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Connect.cpp
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Connect.cpp
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/*
* Copyright 2010-2017 Amazon.com, Inc. or its affiliates. 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.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file 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.
*/
/**
* @file Connect.cpp
* @brief
*
*/
#include "util/logging/LogMacros.hpp"
#include "mqtt/ClientState.hpp"
#include "mqtt/NetworkRead.hpp"
#include "mqtt/Connect.hpp"
#define CONNECT_ACTION_DESCRIPTION "MQTT Connect Action"
#define DISCONNECT_ACTION_DESCRIPTION "MQTT Disconnect Action"
#define KEEPALIVE_ACTION_DESCRIPTION "MQTT Keep alive Action"
#define CONNECT_LOG_TAG "[Connect]"
#define DISCONNECT_LOG_TAG "[Disconnect]"
#define KEEPALIVE_LOG_TAG "[KeepAlive]"
// Must be MQTT as per MQTT spec v3.1.1
#define MQTT_CONNECT_PROTOCOL_ID "MQTT"
#define CONNACK_RESERVED_PACKET_ID 0
#define SDK_USAGE_METRICS_STRING "?SDK=CPP&Version="
namespace awsiotsdk {
namespace mqtt {
/********************************************
* ConnectPacket class function definitions *
*******************************************/
ConnectPacket::ConnectPacket(bool is_clean_session,
mqtt::Version mqtt_version,
std::chrono::seconds keep_alive_timeout,
std::unique_ptr<Utf8String> p_client_id,
std::unique_ptr<Utf8String> p_username,
std::unique_ptr<Utf8String> p_password,
std::unique_ptr<mqtt::WillOptions> p_will_msg,
bool is_metrics_enabled) {
connect_flags_ = 0;
packet_size_ = 10; // Len = 10 for MQTT_3_1_1
p_protocol_id_ = Utf8String::Create(MQTT_CONNECT_PROTOCOL_ID, 4);
is_clean_session_ = is_clean_session;
if (is_clean_session_) {
connect_flags_ |= 0x02; // Cleansession is Left-to-Right bit 7 in the flag byte
}
mqtt_version_ = mqtt_version;
keep_alive_timeout_ = keep_alive_timeout;
p_client_id_ = nullptr;
if (nullptr != p_client_id) {
packet_size_ = packet_size_ + p_client_id->Length();
p_client_id_ = std::move(p_client_id);
} else {
if (false == is_clean_session_) {
AWS_LOG_INFO(CONNECT_LOG_TAG,
"Clean session value must be true when no client ID is provided. Forcing it to true");
is_clean_session_ = true;
}
}
packet_size_ = packet_size_ + 2; // +2 for writing length
// username used for sending usage metrics
if (is_metrics_enabled) {
util::String username_string = "";
// username is not supported by the service
/*if (nullptr != p_username) {
username_string.append(p_username->ToStdString());
}*/
username_string.append(SDK_USAGE_METRICS_STRING);
username_string.append(SDK_VERSION_STRING);
p_username_ = Utf8String::Create(username_string);
packet_size_ = packet_size_ + p_username_->Length() + 2;
connect_flags_ |= 0x80;
}
// password is not supported by the service
/*p_password_ = nullptr;
if(nullptr != p_password) {
packet_size_ = packet_size_ + p_password->Length() + 2; // +2 for writing length
p_password_ = std::move(p_username);
connect_flags_ |= 0x40; // Username is Left-to-Right bit 2 in the flag byte
}*/
p_will_msg_ = nullptr;
if (nullptr != p_will_msg) {
p_will_msg_ = std::move(p_will_msg);
packet_size_ =
packet_size_ + p_will_msg_->Length() + 4; // +2 each for writing length of topic name and payload
p_will_msg_->SetConnectFlags(connect_flags_);
}
fixed_header_.Initialize(MessageTypes::CONNECT, false, QoS::QOS0, false, packet_size_);
serialized_packet_length_ = packet_size_ + fixed_header_.Length();
