Annotation of parser3/src/classes/op.C, revision 1.166
1.1 paf 1: /** @file
1.9 paf 2: Parser: parser @b operators.
1.1 paf 3:
1.155 paf 4: Copyright (c) 2001-2005 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:
1.166 ! misha 8: static const char * const IDENT_OP_C="$Date: 2007/04/20 10:16:54 $";
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:
1.162 paf 25: #define MAX_LOOPS 20000
1.18 parser 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:
1.164 paf 41: // defines for globals
42:
43: #define CYCLE_DATA_NAME "CYCLE-DATA"
44:
45: // globals
46:
47: //^for & co
48: String cycle_data_name(CYCLE_DATA_NAME);
49:
1.129 paf 50: // defines for statics
51:
52: #define SWITCH_DATA_NAME "SWITCH-DATA"
53: #define CACHE_DATA_NAME "CACHE-DATA"
1.164 paf 54:
1.129 paf 55: #define EXCEPTION_VAR_NAME "exception"
56:
57: // statics
58:
59: //^switch ^case
60: static const String switch_data_name(SWITCH_DATA_NAME);
61: //^cache
62: static const String cache_data_name(CACHE_DATA_NAME);
63:
64: static const String exception_var_name(EXCEPTION_VAR_NAME);
65:
1.164 paf 66:
1.136 paf 67: // local defines
68:
69: #define CACHE_EXCEPTION_HANDLED_CACHE_NAME "cache"
70:
1.129 paf 71: // helpers
72:
1.130 paf 73: class Untaint_lang_name2enum: public Hash<const String::Body, String::Language> {
1.129 paf 74: public:
75: Untaint_lang_name2enum() {
76: #define ULN(name, LANG) \
1.130 paf 77: put(String::Body(name), (value_type)(String::L_##LANG));
1.129 paf 78: ULN("as-is", AS_IS);
79: ULN("optimized-as-is", AS_IS|String::L_OPTIMIZE_BIT);
80: ULN("file-spec", FILE_SPEC);
81: ULN("http-header", HTTP_HEADER);
82: ULN("mail-header", MAIL_HEADER);
83: ULN("uri", URI);
84: ULN("sql", SQL);
85: ULN("js", JS);
86: ULN("xml", XML);
87: ULN("optimized-xml", XML|String::L_OPTIMIZE_BIT);
88: ULN("html", HTML);
89: ULN("optimized-html", HTML|String::L_OPTIMIZE_BIT);
1.159 paf 90: ULN("regex", REGEX);
1.129 paf 91: #undef ULN
92: }
93: } untaint_lang_name2enum;
94:
1.10 paf 95: // methods
96:
1.129 paf 97: static void _if(Request& r, MethodParams& params) {
1.156 paf 98: bool condition=params.as_bool(0, "condition must be expression", r);
1.6 paf 99: if(condition)
1.156 paf 100: r.write_pass_lang(r.process(*params.get(1)));
1.129 paf 101: else if(params.count()>2)
1.156 paf 102: r.write_pass_lang(r.process(*params.get(2)));
1.1 paf 103: }
104:
1.129 paf 105: static void _untaint(Request& r, MethodParams& params) {
1.1 paf 106:
1.129 paf 107: String::Language lang;
108: if(params.count()==1)
109: lang=String::L_AS_IS; // mark as simply 'tainted'. useful in html from sql
1.59 paf 110: else {
1.129 paf 111: const String& lang_name=params.as_string(0, "lang must be string");
112: lang=untaint_lang_name2enum.get(lang_name);
1.59 paf 113: if(!lang)
1.78 paf 114: throw Exception(0,
1.59 paf 115: &lang_name,
116: "invalid taint language");
117: }
1.1 paf 118:
119: {
1.129 paf 120: Value& vbody=params.as_junction(params.count()-1, "body must be code");
1.1 paf 121:
122: Temp_lang temp_lang(r, lang); // set temporarily specified ^untaint[language;
1.86 paf 123: r.write_pass_lang(r.process(vbody)); // process marking tainted with that lang
1.1 paf 124: }
125: }
126:
1.129 paf 127: static void _taint(Request& r, MethodParams& params) {
128: String::Language lang;
129: if(params.count()==1)
130: lang=String::L_TAINTED; // mark as simply 'tainted'. useful in table:set
1.1 paf 131: else {
1.129 paf 132: const String& lang_name=params.as_string(0, "lang must be string");
133: lang=untaint_lang_name2enum.get(lang_name);
1.1 paf 134: if(!lang)
1.78 paf 135: throw Exception(0,
1.3 paf 136: &lang_name,
137: "invalid taint language");
1.1 paf 138: }
139:
140: {
1.129 paf 141: Value& vbody=params.as_no_junction(params.count()-1, "body must not be code");
1.1 paf 142:
1.129 paf 143: String result;
1.1 paf 144: result.append(
145: vbody.as_string(), // process marking tainted with that lang
146: lang, true); // force result language to specified
147: r.write_pass_lang(result);
