Annotation of parser3/src/main/pa_sql_driver_manager.C, revision 1.69.2.15
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:
1.69.2.15! paf 8: static const char* IDENT_SQL_DRIVER_MANAGER_C="$Date: 2003/02/21 08:50:02 $";
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:
1.69.2.8 paf 30: StringPtr SQL_Driver_services_impl::url_without_login() const {
1.69.2.3 paf 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) {
1.69.2.6 paf 59:
1.69.2.8 paf 60: cache_managers.put(StringPtr(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*/);
1.54 paf 65: }
66:
1.69.2.4 paf 67: /// @param aurl protocol://[driver-dependent]
1.69.2.8 paf 68: SQL_ConnectionPtr SQL_Driver_manager::get_connection(Pool& apool, StringPtr arequest_url,
69: StringPtr aorigin,
1.54 paf 70: Table *protocol2driver_and_client) {
71: // we have table for locating protocol's library
72: if(!protocol2driver_and_client)
1.62 paf 73: throw Exception("parser.runtime",
1.69.2.4 paf 74: arequest_url,
1.54 paf 75: "$"MAIN_SQL_NAME":"MAIN_SQL_DRIVERS_NAME" table must be defined");
76:
77: // first trying to get cached connection
1.69.2.4 paf 78: SQL_ConnectionPtr connection=get_connection_from_cache(arequest_url);
1.58 paf 79: if(connection) {
1.69.2.4 paf 80: connection->set_pool(&apool);
1.58 paf 81: if(!connection->ping()) { // we have some cached connection, is it pingable?
82: connection->disconnect(); // kill unpingabe=dead connection
1.69.2.4 paf 83: connection=SQL_ConnectionPtr(0);
1.54 paf 84: }
85: }
86:
87: char *request_url_cstr;
1.58 paf 88: if(connection)
1.54 paf 89: request_url_cstr=0; // calm, compiler
90: else { // no cached connection or it were unpingabe: connect/reconnect
1.69.2.4 paf 91: if(arequest_url->pos("://")<0)
1.62 paf 92: throw Exception("parser.runtime",
1.69.2.4 paf 93: arequest_url->size()?arequest_url:aorigin,
1.62 paf 94: "connection string must start with protocol://");
1.54 paf 95:
1.69.2.5 paf 96: // make global_url C-string on driver_cache_pool pool
97: StringPtr global_url(new String(arequest_url->cstr(driver_cache_pool)));
1.54 paf 98:
1.69.2.4 paf 99: request_url_cstr=arequest_url->cstr();
1.54 paf 100: char *request_protocol_cstr=lsplit(&request_url_cstr, ':');
101: // skip "//" after ':'
102: while(*request_url_cstr=='/')
103: request_url_cstr++;
1.69.2.5 paf 104: // make global_protocol C-string on driver_cache_pool pool
105: StringPtr global_protocol(new String(driver_cache_pool.copy(request_protocol_cstr)));
1.54 paf 106:
107: SQL_Driver *driver;
108: // first trying to get cached driver
109: if(!(driver=get_driver_from_cache(global_protocol))) {
110: // no cached
1.69.2.8 paf 111: StringPtr library(0);
112: StringPtr dlopen_file_spec(0);
1.54 paf 113: if(protocol2driver_and_client->locate(0, global_protocol)) {
114: if(!(library=protocol2driver_and_client->item(1)) || library->size()==0)
1.62 paf 115: throw Exception("parser.runtime",
1.54 paf 116: protocol2driver_and_client->origin_string(),
117: "driver library column for protocol '%s' is empty",
118: request_protocol_cstr);
119: dlopen_file_spec=protocol2driver_and_client->item(2);
120: } else
1.62 paf 121: throw Exception("parser.runtime",
1.69.2.4 paf 122: arequest_url,
1.54 paf 123: "undefined protocol '%s'",
124: request_protocol_cstr);
125:
126: if(lt_dlinit())
1.62 paf 127: throw Exception(0,
1.54 paf 128: library,
129: "prepare to dynamic loading failed, %s", lt_dlerror());
130:
1.69.2.14 paf 131: CharPtr filename=library->cstr(String::UL_FILE_SPEC);
1.54 paf 132: lt_dlhandle handle=lt_dlopen(filename);
133: if (!handle)
1.62 paf 134: throw Exception(0,
1.54 paf 135: library,
136: "can not open the module, %s", lt_dlerror());
137:
138: SQL_Driver_create_func create=(SQL_Driver_create_func)lt_dlsym(handle,
139: SQL_DRIVER_CREATE_NAME);
140: if(!create)
1.62 paf 141: throw Exception(0,
1.54 paf 142: library,
143: "function '"SQL_DRIVER_CREATE_NAME"' was not found");
144:
145: // create library-driver!
