Annotation of parser3/src/classes/op.C, revision 1.146
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:
1.146 ! paf 8: static const char * const IDENT_OP_C="$Date: 2004/02/11 15:33:12 $";
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("table", TABLE);
74: ULN("sql", SQL);
75: ULN("js", JS);
76: ULN("xml", XML);
77: ULN("optimized-xml", XML|String::L_OPTIMIZE_BIT);
78: ULN("html", HTML);
79: ULN("optimized-html", HTML|String::L_OPTIMIZE_BIT);
80: #undef ULN
81: }
82: } untaint_lang_name2enum;
83:
1.10 paf 84: // methods
85:
1.129 paf 86: static void _if(Request& r, MethodParams& params) {
87: Value& condition_code=params.as_junction(0, "condition must be expression");
1.1 paf 88:
1.81 paf 89: bool condition=r.process_to_value(condition_code,
1.1 paf 90: false/*don't intercept string*/).as_bool();
1.6 paf 91: if(condition)
1.129 paf 92: r.write_pass_lang(r.process(params.as_junction(1, "'then' parameter must be code")));
93: else if(params.count()>2)
94: r.write_pass_lang(r.process(params.as_junction(2, "'else' parameter must be code")));
1.1 paf 95: }
96:
1.129 paf 97: static void _untaint(Request& r, MethodParams& params) {
1.1 paf 98:
1.129 paf 99: String::Language lang;
100: if(params.count()==1)
101: lang=String::L_AS_IS; // mark as simply 'tainted'. useful in html from sql
1.59 paf 102: else {
1.129 paf 103: const String& lang_name=params.as_string(0, "lang must be string");
104: lang=untaint_lang_name2enum.get(lang_name);
1.59 paf 105: if(!lang)
1.78 paf 106: throw Exception(0,
1.59 paf 107: &lang_name,
108: "invalid taint language");
109: }
1.1 paf 110:
111: {
1.129 paf 112: Value& vbody=params.as_junction(params.count()-1, "body must be code");
1.1 paf 113:
114: Temp_lang temp_lang(r, lang); // set temporarily specified ^untaint[language;
1.86 paf 115: r.write_pass_lang(r.process(vbody)); // process marking tainted with that lang
1.1 paf 116: }
117: }
118:
1.129 paf 119: static void _taint(Request& r, MethodParams& params) {
120: String::Language lang;
121: if(params.count()==1)
122: lang=String::L_TAINTED; // mark as simply 'tainted'. useful in table:set
1.1 paf 123: else {
1.129 paf 124: const String& lang_name=params.as_string(0, "lang must be string");
125: lang=untaint_lang_name2enum.get(lang_name);
1.1 paf 126: if(!lang)
1.78 paf 127: throw Exception(0,
1.3 paf 128: &lang_name,
129: "invalid taint language");
1.1 paf 130: }
131:
132: {
1.129 paf 133: Value& vbody=params.as_no_junction(params.count()-1, "body must not be code");
1.1 paf 134:
1.129 paf 135: String result;
1.1 paf 136: result.append(
137: vbody.as_string(), // process marking tainted with that lang
138: lang, true); // force result language to specified
139: r.write_pass_lang(result);
140: }
141: }
142:
1.129 paf 143: static void _process(Request& r, MethodParams& params) {
144: Method* main_method;
145:
146: size_t index=0;
147: Value* target_self;
148: Value& maybe_target_self=params[index];
149: if(maybe_target_self.get_string() || maybe_target_self.get_junction())
150: target_self=&r.get_method_frame()->caller()->self();
151: else {
152: target_self=&maybe_target_self; index++;
153: }
154:
1.1 paf 155: {
1.129 paf 156: VStateless_class *target_class=target_self->get_last_derived_class();
1.116 paf 157: if(!target_class)
158: throw Exception("parser.runtime",
1.129 paf 159: 0,
1.116 paf 160: "no target class");
1.114 paf 161:
1.73 paf 162: // temporary remove language change
1.129 paf 163: Temp_lang temp_lang(r, String::L_PASS_APPENDED);
1.1 paf 164: // temporary zero @main so to maybe-replace it in processed code
1.129 paf 165: Temp_method temp_method_main(*target_class, main_method_name, 0);
1.1 paf 166: // temporary zero @auto so it wouldn't be auto-called in Request::use_buf
