Annotation of parser3/src/main/pa_sql_driver_manager.C, revision 1.69.2.5
1.54 paf 1: /** @file
2: Parser: sql driver manager implementation.
3:
1.69 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:
1.69.2.5! paf 8: static const char* IDENT_SQL_DRIVER_MANAGER_C="$Date: 2003/01/28 09:48:16 $";
1.54 paf 9:
10: #include "pa_sql_driver_manager.h"
11: #include "ltdl.h"
12: #include "pa_sql_connection.h"
13: #include "pa_exception.h"
14: #include "pa_common.h"
15: #include "pa_threads.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:
1.69.2.3 paf 30: ConstStringPtr SQL_Driver_services_impl::url_without_login() const {
31: StringPtr 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():
58: prev_expiration_pass_time(0) {
1.54 paf 59: }
60:
61: SQL_Driver_manager::~SQL_Driver_manager() {
1.69.2.3 paf 62: connection_cache.for_each(expire_connections, time(0)+(time_t)1/*=in future=expire all*/);
1.54 paf 63: }
64:
1.69.2.4 paf 65: /// @param aurl protocol://[driver-dependent]
66: SQL_ConnectionPtr SQL_Driver_manager::get_connection(Pool& apool, ConstStringPtr arequest_url,
1.69.2.3 paf 67: ConstStringPtr aorigin,
1.54 paf 68: Table *protocol2driver_and_client) {
69: // we have table for locating protocol's library
70: if(!protocol2driver_and_client)
1.62 paf 71: throw Exception("parser.runtime",
1.69.2.4 paf 72: arequest_url,
1.54 paf 73: "$"MAIN_SQL_NAME":"MAIN_SQL_DRIVERS_NAME" table must be defined");
74:
75: // first trying to get cached connection
1.69.2.4 paf 76: SQL_ConnectionPtr connection=get_connection_from_cache(arequest_url);
1.58 paf 77: if(connection) {
1.69.2.4 paf 78: connection->set_pool(&apool);
1.58 paf 79: if(!connection->ping()) { // we have some cached connection, is it pingable?
80: connection->disconnect(); // kill unpingabe=dead connection
1.69.2.4 paf 81: connection=SQL_ConnectionPtr(0);
1.54 paf 82: }
83: }
84:
85: char *request_url_cstr;
1.58 paf 86: if(connection)
1.54 paf 87: request_url_cstr=0; // calm, compiler
88: else { // no cached connection or it were unpingabe: connect/reconnect
1.69.2.4 paf 89: if(arequest_url->pos("://")<0)
1.62 paf 90: throw Exception("parser.runtime",
1.69.2.4 paf 91: arequest_url->size()?arequest_url:aorigin,
1.62 paf 92: "connection string must start with protocol://");
1.54 paf 93:
1.69.2.5! paf 94: // make global_url C-string on driver_cache_pool pool
! 95: StringPtr global_url(new String(arequest_url->cstr(driver_cache_pool)));
1.54 paf 96:
1.69.2.4 paf 97: request_url_cstr=arequest_url->cstr();
1.54 paf 98: char *request_protocol_cstr=lsplit(&request_url_cstr, ':');
99: // skip "//" after ':'
100: while(*request_url_cstr=='/')
101: request_url_cstr++;
1.69.2.5! paf 102: // make global_protocol C-string on driver_cache_pool pool
! 103: StringPtr global_protocol(new String(driver_cache_pool.copy(request_protocol_cstr)));
1.54 paf 104:
105: SQL_Driver *driver;
106: // first trying to get cached driver
107: if(!(driver=get_driver_from_cache(global_protocol))) {
108: // no cached
1.69.2.4 paf 109: ConstStringPtr library(0);
110: ConstStringPtr dlopen_file_spec(0);
1.54 paf 111: if(protocol2driver_and_client->locate(0, global_protocol)) {
112: if(!(library=protocol2driver_and_client->item(1)) || library->size()==0)
1.62 paf 113: throw Exception("parser.runtime",
1.54 paf 114: protocol2driver_and_client->origin_string(),
115: "driver library column for protocol '%s' is empty",
116: request_protocol_cstr);
117: dlopen_file_spec=protocol2driver_and_client->item(2);
118: } else
1.62 paf 119: throw Exception("parser.runtime",
1.69.2.4 paf 120: arequest_url,
1.54 paf 121: "undefined protocol '%s'",
122: request_protocol_cstr);
123:
124: if(lt_dlinit())
1.62 paf 125: throw Exception(0,
1.54 paf 126: library,
127: "prepare to dynamic loading failed, %s", lt_dlerror());
128:
129: const char *filename=library->cstr(String::UL_FILE_SPEC);
130: lt_dlhandle handle=lt_dlopen(filename);
131: if (!handle)
1.62 paf 132: throw Exception(0,
1.54 paf 133: library,
134: "can not open the module, %s", lt_dlerror());
135:
136: SQL_Driver_create_func create=(SQL_Driver_create_func)lt_dlsym(handle,
137: SQL_DRIVER_CREATE_NAME);
138: if(!create)
1.62 paf 139: throw Exception(0,
1.54 paf 140: library,
141: "function '"SQL_DRIVER_CREATE_NAME"' was not found");
142:
143: // create library-driver!
