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| version 1.69.2.2, 2003/01/27 16:19:11 | version 1.100, 2020/12/11 11:31:22 |
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| Line 1 | Line 1 |
| /** @file | /** @file |
| Parser: sql driver manager implementation. | Parser: sql driver manager implementation. |
| Copyright (c) 2001, 2003 ArtLebedev Group (http://www.artlebedev.com) | Copyright (c) 2001-2017 Art. Lebedev Studio (http://www.artlebedev.com) |
| Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru) | Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru) |
| */ | */ |
| 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" |
| #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_vhash.h" |
| #include "pa_vtable.h" | #include "pa_vtable.h" |
| #include "pa_charsets.h" | |
| volatile const char * IDENT_PA_SQL_DRIVER_MANAGER_C="$Id$" IDENT_PA_SQL_DRIVER_MANAGER_H IDENT_PA_SQL_CONNECTION_H; | |
| // 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=10; |
| const int CHECK_EXPIRED_CONNECTIONS_SECONDS=EXPIRE_UNUSED_CONNECTION_SECONDS*2; | const time_t CHECK_EXPIRED_CONNECTIONS_SECONDS=EXPIRE_UNUSED_CONNECTION_SECONDS*2; |
| // helpers | // helpers |
| ConstStringPtr url_without_login(Pool& pool, ConstStringPtr url) { | const String& SQL_Driver_services_impl::url_without_login() const { |
| String& result=*new(pool) String(pool); | String& result=*new String; |
| result << url.mid(0, url.pos(":")) << "://****"; | result << furl->mid(0, furl->pos(':')) << "://****"; |
| int at_pos=url.pos("@"); | size_t at_pos=0; |
| if(at_pos>0) | size_t new_at_pos; |
| result << url.mid(at_pos, url.size()); | 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; | return result; |
| } | } |
| /// SQL_Driver_services Pooled implementation | void SQL_Driver_services_impl::transcode(const char* src, size_t src_length, |
| class SQL_Driver_services_impl : public SQL_Driver_services, public Pooled { | const char*& dst, size_t& dst_length, |
| public: | const char* charset_from_name, |
| SQL_Driver_services_impl(Pool& apool, ConstStringPtr aurl) : Pooled(apool), | const char* charset_to_name |
| furl(aurl) { | ) |
| } | { |
| try { | |
| virtual void *malloc(size_t size) { return Pooled::malloc(size, 8); } | // to speed up sql transcode [lots of charsets::get-s -- twice for each cell] |
| virtual void *calloc(size_t size) { return Pooled::calloc(size); } | // 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=&pa_charsets.get_direct(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=&pa_charsets.get_direct(charset_to_name); | |
| } | |
| /** | String::C result=Charset::transcode(String::C(src, src_length), *charset_from_object, *charset_to_object); |
| normally we can't 'throw' from dynamic library, so | dst=result.str; |
| the idea is to #1 jump to C++ some function to main body, where | dst_length=result.length; |
| every function stack frame has exception unwind information | } catch(const Exception& e) { |
| and from there... #2 propagate_exception() | _throw(SQL_Error(e.type(), e.comment())); |
| } catch(...) { | |
| but when parser configured --with-sjlj-exceptions | _throw(SQL_Error("unknown error while transcoding in sql driver")); |
| one can simply 'throw' from dynamic library. | |
| [sad story: one can not longjump/throw due to some bug in gcc as of 3.2.1 version] | |
| */ | |
| virtual void _throw(const SQL_Error& aexception) { | |
| // converting SQL_exception to parser Exception | |
| // hiding passwords and addresses from accidental show [imagine user forgot @exception] | |
| #ifdef PA_WITH_SJLJ_EXCEPTIONS | |
| throw | |
| #else | |
| fexception= | |
| #endif | |
| Exception(aexception.type(), | |
| aexception.problem_source()?static_cast<const String*>(aexception.problem_source()) | |
| :&url_without_login(pool(), furl), | |
| aexception.comment()); | |
| #ifndef PA_WITH_SJLJ_EXCEPTIONS | |
| longjmp(mark, 1); | |
| #endif | |
| } | |
| virtual void propagate_exception() { | |
| #ifndef PA_WITH_SJLJ_EXCEPTIONS | |
| throw fexception; | |
| #endif | |
| } | } |
| } | |
| private: | |
| ConstStringPtr furl; | |
| Exception fexception; | |
| }; | |
| // helpers | // helpers |
| static void expire_connection(Array::Item *value, void *info) { | static void expire_connection(SQL_Connection& connection, time_t older_dies) { |
| SQL_Connection& connection=*static_cast<SQL_Connection *>(value); | |
| time_t older_dies=reinterpret_cast<time_t>(info); | |
| if(connection.connected() && connection.expired(older_dies)) | if(connection.connected() && connection.expired(older_dies)) |
| connection.disconnect(); | connection.disconnect(); |
| } | } |
| static void expire_connections(const Hash::Key& key, Hash::Val *value, void *info) { | 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) { |
| Stack& stack=*static_cast<Stack *>(value); | for(size_t i=0; i<stack->top_index(); i++) |
| for(int i=0; i<=stack.top_index(); i++) | expire_connection(*stack->get(i), older_dies); |
