Annotation of parser3/src/classes/op.C, revision 1.161
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:
1.161 ! paf 8: static const char * const IDENT_OP_C="$Date: 2005/11/22 15:38:17 $";
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);
1.159 paf 79: ULN("regex", REGEX);
1.129 paf 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) {
1.156 paf 87: bool condition=params.as_bool(0, "condition must be expression", r);
1.6 paf 88: if(condition)
1.156 paf 89: r.write_pass_lang(r.process(*params.get(1)));
1.129 paf 90: else if(params.count()>2)
1.156 paf 91: r.write_pass_lang(r.process(*params.get(2)));
1.1 paf 92: }
93:
1.129 paf 94: static void _untaint(Request& r, MethodParams& params) {
1.1 paf 95:
1.129 paf 96: String::Language lang;
97: if(params.count()==1)
98: lang=String::L_AS_IS; // mark as simply 'tainted'. useful in html from sql
1.59 paf 99: else {
1.129 paf 100: const String& lang_name=params.as_string(0, "lang must be string");
101: lang=untaint_lang_name2enum.get(lang_name);
1.59 paf 102: if(!lang)
1.78 paf 103: throw Exception(0,
1.59 paf 104: &lang_name,
105: "invalid taint language");
106: }
1.1 paf 107:
108: {
1.129 paf 109: Value& vbody=params.as_junction(params.count()-1, "body must be code");
1.1 paf 110:
111: Temp_lang temp_lang(r, lang); // set temporarily specified ^untaint[language;
1.86 paf 112: r.write_pass_lang(r.process(vbody)); // process marking tainted with that lang
1.1 paf 113: }
114: }
115:
1.129 paf 116: static void _taint(Request& r, MethodParams& params) {
117: String::Language lang;
118: if(params.count()==1)
119: lang=String::L_TAINTED; // mark as simply 'tainted'. useful in table:set
1.1 paf 120: else {
1.129 paf 121: const String& lang_name=params.as_string(0, "lang must be string");
122: lang=untaint_lang_name2enum.get(lang_name);
1.1 paf 123: if(!lang)
1.78 paf 124: throw Exception(0,
1.3 paf 125: &lang_name,
126: "invalid taint language");
1.1 paf 127: }
128:
129: {
1.129 paf 130: Value& vbody=params.as_no_junction(params.count()-1, "body must not be code");
1.1 paf 131:
1.129 paf 132: String result;
1.1 paf 133: result.append(
134: vbody.as_string(), // process marking tainted with that lang
135: lang, true); // force result language to specified
136: r.write_pass_lang(result);
137: }
138: }
139:
1.129 paf 140: static void _process(Request& r, MethodParams& params) {
141: Method* main_method;
142:
143: size_t index=0;
144: Value* target_self;
145: Value& maybe_target_self=params[index];
146: if(maybe_target_self.get_string() || maybe_target_self.get_junction())
147: target_self=&r.get_method_frame()->caller()->self();
148: else {
149: target_self=&maybe_target_self; index++;
150: }
151:
1.1 paf 152: {
1.129 paf 153: VStateless_class *target_class=target_self->get_last_derived_class();
1.116 paf 154: if(!target_class)
155: throw Exception("parser.runtime",
1.129 paf 156: 0,
1.116 paf 157: "no target class");
1.114 paf 158:
1.73 paf 159: // temporary remove language change
1.129 paf 160: Temp_lang temp_lang(r, String::L_PASS_APPENDED);
1.1 paf 161: // temporary zero @main so to maybe-replace it in processed code
1.129 paf 162: Temp_method temp_method_main(*target_class, main_method_name, 0);
1.1 paf 163: // temporary zero @auto so it wouldn't be auto-called in Request::use_buf
1.129 paf 164: Temp_method temp_method_auto(*target_class, auto_method_name, 0);
165:
1.146 paf 166: size_t options_index=index+1;
167: HashStringValue* options=0;
168: if(options_index<params.count()) {
169: Value& voptions=params.as_no_junction(options_index, "options must not be code");
170: options=voptions.get_hash();
171: if(!options)
172: throw Exception("parser.runtime",
173: 0,
174: "options must be hash");
175: }
176:
1.129 paf 177: const String* main_alias=0;
1.146 paf 178: const String* file_alias=0;
179: int line_no_alias_offset=0;
180: if(options) {
181: int valid_options=0;
182: if(Value* vmain_alias=options->get(PROCESS_MAIN_OPTION_NAME)) {
183: valid_options++;
184: main_alias=&vmain_alias->as_string();
185: }
186: if(Value* vfile_alias=options->get(PROCESS_FILE_OPTION_NAME)) {
187: valid_options++;
188: file_alias=&vfile_alias->as_string();
189: }
190: if(Value* vline_no_alias_offset=options->get(PROCESS_LINENO_OPTION_NAME)) {
191: valid_options++;
192: line_no_alias_offset=vline_no_alias_offset->as_int();
193: }
194:
195: if(valid_options!=options->count())
196: throw Exception("parser.runtime",
197: 0,
198: "called with invalid option");
199: }
1.129 paf 200:
1.146 paf 201: uint processe_file_no=file_alias?