146: driver=(*create)();
147:
148: // validate driver api version
149: int driver_api_version=driver->api_version();
150: if(driver_api_version!=SQL_DRIVER_API_VERSION)
1.62 paf 151: throw Exception(0,
1.54 paf 152: library,
153: "driver implements API version 0x%04X not equal to 0x%04X",
154: driver_api_version, SQL_DRIVER_API_VERSION);
155:
156: // initialise by connecting to sql client dynamic link library
1.69.2.4 paf 157: CharPtr dlopen_file_spec_cstr=
1.54 paf 158: dlopen_file_spec && dlopen_file_spec->size()?
1.69.2.12 paf 159: dlopen_file_spec->cstr(String::UL_AS_IS):CharPtr(0);
1.69.2.9 paf 160: if(const char* error=driver->initialize(
1.54 paf 161: 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",
1.69.2.10 paf 165: dlopen_file_spec_cstr?dlopen_file_spec_cstr.get():"unspecifed",
1.54 paf 166: error);
167:
168: // cache it
1.69.2.4 paf 169: put_driver_to_cache(global_protocol, driver);
1.54 paf 170: }
171:
1.69.2.4 paf 172: connection=SQL_ConnectionPtr(new SQL_Connection(global_url, *driver));
173: // associate with pool[request] (deassociates at close)
174: connection->set_pool(&apool);
1.54 paf 175: }
176:
1.58 paf 177: // if not connected yet, do that now, when connection has services
178: if(!connection->connected())
179: connection->connect(request_url_cstr);
180: // return autoclosing object for it
1.69.2.1 paf 181: return SQL_ConnectionPtr(connection);
1.54 paf 182: }
183:
1.69.2.4 paf 184: void SQL_Driver_manager::close_connection(connection_cache_type::key_type url,
185: SQL_ConnectionPtr connection) {
186: // deassociate from pool[request]
187: connection->set_pool(0);
1.54 paf 188: put_connection_to_cache(url, connection);
189: }
190:
191:
192: // driver cache
193:
1.69.2.4 paf 194: SQL_Driver *SQL_Driver_manager::get_driver_from_cache(driver_cache_type::key_type protocol) {
1.54 paf 195: SYNCHRONIZED;
196:
1.69.2.4 paf 197: return driver_cache.get(protocol);
1.54 paf 198: }
199:
1.69.2.4 paf 200: void SQL_Driver_manager::put_driver_to_cache(
201: driver_cache_type::key_type protocol,
202: driver_cache_type::value_type driver) {
1.54 paf 203: SYNCHRONIZED;
204:
1.69.2.4 paf 205: driver_cache.put(protocol, driver);
1.54 paf 206: }
207:
208: // connection cache
1.69.2.15! paf 209: /// @todo get rid of memory spending Stack [zeros deep inside got accumulated]
1.69.2.4 paf 210: SQL_ConnectionPtr SQL_Driver_manager::get_connection_from_cache(
211: connection_cache_type::key_type url) {
1.54 paf 212: SYNCHRONIZED;
213:
1.69.2.4 paf 214: if(connection_cache_type::value_type connections=connection_cache.get(url))
1.54 paf 215: while(connections->top_index()>=0) { // there are cached connections to that 'url'
1.69.2.4 paf 216: SQL_ConnectionPtr result=connections->pop();
1.54 paf 217: if(result->connected()) // not expired?
