Annotation of parser3/src/classes/op.C, revision 1.153.2.2
1.1 paf 1: /** @file
1.9 paf 2: Parser: parser @b operators.
1.1 paf 3:
1.145 paf 4: Copyright (c) 2001-2004 ArtLebedev Group (http://www.artlebedev.com)
1.71 paf 5: Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
1.98 paf 6: */
1.1 paf 7:
1.153.2.2! paf 8: static const char * const IDENT_OP_C="$Date: 2005/07/27 09:18:33 $";
1.1 paf 9:
1.13 paf 10: #include "classes.h"
1.129 paf 11: #include "pa_vmethod_frame.h"
12:
1.1 paf 13: #include "pa_common.h"
1.134 paf 14: #include "pa_os.h"
1.1 paf 15: #include "pa_request.h"
16: #include "pa_vint.h"
17: #include "pa_sql_connection.h"
1.79 paf 18: #include "pa_vdate.h"
1.105 paf 19: #include "pa_vmethod_frame.h"
1.129 paf 20: #include "pa_vclass.h"
1.144 paf 21: #include "pa_charset.h"
1.1 paf 22:
1.18 parser 23: // limits
24:
25: #define MAX_LOOPS 10000
26:
1.10 paf 27: // defines
28:
1.82 paf 29: #define CASE_DEFAULT_VALUE "DEFAULT"
1.146 paf 30: #define PROCESS_MAIN_OPTION_NAME "main"
31: #define PROCESS_FILE_OPTION_NAME "file"
32: #define PROCESS_LINENO_OPTION_NAME "lineno"
1.11 paf 33:
1.10 paf 34: // class
35:
1.113 paf 36: class VClassMAIN: public VClass {
1.10 paf 37: public:
1.129 paf 38: VClassMAIN();
1.10 paf 39: };
40:
1.129 paf 41: // defines for statics
42:
43: #define SWITCH_DATA_NAME "SWITCH-DATA"
44: #define CACHE_DATA_NAME "CACHE-DATA"
45: #define EXCEPTION_VAR_NAME "exception"
46:
47: // statics
48:
49: //^switch ^case
50: static const String switch_data_name(SWITCH_DATA_NAME);
51: //^cache
52: static const String cache_data_name(CACHE_DATA_NAME);
53:
54: static const String exception_var_name(EXCEPTION_VAR_NAME);
55:
1.136 paf 56: // local defines
57:
58: #define CACHE_EXCEPTION_HANDLED_CACHE_NAME "cache"
59:
1.129 paf 60: // helpers
61:
1.130 paf 62: class Untaint_lang_name2enum: public Hash<const String::Body, String::Language> {
1.129 paf 63: public:
64: Untaint_lang_name2enum() {
65: #define ULN(name, LANG) \
1.130 paf 66: put(String::Body(name), (value_type)(String::L_##LANG));
1.129 paf 67: ULN("as-is", AS_IS);
68: ULN("optimized-as-is", AS_IS|String::L_OPTIMIZE_BIT);
69: ULN("file-spec", FILE_SPEC);
70: ULN("http-header", HTTP_HEADER);
71: ULN("mail-header", MAIL_HEADER);
72: ULN("uri", URI);
73: ULN("sql", SQL);
74: ULN("js", JS);
75: ULN("xml", XML);
76: ULN("optimized-xml", XML|String::L_OPTIMIZE_BIT);
77: ULN("html", HTML);
78: ULN("optimized-html", HTML|String::L_OPTIMIZE_BIT);
79: #undef ULN
80: }
81: } untaint_lang_name2enum;
82:
1.10 paf 83: // methods
84:
1.129 paf 85: static void _if(Request& r, MethodParams& params) {
86: Value& condition_code=params.as_junction(0, "condition must be expression");
1.1 paf 87:
1.81 paf 88: bool condition=r.process_to_value(condition_code,
1.1 paf 89: false/*don't intercept string*/).as_bool();
1.6 paf 90: if(condition)
1.129 paf 91: r.write_pass_lang(r.process(params.as_junction(1, "'then' parameter must be code")));
92: else if(params.count()>2)
93: r.write_pass_lang(r.process(params.as_junction(2, "'else' parameter must be code")));
1.1 paf 94: }
95:
1.129 paf 96: static void _untaint(Request& r, MethodParams& params) {
1.1 paf 97:
1.129 paf 98: String::Language lang;
99: if(params.count()==1)
100: lang=String::L_AS_IS; // mark as simply 'tainted'. useful in html from sql
1.59 paf 101: else {
1.129 paf 102: const String& lang_name=params.as_string(0, "lang must be string");
103: lang=untaint_lang_name2enum.get(lang_name);
1.59 paf 104: if(!lang)
1.78 paf 105: throw Exception(0,
1.59 paf 106: &lang_name,
107: "invalid taint language");
108: }
1.1 paf 109:
110: {
1.129 paf 111: Value& vbody=params.as_junction(params.count()-1, "body must be code");
1.1 paf 112:
113: Temp_lang temp_lang(r, lang); // set temporarily specified ^untaint[language;
1.86 paf 114: r.write_pass_lang(r.process(vbody)); // process marking tainted with that lang
1.1 paf 115: }
116: }
117:
