Annotation of parser3/src/main/pa_sql_driver_manager.C, revision 1.105
1.54 paf 1: /** @file
2: Parser: sql driver manager implementation.
3:
1.105 ! moko 4: Copyright (c) 2001-2024 Art. Lebedev Studio (http://www.artlebedev.com)
1.102 moko 5: Authors: Konstantin Morshnev <moko@design.ru>, Alexandr Petrosian <paf@design.ru>
1.63 paf 6: */
1.54 paf 7:
8: #include "pa_sql_driver_manager.h"
9: #include "ltdl.h"
1.71 paf 10: #include "pa_threads.h"
1.54 paf 11: #include "pa_sql_connection.h"
12: #include "pa_exception.h"
13: #include "pa_common.h"
14: #include "pa_vhash.h"
15: #include "pa_vtable.h"
1.80 paf 16: #include "pa_charsets.h"
1.54 paf 17:
1.105 ! moko 18: volatile const char * IDENT_PA_SQL_DRIVER_MANAGER_C="$Id: pa_sql_driver_manager.C,v 1.104 2024/09/28 14:37:54 moko Exp $" IDENT_PA_SQL_DRIVER_MANAGER_H IDENT_PA_SQL_CONNECTION_H;
1.91 moko 19:
1.54 paf 20: // globals
21:
1.78 paf 22: SQL_Driver_manager* SQL_driver_manager=0;
1.54 paf 23:
24: // consts
25:
1.100 moko 26: const time_t EXPIRE_UNUSED_CONNECTION_SECONDS=10;
1.71 paf 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;
1.96 moko 68: cache[0].object=charset_from_object=&pa_charsets.get_direct(charset_from_name);
1.83 paf 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;
1.96 moko 74: cache[1].object=charset_to_object=&pa_charsets.get_direct(charset_to_name);
1.83 paf 75: }
76:
1.95 moko 77: String::C result=Charset::transcode(String::C(src, src_length), *charset_from_object, *charset_to_object);
1.80 paf 78: dst=result.str;
79: dst_length=result.length;
80: } catch(const Exception& e) {
81: _throw(SQL_Error(e.type(), e.comment()));
82: } catch(...) {
1.98 moko 83: _throw(SQL_Error("unknown error while transcoding in sql driver"));
1.80 paf 84: }
85: }
86:
1.54 paf 87: // helpers
88:
1.71 paf 89: static void expire_connection(SQL_Connection& connection, time_t older_dies) {
1.54 paf 90: if(connection.connected() && connection.expired(older_dies))
91: connection.disconnect();
92: }
1.99 moko 93: static void expire_connections(SQL_Driver_manager::connection_cache_type::key_type /*key*/, SQL_Driver_manager::connection_cache_type::value_type stack, time_t older_dies) {
1.73 paf 94: for(size_t i=0; i<stack->top_index(); i++)
1.71 paf 95: expire_connection(*stack->get(i), older_dies);
1.54 paf 96: }
97:
98: // SQL_Driver_manager
99:
1.92 moko 100: SQL_Driver_manager::SQL_Driver_manager(): prev_expiration_pass_time(0) {}
1.54 paf 101:
102: SQL_Driver_manager::~SQL_Driver_manager() {
1.86 paf 103: connection_cache.for_each<time_t>(expire_connections, time(0)+(time_t)10/*=in future=expire all*/);
1.54 paf 104: }
105:
1.71 paf 106: /// @param aurl protocol://[driver-dependent]
1.99 moko 107: SQL_Connection* SQL_Driver_manager::get_connection(const String& aurl, Table *protocol2driver_and_client, const char* arequest_charset, const char* adocument_root) {
1.54 paf 108: // we have table for locating protocol's library
109: if(!protocol2driver_and_client)
1.99 moko 110: throw Exception(PARSER_RUNTIME, &aurl, "$" MAIN_SQL_NAME ":" MAIN_SQL_DRIVERS_NAME " table must be defined");
1.54 paf 111:
112: // first trying to get cached connection
1.71 paf 113: SQL_Connection* connection=get_connection_from_cache(aurl);
1.58 paf 114: if(connection) {
1.71 paf 115: connection->set_url();
1.58 paf 116: if(!connection->ping()) { // we have some cached connection, is it pingable?
