Annotation of parser3/src/main/pa_sql_driver_manager.C, revision 1.69.2.9
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:
1.69.2.9! paf 8: static const char* IDENT_SQL_DRIVER_MANAGER_C="$Date: 2003/01/31 12:10:47 $";
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"
1.69.2.7 paf 16: #include "pa_value_includes.h"
1.54 paf 17: #include "pa_vhash.h"
18: #include "pa_vtable.h"
19:
20: // globals
21:
1.69.2.1 paf 22: SQL_Driver_manager SQL_driver_manager;
1.54 paf 23:
24: // consts
25:
1.69.2.4 paf 26: const time_t EXPIRE_UNUSED_CONNECTION_SECONDS=60;
27: const time_t CHECK_EXPIRED_CONNECTIONS_SECONDS=EXPIRE_UNUSED_CONNECTION_SECONDS*2;
1.54 paf 28:
29: // helpers
30:
1.69.2.8 paf 31: StringPtr SQL_Driver_services_impl::url_without_login() const {
1.69.2.3 paf 32: StringPtr result(new String);
1.69.2.4 paf 33: *result << furl->mid(0, furl->pos(":")) << "://****";
1.54 paf 34:
1.69.2.4 paf 35: int at_pos=furl->pos("@");
1.54 paf 36: if(at_pos>0)
1.69.2.4 paf 37: *result << furl->mid(at_pos, furl->size());
1.54 paf 38:
39: return result;
40: }
41:
42: // helpers
43:
1.69.2.3 paf 44: static void expire_connection(SQL_Connection& connection, time_t older_dies) {
1.54 paf 45: if(connection.connected() && connection.expired(older_dies))
46: connection.disconnect();
47: }
1.69.2.3 paf 48: static void expire_connections(
49: SQL_Driver_manager::connection_cache_type::key_type /*key*/,
50: SQL_Driver_manager::connection_cache_type::value_type stack,
51: time_t older_dies) {
52: for(int i=0; i<=stack->top_index(); i++)
53: expire_connection(*stack->get(i), older_dies);
1.54 paf 54: }
55:
56: // SQL_Driver_manager
57:
1.69.2.1 paf 58: SQL_Driver_manager::SQL_Driver_manager():
59: prev_expiration_pass_time(0) {
1.69.2.6 paf 60:
1.69.2.8 paf 61: cache_managers.put(StringPtr(new String("sql")), this);
1.54 paf 62: }
63:
64: SQL_Driver_manager::~SQL_Driver_manager() {
1.69.2.3 paf 65: connection_cache.for_each(expire_connections, time(0)+(time_t)1/*=in future=expire all*/);
1.54 paf 66: }
67:
1.69.2.4 paf 68: /// @param aurl protocol://[driver-dependent]
1.69.2.8 paf 69: SQL_ConnectionPtr SQL_Driver_manager::get_connection(Pool& apool, StringPtr arequest_url,
70: StringPtr aorigin,
1.54 paf 71: Table *protocol2driver_and_client) {
72: // we have table for locating protocol's library
73: if(!protocol2driver_and_client)
1.62 paf 74: throw Exception("parser.runtime",
1.69.2.4 paf 75: arequest_url,
1.54 paf 76: "$"MAIN_SQL_NAME":"MAIN_SQL_DRIVERS_NAME" table must be defined");
77:
78: // first trying to get cached connection
1.69.2.4 paf 79: SQL_ConnectionPtr connection=get_connection_from_cache(arequest_url);
1.58 paf 80: if(connection) {
1.69.2.4 paf 81: connection->set_pool(&apool);
1.58 paf 82: if(!connection->ping()) { // we have some cached connection, is it pingable?
83: connection->disconnect(); // kill unpingabe=dead connection
1.69.2.4 paf 84: connection=SQL_ConnectionPtr(0);
1.54 paf 85: }
86: }
87:
88: char *request_url_cstr;
1.58 paf 89: if(connection)
1.54 paf 90: request_url_cstr=0; // calm, compiler
91: else { // no cached connection or it were unpingabe: connect/reconnect
1.69.2.4 paf 92: if(arequest_url->pos("://")<0)
1.62 paf 93: throw Exception("parser.runtime",
1.69.2.4 paf 94: arequest_url->size()?arequest_url:aorigin,
1.62 paf 95: "connection string must start with protocol://");
1.54 paf 96:
1.69.2.5 paf 97: // make global_url C-string on driver_cache_pool pool
98: StringPtr global_url(new String(arequest_url->cstr(driver_cache_pool)));
1.54 paf 99:
1.69.2.4 paf 100: request_url_cstr=arequest_url->cstr();
1.54 paf 101: char *request_protocol_cstr=lsplit(&request_url_cstr, ':');
102: // skip "//" after ':'
103: while(*request_url_cstr=='/')
104: request_url_cstr++;
1.69.2.5 paf 105: // make global_protocol C-string on driver_cache_pool pool
106: StringPtr global_protocol(new String(driver_cache_pool.copy(request_protocol_cstr)));
1.54 paf 107:
108: SQL_Driver *driver;
109: // first trying to get cached driver
110: if(!(driver=get_driver_from_cache(global_protocol))) {
111: // no cached
1.69.2.8 paf 112: StringPtr library(0);
113: StringPtr dlopen_file_spec(0);
1.54 paf 114: if(protocol2driver_and_client->locate(0, global_protocol)) {
115: if(!(library=protocol2driver_and_client->item(1)) || library->size()==0)
1.62 paf 116: throw Exception("parser.runtime",
1.54 paf 117: protocol2driver_and_client->origin_string(),
118: "driver library column for protocol '%s' is empty",
119: request_protocol_cstr);
120: dlopen_file_spec=protocol2driver_and_client->item(2);
121: } else
1.62 paf 122: throw Exception("parser.runtime",
1.69.2.4 paf 123: arequest_url,
1.54 paf 124: "undefined protocol '%s'",
125: request_protocol_cstr);
126:
127: if(lt_dlinit())
1.62 paf 128: throw Exception(0,
1.54 paf 129: library,
130: "prepare to dynamic loading failed, %s", lt_dlerror());
131:
1.69.2.9! paf 132: const char* filename=library->cstr(String::UL_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
1.69.2.4 paf 158: CharPtr dlopen_file_spec_cstr=
1.54 paf 159: dlopen_file_spec && dlopen_file_spec->size()?
