Annotation of parser3/src/main/pa_sql_driver_manager.C, revision 1.80
1.54 paf 1: /** @file
2: Parser: sql driver manager implementation.
3:
1.71 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:
1.80 ! paf 8: static const char * const IDENT_SQL_DRIVER_MANAGER_C="$Date: 2003/12/19 14:30:52 $";
1.54 paf 9:
10: #include "pa_sql_driver_manager.h"
11: #include "ltdl.h"
1.71 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"
1.80 ! paf 18: #include "pa_charsets.h"
1.54 paf 19:
20: // globals
21:
1.78 paf 22: SQL_Driver_manager* SQL_driver_manager=0;
1.54 paf 23:
24: // consts
25:
1.71 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:
1.71 paf 31: const String& SQL_Driver_services_impl::url_without_login() const {
32: String& result=*new String;
33: result << furl->mid(0, furl->pos(':')) << "://****";
34:
35: size_t at_pos=furl->pos('@');
36: if(at_pos!=STRING_NOT_FOUND)
37: result << furl->mid(at_pos, furl->length());
1.54 paf 38:
39: return result;
40: }
41:
1.80 ! paf 42: void SQL_Driver_services_impl::transcode(const char* src, size_t src_length,
! 43: const char*& dst, size_t& dst_length,
! 44: const char* charset_from_name,
! 45: const char* charset_to_name
! 46: )
! 47: {
! 48: try {
! 49: String::C result=Charset::transcode(String::C(src, src_length),
! 50: charsets.get(charset_from_name),
! 51: charsets.get(charset_to_name));
! 52: dst=result.str;
! 53: dst_length=result.length;
! 54: } catch(const Exception& e) {
! 55: _throw(SQL_Error(e.type(), e.comment()));
! 56: } catch(...) {
! 57: _throw(SQL_Error(0, "unknown error while transcoding in sql driver"));
! 58: }
! 59: }
! 60:
1.54 paf 61: // helpers
62:
1.71 paf 63: static void expire_connection(SQL_Connection& connection, time_t older_dies) {
1.54 paf 64: if(connection.connected() && connection.expired(older_dies))
65: connection.disconnect();
66: }
1.71 paf 67: static void expire_connections(SQL_Driver_manager::connection_cache_type::key_type /*key*/,
68: SQL_Driver_manager::connection_cache_type::value_type stack,
69: time_t older_dies) {
1.73 paf 70: for(size_t i=0; i<stack->top_index(); i++)
1.71 paf 71: expire_connection(*stack->get(i), older_dies);
1.54 paf 72: }
73:
74: // SQL_Driver_manager
75:
1.71 paf 76: SQL_Driver_manager::SQL_Driver_manager():
1.75 paf 77: is_dlinited(false), prev_expiration_pass_time(0) {
1.54 paf 78: }
79:
80: SQL_Driver_manager::~SQL_Driver_manager() {
1.71 paf 81: connection_cache.for_each(expire_connections, time(0)+(time_t)1/*=in future=expire all*/);
82:
83: if(is_dlinited)
84: lt_dlexit();
1.54 paf 85: }
86:
1.71 paf 87: /// @param aurl protocol://[driver-dependent]
88: SQL_Connection* SQL_Driver_manager::get_connection(const String& aurl,
1.80 ! paf 89: Table *protocol2driver_and_client,
! 90: const char* arequest_charset) {
1.54 paf 91: // we have table for locating protocol's library
92: if(!protocol2driver_and_client)
1.62 paf 93: throw Exception("parser.runtime",
1.71 paf 94: &aurl,
1.54 paf 95: "$"MAIN_SQL_NAME":"MAIN_SQL_DRIVERS_NAME" table must be defined");
96:
97: // first trying to get cached connection
1.71 paf 98: SQL_Connection* connection=get_connection_from_cache(aurl);
1.58 paf 99: if(connection) {
1.71 paf 100: connection->set_url();
1.58 paf 101: if(!connection->ping()) { // we have some cached connection, is it pingable?
