Annotation of parser3/src/main/pa_sql_driver_manager.C, revision 1.69.2.17.2.10
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: 2003/03/24 17:24:42 $";
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;
1.69.2.17.2.8 (paf 32:: result << furl->mid(0, furl->pos(':')) << "://****";
1.54 paf 33:
1.69.2.17.2.8 (paf 34:: size_t at_pos=furl->pos('@');
1.69.2.17.2.7 (paf 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(
1.69.2.17.2.9 (paf 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) {
1.69.2.3 paf 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
1.69.2.17.2.1 (paf 93:): url_cstr=aurl.cstrm();
94:): if(!strstr(url_cstr, "://"))
1.62 paf 95: throw Exception("parser.runtime",
1.69.2.17.2.5 (paf 96:: aurl.length()?&aurl:0,
1.62 paf 97: "connection string must start with protocol://");
1.69.2.17.2.1 (paf 98:):
1.54 paf 99:
1.69.2.17.2.5 (paf 100:: char *protocol_cstr=lsplit(&url_cstr, ':');
1.54 paf 101: // skip "//" after ':'
1.69.2.17.2.5 (paf 102:: while(*url_cstr=='/')
103:: url_cstr++;
104:: const String& protocol=*new String(protocol_cstr);
1.54 paf 105:
106: SQL_Driver *driver;
107: // first trying to get cached driver
1.69.2.17.2.5 (paf 108:: if(!(driver=get_driver_from_cache(protocol))) {
1.54 paf 109: // no cached
1.69.2.17.2.5 (paf 110:: const String* library=0;
111:: const String* dlopen_file_spec=0;
112:: if(protocol2driver_and_client->locate(0, protocol)) {
1.69.2.17.2.3 (paf 113:: if(!(library=protocol2driver_and_client->item(1)) || library->length()==0)
1.62 paf 114: throw Exception("parser.runtime",
1.69.2.17.2.5 (paf 115:: 0,
1.54 paf 116: "driver library column for protocol '%s' is empty",
1.69.2.17.2.5 (paf 117:: protocol_cstr);
1.54 paf 118: dlopen_file_spec=protocol2driver_and_client->item(2);
119: } else
1.62 paf 120: throw Exception("parser.runtime",
1.69.2.17.2.5 (paf 121:: &aurl,
1.54 paf 122: "undefined protocol '%s'",
1.69.2.17.2.5 (paf 123:: protocol_cstr);
1.54 paf 124:
1.69.2.17 paf 125: if(!is_dlinited) {
126: if(lt_dlinit())
127: throw Exception(0,
128: library,
129: "prepare to dynamic loading failed, %s", lt_dlerror());
130:
131: is_dlinited=true;
132: }
1.54 paf 133:
1.69.2.17.2.4 (paf 134:: const char* filename=library->cstr(String::L_FILE_SPEC);
1.54 paf 135: lt_dlhandle handle=lt_dlopen(filename);
136: if (!handle)
1.62 paf 137: throw Exception(0,
1.54 paf 138: library,
139: "can not open the module, %s", lt_dlerror());
140:
141: SQL_Driver_create_func create=(SQL_Driver_create_func)lt_dlsym(handle,
142: SQL_DRIVER_CREATE_NAME);
143: if(!create)
1.62 paf 144: throw Exception(0,
1.54 paf 145: library,
146: "function '"SQL_DRIVER_CREATE_NAME"' was not found");
147:
148: // create library-driver!
149: driver=(*create)();
150:
151: // validate driver api version
152: int driver_api_version=driver->api_version();
153: if(driver_api_version!=SQL_DRIVER_API_VERSION)
1.62 paf 154: throw Exception(0,
1.54 paf 155: library,
156: "driver implements API version 0x%04X not equal to 0x%04X",
157: driver_api_version, SQL_DRIVER_API_VERSION);
158:
159: // initialise by connecting to sql client dynamic link library
1.69.2.17.2.5 (paf 160:: char* dlopen_file_spec_cstr=
1.69.2.17.2.3 (paf 161:: dlopen_file_spec && dlopen_file_spec->length()?
