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discovery_client.cc
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/*
* Copyright (c) 2013 Juniper Networks, Inc. All rights reserved.
*/
#include "base/util.h"
#include "base/logging.h"
#include <base/connection_info.h>
#include <sandesh/sandesh.h>
#include <sandesh/sandesh_types.h>
#include <sandesh/common/vns_constants.h>
#include <boost/uuid/uuid.hpp>
#include <boost/uuid/random_generator.hpp>
#include <boost/uuid/uuid_io.hpp>
#include <boost/bind.hpp>
#include <boost/functional/hash.hpp>
#include <discovery/client/discovery_client_types.h>
#include <discovery/client/discovery_client_stats_types.h>
#include "discovery_client_priv.h"
#include "discovery_client.h"
#include "xml/xml_base.h"
#include "xml/xml_pugi.h"
using namespace std;
namespace ip = boost::asio::ip;
using process::ConnectionState;
using process::ConnectionType;
using process::ConnectionStatus;
SandeshTraceBufferPtr DiscoveryClientTraceBuf(SandeshTraceBufferCreate(
"DiscoveryClient", 1000));
/*************** Discovery Service Subscribe Response Message Header **********/
DSResponseHeader::DSResponseHeader(std::string serviceName, uint8_t numbOfInstances,
EventManager *evm,
DiscoveryServiceClient *ds_client)
: serviceName_(serviceName), numbOfInstances_(numbOfInstances),
chksum_(0),
subscribe_timer_(TimerManager::CreateTimer(*evm->io_service(), "Subscribe Timer",
TaskScheduler::GetInstance()->GetTaskId("http client"), 0)),
ds_client_(ds_client), subscribe_msg_(""), attempts_(0),
sub_sent_(0), sub_rcvd_(0), sub_fail_(0),
subscribe_cb_called_(false) {
}
DSResponseHeader::~DSResponseHeader() {
service_list_.clear();
TimerManager::DeleteTimer(subscribe_timer_);
}
int DSResponseHeader::GetConnectTime() const {
int backoff = min(attempts_, 6);
// kConnectInterval = 30secs
return std::min(backoff ? 1 << (backoff - 1) : 0, 30);
}
bool DSResponseHeader::SubscribeTimerExpired() {
// Resend subscription request
ds_client_->Subscribe(serviceName_, numbOfInstances_);
return false;
}
void DSResponseHeader::StartSubscribeTimer(int seconds) {
subscribe_timer_->Cancel();
subscribe_timer_->Start(seconds * 1000,
boost::bind(&DSResponseHeader::SubscribeTimerExpired, this));
}
/**************** Discovery Service Publish Response Message ******************/
DSPublishResponse::DSPublishResponse(std::string serviceName,
EventManager *evm,
DiscoveryServiceClient *ds_client)
: serviceName_(serviceName),
publish_hb_timer_(TimerManager::CreateTimer(*evm->io_service(), "Publish Timer",
TaskScheduler::GetInstance()->GetTaskId("http client"), 0)),
publish_conn_timer_(TimerManager::CreateTimer(*evm->io_service(), "Publish Conn Timer",
TaskScheduler::GetInstance()->GetTaskId("http client"), 0)),
ds_client_(ds_client), publish_msg_(""), attempts_(0),
pub_sent_(0), pub_rcvd_(0), pub_fail_(0), pub_fallback_(0),
pub_hb_sent_(0), pub_hb_fail_(0), pub_hb_rcvd_(0), pub_hb_timeout_(0),
publish_cb_called_(false), heartbeat_cb_called_(false) {
}
DSPublishResponse::~DSPublishResponse() {
assert(publish_conn_timer_->cancelled() == true);
assert(publish_hb_timer_->cancelled() == true);
TimerManager::DeleteTimer(publish_hb_timer_);
TimerManager::DeleteTimer(publish_conn_timer_);
}
bool DSPublishResponse::HeartBeatTimerExpired() {
// Check if ReEvalPublish cb registered, if so enqueue re-evaluate trigger
DiscoveryServiceClient::ReEvalPublishCbHandlerMap::iterator it =
ds_client_->reeval_publish_map_.find(serviceName_);
if (it != ds_client_->reeval_publish_map_.end()) {
// publish is sent periodically
ds_client_->reevaluate_publish_cb_queue_.Enqueue(
boost::bind(&DiscoveryServiceClient::ReEvaluatePublish, ds_client_,
serviceName_, it->second));
} else {
stringstream hb;
hb.clear();
hb << "<cookie>" << cookie_ << "</cookie>" ;
ds_client_->SendHeartBeat(serviceName_, hb.str());
}
//
// Start the timer again, by returning true
//
return true;
}
void DSPublishResponse::StartHeartBeatTimer(int seconds) {
publish_hb_timer_->Cancel();
publish_hb_timer_->Start(seconds * 1000,
boost::bind(&DSPublishResponse::HeartBeatTimerExpired, this));
}
void DSPublishResponse::StopHeartBeatTimer() {
publish_hb_timer_->Cancel();
}
int DSPublishResponse::GetConnectTime() const {
int backoff = min(attempts_, 6);
// kConnectInterval = 30secs
return std::min(backoff ? 1 << (backoff - 1) : 0, 30);
}
bool DSPublishResponse::PublishConnectTimerExpired() {
// Resend subscription request
ds_client_->Publish(serviceName_);
return false;
}
void DSPublishResponse::StopPublishConnectTimer() {
publish_conn_timer_->Cancel();
}
void DSPublishResponse::StartPublishConnectTimer(int seconds) {
// TODO lock needed??