}
ConnectPacket::ConnectPacket(bool is_clean_session,
mqtt::Version mqtt_version,
std::chrono::seconds keep_alive_timeout,
std::unique_ptr<Utf8String> p_client_id,
std::unique_ptr<Utf8String> p_username,
std::unique_ptr<Utf8String> p_password,
std::unique_ptr<mqtt::WillOptions> p_will_msg) : ConnectPacket(is_clean_session,
mqtt_version,
keep_alive_timeout,
std::move(p_client_id),
std::move(p_username),
std::move(p_password),
std::move(p_will_msg),
true) {
}
std::shared_ptr<ConnectPacket> ConnectPacket::Create(bool is_clean_session,
mqtt::Version mqtt_version,
std::chrono::seconds keep_alive_timeout,
std::unique_ptr<Utf8String> p_client_id,
std::unique_ptr<Utf8String> p_username,
std::unique_ptr<Utf8String> p_password,
std::unique_ptr<mqtt::WillOptions> p_will_msg,
bool is_metrics_enabled) {
if (UINT16_MAX < keep_alive_timeout.count()) {
return nullptr;
}
if (nullptr == p_client_id && false == is_clean_session) {
AWS_LOG_ERROR(CONNECT_LOG_TAG, "Clean session value must be true when no client ID is provided");
return nullptr;
}
return std::make_shared<ConnectPacket>(is_clean_session,
mqtt_version,
keep_alive_timeout,
std::move(p_client_id),
std::move(p_username),
std::move(p_password),
std::move(p_will_msg),
is_metrics_enabled);
}
std::shared_ptr<ConnectPacket> ConnectPacket::Create(bool is_clean_session,
mqtt::Version mqtt_version,
std::chrono::seconds keep_alive_timeout,
std::unique_ptr<Utf8String> p_client_id,
std::unique_ptr<Utf8String> p_username,
std::unique_ptr<Utf8String> p_password,
std::unique_ptr<mqtt::WillOptions> p_will_msg) {
return Create(is_clean_session,
mqtt_version,
keep_alive_timeout,
std::move(p_client_id),
std::move(p_username),
std::move(p_password),
std::move(p_will_msg),
true);
}
util::String ConnectPacket::ToString() {
util::String buf;
buf.reserve(serialized_packet_length_);
fixed_header_.AppendToBuffer(buf);
AppendUtf8StringToBuffer(buf, p_protocol_id_);
char temp = static_cast<char>(mqtt_version_);
buf.append(&temp, 1);
temp = static_cast<char>(connect_flags_);
buf.append(&temp, 1);
// Ensure the value provided for keep alive is not too large to fit
// This can happen if the constructor was used directly instead of the Create Factory method
// Also find out why someone would want to use such a large value
if (UINT16_MAX < keep_alive_timeout_.count()) {
AppendUInt16ToBuffer(buf, static_cast<uint16_t>(UINT16_MAX));
} else {
AppendUInt16ToBuffer(buf, static_cast<uint16_t>(keep_alive_timeout_.count()));
}
if (nullptr == p_client_id_) {
// No client id provided, server should assign one
AppendUInt16ToBuffer(buf, static_cast<uint16_t>(0));
} else {
AppendUtf8StringToBuffer(buf, p_client_id_);
}
if (nullptr != p_will_msg_) {
p_will_msg_->WriteToBuffer(buf);
}
if (nullptr != p_username_) {
AppendUtf8StringToBuffer(buf, p_username_);
}
/*if(nullptr != p_password_) {
AppendUtf8StringToBuffer(buf, p_password_);;
}*/
return buf;
}
/***********************************************
* DisconnectPacket class function definitions *
**********************************************/
DisconnectPacket::DisconnectPacket() {
packet_size_ = 0; // Len = 0 for MQTT_3_1_1
fixed_header_.Initialize(MessageTypes::DISCONNECT, false, QoS::QOS0, false, packet_size_);
serialized_packet_length_ = fixed_header_.Length();
}
std::shared_ptr<DisconnectPacket> DisconnectPacket::Create() {
return std::make_shared<DisconnectPacket>();
}
