--- parser3/src/main/pa_sql_driver_manager.C 2001/08/27 12:02:24 1.28 +++ parser3/src/main/pa_sql_driver_manager.C 2003/12/11 09:22:09 1.78 @@ -1,254 +1,281 @@ -/** @file - Parser: sql driver manager implementation. - - Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com) - - Author: Alexander Petrosyan (http://design.ru/paf) -*/ -static const char *RCSId="$Id: pa_sql_driver_manager.C,v 1.28 2001/08/27 12:02:24 parser Exp $"; - -#include "pa_sql_driver_manager.h" -#include "ltdl.h" -#include "pa_sql_connection.h" -#include "pa_exception.h" -#include "pa_common.h" -#include "pa_threads.h" - -#include "pa_sapi.h" - -// globals - -SQL_Driver_manager *SQL_driver_manager; - -// consts - -const char *LIBRARY_CREATE_FUNC_NAME="create"; -const int EXPIRE_UNUSED_CONNECTION_SECONDS=60; -const int CHECK_EXPIRED_CONNECTIONS_SECONDS=60*2; - - -/// SQL_Driver_services Pooled implementation -class SQL_Driver_services_impl : public SQL_Driver_services, public Pooled { -public: - SQL_Driver_services_impl(Pool& apool, const String& aurl) : Pooled(apool), - furl(aurl) { - } - - /// allocates some bytes on pool - void *malloc(size_t size) { return Pooled::malloc(size); } - /// allocates some bytes clearing them with zeros - void *calloc(size_t size) { return Pooled::calloc(size); } - /// throw exception - void _throw(const char *comment) { - THROW(0, 0, - &furl, - comment); - } - -private: - const String& furl; -}; - -// SQL_Driver_manager - -/// @param request_url protocol://[driver-dependent] -SQL_Connection& SQL_Driver_manager::get_connection(const String& request_url, - Table *protocol2driver_and_client) { - Pool& pool=request_url.pool(); // request pool - - // we have table for locating protocol's library - if(!protocol2driver_and_client) - PTHROW(0, 0, - &request_url, - "$SQL:drivers table must be defined"); - - // first trying to get cached connection - SQL_Connection *result=get_connection_from_cache(request_url); - if(result && !result->ping()) { // we have some cached connection, is it pingable? - result->disconnect(); // kill unpingabe=dead connection - result=0; - } - - char *request_url_cstr; - if(result) - request_url_cstr=0; // calm, compiler - else { // no cached connection or it were unpingabe: connect/reconnect - int pos=request_url.pos("://", 3); - if(pos<0) - PTHROW(0, 0, - &request_url, - "no protocol specified"); // NOTE: not THROW, but PTHROW - - // make global_url C-string on global pool - request_url_cstr=request_url.cstr(String::UL_AS_IS); - char *global_url_cstr=(char *)malloc(strlen(request_url_cstr)+1); - strcpy(global_url_cstr, request_url_cstr); - // make global_url string on global pool - String& global_url=*new(this->pool()) String(this->pool(), global_url_cstr); - - char *request_protocol_cstr=lsplit(&request_url_cstr, ':'); - // skip "//" after ':' - while(*request_url_cstr=='/') - request_url_cstr++; - // make global_protocol C-string on global pool - char *global_protocol_cstr=(char *)malloc(strlen(request_protocol_cstr)+1); - strcpy(global_protocol_cstr, request_protocol_cstr); - // make global_protocol string on global pool - String& global_protocol=*new(this->pool()) String(this->pool(), - global_protocol_cstr); - - SQL_Driver *driver; - const String *dlopen_file_spec=0; - // first trying to get cached driver - if(!(driver=get_driver_from_cache(global_protocol))) { - // no cached - const String *library=0; - if(protocol2driver_and_client->locate(0, global_protocol)) { - if(!(library=protocol2driver_and_client->item(1)) || library->size()==0) - PTHROW(0, 0, - protocol2driver_and_client->origin_string(), - "driver library column for protocol '%s' is empty", - request_protocol_cstr); - dlopen_file_spec=protocol2driver_and_client->item(2); - } else - PTHROW(0, 0, - &request_url, - "undefined protocol '%s'", - request_protocol_cstr); - - if(lt_dlinit()) - PTHROW(0, 0, - library, - "prepare to dynamic loading failed, %s", lt_dlerror()); - - 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_version!=SQL_DRIVER_API_VERSION) - PTHROW(0, 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 - bool specified_dlopen_file_spec=dlopen_file_spec && dlopen_file_spec->size(); - const char *dlopen_file_spec_cstr= - specified_dlopen_file_spec? - dlopen_file_spec->cstr(String::UL_FILE_NAME):0; - if(const char *error=driver->initialize( - dlopen_file_spec_cstr)) - PTHROW(0, 0, - library, - "driver failed to initialize client library '%s', %s", - specified_dlopen_file_spec?dlopen_file_spec_cstr:"unspecifed", - error); - - // cache it - put_driver_to_cache(global_protocol, *driver); - } - - // allocate in global pool - // associate with services[request] - // NOTE: never freed up! - result=new(this->pool()) SQL_Connection(this->pool(), global_url, *driver); - } - - // 