parser3/src/main/pa_sql_driver_manager.C - diff

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Diff for /parser3/src/main/pa_sql_driver_manager.C between versions 1.32 and 1.69.2.3

version 1.32, 2001/09/05 09:22:45	version 1.69.2.3, 2003/01/27 17:17:06
Line 1	Line 1
/** @file	/** @file
Parser: sql driver manager implementation.	Parser: sql driver manager implementation.

Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com)	Copyright (c) 2001, 2003 ArtLebedev Group (http://www.artlebedev.com)
	Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
Author: Alexander Petrosyan <paf@design.ru> (http://design.ru/paf)
*/	*/
static const char *RCSId="$Id$";
	static const char* IDENT_SQL_DRIVER_MANAGER_C="$Date$";

#include "pa_sql_driver_manager.h"	#include "pa_sql_driver_manager.h"
#include "ltdl.h"	#include "ltdl.h"
Line 13 static const char *RCSId="$Id$";	Line 13 static const char *RCSId="$Id$";
#include "pa_exception.h"	#include "pa_exception.h"
#include "pa_common.h"	#include "pa_common.h"
#include "pa_threads.h"	#include "pa_threads.h"
	#include "pa_vhash.h"
#include "pa_sapi.h"	#include "pa_vtable.h"

// helper macros

#define STRINGIZE(name) #name

// globals	// globals

SQL_Driver_manager *SQL_driver_manager;	SQL_Driver_manager SQL_driver_manager;

// consts	// consts

const int EXPIRE_UNUSED_CONNECTION_SECONDS=60;	const int EXPIRE_UNUSED_CONNECTION_SECONDS=60;
const int CHECK_EXPIRED_CONNECTIONS_SECONDS=EXPIRE_UNUSED_CONNECTION_SECONDS*2;	const int CHECK_EXPIRED_CONNECTIONS_SECONDS=EXPIRE_UNUSED_CONNECTION_SECONDS*2;

	// helpers

/// SQL_Driver_services Pooled implementation	ConstStringPtr SQL_Driver_services_impl::url_without_login() const {
class SQL_Driver_services_impl : public SQL_Driver_services, public Pooled {	StringPtr result(new String);
public:	result << url->mid(0, furl->pos(":")) << "://***";
SQL_Driver_services_impl(Pool& apool, const String& aurl) : Pooled(apool),
furl(aurl) {
}

/// allocates some bytes on pool	int at_pos=url->pos("@");
void *malloc(size_t size) { return Pooled::malloc(size); }	if(at_pos>0)
/// allocates some bytes clearing them with zeros	*result << url->mid(at_pos, furl->size());
void *calloc(size_t size) { return Pooled::calloc(size); }
/// throw exception	return result;
void _throw(const char *comment) {	}
THROW(0, 0,
&furl,
comment);
}

private:	// helpers
const String& furl;
};	static void expire_connection(SQL_Connection& connection, time_t older_dies) {
	if(connection.connected() && connection.expired(older_dies))
	connection.disconnect();
	}
	static void expire_connections(
	SQL_Driver_manager::connection_cache_type::key_type /key/,
	SQL_Driver_manager::connection_cache_type::value_type stack,
	time_t older_dies) {
	for(int i=0; i<=stack->top_index(); i++)
	expire_connection(*stack->get(i), older_dies);
	}

// SQL_Driver_manager	// SQL_Driver_manager

	SQL_Driver_manager::SQL_Driver_manager():
	prev_expiration_pass_time(0) {
	}

	SQL_Driver_manager::~SQL_Driver_manager() {
	connection_cache.for_each(expire_connections, time(0)+(time_t)1/=in future=expire all/);
	}

/// @param request_url protocol://[driver-dependent]	/// @param request_url protocol://[driver-dependent]
SQL_Connection& SQL_Driver_manager::get_connection(const String& request_url,	SQL_ConnectionPtr SQL_Driver_manager::get_connection(Pool& pool, ConstStringPtr aurl,
	ConstStringPtr aorigin,
Table *protocol2driver_and_client) {	Table *protocol2driver_and_client) {
Pool& pool=request_url.pool(); // request pool

// we have table for locating protocol's library	// we have table for locating protocol's library
if(!protocol2driver_and_client)	if(!protocol2driver_and_client)
PTHROW(0, 0,	throw Exception("parser.runtime",
&request_url,	aurl,
"$"MAIN_SQL_NAME":"MAIN_SQL_DRIVERS_NAME" table must be defined");	"$"MAIN_SQL_NAME":"MAIN_SQL_DRIVERS_NAME" table must be defined");