StopPublishConnectTimer();
publish_conn_timer_->Start(seconds * 1000,
boost::bind(&DSPublishResponse::PublishConnectTimerExpired, this));
}
static void WaitForIdle() {
static const int kTimeout = 15;
TaskScheduler *scheduler = TaskScheduler::GetInstance();
for (int i = 0; i < (kTimeout * 1000); i++) {
if (scheduler->IsEmpty()) {
break;
}
usleep(1000);
}
}
/******************* DiscoveryServiceClient ************************************/
DiscoveryServiceClient::DiscoveryServiceClient(EventManager *evm,
boost::asio::ip::tcp::endpoint ep,
std::string client_name,
std::string reeval_publish_taskname)
: http_client_(new HttpClient(evm)),
evm_(evm), ds_endpoint_(ep),
work_queue_(TaskScheduler::GetInstance()->GetTaskId("http client"), 0,
boost::bind(&DiscoveryServiceClient::DequeueEvent, this, _1)),
reevaluate_publish_cb_queue_(
TaskScheduler::GetInstance()->GetTaskId(reeval_publish_taskname), 0,
boost::bind(&DiscoveryServiceClient::ReEvalautePublishCbDequeueEvent,
this, _1)),
shutdown_(false),
subscriber_name_(client_name),
heartbeat_interval_(DiscoveryServiceClient::kHeartBeatInterval) {
}
void DiscoveryServiceClient::Init() {
http_client_->Init();
}
void DiscoveryServiceClient::Shutdown() {
// Cleanup subscribed services
for (ServiceResponseMap::const_iterator iter = service_response_map_.begin(), next = iter;
iter != service_response_map_.end(); iter = next) {
next++;
Unsubscribe(iter->first);
}
// Cleanup published services
for (PublishResponseMap::const_iterator iter = publish_response_map_.begin(), next = iter;
iter != publish_response_map_.end(); iter = next) {
next++;
WithdrawPublish(iter->first);
}
http_client_->Shutdown();
// Make sure that the above enqueues on the work queue are processed
WaitForIdle();
shutdown_ = true;
}
bool DiscoveryServiceClient::ParseDiscoveryServerConfig(
std::string discovery_server, uint16_t port,
ip::tcp::endpoint *dss_ep) {
bool valid = false;
if (!discovery_server.empty()) {
boost::system::error_code error;
dss_ep->port(port);
dss_ep->address(ip::address::from_string(discovery_server, error));
if (error) {
boost::asio::io_service io_service;
ip::tcp::resolver resolver(io_service);
stringstream ss;
ss << port;
ip::tcp::resolver::query query(discovery_server, ss.str());
ip::tcp::resolver::iterator endpoint_iter = resolver.resolve(query, error);
if (!error) {
ip::tcp::endpoint ep = *endpoint_iter++;
dss_ep->address(ep.address());
dss_ep->port(ep.port());
valid = true;
} else {
LOG(ERROR, " Invalid Discovery Endpoint:" << discovery_server <<
" error:" << error);
valid = false;
}
} else {
valid = true;
}
}
return (valid);
}
DiscoveryServiceClient::~DiscoveryServiceClient() {
assert(shutdown_);
work_queue_.Shutdown();
TcpServerManager::DeleteServer(http_client_);
}
bool DiscoveryServiceClient::DequeueEvent(EnqueuedCb cb) {
cb();
return true;
}
void DiscoveryServiceClient::PublishResponseHandler(std::string &xmls,
boost::system::error_code ec,
std::string serviceName,
HttpConnection *conn) {
// Connection will be deleted on complete transfer
// on indication by the http client code.