1.129 paf 167: Temp_method temp_method_auto(*target_class, auto_method_name, 0);
168:
1.146 ! paf 169: size_t options_index=index+1;
! 170: HashStringValue* options=0;
! 171: if(options_index<params.count()) {
! 172: Value& voptions=params.as_no_junction(options_index, "options must not be code");
! 173: options=voptions.get_hash();
! 174: if(!options)
! 175: throw Exception("parser.runtime",
! 176: 0,
! 177: "options must be hash");
! 178: }
! 179:
1.129 paf 180: const String* main_alias=0;
1.146 ! paf 181: const String* file_alias=0;
! 182: int line_no_alias_offset=0;
! 183: if(options) {
! 184: int valid_options=0;
! 185: if(Value* vmain_alias=options->get(PROCESS_MAIN_OPTION_NAME)) {
! 186: valid_options++;
! 187: main_alias=&vmain_alias->as_string();
! 188: }
! 189: if(Value* vfile_alias=options->get(PROCESS_FILE_OPTION_NAME)) {
! 190: valid_options++;
! 191: file_alias=&vfile_alias->as_string();
! 192: }
! 193: if(Value* vline_no_alias_offset=options->get(PROCESS_LINENO_OPTION_NAME)) {
! 194: valid_options++;
! 195: line_no_alias_offset=vline_no_alias_offset->as_int();
! 196: }
! 197:
! 198: if(valid_options!=options->count())
! 199: throw Exception("parser.runtime",
! 200: 0,
! 201: "called with invalid option");
! 202: }
1.129 paf 203:
1.146 ! paf 204: uint processe_file_no=file_alias?
! 205: r.register_file(r.absolute(*file_alias))
! 206: : pseudo_file_no__process;
! 207: // process...{string}
! 208: Value& vjunction=params.as_junction(index, "body must be code");
! 209: // evaluate source to process
! 210: const String& source=r.process_to_string(vjunction);
! 211: r.use_buf(*target_class,
! 212: source.cstr(String::L_UNSPECIFIED, r.connection(false)),
! 213: main_alias,
! 214: processe_file_no,
! 215: line_no_alias_offset);
1.1 paf 216:
1.73 paf 217: // main_method
1.129 paf 218: main_method=target_class->get_method(main_method_name);
1.73 paf 219: }
220: // after restoring current-request-lang
221: // maybe-execute @main[]
222: if(main_method) {
1.119 paf 223: // temporarily set method_frame's self to target_self
1.129 paf 224: Temp_method_frame_self tmfs(*r.get_method_frame(), *target_self);
1.73 paf 225: // execute!
226: r.execute(*main_method->parser_code);
1.1 paf 227: }
228: }
229:
1.138 paf 230: static void _rem(Request&, MethodParams& params) {
1.129 paf 231: params.as_junction(0, "body must be code");
1.1 paf 232: }
233:
1.129 paf 234: static void _while(Request& r, MethodParams& params) {
235: Value& vcondition=params.as_junction(0, "condition must be expression");
236: Value& body=params.as_junction(1, "body must be code");
1.1 paf 237:
238: // while...
239: int endless_loop_count=0;
240: while(true) {
1.18 parser 241: if(++endless_loop_count>=MAX_LOOPS) // endless loop?
1.78 paf 242: throw Exception("parser.runtime",
1.129 paf 243: 0,
1.1 paf 244: "endless loop detected");
245:
1.86 paf 246: bool condition=r.process_to_value(vcondition,
1.1 paf 247: false/*don't intercept string*/).as_bool();
248: if(!condition) // ...condition is true
249: break;
250:
251: // write processed body
1.86 paf 252: r.write_pass_lang(r.process(body));
1.1 paf 253: }
254: }
255:
1.129 paf 256: static void _use(Request& r, MethodParams& params) {
257: Value& vfile=params.as_no_junction(0, "file name must not be code");
1.113 paf 258: r.use_file(r.main_class, vfile.as_string());
1.1 paf 259: }
260:
1.129 paf 261: static void _for(Request& r, MethodParams& params) {
262: const String& var_name=params.as_string(0, "var name must be string");
263: int from=params.as_int(1, "from must be int", r);
264: int to=params.as_int(2, "to must be int", r);
265: Value& body_code=params.as_junction(3, "body must be code");
266: Value* delim_maybe_code=params.count()>4?¶ms[4]:0;
1.1 paf 267:
1.57 paf 268: if(to-from>=MAX_LOOPS) // too long loop?