| expire_connection(stack.get(i), info); | |
| } | } |
| // SQL_Driver_manager | // SQL_Driver_manager |
| SQL_Driver_manager::SQL_Driver_manager(): | SQL_Driver_manager::SQL_Driver_manager(): prev_expiration_pass_time(0) {} |
| prev_expiration_pass_time(0) { | |
| } | |
| SQL_Driver_manager::~SQL_Driver_manager() { | SQL_Driver_manager::~SQL_Driver_manager() { |
| connection_cache.for_each(expire_connections, | connection_cache.for_each<time_t>(expire_connections, time(0)+(time_t)10/*=in future=expire all*/); |
| reinterpret_cast<void *>(time(0)+1/*=in future=expire all*/)); | |
| } | } |
| /// @param request_url protocol://[driver-dependent] | /// @param aurl protocol://[driver-dependent] |
| SQL_ConnectionPtr SQL_Driver_manager::get_connection(ConstStringPtr request_url, | SQL_Connection* SQL_Driver_manager::get_connection(const String& aurl, Table *protocol2driver_and_client, const char* arequest_charset, const char* adocument_root) { |
| ConstStringPtr request_origin, | |
| Table *protocol2driver_and_client) { | |
| Pool& pool=request_origin.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) |
| throw Exception("parser.runtime", | throw Exception(PARSER_RUNTIME, &aurl, "$" MAIN_SQL_NAME ":" MAIN_SQL_DRIVERS_NAME " table must be defined"); |
| &request_url, | |
| "$"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 *connection=get_connection_from_cache(request_url); | SQL_Connection* connection=get_connection_from_cache(aurl); |
| if(connection) { | if(connection) { |
| connection->set_services(services); | connection->set_url(); |
| if(!connection->ping()) { // we have some cached connection, is it pingable? | if(!connection->ping()) { // we have some cached connection, is it pingable? |
| connection->disconnect(); // kill unpingabe=dead connection | connection->disconnect(); // kill unpingabe=dead connection |
| connection=0; | connection=0; |
| } | } |
| } | } |
| char *request_url_cstr; | char *url_cstr; |
| if(connection) | 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, "://")) |
| throw Exception("parser.runtime", | throw Exception(PARSER_RUNTIME, aurl.length()?&aurl:0, "connection string must start with protocol://"); |
| request_url.size()?&request_url:&request_origin, | |
| "connection string must start with protocol://"); | |
| char *protocol_cstr=lsplit(&url_cstr, ':'); | |
| // make global_url C-string on global pool | |
| request_url_cstr=request_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; |
| // 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; |
| const String *dlopen_file_spec=0; | const String* dlopen_file_spec=0; |
| if(protocol2driver_and_client->locate(0, global_protocol)) { | Table::Action_options options; |
| if(!(library=protocol2driver_and_client->item(1)) || library->size()==0) | if(protocol2driver_and_client->locate(0, protocol, options)) { |
| throw Exception("parser.runtime", | if(!(library=protocol2driver_and_client->item(1)) || library->length()==0) |
| protocol2driver_and_client->origin_string(), | throw Exception(PARSER_RUNTIME, 0, "driver library column for protocol '%s' is empty", protocol_cstr); |
| "driver library column for protocol '%s' is empty", | |
| request_protocol_cstr); | |
| dlopen_file_spec=protocol2driver_and_client->item(2); | dlopen_file_spec=protocol2driver_and_client->item(2); |
| } else | } else |
| throw Exception("parser.runtime", | throw Exception(PARSER_RUNTIME, &aurl, "undefined protocol '%s'", protocol_cstr); |
| &request_url, | |
| "undefined protocol '%s'", | |
| request_protocol_cstr); | |
| if(lt_dlinit()) | |
| throw Exception(0, | |
| library, | |
| "prepare to dynamic loading failed, %s", lt_dlerror()); | |
| const char *filename=library->cstr(String::UL_FILE_SPEC); | pa_dlinit(); |
| 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) { |
| throw Exception(0, | const char* error=lt_dlerror(); |
| library, | throw Exception(0, library, error ? error : "can not open the module"); |
| "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) |
| throw Exception(0, | throw Exception(0, library, "function '" SQL_DRIVER_CREATE_NAME "' was not found"); |
| library, | |
| "function '"SQL_DRIVER_CREATE_NAME"' was not found"); | |
| // create library-driver! | // create library-driver! |
| driver=(*create)(); | driver=(*create)(); |
| Line 209 SQL_ConnectionPtr SQL_Driver_manager::ge | Line 168 SQL_ConnectionPtr SQL_Driver_manager::ge |
| // 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) |
| throw Exception(0, | throw Exception(0, library, "driver implements API version 0x%04X not equal to 0x%04X", driver_api_version, SQL_DRIVER_API_VERSION); |
| 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 | // initialise by connecting to sql client dynamic link library |
| char *dlopen_file_spec_cstr= | char* dlopen_file_spec_cstr= |
| dlopen_file_spec && dlopen_file_spec->size()? | dlopen_file_spec && dlopen_file_spec->length()? |