// first trying to get cached connection	// first trying to get cached connection
SQL_Connection *result=get_connection_from_cache(request_url);	SQL_Connection *connection=get_connection_from_cache(request_url);
if(result && !result->ping()) { // we have some cached connection, is it pingable?	if(connection) {
result->disconnect(); // kill unpingabe=dead connection	connection->set_pool(pool);
result=0;	if(!connection->ping()) { // we have some cached connection, is it pingable?
	connection->disconnect(); // kill unpingabe=dead connection
	connection=0;
	}
}	}

char *request_url_cstr;	char *request_url_cstr;
if(result)	if(connection)
request_url_cstr=0; // calm, compiler	request_url_cstr=0; // calm, compiler
else { // no cached connection or it were unpingabe: connect/reconnect	else { // no cached connection or it were unpingabe: connect/reconnect
int pos=request_url.pos("://", 3);	int pos=request_url.pos("://", 3);
if(pos<0)	if(pos<0)
PTHROW(0, 0,	throw Exception("parser.runtime",
&request_url,	request_url.size()?&request_url:&request_origin,
"no protocol specified"); // NOTE: not THROW, but PTHROW	"connection string must start with protocol://");

// make global_url C-string on global pool	// make global_url C-string on global pool
request_url_cstr=request_url.cstr(String::UL_AS_IS);	request_url_cstr=request_url.cstr();
char global_url_cstr=(char )malloc(strlen(request_url_cstr)+1);	char global_url_cstr=(char )malloc(strlen(request_url_cstr)+1);
strcpy(global_url_cstr, request_url_cstr);	strcpy(global_url_cstr, request_url_cstr);
// make global_url string on global pool	// make global_url string on global pool
Line 101 SQL_Connection& SQL_Driver_manager::get_	Line 111 SQL_Connection& SQL_Driver_manager::get_
global_protocol_cstr);	global_protocol_cstr);

SQL_Driver *driver;	SQL_Driver *driver;
const String *dlopen_file_spec=0;
// first trying to get cached driver	// first trying to get cached driver
if(!(driver=get_driver_from_cache(global_protocol))) {	if(!(driver=get_driver_from_cache(global_protocol))) {
// no cached	// no cached
const String *library=0;	const String *library=0;
	const String *dlopen_file_spec=0;
if(protocol2driver_and_client->locate(0, global_protocol)) {	if(protocol2driver_and_client->locate(0, global_protocol)) {
if(!(library=protocol2driver_and_client->item(1)) \|\| library->size()==0)	if(!(library=protocol2driver_and_client->item(1)) \|\| library->size()==0)
PTHROW(0, 0,	throw Exception("parser.runtime",
protocol2driver_and_client->origin_string(),	protocol2driver_and_client->origin_string(),
"driver library column for protocol '%s' is empty",	"driver library column for protocol '%s' is empty",
request_protocol_cstr);	request_protocol_cstr);
dlopen_file_spec=protocol2driver_and_client->item(2);	dlopen_file_spec=protocol2driver_and_client->item(2);
} else	} else
PTHROW(0, 0,	throw Exception("parser.runtime",
&request_url,	&request_url,
"undefined protocol '%s'",	"undefined protocol '%s'",
request_protocol_cstr);	request_protocol_cstr);

if(lt_dlinit())	if(lt_dlinit())
PTHROW(0, 0,	throw Exception(0,
library,	library,
"prepare to dynamic loading failed, %s", lt_dlerror());	"prepare to dynamic loading failed, %s", lt_dlerror());

const char *filename=library->cstr(String::UL_FILE_NAME);	const char *filename=library->cstr(String::UL_FILE_SPEC);
lt_dlhandle handle=lt_dlopen(filename);	lt_dlhandle handle=lt_dlopen(filename);
if (!handle)	if (!handle)
PTHROW(0, 0,	throw Exception(0,
library,	library,
"can not open the module, %s", lt_dlerror());	"can not open the module, %s", lt_dlerror());

SQL_Driver_create_func create=(SQL_Driver_create_func)lt_dlsym(handle,	SQL_Driver_create_func create=(SQL_Driver_create_func)lt_dlsym(handle,
STRINGIZE(SQL_DRIVER_CREATE));	SQL_DRIVER_CREATE_NAME);
if(!create)	if(!create)
PTHROW(0, 0,	throw Exception(0,
library,	library,
"function '%s' was not found", STRINGIZE(SQL_DRIVER_CREATE));	"function '"SQL_DRIVER_CREATE_NAME"' was not found");