util::String DisconnectPacket::ToString() {
util::String buf;
buf.reserve(serialized_packet_length_);
fixed_header_.AppendToBuffer(buf);
return buf;
}
/********************************************
* PingreqPacket class function definitions *
*******************************************/
PingreqPacket::PingreqPacket() {
packet_size_ = 0; // Len = 0 for MQTT_3_1_1
fixed_header_.Initialize(MessageTypes::PINGREQ, false, QoS::QOS0, false, packet_size_);
serialized_packet_length_ = fixed_header_.Length();
}
std::shared_ptr<PingreqPacket> PingreqPacket::Create() {
return std::make_shared<PingreqPacket>();
}
util::String PingreqPacket::ToString() {
util::String buf;
buf.reserve(serialized_packet_length_);
fixed_header_.AppendToBuffer(buf);
return buf;
}
/***************************************************
* ConnectActionAsync class function definitions *
**************************************************/
ConnectActionAsync::ConnectActionAsync(std::shared_ptr<ClientState> p_client_state)
: Action(ActionType::CONNECT, CONNECT_ACTION_DESCRIPTION) {
p_client_state_ = p_client_state;
}
std::unique_ptr<Action> ConnectActionAsync::Create(std::shared_ptr<ActionState> p_action_state) {
std::shared_ptr<mqtt::ClientState>
p_client_state = std::dynamic_pointer_cast<mqtt::ClientState>(p_action_state);
if (nullptr == p_client_state) {
return nullptr;
}
return std::unique_ptr<ConnectActionAsync>(new ConnectActionAsync(p_client_state));
}
ResponseCode ConnectActionAsync::PerformAction(std::shared_ptr<NetworkConnection> p_network_connection,
std::shared_ptr<ActionData> p_action_data) {
ResponseCode rc = ResponseCode::SUCCESS;
bool is_ack_registered = false;
std::shared_ptr<ConnectPacket> p_connect_packet = std::dynamic_pointer_cast<ConnectPacket>(p_action_data);
if (nullptr == p_connect_packet) {
// Check if Client state has any reconnect data available
p_connect_packet = std::dynamic_pointer_cast<ConnectPacket>(p_client_state_->GetAutoReconnectData());
if (nullptr == p_connect_packet) {
return ResponseCode::NULL_VALUE_ERROR;
}
} else {
p_client_state_->SetAutoReconnectData(p_connect_packet);
}
p_connect_packet->SetPacketId(CONNACK_RESERVED_PACKET_ID);
if (nullptr != p_connect_packet->p_async_ack_handler_) {
rc = p_client_state_->RegisterPendingAck(CONNACK_RESERVED_PACKET_ID,
p_connect_packet->p_async_ack_handler_);
if (ResponseCode::SUCCESS != rc) {
AWS_LOG_ERROR(CONNECT_LOG_TAG,
"Registering Ack Handler for Connect Action. %s",
ResponseHelper::ToString(rc).c_str());
} else {
is_ack_registered = true;
}
}
p_client_state_->SetKeepAliveTimeout(p_connect_packet->GetKeepAliveTimeout());
rc = p_network_connection->Connect();
if (ResponseCode::SUCCESS != rc) {
return rc;
}
const util::String packet_data = p_connect_packet->ToString();
rc = WriteToNetworkBuffer(p_network_connection, packet_data);
if (ResponseCode::SUCCESS != rc) {
if (is_ack_registered) {
p_client_state_->DeletePendingAck(CONNACK_RESERVED_PACKET_ID);
}
AWS_LOG_ERROR(CONNECT_LOG_TAG, "Connect Write to Network Failed. %s",
ResponseHelper::ToString(rc).c_str());
p_network_connection->Disconnect();
} else {
p_client_state_->setDisconnectCallbackPending(true);
}
return rc;
}
/****************************************************
* DisconnectActionAsync class function definitions *
***************************************************/
DisconnectActionAsync::DisconnectActionAsync(std::shared_ptr<ClientState> p_client_state)