148: }
149: }
150:
1.129 paf 151: static void _process(Request& r, MethodParams& params) {
152: Method* main_method;
153:
154: size_t index=0;
155: Value* target_self;
156: Value& maybe_target_self=params[index];
157: if(maybe_target_self.get_string() || maybe_target_self.get_junction())
158: target_self=&r.get_method_frame()->caller()->self();
159: else {
160: target_self=&maybe_target_self; index++;
161: }
162:
1.1 paf 163: {
1.129 paf 164: VStateless_class *target_class=target_self->get_last_derived_class();
1.116 paf 165: if(!target_class)
1.166 ! misha 166: throw Exception(PARSER_RUNTIME,
1.129 paf 167: 0,
1.116 paf 168: "no target class");
1.114 paf 169:
1.73 paf 170: // temporary remove language change
1.129 paf 171: Temp_lang temp_lang(r, String::L_PASS_APPENDED);
1.1 paf 172: // temporary zero @main so to maybe-replace it in processed code
1.129 paf 173: Temp_method temp_method_main(*target_class, main_method_name, 0);
1.1 paf 174: // temporary zero @auto so it wouldn't be auto-called in Request::use_buf
1.129 paf 175: Temp_method temp_method_auto(*target_class, auto_method_name, 0);
176:
1.146 paf 177: size_t options_index=index+1;
178: HashStringValue* options=0;
179: if(options_index<params.count()) {
180: Value& voptions=params.as_no_junction(options_index, "options must not be code");
181: options=voptions.get_hash();
182: if(!options)
1.166 ! misha 183: throw Exception(PARSER_RUNTIME,
1.146 paf 184: 0,
185: "options must be hash");
186: }
187:
1.129 paf 188: const String* main_alias=0;
1.146 paf 189: const String* file_alias=0;
190: int line_no_alias_offset=0;
191: if(options) {
192: int valid_options=0;
193: if(Value* vmain_alias=options->get(PROCESS_MAIN_OPTION_NAME)) {
194: valid_options++;
195: main_alias=&vmain_alias->as_string();
196: }
197: if(Value* vfile_alias=options->get(PROCESS_FILE_OPTION_NAME)) {
198: valid_options++;
199: file_alias=&vfile_alias->as_string();
200: }
201: if(Value* vline_no_alias_offset=options->get(PROCESS_LINENO_OPTION_NAME)) {
202: valid_options++;
203: line_no_alias_offset=vline_no_alias_offset->as_int();
204: }
205:
206: if(valid_options!=options->count())
1.166 ! misha 207: throw Exception(PARSER_RUNTIME,
1.146 paf 208: 0,
209: "called with invalid option");
210: }
1.129 paf 211:
1.146 paf 212: uint processe_file_no=file_alias?
213: r.register_file(r.absolute(*file_alias))
214: : pseudo_file_no__process;
215: // process...{string}
216: Value& vjunction=params.as_junction(index, "body must be code");
217: // evaluate source to process
218: const String& source=r.process_to_string(vjunction);
219: r.use_buf(*target_class,
220: source.cstr(String::L_UNSPECIFIED, r.connection(false)),
221: main_alias,
222: processe_file_no,
223: line_no_alias_offset);
1.1 paf 224:
1.73 paf 225: // main_method
1.129 paf 226: main_method=target_class->get_method(main_method_name);
1.73 paf 227: }
228: // after restoring current-request-lang
229: // maybe-execute @main[]
230: if(main_method) {
1.119 paf 231: // temporarily set method_frame's self to target_self
1.129 paf 232: Temp_method_frame_self tmfs(*r.get_method_frame(), *target_self);
1.73 paf 233: // execute!
234: r.execute(*main_method->parser_code);
1.1 paf 235: }
236: }
237:
1.138 paf 238: static void _rem(Request&, MethodParams& params) {
1.129 paf 239: params.as_junction(0, "body must be code");
1.1 paf 240: }
241:
1.129 paf 242: static void _while(Request& r, MethodParams& params) {
1.164 paf 243: Temp_hash_value<const String::Body, void*>
244: cycle_data_setter(r.classes_conf, cycle_data_name, /*any not null flag*/&r);
245:
1.129 paf 246: Value& vcondition=params.as_junction(0, "condition must be expression");
1.162 paf 247: Value& body_code=params.as_junction(1, "body must be code");
248: Value* delim_maybe_code=params.count()>2?¶ms[2]:0;
1.1 paf 249:
250: // while...
251: int endless_loop_count=0;
1.162 paf 252: bool need_delim=false;
1.1 paf 253: while(true) {
1.18 parser 254: if(++endless_loop_count>=MAX_LOOPS) // endless loop?
