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/** Implementation of the pqxx::connection and sibling classes.
*
* Different ways of setting up a backend connection.
*
* Copyright (c) 2000-2019, Jeroen T. Vermeulen.
*
* See COPYING for copyright license. If you did not receive a file called
* COPYING with this source code, please notify the distributor of this mistake,
* or contact the author.
*/
#include "pqxx/compiler-internal.hxx"
#include <stdexcept>
extern "C"
{
#include "libpq-fe.h"
}
#include "pqxx/connection"
pqxx::connectionpolicy::connectionpolicy(const std::string &opts) :
m_options{opts}
{
}
pqxx::connectionpolicy::~connectionpolicy() noexcept
{
}
pqxx::connectionpolicy::handle
pqxx::connectionpolicy::normalconnect(handle orig)
{
if (orig) return orig;
orig = PQconnectdb(options().c_str());
if (orig == nullptr) throw std::bad_alloc{};
if (PQstatus(orig) != CONNECTION_OK)
{
const std::string msg{PQerrorMessage(orig)};
PQfinish(orig);
throw broken_connection{msg};
}
return orig;
}
pqxx::connectionpolicy::handle
pqxx::connectionpolicy::do_startconnect(handle orig)
{
return orig;
}
pqxx::connectionpolicy::handle
pqxx::connectionpolicy::do_completeconnect(handle orig)
{
return orig;
}
pqxx::connectionpolicy::handle
pqxx::connectionpolicy::do_dropconnect(handle orig) noexcept
{
return orig;
}
pqxx::connectionpolicy::handle
pqxx::connectionpolicy::do_disconnect(handle orig) noexcept
{
orig = do_dropconnect(orig);
if (orig) PQfinish(orig);
return nullptr;
}
bool pqxx::connectionpolicy::is_ready(handle h) const noexcept
{
return h != nullptr;
}
pqxx::connectionpolicy::handle
pqxx::connect_direct::do_startconnect(handle orig)
{
if (orig) return orig;
orig = normalconnect(orig);
if (PQstatus(orig) != CONNECTION_OK)
{
const std::string msg{PQerrorMessage(orig)};
do_disconnect(orig);
throw broken_connection{msg};
}
return orig;
}
pqxx::connectionpolicy::handle
pqxx::connect_lazy::do_completeconnect(handle orig)
{
return normalconnect(orig);
}
pqxx::connect_async::connect_async(const std::string &opts) :
connectionpolicy{opts},
m_connecting{false}
{
}
pqxx::connectionpolicy::handle
pqxx::connect_async::do_startconnect(handle orig)
{
if (orig != nullptr) return orig; // Already connecting or connected.
m_connecting = false;
orig = PQconnectStart(options().c_str());
if (orig == nullptr) throw std::bad_alloc{};
if (PQstatus(orig) == CONNECTION_BAD)
{
do_dropconnect(orig);
throw broken_connection{std::string{PQerrorMessage(orig)}};
}
m_connecting = true;
return orig;
}
pqxx::connectionpolicy::handle
pqxx::connect_async::do_completeconnect(handle orig)
{
const bool makenew = (orig == nullptr);
if (makenew) orig = do_startconnect(orig);
if (not m_connecting) return orig;
// Our "attempt to connect" state ends here, for better or for worse
m_connecting = false;
PostgresPollingStatusType pollstatus = PGRES_POLLING_WRITING;
do
{
switch (pollstatus)
{
case PGRES_POLLING_FAILED:
if (makenew) do_disconnect(orig);
throw broken_connection{std::string{PQerrorMessage(orig)}};
case PGRES_POLLING_READING:
internal::wait_read(orig);
break;
case PGRES_POLLING_WRITING:
internal::wait_write(orig);
break;
case PGRES_POLLING_OK:
break;
default:
// Meaningless, really, but deals with the obsolete PGRES_POLLING_ACTIVE
// without requiring it to be defined.
break;
}
pollstatus = PQconnectPoll(orig);
} while (pollstatus != PGRES_POLLING_OK);
return orig;
}
pqxx::connectionpolicy::handle
pqxx::connect_async::do_dropconnect(handle orig) noexcept
{
m_connecting = false;
return orig;
}
bool pqxx::connect_async::is_ready(handle h) const noexcept
{
return h != nullptr and not m_connecting;
}
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