: Action(ActionType::DISCONNECT, DISCONNECT_ACTION_DESCRIPTION) {
p_client_state_ = p_client_state;
}
std::unique_ptr<Action> DisconnectActionAsync::Create(std::shared_ptr<ActionState> p_action_state) {
std::shared_ptr<mqtt::ClientState>
p_client_state = std::dynamic_pointer_cast<mqtt::ClientState>(p_action_state);
if (nullptr == p_client_state) {
return nullptr;
}
return std::unique_ptr<DisconnectActionAsync>(new DisconnectActionAsync(p_client_state));
}
ResponseCode DisconnectActionAsync::PerformAction(std::shared_ptr<NetworkConnection> p_network_connection,
std::shared_ptr<ActionData> p_action_data) {
if (!p_client_state_->IsConnected()) {
return ResponseCode::NETWORK_DISCONNECTED_ERROR;
}
//Ignore error codes, always assume disconnect
p_client_state_->SetConnected(false);
ResponseCode rc = ResponseCode::SUCCESS;
// Attempt to send MQTT Disconnect if Network is still connected
if (p_network_connection->IsConnected()) {
std::shared_ptr<DisconnectPacket> p_disconnect_packet = std::dynamic_pointer_cast<DisconnectPacket>(
p_action_data);
if (nullptr != p_disconnect_packet) {
rc = WriteToNetworkBuffer(p_network_connection, p_disconnect_packet->ToString());
if (ResponseCode::SUCCESS != rc) {
AWS_LOG_WARN(DISCONNECT_LOG_TAG, "Received Response Code. %s",
ResponseHelper::ToString(rc).c_str());
}
} else {
AWS_LOG_WARN(DISCONNECT_LOG_TAG, "Error creating MQTT Disconnect packet!!");
}
}
/* convert all subscriptions to inactive */
for (auto itr = p_client_state_->subscription_map_.begin(); itr != p_client_state_->subscription_map_.end();
++itr) {
itr->second->SetActive(false);
}
rc = p_network_connection->Disconnect();
if (ResponseCode::SUCCESS != rc) {
AWS_LOG_WARN(DISCONNECT_LOG_TAG, "Network disconnect. %s", ResponseHelper::ToString(rc).c_str());
}
return ResponseCode::SUCCESS;
}
/****************************************************
* KeepaliveActionRunner class function definitions *
***************************************************/
KeepaliveActionRunner::KeepaliveActionRunner(std::shared_ptr<ClientState> p_client_state)
: Action(ActionType::KEEP_ALIVE, KEEPALIVE_ACTION_DESCRIPTION) {
p_client_state_ = p_client_state;
}
std::unique_ptr<Action> KeepaliveActionRunner::Create(std::shared_ptr<ActionState> p_action_state) {
std::shared_ptr<mqtt::ClientState>
p_client_state = std::dynamic_pointer_cast<mqtt::ClientState>(p_action_state);
if (nullptr == p_client_state) {
return nullptr;
}
return std::unique_ptr<KeepaliveActionRunner>(new KeepaliveActionRunner(p_client_state));
}
ResponseCode KeepaliveActionRunner::PerformAction(std::shared_ptr<NetworkConnection> p_network_connection,
std::shared_ptr<ActionData> p_action_data) {
// TODO : This action needs cleanup in the future
std::atomic_bool &_p_thread_continue_ = *p_thread_continue_;
std::chrono::milliseconds thread_sleep_duration(DEFAULT_CORE_THREAD_SLEEP_DURATION_MS);
// Wait for first connect, keep alive data will not be available until then
while (_p_thread_continue_ && !p_client_state_->IsConnected()) {
std::this_thread::sleep_for(thread_sleep_duration);
}
std::shared_ptr<PingreqPacket> p_pingreq_packet = PingreqPacket::Create();
if (nullptr == p_pingreq_packet) {
return ResponseCode::NULL_VALUE_ERROR;
}
ResponseCode rc = ResponseCode::SUCCESS;
p_client_state_->setDisconnectCallbackPending(true);
std::chrono::seconds reconnect_backoff_timer = p_client_state_->GetMinReconnectBackoffTimeout();