// create library-driver!	// create library-driver!
driver=(*create)();	driver=(*create)();
Line 144 SQL_Connection& SQL_Driver_manager::get_	Line 154 SQL_Connection& SQL_Driver_manager::get_
// validate driver api version	// validate driver api version
int driver_api_version=driver->api_version();	int driver_api_version=driver->api_version();
if(driver_api_version!=SQL_DRIVER_API_VERSION)	if(driver_api_version!=SQL_DRIVER_API_VERSION)
PTHROW(0, 0,	throw Exception(0,
library,	library,
"driver implements API version 0x%04X not equal to 0x%04X",	"driver implements API version 0x%04X not equal to 0x%04X",
driver_api_version, SQL_DRIVER_API_VERSION);	driver_api_version, SQL_DRIVER_API_VERSION);

// initialise by connecting to sql client dynamic link library	// initialise by connecting to sql client dynamic link library
bool specified_dlopen_file_spec=dlopen_file_spec && dlopen_file_spec->size();	char *dlopen_file_spec_cstr=
const char *dlopen_file_spec_cstr=	dlopen_file_spec && dlopen_file_spec->size()?
specified_dlopen_file_spec?	dlopen_file_spec->cstr(String::UL_AS_IS):0;
dlopen_file_spec->cstr(String::UL_FILE_NAME):0;
if(const char *error=driver->initialize(	if(const char *error=driver->initialize(
dlopen_file_spec_cstr))	dlopen_file_spec_cstr))
PTHROW(0, 0,	throw Exception(0,
library,	library,
"driver failed to initialize client library '%s', %s",	"driver failed to initialize client library '%s', %s",
specified_dlopen_file_spec?dlopen_file_spec_cstr:"unspecifed",	dlopen_file_spec_cstr?dlopen_file_spec_cstr:"unspecifed",
error);	error);

// cache it	// cache it
Line 169 SQL_Connection& SQL_Driver_manager::get_	Line 178 SQL_Connection& SQL_Driver_manager::get_
// allocate in global pool	// allocate in global pool
// associate with services[request]	// associate with services[request]
// NOTE: never freed up!	// NOTE: never freed up!
result=new(this->pool()) SQL_Connection(this->pool(), global_url, *driver);	connection=new(this->pool()) SQL_Connection(this->pool(), global_url, *driver);
	// associate with services[request] (deassociates at close)
	connection->set_pool(pool);
}	}

// associate with services[request] (deassociates at close)	// if not connected yet, do that now, when connection has services
result->set_services(new(pool) SQL_Driver_services_impl(pool, request_url));	if(!connection->connected())
// if not connected yet, do that now, when result has services	connection->connect(request_url_cstr);
if(!result->connected())	// return autoclosing object for it
result->connect(request_url_cstr);	return SQL_ConnectionPtr(connection);
// return it
return *result;
}	}

void SQL_Driver_manager::close_connection(const String& url,	void SQL_Driver_manager::close_connection(ConstStringPtr url,
SQL_Connection& connection) {	SQL_Connection& connection) {
// deassociate from services[request]	// deassociate from services[request]
connection.set_services(0);	connection.set_pool(0);
put_connection_to_cache(url, connection);	put_connection_to_cache(url, connection);
}	}


// driver cache	// driver cache

SQL_Driver *SQL_Driver_manager::get_driver_from_cache(const String& protocol) {	SQL_Driver *SQL_Driver_manager::get_driver_from_cache(ConstStringPtr protocol) {
SYNCHRONIZED;	SYNCHRONIZED;

return static_cast<SQL_Driver *>(driver_cache.get(protocol));	return static_cast<SQL_Driver *>(driver_cache.get(protocol));
}	}

void SQL_Driver_manager::put_driver_to_cache(const String& protocol,	void SQL_Driver_manager::put_driver_to_cache(ConstStringPtr protocol,
SQL_Driver& driver) {	SQL_Driver& driver) {
SYNCHRONIZED;	SYNCHRONIZED;

Line 206 void SQL_Driver_manager::put_driver_to_c	Line 215 void SQL_Driver_manager::put_driver_to_c