102: connection->disconnect(); // kill unpingabe=dead connection
103: connection=0;
1.54 paf 104: }
105: }
106:
1.71 paf 107: char *url_cstr;
1.58 paf 108: if(connection)
1.71 paf 109: url_cstr=0; // calm, compiler
1.54 paf 110: else { // no cached connection or it were unpingabe: connect/reconnect
1.71 paf 111: url_cstr=aurl.cstrm();
112: if(!strstr(url_cstr, "://"))
1.62 paf 113: throw Exception("parser.runtime",
1.71 paf 114: aurl.length()?&aurl:0,
1.62 paf 115: "connection string must start with protocol://");
1.54 paf 116:
1.71 paf 117:
118: char *protocol_cstr=lsplit(&url_cstr, ':');
1.54 paf 119: // skip "//" after ':'
1.71 paf 120: while(*url_cstr=='/')
121: url_cstr++;
122: const String& protocol=*new String(protocol_cstr);
1.54 paf 123:
124: SQL_Driver *driver;
125: // first trying to get cached driver
1.71 paf 126: if(!(driver=get_driver_from_cache(protocol))) {
1.54 paf 127: // no cached
1.71 paf 128: const String* library=0;
129: const String* dlopen_file_spec=0;
1.70 paf 130: Table::Action_options options;
1.71 paf 131: if(protocol2driver_and_client->locate(0, protocol, options)) {
132: if(!(library=protocol2driver_and_client->item(1)) || library->length()==0)
1.62 paf 133: throw Exception("parser.runtime",
1.71 paf 134: 0,
1.54 paf 135: "driver library column for protocol '%s' is empty",
1.71 paf 136: protocol_cstr);
1.54 paf 137: dlopen_file_spec=protocol2driver_and_client->item(2);
138: } else
1.62 paf 139: throw Exception("parser.runtime",
1.71 paf 140: &aurl,
1.54 paf 141: "undefined protocol '%s'",
1.71 paf 142: protocol_cstr);
143:
144: if(!is_dlinited) {
145: if(lt_dlinit())
146: throw Exception(0,
147: library,
148: "prepare to dynamic loading failed, %s", lt_dlerror());
1.54 paf 149:
1.71 paf 150: is_dlinited=true;
151: }
1.54 paf 152:
1.71 paf 153: const char* filename=library->cstr(String::L_FILE_SPEC);
1.54 paf 154: lt_dlhandle handle=lt_dlopen(filename);
1.79 paf 155: if (!handle) {
156: const char* error=lt_dlerror();
1.62 paf 157: throw Exception(0,
1.54 paf 158: library,
1.79 paf 159: error?error:"can not open the module");
160: }
1.54 paf 161:
162: SQL_Driver_create_func create=(SQL_Driver_create_func)lt_dlsym(handle,
163: SQL_DRIVER_CREATE_NAME);
164: if(!create)
1.62 paf 165: throw Exception(0,
1.54 paf 166: library,
167: "function '"SQL_DRIVER_CREATE_NAME"' was not found");
168:
169: // create library-driver!
170: driver=(*create)();
171:
172: // validate driver api version
173: int driver_api_version=driver->api_version();
174: if(driver_api_version!=SQL_DRIVER_API_VERSION)
1.62 paf 175: throw Exception(0,
1.54 paf 176: library,
177: "driver implements API version 0x%04X not equal to 0x%04X",
178: driver_api_version, SQL_DRIVER_API_VERSION);
179:
180: // initialise by connecting to sql client dynamic link library
1.71 paf 181: char* dlopen_file_spec_cstr=
182: dlopen_file_spec && dlopen_file_spec->length()?