std::chrono::seconds max_backoff_value = p_client_state_->GetMaxReconnectBackoffTimeout();
std::chrono::seconds keep_alive_interval = p_client_state_->GetKeepAliveTimeout() / 2;
auto next = std::chrono::system_clock::now() + std::chrono::seconds(keep_alive_interval);
do {
if (p_client_state_->IsAutoReconnectEnabled() && p_client_state_->IsAutoReconnectRequired()) {
p_client_state_->SetPingreqPending(false);
if (p_client_state_->isDisconnectCallbackPending()) {
std::shared_ptr<ConnectPacket> p_connect_packet =
std::dynamic_pointer_cast<ConnectPacket>(p_client_state_->GetAutoReconnectData());
/**
* NOTE: All callbacks used by the keepalive should be non-blocking
*/
if (nullptr != p_client_state_->disconnect_handler_ptr_ && nullptr != p_connect_packet) {
p_client_state_->disconnect_handler_ptr_(p_connect_packet->GetClientID(),
p_client_state_->p_disconnect_app_handler_data_);
}
reconnect_backoff_timer = p_client_state_->GetMinReconnectBackoffTimeout();
max_backoff_value = p_client_state_->GetMaxReconnectBackoffTimeout();
AWS_LOG_INFO(KEEPALIVE_LOG_TAG,
"Initial value of reconnect timer : %ld!!",
reconnect_backoff_timer.count());
AWS_LOG_INFO(KEEPALIVE_LOG_TAG, "Max backoff value : %ld!!", max_backoff_value.count());
}
AWS_LOG_INFO(KEEPALIVE_LOG_TAG, "Attempting Reconnect");
std::shared_ptr<ConnectPacket> p_connect_packet =
std::dynamic_pointer_cast<ConnectPacket>(p_client_state_->GetAutoReconnectData());
rc = p_client_state_->PerformAction(ActionType::CONNECT,
p_connect_packet,
p_client_state_->GetMqttCommandTimeout());
if (nullptr != p_client_state_->reconnect_handler_ptr_) {
p_client_state_->reconnect_handler_ptr_(p_connect_packet->GetClientID(),
p_client_state_->p_reconnect_app_handler_data_,
rc);
}
if (ResponseCode::MQTT_CONNACK_CONNECTION_ACCEPTED == rc) {
p_client_state_->SetAutoReconnectRequired(false);
// if no subscriptions, skip resubscribe
if (!p_client_state_->subscription_map_.empty()) {
util::Vector<std::shared_ptr<mqtt::Subscription>> topic_vector;
util::Map<util::String, std::shared_ptr<Subscription>>::const_iterator
itr = p_client_state_->subscription_map_.begin();
while (itr != p_client_state_->subscription_map_.end()) {
topic_vector.push_back(itr->second);
itr++;
if (topic_vector.size() == MAX_TOPICS_IN_ONE_SUBSCRIBE_PACKET) {
std::shared_ptr<mqtt::SubscribePacket>
p_subscribe_packet = mqtt::SubscribePacket::Create(topic_vector);
p_subscribe_packet->SetPacketId(p_client_state_->GetNextPacketId());
rc = WriteToNetworkBuffer(p_network_connection, p_subscribe_packet->ToString());
if (ResponseCode::SUCCESS != rc) {
AWS_LOG_ERROR(KEEPALIVE_LOG_TAG,
"Resubscribe attempt returned unhandled error. \n%s",
ResponseHelper::ToString(rc).c_str());
break;
}
topic_vector.clear();
}
}
if (ResponseCode::SUCCESS == rc || ResponseCode::MQTT_CONNACK_CONNECTION_ACCEPTED == rc) {
if (!topic_vector.empty()) {
std::shared_ptr<mqtt::SubscribePacket>
p_subscribe_packet = mqtt::SubscribePacket::Create(topic_vector);
p_subscribe_packet->SetPacketId(p_client_state_->GetNextPacketId());
rc = WriteToNetworkBuffer(p_network_connection, p_subscribe_packet->ToString());
}
}
if (nullptr != p_client_state_->resubscribe_handler_ptr_) {
p_client_state_->resubscribe_handler_ptr_(p_connect_packet->GetClientID(),
p_client_state_->p_resubscribe_app_handler_data_,
rc);
}
}
/**
* NOTE :The resubscribe response can be NETWORK_DISCONNECTED_ERROR as the network might have
* disconnected again after the reconnect was successful.
