Annotation of parser3/src/main/pa_sql_driver_manager.C, revision 1.88
1.54 paf 1: /** @file
2: Parser: sql driver manager implementation.
3:
1.85 paf 4: Copyright (c) 2001-2005 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:
1.88 ! misha 8: static const char * const IDENT_SQL_DRIVER_MANAGER_C="$Date: 2007/04/23 10:30:32 $";
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:
1.84 paf 35: size_t at_pos=0;
36: size_t new_at_pos;
37: while( (new_at_pos=furl->pos('@', at_pos+1))!=STRING_NOT_FOUND)
38: at_pos=new_at_pos;
39: if(at_pos)
1.71 paf 40: result << furl->mid(at_pos, furl->length());
1.54 paf 41:
42: return result;
43: }
44:
1.80 paf 45: void SQL_Driver_services_impl::transcode(const char* src, size_t src_length,
46: const char*& dst, size_t& dst_length,
47: const char* charset_from_name,
48: const char* charset_to_name
49: )
50: {
51: try {
1.83 paf 52: // to speed up sql transcode [lots of charsets::get-s -- twice for each cell]
53: // without complicating sql driver API
54: // we need to cache couple of name->charset pairs
55: // assuming pointers to names are are NOT to local vars
56:
57: struct cache_record {
58: const char* name;
59: Charset* object;
60: } cache[2]={{0,0}, {0,0}};
61:
62: Charset* charset_from_object;
63: Charset* charset_to_object;
64: if(charset_from_name==cache[0].name) {
65: charset_from_object=cache[0].object;
66: } else {
67: cache[0].name=charset_from_name;
68: cache[0].object=charset_from_object=&charsets.get(charset_from_name);
69: }
70: if(charset_to_name==cache[1].name) {
71: charset_to_object=cache[1].object;
72: } else {
73: cache[1].name=charset_to_name;
74: cache[1].object=charset_to_object=&charsets.get(charset_to_name);
75: }
76:
1.80 paf 77: String::C result=Charset::transcode(String::C(src, src_length),
1.83 paf 78: *charset_from_object,
79: *charset_to_object);
1.80 paf 80: dst=result.str;
81: dst_length=result.length;
82: } catch(const Exception& e) {
83: _throw(SQL_Error(e.type(), e.comment()));
84: } catch(...) {
85: _throw(SQL_Error(0, "unknown error while transcoding in sql driver"));
86: }
87: }
88:
1.54 paf 89: // helpers
90:
1.71 paf 91: static void expire_connection(SQL_Connection& connection, time_t older_dies) {
1.54 paf 92: if(connection.connected() && connection.expired(older_dies))
93: connection.disconnect();
94: }
1.71 paf 95: static void expire_connections(SQL_Driver_manager::connection_cache_type::key_type /*key*/,
96: SQL_Driver_manager::connection_cache_type::value_type stack,
97: time_t older_dies) {
1.73 paf 98: for(size_t i=0; i<stack->top_index(); i++)
1.71 paf 99: expire_connection(*stack->get(i), older_dies);
1.54 paf 100: }
101:
102: // SQL_Driver_manager
103:
1.71 paf 104: SQL_Driver_manager::SQL_Driver_manager():
1.75 paf 105: is_dlinited(false), prev_expiration_pass_time(0) {
1.54 paf 106: }
107:
108: SQL_Driver_manager::~SQL_Driver_manager() {
1.86 paf 109: connection_cache.for_each<time_t>(expire_connections, time(0)+(time_t)10/*=in future=expire all*/);
1.71 paf 110:
111: if(is_dlinited)
112: lt_dlexit();
1.54 paf 113: }
114:
1.71 paf 115: /// @param aurl protocol://[driver-dependent]
116: SQL_Connection* SQL_Driver_manager::get_connection(const String& aurl,
1.80 paf 117: Table *protocol2driver_and_client,
1.88 ! misha 118: const char* arequest_charset,
! 119: const char* adocument_root) {
1.54 paf 120: // we have table for locating protocol's library
121: if(!protocol2driver_and_client)
1.87 misha 122: throw Exception(PARSER_RUNTIME,
1.71 paf 123: &aurl,
1.54 paf 124: "$"MAIN_SQL_NAME":"MAIN_SQL_DRIVERS_NAME" table must be defined");
125:
126: // first trying to get cached connection
1.71 paf 127: SQL_Connection* connection=get_connection_from_cache(aurl);
1.58 paf 128: if(connection) {
1.71 paf 129: connection->set_url();
1.58 paf 130: if(!connection->ping()) { // we have some cached connection, is it pingable?