1.166 ! misha 255: throw Exception(PARSER_RUNTIME,
1.129 paf 256: 0,
1.1 paf 257: "endless loop detected");
258:
1.86 paf 259: bool condition=r.process_to_value(vcondition,
1.1 paf 260: false/*don't intercept string*/).as_bool();
261: if(!condition) // ...condition is true
262: break;
263:
1.162 paf 264: StringOrValue sv_processed=r.process(body_code);
1.164 paf 265: Request::Skip lskip=r.get_skip(); r.set_skip(Request::SKIP_NOTHING);
1.162 paf 266: const String* s_processed=sv_processed.get_string();
267: if(delim_maybe_code && s_processed && s_processed->length()) { // delimiter set and we have body
268: if(need_delim) // need delim & iteration produced string?
269: r.write_pass_lang(r.process(*delim_maybe_code));
270: need_delim=true;
271: }
272: r.write_pass_lang(sv_processed);
1.164 paf 273:
274: if(lskip==Request::SKIP_BREAK)
275: break;
1.1 paf 276: }
277: }
278:
1.129 paf 279: static void _use(Request& r, MethodParams& params) {
280: Value& vfile=params.as_no_junction(0, "file name must not be code");
1.113 paf 281: r.use_file(r.main_class, vfile.as_string());
1.1 paf 282: }
283:
1.164 paf 284: static void set_skip(Request& r, Request::Skip askip) {
285: void* data=r.classes_conf.get(cycle_data_name);
286: if(!data)
1.166 ! misha 287: throw Exception(PARSER_RUNTIME,
1.164 paf 288: 0,
289: "without cycle");
290:
291: r.set_skip(askip);
292: }
293:
294: static void _break(Request& r, MethodParams&) {
295: set_skip(r, Request::SKIP_BREAK);
296: }
297:
298: static void _continue(Request& r, MethodParams&) {
299: set_skip(r, Request::SKIP_CONTINUE);
300: }
301:
1.129 paf 302: static void _for(Request& r, MethodParams& params) {
1.164 paf 303: Temp_hash_value<const String::Body, void*>
304: cycle_data_setter(r.classes_conf, cycle_data_name, /*any not null flag*/&r);
305:
1.129 paf 306: const String& var_name=params.as_string(0, "var name must be string");
307: int from=params.as_int(1, "from must be int", r);
308: int to=params.as_int(2, "to must be int", r);
309: Value& body_code=params.as_junction(3, "body must be code");
310: Value* delim_maybe_code=params.count()>4?¶ms[4]:0;
1.1 paf 311:
1.57 paf 312: if(to-from>=MAX_LOOPS) // too long loop?
1.166 ! misha 313: throw Exception(PARSER_RUNTIME,
1.129 paf 314: 0,
1.57 paf 315: "endless loop detected");
316:
1.1 paf 317: bool need_delim=false;
1.129 paf 318: VInt* vint=new VInt(0);
1.154 paf 319:
320: VMethodFrame& caller=*r.get_method_frame()->caller();
321: caller.put_element(caller, var_name, vint, false);
1.1 paf 322: for(int i=from; i<=to; i++) {
323: vint->set_int(i);
324:
1.108 paf 325: StringOrValue sv_processed=r.process(body_code);
1.164 paf 326: Request::Skip lskip=r.get_skip(); r.set_skip(Request::SKIP_NOTHING);
1.129 paf 327: const String* s_processed=sv_processed.get_string();
328: if(delim_maybe_code && s_processed && s_processed->length()) { // delimiter set and we have body
1.108 paf 329: if(need_delim) // need delim & iteration produced string?
1.86 paf 330: r.write_pass_lang(r.process(*delim_maybe_code));
1.1 paf 331: need_delim=true;
332: }
1.108 paf 333: r.write_pass_lang(sv_processed);
1.164 paf 334:
335: if(lskip==Request::SKIP_BREAK)
336: break;
1.1 paf 337: }
338: }
339:
1.129 paf 340: static void _eval(Request& r, MethodParams& params) {
341: Value& expr=params.as_junction(0, "need expression");
1.1 paf 342: // evaluate expresion
1.129 paf 343: Value& value_result=r.process_to_value(expr,
1.165 misha 344: false/*don't intercept string*/).as_expr_result();
1.129 paf 345: if(params.count()>1) {
346: Value& fmt=params.as_no_junction(1, "fmt must not be code");
347: r.write_no_lang(String(format(value_result.as_double(), fmt.as_string().cstrm())));
1.91 paf 348: } else
1.129 paf 349: r.write_no_lang(value_result);
1.1 paf 350: }
351:
1.129 paf 352: static void _connect(Request& r, MethodParams& params) {
1.63 paf 353: #ifdef RESOURCES_DEBUG
354: struct timeval mt[2];
355: #endif
1.129 paf 356: Value& url=params.as_no_junction(0, "url must not be code");
357: Value& body_code=params.as_junction(1, "body must be code");
1.1 paf 358:
1.129 paf 359: Table* protocol2driver_and_client=0;
360: if(Value* sql=r.main_class.get_element(String(MAIN_SQL_NAME), r.main_class, false)) {
361: if(Value* element=sql->get_element(String(MAIN_SQL_DRIVERS_NAME), *sql, false)) {
1.113 paf 362: protocol2driver_and_client=element->get_table();
363: }
364: }
1.11 paf 365:
1.63 paf 366: #ifdef RESOURCES_DEBUG
367: //measure:before
368: gettimeofday(&mt[0],NULL);
369: #endif
1.1 paf 370: // connect
1.142 paf 371: SQL_Connection* connection=SQL_driver_manager->get_connection(url.as_string(),
1.144 paf 372: protocol2driver_and_client,
373: r.charsets.source().NAME().cstr());
1.1 paf 374:
1.63 paf 375: #ifdef RESOURCES_DEBUG
376: //measure:after connect
377: gettimeofday(&mt[1],NULL);