// Get Response Header
DSPublishResponse *resp = NULL;
PublishResponseMap::iterator loc = publish_response_map_.find(serviceName);
if (loc != publish_response_map_.end()) {
resp = loc->second;
} else {
DISCOVERY_CLIENT_LOG_ERROR(DiscoveryClientLog, serviceName,
"Stray Publish Response");
if (conn) {
http_client_->RemoveConnection(conn);
}
// Update connection info
ConnectionState::GetInstance()->Update(ConnectionType::DISCOVERY,
serviceName, ConnectionStatus::DOWN, ds_endpoint_,
"Stray Publish Response");
return;
}
if (xmls.empty()) {
if (conn) {
http_client_->RemoveConnection(conn);
}
// Errorcode is of type CURLcode
if (ec.value() != 0) {
DISCOVERY_CLIENT_TRACE(DiscoveryClientErrorMsg,
"Error PublishResponseHandler ",
serviceName + " " + curl_error_category.message(ec.value()),
ec.value());
// exponential back-off and retry
resp->pub_fail_++;
resp->attempts_++;
// Update connection info
ConnectionState::GetInstance()->Update(ConnectionType::DISCOVERY,
serviceName, ConnectionStatus::DOWN, ds_endpoint_,
ec.message());
resp->StartPublishConnectTimer(resp->GetConnectTime());
} else if (resp->publish_cb_called_ == false) {
DISCOVERY_CLIENT_TRACE(DiscoveryClientErrorMsg,
"PublishResponseHandler, Only header received",
serviceName, ec.value());
// exponential back-off and retry
resp->pub_fail_++;
resp->attempts_++;
// Update connection info
ConnectionState::GetInstance()->Update(ConnectionType::DISCOVERY,
serviceName, ConnectionStatus::DOWN, ds_endpoint_,
"Only header received");
resp->StartPublishConnectTimer(resp->GetConnectTime());
}
return;
}
resp->publish_cb_called_ = true;
//Parse the xml string and build DSResponse
auto_ptr<XmlBase> impl(XmppXmlImplFactory::Instance()->GetXmlImpl());
if (impl->LoadDoc(xmls) == -1) {
DISCOVERY_CLIENT_TRACE(DiscoveryClientErrorMsg,
"PublishResponseHandler: Loading Xml Doc failed!!",
serviceName, ec.value());
// exponential back-off and retry
resp->pub_fail_++;
resp->attempts_++;
// Update connection info
ConnectionState::GetInstance()->Update(ConnectionType::DISCOVERY,
serviceName, ConnectionStatus::DOWN, ds_endpoint_,
"Loading Xml Doc Failed");
resp->StartPublishConnectTimer(resp->GetConnectTime());
return;
}
DISCOVERY_CLIENT_TRACE(DiscoveryClientMsg, "PublishResponseHandler",
serviceName, xmls);
//Extract cookie from message
XmlPugi *pugi = reinterpret_cast<XmlPugi *>(impl.get());
pugi::xml_node node = pugi->FindNode("cookie");
if (!pugi->IsNull(node)) {
std::string cookie = node.child_value();
if (cookie.find(serviceName) == string::npos) {
// Backward compatibility support, newer client and older
// discovery server, fallback to older publish api
DISCOVERY_CLIENT_TRACE(DiscoveryClientErrorMsg,
"PublishResponseHandler, Version Mismatch, older discovery server",
serviceName, ec.value());
resp->pub_fallback_++;
resp->publish_msg_.clear();
resp->publish_msg_ = resp->client_msg_;
Publish(serviceName);
ConnectionState::GetInstance()->Update(ConnectionType::DISCOVERY,
serviceName, ConnectionStatus::DOWN, ds_endpoint_,
"Publish Response - Version Mismatch");
return;
}
resp->cookie_ = node.child_value();
resp->attempts_ = 0;
resp->pub_rcvd_++;
// Update connection info
ConnectionState::GetInstance()->Update(ConnectionType::DISCOVERY,
serviceName, ConnectionStatus::UP, ds_endpoint_,
"Publish Response - HeartBeat");
//Start periodic heartbeat, timer per service
resp->StartHeartBeatTimer(GetHeartBeatInterval());
} else {
pugi::xml_node node = pugi->FindNode("h1");
if (!pugi->IsNull(node)) {
std::string response = node.child_value();
if (response.compare("Error: 404 Not Found") == 0) {