1.78 paf 269: throw Exception("parser.runtime",
1.129 paf 270: 0,
1.57 paf 271: "endless loop detected");
272:
1.1 paf 273: bool need_delim=false;
1.129 paf 274: VInt* vint=new VInt(0);
1.117 paf 275: r.get_method_frame()->caller()->put_element(var_name, vint, false);
1.1 paf 276: for(int i=from; i<=to; i++) {
277: vint->set_int(i);
278:
1.108 paf 279: StringOrValue sv_processed=r.process(body_code);
1.129 paf 280: const String* s_processed=sv_processed.get_string();
281: if(delim_maybe_code && s_processed && s_processed->length()) { // delimiter set and we have body
1.108 paf 282: if(need_delim) // need delim & iteration produced string?
1.86 paf 283: r.write_pass_lang(r.process(*delim_maybe_code));
1.1 paf 284: need_delim=true;
285: }
1.108 paf 286: r.write_pass_lang(sv_processed);
1.1 paf 287: }
288: }
289:
1.129 paf 290: static void _eval(Request& r, MethodParams& params) {
291: Value& expr=params.as_junction(0, "need expression");
1.1 paf 292: // evaluate expresion
1.129 paf 293: Value& value_result=r.process_to_value(expr,
1.1 paf 294: true/*don't intercept string*/).as_expr_result();
1.129 paf 295: if(params.count()>1) {
296: Value& fmt=params.as_no_junction(1, "fmt must not be code");
297: r.write_no_lang(String(format(value_result.as_double(), fmt.as_string().cstrm())));
1.91 paf 298: } else
1.129 paf 299: r.write_no_lang(value_result);
1.1 paf 300: }
301:
1.129 paf 302: static void _connect(Request& r, MethodParams& params) {
1.63 paf 303: #ifdef RESOURCES_DEBUG
304: struct timeval mt[2];
305: #endif
1.129 paf 306: Value& url=params.as_no_junction(0, "url must not be code");
307: Value& body_code=params.as_junction(1, "body must be code");
1.1 paf 308:
1.129 paf 309: Table* protocol2driver_and_client=0;
310: if(Value* sql=r.main_class.get_element(String(MAIN_SQL_NAME), r.main_class, false)) {
311: if(Value* element=sql->get_element(String(MAIN_SQL_DRIVERS_NAME), *sql, false)) {
1.113 paf 312: protocol2driver_and_client=element->get_table();
313: }
314: }
1.11 paf 315:
1.63 paf 316: #ifdef RESOURCES_DEBUG
317: //measure:before
318: gettimeofday(&mt[0],NULL);
319: #endif
1.1 paf 320: // connect
1.142 paf 321: SQL_Connection* connection=SQL_driver_manager->get_connection(url.as_string(),
1.144 paf 322: protocol2driver_and_client,
323: r.charsets.source().NAME().cstr());
1.1 paf 324:
1.63 paf 325: #ifdef RESOURCES_DEBUG
326: //measure:after connect
327: gettimeofday(&mt[1],NULL);
328:
329: double t[2];
330: for(int i=0;i<2;i++)
331: t[i]=mt[i].tv_sec+mt[i].tv_usec/1000000.0;
332:
333: r.sql_connect_time+=t[1]-t[0];
334: #endif
1.129 paf 335: Temp_connection temp_connection(r, connection);
1.1 paf 336: // execute body
1.53 parser 337: try {
1.86 paf 338: r.write_assign_lang(r.process(body_code));
1.129 paf 339: connection->commit();
340: connection->close();
1.75 paf 341: } catch(...) { // process problem
1.129 paf 342: connection->rollback();
343: connection->close();
344: rethrow;
1.1 paf 345: }
346: }
347:
1.41 parser 348: #ifndef DOXYGEN
1.129 paf 349: class Switch_data: public PA_Object {
350: public:
351: Request& r;
352: Value& searching;
353: Value* found;
354: Value* _default;
355: public:
356: Switch_data(Request& ar, Value& asearching):
357: r(ar), searching(asearching) {}
1.28 parser 358: };
1.41 parser 359: #endif
1.129 paf 360: static void _switch(Request& r, MethodParams& params) {
361: Switch_data* data=new Switch_data(r, r.process_to_value(params[0]));
1.135 paf 362: Temp_hash_value<const String::Body, void*>
1.129 paf 363: switch_data_setter(r.classes_conf, switch_data_name, data);
1.28 parser 364:
1.129 paf 365: Value& cases_code=params.as_junction(1, "switch cases must be code");
