Annotation of parser3/src/main/pa_sql_driver_manager.C, revision 1.86
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:
1.86 ! paf 8: static const char * const IDENT_SQL_DRIVER_MANAGER_C="$Date: 2006/04/09 12:25:04 $";
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,
118: const char* arequest_charset) {
1.54 paf 119: // we have table for locating protocol's library
120: if(!protocol2driver_and_client)
1.62 paf 121: throw Exception("parser.runtime",
1.71 paf 122: &aurl,
1.54 paf 123: "$"MAIN_SQL_NAME":"MAIN_SQL_DRIVERS_NAME" table must be defined");
124:
125: // first trying to get cached connection
1.71 paf 126: SQL_Connection* connection=get_connection_from_cache(aurl);
1.58 paf 127: if(connection) {
1.71 paf 128: connection->set_url();
1.58 paf 129: if(!connection->ping()) { // we have some cached connection, is it pingable?
130: connection->disconnect(); // kill unpingabe=dead connection
131: connection=0;
1.54 paf 132: }
133: }
134:
1.71 paf 135: char *url_cstr;
1.58 paf 136: if(connection)
1.71 paf 137: url_cstr=0; // calm, compiler
1.54 paf 138: else { // no cached connection or it were unpingabe: connect/reconnect
1.71 paf 139: url_cstr=aurl.cstrm();
140: if(!strstr(url_cstr, "://"))
1.62 paf 141: throw Exception("parser.runtime",
1.71 paf 142: aurl.length()?&aurl:0,
1.62 paf 143: "connection string must start with protocol://");
1.54 paf 144:
1.71 paf 145:
146: char *protocol_cstr=lsplit(&url_cstr, ':');
1.54 paf 147: // skip "//" after ':'
1.71 paf 148: while(*url_cstr=='/')
149: url_cstr++;
150: const String& protocol=*new String(protocol_cstr);
1.54 paf 151:
152: SQL_Driver *driver;
153: // first trying to get cached driver
1.71 paf 154: if(!(driver=get_driver_from_cache(protocol))) {
1.54 paf 155: // no cached
1.71 paf 156: const String* library=0;
157: const String* dlopen_file_spec=0;
1.70 paf 158: Table::Action_options options;
1.71 paf 159: if(protocol2driver_and_client->locate(0, protocol, options)) {
160: if(!(library=protocol2driver_and_client->item(1)) || library->length()==0)
1.62 paf 161: throw Exception("parser.runtime",
1.71 paf 162: 0,
1.54 paf 163: "driver library column for protocol '%s' is empty",
1.71 paf 164: protocol_cstr);
1.54 paf 165: dlopen_file_spec=protocol2driver_and_client->item(2);
166: } else
1.62 paf 167: throw Exception("parser.runtime",
1.71 paf 168: &aurl,
1.54 paf 169: "undefined protocol '%s'",
1.71 paf 170: protocol_cstr);
171:
172: if(!is_dlinited) {
173: if(lt_dlinit())
174: throw Exception(0,
175: library,
176: "prepare to dynamic loading failed, %s", lt_dlerror());
1.54 paf 177:
1.71 paf 178: is_dlinited=true;
179: }
1.54 paf 180:
1.71 paf 181: const char* filename=library->cstr(String::L_FILE_SPEC);
1.54 paf 182: lt_dlhandle handle=lt_dlopen(filename);
1.79 paf 183: if (!handle) {
184: const char* error=lt_dlerror();
1.62 paf 185: throw Exception(0,
1.54 paf 186: library,
1.79 paf 187: error?error:"can not open the module");
188: }
1.54 paf 189:
1.86 ! paf 190: SQL_Driver_create_func create=(SQL_Driver_create_func)(lt_dlsym(handle,
! 191: SQL_DRIVER_CREATE_NAME));
1.54 paf 192: if(!create)
1.62 paf 193: throw Exception(0,
1.54 paf 194: library,
195: "function '"SQL_DRIVER_CREATE_NAME"' was not found");
196:
197: // create library-driver!
198: driver=(*create)();
199:
200: // validate driver api version
201: int driver_api_version=driver->api_version();
202: if(driver_api_version!=SQL_DRIVER_API_VERSION)
1.62 paf 203: throw Exception(0,
1.54 paf 204: library,
205: "driver implements API version 0x%04X not equal to 0x%04X",
206: driver_api_version, SQL_DRIVER_API_VERSION);
207:
208: // initialise by connecting to sql client dynamic link library
1.71 paf 209: char* dlopen_file_spec_cstr=
210: dlopen_file_spec && dlopen_file_spec->length()?
