Annotation of parser3/src/main/pa_sql_driver_manager.C, revision 1.69.2.17.2.7
1.54 paf 1: /** @file
2: Parser: sql driver manager implementation.
3:
1.69.2.9 paf 4: Copyright (c) 2001-2003 ArtLebedev Group (http://www.artlebedev.com)
1.61 paf 5: Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
1.63 paf 6: */
1.54 paf 7:
1.69.2.17.2.7! (paf 8:: static const char* IDENT_SQL_DRIVER_MANAGER_C="$Date: 2003/03/24 13:16:12 $";
1.54 paf 9:
10: #include "pa_sql_driver_manager.h"
11: #include "ltdl.h"
1.69.2.7 paf 12: #include "pa_threads.h"
1.54 paf 13: #include "pa_sql_connection.h"
14: #include "pa_exception.h"
15: #include "pa_common.h"
16: #include "pa_vhash.h"
17: #include "pa_vtable.h"
18:
19: // globals
20:
1.69.2.1 paf 21: SQL_Driver_manager SQL_driver_manager;
1.54 paf 22:
23: // consts
24:
1.69.2.4 paf 25: const time_t EXPIRE_UNUSED_CONNECTION_SECONDS=60;
26: const time_t CHECK_EXPIRED_CONNECTIONS_SECONDS=EXPIRE_UNUSED_CONNECTION_SECONDS*2;
1.54 paf 27:
28: // helpers
29:
1.69.2.17.2.1 (paf 30:: const String& SQL_Driver_services_impl::url_without_login() const {
1.69.2.17.2.5 (paf 31:: String& result=*new String;
32:: result << furl->mid(0, furl->pos(":")) << "://****";
1.54 paf 33:
1.69.2.17.2.7! (paf 34:: size_t at_pos=furl->pos("@");
! 35:: if(at_pos!=STRING_NOT_FOUND)
1.69.2.17.2.5 (paf 36:: result << furl->mid(at_pos, furl->length());
1.54 paf 37:
38: return result;
39: }
40:
41: // helpers
42:
1.69.2.3 paf 43: static void expire_connection(SQL_Connection& connection, time_t older_dies) {
1.54 paf 44: if(connection.connected() && connection.expired(older_dies))
45: connection.disconnect();
46: }
1.69.2.3 paf 47: static void expire_connections(
48: SQL_Driver_manager::connection_cache_type::key_type /*key*/,
49: SQL_Driver_manager::connection_cache_type::value_type stack,
50: time_t older_dies) {
51: for(int i=0; i<=stack->top_index(); i++)
52: expire_connection(*stack->get(i), older_dies);
1.54 paf 53: }
54:
55: // SQL_Driver_manager
56:
1.69.2.1 paf 57: SQL_Driver_manager::SQL_Driver_manager():
1.69.2.17 paf 58: prev_expiration_pass_time(0), is_dlinited(false) {
1.69.2.6 paf 59:
1.69.2.17.2.6 (paf 60:: cache_managers.put(StringBody("sql"), this);
1.54 paf 61: }
62:
63: SQL_Driver_manager::~SQL_Driver_manager() {
1.69.2.3 paf 64: connection_cache.for_each(expire_connections, time(0)+(time_t)1/*=in future=expire all*/);
1.69.2.17 paf 65:
66: if(is_dlinited)
67: lt_dlexit();
1.54 paf 68: }
69:
1.69.2.4 paf 70: /// @param aurl protocol://[driver-dependent]
1.69.2.17.2.5 (paf 71:: SQL_Connection* SQL_Driver_manager::get_connection(const String& aurl,
72:: Table *protocol2driver_and_client) {
1.54 paf 73: // we have table for locating protocol's library
74: if(!protocol2driver_and_client)
1.62 paf 75: throw Exception("parser.runtime",
1.69.2.17.2.5 (paf 76:: &aurl,
1.54 paf 77: "$"MAIN_SQL_NAME":"MAIN_SQL_DRIVERS_NAME" table must be defined");
78:
79: // first trying to get cached connection
1.69.2.17.2.5 (paf 80:: SQL_Connection* connection=get_connection_from_cache(aurl);
1.58 paf 81: if(connection) {
1.69.2.17.2.5 (paf 82:: connection->set_url();
1.58 paf 83: if(!connection->ping()) { // we have some cached connection, is it pingable?