// Backward compatibility support, newer client and older
// discovery server, fallback to older publish api
DISCOVERY_CLIENT_TRACE(DiscoveryClientMsg,
"PublishResponseHandler: 404 Not Found", serviceName,
"fallback to older publish api");
resp->pub_fallback_++;
resp->publish_hdr_.clear();
resp->publish_hdr_ = "publish";
Publish(serviceName);
return;
} else {
// 503, Service Unavailable
// 504, Gateway Timeout, and other errors
DISCOVERY_CLIENT_TRACE(DiscoveryClientMsg,
"PublishResponseHandler: Error, resend publish",
serviceName, xmls);
}
// exponential back-off and retry
resp->pub_fail_++;
resp->attempts_++;
// Update connection info
ConnectionState::GetInstance()->Update(ConnectionType::DISCOVERY,
serviceName, ConnectionStatus::DOWN, ds_endpoint_,
response);
resp->StartPublishConnectTimer(resp->GetConnectTime());
} else {
DISCOVERY_CLIENT_TRACE(DiscoveryClientMsg,
"PublishResponseHandler: No [h1] tag, resend publish",
serviceName, xmls);
// exponential back-off and retry
resp->pub_fail_++;
resp->attempts_++;
// Update connection info
ConnectionState::GetInstance()->Update(ConnectionType::DISCOVERY,
serviceName, ConnectionStatus::DOWN, ds_endpoint_,
"No [h1] tag");
resp->StartPublishConnectTimer(resp->GetConnectTime());
}
}
}
void DiscoveryServiceClient::Publish(std::string serviceName, std::string &msg) {
DSPublishResponse *pub_msg = new DSPublishResponse(serviceName, evm_, this);
pub_msg->dss_ep_.address(ds_endpoint_.address());
pub_msg->dss_ep_.port(ds_endpoint_.port());
pub_msg->client_msg_ = msg;
pub_msg->publish_msg_ = "<publish>" + msg;
auto_ptr<XmlBase> impl(XmppXmlImplFactory::Instance()->GetXmlImpl());
if (impl->LoadDoc(msg) != -1) {
XmlPugi *pugi = reinterpret_cast<XmlPugi *>(impl.get());
pugi::xml_node node_addr = pugi->FindNode("ip-address");
if (!pugi->IsNull(node_addr)) {
std::string addr = node_addr.child_value();
pub_msg->publish_msg_ +=
"<remote-addr>" + addr + "</remote-addr>";
}
}
pub_msg->publish_msg_ += "</publish>";
boost::system::error_code ec;
pub_msg->publish_hdr_ = "publish/" + boost::asio::ip::host_name(ec);
pub_msg->pub_sent_++;
//save it in a map
publish_response_map_.insert(make_pair(serviceName, pub_msg));
SendHttpPostMessage(pub_msg->publish_hdr_, serviceName,
pub_msg->publish_msg_);
// Update connection info
ConnectionState::GetInstance()->Update(ConnectionType::DISCOVERY,
serviceName, ConnectionStatus::INIT, ds_endpoint_,
"Publish");
DISCOVERY_CLIENT_TRACE(DiscoveryClientMsg, pub_msg->publish_hdr_,
serviceName, pub_msg->publish_msg_);
}
void DiscoveryServiceClient::ReEvaluatePublish(std::string serviceName,
ReEvalPublishCbHandler cb) {
// Get Response Header
PublishResponseMap::iterator loc = publish_response_map_.find(serviceName);
if (loc != publish_response_map_.end()) {
DSPublishResponse *resp = loc->second;
bool oper_state = resp->oper_state;
std::string reeval_reason;
resp->oper_state = cb(reeval_reason);
if ((resp->oper_state != oper_state) ||
(resp->oper_state_reason.compare(reeval_reason))) {
auto_ptr<XmlBase> impl(XmppXmlImplFactory::Instance()->GetXmlImpl());
if (impl->LoadDoc(resp->publish_msg_) == -1) {
resp->pub_fail_++;
return;
}
resp->oper_state_reason = reeval_reason;
XmlPugi *pugi = reinterpret_cast<XmlPugi *>(impl.get());
if (resp->oper_state) {
pugi->ModifyNode("oper-state", "up");
pugi->ModifyNode("oper-state-reason", reeval_reason);
// Update connection info
ConnectionState::GetInstance()->Update(ConnectionType::DISCOVERY,
serviceName, ConnectionStatus::UP, ds_endpoint_,
"Change Publish State, UP " + reeval_reason);
} else {
pugi->ModifyNode("oper-state", "down");