378:
379: double t[2];
380: for(int i=0;i<2;i++)
381: t[i]=mt[i].tv_sec+mt[i].tv_usec/1000000.0;
382:
383: r.sql_connect_time+=t[1]-t[0];
384: #endif
1.129 paf 385: Temp_connection temp_connection(r, connection);
1.1 paf 386: // execute body
1.53 parser 387: try {
1.86 paf 388: r.write_assign_lang(r.process(body_code));
1.129 paf 389: connection->commit();
390: connection->close();
1.75 paf 391: } catch(...) { // process problem
1.129 paf 392: connection->rollback();
393: connection->close();
394: rethrow;
1.1 paf 395: }
396: }
397:
1.41 parser 398: #ifndef DOXYGEN
1.129 paf 399: class Switch_data: public PA_Object {
400: public:
401: Request& r;
402: Value& searching;
403: Value* found;
404: Value* _default;
405: public:
406: Switch_data(Request& ar, Value& asearching):
407: r(ar), searching(asearching) {}
1.28 parser 408: };
1.41 parser 409: #endif
1.129 paf 410: static void _switch(Request& r, MethodParams& params) {
411: Switch_data* data=new Switch_data(r, r.process_to_value(params[0]));
1.135 paf 412: Temp_hash_value<const String::Body, void*>
1.129 paf 413: switch_data_setter(r.classes_conf, switch_data_name, data);
1.28 parser 414:
1.129 paf 415: Value& cases_code=params.as_junction(1, "switch cases must be code");
1.82 paf 416: // execution of found ^case[...]{code} must be in context of ^switch[...]{code}
417: // because of stacked WWrapper used there as wcontext
1.84 paf 418: r.process(cases_code, true/*intercept_string*/);
1.147 paf 419: if(Value* selected_code=data->found? data->found: data->_default)
1.107 paf 420: r.write_pass_lang(r.process(*selected_code));
1.28 parser 421: }
422:
1.129 paf 423: static void _case(Request& r, MethodParams& params) {
424: Switch_data* data=static_cast<Switch_data*>(r.classes_conf.get(switch_data_name));
1.38 parser 425: if(!data)
1.166 ! misha 426: throw Exception(PARSER_RUNTIME,
1.129 paf 427: 0,
1.38 parser 428: "without switch");
1.28 parser 429:
1.129 paf 430: int count=params.count();
431: Value& code=params.as_junction(--count, "case result must be code");
1.83 paf 432:
1.163 paf 433: Value& searching=data->searching;
434: bool we_are_searching_string_or_void=searching.is_string() || searching.is_void();
1.28 parser 435: for(int i=0; i<count; i++) {
1.129 paf 436: Value& value=r.process_to_value(params[i]);
1.28 parser 437:
1.157 paf 438: if(value.is_string() && value.as_string() == CASE_DEFAULT_VALUE) {
1.129 paf 439: data->_default=&code;
1.28 parser 440: break;
441: }
442:
443: bool matches;
1.163 paf 444: if(we_are_searching_string_or_void)
445: matches=searching.as_string() == value.as_string();
1.28 parser 446: else
1.163 paf 447: matches=searching.as_double() == value.as_double();
1.28 parser 448:
449: if(matches) {
1.82 paf 450: if(data->found)
1.166 ! misha 451: throw Exception(PARSER_RUNTIME,
1.129 paf 452: 0,
1.82 paf 453: "duplicate found");
454:
1.129 paf 455: data->found=&code;
1.28 parser 456: break;
457: }
458: }
459: }
1.136 paf 460: #ifndef DOXYGEN
461: struct Try_catch_result {
462: StringOrValue processed_code;
463: const String* exception_should_be_handled;
464:
465: Try_catch_result(): exception_should_be_handled(0) {}
466: };
467: #endif
468:
469: /// used by ^try and ^cache, @returns $exception.handled[string] if any
470: template<class I>
471: static Try_catch_result try_catch(Request& r,
472: StringOrValue body_code(Request&, I), I info,
1.160 paf 473: Value* catch_code, bool could_be_handled_by_caller=false)
1.136 paf 474: {
475: Try_catch_result result;
476: if(!catch_code) {
477: result.processed_code=body_code(r, info);
478: return result;
479: }
480:
481: // taking snapshot of try-context
482: Request_context_saver try_context(r);
483: try {
484: result.processed_code=body_code(r, info);
485: } catch(const Exception& e) {
486: Request_context_saver throw_context(r); // taking snapshot of throw-context [stack trace contains error]
487: Request::Exception_details details=r.get_details(e);
488: try_context.restore(); // restoring try-context to perform catch-code
489:
490: Junction* junction=catch_code->get_junction();
491: Value* method_frame=junction->method_frame;
492: Value* saved_exception_var_value=method_frame->get_element(exception_var_name, *method_frame, false);
1.154 paf 493: VMethodFrame& frame=*junction->method_frame;
494: frame.put_element(frame, exception_var_name, &details.vhash, false);
1.136 paf 495: result.processed_code=r.process(*catch_code);
496:
497: // retriving $exception.handled, restoring $exception var
498: Value* vhandled=details.vhash.hash().get(exception_handled_part_name);
1.154 paf 499: frame.put_element(frame, exception_var_name, saved_exception_var_value, false);
1.136 paf 500:
501: bool bhandled=false;
502: if(vhandled) {
503: if(vhandled->is_string()) { // not simple $exception.handled(1/0)?