211: dlopen_file_spec->cstrm(String::L_AS_IS):0;
212: if(const char* error=driver->initialize(dlopen_file_spec_cstr))
1.62 paf 213: throw Exception(0,
1.54 paf 214: library,
215: "driver failed to initialize client library '%s', %s",
1.71 paf 216: dlopen_file_spec_cstr?dlopen_file_spec_cstr:"unspecifed",
1.54 paf 217: error);
218:
219: // cache it
1.71 paf 220: put_driver_to_cache(protocol, driver);
1.54 paf 221: }
222:
1.80 paf 223: connection=new SQL_Connection(aurl, *driver, arequest_charset);
1.71 paf 224: // associate with pool[request] (deassociates at close)
225: connection->set_url();
1.54 paf 226: }
227:
1.58 paf 228: // if not connected yet, do that now, when connection has services
229: if(!connection->connected())
1.71 paf 230: connection->connect(url_cstr);
1.58 paf 231: // return autoclosing object for it
1.71 paf 232: return connection;
1.54 paf 233: }
234:
1.71 paf 235: void SQL_Driver_manager::close_connection(connection_cache_type::key_type url,
236: SQL_Connection* connection) {
1.54 paf 237: put_connection_to_cache(url, connection);
238: }
239:
240:
241: // driver cache
242:
1.71 paf 243: SQL_Driver *SQL_Driver_manager::get_driver_from_cache(driver_cache_type::key_type protocol) {
1.54 paf 244: SYNCHRONIZED;
245:
1.71 paf 246: return driver_cache.get(protocol);
1.54 paf 247: }
248:
1.71 paf 249: void SQL_Driver_manager::put_driver_to_cache(
250: driver_cache_type::key_type protocol,
251: driver_cache_type::value_type driver) {
1.54 paf 252: SYNCHRONIZED;
253:
1.71 paf 254: driver_cache.put(protocol, driver);
1.54 paf 255: }
256:
257: // connection cache
258: /// @todo get rid of memory spending Stack [zeros deep inside got accumulated]
1.71 paf 259: SQL_Connection* SQL_Driver_manager::get_connection_from_cache(connection_cache_type::key_type url) {
1.54 paf 260: SYNCHRONIZED;
261:
1.71 paf 262: if(connection_cache_type::value_type connections=connection_cache.get(url))
263: while(!connections->is_empty()) { // there are cached connections to that 'url'
264: SQL_Connection* result=connections->pop();
1.54 paf 265: if(result->connected()) // not expired?
266: return result;
267: }
268:
269: return 0;
270: }
271:
1.71 paf 272: void SQL_Driver_manager::put_connection_to_cache(
273: connection_cache_type::key_type url,
274: SQL_Connection* connection) {
1.54 paf 275: SYNCHRONIZED;
276:
1.71 paf 277: connection_cache_type::value_type connections=connection_cache.get(url);
1.54 paf 278: if(!connections) { // there are no cached connections to that 'url' yet?
1.71 paf 279: connections=new connection_cache_element_base_type;
1.54 paf 280: connection_cache.put(url, connections);
281: }
1.71 paf 282: connections->push(connection);
1.54 paf 283: }
284:
285: void SQL_Driver_manager::maybe_expire_cache() {
286: time_t now=time(0);
287:
288: if(prev_expiration_pass_time<now-CHECK_EXPIRED_CONNECTIONS_SECONDS) {
1.86 ! paf 289: connection_cache.for_each<time_t>(expire_connections, time_t(now-EXPIRE_UNUSED_CONNECTION_SECONDS));
1.54 paf 290:
291: prev_expiration_pass_time=now;
292: }
293: }
294:
1.76 paf 295: static void add_connection_to_status_cache_table(SQL_Connection& connection, Table* table) {
1.54 paf 296: if(connection.connected()) {
1.76 paf 297: ArrayString& row=*new ArrayString;
1.54 paf 298:
299: // url
1.76 paf 300: row+=&connection.services().url_without_login();
1.54 paf 301: // time
1.58 paf 302: time_t time_used=connection.get_time_used();
1.76 paf 303: row+=new String(pa_strdup(ctime(&time_used)));
1.54 paf 304:
1.76 paf 305: *table+=&row;
1.54 paf 306: }
307: }
1.76 paf 308: static void add_connections_to_status_cache_table(
309: SQL_Driver_manager::connection_cache_type::key_type /*key*/,
310: SQL_Driver_manager::connection_cache_type::value_type stack, Table* table)
311: {
1.77 paf 312: for(Array_iterator<SQL_Connection*> i(*stack); i.has_next(); )
313: add_connection_to_status_cache_table(*i.next(), table);
1.76 paf 314: }
315:
1.71 paf 316: Value* SQL_Driver_manager::get_status() {
317: Value* result=new VHash;
1.76 paf 318:
1.54 paf 319: // cache
320: {
1.76 paf 321: ArrayString& columns=*new ArrayString;
1.71 paf 322: columns+=new String("url");
323: columns+=new String("time");
1.76 paf 324: Table& table=*new Table(&columns, connection_cache.count());
1.54 paf 325:
1.86 ! paf 326: connection_cache.for_each<Table*>(add_connections_to_status_cache_table, &table);
1.54 paf 327:
1.76 paf 328: result->get_hash()->put(*new String("cache"), new VTable(&table));
329: }
1.54 paf 330:
331: return result;
1.57 paf 332: }
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