Annotation of parser3/src/main/pa_sql_driver_manager.C, revision 1.49
1.29 parser 1: /** @file
2: Parser: sql driver manager implementation.
3:
4: Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com)
1.38 parser 5: Author: Alexander Petrosyan <paf@design.ru> (http://design.ru/paf)
1.29 parser 6:
1.49 ! paf 7: $Id: pa_sql_driver_manager.C,v 1.48 2001/10/31 14:58:10 paf Exp $
1.29 parser 8: */
9:
10: #include "pa_sql_driver_manager.h"
11: #include "ltdl.h"
12: #include "pa_sql_connection.h"
13: #include "pa_exception.h"
14: #include "pa_common.h"
15: #include "pa_threads.h"
1.42 parser 16: #include "pa_stack.h"
1.49 ! paf 17: #include "pa_vhash.h"
! 18: #include "pa_vtable.h"
1.29 parser 19:
20: // globals
21:
22: SQL_Driver_manager *SQL_driver_manager;
23:
24: // consts
25:
26: const int EXPIRE_UNUSED_CONNECTION_SECONDS=60;
1.30 parser 27: const int CHECK_EXPIRED_CONNECTIONS_SECONDS=EXPIRE_UNUSED_CONNECTION_SECONDS*2;
1.29 parser 28:
1.49 ! paf 29: // helpers
! 30:
! 31: const String& url_without_login(Pool& pool, const String& url) {
! 32: String& result=*new(pool) String(pool);
! 33: result << url.mid(0, url.pos(":")) << "://****";
! 34:
! 35: int at_pos=url.pos("@");
! 36: if(at_pos>0)
! 37: result << url.mid(at_pos, url.size());
! 38:
! 39: return result;
! 40: }
1.29 parser 41:
42: /// SQL_Driver_services Pooled implementation
43: class SQL_Driver_services_impl : public SQL_Driver_services, public Pooled {
44: public:
45: SQL_Driver_services_impl(Pool& apool, const String& aurl) : Pooled(apool),
46: furl(aurl) {
47: }
1.40 parser 48:
1.45 paf 49: virtual void *malloc(size_t size) { return Pooled::malloc(size, 8); }
1.43 paf 50: virtual void *calloc(size_t size) { return Pooled::calloc(size); }
51:
52: /**
53: the idea is to #1 jump to C++ some function to main body, where
54: every function stack frame has exception unwind information
55: and from there... #2 propagate_exception()
56: */
57: virtual void _throw(const char *comment) {
1.49 ! paf 58: // hiding passwords and addresses from accidental show [imagine user forgot @exception]
1.43 paf 59: e=Exception(0, 0,
1.49 ! paf 60: &url_without_login(pool(), furl),
1.29 parser 61: comment);
1.43 paf 62:
63: longjmp(mark, 1);
64: }
65: virtual void propagate_exception() {
66: throw e;
1.29 parser 67: }
68:
69: private:
70: const String& furl;
1.43 paf 71: Exception e;
1.29 parser 72: };
73:
1.42 parser 74: // helpers
75:
76: static void expire_connection(Array::Item *value, void *info) {
77: SQL_Connection& connection=*static_cast<SQL_Connection *>(value);
78: time_t older_dies=reinterpret_cast<time_t>(info);
79:
80: if(connection.connected() && connection.expired(older_dies))
81: connection.disconnect();
82: }
83: static void expire_connections(const Hash::Key& key, Hash::Val *value, void *info) {
84: Stack& stack=*static_cast<Stack *>(value);
85: for(int i=0; i<=stack.top_index(); i++)
86: expire_connection(stack.get(i), info);
87: }
88:
1.29 parser 89: // SQL_Driver_manager
90:
1.49 ! paf 91: SQL_Driver_manager::SQL_Driver_manager(Pool& apool) : Pooled(apool),
! 92: driver_cache(apool),
! 93: connection_cache(apool),
1.42 parser 94: prev_expiration_pass_time(0) {
1.49 ! paf 95:
! 96: status_providers->put(*NEW String(pool(), "sql"), this);
1.42 parser 97: }
98:
99: SQL_Driver_manager::~SQL_Driver_manager() {
100: connection_cache.for_each(expire_connections,
101: reinterpret_cast<void *>((time_t)0/*=in past=expire all*/));
102: }
103:
1.29 parser 104: /// @param request_url protocol://[driver-dependent]
1.36 parser 105: SQL_Connection& SQL_Driver_manager::get_connection(const String& request_url,
106: const String& request_origin,
1.29 parser 107: Table *protocol2driver_and_client) {
1.36 parser 108: Pool& pool=request_origin.pool(); // request pool
1.29 parser 109:
110: // we have table for locating protocol's library
111: if(!protocol2driver_and_client)
1.41 parser 112: throw Exception(0, 0,
1.29 parser 113: &request_url,
1.31 parser 114: "$"MAIN_SQL_NAME":"MAIN_SQL_DRIVERS_NAME" table must be defined");
1.29 parser 115:
1.44 paf 116: // construct services[request] (deassociates at close)
117: SQL_Driver_services *services=new(pool) SQL_Driver_services_impl(pool, request_url);
118:
1.29 parser 119: // first trying to get cached connection
120: SQL_Connection *result=get_connection_from_cache(request_url);
1.44 paf 121: if(result) {
122: result->set_services(services);
123: if(!result->ping()) { // we have some cached connection, is it pingable?
