Annotation of parser3/src/main/pa_sql_driver_manager.C, revision 1.69.2.17.2.1
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:
1.69.2.17.2.1! (paf 8:: static const char* IDENT_SQL_DRIVER_MANAGER_C="$Date: 2003/03/13 12:34:21 $";
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 {
! 31:: const String& result(new String);
1.69.2.4 paf 32: *result << furl->mid(0, furl->pos(":")) << "://****";
1.54 paf 33:
1.69.2.4 paf 34: int at_pos=furl->pos("@");
1.54 paf 35: if(at_pos>0)
1.69.2.4 paf 36: *result << furl->mid(at_pos, furl->size());
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:
1.69.2.17.2.1! (paf 60:: cache_managers.put(String* (new String("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]
1.69.2.17.2.1! (paf 71:: SQL_ConnectionPtr SQL_Driver_manager::get_connection(const String& arequest_url,
! 72:: const String& aorigin,
1.54 paf 73: Table *protocol2driver_and_client) {
74: // we have table for locating protocol's library
75: if(!protocol2driver_and_client)
1.62 paf 76: throw Exception("parser.runtime",
1.69.2.4 paf 77: arequest_url,
1.54 paf 78: "$"MAIN_SQL_NAME":"MAIN_SQL_DRIVERS_NAME" table must be defined");
79:
80: // first trying to get cached connection
1.69.2.4 paf 81: SQL_ConnectionPtr connection=get_connection_from_cache(arequest_url);
1.58 paf 82: if(connection) {
1.69.2.4 paf 83: connection->set_pool(&apool);
1.58 paf 84: if(!connection->ping()) { // we have some cached connection, is it pingable?
85: connection->disconnect(); // kill unpingabe=dead connection
1.69.2.4 paf 86: connection=SQL_ConnectionPtr(0);
1.54 paf 87: }
88: }
89:
1.69.2.17.2.1! (paf 90:: const char* request_url_cstr_ptr;
1.54 paf 91: char *request_url_cstr;
1.58 paf 92: if(connection)
1.54 paf 93: request_url_cstr=0; // calm, compiler
94: else { // no cached connection or it were unpingabe: connect/reconnect
1.69.2.4 paf 95: if(arequest_url->pos("://")<0)
1.62 paf 96: throw Exception("parser.runtime",
1.69.2.4 paf 97: arequest_url->size()?arequest_url:aorigin,
1.62 paf 98: "connection string must start with protocol://");
1.54 paf 99:
1.69.2.5 paf 100: // make global_url C-string on driver_cache_pool pool
1.69.2.17.2.1! (paf 101:: const String& global_url(new String(arequest_url->cstr(driver_cache_pool)));
1.54 paf 102:
1.69.2.16 paf 103: request_url_cstr=request_url_cstr_ptr=arequest_url->cstr();
1.54 paf 104: char *request_protocol_cstr=lsplit(&request_url_cstr, ':');
105: // skip "//" after ':'
106: while(*request_url_cstr=='/')
107: request_url_cstr++;
1.69.2.5 paf 108: // make global_protocol C-string on driver_cache_pool pool
1.69.2.17.2.1! (paf 109:: const String& global_protocol(new String(driver_cache_pool.copy(request_protocol_cstr)));
1.54 paf 110:
111: SQL_Driver *driver;
112: // first trying to get cached driver
113: if(!(driver=get_driver_from_cache(global_protocol))) {
114: // no cached
1.69.2.17.2.1! (paf 115:: const String& library(0);
! 116:: const String& dlopen_file_spec(0);
1.54 paf 117: if(protocol2driver_and_client->locate(0, global_protocol)) {
118: if(!(library=protocol2driver_and_client->item(1)) || library->size()==0)
1.62 paf 119: throw Exception("parser.runtime",
1.54 paf 120: protocol2driver_and_client->origin_string(),
121: "driver library column for protocol '%s' is empty",
122: request_protocol_cstr);
123: dlopen_file_spec=protocol2driver_and_client->item(2);
124: } else
1.62 paf 125: throw Exception("parser.runtime",
1.69.2.4 paf 126: arequest_url,
1.54 paf 127: "undefined protocol '%s'",
128: request_protocol_cstr);
129:
1.69.2.17 paf 130: if(!is_dlinited) {
131: if(lt_dlinit())
132: throw Exception(0,
133: library,
134: "prepare to dynamic loading failed, %s", lt_dlerror());
135:
136: is_dlinited=true;
137: }
1.54 paf 138:
1.69.2.17.2.1! (paf 139:: const char* filename=library->cstr(String::UL_FILE_SPEC);
1.54 paf 140: lt_dlhandle handle=lt_dlopen(filename);
141: if (!handle)
1.62 paf 142: throw Exception(0,
1.54 paf 143: library,
144: "can not open the module, %s", lt_dlerror());
145:
146: SQL_Driver_create_func create=(SQL_Driver_create_func)lt_dlsym(handle,
147: SQL_DRIVER_CREATE_NAME);
148: if(!create)
1.62 paf 149: throw Exception(0,
1.54 paf 150: library,
151: "function '"SQL_DRIVER_CREATE_NAME"' was not found");
152:
153: // create library-driver!