183: dlopen_file_spec->cstrm(String::L_AS_IS):0;
184: if(const char* error=driver->initialize(dlopen_file_spec_cstr))
1.62 paf 185: throw Exception(0,
1.54 paf 186: library,
187: "driver failed to initialize client library '%s', %s",
1.71 paf 188: dlopen_file_spec_cstr?dlopen_file_spec_cstr:"unspecifed",
1.54 paf 189: error);
190:
191: // cache it
1.71 paf 192: put_driver_to_cache(protocol, driver);
1.54 paf 193: }
194:
1.80 ! paf 195: connection=new SQL_Connection(aurl, *driver, arequest_charset);
1.71 paf 196: // associate with pool[request] (deassociates at close)
197: connection->set_url();
1.54 paf 198: }
199:
1.58 paf 200: // if not connected yet, do that now, when connection has services
201: if(!connection->connected())
1.71 paf 202: connection->connect(url_cstr);
1.58 paf 203: // return autoclosing object for it
1.71 paf 204: return connection;
1.54 paf 205: }
206:
1.71 paf 207: void SQL_Driver_manager::close_connection(connection_cache_type::key_type url,
208: SQL_Connection* connection) {
1.54 paf 209: put_connection_to_cache(url, connection);
210: }
211:
212:
213: // driver cache
214:
1.71 paf 215: SQL_Driver *SQL_Driver_manager::get_driver_from_cache(driver_cache_type::key_type protocol) {
1.54 paf 216: SYNCHRONIZED;
217:
1.71 paf 218: return driver_cache.get(protocol);
1.54 paf 219: }
220:
1.71 paf 221: void SQL_Driver_manager::put_driver_to_cache(
222: driver_cache_type::key_type protocol,
223: driver_cache_type::value_type driver) {
1.54 paf 224: SYNCHRONIZED;
225:
1.71 paf 226: driver_cache.put(protocol, driver);
1.54 paf 227: }
228:
229: // connection cache
230: /// @todo get rid of memory spending Stack [zeros deep inside got accumulated]
1.71 paf 231: SQL_Connection* SQL_Driver_manager::get_connection_from_cache(connection_cache_type::key_type url) {
1.54 paf 232: SYNCHRONIZED;
233:
1.71 paf 234: if(connection_cache_type::value_type connections=connection_cache.get(url))
235: while(!connections->is_empty()) { // there are cached connections to that 'url'
236: SQL_Connection* result=connections->pop();
1.54 paf 237: if(result->connected()) // not expired?
238: return result;
239: }
240:
241: return 0;
242: }
243:
1.71 paf 244: void SQL_Driver_manager::put_connection_to_cache(
245: connection_cache_type::key_type url,
246: SQL_Connection* connection) {
1.54 paf 247: SYNCHRONIZED;
248:
1.71 paf 249: connection_cache_type::value_type connections=connection_cache.get(url);
1.54 paf 250: if(!connections) { // there are no cached connections to that 'url' yet?
1.71 paf 251: connections=new connection_cache_element_base_type;
1.54 paf 252: connection_cache.put(url, connections);
253: }
1.71 paf 254: connections->push(connection);
1.54 paf 255: }
256:
257: void SQL_Driver_manager::maybe_expire_cache() {
258: time_t now=time(0);
259:
260: if(prev_expiration_pass_time<now-CHECK_EXPIRED_CONNECTIONS_SECONDS) {
1.71 paf 261: connection_cache.for_each(expire_connections, time_t(now-EXPIRE_UNUSED_CONNECTION_SECONDS));
1.54 paf 262:
263: prev_expiration_pass_time=now;
264: }
265: }
266:
1.76 paf 267: static void add_connection_to_status_cache_table(SQL_Connection& connection, Table* table) {
1.54 paf 268: if(connection.connected()) {
1.76 paf 269: ArrayString& row=*new ArrayString;
1.54 paf 270:
271: // url
1.76 paf 272: row+=&connection.services().url_without_login();
1.54 paf 273: // time
1.58 paf 274: time_t time_used=connection.get_time_used();
1.76 paf 275: row+=new String(pa_strdup(ctime(&time_used)));
1.54 paf 276:
1.76 paf 277: *table+=&row;
1.54 paf 278: }
279: }
1.76 paf 280: static void add_connections_to_status_cache_table(
281: SQL_Driver_manager::connection_cache_type::key_type /*key*/,
282: SQL_Driver_manager::connection_cache_type::value_type stack, Table* table)
283: {
1.77 paf 284: for(Array_iterator<SQL_Connection*> i(*stack); i.has_next(); )
285: add_connection_to_status_cache_table(*i.next(), table);
1.76 paf 286: }
287:
1.71 paf 288: Value* SQL_Driver_manager::get_status() {
289: Value* result=new VHash;
1.76 paf 290:
1.54 paf 291: // cache
292: {
1.76 paf 293: ArrayString& columns=*new ArrayString;
1.71 paf 294: columns+=new String("url");
295: columns+=new String("time");
1.76 paf 296: Table& table=*new Table(&columns, connection_cache.count());
1.54 paf 297:
298: connection_cache.for_each(add_connections_to_status_cache_table, &table);
299:
1.76 paf 300: result->get_hash()->put(*new String("cache"), new VTable(&table));
301: }
1.54 paf 302:
303: return result;
1.57 paf 304: }
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