_SDK_LOG_INFO_F(

kLogTag, "Starting stream layer read, catalog=%s, layer=%s, mode=%s",

catalog.c_str(), layer_id.c_str(),

(subscription_mode ==

dataread::SubscribeRequest::SubscriptionMode::kParallel)

? "parallel"

: "serial");

// Create a task scheduler instance

std::shared_ptr<olp::thread::TaskScheduler> task_scheduler =

olp::client::OlpClientSettingsFactory::CreateDefaultTaskScheduler();

// Create a network client

auto http_client = olp::client::OlpClientSettingsFactory::

CreateDefaultNetworkRequestHandler();

// Initialize authentication settings

olp::authentication::Settings settings({access_key.id, access_key.secret});

settings.task_scheduler = task_scheduler;

settings.network_request_handler = http_client;

// Setup AuthenticationSettings with a default token provider that will

// retrieve an OAuth 2.0 token from OLP.

olp::client::AuthenticationSettings auth_settings;

auth_settings.token_provider =

olp::authentication::TokenProviderDefault(std::move(settings));

// Setup OlpClientSettings and provide it to the StreamLayerClient.

olp::client::OlpClientSettings client_settings;

client_settings.authentication_settings = auth_settings;

client_settings.network_request_handler = std::move(http_client);

client_settings.task_scheduler = task_scheduler;

// Set consumer configuration options. Other options ant its default values

// described here:

// https://developer.here.com/olp/documentation/data-api/api-reference-stream.html

dataread::ConsumerOptions expected_options = {

{"auto.offset.reset", "earliest"},

{"enable.auto.commit", "false"},

{"group.id", "group_id_1"}};

// Create subscription, used kSerial or kParallel subscription mode

dataread::SubscribeRequest subscribe_request =

dataread::SubscribeRequest()

.WithSubscriptionMode(subscription_mode)

.WithConsumerProperties(

dataread::ConsumerProperties(expected_options));

// value accumulate result

std::atomic<int> value(0);

auto read_from_stream_layer = [&]() {

// Create stream layer client with settings and catalog, layer specified

dataread::StreamLayerClient client(olp::client::HRN{catalog}, layer_id,

client_settings);

if (!CreateSubscription(client, subscribe_request)) {

value.store(-1);

}

RunPoll(client);

if (!DeleteSubscription(client)) {

value.store(-1);

}

};

if (subscription_mode ==

dataread::SubscribeRequest::SubscriptionMode::kSerial) {

// With serial subscription you can read smaller volumes of data with a

// single subscription.

read_from_stream_layer();

} else {

// With parallel subscription you can read large volumes of data in a

// parallel manner. The subscription and message reading workflow is similar

// to serial subscription except that you are allowed to create multiple

// subscriptions for the same HRN, layer and group.id using multiple

// processes/threads. This allows you to read and commit messages for each

// subscription in parallel.

OLP_SDK_LOG_INFO_F(kLogTag,

"Starting parallel subscription mode, threads=%u",

kNumberOfThreads);

std::vector<std::thread> threads;

threads.reserve(kNumberOfThreads);

for (unsigned int i = 0; i < kNumberOfThreads; i++) {

threads.emplace_back(read_from_stream_layer);

}

for (auto& thread : threads) {

thread.join();

}

return value.load();

}

here-data-sdk-cpp/examples/StreamLayerReadExample.cpp at master · uhertlein/here-data-sdk-cpp · GitHub

Expand file tree

Breadcrumbs

StreamLayerReadExample.cpp

Latest commit

History

Breadcrumbs

StreamLayerReadExample.cpp

File metadata and controls