pugi->ModifyNode("oper-state-reason", reeval_reason);
// Update connection info
ConnectionState::GetInstance()->Update(ConnectionType::DISCOVERY,
serviceName, ConnectionStatus::DOWN, ds_endpoint_,
"Change Publish State, DOWN " + reeval_reason);
}
stringstream ss;
impl->PrintDoc(ss);
resp->publish_msg_ = ss.str();
}
resp->pub_sent_++;
resp->publish_cb_called_ = false;
/* Send publish unconditionally */
DISCOVERY_CLIENT_TRACE(DiscoveryClientMsg, resp->publish_hdr_,
serviceName, resp->publish_msg_);
SendHttpPostMessage(resp->publish_hdr_, serviceName,
resp->publish_msg_);
}
}
bool DiscoveryServiceClient::ReEvalautePublishCbDequeueEvent(EnqueuedCb cb) {
cb();
return true;
}
// Register application specific ReEvalPublish cb
void DiscoveryServiceClient::RegisterReEvalPublishCbHandler(
std::string serviceName, ReEvalPublishCbHandler cb) {
reeval_publish_map_.insert(make_pair(serviceName, cb));
}
void DiscoveryServiceClient::Publish(std::string serviceName, std::string &msg,
ReEvalPublishCbHandler cb) {
//Register the callback handler
RegisterReEvalPublishCbHandler(serviceName, cb);
DSPublishResponse *pub_msg = new DSPublishResponse(serviceName, evm_, this);
pub_msg->dss_ep_.address(ds_endpoint_.address());
pub_msg->dss_ep_.port(ds_endpoint_.port());
pub_msg->oper_state = false;
pub_msg->oper_state_reason = "Initial Registration";
pub_msg->client_msg_ = msg;
pub_msg->publish_msg_ += "<publish>" + msg;
pub_msg->publish_msg_ += "<service-type>" + serviceName + "</service-type>";
auto_ptr<XmlBase> impl(XmppXmlImplFactory::Instance()->GetXmlImpl());
if (impl->LoadDoc(msg) != -1) {
XmlPugi *pugi = reinterpret_cast<XmlPugi *>(impl.get());
pugi::xml_node node_addr = pugi->FindNode("ip-address");
if (!pugi->IsNull(node_addr)) {
std::string addr = node_addr.child_value();
pub_msg->publish_msg_ +=
"<remote-addr>" + addr + "</remote-addr>";
}
}
pub_msg->publish_msg_ += "<oper-state>down</oper-state>";
pub_msg->publish_msg_ += "<oper-state-reason>";
pub_msg->publish_msg_ += pub_msg->oper_state_reason;
pub_msg->publish_msg_ += "</oper-state-reason>";
pub_msg->publish_msg_ += "</publish>";
boost::system::error_code ec;
pub_msg->publish_hdr_ = "publish/" + boost::asio::ip::host_name(ec);
pub_msg->pub_sent_++;
//save it in a map
publish_response_map_.insert(make_pair(serviceName, pub_msg));
SendHttpPostMessage(pub_msg->publish_hdr_, serviceName,
pub_msg->publish_msg_);
// Update connection info
ConnectionState::GetInstance()->Update(ConnectionType::DISCOVERY,
serviceName, ConnectionStatus::INIT, ds_endpoint_,
"Publish");
DISCOVERY_CLIENT_TRACE(DiscoveryClientMsg, pub_msg->publish_hdr_,
serviceName, pub_msg->publish_msg_);
}
void DiscoveryServiceClient::Publish(std::string serviceName) {
// Get Response Header
PublishResponseMap::iterator loc = publish_response_map_.find(serviceName);
if (loc != publish_response_map_.end()) {
DSPublishResponse *resp = loc->second;
resp->pub_sent_++;
SendHttpPostMessage(resp->publish_hdr_, serviceName, resp->publish_msg_);
DISCOVERY_CLIENT_TRACE(DiscoveryClientMsg, resp->publish_hdr_,
serviceName, resp->publish_msg_);
}
}
void DiscoveryServiceClient::WithdrawPublishInternal(std::string serviceName) {
PublishResponseMap::iterator loc = publish_response_map_.find(serviceName);
if (loc != publish_response_map_.end()) {
DSPublishResponse *resp = loc->second;
resp->StopPublishConnectTimer();
resp->StopHeartBeatTimer();
publish_response_map_.erase(loc);
delete resp;
}
}
void DiscoveryServiceClient::WithdrawPublish(std::string serviceName) {
assert(shutdown_ == false);