202: r.register_file(r.absolute(*file_alias))
203: : pseudo_file_no__process;
204: // process...{string}
205: Value& vjunction=params.as_junction(index, "body must be code");
206: // evaluate source to process
207: const String& source=r.process_to_string(vjunction);
208: r.use_buf(*target_class,
209: source.cstr(String::L_UNSPECIFIED, r.connection(false)),
210: main_alias,
211: processe_file_no,
212: line_no_alias_offset);
1.1 paf 213:
1.73 paf 214: // main_method
1.129 paf 215: main_method=target_class->get_method(main_method_name);
1.73 paf 216: }
217: // after restoring current-request-lang
218: // maybe-execute @main[]
219: if(main_method) {
1.119 paf 220: // temporarily set method_frame's self to target_self
1.129 paf 221: Temp_method_frame_self tmfs(*r.get_method_frame(), *target_self);
1.73 paf 222: // execute!
223: r.execute(*main_method->parser_code);
1.1 paf 224: }
225: }
226:
1.138 paf 227: static void _rem(Request&, MethodParams& params) {
1.129 paf 228: params.as_junction(0, "body must be code");
1.1 paf 229: }
230:
1.129 paf 231: static void _while(Request& r, MethodParams& params) {
232: Value& vcondition=params.as_junction(0, "condition must be expression");
233: Value& body=params.as_junction(1, "body must be code");
1.1 paf 234:
235: // while...
236: int endless_loop_count=0;
237: while(true) {
1.18 parser 238: if(++endless_loop_count>=MAX_LOOPS) // endless loop?
1.78 paf 239: throw Exception("parser.runtime",
1.129 paf 240: 0,
1.1 paf 241: "endless loop detected");
242:
1.86 paf 243: bool condition=r.process_to_value(vcondition,
1.1 paf 244: false/*don't intercept string*/).as_bool();
245: if(!condition) // ...condition is true
246: break;
247:
248: // write processed body
1.86 paf 249: r.write_pass_lang(r.process(body));
1.1 paf 250: }
251: }
252:
1.129 paf 253: static void _use(Request& r, MethodParams& params) {
254: Value& vfile=params.as_no_junction(0, "file name must not be code");
1.113 paf 255: r.use_file(r.main_class, vfile.as_string());
1.1 paf 256: }
257:
1.129 paf 258: static void _for(Request& r, MethodParams& params) {
259: const String& var_name=params.as_string(0, "var name must be string");
260: int from=params.as_int(1, "from must be int", r);
261: int to=params.as_int(2, "to must be int", r);
262: Value& body_code=params.as_junction(3, "body must be code");
263: Value* delim_maybe_code=params.count()>4?¶ms[4]:0;
1.1 paf 264:
1.57 paf 265: if(to-from>=MAX_LOOPS) // too long loop?
1.78 paf 266: throw Exception("parser.runtime",
1.129 paf 267: 0,
1.57 paf 268: "endless loop detected");
269:
1.1 paf 270: bool need_delim=false;
1.129 paf 271: VInt* vint=new VInt(0);
1.154 paf 272:
273: VMethodFrame& caller=*r.get_method_frame()->caller();
274: caller.put_element(caller, var_name, vint, false);
1.1 paf 275: for(int i=from; i<=to; i++) {
276: vint->set_int(i);
277:
1.108 paf 278: StringOrValue sv_processed=r.process(body_code);
1.129 paf 279: const String* s_processed=sv_processed.get_string();
280: if(delim_maybe_code && s_processed && s_processed->length()) { // delimiter set and we have body
1.108 paf 281: if(need_delim) // need delim & iteration produced string?