1.160 paf 504: if(could_be_handled_by_caller) { // and we can possibly handle it
505: result.exception_should_be_handled=vhandled->get_string(); // considering 'recovered' and let the caller recover
506: return result;
507: }
508:
509: bhandled=false;
510: } else
511: bhandled=vhandled->as_bool();
1.136 paf 512: }
513:
514: if(!bhandled) {
515: throw_context.restore(); // restoring throw-context [exception were not handled]
516: rethrow;
517: }
518: }
519: return result;
520: }
1.28 parser 521:
1.63 paf 522: // cache--
523:
524: // consts
525:
1.152 paf 526: const int DATA_STRING_SERIALIZED_VERSION=0x0006;
1.63 paf 527:
528: // helper types
529:
530: #ifndef DOXYGEN
531: struct Data_string_serialized_prolog {
532: int version;
1.79 paf 533: time_t expires;
1.63 paf 534: };
535: #endif
536:
1.68 paf 537: void cache_delete(const String& file_spec) {
538: file_delete(file_spec, false/*fail_on_read_problem*/);
1.63 paf 539: }
1.69 paf 540:
541: #ifndef DOXYGEN
1.135 paf 542: struct Cache_scope {
1.129 paf 543: public:
1.79 paf 544: time_t expires;
1.135 paf 545: const String* body_from_disk;
1.79 paf 546: };
1.69 paf 547: struct Locked_process_and_cache_put_action_info {
548: Request *r;
1.136 paf 549: Cache_scope *scope;
550: Value* body_code; Value* catch_code;
551: const String* processed_code;
1.69 paf 552: };
553: #endif
1.136 paf 554:
555:
556:
557: static StringOrValue process_cache_body_code(Request& r, Value* body_code) {
1.153 paf 558: return StringOrValue(r.process_to_string(*body_code));
1.136 paf 559: }
560:
1.129 paf 561: /* @todo maybe network order worth spending some effort?
562: don't bothering myself with network byte order,
563: am not planning to be able to move resulting file across platforms
564: */
1.69 paf 565: static void locked_process_and_cache_put_action(int f, void *context) {
566: Locked_process_and_cache_put_action_info& info=
567: *static_cast<Locked_process_and_cache_put_action_info *>(context);
1.129 paf 568:
1.160 paf 569:
570: const String* body_from_disk=info.scope->body_from_disk;
1.69 paf 571: // body->process
1.136 paf 572: Try_catch_result result=try_catch(*info.r,
573: process_cache_body_code, info.body_code,
1.160 paf 574: info.catch_code, body_from_disk!=0 /*we have something old=we can handle=recover later*/);
1.136 paf 575:
576: if(result.exception_should_be_handled) {
577: if(*result.exception_should_be_handled==CACHE_EXCEPTION_HANDLED_CACHE_NAME) {
1.160 paf 578: assert(body_from_disk);
579: info.processed_code=body_from_disk;
1.136 paf 580: } else
1.166 ! misha 581: throw Exception(PARSER_RUNTIME,
1.136 paf 582: result.exception_should_be_handled,
583: "$"EXCEPTION_VAR_NAME"."EXCEPTION_HANDLED_PART_NAME" value must be "
584: "either boolean or string '"CACHE_EXCEPTION_HANDLED_CACHE_NAME"'");
585: } else
586: info.processed_code=&result.processed_code.as_string();
1.69 paf 587:
1.79 paf 588: // expiration time not spoiled by ^cache(0) or something?