// connection cache	// connection cache
/// @todo get rid of memory spending Stack [zeros deep inside got accumulated]	/// @todo get rid of memory spending Stack [zeros deep inside got accumulated]
SQL_Connection *SQL_Driver_manager::get_connection_from_cache(const String& url) {	SQL_ConnectionPtr SQL_Driver_manager::get_connection_from_cache(ConstStringPtr url) {
SYNCHRONIZED;	SYNCHRONIZED;

maybe_expire_connection_cache();

if(Stack connections=static_cast<Stack >(connection_cache.get(url)))	if(Stack connections=static_cast<Stack >(connection_cache.get(url)))
while(connections->top_index()>=0) { // there are cached connections to that 'url'	while(connections->top_index()>=0) { // there are cached connections to that 'url'
SQL_Connection result=static_cast<SQL_Connection >(connections->pop());	SQL_Connection result=static_cast<SQL_Connection >(connections->pop());
Line 221 SQL_Connection *SQL_Driver_manager::get_	Line 228 SQL_Connection *SQL_Driver_manager::get_
return 0;	return 0;
}	}

void SQL_Driver_manager::put_connection_to_cache(const String& url,	void SQL_Driver_manager::put_connection_to_cache(ConstStringPtr url,
SQL_Connection& connection) {	SQL_Connection& connection) {
SYNCHRONIZED;	SYNCHRONIZED;

Line 233 void SQL_Driver_manager::put_connection_	Line 240 void SQL_Driver_manager::put_connection_
connections->push(&connection);	connections->push(&connection);
}	}

static void expire_connection(Array::Item value, void info) {	void SQL_Driver_manager::maybe_expire_cache() {
SQL_Connection& connection=static_cast<SQL_Connection >(value);
time_t older_dies=reinterpret_cast<time_t>(info);

if(connection.connected() && connection.expired(older_dies))
connection.disconnect();
}
static void expire_connections(const Hash::Key& key, Hash::Val value, void info) {
Stack& stack=static_cast<Stack >(value);
for(int i=0; i<=stack.top_index(); i++)
expire_connection(stack.get(i), info);
}
void SQL_Driver_manager::maybe_expire_connection_cache() {
time_t now=time(0);	time_t now=time(0);

if(prev_expiration_pass_time<now-CHECK_EXPIRED_CONNECTIONS_SECONDS) {	if(prev_expiration_pass_time<now-CHECK_EXPIRED_CONNECTIONS_SECONDS) {
Line 255 void SQL_Driver_manager::maybe_expire_co	Line 250 void SQL_Driver_manager::maybe_expire_co
prev_expiration_pass_time=now;	prev_expiration_pass_time=now;
}	}
}	}

	static void add_connection_to_status_cache_table(Array::Item value, void info) {
	SQL_Connection& connection=static_cast<SQL_Connection >(value);
	Table& table=static_cast<Table >(info);

	if(connection.connected()) {
	Pool& pool=table.pool();
	Array& row=*new(pool) Array(pool);

	// url
	row+=&url_without_login(pool, connection.get_url());
	// time
	time_t time_used=connection.get_time_used();
	const char *unsafe_time_cstr=ctime(&time_used);
	int time_buf_size=strlen(unsafe_time_cstr);
	char safe_time_buf=(char )pool.malloc(time_buf_size);
	memcpy(safe_time_buf, unsafe_time_cstr, time_buf_size);
	row+=new(pool) String(pool, safe_time_buf, time_buf_size);

	table+=&row;
	}
	}
	static void add_connections_to_status_cache_table(const Hash::Key& key, Hash::Val value, void info) {
	Stack& stack=static_cast<Stack >(value);
	Array_iter iter(stack);
	for(int countdown=stack.top_index(); countdown-->=0; )
	add_connection_to_status_cache_table(iter.next(), info);
	}
	ValuePtr SQL_Driver_manager::get_status(Pool& pool, ConstStringPtr source) {
	VHash& result=*new(pool) VHash(pool);

	// cache
	{
	Array& columns=*new(pool) Array(pool);
	columns+=new(pool) String(pool, "url");
	columns+=new(pool) String(pool, "time");
	Table& table=*new(pool) Table(pool, 0, &columns, connection_cache.size());

	connection_cache.for_each(add_connections_to_status_cache_table, &table);

	result.hash(source).put(*new(pool) String(pool, "cache"), new(pool) VTable(pool, &table));
	}

	return result;
	}

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Removed from v.1.32
changed lines
	Added in v.1.69.2.3