--- parser3/src/main/pa_sql_driver_manager.C 2001/04/04 11:47:29 1.2 +++ parser3/src/main/pa_sql_driver_manager.C 2003/12/11 09:22:09 1.78 @@ -1,155 +1,281 @@ /** @file Parser: sql driver manager implementation. - Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com) - - Author: Alexander Petrosyan (http://design.ru/paf) - - $Id: pa_sql_driver_manager.C,v 1.2 2001/04/04 11:47:29 paf Exp $ + Copyright (c) 2001-2003 ArtLebedev Group (http://www.artlebedev.com) + Author: Alexandr Petrosian (http://paf.design.ru) */ -#include "pa_config_includes.h" -#include "ltdl.h" +static const char * const IDENT_SQL_DRIVER_MANAGER_C="$Date: 2003/12/11 09:22:09 $"; + #include "pa_sql_driver_manager.h" +#include "ltdl.h" +#include "pa_threads.h" #include "pa_sql_connection.h" #include "pa_exception.h" #include "pa_common.h" +#include "pa_vhash.h" +#include "pa_vtable.h" // globals -SQL_Driver_manager *SQL_driver_manager; +SQL_Driver_manager* SQL_driver_manager=0; // consts -const int MAX_PROTOCOL=20; -const char *LIBRARY_CREATE_FUNC_NAME="create"; +const time_t EXPIRE_UNUSED_CONNECTION_SECONDS=60; +const time_t CHECK_EXPIRED_CONNECTIONS_SECONDS=EXPIRE_UNUSED_CONNECTION_SECONDS*2; -// url: -// protocol://user:pass@host:port/database -// ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this is driver-dependent -SQL_Connection& SQL_Driver_manager::get_connection(const String& url, - Table *protocol2library) { - SYNCHRONIZED(true); +// helpers - Pool& pool=url.pool(); // request pool +const String& SQL_Driver_services_impl::url_without_login() const { + String& result=*new String; + result << furl->mid(0, furl->pos(':')) << "://****"; - // we have table for locating protocol's library - if(!protocol2library) - PTHROW(0, 0, - &url, - "SQL:drivers table must be defined"); + size_t at_pos=furl->pos('@'); + if(at_pos!=STRING_NOT_FOUND) + result << furl->mid(at_pos, furl->length()); - // first trying to get cached connection - if(SQL_Connection *result=get_connection_from_cache(url)) - return *result; - // no cached connection - - int pos=url.pos("://", 3); - if(pos<0) - PTHROW(0, 0, - &url, - "no protocol specified"); // NOTE: not THROW, but PTHROW - - // make url string on global pool - char *url_cstr=(char *)malloc(MAX_STRING); - strncpy(url_cstr, url.cstr(String::UL_AS_IS), MAX_STRING); - - char *protocol_cstr=lsplit(&url_cstr, ':'); - String& protocol=*new(this->pool()) String(this->pool(), protocol_cstr); + return result; +} - // skip // after : - while(*url_cstr=='/') - url_cstr++; - - SQL_Driver *driver; - // first trying to get cached driver - if(!(driver=get_driver_from_cache(protocol))) { - // no cached - const String *library=0; - if(protocol2library->locate(0, protocol)) { - if(!(library=protocol2library->item(1)) || library->size()==0) - PTHROW(0, 0, - protocol2library->origin_string(), - "library column for protocol '%s' is empty", protocol_cstr); - } else - PTHROW(0, 0, - &url, - "undefined protocol '%s'", protocol_cstr); - - const char *filename=library->cstr(String::UL_FILE_NAME); - lt_dlhandle handle=lt_dlopen(filename); - if (!handle) - PTHROW(0, 0, - library, - "can not open the module, %s", lt_dlerror()); - - SQL_Driver_create_func create=(SQL_Driver_create_func)lt_dlsym(handle, - LIBRARY_CREATE_FUNC_NAME); - if(!create) - PTHROW(0, 0, - library, - "function '%s' was not found", LIBRARY_CREATE_FUNC_NAME); - - // create library-driver! - driver=(*create)(); - - // validate driver api version - int driver_api_version=driver->api_version(); - if(driver_api_versiontop_index(); i++) + expire_connection(*stack->get(i), older_dies); +} - // cache it - put_driver_to_cache(protocol, *driver); +// SQL_Driver_manager + +SQL_Driver_manager::SQL_Driver_manager(): + is_dlinited(false), 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*/); + + if(is_dlinited) + lt_dlexit(); +} + +/// @param aurl protocol://[driver-dependent] +SQL_Connection* SQL_Driver_manager::get_connection(const String& aurl, + Table *protocol2driver_and_client) { + // we have table for locating protocol's library + if(!protocol2driver_and_client) + throw Exception("parser.runtime", + &aurl, + "$"MAIN_SQL_NAME":"MAIN_SQL_DRIVERS_NAME" table must be defined"); + + // first trying to get cached connection + SQL_Connection* connection=get_connection_from_cache(aurl); + if(connection) { + connection->set_url(); + if(!connection->ping()) { // we have some cached connection, is it pingable? + connection->disconnect(); // kill unpingabe=dead connection + connection=0; + } } + + char *url_cstr; + if(connection) + url_cstr=0; // calm, compiler + else { // no cached connection or it were unpingabe: connect/reconnect + url_cstr=aurl.cstrm(); + if(!strstr(url_cstr, "://")) + throw Exception("parser.runtime", + aurl.length()?&aurl:0, + "connection string must start with protocol://"); + + + char *protocol_cstr=lsplit(&url_cstr, ':'); + // skip "//" after ':' + while(*url_cstr=='/') + url_cstr++; + const String& protocol=*new String(protocol_cstr); + + SQL_Driver *driver; + // first trying to get cached driver + if(!(driver=get_driver_from_cache(protocol))) { + // no cached + const String* library=0; + const String* dlopen_file_spec=0; + Table::Action_options options; + if(protocol2driver_and_client->locate(0, protocol, options)) { + if(!