1.69.2.17.2.5 (paf 162:: dlopen_file_spec->cstrm(String::L_AS_IS):0;
163:: if(const char* error=driver->initialize(dlopen_file_spec_cstr))
1.62 paf 164: throw Exception(0,
1.54 paf 165: library,
166: "driver failed to initialize client library '%s', %s",
1.69.2.17.2.5 (paf 167:: dlopen_file_spec_cstr?dlopen_file_spec_cstr:"unspecifed",
1.54 paf 168: error);
169:
170: // cache it
1.69.2.17.2.5 (paf 171:: put_driver_to_cache(protocol, driver);
1.54 paf 172: }
173:
1.69.2.17.2.5 (paf 174:: connection=new SQL_Connection(aurl, *driver);
1.69.2.4 paf 175: // associate with pool[request] (deassociates at close)
1.69.2.17.2.5 (paf 176:: connection->set_url();
1.54 paf 177: }
178:
1.58 paf 179: // if not connected yet, do that now, when connection has services
180: if(!connection->connected())
1.69.2.17.2.5 (paf 181:: connection->connect(url_cstr);
1.58 paf 182: // return autoclosing object for it
1.69.2.17.2.5 (paf 183:: return connection;
1.54 paf 184: }
185:
1.69.2.4 paf 186: void SQL_Driver_manager::close_connection(connection_cache_type::key_type url,
1.69.2.17.2.5 (paf 187:: SQL_Connection* connection) {
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]
1.69.2.17.2.5 (paf 210:: SQL_Connection* SQL_Driver_manager::get_connection_from_cache(
1.69.2.4 paf 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'
1.69.2.17.2.5 (paf 216:: SQL_Connection* result=connections->pop();
1.54 paf 217: if(result->connected()) // not expired?
218: return result;
219: }
220:
1.69.2.17.2.5 (paf 221:: return 0;
1.54 paf 222: }
223:
1.69.2.4 paf 224: void SQL_Driver_manager::put_connection_to_cache(
1.69.2.17.2.5 (paf 225:: connection_cache_type::key_type url,
226:: SQL_Connection* 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?
1.69.2.17.2.5 (paf 231:: connections=new connection_cache_element_base_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) {
1.69.2.17.2.4 (paf 248:: SQL_Connection& connection=*static_cast<SQL_Connection* >(value);
1.54 paf 249: Table& table=*static_cast<Table *>(info);
250:
251: if(connection.connected()) {
1.69.2.17.2.1 (paf 252:: =table.pool();
253:: Array& row=*new Array();
1.54 paf 254:
255: // url
1.69.2.17.2.2 (paf 256:: row+=&url_without_login(connection.get_url());
1.54 paf 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);
1.69.2.17.2.2 (paf 262:: row+=new String(safe_time_buf, time_buf_size);
1.54 paf 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
1.69.2.17.2.5 (paf 274:: Value* SQL_Driver_manager::get_status() {
275:: Value* result=new VHash;
1.69.2.4 paf 276: /*
1.54 paf 277: // cache
278: {
1.69.2.17.2.1 (paf 279:: Array& columns=*new Array();
1.69.2.17.2.2 (paf 280:: columns+=new String("url");
281:: columns+=new String("time");
1.69.2.17.2.3 (paf 282:: Table& table=*new Table(0, &columns, connection_cache.length());
1.54 paf 283:
284: connection_cache.for_each(add_connections_to_status_cache_table, &table);
285:
1.69.2.17.2.2 (paf 286:: result.hash(source).put(*new String("cache"), new VTable(&table));
1.69.2.4 paf 287: }*/
1.54 paf 288:
289: return result;
1.57 paf 290: }
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