84: connection->disconnect(); // kill unpingabe=dead connection
1.69.2.17.2.5 (paf 85:: connection=0;
1.54 paf 86: }
87: }
88:
1.69.2.17.2.5 (paf 89:: char *url_cstr;
1.58 paf 90: if(connection)
1.69.2.17.2.5 (paf 91:: url_cstr=0; // calm, compiler
1.54 paf 92: else { // no cached connection or it were unpingabe: connect/reconnect
1.69.2.17.2.7! (paf 93:: if(aurl.pos("://")==STRING_NOT_FOUND)
1.62 paf 94: throw Exception("parser.runtime",
1.69.2.17.2.5 (paf 95:: aurl.length()?&aurl:0,
1.62 paf 96: "connection string must start with protocol://");
1.54 paf 97:
1.69.2.17.2.5 (paf 98:: char *protocol_cstr=lsplit(&url_cstr, ':');
1.54 paf 99: // skip "//" after ':'
1.69.2.17.2.5 (paf 100:: while(*url_cstr=='/')
101:: url_cstr++;
102:: const String& protocol=*new String(protocol_cstr);
1.54 paf 103:
104: SQL_Driver *driver;
105: // first trying to get cached driver
1.69.2.17.2.5 (paf 106:: if(!(driver=get_driver_from_cache(protocol))) {
1.54 paf 107: // no cached
1.69.2.17.2.5 (paf 108:: const String* library=0;
109:: const String* dlopen_file_spec=0;
110:: if(protocol2driver_and_client->locate(0, protocol)) {
1.69.2.17.2.3 (paf 111:: if(!(library=protocol2driver_and_client->item(1)) || library->length()==0)
1.62 paf 112: throw Exception("parser.runtime",
1.69.2.17.2.5 (paf 113:: 0,
1.54 paf 114: "driver library column for protocol '%s' is empty",
1.69.2.17.2.5 (paf 115:: protocol_cstr);
1.54 paf 116: dlopen_file_spec=protocol2driver_and_client->item(2);
117: } else
1.62 paf 118: throw Exception("parser.runtime",
1.69.2.17.2.5 (paf 119:: &aurl,
1.54 paf 120: "undefined protocol '%s'",
1.69.2.17.2.5 (paf 121:: protocol_cstr);
1.54 paf 122:
1.69.2.17 paf 123: if(!is_dlinited) {
124: if(lt_dlinit())
125: throw Exception(0,
126: library,
127: "prepare to dynamic loading failed, %s", lt_dlerror());
128:
129: is_dlinited=true;
130: }
1.54 paf 131:
1.69.2.17.2.4 (paf 132:: const char* filename=library->cstr(String::L_FILE_SPEC);
1.54 paf 133: lt_dlhandle handle=lt_dlopen(filename);
134: if (!handle)
1.62 paf 135: throw Exception(0,
1.54 paf 136: library,
137: "can not open the module, %s", lt_dlerror());
138:
139: SQL_Driver_create_func create=(SQL_Driver_create_func)lt_dlsym(handle,
140: SQL_DRIVER_CREATE_NAME);
141: if(!create)
1.62 paf 142: throw Exception(0,
1.54 paf 143: library,
144: "function '"SQL_DRIVER_CREATE_NAME"' was not found");
145:
146: // create library-driver!
147: driver=(*create)();
148:
149: // validate driver api version
150: int driver_api_version=driver->api_version();
151: if(driver_api_version!=SQL_DRIVER_API_VERSION)
1.62 paf 152: throw Exception(0,
1.54 paf 153: library,
154: "driver implements API version 0x%04X not equal to 0x%04X",
155: driver_api_version, SQL_DRIVER_API_VERSION);
156:
157: // initialise by connecting to sql client dynamic link library
1.69.2.17.2.5 (paf 158:: char* dlopen_file_spec_cstr=
1.69.2.17.2.3 (paf 159:: dlopen_file_spec && dlopen_file_spec->length()?
1.69.2.17.2.5 (paf 160:: dlopen_file_spec->cstrm(String::L_AS_IS):0;
161:: if(const char* error=driver->initialize(dlopen_file_spec_cstr))
1.62 paf 162: throw Exception(0,
1.54 paf 163: library,
164: "driver failed to initialize client library '%s', %s",
1.69.2.17.2.5 (paf 165:: dlopen_file_spec_cstr?dlopen_file_spec_cstr:"unspecifed",
1.54 paf 166: error);
167:
168: // cache it
1.69.2.17.2.5 (paf 169:: put_driver_to_cache(protocol, driver);
1.54 paf 170: }
171:
1.69.2.17.2.5 (paf 172:: connection=new SQL_Connection(aurl, *driver);
1.69.2.4 paf 173: // associate with pool[request] (deassociates at close)
1.69.2.17.2.5 (paf 174:: connection->set_url();
1.54 paf 175: }
176:
1.58 paf 177: // if not connected yet, do that now, when connection has services
178: if(!connection->connected())
1.69.2.17.2.5 (paf 179:: connection->connect(url_cstr);
1.58 paf 180: // return autoclosing object for it
1.69.2.17.2.5 (paf 181:: return connection;
1.54 paf 182: }
183:
1.69.2.4 paf 184: void SQL_Driver_manager::close_connection(connection_cache_type::key_type url,
1.69.2.17.2.5 (paf 185:: SQL_Connection* connection) {
1.54 paf 186: put_connection_to_cache(url, connection);
187: }
188:
189:
190: // driver cache
191:
1.69.2.4 paf 192: SQL_Driver *SQL_Driver_manager::get_driver_from_cache(driver_cache_type::key_type protocol) {
1.54 paf 193: SYNCHRONIZED;
194:
1.69.2.4 paf 195: return driver_cache.get(protocol);
1.54 paf 196: }
197:
1.69.2.4 paf 198: void SQL_Driver_manager::put_driver_to_cache(
199: driver_cache_type::key_type protocol,
200: driver_cache_type::value_type driver) {
1.54 paf 201: SYNCHRONIZED;
202:
1.69.2.4 paf 203: driver_cache.put(protocol, driver);
1.54 paf 204: }
205:
206: // connection cache
1.69.2.15 paf 207: /// @todo get rid of memory spending Stack [zeros deep inside got accumulated]
1.69.2.17.2.5 (paf 208:: SQL_Connection* SQL_Driver_manager::get_connection_from_cache(
1.69.2.4 paf 209: connection_cache_type::key_type url) {
1.54 paf 210: SYNCHRONIZED;
211:
1.69.2.4 paf 212: if(connection_cache_type::value_type connections=connection_cache.get(url))
1.54 paf 213: while(connections->top_index()>=0) { // there are cached connections to that 'url'
1.69.2.17.2.5 (paf 214:: SQL_Connection* result=connections->pop();
1.54 paf 215: if(result->connected()) // not expired?