1.136 paf 589: if(info.scope->expires > time(0)) {
1.79 paf 590: // string -serialize> buffer
1.136 paf 591: String::Cm serialized=info.processed_code->serialize(
1.129 paf 592: sizeof(Data_string_serialized_prolog));
1.79 paf 593: Data_string_serialized_prolog& prolog=
1.129 paf 594: *reinterpret_cast<Data_string_serialized_prolog *>(serialized.str);
1.79 paf 595: prolog.version=DATA_STRING_SERIALIZED_VERSION;
1.136 paf 596: prolog.expires=info.scope->expires;
1.79 paf 597:
598: // buffer -write> file
1.129 paf 599: write(f, serialized.str, serialized.length);
1.79 paf 600: } else // expired!
1.136 paf 601: info.scope->expires=0; // flag it so that could be easily checked by caller
1.69 paf 602: }
1.129 paf 603: const String* locked_process_and_cache_put(Request& r,
1.128 paf 604: Value& body_code,
1.136 paf 605: Value* catch_code,
606: Cache_scope& scope,
607: const String& file_spec)
608: {
1.140 paf 609: Locked_process_and_cache_put_action_info info={&r, &scope, &body_code, catch_code, 0};
1.69 paf 610:
1.129 paf 611: const String* result=file_write_action_under_lock(
1.69 paf 612: file_spec,
613: "cache_put", locked_process_and_cache_put_action, &info,
614: false/*as_text*/,
615: false/*do_append*/,
1.96 paf 616: false/*block*/,
1.136 paf 617: false/*fail on lock problem*/) ? info.processed_code: 0;
1.100 paf 618: time_t now=time(0);
1.136 paf 619: if(scope.expires<=now)
1.79 paf 620: cache_delete(file_spec);
621: return result;
1.63 paf 622: }
1.137 paf 623: #ifndef DOXYGEN
1.135 paf 624: struct Cache_get_result {
625: const String* body;
626: bool expired;
1.137 paf 627: };
628: #endif
629: static Cache_get_result cache_get(Request_charsets& charsets, const String& file_spec, time_t now) {
1.140 paf 630: Cache_get_result result={0, false};
1.135 paf 631:
1.129 paf 632: File_read_result file=file_read(charsets, file_spec,
1.63 paf 633: false/*as_text*/,
1.129 paf 634: 0, //no params
635: false/*fail_on_read_problem*/);
636: if(file.success && file.length/* ignore reads which are empty due to
1.72 paf 637: non-unary open+lockEX conflict with lockSH */) {
1.129 paf 638:
1.72 paf 639: Data_string_serialized_prolog& prolog=
1.129 paf 640: *reinterpret_cast<Data_string_serialized_prolog *>(file.str);
1.63 paf 641:
1.135 paf 642: String* body=new String;
1.72 paf 643: if(
1.129 paf 644: file.length>=sizeof(Data_string_serialized_prolog)
1.135 paf 645: && prolog.version==DATA_STRING_SERIALIZED_VERSION) {
646: if(body->deserialize(sizeof(Data_string_serialized_prolog), file.str, file.length)) {
647: result.body=body;
648: result.expired=prolog.expires <= now;
649: }
650: }
1.72 paf 651: }
1.63 paf 652:
1.135 paf 653: return result;
1.63 paf 654: }
1.129 paf 655: static time_t as_expires(Request& r, MethodParams& params,
1.79 paf 656: int index, time_t now) {
657: time_t result;
1.129 paf 658: if(Value* vdate=params[index].as(VDATE_TYPE, false))
659: result=static_cast<VDate*>(vdate)->get_time();
1.79 paf 660: else
1.129 paf 661: result=now+(time_t)params.as_double(index, "lifespan must be date or number", r);
1.79 paf 662:
663: return result;
664: }
1.129 paf 665: static const String& as_file_spec(Request& r, MethodParams& params, int index) {
666: return r.absolute(params.as_string(index, "filespec must be string"));
1.79 paf 667: }
1.129 paf 668: static void _cache(Request& r, MethodParams& params) {
1.158 paf 669: if(params.count()==0)
670: {
671: // return current expiration time
672: Cache_scope* scope=static_cast<Cache_scope*>(r.classes_conf.get(cache_data_name));
673: if(!scope)
1.166 ! misha 674: throw Exception(PARSER_RUNTIME,
1.158 paf 675: 0,
676: "expire-time get without cache");
677: r.write_no_lang(*new VDate(scope->expires));
678: return;
679: }
680:
1.79 paf 681: time_t now=time(0);
682:
683: // ^cache[filename] ^cache(seconds) ^cache[expires date]
1.129 paf 684: if(params.count()==1) {
685: if(params[0].is_string()) { // filename?