1.129 paf 118: static void _taint(Request& r, MethodParams& params) {
119: String::Language lang;
120: if(params.count()==1)
121: lang=String::L_TAINTED; // mark as simply 'tainted'. useful in table:set
1.1 paf 122: else {
1.129 paf 123: const String& lang_name=params.as_string(0, "lang must be string");
124: lang=untaint_lang_name2enum.get(lang_name);
1.1 paf 125: if(!lang)
1.78 paf 126: throw Exception(0,
1.3 paf 127: &lang_name,
128: "invalid taint language");
1.1 paf 129: }
130:
131: {
1.129 paf 132: Value& vbody=params.as_no_junction(params.count()-1, "body must not be code");
1.1 paf 133:
1.129 paf 134: String result;
1.1 paf 135: result.append(
136: vbody.as_string(), // process marking tainted with that lang
137: lang, true); // force result language to specified
138: r.write_pass_lang(result);
139: }
140: }
141:
1.129 paf 142: static void _process(Request& r, MethodParams& params) {
143: Method* main_method;
144:
145: size_t index=0;
146: Value* target_self;
147: Value& maybe_target_self=params[index];
148: if(maybe_target_self.get_string() || maybe_target_self.get_junction())
149: target_self=&r.get_method_frame()->caller()->self();
150: else {
151: target_self=&maybe_target_self; index++;
152: }
153:
1.1 paf 154: {
1.129 paf 155: VStateless_class *target_class=target_self->get_last_derived_class();
1.116 paf 156: if(!target_class)
157: throw Exception("parser.runtime",
1.129 paf 158: 0,
1.116 paf 159: "no target class");
1.114 paf 160:
1.73 paf 161: // temporary remove language change
1.129 paf 162: Temp_lang temp_lang(r, String::L_PASS_APPENDED);
1.1 paf 163: // temporary zero @main so to maybe-replace it in processed code
1.129 paf 164: Temp_method temp_method_main(*target_class, main_method_name, 0);
1.1 paf 165: // temporary zero @auto so it wouldn't be auto-called in Request::use_buf
1.129 paf 166: Temp_method temp_method_auto(*target_class, auto_method_name, 0);
167:
1.146 paf 168: size_t options_index=index+1;
169: HashStringValue* options=0;
170: if(options_index<params.count()) {
171: Value& voptions=params.as_no_junction(options_index, "options must not be code");
172: options=voptions.get_hash();
173: if(!options)
174: throw Exception("parser.runtime",
175: 0,
176: "options must be hash");
177: }
178:
1.129 paf 179: const String* main_alias=0;
1.146 paf 180: const String* file_alias=0;
181: int line_no_alias_offset=0;
182: if(options) {
183: int valid_options=0;
184: if(Value* vmain_alias=options->get(PROCESS_MAIN_OPTION_NAME)) {
185: valid_options++;
186: main_alias=&vmain_alias->as_string();
187: }
188: if(Value* vfile_alias=options->get(PROCESS_FILE_OPTION_NAME)) {
189: valid_options++;
190: file_alias=&vfile_alias->as_string();
191: }
192: if(Value* vline_no_alias_offset=options->get(PROCESS_LINENO_OPTION_NAME)) {
193: valid_options++;
194: line_no_alias_offset=vline_no_alias_offset->as_int();
195: }
196:
197: if(valid_options!=options->count())
198: throw Exception("parser.runtime",
199: 0,
200: "called with invalid option");
201: }
1.129 paf 202:
1.146 paf 203: uint processe_file_no=file_alias?
204: r.register_file(r.absolute(*file_alias))
205: : pseudo_file_no__process;
206: // process...{string}
207: Value& vjunction=params.as_junction(index, "body must be code");
208: // evaluate source to process
209: const String& source=r.process_to_string(vjunction);
210: r.use_buf(*target_class,
211: source.cstr(String::L_UNSPECIFIED, r.connection(false)),
212: main_alias,
213: processe_file_no,
214: line_no_alias_offset);
1.1 paf 215:
1.73 paf 216: // main_method
1.129 paf 217: main_method=target_class->get_method(main_method_name);
1.73 paf 218: }
219: // after restoring current-request-lang
220: // maybe-execute @main[]
221: if(main_method) {
1.119 paf 222: // temporarily set method_frame's self to target_self
1.129 paf 223: Temp_method_frame_self tmfs(*r.get_method_frame(), *target_self);
1.73 paf 224: // execute!