124: result->disconnect(); // kill unpingabe=dead connection
125: result=0;
126: }
1.29 parser 127: }
128:
129: char *request_url_cstr;
130: if(result)
131: request_url_cstr=0; // calm, compiler
132: else { // no cached connection or it were unpingabe: connect/reconnect
133: int pos=request_url.pos("://", 3);
134: if(pos<0)
1.41 parser 135: throw Exception(0, 0,
1.36 parser 136: request_url.size()?&request_url:&request_origin,
137: "connection string must start with protocol://"); // NOTE: not THROW, but PTHROW
1.29 parser 138:
139: // make global_url C-string on global pool
1.46 paf 140: request_url_cstr=request_url.cstr();
1.29 parser 141: char *global_url_cstr=(char *)malloc(strlen(request_url_cstr)+1);
142: strcpy(global_url_cstr, request_url_cstr);
143: // make global_url string on global pool
144: String& global_url=*new(this->pool()) String(this->pool(), global_url_cstr);
145:
146: char *request_protocol_cstr=lsplit(&request_url_cstr, ':');
147: // skip "//" after ':'
148: while(*request_url_cstr=='/')
149: request_url_cstr++;
150: // make global_protocol C-string on global pool
151: char *global_protocol_cstr=(char *)malloc(strlen(request_protocol_cstr)+1);
152: strcpy(global_protocol_cstr, request_protocol_cstr);
153: // make global_protocol string on global pool
154: String& global_protocol=*new(this->pool()) String(this->pool(),
155: global_protocol_cstr);
156:
157: SQL_Driver *driver;
158: const String *dlopen_file_spec=0;
159: // first trying to get cached driver
160: if(!(driver=get_driver_from_cache(global_protocol))) {
161: // no cached
162: const String *library=0;
163: if(protocol2driver_and_client->locate(0, global_protocol)) {
164: if(!(library=protocol2driver_and_client->item(1)) || library->size()==0)
1.41 parser 165: throw Exception(0, 0,
1.29 parser 166: protocol2driver_and_client->origin_string(),
167: "driver library column for protocol '%s' is empty",
168: request_protocol_cstr);
169: dlopen_file_spec=protocol2driver_and_client->item(2);
170: } else
1.41 parser 171: throw Exception(0, 0,
1.29 parser 172: &request_url,
173: "undefined protocol '%s'",
174: request_protocol_cstr);
175:
176: if(lt_dlinit())
1.41 parser 177: throw Exception(0, 0,
1.29 parser 178: library,
179: "prepare to dynamic loading failed, %s", lt_dlerror());
180:
1.34 parser 181: const char *filename=library->cstr(String::UL_FILE_SPEC);
1.29 parser 182: lt_dlhandle handle=lt_dlopen(filename);
183: if (!handle)
1.41 parser 184: throw Exception(0, 0,
1.29 parser 185: library,
186: "can not open the module, %s", lt_dlerror());
187:
188: SQL_Driver_create_func create=(SQL_Driver_create_func)lt_dlsym(handle,
1.33 parser 189: SQL_DRIVER_CREATE_NAME);
1.29 parser 190: if(!create)
1.41 parser 191: throw Exception(0, 0,
1.29 parser 192: library,
1.33 parser 193: "function '"SQL_DRIVER_CREATE_NAME"' was not found");
1.29 parser 194:
195: // create library-driver!
196: driver=(*create)();
197:
198: // validate driver api version
199: int driver_api_version=driver->api_version();
200: if(driver_api_version!=SQL_DRIVER_API_VERSION)
1.41 parser 201: throw Exception(0, 0,
1.29 parser 202: library,
203: "driver implements API version 0x%04X not equal to 0x%04X",
204: driver_api_version, SQL_DRIVER_API_VERSION);
205:
206: // initialise by connecting to sql client dynamic link library
207: bool specified_dlopen_file_spec=dlopen_file_spec && dlopen_file_spec->size();
208: const char *dlopen_file_spec_cstr=
209: specified_dlopen_file_spec?
1.34 parser 210: dlopen_file_spec->cstr(String::UL_FILE_SPEC):0;
1.29 parser 211: if(const char *error=driver->initialize(
212: dlopen_file_spec_cstr))
1.41 parser 213: throw Exception(0, 0,
1.29 parser 214: library,
215: "driver failed to initialize client library '%s', %s",
216: specified_dlopen_file_spec?dlopen_file_spec_cstr:"unspecifed",
217: error);
218:
219: // cache it
220: put_driver_to_cache(global_protocol, *driver);
221: }
222:
223: // allocate in global pool
224: // associate with services[request]
225: // NOTE: never freed up!
