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 1.36 and 1.54

version 1.36, 2001/09/18 16:05:42	version 1.54, 2001/11/11 10:53:48
Line 2	Line 2
Parser: sql driver manager implementation.	Parser: sql driver manager implementation.

Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com)	Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com)
	Author: Alexander Petrosyan <paf@design.ru> (http://paf.design.ru)

Author: Alexander Petrosyan <paf@design.ru> (http://design.ru/paf)	$Id$
*/	*/
static const char *RCSId="$Id$";

#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_stack.h"
	#include "pa_vhash.h"
	#include "pa_vtable.h"

// globals	// globals

Line 23 SQL_Driver_manager *SQL_driver_manager;	Line 26 SQL_Driver_manager *SQL_driver_manager;
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

	const String& url_without_login(Pool& pool, const String& url) {
	String& result=*new(pool) String(pool);
	result << url.mid(0, url.pos(":")) << "://****";

	int at_pos=url.pos("@");
	if(at_pos>0)
	result << url.mid(at_pos, url.size());

	return result;
	}

/// SQL_Driver_services Pooled implementation	/// SQL_Driver_services Pooled implementation
class SQL_Driver_services_impl : public SQL_Driver_services, public Pooled {	class SQL_Driver_services_impl : public SQL_Driver_services, public Pooled {
Line 31 public:	Line 46 public:
furl(aurl) {	furl(aurl) {
}	}

/// allocates some bytes on pool	virtual void *malloc(size_t size) { return Pooled::malloc(size, 8); }
void *malloc(size_t size) { return Pooled::malloc(size); }	virtual void *calloc(size_t size) { return Pooled::calloc(size); }
/// allocates some bytes clearing them with zeros
void *calloc(size_t size) { return Pooled::calloc(size); }	/**
/// throw exception	the idea is to #1 jump to C++ some function to main body, where
void _throw(const char *comment) {	every function stack frame has exception unwind information
THROW(0, 0,	and from there... #2 propagate_exception()
&furl,	*/
	virtual void _throw(const char *comment) {
	// hiding passwords and addresses from accidental show [imagine user forgot @exception]
	e=Exception(0, 0,
	&url_without_login(pool(), furl),
comment);	comment);

	longjmp(mark, 1);
	}
	virtual void propagate_exception() {
	throw e;
}	}

private:	private:
const String& furl;	const String& furl;
	Exception e;
};	};

	// helpers

	static void expire_connection(Array::Item value, void info) {
	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);
	}

// SQL_Driver_manager	// SQL_Driver_manager

	SQL_Driver_manager::SQL_Driver_manager(Pool& apool) : Cache_manager(apool),
	driver_cache(apool),
	connection_cache(apool),
	prev_expiration_pass_time(0) {
	}

	SQL_Driver_manager::~SQL_Driver_manager() {
	connection_cache.for_each(expire_connections,
	reinterpret_cast<void >((time_t)0/=in past=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_Connection& SQL_Driver_manager::get_connection(const String& request_url,
const String& request_origin,	const String& request_origin,
Line 56 SQL_Connection& SQL_Driver_manager::get_	Line 107 SQL_Connection& SQL_Driver_manager::get_

// 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(0, 0,
&request_url,	&request_url,
"$"MAIN_SQL_NAME":"MAIN_SQL_DRIVERS_NAME" table must be defined");	"$"MAIN_SQL_NAME":"MAIN_SQL_DRIVERS_NAME" table must be defined");

	// construct services[request] (deassociates at close)
	SQL_Driver_services *services=new(pool) SQL_Driver_services_impl(pool, request_url);

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

char *request_url_cstr;	char *request_url_cstr;
Line 73 SQL_Connection& SQL_Driver_manager::get_	Line 130 SQL_Connection& SQL_Driver_manager::get_
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(0, 0,
request_url.size()?&request_url:&request_origin,	request_url.size()?&request_url:&request_origin,
"connection string must start with protocol://"); // NOTE: not THROW, but PTHROW	"connection string must start with protocol://"); // NOTE: not THROW, but PTHROW

// 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 96 SQL_Connection& SQL_Driver_manager::get_	Line 153 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(0, 0,
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(0, 0,
&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, 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_SPEC);	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, 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,
SQL_DRIVER_CREATE_NAME);	SQL_DRIVER_CREATE_NAME);
if(!create)	if(!create)
PTHROW(0, 0,	throw Exception(0, 0,
library,	library,
"function '"SQL_DRIVER_CREATE_NAME"' was not found");	"function '"SQL_DRIVER_CREATE_NAME"' was not found");

Line 139 SQL_Connection& SQL_Driver_manager::get_	Line 196 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, 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_SPEC):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, 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 165 SQL_Connection& SQL_Driver_manager::get_	Line 221 SQL_Connection& SQL_Driver_manager::get_
// 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);	result=new(this->pool()) SQL_Connection(this->pool(), global_url, *driver);
	// associate with services[request] (deassociates at close)
	result->set_services(services);
}	}

// associate with services[request] (deassociates at close)
result->set_services(new(pool) SQL_Driver_services_impl(pool, request_url));
// if not connected yet, do that now, when result has services	// if not connected yet, do that now, when result has services
if(!result->connected())	if(!result->connected())
result->connect(request_url_cstr);	result->connect(request_url_cstr);
Line 204 void SQL_Driver_manager::put_driver_to_c	Line 260 void SQL_Driver_manager::put_driver_to_c
SQL_Connection *SQL_Driver_manager::get_connection_from_cache(const String& url) {	SQL_Connection *SQL_Driver_manager::get_connection_from_cache(const String& 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 228 void SQL_Driver_manager::put_connection_	Line 282 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 250 void SQL_Driver_manager::maybe_expire_co	Line 292 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_stamp=connection.get_time_stamp();
	const char *unsafe_time_cstr=ctime(&time_stamp);
	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);
	}


	Value& SQL_Driver_manager::get_status(Pool& pool, const String *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.1.36
changed lines
	Added in v.1.54