225: r.execute(*main_method->parser_code);
1.1 paf 226: }
227: }
228:
1.138 paf 229: static void _rem(Request&, MethodParams& params) {
1.129 paf 230: params.as_junction(0, "body must be code");
1.1 paf 231: }
232:
1.129 paf 233: static void _while(Request& r, MethodParams& params) {
234: Value& vcondition=params.as_junction(0, "condition must be expression");
235: Value& body=params.as_junction(1, "body must be code");
1.1 paf 236:
237: // while...
238: int endless_loop_count=0;
239: while(true) {
1.18 parser 240: if(++endless_loop_count>=MAX_LOOPS) // endless loop?
1.78 paf 241: throw Exception("parser.runtime",
1.129 paf 242: 0,
1.1 paf 243: "endless loop detected");
244:
1.86 paf 245: bool condition=r.process_to_value(vcondition,
1.1 paf 246: false/*don't intercept string*/).as_bool();
247: if(!condition) // ...condition is true
248: break;
249:
250: // write processed body
1.86 paf 251: r.write_pass_lang(r.process(body));
1.1 paf 252: }
253: }
254:
1.129 paf 255: static void _use(Request& r, MethodParams& params) {
256: Value& vfile=params.as_no_junction(0, "file name must not be code");
1.113 paf 257: r.use_file(r.main_class, vfile.as_string());
1.1 paf 258: }
259:
1.129 paf 260: static void _for(Request& r, MethodParams& params) {
261: const String& var_name=params.as_string(0, "var name must be string");
262: int from=params.as_int(1, "from must be int", r);
263: int to=params.as_int(2, "to must be int", r);
264: Value& body_code=params.as_junction(3, "body must be code");
265: Value* delim_maybe_code=params.count()>4?¶ms[4]:0;
1.1 paf 266:
1.57 paf 267: if(to-from>=MAX_LOOPS) // too long loop?
1.78 paf 268: throw Exception("parser.runtime",
1.129 paf 269: 0,
1.57 paf 270: "endless loop detected");
271:
1.1 paf 272: bool need_delim=false;
1.129 paf 273: VInt* vint=new VInt(0);
1.153.2.1 paf 274:
275: VMethodFrame& caller=*r.get_method_frame()->caller();
1.153.2.2! paf 276: caller.put_element(caller, var_name, vint);
1.1 paf 277: for(int i=from; i<=to; i++) {
278: vint->set_int(i);
279:
1.108 paf 280: StringOrValue sv_processed=r.process(body_code);
1.129 paf 281: const String* s_processed=sv_processed.get_string();
282: if(delim_maybe_code && s_processed && s_processed->length()) { // delimiter set and we have body
1.108 paf 283: if(need_delim) // need delim & iteration produced string?
1.86 paf 284: r.write_pass_lang(r.process(*delim_maybe_code));
1.1 paf 285: need_delim=true;
286: }
1.108 paf 287: r.write_pass_lang(sv_processed);
1.1 paf 288: }
289: }
290:
1.129 paf 291: static void _eval(Request& r, MethodParams& params) {
292: Value& expr=params.as_junction(0, "need expression");
1.1 paf 293: // evaluate expresion
1.129 paf 294: Value& value_result=r.process_to_value(expr,
1.1 paf 295: true/*don't intercept string*/).as_expr_result();
1.129 paf 296: if(params.count()>1) {
297: Value& fmt=params.as_no_junction(1, "fmt must not be code");
298: r.write_no_lang(String(format(value_result.as_double(), fmt.as_string().cstrm())));
1.91 paf 299: } else
1.129 paf 300: r.write_no_lang(value_result);
1.1 paf 301: }
302:
1.129 paf 303: static void _connect(Request& r, MethodParams& params) {
1.63 paf 304: #ifdef RESOURCES_DEBUG
305: struct timeval mt[2];
306: #endif
1.129 paf 307: Value& url=params.as_no_junction(0, "url must not be code");
308: Value& body_code=params.as_junction(1, "body must be code");
1.1 paf 309:
1.129 paf 310: Table* protocol2driver_and_client=0;
311: if(Value* sql=r.main_class.get_element(String(MAIN_SQL_NAME), r.main_class, false)) {
312: if(Value* element=sql->get_element(String(MAIN_SQL_DRIVERS_NAME), *sql, false)) {
1.113 paf 313: protocol2driver_and_client=element->get_table();
314: }
315: }
1.11 paf 316:
1.63 paf 317: #ifdef RESOURCES_DEBUG
318: //measure:before
319: gettimeofday(&mt[0],NULL);
320: #endif
1.1 paf 321: // connect
1.142 paf 322: SQL_Connection* connection=SQL_driver_manager->get_connection(url.as_string(),
1.144 paf 323: protocol2driver_and_client,
324: r.charsets.source().NAME().cstr());
1.1 paf 325:
1.63 paf 326: #ifdef RESOURCES_DEBUG
327: //measure:after connect
328: gettimeofday(&mt[1],NULL);
329:
330: double t[2];
331: for(int i=0;i<2;i++)
332: t[i]=mt[i].tv_sec+mt[i].tv_usec/1000000.0;
333:
334: r.sql_connect_time+=t[1]-t[0];
335: #endif
1.129 paf 336: Temp_connection temp_connection(r, connection);
1.1 paf 337: // execute body