work_queue_.Enqueue(boost::bind(&DiscoveryServiceClient::WithdrawPublishInternal,
this, serviceName));
}
// Register application specific Response cb
void DiscoveryServiceClient::RegisterSubscribeResponseHandler(std::string serviceName,
ServiceHandler cb) {
subscribe_map_.insert(make_pair(serviceName, cb));
}
void DiscoveryServiceClient::UnRegisterSubscribeResponseHandler(std::string serviceName) {
subscribe_map_.erase(serviceName);
}
void DiscoveryServiceClient::Subscribe(std::string serviceName,
uint8_t numbOfInstances,
ServiceHandler cb) {
//Register the callback handler
RegisterSubscribeResponseHandler(serviceName, cb);
//Build the DOM tree
auto_ptr<XmlBase> impl(XmppXmlImplFactory::Instance()->GetXmlImpl());
impl->LoadDoc("");
XmlPugi *pugi = reinterpret_cast<XmlPugi *>(impl.get());
pugi->AddNode(serviceName, "");
stringstream inst;
inst << static_cast<int>(numbOfInstances);
pugi->AddChildNode("instances", inst.str());
pugi->ReadNode(serviceName); //Reset parent
if (!subscriber_name_.empty()) {
pugi->AddChildNode("client-type", subscriber_name_);
pugi->ReadNode(serviceName); //Reset parent
}
boost::system::error_code error;
string client_id = boost::asio::ip::host_name(error) + ":" +
subscriber_name_;
pugi->AddChildNode("client", client_id);
pugi->ReadNode(serviceName); //Reset parent
//Retrieve ip address
ip::udp::resolver resolver(*evm_->io_service());
ip::udp::resolver::query query(ip::udp::v4(), ip::host_name(error), "");
ip::udp::resolver::iterator endpoint_iter = resolver.resolve(query, error);
if (!error) {
ip::udp::endpoint ep = *endpoint_iter++;
pugi->AddChildNode("remote-addr", ep.address().to_string());
}
stringstream ss;
impl->PrintDoc(ss);
// Create Response Header
ServiceResponseMap::iterator loc = service_response_map_.find(serviceName);
if (loc == service_response_map_.end()) {
DSResponseHeader *resp = new DSResponseHeader(serviceName, numbOfInstances,
evm_, this);
//cache the request
resp->subscribe_msg_ = ss.str();
resp->sub_sent_++;
service_response_map_.insert(make_pair(serviceName, resp));
}
SendHttpPostMessage("subscribe", serviceName, ss.str());
// Update connection info
ConnectionState::GetInstance()->Update(ConnectionType::DISCOVERY,
serviceName, ConnectionStatus::INIT, ds_endpoint_,
"Subscribe");
DISCOVERY_CLIENT_TRACE(DiscoveryClientMsg, "subscribe",
serviceName, ss.str());
}
void DiscoveryServiceClient::Subscribe(std::string serviceName, uint8_t numbOfInstances) {
// Get Response Header
ServiceResponseMap::iterator loc = service_response_map_.find(serviceName);
if (loc != service_response_map_.end()) {
DSResponseHeader *resp = loc->second;
resp->subscribe_timer_->Cancel();
resp->sub_sent_++;
resp->subscribe_cb_called_ = false;
SendHttpPostMessage("subscribe", serviceName, resp->subscribe_msg_);
}
}
void DiscoveryServiceClient::UnsubscribeInternal(std::string serviceName) {
ServiceResponseMap::iterator loc = service_response_map_.find(serviceName);
if (loc != service_response_map_.end()) {
DSResponseHeader *resp = loc->second;
service_response_map_.erase(loc);
delete resp;
/* Remove registered subscribe callback handler */
UnRegisterSubscribeResponseHandler(serviceName);
}
}
void DiscoveryServiceClient::Unsubscribe(std::string serviceName) {
assert(shutdown_ == false);
work_queue_.Enqueue(boost::bind(&DiscoveryServiceClient::UnsubscribeInternal,
this, serviceName));
}
void DiscoveryServiceClient::SubscribeResponseHandler(std::string &xmls,
boost::system::error_code &ec,
std::string serviceName,
HttpConnection *conn)
{
// Connection will be deleted on complete transfer
// on indication by the http client code.