*/
if (ResponseCode::NETWORK_DISCONNECTED_ERROR != rc) {
p_client_state_->SetAutoReconnectRequired(false);
} else {
p_client_state_->PerformAction(ActionType::DISCONNECT,
DisconnectPacket::Create(),
p_client_state_->GetMqttCommandTimeout());
p_client_state_->SetAutoReconnectRequired(true);
}
continue;
}
p_client_state_->setDisconnectCallbackPending(false);
AWS_LOG_ERROR(KEEPALIVE_LOG_TAG, "Reconnect failed. %s", ResponseHelper::ToString(rc).c_str());
AWS_LOG_INFO(KEEPALIVE_LOG_TAG,
"Current value of reconnect timer : %ld!!",
reconnect_backoff_timer.count());
if (max_backoff_value > reconnect_backoff_timer) {
reconnect_backoff_timer += reconnect_backoff_timer;
}
AWS_LOG_INFO(KEEPALIVE_LOG_TAG,
"Updated value of reconnect timer : %ld!!",
reconnect_backoff_timer.count());
std::this_thread::sleep_for(reconnect_backoff_timer);
continue;
} else if (p_client_state_->IsAutoReconnectRequired()) {
if (p_client_state_->isDisconnectCallbackPending()) {
std::shared_ptr<ConnectPacket> p_connect_packet =
std::dynamic_pointer_cast<ConnectPacket>(p_client_state_->GetAutoReconnectData());
if (nullptr != p_client_state_->disconnect_handler_ptr_ && nullptr != p_connect_packet) {
p_client_state_->disconnect_handler_ptr_(p_connect_packet->GetClientID(),
p_client_state_->p_disconnect_app_handler_data_);
}
p_client_state_->setDisconnectCallbackPending(false);
}
}
if (std::chrono::system_clock::now() > next) {
if (p_client_state_->IsPingreqPending()) {
if (p_client_state_->IsConnected()) {
rc = p_client_state_->PerformAction(ActionType::DISCONNECT,
DisconnectPacket::Create(),
p_client_state_->GetMqttCommandTimeout());
if (ResponseCode::SUCCESS != rc && ResponseCode::NETWORK_DISCONNECTED_ERROR != rc) {
AWS_LOG_ERROR(KEEPALIVE_LOG_TAG,
"Network Disconnect attempt returned unhandled error. \n%s",
ResponseHelper::ToString(rc).c_str());
}
}
p_client_state_->SetAutoReconnectRequired(true);
continue;
} else if (p_client_state_->IsConnected()) {
rc = WriteToNetworkBuffer(p_network_connection, p_pingreq_packet->ToString());
if (ResponseCode::SUCCESS != rc) {
AWS_LOG_ERROR(KEEPALIVE_LOG_TAG,
"Writing PingReq to Network Failed. \n%s. \nDisconnecting!",
ResponseHelper::ToString(rc).c_str());
rc = p_client_state_->PerformAction(ActionType::DISCONNECT,
DisconnectPacket::Create(),
p_client_state_->GetMqttCommandTimeout());
if (ResponseCode::SUCCESS != rc) {
AWS_LOG_ERROR(KEEPALIVE_LOG_TAG,
"Network Disconnect attempt returned unhandled error. \n%s",
ResponseHelper::ToString(rc).c_str());
}
p_client_state_->SetAutoReconnectRequired(true);
continue;
}
p_client_state_->SetPingreqPending(true);
next = std::chrono::system_clock::now() + std::chrono::seconds(keep_alive_interval);
}
}
std::this_thread::sleep_for(thread_sleep_duration);
} while (_p_thread_continue_);
return rc;
}
}
}