117: connection->disconnect(); // kill unpingabe=dead connection
118: connection=0;
1.54 paf 119: }
120: }
121:
1.71 paf 122: char *url_cstr;
1.58 paf 123: if(connection)
1.71 paf 124: url_cstr=0; // calm, compiler
1.54 paf 125: else { // no cached connection or it were unpingabe: connect/reconnect
1.71 paf 126: url_cstr=aurl.cstrm();
127: if(!strstr(url_cstr, "://"))
1.99 moko 128: throw Exception(PARSER_RUNTIME, aurl.length()?&aurl:0, "connection string must start with protocol://");
1.54 paf 129:
1.71 paf 130:
131: char *protocol_cstr=lsplit(&url_cstr, ':');
1.54 paf 132: // skip "//" after ':'
1.71 paf 133: while(*url_cstr=='/')
134: url_cstr++;
135: const String& protocol=*new String(protocol_cstr);
1.54 paf 136:
137: SQL_Driver *driver;
138: // first trying to get cached driver
1.71 paf 139: if(!(driver=get_driver_from_cache(protocol))) {
1.54 paf 140: // no cached
1.71 paf 141: const String* library=0;
142: const String* dlopen_file_spec=0;
1.70 paf 143: Table::Action_options options;
1.71 paf 144: if(protocol2driver_and_client->locate(0, protocol, options)) {
145: if(!(library=protocol2driver_and_client->item(1)) || library->length()==0)
1.99 moko 146: throw Exception(PARSER_RUNTIME, 0, "driver library column for protocol '%s' is empty", protocol_cstr);
1.54 paf 147: dlopen_file_spec=protocol2driver_and_client->item(2);
148: } else
1.99 moko 149: throw Exception(PARSER_RUNTIME, &aurl, "undefined protocol '%s'", protocol_cstr);
1.71 paf 150:
1.92 moko 151: pa_dlinit();
1.54 paf 152:
1.90 misha 153: const char* filename=library->taint_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();
1.104 moko 157: throw Exception(0, library, error ? error : "cannot open the module");
1.79 paf 158: }
1.54 paf 159:
1.86 paf 160: SQL_Driver_create_func create=(SQL_Driver_create_func)(lt_dlsym(handle,
161: SQL_DRIVER_CREATE_NAME));
1.54 paf 162: if(!create)
1.99 moko 163: throw Exception(0, library, "function '" SQL_DRIVER_CREATE_NAME "' was not found");
1.54 paf 164:
165: // create library-driver!
166: driver=(*create)();
167:
168: // validate driver api version
169: int driver_api_version=driver->api_version();
170: if(driver_api_version!=SQL_DRIVER_API_VERSION)
1.99 moko 171: throw Exception(0, library, "driver implements API version 0x%04X not equal to 0x%04X", driver_api_version, SQL_DRIVER_API_VERSION);
1.54 paf 172:
173: // initialise by connecting to sql client dynamic link library
1.71 paf 174: char* dlopen_file_spec_cstr=
175: dlopen_file_spec && dlopen_file_spec->length()?