216: return result;
217: }
218:
1.69.2.17.2.5 (paf 219:: return 0;
1.54 paf 220: }
221:
1.69.2.4 paf 222: void SQL_Driver_manager::put_connection_to_cache(
1.69.2.17.2.5 (paf 223:: connection_cache_type::key_type url,
224:: SQL_Connection* connection) {
1.54 paf 225: SYNCHRONIZED;
226:
1.69.2.4 paf 227: connection_cache_type::value_type connections=connection_cache.get(url);
1.54 paf 228: if(!connections) { // there are no cached connections to that 'url' yet?
1.69.2.17.2.5 (paf 229:: connections=new connection_cache_element_base_type;
1.54 paf 230: connection_cache.put(url, connections);
231: }
1.69.2.4 paf 232: connections->push(connection);
1.54 paf 233: }
234:
235: void SQL_Driver_manager::maybe_expire_cache() {
236: time_t now=time(0);
237:
238: if(prev_expiration_pass_time<now-CHECK_EXPIRED_CONNECTIONS_SECONDS) {
1.69.2.4 paf 239: connection_cache.for_each(expire_connections, time_t(now-EXPIRE_UNUSED_CONNECTION_SECONDS));
1.54 paf 240:
241: prev_expiration_pass_time=now;
242: }
243: }
1.69.2.4 paf 244: /*
1.54 paf 245: static void add_connection_to_status_cache_table(Array::Item *value, void *info) {
1.69.2.17.2.4 (paf 246:: SQL_Connection& connection=*static_cast<SQL_Connection* >(value);
1.54 paf 247: Table& table=*static_cast<Table *>(info);
248:
249: if(connection.connected()) {
1.69.2.17.2.1 (paf 250:: =table.pool();
251:: Array& row=*new Array();
1.54 paf 252:
253: // url
1.69.2.17.2.2 (paf 254:: row+=&url_without_login(connection.get_url());
1.54 paf 255: // time
1.58 paf 256: time_t time_used=connection.get_time_used();
1.69.2.9 paf 257: const char* unsafe_time_cstr=ctime(&time_used);
1.54 paf 258: int time_buf_size=strlen(unsafe_time_cstr);
1.69.2.13 paf 259: char *safe_time_buf=pool.copy(unsafe_time_cstr, time_buf_size);
1.69.2.17.2.2 (paf 260:: row+=new String(safe_time_buf, time_buf_size);
1.54 paf 261:
262: table+=&row;
263: }
264: }
265: static void add_connections_to_status_cache_table(const Hash::Key& key, Hash::Val *value, void *info) {
266: Stack& stack=*static_cast<Stack *>(value);
267: Array_iter iter(stack);
268: for(int countdown=stack.top_index(); countdown-->=0; )
269: add_connection_to_status_cache_table(iter.next(), info);
1.69.2.4 paf 270: }*/
271: /// @todo convert to object_ptr
1.69.2.17.2.5 (paf 272:: Value* SQL_Driver_manager::get_status() {
273:: Value* result=new VHash;
1.69.2.4 paf 274: /*
1.54 paf 275: // cache
276: {
1.69.2.17.2.1 (paf 277:: Array& columns=*new Array();
1.69.2.17.2.2 (paf 278:: columns+=new String("url");
279:: columns+=new String("time");
1.69.2.17.2.3 (paf 280:: Table& table=*new Table(0, &columns, connection_cache.length());
1.54 paf 281:
282: connection_cache.for_each(add_connections_to_status_cache_table, &table);
283:
1.69.2.17.2.2 (paf 284:: result.hash(source).put(*new String("cache"), new VTable(&table));
1.69.2.4 paf 285: }*/
1.54 paf 286:
287: return result;
1.57 paf 288: }
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