1.53 parser 338: try {
1.86 paf 339: r.write_assign_lang(r.process(body_code));
1.129 paf 340: connection->commit();
341: connection->close();
1.75 paf 342: } catch(...) { // process problem
1.129 paf 343: connection->rollback();
344: connection->close();
345: rethrow;
1.1 paf 346: }
347: }
348:
1.41 parser 349: #ifndef DOXYGEN
1.129 paf 350: class Switch_data: public PA_Object {
351: public:
352: Request& r;
353: Value& searching;
354: Value* found;
355: Value* _default;
356: public:
357: Switch_data(Request& ar, Value& asearching):
358: r(ar), searching(asearching) {}
1.28 parser 359: };
1.41 parser 360: #endif
1.129 paf 361: static void _switch(Request& r, MethodParams& params) {
362: Switch_data* data=new Switch_data(r, r.process_to_value(params[0]));
1.135 paf 363: Temp_hash_value<const String::Body, void*>
1.129 paf 364: switch_data_setter(r.classes_conf, switch_data_name, data);
1.28 parser 365:
1.129 paf 366: Value& cases_code=params.as_junction(1, "switch cases must be code");
1.82 paf 367: // execution of found ^case[...]{code} must be in context of ^switch[...]{code}
368: // because of stacked WWrapper used there as wcontext
1.84 paf 369: r.process(cases_code, true/*intercept_string*/);
1.147 paf 370: if(Value* selected_code=data->found? data->found: data->_default)
1.107 paf 371: r.write_pass_lang(r.process(*selected_code));
1.28 parser 372: }
373:
1.129 paf 374: static void _case(Request& r, MethodParams& params) {
375: Switch_data* data=static_cast<Switch_data*>(r.classes_conf.get(switch_data_name));
1.38 parser 376: if(!data)
1.78 paf 377: throw Exception("parser.runtime",
1.129 paf 378: 0,
1.38 parser 379: "without switch");
1.28 parser 380:
1.129 paf 381: int count=params.count();
382: Value& code=params.as_junction(--count, "case result must be code");
1.83 paf 383:
1.28 parser 384: for(int i=0; i<count; i++) {
1.129 paf 385: Value& value=r.process_to_value(params[i]);
1.28 parser 386:
1.82 paf 387: if(value.as_string() == CASE_DEFAULT_VALUE) {
1.129 paf 388: data->_default=&code;
1.28 parser 389: break;
390: }
391:
392: bool matches;
1.129 paf 393: if(data->searching.is_string())
394: matches=data->searching.as_string() == value.as_string();
1.28 parser 395: else
1.129 paf 396: matches=data->searching.as_double() == value.as_double();
1.28 parser 397:
398: if(matches) {
1.82 paf 399: if(data->found)
400: throw Exception("parser.runtime",
1.129 paf 401: 0,
1.82 paf 402: "duplicate found");
403:
1.129 paf 404: data->found=&code;
1.28 parser 405: break;
406: }
407: }
408: }
1.136 paf 409: #ifndef DOXYGEN
410: struct Try_catch_result {
411: StringOrValue processed_code;
412: const String* exception_should_be_handled;
413:
414: Try_catch_result(): exception_should_be_handled(0) {}
415: };
416: #endif
417:
418: /// used by ^try and ^cache, @returns $exception.handled[string] if any
419: template<class I>
420: static Try_catch_result try_catch(Request& r,
421: StringOrValue body_code(Request&, I), I info,
422: Value* catch_code)
423: {
424: Try_catch_result result;
425: if(!catch_code) {
426: result.processed_code=body_code(r, info);
427: return result;
428: }
429:
430: // taking snapshot of try-context
431: Request_context_saver try_context(r);
432: try {
433: result.processed_code=body_code(r, info);
434: } catch(const Exception& e) {
435: Request_context_saver throw_context(r); // taking snapshot of throw-context [stack trace contains error]
436: Request::Exception_details details=r.get_details(e);
437: try_context.restore(); // restoring try-context to perform catch-code
438:
439: Junction* junction=catch_code->get_junction();
440: Value* method_frame=junction->method_frame;
441: Value* saved_exception_var_value=method_frame->get_element(exception_var_name, *method_frame, false);
1.153.2.1 paf 442: VMethodFrame& frame=*junction->method_frame;
1.153.2.2! paf 443: frame.put_element(frame, exception_var_name, &details.vhash);
1.136 paf 444: result.processed_code=r.process(*catch_code);
445:
446: // retriving $exception.handled, restoring $exception var
447: Value* vhandled=details.vhash.hash().get(exception_handled_part_name);
1.153.2.2! paf 448: frame.put_element(frame, exception_var_name, saved_exception_var_value);
1.136 paf 449:
450: bool bhandled=false;
451: if(vhandled) {
452: if(vhandled->is_string()) { // not simple $exception.handled(1/0)?