1.90 misha 176: dlopen_file_spec->taint_cstrm(String::L_AS_IS):0;
1.71 paf 177: if(const char* error=driver->initialize(dlopen_file_spec_cstr))
1.99 moko 178: throw Exception(0, library, "driver failed to initialize client library '%s', %s", dlopen_file_spec_cstr ? dlopen_file_spec_cstr : "unspecifed", error);
1.54 paf 179:
180: // cache it
1.71 paf 181: put_driver_to_cache(protocol, driver);
1.54 paf 182: }
183:
1.88 misha 184: connection=new SQL_Connection(aurl, *driver, arequest_charset, adocument_root);
1.71 paf 185: // associate with pool[request] (deassociates at close)
186: connection->set_url();
1.54 paf 187: }
188:
1.58 paf 189: // if not connected yet, do that now, when connection has services
190: if(!connection->connected())
1.71 paf 191: connection->connect(url_cstr);
1.58 paf 192: // return autoclosing object for it
1.71 paf 193: return connection;
1.54 paf 194: }
195:
1.99 moko 196: void SQL_Driver_manager::close_connection(connection_cache_type::key_type url, SQL_Connection* connection) {
1.54 paf 197: put_connection_to_cache(url, connection);
198: }
199:
200:
201: // driver cache
202:
1.71 paf 203: SQL_Driver *SQL_Driver_manager::get_driver_from_cache(driver_cache_type::key_type protocol) {
1.54 paf 204: SYNCHRONIZED;
205:
1.71 paf 206: return driver_cache.get(protocol);
1.54 paf 207: }
208:
1.99 moko 209: void SQL_Driver_manager::put_driver_to_cache(driver_cache_type::key_type protocol, driver_cache_type::value_type driver) {
1.54 paf 210: SYNCHRONIZED;
211:
1.71 paf 212: driver_cache.put(protocol, driver);
1.54 paf 213: }
214:
215: // connection cache
216: /// @todo get rid of memory spending Stack [zeros deep inside got accumulated]
1.99 moko 217: SQL_Connection* SQL_Driver_manager::get_connection_from_cache(connection_cache_type::key_type url) {
1.54 paf 218: SYNCHRONIZED;
219:
1.71 paf 220: if(connection_cache_type::value_type connections=connection_cache.get(url))
221: while(!connections->is_empty()) { // there are cached connections to that 'url'
222: SQL_Connection* result=connections->pop();
1.54 paf 223: if(result->connected()) // not expired?
224: return result;
225: }
226:
227: return 0;
228: }
229:
1.99 moko 230: void SQL_Driver_manager::put_connection_to_cache(connection_cache_type::key_type url, SQL_Connection* connection) {
1.54 paf 231: SYNCHRONIZED;
232:
1.71 paf 233: connection_cache_type::value_type connections=connection_cache.get(url);
1.54 paf 234: if(!connections) { // there are no cached connections to that 'url' yet?
1.71 paf 235: connections=new connection_cache_element_base_type;
1.54 paf 236: connection_cache.put(url, connections);
237: }
1.71 paf 238: connections->push(connection);
1.54 paf 239: }
240:
241: void SQL_Driver_manager::maybe_expire_cache() {
242: time_t now=time(0);
243:
244: if(prev_expiration_pass_time<now-CHECK_EXPIRED_CONNECTIONS_SECONDS) {
1.86 paf 245: connection_cache.for_each<time_t>(expire_connections, time_t(now-EXPIRE_UNUSED_CONNECTION_SECONDS));
1.54 paf 246:
247: prev_expiration_pass_time=now;
248: }
249: }
250:
1.76 paf 251: static void add_connection_to_status_cache_table(SQL_Connection& connection, Table* table) {
1.54 paf 252: if(connection.connected()) {
1.76 paf 253: ArrayString& row=*new ArrayString;
1.54 paf 254:
255: // url
1.76 paf 256: row+=&connection.services().url_without_login();
1.54 paf 257: // time
1.58 paf 258: time_t time_used=connection.get_time_used();
1.76 paf 259: row+=new String(pa_strdup(ctime(&time_used)));
1.54 paf 260:
1.76 paf 261: *table+=&row;
1.54 paf 262: }
263: }
1.99 moko 264: static void add_connections_to_status_cache_table(SQL_Driver_manager::connection_cache_type::key_type /*key*/, SQL_Driver_manager::connection_cache_type::value_type stack, Table* table) {
1.103 moko 265: for(Array_iterator<SQL_Connection*> i(*stack); i; )
1.77 paf 266: add_connection_to_status_cache_table(*i.next(), table);
1.76 paf 267: }
268:
1.71 paf 269: Value* SQL_Driver_manager::get_status() {
270: Value* result=new VHash;
1.76 paf 271:
1.54 paf 272: // cache
273: {
1.76 paf 274: ArrayString& columns=*new ArrayString;
1.71 paf 275: columns+=new String("url");
276: columns+=new String("time");
1.76 paf 277: Table& table=*new Table(&columns, connection_cache.count());
1.54 paf 278:
1.86 paf 279: connection_cache.for_each<Table*>(add_connections_to_status_cache_table, &table);
1.54 paf 280:
1.76 paf 281: result->get_hash()->put(*new String("cache"), new VTable(&table));
282: }
1.54 paf 283:
284: return result;
1.57 paf 285: }
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