1.79 paf 686: cache_delete(as_file_spec(r, params, 0));
687: return;
688: }
689:
690: // secods|expires date
1.135 paf 691: Cache_scope* scope=static_cast<Cache_scope*>(r.classes_conf.get(cache_data_name));
692: if(!scope)
1.166 ! misha 693: throw Exception(PARSER_RUNTIME,
1.129 paf 694: 0,
1.79 paf 695: "expire-time reducing instruction without cache");
696:
1.129 paf 697: time_t expires=as_expires(r, params, 0, now);
1.135 paf 698: if(expires < scope->expires)
699: scope->expires=expires;
1.79 paf 700:
701: return;
1.149 paf 702: } else if(params.count()<3)
1.166 ! misha 703: throw Exception(PARSER_RUNTIME,
1.149 paf 704: 0,
705: "invalid number of parameters");
1.63 paf 706:
707: // file_spec, expires, body code
1.129 paf 708: const String& file_spec=r.absolute(params.as_string(0, "filespec must be string"));
1.65 paf 709:
1.141 paf 710: Cache_scope scope={as_expires(r, params, 1, now), 0};
1.135 paf 711:
712: Temp_hash_value<const String::Body, void*>
713: cache_scope_setter(r.classes_conf, cache_data_name, &scope);
1.136 paf 714: Value& body_code=params.as_junction(2, "body_code must be code");
715: Value* catch_code=0;
716: if(params.count()>3)
717: catch_code=¶ms.as_junction(3, "catch_code must be code");
1.63 paf 718:
1.135 paf 719: if(scope.expires>now) { // valid 'expires' specified? try cached copy...
1.69 paf 720: // hence we don't hope to have unary create/lockEX
721: // we need some plan to live in a life like that, so...
722: // worst races plan:
723: // A B
724: // open
725: // |open
726: // lockSH
727: // |nonblocking-lockEX fails
728: // unlockSH
729: // close, cache_get returns 0
730: // open
731: // nonblocking-lockEX succeeds; process, write, close
732: // |retry1: open
733: // ...
734: // |lockSH succeeds; ...
735:
736: for(int retry=0; retry<2; retry++) {
1.135 paf 737: Cache_get_result cached=cache_get(r.charsets, file_spec, now);
1.136 paf 738: if(cached.body) { // have cached copy
1.135 paf 739: if(cached.expired)
740: scope.body_from_disk=cached.body; // storing for user to retrive it with ^cache[]
1.136 paf 741: else // and it's not expired yet
742: {
1.135 paf 743: // write it out
744: r.write_assign_lang(*cached.body);
745: // happy with it
746: return;
747: }
1.79 paf 748: }
1.69 paf 749:
1.135 paf 750: // non-blocked lock; process; cache it
751: if(const String* processed_body=
1.136 paf 752: locked_process_and_cache_put(r, body_code, catch_code, scope, file_spec)) {
1.135 paf 753: // write it out
754: r.write_assign_lang(*processed_body);
755: // happy with it
756: return;
757: } else { // somebody writing result right now
758: pa_sleep(0, 500000); // waiting half a second
759: retry=0; // prolonging our wait, than could cache_get it, without processing body_code
760: }
1.69 paf 761: }
1.78 paf 762: throw Exception(0,
1.69 paf 763: &file_spec,
764: "locking problem");
765: } else {
1.79 paf 766: // instructed not to cache; forget cached copy
1.68 paf 767: cache_delete(file_spec);
1.69 paf 768: // process
1.81 paf 769: const String& processed_body=r.process_to_string(body_code);
1.69 paf 770: // write it out
771: r.write_assign_lang(processed_body);
772: // happy with it
773: return;
774: }
775: // never reached
1.63 paf 776: }
777:
1.136 paf 778: static StringOrValue process_try_body_code(Request& r, Value* body_code) {
779: return r.process(*body_code);
780: }
1.129 paf 781: static void _try_operator(Request& r, MethodParams& params) {
782: Value& body_code=params.as_junction(0, "body_code must be code");
783: Value& catch_code=params.as_junction(1, "catch_code must be code");
1.74 paf 784:
1.136 paf 785: Try_catch_result result=try_catch(r,
786: process_try_body_code, &body_code,
787: &catch_code);
788:
789: if(result.exception_should_be_handled)
1.166 ! misha 790: throw Exception(PARSER_RUNTIME,
1.136 paf 791: result.exception_should_be_handled,
792: "catch block must set $exception.handled to some boolean value, not string");
1.123 paf 793:
1.136 paf 794: // write out processed body_code or catch_code
795: r.write_pass_lang(result.processed_code);
1.74 paf 796: }
797:
1.138 paf 798: static void _throw_operator(Request&, MethodParams& params) {
1.129 paf 799: if(params.count()==1) {
800: if(HashStringValue *hash=params[0].get_hash()) {
801: const char* type=0;
802: if(Value* value=hash->get(exception_type_part_name))