453: result.exception_should_be_handled=vhandled->get_string(); // considering 'recovered' and let the caller recover
454: return result;
455: }
456:
457: bhandled=vhandled->as_bool();
458: }
459:
460: if(!bhandled) {
461: throw_context.restore(); // restoring throw-context [exception were not handled]
462: rethrow;
463: }
464: }
465: return result;
466: }
1.28 parser 467:
1.63 paf 468: // cache--
469:
470: // consts
471:
1.152 paf 472: const int DATA_STRING_SERIALIZED_VERSION=0x0006;
1.63 paf 473:
474: // helper types
475:
476: #ifndef DOXYGEN
477: struct Data_string_serialized_prolog {
478: int version;
1.79 paf 479: time_t expires;
1.63 paf 480: };
481: #endif
482:
1.68 paf 483: void cache_delete(const String& file_spec) {
484: file_delete(file_spec, false/*fail_on_read_problem*/);
1.63 paf 485: }
1.69 paf 486:
487: #ifndef DOXYGEN
1.135 paf 488: struct Cache_scope {
1.129 paf 489: public:
1.79 paf 490: time_t expires;
1.135 paf 491: const String* body_from_disk;
1.79 paf 492: };
1.69 paf 493: struct Locked_process_and_cache_put_action_info {
494: Request *r;
1.136 paf 495: Cache_scope *scope;
496: Value* body_code; Value* catch_code;
497: const String* processed_code;
1.69 paf 498: };
499: #endif
1.136 paf 500:
501:
502:
503: static StringOrValue process_cache_body_code(Request& r, Value* body_code) {
1.153 paf 504: return StringOrValue(r.process_to_string(*body_code));
1.136 paf 505: }
506:
1.129 paf 507: /* @todo maybe network order worth spending some effort?
508: don't bothering myself with network byte order,
509: am not planning to be able to move resulting file across platforms
510: */
1.69 paf 511: static void locked_process_and_cache_put_action(int f, void *context) {
512: Locked_process_and_cache_put_action_info& info=
513: *static_cast<Locked_process_and_cache_put_action_info *>(context);
1.129 paf 514:
1.69 paf 515: // body->process
1.136 paf 516: Try_catch_result result=try_catch(*info.r,
517: process_cache_body_code, info.body_code,
518: info.catch_code);
519:
520: if(result.exception_should_be_handled) {
521: if(*result.exception_should_be_handled==CACHE_EXCEPTION_HANDLED_CACHE_NAME) {
522: if(const String* body_from_disk=info.scope->body_from_disk) // we have something old?
523: info.processed_code=body_from_disk;
524: else
525: throw Exception(0,
526: new String("$"EXCEPTION_VAR_NAME"."EXCEPTION_HANDLED_PART_NAME"["CACHE_EXCEPTION_HANDLED_CACHE_NAME"]"),
527: "fallback failed - there is no old cached body");
528: } else
529: throw Exception("parser.runtime",
530: result.exception_should_be_handled,
531: "$"EXCEPTION_VAR_NAME"."EXCEPTION_HANDLED_PART_NAME" value must be "
532: "either boolean or string '"CACHE_EXCEPTION_HANDLED_CACHE_NAME"'");
533: } else
534: info.processed_code=&result.processed_code.as_string();
1.69 paf 535:
1.79 paf 536: // expiration time not spoiled by ^cache(0) or something?