| dlopen_file_spec->cstr(String::UL_AS_IS):0; | dlopen_file_spec->taint_cstrm(String::L_AS_IS):0; |
| if(const char *error=driver->initialize( | if(const char* error=driver->initialize(dlopen_file_spec_cstr)) |
| 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); |
| throw Exception(0, | |
| library, | |
| "driver failed to initialize client library '%s', %s", | |
| dlopen_file_spec_cstr?dlopen_file_spec_cstr:"unspecifed", | |
| 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(); |
| connection=new(this->pool()) SQL_Connection(this->pool(), global_url, *driver); | |
| // associate with services[request] (deassociates at close) | |
| connection->set_services(services); | |
| } | } |
| // if not connected yet, do that now, when connection has services | // if not connected yet, do that now, when connection has services |
| if(!connection->connected()) | if(!connection->connected()) |
| connection->connect(request_url_cstr); | connection->connect(url_cstr); |
| // return autoclosing object for it | // return autoclosing object for it |
| return SQL_ConnectionPtr(connection); | return connection; |
| } | } |
| void SQL_Driver_manager::close_connection(ConstStringPtr 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(ConstStringPtr 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(ConstStringPtr protocol, | void SQL_Driver_manager::put_driver_to_cache(driver_cache_type::key_type protocol, driver_cache_type::value_type driver) { |
| SQL_Driver& 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(ConstStringPtr url) { | SQL_Connection* SQL_Driver_manager::get_connection_from_cache(connection_cache_type::key_type url) { |
| SYNCHRONIZED; | SYNCHRONIZED; |
| if(Stack *connections=static_cast<Stack *>(connection_cache.get(url))) | if(connection_cache_type::value_type connections=connection_cache.get(url)) |
| while(connections->top_index()>=0) { // there are cached connections to that 'url' | while(!connections->is_empty()) { // there are cached connections to that 'url' |
| SQL_Connection *result=static_cast<SQL_Connection *>(connections->pop()); | SQL_Connection* result=connections->pop(); |
| if(result->connected()) // not expired? | if(result->connected()) // not expired? |
| return result; | return result; |
| } | } |
| Line 283 SQL_Connection *SQL_Driver_manager::get_ | Line 227 SQL_Connection *SQL_Driver_manager::get_ |
| return 0; | return 0; |
| } | } |
| void SQL_Driver_manager::put_connection_to_cache(ConstStringPtr url, | void SQL_Driver_manager::put_connection_to_cache(connection_cache_type::key_type url, SQL_Connection* connection) { |
| 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); |
| } | } |
| void SQL_Driver_manager::maybe_expire_cache() { | void SQL_Driver_manager::maybe_expire_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(Array::Item *value, void *info) { | static void add_connection_to_status_cache_table(SQL_Connection& connection, Table* table) { |
| SQL_Connection& connection=*static_cast<SQL_Connection *>(value); | |
| Table& table=*static_cast<Table *>(info); | |
| if(connection.connected()) { | if(connection.connected()) { |
| Pool& pool=table.pool(); | ArrayString& row=*new ArrayString; |
| Array& row=*new(pool) Array(pool); | |
| // url | // url |
| row+=&url_without_login(pool, connection.get_url()); | row+=&connection.services().url_without_login(); |
| // time | // time |
| time_t time_used=connection.get_time_used(); | time_t time_used=connection.get_time_used(); |
| const char *unsafe_time_cstr=ctime(&time_used); | row+=new String(pa_strdup(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; | *table+=&row; |
| } | } |
| } | } |
| static void add_connections_to_status_cache_table(const Hash::Key& key, Hash::Val *value, void *info) { | 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) { |
| Stack& stack=*static_cast<Stack *>(value); | for(Array_iterator<SQL_Connection*> i(*stack); i.has_next(); ) |
| Array_iter iter(stack); | add_connection_to_status_cache_table(*i.next(), table); |
| 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); | Value* SQL_Driver_manager::get_status() { |
| Value* result=new VHash; | |
| // cache | // cache |
| { | { |
| Array& columns=*new(pool) Array(pool); | ArrayString& columns=*new ArrayString; |
| columns+=new(pool) String(pool, "url"); | columns+=new String("url"); |
| columns+=new(pool) String(pool, "time"); | columns+=new String("time"); |
| Table& table=*new(pool) Table(pool, 0, &columns, connection_cache.size()); | Table& table=*new Table(&columns, connection_cache.count()); |
| connection_cache.for_each(add_connections_to_status_cache_table, &table); | connection_cache.for_each<Table*>(add_connections_to_status_cache_table, &table); |
| result.hash(source).put(*new(pool) String(pool, "cache"), new(pool) VTable(pool, &table)); | result->get_hash()->put(*new String("cache"), new VTable(&table)); |
| } | } |
| return result; | return result; |