(library=protocol2driver_and_client->item(1)) || library->length()==0) + throw Exception("parser.runtime", + 0, + "driver library column for protocol '%s' is empty", + protocol_cstr); + dlopen_file_spec=protocol2driver_and_client->item(2); + } else + throw Exception("parser.runtime", + &aurl, + "undefined protocol '%s'", + protocol_cstr); + + if(!is_dlinited) { + if(lt_dlinit()) + throw Exception(0, + library, + "prepare to dynamic loading failed, %s", lt_dlerror()); + + is_dlinited=true; + } + + const char* filename=library->cstr(String::L_FILE_SPEC); + lt_dlhandle handle=lt_dlopen(filename); + if (!handle) + throw Exception(0, + library, + "can not open the module, %s", lt_dlerror()); + + SQL_Driver_create_func create=(SQL_Driver_create_func)lt_dlsym(handle, + SQL_DRIVER_CREATE_NAME); + if(!create) + throw Exception(0, + library, + "function '"SQL_DRIVER_CREATE_NAME"' was not found"); + + // create library-driver! + driver=(*create)(); + + // validate driver api version + int driver_api_version=driver->api_version(); + if(driver_api_version!=SQL_DRIVER_API_VERSION) + throw Exception(0, + library, + "driver implements API version 0x%04X not equal to 0x%04X", + driver_api_version, SQL_DRIVER_API_VERSION); + + // initialise by connecting to sql client dynamic link library + char* dlopen_file_spec_cstr= + dlopen_file_spec && dlopen_file_spec->length()? + dlopen_file_spec->cstrm(String::L_AS_IS):0; + if(const char* error=driver->initialize(dlopen_file_spec_cstr)) + throw Exception(0, + library, + "driver failed to initialize client library '%s', %s", + dlopen_file_spec_cstr?dlopen_file_spec_cstr:"unspecifed", + error); + + // cache it + put_driver_to_cache(protocol, driver); + } - return *new(this->pool()) SQL_Connection(url.pool(), //< associate with request - *driver, url_cstr, url); -} + connection=new SQL_Connection(aurl, *driver); + // associate with pool[request] (deassociates at close) + connection->set_url(); + } -void SQL_Driver_manager::close_connection(const String& url, - SQL_Connection& connection) { - SYNCHRONIZED(true); + // if not connected yet, do that now, when connection has services + if(!connection->connected()) + connection->connect(url_cstr); + // return autoclosing object for it + return connection; +} - connection.set_pool(0); // deassociate from request +void SQL_Driver_manager::close_connection(connection_cache_type::key_type url, + SQL_Connection* connection) { put_connection_to_cache(url, connection); } // driver cache -SQL_Driver *SQL_Driver_manager::get_driver_from_cache(const String& protocol) { - if(SQL_Driver *result=static_cast(driver_cache.get(protocol))) - return result; +SQL_Driver *SQL_Driver_manager::get_driver_from_cache(driver_cache_type::key_type protocol) { + SYNCHRONIZED; - return 0; + return driver_cache.get(protocol); } -void SQL_Driver_manager::put_driver_to_cache(const String& protocol, - SQL_Driver& driver) { - driver_cache.put(protocol, &driver); +void SQL_Driver_manager::put_driver_to_cache( + driver_cache_type::key_type protocol, + driver_cache_type::value_type driver) { + SYNCHRONIZED; + + driver_cache.put(protocol, driver); } // connection cache - -SQL_Connection *SQL_Driver_manager::get_connection_from_cache(const String& url) { - if(Stack *connections=static_cast(connection_cache.get(url))) - if(connections->size()) // there are cached connections to that 'url' - return static_cast(connections->pop()); +/// @todo get rid of memory spending Stack [zeros deep inside got accumulated] +SQL_Connection* SQL_Driver_manager::get_connection_from_cache(connection_cache_type::key_type url) { + SYNCHRONIZED; + + if(connection_cache_type::value_type connections=connection_cache.get(url)) + while(!connections->is_empty()) { // there are cached connections to that 'url' + SQL_Connection* result=connections->pop(); + if(result->connected()) // not expired? + return result; + } return 0; } -/// @todo cache expiration[use SQL_Driver::disconnect], pinging. -void SQL_Driver_manager::put_connection_to_cache(const String& url, - SQL_Connection& connection) { - Stack *connections; - if(!(connections=static_cast(connection_cache.get(url)))) { - // there are no cached connections to that 'url' yet - connections=NEW Stack(pool()); // NOTE: never freed up! +void SQL_Driver_manager::put_connection_to_cache( + connection_cache_type::key_type url, + SQL_Connection* connection) { + SYNCHRONIZED; + + connection_cache_type::value_type connections=connection_cache.get(url); + if(!connections) { // there are no cached connections to that 'url' yet? + connections=new connection_cache_element_base_type; connection_cache.put(url, connections); } - connections->push(&connection); + connections->push(connection); +} + +void SQL_Driver_manager::maybe_expire_cache() { + time_t now=time(0); + + if(prev_expiration_pass_time i(*stack); i.has_next(); ) + add_connection_to_status_cache_table(*i.next(), table); +} + +Value* SQL_Driver_manager::get_status() { + Value* result=new VHash; + + // cache + { + ArrayString& columns=*new ArrayString; + columns+=new String("url"); + columns+=new String("time"); + Table& table=*new Table(&columns, connection_cache.count()); + + connection_cache.for_each(add_connections_to_status_cache_table, &table); + + result->get_hash()->put(*new String("cache"), new VTable(&table)); + } + + return result; }