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| version 1.32, 2001/09/05 09:22:45 | version 1.91, 2012/03/16 09:24:14 |
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| 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) 2001-2012 Art. Lebedev Studio (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="$Id$"; | |
| #include "pa_sql_driver_manager.h" | #include "pa_sql_driver_manager.h" |
| #include "ltdl.h" | #include "ltdl.h" |
| #include "pa_threads.h" | |
| #include "pa_sql_connection.h" | #include "pa_sql_connection.h" |
| #include "pa_exception.h" | #include "pa_exception.h" |
| #include "pa_common.h" | #include "pa_common.h" |
| #include "pa_threads.h" | #include "pa_vhash.h" |
| #include "pa_vtable.h" | |
| #include "pa_charsets.h" | |
| #include "pa_sapi.h" | volatile const char * IDENT_PA_SQL_DRIVER_MANAGER_C="$Id$" IDENT_PA_SQL_DRIVER_MANAGER_H IDENT_PA_SQL_CONNECTION_H; |
| // helper macros | |
| #define STRINGIZE(name) #name | |
| // globals | // globals |
| SQL_Driver_manager *SQL_driver_manager; | SQL_Driver_manager* SQL_driver_manager=0; |
| // consts | // consts |
| const int EXPIRE_UNUSED_CONNECTION_SECONDS=60; | const time_t EXPIRE_UNUSED_CONNECTION_SECONDS=60; |
| const int CHECK_EXPIRED_CONNECTIONS_SECONDS=EXPIRE_UNUSED_CONNECTION_SECONDS*2; | const time_t CHECK_EXPIRED_CONNECTIONS_SECONDS=EXPIRE_UNUSED_CONNECTION_SECONDS*2; |
| // helpers | |
| /// SQL_Driver_services Pooled implementation | const String& SQL_Driver_services_impl::url_without_login() const { |
| class SQL_Driver_services_impl : public SQL_Driver_services, public Pooled { | String& result=*new String; |
| public: | result << furl->mid(0, furl->pos(':')) << "://****"; |
| SQL_Driver_services_impl(Pool& apool, const String& aurl) : Pooled(apool), | |
| furl(aurl) { | size_t at_pos=0; |
| } | size_t new_at_pos; |
| while( (new_at_pos=furl->pos('@', at_pos+1))!=STRING_NOT_FOUND) | |
| at_pos=new_at_pos; | |
| if(at_pos) | |
| result << furl->mid(at_pos, furl->length()); | |
| return result; | |
| } | |
| void SQL_Driver_services_impl::transcode(const char* src, size_t src_length, | |
| const char*& dst, size_t& dst_length, | |
| const char* charset_from_name, | |
| const char* charset_to_name | |
| ) | |
| { | |
| try { | |
| // to speed up sql transcode [lots of charsets::get-s -- twice for each cell] | |
| // without complicating sql driver API | |
| // we need to cache couple of name->charset pairs | |
| // assuming pointers to names are are NOT to local vars | |
| struct cache_record { | |
| const char* name; | |
| Charset* object; | |
| } cache[2]={{0,0}, {0,0}}; | |
| Charset* charset_from_object; | |
| Charset* charset_to_object; | |
| if(charset_from_name==cache[0].name) { | |
| charset_from_object=cache[0].object; | |
| } else { | |
| cache[0].name=charset_from_name; | |
| cache[0].object=charset_from_object=&charsets.get(charset_from_name); | |
| } | |
| if(charset_to_name==cache[1].name) { | |
| charset_to_object=cache[1].object; | |
| } else { | |
| cache[1].name=charset_to_name; | |
| cache[1].object=charset_to_object=&charsets.get(charset_to_name); | |
| } | |
| /// allocates some bytes on pool | String::C result=Charset::transcode(String::C(src, src_length), |
| void *malloc(size_t size) { return Pooled::malloc(size); } | *charset_from_object, |
| /// allocates some bytes clearing them with zeros | *charset_to_object); |
| void *calloc(size_t size) { return Pooled::calloc(size); } | dst=result.str; |
| /// throw exception | dst_length=result.length; |
| void _throw(const char *comment) { | } catch(const Exception& e) { |
| THROW(0, 0, | _throw(SQL_Error(e.type(), e.comment())); |
| &furl, | } catch(...) { |
| comment); | _throw(SQL_Error(0, "unknown error while transcoding in sql driver")); |
| } | } |
| } | |
| // helpers | |
| private: | static void expire_connection(SQL_Connection& connection, time_t older_dies) { |
| const String& furl; | 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; i<stack->top_index(); i++) | |
| expire_connection(*stack->get(i), older_dies); | |
| } | |
| // SQL_Driver_manager | // SQL_Driver_manager |