154: driver=(*create)();
155:
156: // validate driver api version
157: int driver_api_version=driver->api_version();
158: if(driver_api_version!=SQL_DRIVER_API_VERSION)
1.62 paf 159: throw Exception(0,
1.54 paf 160: library,
161: "driver implements API version 0x%04X not equal to 0x%04X",
162: driver_api_version, SQL_DRIVER_API_VERSION);
163:
164: // initialise by connecting to sql client dynamic link library
1.69.2.17.2.1! (paf 165:: const char* dlopen_file_spec_cstr=
1.54 paf 166: dlopen_file_spec && dlopen_file_spec->size()?
1.69.2.12 paf 167: dlopen_file_spec->cstr(String::UL_AS_IS):CharPtr(0);
1.69.2.9 paf 168: if(const char* error=driver->initialize(
1.54 paf 169: dlopen_file_spec_cstr))
1.62 paf 170: throw Exception(0,
1.54 paf 171: library,
172: "driver failed to initialize client library '%s', %s",
1.69.2.10 paf 173: dlopen_file_spec_cstr?dlopen_file_spec_cstr.get():"unspecifed",
1.54 paf 174: error);
175:
176: // cache it
1.69.2.4 paf 177: put_driver_to_cache(global_protocol, driver);
1.54 paf 178: }
179:
1.69.2.4 paf 180: connection=SQL_ConnectionPtr(new SQL_Connection(global_url, *driver));
181: // associate with pool[request] (deassociates at close)
182: connection->set_pool(&apool);
1.54 paf 183: }
184:
1.58 paf 185: // if not connected yet, do that now, when connection has services
186: if(!connection->connected())
187: connection->connect(request_url_cstr);
188: // return autoclosing object for it
1.69.2.1 paf 189: return SQL_ConnectionPtr(connection);
1.54 paf 190: }
191:
1.69.2.4 paf 192: void SQL_Driver_manager::close_connection(connection_cache_type::key_type url,
193: SQL_ConnectionPtr connection) {
194: // deassociate from pool[request]
195: connection->set_pool(0);
1.54 paf 196: put_connection_to_cache(url, connection);
197: }
198:
199:
200: // driver cache
201:
1.69.2.4 paf 202: SQL_Driver *SQL_Driver_manager::get_driver_from_cache(driver_cache_type::key_type protocol) {
1.54 paf 203: SYNCHRONIZED;
204:
1.69.2.4 paf 205: return driver_cache.get(protocol);
1.54 paf 206: }
207:
1.69.2.4 paf 208: void SQL_Driver_manager::put_driver_to_cache(
209: driver_cache_type::key_type protocol,
210: driver_cache_type::value_type driver) {
1.54 paf 211: SYNCHRONIZED;
212:
1.69.2.4 paf 213: driver_cache.put(protocol, driver);
1.54 paf 214: }
215:
216: // connection cache
1.69.2.15 paf 217: /// @todo get rid of memory spending Stack [zeros deep inside got accumulated]
1.69.2.4 paf 218: SQL_ConnectionPtr SQL_Driver_manager::get_connection_from_cache(
219: connection_cache_type::key_type url) {
1.54 paf 220: SYNCHRONIZED;
221:
1.69.2.4 paf 222: if(connection_cache_type::value_type connections=connection_cache.get(url))
1.54 paf 223: while(connections->top_index()>=0) { // there are cached connections to that 'url'
1.69.2.4 paf 224: SQL_ConnectionPtr result=connections->pop();
1.54 paf 225: if(result->connected()) // not expired?