144: driver=(*create)();
145:
146: // validate driver api version
147: int driver_api_version=driver->api_version();
148: if(driver_api_version!=SQL_DRIVER_API_VERSION)
1.62 paf 149: throw Exception(0,
1.54 paf 150: library,
151: "driver implements API version 0x%04X not equal to 0x%04X",
152: driver_api_version, SQL_DRIVER_API_VERSION);
153:
154: // initialise by connecting to sql client dynamic link library
1.69.2.4 paf 155: CharPtr dlopen_file_spec_cstr=
1.54 paf 156: dlopen_file_spec && dlopen_file_spec->size()?
1.69.2.4 paf 157: dlopen_file_spec->cstr(String::UL_AS_IS):CharPtrZero;
1.54 paf 158: if(const char *error=driver->initialize(
159: dlopen_file_spec_cstr))
1.62 paf 160: throw Exception(0,
1.54 paf 161: library,
162: "driver failed to initialize client library '%s', %s",
163: dlopen_file_spec_cstr?dlopen_file_spec_cstr:"unspecifed",
164: error);
165:
166: // cache it
1.69.2.4 paf 167: put_driver_to_cache(global_protocol, driver);
1.54 paf 168: }
169:
1.69.2.4 paf 170: connection=SQL_ConnectionPtr(new SQL_Connection(global_url, *driver));
171: // associate with pool[request] (deassociates at close)
172: connection->set_pool(&apool);
1.54 paf 173: }
174:
1.58 paf 175: // if not connected yet, do that now, when connection has services
176: if(!connection->connected())
177: connection->connect(request_url_cstr);
178: // return autoclosing object for it
1.69.2.1 paf 179: return SQL_ConnectionPtr(connection);
1.54 paf 180: }
181:
1.69.2.4 paf 182: void SQL_Driver_manager::close_connection(connection_cache_type::key_type url,
183: SQL_ConnectionPtr connection) {
184: // deassociate from pool[request]
185: connection->set_pool(0);
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
1.69.2.4 paf 207: SQL_ConnectionPtr SQL_Driver_manager::get_connection_from_cache(
208: connection_cache_type::key_type url) {
1.54 paf 209: SYNCHRONIZED;
210:
1.69.2.4 paf 211: if(connection_cache_type::value_type connections=connection_cache.get(url))
1.54 paf 212: while(connections->top_index()>=0) { // there are cached connections to that 'url'
1.69.2.4 paf 213: SQL_ConnectionPtr result=connections->pop();
1.54 paf 214: if(result->connected()) // not expired?
215: return result;
216: }
217:
218: return 0;
219: }
220:
1.69.2.4 paf 221: void SQL_Driver_manager::put_connection_to_cache(
222: connection_cache_type::key_type url,
223: SQL_ConnectionPtr connection) {
1.54 paf 224: SYNCHRONIZED;
225:
1.69.2.4 paf 226: connection_cache_type::value_type connections=connection_cache.get(url);
1.54 paf 227: if(!connections) { // there are no cached connections to that 'url' yet?
1.69.2.4 paf 228: connections=connection_cache_type::value_type(new connection_cache_type::value_type::element_type);
1.54 paf 229: connection_cache.put(url, connections);
230: }
1.69.2.4 paf 231: connections->push(connection);
1.54 paf 232: }
233:
234: void SQL_Driver_manager::maybe_expire_cache() {
235: time_t now=time(0);
236:
237: if(prev_expiration_pass_time<now-CHECK_EXPIRED_CONNECTIONS_SECONDS) {
1.69.2.4 paf 238: connection_cache.for_each(expire_connections, time_t(now-EXPIRE_UNUSED_CONNECTION_SECONDS));
1.54 paf 239:
240: prev_expiration_pass_time=now;
241: }
242: }
1.69.2.4 paf 243: /*
1.54 paf 244: static void add_connection_to_status_cache_table(Array::Item *value, void *info) {
245: SQL_Connection& connection=*static_cast<SQL_Connection *>(value);
246: Table& table=*static_cast<Table *>(info);
247:
248: if(connection.connected()) {
249: Pool& pool=table.pool();
250: Array& row=*new(pool) Array(pool);
251:
252: // url
253: row+=&url_without_login(pool, connection.get_url());
254: // time
1.58 paf 255: time_t time_used=connection.get_time_used();
256: const char *unsafe_time_cstr=ctime(&time_used);
1.54 paf 257: int time_buf_size=strlen(unsafe_time_cstr);
258: char *safe_time_buf=(char *)pool.malloc(time_buf_size);
259: memcpy(safe_time_buf, unsafe_time_cstr, time_buf_size);
260: row+=new(pool) String(pool, safe_time_buf, time_buf_size);
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
1.69.2.2 paf 272: ValuePtr SQL_Driver_manager::get_status(Pool& pool, ConstStringPtr source) {
1.69.2.4 paf 273: ValuePtr result(new VHash);
274: /*
1.54 paf 275: // cache
276: {
277: Array& columns=*new(pool) Array(pool);
278: columns+=new(pool) String(pool, "url");
279: columns+=new(pool) String(pool, "time");
280: Table& table=*new(pool) Table(pool, 0, &columns, connection_cache.size());
281:
282: connection_cache.for_each(add_connections_to_status_cache_table, &table);
283:
284: result.hash(source).put(*new(pool) String(pool, "cache"), new(pool) VTable(pool, &table));
1.69.2.4 paf 285: }*/
1.54 paf 286:
287: return result;
1.57 paf 288: }
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