| /// @param request_url protocol://[driver-dependent] | SQL_Driver_manager::SQL_Driver_manager(): |
| SQL_Connection& SQL_Driver_manager::get_connection(const String& request_url, | is_dlinited(false), prev_expiration_pass_time(0) { |
| Table *protocol2driver_and_client) { | } |
| Pool& pool=request_url.pool(); // request pool | |
| SQL_Driver_manager::~SQL_Driver_manager() { | |
| connection_cache.for_each<time_t>(expire_connections, time(0)+(time_t)10/*=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, | |
| const char* arequest_charset, | |
| const char* adocument_root) { | |
| // 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(aurl); |
| if(result && !result->ping()) { // we have some cached connection, is it pingable? | if(connection) { |
| result->disconnect(); // kill unpingabe=dead connection | connection->set_url(); |
| 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 *url_cstr; |
| if(result) | if(connection) |
| request_url_cstr=0; // calm, compiler | 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); | url_cstr=aurl.cstrm(); |
| if(pos<0) | if(!strstr(url_cstr, "://")) |
| PTHROW(0, 0, | throw Exception(PARSER_RUNTIME, |
| &request_url, | aurl.length()?&aurl:0, |
| "no protocol specified"); // NOTE: not THROW, but PTHROW | "connection string must start with protocol://"); |
| // make global_url C-string on global pool | |
| request_url_cstr=request_url.cstr(String::UL_AS_IS); | char *protocol_cstr=lsplit(&url_cstr, ':'); |
| 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 ':' | // skip "//" after ':' |
| while(*request_url_cstr=='/') | while(*url_cstr=='/') |
| request_url_cstr++; | url_cstr++; |
| // make global_protocol C-string on global pool | const String& protocol=*new String(protocol_cstr); |
| 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; | 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(protocol))) { |
| // no cached | // no cached |
| const String *library=0; | const String* library=0; |
| if(protocol2driver_and_client->locate(0, global_protocol)) { | const String* dlopen_file_spec=0; |
| if(!(library=protocol2driver_and_client->item(1)) || library->size()==0) | Table::Action_options options; |
| PTHROW(0, 0, | if(protocol2driver_and_client->locate(0, protocol, options)) { |
| protocol2driver_and_client->origin_string(), | if(!(library=protocol2driver_and_client->item(1)) || library->length()==0) |
| throw Exception(PARSER_RUNTIME, | |
| 0, | |
| "driver library column for protocol '%s' is empty", | "driver library column for protocol '%s' is empty", |
| request_protocol_cstr); | 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, | &aurl, |
| "undefined protocol '%s'", | "undefined protocol '%s'", |
| request_protocol_cstr); | protocol_cstr); |
| if(lt_dlinit()) | if(!is_dlinited) { |
| PTHROW(0, 0, | if(lt_dlinit()) |
| library, | throw Exception(0, |
| "prepare to dynamic loading failed, %s", lt_dlerror()); | library, |
| "prepare to dynamic loading failed, %s", lt_dlerror()); | |
| const char *filename=library->cstr(String::UL_FILE_NAME); | is_dlinited=true; |
| } | |
| const char* filename=library->taint_cstr(String::L_FILE_SPEC); | |
| lt_dlhandle handle=lt_dlopen(filename); | lt_dlhandle handle=lt_dlopen(filename); |
| if (!handle) | if (!handle) { |
| PTHROW(0, 0, | const char* error=lt_dlerror(); |
| throw Exception(0, | |
| library, | library, |
| "can not open the module, %s", lt_dlerror()); | error?error:"can not open the module"); |
| } | |
| 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 201 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->length()? |
| specified_dlopen_file_spec? | dlopen_file_spec->taint_cstrm(String::L_AS_IS):0; |
| dlopen_file_spec->cstr(String::UL_FILE_NAME):0; | if(const char* error=driver->initialize(dlopen_file_spec_cstr)) |
| if(const char *error=driver->initialize( | throw Exception(0, |
| dlopen_file_spec_cstr)) | |
| PTHROW(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 |
| put_driver_to_cache(global_protocol, *driver); | put_driver_to_cache(protocol, driver); |
| } | } |
| // allocate in global pool | connection=new SQL_Connection(aurl, *driver, arequest_charset, adocument_root); |