131: connection->disconnect(); // kill unpingabe=dead connection
132: connection=0;
1.54 paf 133: }
134: }
135:
1.71 paf 136: char *url_cstr;
1.58 paf 137: if(connection)
1.71 paf 138: url_cstr=0; // calm, compiler
1.54 paf 139: else { // no cached connection or it were unpingabe: connect/reconnect
1.71 paf 140: url_cstr=aurl.cstrm();
141: if(!strstr(url_cstr, "://"))
1.87 misha 142: throw Exception(PARSER_RUNTIME,
1.71 paf 143: aurl.length()?&aurl:0,
1.62 paf 144: "connection string must start with protocol://");
1.54 paf 145:
1.71 paf 146:
147: char *protocol_cstr=lsplit(&url_cstr, ':');
1.54 paf 148: // skip "//" after ':'
1.71 paf 149: while(*url_cstr=='/')
150: url_cstr++;
151: const String& protocol=*new String(protocol_cstr);
1.54 paf 152:
153: SQL_Driver *driver;
154: // first trying to get cached driver
1.71 paf 155: if(!(driver=get_driver_from_cache(protocol))) {
1.54 paf 156: // no cached
1.71 paf 157: const String* library=0;
158: const String* dlopen_file_spec=0;
1.70 paf 159: Table::Action_options options;
1.71 paf 160: if(protocol2driver_and_client->locate(0, protocol, options)) {
161: if(!(library=protocol2driver_and_client->item(1)) || library->length()==0)
1.87 misha 162: throw Exception(PARSER_RUNTIME,
1.71 paf 163: 0,
1.54 paf 164: "driver library column for protocol '%s' is empty",
1.71 paf 165: protocol_cstr);
1.54 paf 166: dlopen_file_spec=protocol2driver_and_client->item(2);
167: } else
1.87 misha 168: throw Exception(PARSER_RUNTIME,
1.71 paf 169: &aurl,
1.54 paf 170: "undefined protocol '%s'",
1.71 paf 171: protocol_cstr);
172:
173: if(!is_dlinited) {
174: if(lt_dlinit())
175: throw Exception(0,
176: library,
177: "prepare to dynamic loading failed, %s", lt_dlerror());
1.54 paf 178:
1.71 paf 179: is_dlinited=true;
180: }
1.54 paf 181:
1.71 paf 182: const char* filename=library->cstr(String::L_FILE_SPEC);
1.54 paf 183: lt_dlhandle handle=lt_dlopen(filename);
1.79 paf 184: if (!handle) {
185: const char* error=lt_dlerror();
1.62 paf 186: throw Exception(0,
1.54 paf 187: library,
1.79 paf 188: error?error:"can not open the module");
189: }
1.54 paf 190:
1.86 paf 191: SQL_Driver_create_func create=(SQL_Driver_create_func)(lt_dlsym(handle,
192: SQL_DRIVER_CREATE_NAME));
1.54 paf 193: if(!create)
1.62 paf 194: throw Exception(0,
1.54 paf 195: library,
196: "function '"SQL_DRIVER_CREATE_NAME"' was not found");
197:
198: // create library-driver!
199: driver=(*create)();
200:
201: // validate driver api version
202: int driver_api_version=driver->api_version();
203: if(driver_api_version!=SQL_DRIVER_API_VERSION)
1.62 paf 204: throw Exception(0,
1.54 paf 205: library,
206: "driver implements API version 0x%04X not equal to 0x%04X",
207: driver_api_version, SQL_DRIVER_API_VERSION);
208:
209: // initialise by connecting to sql client dynamic link library
1.71 paf 210: char* dlopen_file_spec_cstr=
211: dlopen_file_spec && dlopen_file_spec->length()?