1.82 paf 366: // execution of found ^case[...]{code} must be in context of ^switch[...]{code}
367: // because of stacked WWrapper used there as wcontext
1.84 paf 368: r.process(cases_code, true/*intercept_string*/);
1.129 paf 369: if(Value* selected_code=data->found? data->found: data->_default) {
1.83 paf 370: // setting code context, would execute in ^switch[...]{>>context<<}
1.105 paf 371: //selected_code->get_junction()->change_context(cases_code.get_junction());
1.107 paf 372: r.write_pass_lang(r.process(*selected_code));
1.83 paf 373: }
1.28 parser 374: }
375:
1.129 paf 376: static void _case(Request& r, MethodParams& params) {
377: Switch_data* data=static_cast<Switch_data*>(r.classes_conf.get(switch_data_name));
1.38 parser 378: if(!data)
1.78 paf 379: throw Exception("parser.runtime",
1.129 paf 380: 0,
1.38 parser 381: "without switch");
1.28 parser 382:
1.129 paf 383: int count=params.count();
384: Value& code=params.as_junction(--count, "case result must be code");
1.83 paf 385:
386: // killing context for safety, would execute in ^switch[...]{>>context<<}
387: // reason: context is stacked, and it would become invalid afterwards
1.105 paf 388: //code->get_junction()->change_context(0);
1.83 paf 389:
1.28 parser 390: for(int i=0; i<count; i++) {
1.129 paf 391: Value& value=r.process_to_value(params[i]);
1.28 parser 392:
1.82 paf 393: if(value.as_string() == CASE_DEFAULT_VALUE) {
1.129 paf 394: data->_default=&code;
1.28 parser 395: break;
396: }
397:
398: bool matches;
1.129 paf 399: if(data->searching.is_string())
400: matches=data->searching.as_string() == value.as_string();
1.28 parser 401: else
1.129 paf 402: matches=data->searching.as_double() == value.as_double();
1.28 parser 403:
404: if(matches) {
1.82 paf 405: if(data->found)
406: throw Exception("parser.runtime",
1.129 paf 407: 0,
1.82 paf 408: "duplicate found");
409:
1.129 paf 410: data->found=&code;
1.28 parser 411: break;
412: }
413: }
414: }
1.136 paf 415: #ifndef DOXYGEN
416: struct Try_catch_result {
417: StringOrValue processed_code;
418: const String* exception_should_be_handled;
419:
420: Try_catch_result(): exception_should_be_handled(0) {}
421: };
422: #endif
423:
424: /// used by ^try and ^cache, @returns $exception.handled[string] if any
425: template<class I>
426: static Try_catch_result try_catch(Request& r,
427: StringOrValue body_code(Request&, I), I info,
428: Value* catch_code)
429: {
430: Try_catch_result result;
431: if(!catch_code) {
432: result.processed_code=body_code(r, info);
433: return result;
434: }
435:
436: // taking snapshot of try-context
437: Request_context_saver try_context(r);
438: try {
439: result.processed_code=body_code(r, info);
440: } catch(const Exception& e) {
441: Request_context_saver throw_context(r); // taking snapshot of throw-context [stack trace contains error]
442: Request::Exception_details details=r.get_details(e);
443: try_context.restore(); // restoring try-context to perform catch-code
444:
445: Junction* junction=catch_code->get_junction();
446: Value* method_frame=junction->method_frame;
447: Value* saved_exception_var_value=method_frame->get_element(exception_var_name, *method_frame, false);
448: junction->method_frame->put_element(exception_var_name, &details.vhash, false);
449: result.processed_code=r.process(*catch_code);
450:
451: // retriving $exception.handled, restoring $exception var
452: Value* vhandled=details.vhash.hash().get(exception_handled_part_name);
453: junction->method_frame->put_element(exception_var_name, saved_exception_var_value, false);
454:
455: bool bhandled=false;
456: if(vhandled) {
457: if(vhandled->is_string()) { // not simple $exception.handled(1/0)?