1.69.2.4 paf 160: dlopen_file_spec->cstr(String::UL_AS_IS):CharPtrZero;
1.69.2.9! paf 161: if(const char* error=driver->initialize(
1.54 paf 162: dlopen_file_spec_cstr))
1.62 paf 163: throw Exception(0,
1.54 paf 164: library,
165: "driver failed to initialize client library '%s', %s",
166: dlopen_file_spec_cstr?dlopen_file_spec_cstr:"unspecifed",
167: error);
168:
169: // cache it
1.69.2.4 paf 170: put_driver_to_cache(global_protocol, driver);
1.54 paf 171: }
172:
1.69.2.4 paf 173: connection=SQL_ConnectionPtr(new SQL_Connection(global_url, *driver));
174: // associate with pool[request] (deassociates at close)
175: connection->set_pool(&apool);
1.54 paf 176: }
177:
1.58 paf 178: // if not connected yet, do that now, when connection has services
179: if(!connection->connected())
180: connection->connect(request_url_cstr);
181: // return autoclosing object for it
1.69.2.1 paf 182: return SQL_ConnectionPtr(connection);
1.54 paf 183: }
184:
1.69.2.4 paf 185: void SQL_Driver_manager::close_connection(connection_cache_type::key_type url,
186: SQL_ConnectionPtr connection) {
187: // deassociate from pool[request]
188: connection->set_pool(0);
1.54 paf 189: put_connection_to_cache(url, connection);
190: }
191:
192:
193: // driver cache
194:
1.69.2.4 paf 195: SQL_Driver *SQL_Driver_manager::get_driver_from_cache(driver_cache_type::key_type protocol) {
1.54 paf 196: SYNCHRONIZED;
197:
1.69.2.4 paf 198: return driver_cache.get(protocol);
1.54 paf 199: }
200:
1.69.2.4 paf 201: void SQL_Driver_manager::put_driver_to_cache(
202: driver_cache_type::key_type protocol,
203: driver_cache_type::value_type driver) {
1.54 paf 204: SYNCHRONIZED;
205:
1.69.2.4 paf 206: driver_cache.put(protocol, driver);
1.54 paf 207: }
208:
209: // connection cache
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:
221: return 0;
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);
261: char *safe_time_buf=(char *)pool.malloc(time_buf_size);
262: memcpy(safe_time_buf, unsafe_time_cstr, time_buf_size);
263: row+=new(pool) String(pool, safe_time_buf, time_buf_size);
264:
265: table+=&row;
266: }
267: }
268: static void add_connections_to_status_cache_table(const Hash::Key& key, Hash::Val *value, void *info) {
269: Stack& stack=*static_cast<Stack *>(value);
270: Array_iter iter(stack);
271: for(int countdown=stack.top_index(); countdown-->=0; )
272: add_connection_to_status_cache_table(iter.next(), info);
1.69.2.4 paf 273: }*/
274: /// @todo convert to object_ptr
1.69.2.8 paf 275: ValuePtr SQL_Driver_manager::get_status(Pool& pool, StringPtr source) {
1.69.2.4 paf 276: ValuePtr result(new VHash);
277: /*
1.54 paf 278: // cache
279: {
280: Array& columns=*new(pool) Array(pool);
281: columns+=new(pool) String(pool, "url");
282: columns+=new(pool) String(pool, "time");
283: Table& table=*new(pool) Table(pool, 0, &columns, connection_cache.size());
284:
285: connection_cache.for_each(add_connections_to_status_cache_table, &table);
286:
287: result.hash(source).put(*new(pool) String(pool, "cache"), new(pool) VTable(pool, &table));
1.69.2.4 paf 288: }*/
1.54 paf 289:
290: return result;
1.57 paf 291: }
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