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response_publisher.cpp
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response_publisher.cpp
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#include "response_publisher.h"
#include <fstream>
#include <memory>
#include <string>
#include <vector>
namespace
{
// Returns the component string that we need to prepend for sending the error
// message.
// Returns an empty string if the status is OK.
// Returns "[SAI] " if the ReturnCode is generated from a SAI status code.
// Else, returns "[OrchAgent] ".
std::string PrependedComponent(const ReturnCode &status)
{
constexpr char *kOrchagentComponent = "[OrchAgent] ";
constexpr char *kSaiComponent = "[SAI] ";
if (status.ok())
{
return "";
}
if (status.isSai())
{
return kSaiComponent;
}
return kOrchagentComponent;
}
void RecordDBWrite(const std::string &table, const std::string &key, const std::vector<swss::FieldValueTuple> &attrs,
const std::string &op)
{
if (!swss::Recorder::Instance().respub.isRecord())
{
return;
}
std::string s = table + ":" + key + "|" + op;
for (const auto &attr : attrs)
{
s += "|" + fvField(attr) + ":" + fvValue(attr);
}
swss::Recorder::Instance().respub.record(s);
}
void RecordResponse(const std::string &response_channel, const std::string &key,
const std::vector<swss::FieldValueTuple> &attrs, const std::string &status)
{
if (!swss::Recorder::Instance().respub.isRecord())
{
return;
}
std::string s = response_channel + ":" + key + "|" + status;
for (const auto &attr : attrs)
{
s += "|" + fvField(attr) + ":" + fvValue(attr);
}
swss::Recorder::Instance().respub.record(s);
}
} // namespace
ResponsePublisher::ResponsePublisher(const std::string &dbName, bool buffered, bool db_write_thread)
: m_db(std::make_unique<swss::DBConnector>(dbName, 0)), m_buffered(buffered)
{
if (m_buffered)
{
m_ntf_pipe = std::make_unique<swss::RedisPipeline>(m_db.get());
m_db_pipe = std::make_unique<swss::RedisPipeline>(m_db.get());
}
else
{
m_ntf_pipe = std::make_unique<swss::RedisPipeline>(m_db.get(), 1);
m_db_pipe = std::make_unique<swss::RedisPipeline>(m_db.get(), 1);
}
if (db_write_thread)
{
m_update_thread = std::unique_ptr<std::thread>(new std::thread(&ResponsePublisher::dbUpdateThread, this));
}
}
ResponsePublisher::~ResponsePublisher()
{
if (m_update_thread != nullptr)
{
{
std::lock_guard<std::mutex> lock(m_lock);
m_queue.emplace(/*table=*/"", /*key=*/"", /*values =*/std::vector<swss::FieldValueTuple>{}, /*op=*/"",
/*replace=*/false, /*flush=*/false, /*shutdown=*/true);
}
m_signal.notify_one();
m_update_thread->join();
}
}
void ResponsePublisher::publish(const std::string &table, const std::string &key,
const std::vector<swss::FieldValueTuple> &intent_attrs, const ReturnCode &status,
const std::vector<swss::FieldValueTuple> &state_attrs, bool replace)
{
std::string response_channel = "APPL_DB_" + table + "_RESPONSE_CHANNEL";
swss::NotificationProducer notificationProducer{m_ntf_pipe.get(), response_channel, m_buffered};
auto intent_attrs_copy = intent_attrs;
// Add error message as the first field-value-pair.
swss::FieldValueTuple err_str("err_str", PrependedComponent(status) + status.message());
intent_attrs_copy.insert(intent_attrs_copy.begin(), err_str);
// Sends the response to the notification channel.
notificationProducer.send(status.codeStr(), key, intent_attrs_copy);
RecordResponse(response_channel, key, intent_attrs_copy, status.codeStr());
// Write to the DB only if:
// 1) A write operation is being performed and state attributes are specified.
// 2) A successful delete operation.
if ((intent_attrs.size() && state_attrs.size()) || (status.ok() && !intent_attrs.size()))
{
writeToDB(table, key, state_attrs, intent_attrs.size() ? SET_COMMAND : DEL_COMMAND, replace);
}
}
void ResponsePublisher::publish(const std::string &table, const std::string &key,
const std::vector<swss::FieldValueTuple> &intent_attrs, const ReturnCode &status,
bool replace)
{
// If status is OK then intent attributes need to be written in
// APPL_STATE_DB. In this case, pass the intent attributes as state
// attributes. In case of a failure status, nothing needs to be written in
// APPL_STATE_DB.
std::vector<swss::FieldValueTuple> state_attrs;
if (status.ok())
{
state_attrs = intent_attrs;
}
publish(table, key, intent_attrs, status, state_attrs, replace);
}
void ResponsePublisher::writeToDB(const std::string &table, const std::string &key,
const std::vector<swss::FieldValueTuple> &values, const std::string &op, bool replace)
{
if (m_update_thread != nullptr)
{
{
std::lock_guard<std::mutex> lock(m_lock);
m_queue.emplace(table, key, values, op, replace, /*flush=*/false, /*shutdown=*/false);
}
m_signal.notify_one();
}
else
{
writeToDBInternal(table, key, values, op, replace);
}
RecordDBWrite(table, key, values, op);
}
void ResponsePublisher::writeToDBInternal(const std::string &table, const std::string &key,
const std::vector<swss::FieldValueTuple> &values, const std::string &op,
bool replace)
{
swss::Table applStateTable{m_db_pipe.get(), table, m_buffered};
auto attrs = values;
if (op == SET_COMMAND)
{
if (replace)
{
applStateTable.del(key);
}
if (!values.size())
{
attrs.push_back(swss::FieldValueTuple("NULL", "NULL"));
}
// Write to DB only if the key does not exist or non-NULL attributes are
// being written to the entry.
std::vector<swss::FieldValueTuple> fv;
if (!applStateTable.get(key, fv))
{
applStateTable.set(key, attrs);
return;
}
for (auto it = attrs.cbegin(); it != attrs.cend();)
{
if (it->first == "NULL")
{
it = attrs.erase(it);
}
else
{
it++;
}
}
if (attrs.size())
{
applStateTable.set(key, attrs);
}
}
else if (op == DEL_COMMAND)
{
applStateTable.del(key);
}
}
void ResponsePublisher::flush()
{
m_ntf_pipe->flush();
if (m_update_thread != nullptr)
{
{
std::lock_guard<std::mutex> lock(m_lock);
m_queue.emplace(/*table=*/"", /*key=*/"", /*values =*/std::vector<swss::FieldValueTuple>{}, /*op=*/"",
/*replace=*/false, /*flush=*/true, /*shutdown=*/false);
}
m_signal.notify_one();
}
else
{
m_db_pipe->flush();
}
}
void ResponsePublisher::setBuffered(bool buffered)
{
m_buffered = buffered;
}
void ResponsePublisher::dbUpdateThread()
{
while (true)
{
entry e;
{
std::unique_lock<std::mutex> lock(m_lock);
while (m_queue.empty())
{
m_signal.wait(lock);
}
e = m_queue.front();
m_queue.pop();
}
if (e.shutdown)
{
break;
}
if (e.flush)
{
m_db_pipe->flush();
}
else
{
writeToDBInternal(e.table, e.key, e.values, e.op, e.replace);
}
}
}