226: return result;
227: }
228:
1.69.2.10 paf 229: return SQL_ConnectionPtr(0);
1.54 paf 230: }
231:
1.69.2.4 paf 232: void SQL_Driver_manager::put_connection_to_cache(
233: connection_cache_type::key_type url,
234: SQL_ConnectionPtr connection) {
1.54 paf 235: SYNCHRONIZED;
236:
1.69.2.4 paf 237: connection_cache_type::value_type connections=connection_cache.get(url);
1.54 paf 238: if(!connections) { // there are no cached connections to that 'url' yet?
1.69.2.4 paf 239: connections=connection_cache_type::value_type(new connection_cache_type::value_type::element_type);
1.54 paf 240: connection_cache.put(url, connections);
241: }
1.69.2.4 paf 242: connections->push(connection);
1.54 paf 243: }
244:
245: void SQL_Driver_manager::maybe_expire_cache() {
246: time_t now=time(0);
247:
248: if(prev_expiration_pass_time<now-CHECK_EXPIRED_CONNECTIONS_SECONDS) {
1.69.2.4 paf 249: connection_cache.for_each(expire_connections, time_t(now-EXPIRE_UNUSED_CONNECTION_SECONDS));
1.54 paf 250:
251: prev_expiration_pass_time=now;
252: }
253: }
1.69.2.4 paf 254: /*
1.54 paf 255: static void add_connection_to_status_cache_table(Array::Item *value, void *info) {
256: SQL_Connection& connection=*static_cast<SQL_Connection *>(value);
257: Table& table=*static_cast<Table *>(info);
258:
259: if(connection.connected()) {
1.69.2.17.2.1! (paf 260:: =table.pool();
! 261:: Array& row=*new Array();
1.54 paf 262:
263: // url
264: row+=&url_without_login(pool, connection.get_url());
265: // time
1.58 paf 266: time_t time_used=connection.get_time_used();
1.69.2.9 paf 267: const char* unsafe_time_cstr=ctime(&time_used);
1.54 paf 268: int time_buf_size=strlen(unsafe_time_cstr);
1.69.2.13 paf 269: char *safe_time_buf=pool.copy(unsafe_time_cstr, time_buf_size);
1.69.2.17.2.1! (paf 270:: row+=new String(pool, safe_time_buf, time_buf_size);
1.54 paf 271:
272: table+=&row;
273: }
274: }
275: static void add_connections_to_status_cache_table(const Hash::Key& key, Hash::Val *value, void *info) {
276: Stack& stack=*static_cast<Stack *>(value);
277: Array_iter iter(stack);
278: for(int countdown=stack.top_index(); countdown-->=0; )
279: add_connection_to_status_cache_table(iter.next(), info);
1.69.2.4 paf 280: }*/
281: /// @todo convert to object_ptr
1.69.2.17.2.1! (paf 282:: ValuePtr SQL_Driver_manager::get_statusconst String* source) {
1.69.2.4 paf 283: ValuePtr result(new VHash);
284: /*
1.54 paf 285: // cache
286: {
1.69.2.17.2.1! (paf 287:: Array& columns=*new Array();
! 288:: columns+=new String(pool, "url");
! 289:: columns+=new String(pool, "time");
! 290:: Table& table=*new Table(pool, 0, &columns, connection_cache.size());
1.54 paf 291:
292: connection_cache.for_each(add_connections_to_status_cache_table, &table);
293:
1.69.2.17.2.1! (paf 294:: result.hash(source).put(*new String(pool, "cache"), new VTable(pool, &table));
1.69.2.4 paf 295: }*/
1.54 paf 296:
297: return result;
1.57 paf 298: }
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