458: result.exception_should_be_handled=vhandled->get_string(); // considering 'recovered' and let the caller recover
459: return result;
460: }
461:
462: bhandled=vhandled->as_bool();
463: }
464:
465: if(!bhandled) {
466: throw_context.restore(); // restoring throw-context [exception were not handled]
467: rethrow;
468: }
469: }
470: return result;
471: }
1.28 parser 472:
1.63 paf 473: // cache--
474:
475: // consts
476:
1.131 paf 477: const int DATA_STRING_SERIALIZED_VERSION=0x0005;
1.63 paf 478:
479: // helper types
480:
481: #ifndef DOXYGEN
482: struct Data_string_serialized_prolog {
483: int version;
1.79 paf 484: time_t expires;
1.63 paf 485: };
486: #endif
487:
1.68 paf 488: void cache_delete(const String& file_spec) {
489: file_delete(file_spec, false/*fail_on_read_problem*/);
1.63 paf 490: }
1.69 paf 491:
492: #ifndef DOXYGEN
1.135 paf 493: struct Cache_scope {
1.129 paf 494: public:
1.79 paf 495: time_t expires;
1.135 paf 496: const String* body_from_disk;
1.79 paf 497: };
1.69 paf 498: struct Locked_process_and_cache_put_action_info {
499: Request *r;
1.136 paf 500: Cache_scope *scope;
501: Value* body_code; Value* catch_code;
502: const String* processed_code;
1.69 paf 503: };
504: #endif
1.136 paf 505:
506:
507:
508: static StringOrValue process_cache_body_code(Request& r, Value* body_code) {
509: return StringOrValue(&r.process_to_string(*body_code), 0);
510: }
511:
1.129 paf 512: /* @todo maybe network order worth spending some effort?
513: don't bothering myself with network byte order,
514: am not planning to be able to move resulting file across platforms
515: */
1.69 paf 516: static void locked_process_and_cache_put_action(int f, void *context) {
517: Locked_process_and_cache_put_action_info& info=
518: *static_cast<Locked_process_and_cache_put_action_info *>(context);
1.129 paf 519:
1.69 paf 520: // body->process
1.136 paf 521: Try_catch_result result=try_catch(*info.r,
522: process_cache_body_code, info.body_code,
523: info.catch_code);
524:
525: if(result.exception_should_be_handled) {
526: if(*result.exception_should_be_handled==CACHE_EXCEPTION_HANDLED_CACHE_NAME) {
527: if(const String* body_from_disk=info.scope->body_from_disk) // we have something old?
528: info.processed_code=body_from_disk;
529: else
530: throw Exception(0,
531: new String("$"EXCEPTION_VAR_NAME"."EXCEPTION_HANDLED_PART_NAME"["CACHE_EXCEPTION_HANDLED_CACHE_NAME"]"),
532: "fallback failed - there is no old cached body");
533: } else
534: throw Exception("parser.runtime",
535: result.exception_should_be_handled,
536: "$"EXCEPTION_VAR_NAME"."EXCEPTION_HANDLED_PART_NAME" value must be "
537: "either boolean or string '"CACHE_EXCEPTION_HANDLED_CACHE_NAME"'");
538: } else
539: info.processed_code=&result.processed_code.as_string();
1.69 paf 540:
1.79 paf 541: // expiration time not spoiled by ^cache(0) or something?
1.136 paf 542: if(info.scope->expires > time(0)) {
1.79 paf 543: // string -serialize> buffer
1.136 paf 544: String::Cm serialized=info.processed_code->serialize(
1.129 paf 545: sizeof(Data_string_serialized_prolog));
1.79 paf 546: Data_string_serialized_prolog& prolog=
1.129 paf 547: *reinterpret_cast<Data_string_serialized_prolog *>(serialized.str);
1.79 paf 548: prolog.version=DATA_STRING_SERIALIZED_VERSION;
1.136 paf 549: prolog.expires=info.scope->expires;
1.79 paf 550:
551: // buffer -write> file
1.129 paf 552: write(f, serialized.str, serialized.length);
1.79 paf 553: } else // expired!