1.78 paf 803: type=value->as_string().cstr();
1.129 paf 804: const String* source=0;
805: if(Value* value=hash->get(exception_source_part_name))
1.74 paf 806: source=&value->as_string();
1.138 paf 807: const char* comment=0;
1.129 paf 808: if(Value* value=hash->get(exception_comment_part_name))
1.74 paf 809: comment=value->as_string().cstr();
810:
1.78 paf 811: throw Exception(type,
1.129 paf 812: source?source:0,
813: "%s", comment?comment:"");
1.74 paf 814: } else
1.166 ! misha 815: throw Exception(PARSER_RUNTIME,
1.129 paf 816: 0,
1.74 paf 817: "one-param version has hash param");
818: } else {
1.129 paf 819: const char* type=params.as_string(0, "type must be string").cstr();
820: const String& source=params.as_string(1, "source must be string");
821: const char* comment=params.count()>2? params.as_string(2, "comment must be string").cstr()
822: :0;
1.97 paf 823: throw Exception(type, &source, "%s", comment?comment:"");
1.74 paf 824: }
1.132 paf 825: }
1.129 paf 826:
1.150 paf 827: static void _sleep_operator(Request& r, MethodParams& params) {
828: double seconds=params.as_double(0, "seconds must be double", r);
1.151 paf 829: pa_sleep((int)trunc(seconds), (int)trunc(seconds*1000));
1.150 paf 830: }
831:
1.129 paf 832: #if defined(WIN32) && defined(_DEBUG)
833: # define PA_BPT
1.138 paf 834: static void _bpt(Request&, MethodParams&) {
1.129 paf 835: _asm int 3;
836: }
837: #endif
838:
1.10 paf 839: // constructor
840:
1.129 paf 841: VClassMAIN::VClassMAIN(): VClass() {
842: set_name(*new String(MAIN_CLASS_NAME));
843:
844: #ifdef PA_BPT
845: // ^bpt[]
846: add_native_method("bpt", Method::CT_ANY, _bpt, 0, 0);
847: #endif
1.121 paf 848:
1.1 paf 849: // ^if(condition){code-when-true}
850: // ^if(condition){code-when-true}{code-when-false}
1.10 paf 851: add_native_method("if", Method::CT_ANY, _if, 2, 3);
1.1 paf 852:
853: // ^untaint[as-is|uri|sql|js|html|html-typo]{code}
1.59 paf 854: add_native_method("untaint", Method::CT_ANY, _untaint, 1, 2);
1.1 paf 855:
856: // ^taint[as-is|uri|sql|js|html|html-typo]{code}
1.10 paf 857: add_native_method("taint", Method::CT_ANY, _taint, 1, 2);
1.1 paf 858:
859: // ^process[code]
1.146 paf 860: add_native_method("process", Method::CT_ANY, _process, 1, 3);
1.1 paf 861:
862: // ^rem{code}
1.51 parser 863: add_native_method("rem", Method::CT_ANY, _rem, 1, 10000);
1.1 paf 864:
865: // ^while(condition){code}
1.162 paf 866: add_native_method("while", Method::CT_ANY, _while, 2, 3);
1.1 paf 867:
868: // ^use[file]
1.10 paf 869: add_native_method("use", Method::CT_ANY, _use, 1, 1);
1.1 paf 870:
1.164 paf 871: // ^break[]
872: add_native_method("break", Method::CT_ANY, _break, 0, 0);
873: // ^continue[]
874: add_native_method("continue", Method::CT_ANY, _continue, 0, 0);
1.54 paf 875: // ^for[i](from-number;to-number-inclusive){code}[delim]
1.10 paf 876: add_native_method("for", Method::CT_ANY, _for, 3+1, 3+1+1);
1.1 paf 877:
878: // ^eval(expr)
879: // ^eval(expr)[format]
1.10 paf 880: add_native_method("eval", Method::CT_ANY, _eval, 1, 2);
1.52 parser 881:
1.1 paf 882: // ^connect[protocol://user:pass@host[:port]/database]{code with ^sql-s}
1.10 paf 883: add_native_method("connect", Method::CT_ANY, _connect, 2, 2);
884:
1.63 paf 885:
1.136 paf 886: // ^cache[file_spec](time){code}[{catch code}] time=0 no cache
1.65 paf 887: // ^cache[file_spec] delete cache
1.161 paf 888: // ^cache[] get current expiration time
889: add_native_method("cache", Method::CT_ANY, _cache, 0, 4);
1.63 paf 890:
1.28 parser 891: // switch
892:
893: // ^switch[value]{cases}
894: add_native_method("switch", Method::CT_ANY, _switch, 2, 2);
895:
896: // ^case[value]{code}
1.51 parser 897: add_native_method("case", Method::CT_ANY, _case, 2, 10000);
1.74 paf 898:
899: // try-catch
900:
901: // ^try{code}{catch code}
902: add_native_method("try", Method::CT_ANY, _try_operator, 2, 2);
903: // ^throw[$exception hash]
904: // ^throw[type;source;comment]
905: add_native_method("throw", Method::CT_ANY, _throw_operator, 1, 3);
906:
1.150 paf 907: add_native_method("sleep", Method::CT_ANY, _sleep_operator, 1, 1);
1.10 paf 908: }
1.11 paf 909:
910: // constructor & configurator
1.1 paf 911:
1.129 paf 912: VStateless_class& VClassMAIN_create() {
913: return *new VClassMAIN;
1.1 paf 914: }
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