// Get Response Header
DSResponseHeader *hdr = NULL;
ServiceResponseMap::iterator loc = service_response_map_.find(serviceName);
if (loc != service_response_map_.end()) {
hdr = loc->second;
} else {
DISCOVERY_CLIENT_LOG_ERROR(DiscoveryClientLog, serviceName,
"Stray Subscribe Response");
if (conn) {
http_client_->RemoveConnection(conn);
}
// Update connection info
ConnectionState::GetInstance()->Update(ConnectionType::DISCOVERY,
serviceName, ConnectionStatus::DOWN, ds_endpoint_,
"Stray Subscribe Response");
return;
}
if (xmls.empty()) {
if (conn) {
http_client_->RemoveConnection(conn);
}
// Errorcode is of type CURLcode
if (ec.value() != 0) {
DISCOVERY_CLIENT_TRACE(DiscoveryClientErrorMsg,
"Error SubscribeResponseHandler ",
serviceName + " " + curl_error_category.message(ec.value()),
ec.value());
// exponential back-off and retry
hdr->attempts_++;
hdr->sub_fail_++;
// Update connection info
ConnectionState::GetInstance()->Update(ConnectionType::DISCOVERY,
serviceName, ConnectionStatus::DOWN, ds_endpoint_, ec.message());
hdr->StartSubscribeTimer(hdr->GetConnectTime());
} else if (hdr->subscribe_cb_called_ == false) {
DISCOVERY_CLIENT_TRACE(DiscoveryClientErrorMsg,
"SubscribeResponseHandler, Only header received",
serviceName, ec.value());
// exponential back-off and retry
hdr->attempts_++;
hdr->sub_fail_++;
// Update connection info
ConnectionState::GetInstance()->Update(ConnectionType::DISCOVERY,
serviceName, ConnectionStatus::DOWN, ds_endpoint_,
"Only header received");
hdr->StartSubscribeTimer(hdr->GetConnectTime());
}
return;
}
hdr->subscribe_cb_called_= true;
//Parse the xml string and build DSResponse
auto_ptr<XmlBase> impl(XmppXmlImplFactory::Instance()->GetXmlImpl());
if (impl->LoadDoc(xmls) == -1) {
DISCOVERY_CLIENT_TRACE(DiscoveryClientErrorMsg,
"SubscribeResponseHandler: Loading Xml Doc failed!!",
serviceName, ec.value());
// exponential back-off and retry
hdr->attempts_++;
hdr->sub_fail_++;
// Update connection info
ConnectionState::GetInstance()->Update(ConnectionType::DISCOVERY,
serviceName, ConnectionStatus::DOWN, ds_endpoint_,
"Loading Xml Doc Failed");
hdr->StartSubscribeTimer(hdr->GetConnectTime());
return;
}
//Extract ttl
uint32_t ttl = 0;
stringstream docs;
XmlPugi *pugi = reinterpret_cast<XmlPugi *>(impl.get());
pugi::xml_node node_ttl = pugi->FindNode("ttl");
if (!pugi->IsNull(node_ttl)) {
string value(node_ttl.child_value());
boost::trim(value);
stringstream ss(value);
ss >> ttl;
// Delete ttl for checksum calculation
pugi->DeleteNode("ttl");
impl->PrintDoc(docs);
}
pugi::xml_node node = pugi->FindNode("response");
std::vector<DSResponse> ds_response;
if (!pugi->IsNull(node)) {
std::string serviceTag = node.first_child().name();
for (node = node.first_child(); node; node = node.next_sibling()) {
DSResponse resp;
/* TODO: autogenerate with <choice> support */
for (pugi::xml_node subnode = node.first_child(); subnode;
subnode = subnode.next_sibling()) {
string value(subnode.child_value());
boost::trim(value);
if (strcmp(subnode.name(), "ip-address") == 0) {
resp.ep.address(ip::address::from_string(value));
} else if (strcmp(subnode.name(), "port") == 0) {
uint32_t port;
stringstream sport(value);
sport >> port;
resp.ep.port(port);
}
}
ds_response.push_back(resp);
}
// generate hash of the message
boost::hash<std::string> string_hash;
uint32_t gen_chksum = string_hash(docs.str());
hdr->sub_rcvd_++;
hdr->attempts_ = 0;
if (ds_response.size() == 0) {
//Restart Subscribe Timer
hdr->StartSubscribeTimer(ttl);
DISCOVERY_CLIENT_TRACE(DiscoveryClientMsg, "SubscribeResponseHandler",
serviceName, xmls);
// Update connection info
ConnectionState::GetInstance()->Update(ConnectionType::DISCOVERY,
serviceName, ConnectionStatus::UP, ds_endpoint_,
"SubscribeResponse");
return; //No change in message, ignore
}
if (hdr->chksum_ != gen_chksum) {
DISCOVERY_CLIENT_TRACE(DiscoveryClientMsg, "SubscribeResponseHandler",
serviceName, xmls);
}
// Update connection info
ConnectionState::GetInstance()->Update(ConnectionType::DISCOVERY,
serviceName, ConnectionStatus::UP, ds_endpoint_,
"SubscribeResponse");
// Update DSResponseHeader for first response or change in response
hdr->chksum_ = gen_chksum;
hdr->service_list_.clear();
hdr->service_list_ = ds_response;
//Start Subscribe Timer
hdr->StartSubscribeTimer(ttl);
// Call the Registered Handler building DSResponse from xml-string