1.136 paf 554: info.scope->expires=0; // flag it so that could be easily checked by caller
1.69 paf 555: }
1.129 paf 556: const String* locked_process_and_cache_put(Request& r,
1.128 paf 557: Value& body_code,
1.136 paf 558: Value* catch_code,
559: Cache_scope& scope,
560: const String& file_spec)
561: {
1.140 paf 562: Locked_process_and_cache_put_action_info info={&r, &scope, &body_code, catch_code, 0};
1.69 paf 563:
1.129 paf 564: const String* result=file_write_action_under_lock(
1.69 paf 565: file_spec,
566: "cache_put", locked_process_and_cache_put_action, &info,
567: false/*as_text*/,
568: false/*do_append*/,
1.96 paf 569: false/*block*/,
1.136 paf 570: false/*fail on lock problem*/) ? info.processed_code: 0;
1.100 paf 571: time_t now=time(0);
1.136 paf 572: if(scope.expires<=now)
1.79 paf 573: cache_delete(file_spec);
574: return result;
1.63 paf 575: }
1.137 paf 576: #ifndef DOXYGEN
1.135 paf 577: struct Cache_get_result {
578: const String* body;
579: bool expired;
1.137 paf 580: };
581: #endif
582: static Cache_get_result cache_get(Request_charsets& charsets, const String& file_spec, time_t now) {
1.140 paf 583: Cache_get_result result={0, false};
1.135 paf 584:
1.129 paf 585: File_read_result file=file_read(charsets, file_spec,
1.63 paf 586: false/*as_text*/,
1.129 paf 587: 0, //no params
588: false/*fail_on_read_problem*/);
589: if(file.success && file.length/* ignore reads which are empty due to
1.72 paf 590: non-unary open+lockEX conflict with lockSH */) {
1.129 paf 591:
1.72 paf 592: Data_string_serialized_prolog& prolog=
1.129 paf 593: *reinterpret_cast<Data_string_serialized_prolog *>(file.str);
1.63 paf 594:
1.135 paf 595: String* body=new String;
1.72 paf 596: if(
1.129 paf 597: file.length>=sizeof(Data_string_serialized_prolog)
1.135 paf 598: && prolog.version==DATA_STRING_SERIALIZED_VERSION) {
599: if(body->deserialize(sizeof(Data_string_serialized_prolog), file.str, file.length)) {
600: result.body=body;
601: result.expired=prolog.expires <= now;
602: }
603: }
1.72 paf 604: }
1.63 paf 605:
1.135 paf 606: return result;
1.63 paf 607: }
1.129 paf 608: static time_t as_expires(Request& r, MethodParams& params,
1.79 paf 609: int index, time_t now) {
610: time_t result;
1.129 paf 611: if(Value* vdate=params[index].as(VDATE_TYPE, false))
612: result=static_cast<VDate*>(vdate)->get_time();
1.79 paf 613: else
1.129 paf 614: result=now+(time_t)params.as_double(index, "lifespan must be date or number", r);
1.79 paf 615:
616: return result;
617: }
1.129 paf 618: static const String& as_file_spec(Request& r, MethodParams& params, int index) {
619: return r.absolute(params.as_string(index, "filespec must be string"));
1.79 paf 620: }
1.129 paf 621: static void _cache(Request& r, MethodParams& params) {
1.79 paf 622: time_t now=time(0);
623:
624: // ^cache[filename] ^cache(seconds) ^cache[expires date]
1.129 paf 625: if(params.count()==1) {
626: if(params[0].is_string()) { // filename?
1.79 paf 627: cache_delete(as_file_spec(r, params, 0));
628: return;
629: }
630:
631: // secods|expires date
1.135 paf 632: Cache_scope* scope=static_cast<Cache_scope*>(r.classes_conf.get(cache_data_name));
633: if(!scope)
1.79 paf 634: throw Exception("parser.runtime",
1.129 paf 635: 0,
1.79 paf 636: "expire-time reducing instruction without cache");
637:
1.129 paf 638: time_t expires=as_expires(r, params, 0, now);
1.135 paf 639: if(expires < scope->expires)
640: scope->expires=expires;
1.79 paf 641:
642: return;
643: }
1.63 paf 644:
645: // file_spec, expires, body code
1.129 paf 646: const String& file_spec=r.absolute(params.as_string(0, "filespec must be string"));
1.65 paf 647:
1.141 paf 648: Cache_scope scope={as_expires(r, params, 1, now), 0};
1.135 paf 649:
650: Temp_hash_value<const String::Body, void*>
651: cache_scope_setter(r.classes_conf, cache_data_name, &scope);
1.136 paf 652: Value& body_code=params.as_junction(2, "body_code must be code");
653: Value* catch_code=0;
654: if(params.count()>3)
655: catch_code=¶ms.as_junction(3, "catch_code must be code");
1.63 paf 656:
1.135 paf 657: if(scope.expires>now) { // valid 'expires' specified? try cached copy...