226: result=new(this->pool()) SQL_Connection(this->pool(), global_url, *driver);
1.44 paf 227: // associate with services[request] (deassociates at close)
228: result->set_services(services);
1.29 parser 229: }
230:
231: // if not connected yet, do that now, when result has services
232: if(!result->connected())
233: result->connect(request_url_cstr);
234: // return it
235: return *result;
236: }
237:
238: void SQL_Driver_manager::close_connection(const String& url,
239: SQL_Connection& connection) {
240: // deassociate from services[request]
241: connection.set_services(0);
242: put_connection_to_cache(url, connection);
243: }
244:
245:
246: // driver cache
247:
248: SQL_Driver *SQL_Driver_manager::get_driver_from_cache(const String& protocol) {
249: SYNCHRONIZED;
250:
251: return static_cast<SQL_Driver *>(driver_cache.get(protocol));
252: }
253:
254: void SQL_Driver_manager::put_driver_to_cache(const String& protocol,
255: SQL_Driver& driver) {
256: SYNCHRONIZED;
257:
258: driver_cache.put(protocol, &driver);
259: }
260:
261: // connection cache
262: /// @todo get rid of memory spending Stack [zeros deep inside got accumulated]
263: SQL_Connection *SQL_Driver_manager::get_connection_from_cache(const String& url) {
264: SYNCHRONIZED;
265:
266: maybe_expire_connection_cache();
267:
268: if(Stack *connections=static_cast<Stack *>(connection_cache.get(url)))
269: while(connections->top_index()>=0) { // there are cached connections to that 'url'
270: SQL_Connection *result=static_cast<SQL_Connection *>(connections->pop());
271: if(result->connected()) // not expired?
272: return result;
273: }
274:
275: return 0;
276: }
277:
278: void SQL_Driver_manager::put_connection_to_cache(const String& url,
279: SQL_Connection& connection) {
280: SYNCHRONIZED;
281:
282: Stack *connections=static_cast<Stack *>(connection_cache.get(url));
283: if(!connections) { // there are no cached connections to that 'url' yet?
284: connections=NEW Stack(pool()); // NOTE: never freed up!
285: connection_cache.put(url, connections);
286: }
287: connections->push(&connection);
288: }
289:
290: void SQL_Driver_manager::maybe_expire_connection_cache() {
291: time_t now=time(0);
292:
293: if(prev_expiration_pass_time<now-CHECK_EXPIRED_CONNECTIONS_SECONDS) {
294: connection_cache.for_each(expire_connections,
295: reinterpret_cast<void *>(now-EXPIRE_UNUSED_CONNECTION_SECONDS));
296:
297: prev_expiration_pass_time=now;
298: }
299: }
1.49 ! paf 300:
! 301: static void add_connection_to_status_cache_table(Array::Item *value, void *info) {
! 302: SQL_Connection& connection=*static_cast<SQL_Connection *>(value);
! 303: Table& table=*static_cast<Table *>(info);
! 304:
! 305: if(connection.connected()) {
! 306: Pool& pool=table.pool();
! 307: Array& row=*new(pool) Array(pool, 3);
! 308:
! 309: row+=&url_without_login(pool, connection.get_url());
! 310: time_t time_stamp=connection.get_time_stamp();
! 311: const char *unsafe_time_cstr=ctime(&time_stamp);
! 312: int time_buf_size=strlen(unsafe_time_cstr);
! 313: char *safe_time_buf=(char *)pool.malloc(time_buf_size);
! 314: memcpy(safe_time_buf, unsafe_time_cstr, time_buf_size);
! 315: row+=new(pool) String(pool, safe_time_buf, time_buf_size);
! 316:
! 317: table+=&row;
! 318: }
! 319: }
! 320: static void add_connections_to_status_cache_table(const Hash::Key& key, Hash::Val *value, void *info) {
! 321: Stack& stack=*static_cast<Stack *>(value);
! 322: Array_iter iter(stack);
! 323: for(int countdown=stack.top_index(); countdown-->=0; )
! 324: add_connection_to_status_cache_table(iter.next(), info);
! 325: }
! 326:
! 327:
! 328: Value& SQL_Driver_manager::get_status(Pool& pool, const String *source) {
! 329: VHash& result=*new(pool) VHash(pool);
! 330:
! 331: // cache
! 332: {
! 333: Array& columns=*new(pool) Array(pool, 3);
! 334: columns+=new(pool) String(pool, "url");
! 335: columns+=new(pool) String(pool, "time");
! 336: Table& table=*new(pool) Table(pool, 0, &columns, connection_cache.size());
! 337:
! 338: connection_cache.for_each(add_connections_to_status_cache_table, &table);
! 339:
! 340: result.hash(source).put(*new(pool) String(pool, "cache"), new(pool) VTable(pool, &table));
! 341: }
! 342:
! 343: return result;
! 344: }
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