SubscribeResponseHandlerMap::iterator it = subscribe_map_.find(serviceName);
if (it != subscribe_map_.end()) {
ServiceHandler cb = it->second;
cb(ds_response);
}
} else {
pugi::xml_node node = pugi->FindNode("h1");
if (!pugi->IsNull(node)) {
std::string response = node.child_value();
// 503, Service Unavailable
// 504, Gateway Timeout, and other errors
DISCOVERY_CLIENT_TRACE(DiscoveryClientMsg,
"SubscribeResponseHandler: Error, resend subscribe",
serviceName, xmls);
// exponential back-off and retry
hdr->attempts_++;
hdr->sub_fail_++;
// Update connection info
ConnectionState::GetInstance()->Update(ConnectionType::DISCOVERY,
serviceName, ConnectionStatus::DOWN, ds_endpoint_, response);
hdr->StartSubscribeTimer(hdr->GetConnectTime());
} else {
DISCOVERY_CLIENT_TRACE(DiscoveryClientMsg,
"SubscribeResponseHandler: No [h1] tag, resend subscribe",
serviceName, xmls);
// exponential back-off and retry
hdr->attempts_++;
hdr->sub_fail_++;
// Update connection info
ConnectionState::GetInstance()->Update(ConnectionType::DISCOVERY,
serviceName, ConnectionStatus::DOWN, ds_endpoint_,
"No [h1] tag");
//Use connect timer as subscribe timer
hdr->StartSubscribeTimer(hdr->GetConnectTime());
}
}
}
void DiscoveryServiceClient::SendHeartBeat(std::string serviceName,
std::string msg) {
DSPublishResponse *resp = GetPublishResponse(serviceName);
resp->pub_hb_sent_++;
resp->heartbeat_cb_called_ = false;
SendHttpPostMessage("heartbeat", serviceName, msg);
}
void DiscoveryServiceClient::HeartBeatResponseHandler(std::string &xmls,
boost::system::error_code ec,
std::string serviceName,
HttpConnection *conn) {
// Get Response Header
DSPublishResponse *resp = NULL;
PublishResponseMap::iterator loc = publish_response_map_.find(serviceName);
if (loc != publish_response_map_.end()) {
resp = loc->second;
} else {
DISCOVERY_CLIENT_LOG_ERROR(DiscoveryClientLog, serviceName,
"Stray HeartBeat Response");
if (conn) {
http_client_->RemoveConnection(conn);
}
// Update connection info
ConnectionState::GetInstance()->Update(ConnectionType::DISCOVERY,
serviceName, ConnectionStatus::DOWN, ds_endpoint_,
"Stray HeartBeat Response");
return;
}
// Connection will be deleted on complete transfer
// on indication by the http client code.
if (xmls.empty()) {
if (conn) {
http_client_->RemoveConnection(conn);
}
// Errorcode is of type CURLcode
if (ec.value() != 0) {
resp->pub_hb_fail_++;
// Resend original publish request after exponential back-off
resp->attempts_++;
// CURLE_OPERATION_TIMEDOUT, timeout triggered when no
// response from Discovery Server for 4secs.
if (curl_error_category.message(ec.value()).find("Timeout") !=
std::string::npos) {
resp->pub_hb_timeout_++;
if (resp->attempts_ <= 3) {
// Make client resilient to heart beat misses.
// Continue sending heartbeat
return;
} else {
// reset attempts so publish can be sent right away
resp->attempts_ = 0;
}
} else {
DISCOVERY_CLIENT_TRACE(DiscoveryClientErrorMsg,
"Error HeartBeatResponseHandler ",
serviceName + " " + curl_error_category.message(ec.value()),
ec.value());
}
// Update connection info
ConnectionState::GetInstance()->Update(ConnectionType::DISCOVERY,
serviceName, ConnectionStatus::DOWN, ds_endpoint_,
ec.message());
resp->StopHeartBeatTimer();
resp->StartPublishConnectTimer(resp->GetConnectTime());
} else if (resp->heartbeat_cb_called_ == false) {
DISCOVERY_CLIENT_TRACE(DiscoveryClientErrorMsg,
"HeartBeatResponseHandler, Only header received",
serviceName, ec.value());
resp->pub_hb_fail_++;
resp->StopHeartBeatTimer();
// Resend original publish request after exponential back-off
resp->attempts_++;
// Update connection info
ConnectionState::GetInstance()->Update(ConnectionType::DISCOVERY,
serviceName, ConnectionStatus::DOWN, ds_endpoint_,
"Only header received");
resp->StartPublishConnectTimer(resp->GetConnectTime());
}
return;
}
resp->heartbeat_cb_called_ = true;
if (xmls.find("200 OK") == std::string::npos) {
DISCOVERY_CLIENT_TRACE(DiscoveryClientMsg,
"HeartBeatResponseHandler Not OK, resend publish",
serviceName, xmls);
//response is not OK, resend publish
resp->pub_hb_fail_++;
resp->StopHeartBeatTimer();
resp->attempts_++;
// Update connection info
ConnectionState::GetInstance()->Update(ConnectionType::DISCOVERY,
serviceName, ConnectionStatus::DOWN, ds_endpoint_,
"HeartBeatResponse NOT 200 OK");
resp->StartPublishConnectTimer(resp->GetConnectTime());
return;
}
resp->pub_hb_rcvd_++;