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(!result->connected()) - result->connect(request_url_cstr); - // return it - return *result; -} - -void SQL_Driver_manager::close_connection(const String& url, - SQL_Connection& connection) { - // deassociate from services[request] - connection.set_services(0); - put_connection_to_cache(url, connection); -} - - -// driver cache - -SQL_Driver *SQL_Driver_manager::get_driver_from_cache(const String& protocol) { - SYNCHRONIZED; - - return static_cast(driver_cache.get(protocol)); -} - -void SQL_Driver_manager::put_driver_to_cache(const String& protocol, - SQL_Driver& driver) { - SYNCHRONIZED; - - driver_cache.put(protocol, &driver); -} - -// connection cache -/// @todo get rid of memory spending Stack [zeros deep inside got accumulated] -SQL_Connection *SQL_Driver_manager::get_connection_from_cache(const String& url) { - SYNCHRONIZED; - - maybe_expire_connection_cache(); - - if(Stack *connections=static_cast(connection_cache.get(url))) - while(connections->top_index()>=0) { // there are cached connections to that 'url' - SQL_Connection *result=static_cast(connections->pop()); - if(result->connected()) // not expired? - return result; - } - - return 0; -} - -void SQL_Driver_manager::put_connection_to_cache(const String& url, - SQL_Connection& connection) { - SYNCHRONIZED; - - Stack *connections=static_cast(connection_cache.get(url)); - if(!connections) { // there are no cached connections to that 'url' yet? - connections=NEW Stack(pool()); // NOTE: never freed up! - connection_cache.put(url, connections); - } - connections->push(&connection); -} - -static void expire_connection(Array::Item *value, void *info) { - SQL_Connection& connection=*static_cast(value); - time_t older_dies=reinterpret_cast(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(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); - - if(prev_expiration_pass_time(now-EXPIRE_UNUSED_CONNECTION_SECONDS)); - - prev_expiration_pass_time=now; - } -} +/** @file + Parser: sql driver manager implementation. + + Copyright (c) 2001-2003 ArtLebedev Group (http://www.artlebedev.com) + Author: Alexandr Petrosian (http://paf.design.ru) +*/ + +static const char * const IDENT_SQL_DRIVER_MANAGER_C="$Date: 2003/12/11 09:22:09 $"; + +#include "pa_sql_driver_manager.h" +#include "ltdl.h" +#include "pa_threads.h" +#include "pa_sql_connection.h" +#include "pa_exception.h" +#include "pa_common.h" +#include "pa_vhash.h" +#include "pa_vtable.h" + +// globals + +SQL_Driver_manager* SQL_driver_manager=0; + +// consts + +const time_t EXPIRE_UNUSED_CONNECTION_SECONDS=60; +const time_t CHECK_EXPIRED_CONNECTIONS_SECONDS=EXPIRE_UNUSED_CONNECTION_SECONDS*2; + +// helpers + +const String& SQL_Driver_services_impl::url_without_login() const { + String& result=*new String; + result << furl->mid(0, furl->pos(':')) << "://****"; + + size_t at_pos=furl->pos('@'); + if(at_pos!=STRING_NOT_FOUND) + result << furl->mid(at_pos, furl->length()); + + return result; +} + +// helpers + +static void expire_connection(SQL_Connection& connection, time_t older_dies) { + if(connection.connected() && connection.expired(older_dies)) + connection.disconnect(); +} +static void expire_connections(SQL_Driver_manager::connection_cache_type::key_type /*key*/, + SQL_Driver_manager::connection_cache_type::value_type stack, + time_t older_dies) { + for(size_t i=0; itop_index(); i++) + expire_connection(*stack->get(i), older_dies); +} + +// SQL_Driver_manager + +SQL_Driver_manager::SQL_Driver_manager(): + is_dlinited(false), prev_expiration_pass_time(0) { +} + +SQL_Driver_manager::~SQL_Driver_manager() { + connection_cache.for_each(expire_connections, time(0)+(time_t)1/*=in future=expire all*/); + + if(is_dlinited) + lt_dlexit(); +} + +/// @param aurl protocol://[driver-dependent] +SQL_Connection* SQL_Driver_manager::get_connection(const String& aurl, + Table *protocol2driver_and_client) { + // we have table for locating protocol's library + if(!protocol2driver_and_client) + throw Exception("parser.runtime", + &aurl, + "$"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); + } + + connection=new SQL_Connection(aurl, *driver); + // associate with pool[request] (deassociates at close) + connection->set_url(); + } + + // 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; +} + +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(driver_cache_type::key_type protocol) { + SYNCHRONIZED; + + return driver_cache.get(protocol); +} + +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 +/// @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; +} + +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); +} + +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; +}