| // associate with services[request] | // associate with pool[request] (deassociates at close) |
| // NOTE: never freed up! | connection->set_url(); |
| result=new(this->pool()) SQL_Connection(this->pool(), global_url, *driver); | |
| } | } |
| // 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(url_cstr); |
| if(!result->connected()) | // return autoclosing object for it |
| result->connect(request_url_cstr); | return connection; |
| // return it | |
| return *result; | |
| } | } |
| void SQL_Driver_manager::close_connection(const String& url, | void SQL_Driver_manager::close_connection(connection_cache_type::key_type url, |
| SQL_Connection& connection) { | SQL_Connection* connection) { |
| // deassociate from services[request] | |
| connection.set_services(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(driver_cache_type::key_type protocol) { |
| SYNCHRONIZED; | SYNCHRONIZED; |
| return static_cast<SQL_Driver *>(driver_cache.get(protocol)); | return driver_cache.get(protocol); |
| } | } |
| void SQL_Driver_manager::put_driver_to_cache(const String& protocol, | void SQL_Driver_manager::put_driver_to_cache( |
| SQL_Driver& driver) { | driver_cache_type::key_type protocol, |
| driver_cache_type::value_type driver) { | |
| SYNCHRONIZED; | SYNCHRONIZED; |
| driver_cache.put(protocol, &driver); | driver_cache.put(protocol, driver); |
| } | } |
| // 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_Connection* SQL_Driver_manager::get_connection_from_cache(connection_cache_type::key_type url) { |
| SYNCHRONIZED; | SYNCHRONIZED; |
| maybe_expire_connection_cache(); | if(connection_cache_type::value_type connections=connection_cache.get(url)) |
| while(!connections->is_empty()) { // there are cached connections to that 'url' | |
| if(Stack *connections=static_cast<Stack *>(connection_cache.get(url))) | SQL_Connection* result=connections->pop(); |
| while(connections->top_index()>=0) { // there are cached connections to that 'url' | |
| SQL_Connection *result=static_cast<SQL_Connection *>(connections->pop()); | |
| if(result->connected()) // not expired? | if(result->connected()) // not expired? |
| return result; | return result; |
| } | } |
| Line 221 SQL_Connection *SQL_Driver_manager::get_ | Line 270 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( |
| SQL_Connection& connection) { | connection_cache_type::key_type url, |
| SQL_Connection* connection) { | |
| SYNCHRONIZED; | SYNCHRONIZED; |
| Stack *connections=static_cast<Stack *>(connection_cache.get(url)); | connection_cache_type::value_type connections=connection_cache.get(url); |
| if(!connections) { // there are no cached connections to that 'url' yet? | if(!connections) { // there are no cached connections to that 'url' yet? |
| connections=NEW Stack(pool()); // NOTE: never freed up! | connections=new connection_cache_element_base_type; |
| connection_cache.put(url, connections); | connection_cache.put(url, connections); |
| } | } |
| 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) { |
| connection_cache.for_each(expire_connections, | connection_cache.for_each<time_t>(expire_connections, time_t(now-EXPIRE_UNUSED_CONNECTION_SECONDS)); |
| reinterpret_cast<void *>(now-EXPIRE_UNUSED_CONNECTION_SECONDS)); | |
| prev_expiration_pass_time=now; | prev_expiration_pass_time=now; |
| } | } |
| } | } |
| static void add_connection_to_status_cache_table(SQL_Connection& connection, Table* table) { | |
| if(connection.connected()) { | |
| ArrayString& row=*new ArrayString; | |
| // url | |
| row+=&connection.services().url_without_login(); | |
| // time | |
| time_t time_used=connection.get_time_used(); | |
| row+=new String(pa_strdup(ctime(&time_used))); | |
| *table+=&row; | |
| } | |
| } | |
| static void add_connections_to_status_cache_table( | |
| SQL_Driver_manager::connection_cache_type::key_type /*key*/, | |
| SQL_Driver_manager::connection_cache_type::value_type stack, Table* table) | |
| { | |
| for(Array_iterator<SQL_Connection*> 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<Table*>(add_connections_to_status_cache_table, &table); | |
| result->get_hash()->put(*new String("cache"), new VTable(&table)); | |
| } | |
| return result; | |
| } |