218: return result;
219: }
220:
1.69.2.10 paf 221: return SQL_ConnectionPtr(0);
1.54 paf 222: }
223:
1.69.2.4 paf 224: void SQL_Driver_manager::put_connection_to_cache(
225: connection_cache_type::key_type url,
226: SQL_ConnectionPtr connection) {
1.54 paf 227: SYNCHRONIZED;
228:
1.69.2.4 paf 229: connection_cache_type::value_type connections=connection_cache.get(url);
1.54 paf 230: if(!connections) { // there are no cached connections to that 'url' yet?
1.69.2.4 paf 231: connections=connection_cache_type::value_type(new connection_cache_type::value_type::element_type);
1.54 paf 232: connection_cache.put(url, connections);
233: }
1.69.2.4 paf 234: connections->push(connection);
1.54 paf 235: }
236:
237: void SQL_Driver_manager::maybe_expire_cache() {
238: time_t now=time(0);
239:
240: if(prev_expiration_pass_time<now-CHECK_EXPIRED_CONNECTIONS_SECONDS) {
1.69.2.4 paf 241: connection_cache.for_each(expire_connections, time_t(now-EXPIRE_UNUSED_CONNECTION_SECONDS));
1.54 paf 242:
243: prev_expiration_pass_time=now;
244: }
245: }
1.69.2.4 paf 246: /*
1.54 paf 247: static void add_connection_to_status_cache_table(Array::Item *value, void *info) {
248: SQL_Connection& connection=*static_cast<SQL_Connection *>(value);
249: Table& table=*static_cast<Table *>(info);
250:
251: if(connection.connected()) {
252: Pool& pool=table.pool();
253: Array& row=*new(pool) Array(pool);
254:
255: // url
256: row+=&url_without_login(pool, connection.get_url());
257: // time
1.58 paf 258: time_t time_used=connection.get_time_used();
1.69.2.9 paf 259: const char* unsafe_time_cstr=ctime(&time_used);
1.54 paf 260: int time_buf_size=strlen(unsafe_time_cstr);
1.69.2.13 paf 261: char *safe_time_buf=pool.copy(unsafe_time_cstr, time_buf_size);
1.54 paf 262: row+=new(pool) String(pool, safe_time_buf, time_buf_size);
263:
264: table+=&row;
265: }
266: }
267: static void add_connections_to_status_cache_table(const Hash::Key& key, Hash::Val *value, void *info) {
268: Stack& stack=*static_cast<Stack *>(value);
269: Array_iter iter(stack);
270: for(int countdown=stack.top_index(); countdown-->=0; )
271: add_connection_to_status_cache_table(iter.next(), info);
1.69.2.4 paf 272: }*/
273: /// @todo convert to object_ptr
1.69.2.8 paf 274: ValuePtr SQL_Driver_manager::get_status(Pool& pool, StringPtr source) {
1.69.2.4 paf 275: ValuePtr result(new VHash);
276: /*
1.54 paf 277: // cache
278: {
279: Array& columns=*new(pool) Array(pool);
280: columns+=new(pool) String(pool, "url");
281: columns+=new(pool) String(pool, "time");
282: Table& table=*new(pool) Table(pool, 0, &columns, connection_cache.size());
283:
284: connection_cache.for_each(add_connections_to_status_cache_table, &table);
285:
286: result.hash(source).put(*new(pool) String(pool, "cache"), new(pool) VTable(pool, &table));
1.69.2.4 paf 287: }*/
1.54 paf 288:
289: return result;
1.57 paf 290: }
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