1.69 paf 658: // hence we don't hope to have unary create/lockEX
659: // we need some plan to live in a life like that, so...
660: // worst races plan:
661: // A B
662: // open
663: // |open
664: // lockSH
665: // |nonblocking-lockEX fails
666: // unlockSH
667: // close, cache_get returns 0
668: // open
669: // nonblocking-lockEX succeeds; process, write, close
670: // |retry1: open
671: // ...
672: // |lockSH succeeds; ...
673:
674: for(int retry=0; retry<2; retry++) {
1.135 paf 675: Cache_get_result cached=cache_get(r.charsets, file_spec, now);
1.136 paf 676: if(cached.body) { // have cached copy
1.135 paf 677: if(cached.expired)
678: scope.body_from_disk=cached.body; // storing for user to retrive it with ^cache[]
1.136 paf 679: else // and it's not expired yet
680: {
1.135 paf 681: // write it out
682: r.write_assign_lang(*cached.body);
683: // happy with it
684: return;
685: }
1.79 paf 686: }
1.69 paf 687:
1.135 paf 688: // non-blocked lock; process; cache it
689: if(const String* processed_body=
1.136 paf 690: locked_process_and_cache_put(r, body_code, catch_code, scope, file_spec)) {
1.135 paf 691: // write it out
692: r.write_assign_lang(*processed_body);
693: // happy with it
694: return;
695: } else { // somebody writing result right now
696: pa_sleep(0, 500000); // waiting half a second
697: retry=0; // prolonging our wait, than could cache_get it, without processing body_code
698: }
1.69 paf 699: }
1.78 paf 700: throw Exception(0,
1.69 paf 701: &file_spec,
702: "locking problem");
703: } else {
1.79 paf 704: // instructed not to cache; forget cached copy
1.68 paf 705: cache_delete(file_spec);
1.69 paf 706: // process
1.81 paf 707: const String& processed_body=r.process_to_string(body_code);
1.69 paf 708: // write it out
709: r.write_assign_lang(processed_body);
710: // happy with it
711: return;
712: }
713: // never reached
1.63 paf 714: }
715:
1.136 paf 716: static StringOrValue process_try_body_code(Request& r, Value* body_code) {
717: return r.process(*body_code);
718: }
1.129 paf 719: static void _try_operator(Request& r, MethodParams& params) {
720: Value& body_code=params.as_junction(0, "body_code must be code");
721: Value& catch_code=params.as_junction(1, "catch_code must be code");
1.74 paf 722:
1.136 paf 723: Try_catch_result result=try_catch(r,
724: process_try_body_code, &body_code,
725: &catch_code);
726:
727: if(result.exception_should_be_handled)
728: throw Exception("parser.runtime",
729: result.exception_should_be_handled,
730: "catch block must set $exception.handled to some boolean value, not string");
1.123 paf 731:
1.136 paf 732: // write out processed body_code or catch_code
733: r.write_pass_lang(result.processed_code);
1.74 paf 734: }
735:
1.138 paf 736: static void _throw_operator(Request&, MethodParams& params) {
1.129 paf 737: if(params.count()==1) {
738: if(HashStringValue *hash=params[0].get_hash()) {
739: const char* type=0;
740: if(Value* value=hash->get(exception_type_part_name))
1.78 paf 741: type=value->as_string().cstr();
1.129 paf 742: const String* source=0;
743: if(Value* value=hash->get(exception_source_part_name))
1.74 paf 744: source=&value->as_string();
1.138 paf 745: const char* comment=0;
1.129 paf 746: if(Value* value=hash->get(exception_comment_part_name))
1.74 paf 747: comment=value->as_string().cstr();
748:
1.78 paf 749: throw Exception(type,