1.136 paf 537: if(info.scope->expires > time(0)) {
1.79 paf 538: // string -serialize> buffer
1.136 paf 539: String::Cm serialized=info.processed_code->serialize(
1.129 paf 540: sizeof(Data_string_serialized_prolog));
1.79 paf 541: Data_string_serialized_prolog& prolog=
1.129 paf 542: *reinterpret_cast<Data_string_serialized_prolog *>(serialized.str);
1.79 paf 543: prolog.version=DATA_STRING_SERIALIZED_VERSION;
1.136 paf 544: prolog.expires=info.scope->expires;
1.79 paf 545:
546: // buffer -write> file
1.129 paf 547: write(f, serialized.str, serialized.length);
1.79 paf 548: } else // expired!
1.136 paf 549: info.scope->expires=0; // flag it so that could be easily checked by caller
1.69 paf 550: }
1.129 paf 551: const String* locked_process_and_cache_put(Request& r,
1.128 paf 552: Value& body_code,
1.136 paf 553: Value* catch_code,
554: Cache_scope& scope,
555: const String& file_spec)
556: {
1.140 paf 557: Locked_process_and_cache_put_action_info info={&r, &scope, &body_code, catch_code, 0};
1.69 paf 558:
1.129 paf 559: const String* result=file_write_action_under_lock(
1.69 paf 560: file_spec,
561: "cache_put", locked_process_and_cache_put_action, &info,
562: false/*as_text*/,
563: false/*do_append*/,
1.96 paf 564: false/*block*/,
1.136 paf 565: false/*fail on lock problem*/) ? info.processed_code: 0;
1.100 paf 566: time_t now=time(0);
1.136 paf 567: if(scope.expires<=now)
1.79 paf 568: cache_delete(file_spec);
569: return result;
1.63 paf 570: }
1.137 paf 571: #ifndef DOXYGEN
1.135 paf 572: struct Cache_get_result {
573: const String* body;
574: bool expired;
1.137 paf 575: };
576: #endif
577: static Cache_get_result cache_get(Request_charsets& charsets, const String& file_spec, time_t now) {
1.140 paf 578: Cache_get_result result={0, false};
1.135 paf 579:
1.129 paf 580: File_read_result file=file_read(charsets, file_spec,
1.63 paf 581: false/*as_text*/,
1.129 paf 582: 0, //no params
583: false/*fail_on_read_problem*/);
584: if(file.success && file.length/* ignore reads which are empty due to
1.72 paf 585: non-unary open+lockEX conflict with lockSH */) {
1.129 paf 586:
1.72 paf 587: Data_string_serialized_prolog& prolog=
1.129 paf 588: *reinterpret_cast<Data_string_serialized_prolog *>(file.str);
1.63 paf 589:
1.135 paf 590: String* body=new String;
1.72 paf 591: if(
1.129 paf 592: file.length>=sizeof(Data_string_serialized_prolog)
1.135 paf 593: && prolog.version==DATA_STRING_SERIALIZED_VERSION) {
594: if(body->deserialize(sizeof(Data_string_serialized_prolog), file.str, file.length)) {
595: result.body=body;
596: result.expired=prolog.expires <= now;
597: }
598: }
1.72 paf 599: }
1.63 paf 600:
1.135 paf 601: return result;
1.63 paf 602: }
1.129 paf 603: static time_t as_expires(Request& r, MethodParams& params,
1.79 paf 604: int index, time_t now) {
605: time_t result;
1.129 paf 606: if(Value* vdate=params[index].as(VDATE_TYPE, false))
607: result=static_cast<VDate*>(vdate)->get_time();
1.79 paf 608: else
1.129 paf 609: result=now+(time_t)params.as_double(index, "lifespan must be date or number", r);
1.79 paf 610:
611: return result;
612: }
1.129 paf 613: static const String& as_file_spec(Request& r, MethodParams& params, int index) {
614: return r.absolute(params.as_string(index, "filespec must be string"));
1.79 paf 615: }
1.129 paf 616: static void _cache(Request& r, MethodParams& params) {
1.79 paf 617: time_t now=time(0);
618:
619: // ^cache[filename] ^cache(seconds) ^cache[expires date]
1.129 paf 620: if(params.count()==1) {
621: if(params[0].is_string()) { // filename?