212: dlopen_file_spec->cstrm(String::L_AS_IS):0;
213: if(const char* error=driver->initialize(dlopen_file_spec_cstr))
1.62 paf 214: throw Exception(0,
1.54 paf 215: library,
216: "driver failed to initialize client library '%s', %s",
1.71 paf 217: dlopen_file_spec_cstr?dlopen_file_spec_cstr:"unspecifed",
1.54 paf 218: error);
219:
220: // cache it
1.71 paf 221: put_driver_to_cache(protocol, driver);
1.54 paf 222: }
223:
1.88 ! misha 224: connection=new SQL_Connection(aurl, *driver, arequest_charset, adocument_root);
1.71 paf 225: // associate with pool[request] (deassociates at close)
226: connection->set_url();
1.54 paf 227: }
228:
1.58 paf 229: // if not connected yet, do that now, when connection has services
230: if(!connection->connected())
1.71 paf 231: connection->connect(url_cstr);
1.58 paf 232: // return autoclosing object for it
1.71 paf 233: return connection;
1.54 paf 234: }
235:
1.71 paf 236: void SQL_Driver_manager::close_connection(connection_cache_type::key_type url,
237: SQL_Connection* connection) {
1.54 paf 238: put_connection_to_cache(url, connection);
239: }
240:
241:
242: // driver cache
243:
1.71 paf 244: SQL_Driver *SQL_Driver_manager::get_driver_from_cache(driver_cache_type::key_type protocol) {
1.54 paf 245: SYNCHRONIZED;
246:
1.71 paf 247: return driver_cache.get(protocol);
1.54 paf 248: }
249:
1.71 paf 250: void SQL_Driver_manager::put_driver_to_cache(
251: driver_cache_type::key_type protocol,
252: driver_cache_type::value_type driver) {
1.54 paf 253: SYNCHRONIZED;
254:
1.71 paf 255: driver_cache.put(protocol, driver);
1.54 paf 256: }
257:
258: // connection cache
259: /// @todo get rid of memory spending Stack [zeros deep inside got accumulated]
1.71 paf 260: SQL_Connection* SQL_Driver_manager::get_connection_from_cache(connection_cache_type::key_type url) {
1.54 paf 261: SYNCHRONIZED;
262:
1.71 paf 263: if(connection_cache_type::value_type connections=connection_cache.get(url))
264: while(!connections->is_empty()) { // there are cached connections to that 'url'
265: SQL_Connection* result=connections->pop();
1.54 paf 266: if(result->connected()) // not expired?
267: return result;
268: }
269:
270: return 0;
271: }
272:
1.71 paf 273: void SQL_Driver_manager::put_connection_to_cache(
274: connection_cache_type::key_type url,
275: SQL_Connection* connection) {
1.54 paf 276: SYNCHRONIZED;
277:
1.71 paf 278: connection_cache_type::value_type connections=connection_cache.get(url);
1.54 paf 279: if(!connections) { // there are no cached connections to that 'url' yet?
1.71 paf 280: connections=new connection_cache_element_base_type;
1.54 paf 281: connection_cache.put(url, connections);
282: }
1.71 paf 283: connections->push(connection);
1.54 paf 284: }
285:
286: void SQL_Driver_manager::maybe_expire_cache() {
287: time_t now=time(0);
288:
289: if(prev_expiration_pass_time<now-CHECK_EXPIRED_CONNECTIONS_SECONDS) {
1.86 paf 290: connection_cache.for_each<time_t>(expire_connections, time_t(now-EXPIRE_UNUSED_CONNECTION_SECONDS));
1.54 paf 291:
292: prev_expiration_pass_time=now;
293: }
294: }
295:
1.76 paf 296: static void add_connection_to_status_cache_table(SQL_Connection& connection, Table* table) {
1.54 paf 297: if(connection.connected()) {
1.76 paf 298: ArrayString& row=*new ArrayString;
1.54 paf 299:
300: // url
1.76 paf 301: row+=&connection.services().url_without_login();
1.54 paf 302: // time
1.58 paf 303: time_t time_used=connection.get_time_used();
1.76 paf 304: row+=new String(pa_strdup(ctime(&time_used)));
1.54 paf 305:
1.76 paf 306: *table+=&row;
1.54 paf 307: }
308: }
1.76 paf 309: static void add_connections_to_status_cache_table(
310: SQL_Driver_manager::connection_cache_type::key_type /*key*/,
311: SQL_Driver_manager::connection_cache_type::value_type stack, Table* table)
312: {
1.77 paf 313: for(Array_iterator<SQL_Connection*> i(*stack); i.has_next(); )
314: add_connection_to_status_cache_table(*i.next(), table);
1.76 paf 315: }
316:
1.71 paf 317: Value* SQL_Driver_manager::get_status() {
318: Value* result=new VHash;
1.76 paf 319:
1.54 paf 320: // cache
321: {
1.76 paf 322: ArrayString& columns=*new ArrayString;
1.71 paf 323: columns+=new String("url");
324: columns+=new String("time");
1.76 paf 325: Table& table=*new Table(&columns, connection_cache.count());
1.54 paf 326:
1.86 paf 327: connection_cache.for_each<Table*>(add_connections_to_status_cache_table, &table);
1.54 paf 328:
1.76 paf 329: result->get_hash()->put(*new String("cache"), new VTable(&table));
330: }
1.54 paf 331:
332: return result;
1.57 paf 333: }
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