1.129 paf 750: source?source:0,
751: "%s", comment?comment:"");
1.74 paf 752: } else
1.78 paf 753: throw Exception("parser.runtime",
1.129 paf 754: 0,
1.74 paf 755: "one-param version has hash param");
756: } else {
1.129 paf 757: const char* type=params.as_string(0, "type must be string").cstr();
758: const String& source=params.as_string(1, "source must be string");
759: const char* comment=params.count()>2? params.as_string(2, "comment must be string").cstr()
760: :0;
1.97 paf 761: throw Exception(type, &source, "%s", comment?comment:"");
1.74 paf 762: }
1.132 paf 763: }
1.129 paf 764:
765: #if defined(WIN32) && defined(_DEBUG)
766: # define PA_BPT
1.138 paf 767: static void _bpt(Request&, MethodParams&) {
1.129 paf 768: _asm int 3;
769: }
770: #endif
771:
1.10 paf 772: // constructor
773:
1.129 paf 774: VClassMAIN::VClassMAIN(): VClass() {
775: set_name(*new String(MAIN_CLASS_NAME));
776:
777: #ifdef PA_BPT
778: // ^bpt[]
779: add_native_method("bpt", Method::CT_ANY, _bpt, 0, 0);
780: #endif
1.121 paf 781:
1.1 paf 782: // ^if(condition){code-when-true}
783: // ^if(condition){code-when-true}{code-when-false}
1.10 paf 784: add_native_method("if", Method::CT_ANY, _if, 2, 3);
1.1 paf 785:
786: // ^untaint[as-is|uri|sql|js|html|html-typo]{code}
1.59 paf 787: add_native_method("untaint", Method::CT_ANY, _untaint, 1, 2);
1.1 paf 788:
789: // ^taint[as-is|uri|sql|js|html|html-typo]{code}
1.10 paf 790: add_native_method("taint", Method::CT_ANY, _taint, 1, 2);
1.1 paf 791:
792: // ^process[code]
1.146 ! paf 793: add_native_method("process", Method::CT_ANY, _process, 1, 3);
1.1 paf 794:
795: // ^rem{code}
1.51 parser 796: add_native_method("rem", Method::CT_ANY, _rem, 1, 10000);
1.1 paf 797:
798: // ^while(condition){code}
1.10 paf 799: add_native_method("while", Method::CT_ANY, _while, 2, 2);
1.1 paf 800:
801: // ^use[file]
1.10 paf 802: add_native_method("use", Method::CT_ANY, _use, 1, 1);
1.1 paf 803:
1.54 paf 804: // ^for[i](from-number;to-number-inclusive){code}[delim]
1.10 paf 805: add_native_method("for", Method::CT_ANY, _for, 3+1, 3+1+1);
1.1 paf 806:
807: // ^eval(expr)
808: // ^eval(expr)[format]
1.10 paf 809: add_native_method("eval", Method::CT_ANY, _eval, 1, 2);
1.52 parser 810:
1.1 paf 811: // ^connect[protocol://user:pass@host[:port]/database]{code with ^sql-s}
1.10 paf 812: add_native_method("connect", Method::CT_ANY, _connect, 2, 2);
813:
1.63 paf 814:
1.136 paf 815: // ^cache[file_spec](time){code}[{catch code}] time=0 no cache
1.65 paf 816: // ^cache[file_spec] delete cache
1.136 paf 817: add_native_method("cache", Method::CT_ANY, _cache, 1, 4);
1.63 paf 818:
1.28 parser 819: // switch
820:
821: // ^switch[value]{cases}
822: add_native_method("switch", Method::CT_ANY, _switch, 2, 2);
823:
824: // ^case[value]{code}
1.51 parser 825: add_native_method("case", Method::CT_ANY, _case, 2, 10000);
1.74 paf 826:
827: // try-catch
828:
829: // ^try{code}{catch code}
830: add_native_method("try", Method::CT_ANY, _try_operator, 2, 2);
831: // ^throw[$exception hash]
832: // ^throw[type;source;comment]
833: add_native_method("throw", Method::CT_ANY, _throw_operator, 1, 3);
834:
1.10 paf 835: }
1.11 paf 836:
837: // constructor & configurator
1.1 paf 838:
1.129 paf 839: VStateless_class& VClassMAIN_create() {
840: return *new VClassMAIN;
1.1 paf 841: }
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