1.79 paf 622: cache_delete(as_file_spec(r, params, 0));
623: return;
624: }
625:
626: // secods|expires date
1.135 paf 627: Cache_scope* scope=static_cast<Cache_scope*>(r.classes_conf.get(cache_data_name));
628: if(!scope)
1.79 paf 629: throw Exception("parser.runtime",
1.129 paf 630: 0,
1.79 paf 631: "expire-time reducing instruction without cache");
632:
1.129 paf 633: time_t expires=as_expires(r, params, 0, now);
1.135 paf 634: if(expires < scope->expires)
635: scope->expires=expires;
1.79 paf 636:
637: return;
1.149 paf 638: } else if(params.count()<3)
639: throw Exception("parser.runtime",
640: 0,
641: "invalid number of parameters");
1.63 paf 642:
643: // file_spec, expires, body code
1.129 paf 644: const String& file_spec=r.absolute(params.as_string(0, "filespec must be string"));
1.65 paf 645:
1.141 paf 646: Cache_scope scope={as_expires(r, params, 1, now), 0};
1.135 paf 647:
648: Temp_hash_value<const String::Body, void*>
649: cache_scope_setter(r.classes_conf, cache_data_name, &scope);
1.136 paf 650: Value& body_code=params.as_junction(2, "body_code must be code");
651: Value* catch_code=0;
652: if(params.count()>3)
653: catch_code=¶ms.as_junction(3, "catch_code must be code");
1.63 paf 654:
1.135 paf 655: if(scope.expires>now) { // valid 'expires' specified? try cached copy...
1.69 paf 656: // hence we don't hope to have unary create/lockEX
657: // we need some plan to live in a life like that, so...
658: // worst races plan:
659: // A B
660: // open
661: // |open
662: // lockSH
663: // |nonblocking-lockEX fails
664: // unlockSH
665: // close, cache_get returns 0
666: // open
667: // nonblocking-lockEX succeeds; process, write, close
668: // |retry1: open
669: // ...
670: // |lockSH succeeds; ...
671:
672: for(int retry=0; retry<2; retry++) {
1.135 paf 673: Cache_get_result cached=cache_get(r.charsets, file_spec, now);
1.136 paf 674: if(cached.body) { // have cached copy
1.135 paf 675: if(cached.expired)
676: scope.body_from_disk=cached.body; // storing for user to retrive it with ^cache[]
1.136 paf 677: else // and it's not expired yet
678: {
1.135 paf 679: // write it out
680: r.write_assign_lang(*cached.body);
681: // happy with it
682: return;
683: }
1.79 paf 684: }
1.69 paf 685:
1.135 paf 686: // non-blocked lock; process; cache it
687: if(const String* processed_body=
1.136 paf 688: locked_process_and_cache_put(r, body_code, catch_code, scope, file_spec)) {
1.135 paf 689: // write it out
690: r.write_assign_lang(*processed_body);
691: // happy with it
692: return;
693: } else { // somebody writing result right now
694: pa_sleep(0, 500000); // waiting half a second
695: retry=0; // prolonging our wait, than could cache_get it, without processing body_code
696: }
1.69 paf 697: }
1.78 paf 698: throw Exception(0,
1.69 paf 699: &file_spec,
700: "locking problem");
701: } else {
1.79 paf 702: // instructed not to cache; forget cached copy
1.68 paf 703: cache_delete(file_spec);
1.69 paf 704: // process
1.81 paf 705: const String& processed_body=r.process_to_string(body_code);
1.69 paf 706: // write it out
707: r.write_assign_lang(processed_body);
708: // happy with it
709: return;
710: }
711: // never reached
1.63 paf 712: }
713:
1.136 paf 714: static StringOrValue process_try_body_code(Request& r, Value* body_code) {
715: return r.process(*body_code);
716: }
1.129 paf 717: static void _try_operator(Request& r, MethodParams& params) {
718: Value& body_code=params.as_junction(0, "body_code must be code");
719: Value& catch_code=params.as_junction(1, "catch_code must be code");
1.74 paf 720:
1.136 paf 721: Try_catch_result result=try_catch(r,
722: process_try_body_code, &body_code,
723: &catch_code);
724:
725: if(result.exception_should_be_handled)
726: throw Exception("parser.runtime",
727: result.exception_should_be_handled,
728: "catch block must set $exception.handled to some boolean value, not string");
1.123 paf 729:
1.136 paf 730: // write out processed body_code or catch_code
731: r.write_pass_lang(result.processed_code);
1.74 paf 732: }
733:
1.138 paf 734: static void _throw_operator(Request&, MethodParams& params) {
1.129 paf 735: if(params.count()==1) {
736: if(HashStringValue *hash=params[0].get_hash()) {
737: const char* type=0;
738: if(Value* value=hash->get(exception_type_part_name))
1.78 paf 739: type=value->as_string().cstr();
1.129 paf 740: const String* source=0;
741: if(Value* value=hash->get(exception_source_part_name))
1.74 paf 742: source=&value->as_string();
1.138 paf 743: const char* comment=0;
1.129 paf 744: if(Value* value=hash->get(exception_comment_part_name))
1.74 paf 745: comment=value->as_string().cstr();
746:
1.78 paf 747: throw Exception(type,
1.129 paf 748: source?source:0,
749: "%s", comment?comment:"");
1.74 paf 750: } else
1.78 paf 751: throw Exception("parser.runtime",
1.129 paf 752: 0,
1.74 paf 753: "one-param version has hash param");
754: } else {
1.129 paf 755: const char* type=params.as_string(0, "type must be string").cstr();
756: const String& source=params.as_string(1, "source must be string");
757: const char* comment=params.count()>2? params.as_string(2, "comment must be string").cstr()
758: :0;
1.97 paf 759: throw Exception(type, &source, "%s", comment?comment:"");
1.74 paf 760: }
1.132 paf 761: }
1.129 paf 762:
1.150 paf 763: static void _sleep_operator(Request& r, MethodParams& params) {
764: double seconds=params.as_double(0, "seconds must be double", r);
1.151 paf 765: pa_sleep((int)trunc(seconds), (int)trunc(seconds*1000));
1.150 paf 766: }
767:
1.129 paf 768: #if defined(WIN32) && defined(_DEBUG)
769: # define PA_BPT
1.138 paf 770: static void _bpt(Request&, MethodParams&) {
1.129 paf 771: _asm int 3;
772: }
773: #endif
774:
1.10 paf 775: // constructor
776:
1.129 paf 777: VClassMAIN::VClassMAIN(): VClass() {
778: set_name(*new String(MAIN_CLASS_NAME));
779:
780: #ifdef PA_BPT
781: // ^bpt[]
782: add_native_method("bpt", Method::CT_ANY, _bpt, 0, 0);
783: #endif
1.121 paf 784:
1.1 paf 785: // ^if(condition){code-when-true}
786: // ^if(condition){code-when-true}{code-when-false}
1.10 paf 787: add_native_method("if", Method::CT_ANY, _if, 2, 3);
1.1 paf 788:
789: // ^untaint[as-is|uri|sql|js|html|html-typo]{code}
1.59 paf 790: add_native_method("untaint", Method::CT_ANY, _untaint, 1, 2);
1.1 paf 791:
792: // ^taint[as-is|uri|sql|js|html|html-typo]{code}
1.10 paf 793: add_native_method("taint", Method::CT_ANY, _taint, 1, 2);
1.1 paf 794:
795: // ^process[code]
1.146 paf 796: add_native_method("process", Method::CT_ANY, _process, 1, 3);
1.1 paf 797:
798: // ^rem{code}
1.51 parser 799: add_native_method("rem", Method::CT_ANY, _rem, 1, 10000);
1.1 paf 800:
801: // ^while(condition){code}
1.10 paf 802: add_native_method("while", Method::CT_ANY, _while, 2, 2);
1.1 paf 803:
804: // ^use[file]
1.10 paf 805: add_native_method("use", Method::CT_ANY, _use, 1, 1);
1.1 paf 806:
1.54 paf 807: // ^for[i](from-number;to-number-inclusive){code}[delim]
1.10 paf 808: add_native_method("for", Method::CT_ANY, _for, 3+1, 3+1+1);
1.1 paf 809:
810: // ^eval(expr)
811: // ^eval(expr)[format]
1.10 paf 812: add_native_method("eval", Method::CT_ANY, _eval, 1, 2);
1.52 parser 813:
1.1 paf 814: // ^connect[protocol://user:pass@host[:port]/database]{code with ^sql-s}
1.10 paf 815: add_native_method("connect", Method::CT_ANY, _connect, 2, 2);
816:
1.63 paf 817:
1.136 paf 818: // ^cache[file_spec](time){code}[{catch code}] time=0 no cache
1.65 paf 819: // ^cache[file_spec] delete cache
1.136 paf 820: add_native_method("cache", Method::CT_ANY, _cache, 1, 4);
1.63 paf 821:
1.28 parser 822: // switch
823:
824: // ^switch[value]{cases}
825: add_native_method("switch", Method::CT_ANY, _switch, 2, 2);
826:
827: // ^case[value]{code}
1.51 parser 828: add_native_method("case", Method::CT_ANY, _case, 2, 10000);
1.74 paf 829:
830: // try-catch
831:
832: // ^try{code}{catch code}
833: add_native_method("try", Method::CT_ANY, _try_operator, 2, 2);
834: // ^throw[$exception hash]
835: // ^throw[type;source;comment]
836: add_native_method("throw", Method::CT_ANY, _throw_operator, 1, 3);
837:
1.150 paf 838: add_native_method("sleep", Method::CT_ANY, _sleep_operator, 1, 1);
1.10 paf 839: }
1.11 paf 840:
841: // constructor & configurator
1.1 paf 842:
1.129 paf 843: VStateless_class& VClassMAIN_create() {
844: return *new VClassMAIN;
1.1 paf 845: }
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