1.86 paf 282: r.write_pass_lang(r.process(*delim_maybe_code));
1.1 paf 283: need_delim=true;
284: }
1.108 paf 285: r.write_pass_lang(sv_processed);
1.1 paf 286: }
287: }
288:
1.129 paf 289: static void _eval(Request& r, MethodParams& params) {
290: Value& expr=params.as_junction(0, "need expression");
1.1 paf 291: // evaluate expresion
1.129 paf 292: Value& value_result=r.process_to_value(expr,
1.1 paf 293: true/*don't intercept string*/).as_expr_result();
1.129 paf 294: if(params.count()>1) {
295: Value& fmt=params.as_no_junction(1, "fmt must not be code");
296: r.write_no_lang(String(format(value_result.as_double(), fmt.as_string().cstrm())));
1.91 paf 297: } else
1.129 paf 298: r.write_no_lang(value_result);
1.1 paf 299: }
300:
1.129 paf 301: static void _connect(Request& r, MethodParams& params) {
1.63 paf 302: #ifdef RESOURCES_DEBUG
303: struct timeval mt[2];
304: #endif
1.129 paf 305: Value& url=params.as_no_junction(0, "url must not be code");
306: Value& body_code=params.as_junction(1, "body must be code");
1.1 paf 307:
1.129 paf 308: Table* protocol2driver_and_client=0;
309: if(Value* sql=r.main_class.get_element(String(MAIN_SQL_NAME), r.main_class, false)) {
310: if(Value* element=sql->get_element(String(MAIN_SQL_DRIVERS_NAME), *sql, false)) {
1.113 paf 311: protocol2driver_and_client=element->get_table();
312: }
313: }
1.11 paf 314:
1.63 paf 315: #ifdef RESOURCES_DEBUG
316: //measure:before
317: gettimeofday(&mt[0],NULL);
318: #endif
1.1 paf 319: // connect
1.142 paf 320: SQL_Connection* connection=SQL_driver_manager->get_connection(url.as_string(),
1.144 paf 321: protocol2driver_and_client,
322: r.charsets.source().NAME().cstr());
1.1 paf 323:
1.63 paf 324: #ifdef RESOURCES_DEBUG
325: //measure:after connect
326: gettimeofday(&mt[1],NULL);
327:
328: double t[2];
329: for(int i=0;i<2;i++)
330: t[i]=mt[i].tv_sec+mt[i].tv_usec/1000000.0;
331:
332: r.sql_connect_time+=t[1]-t[0];
333: #endif
1.129 paf 334: Temp_connection temp_connection(r, connection);
1.1 paf 335: // execute body
1.53 parser 336: try {
1.86 paf 337: r.write_assign_lang(r.process(body_code));
1.129 paf 338: connection->commit();
339: connection->close();
1.75 paf 340: } catch(...) { // process problem
1.129 paf 341: connection->rollback();
342: connection->close();
343: rethrow;
1.1 paf 344: }
345: }
346:
1.41 parser 347: #ifndef DOXYGEN
1.129 paf 348: class Switch_data: public PA_Object {
349: public:
350: Request& r;
351: Value& searching;
352: Value* found;
353: Value* _default;
354: public:
355: Switch_data(Request& ar, Value& asearching):
356: r(ar), searching(asearching) {}
1.28 parser 357: };
1.41 parser 358: #endif
1.129 paf 359: static void _switch(Request& r, MethodParams& params) {
360: Switch_data* data=new Switch_data(r, r.process_to_value(params[0]));
1.135 paf 361: Temp_hash_value<const String::Body, void*>
1.129 paf 362: switch_data_setter(r.classes_conf, switch_data_name, data);
1.28 parser 363:
1.129 paf 364: Value& cases_code=params.as_junction(1, "switch cases must be code");
1.82 paf 365: // execution of found ^case[...]{code} must be in context of ^switch[...]{code}
366: // because of stacked WWrapper used there as wcontext
1.84 paf 367: r.process(cases_code, true/*intercept_string*/);
1.147 paf 368: if(Value* selected_code=data->found? data->found: data->_default)
1.107 paf 369: r.write_pass_lang(r.process(*selected_code));
1.28 parser 370: }
371:
1.129 paf 372: static void _case(Request& r, MethodParams& params) {
373: Switch_data* data=static_cast<Switch_data*>(r.classes_conf.get(switch_data_name));
1.38 parser 374: if(!data)
1.78 paf 375: throw Exception("parser.runtime",
1.129 paf 376: 0,
1.38 parser 377: "without switch");
1.28 parser 378:
1.129 paf 379: int count=params.count();
380: Value& code=params.as_junction(--count, "case result must be code");
1.83 paf 381:
1.28 parser 382: for(int i=0; i<count; i++) {
1.129 paf 383: Value& value=r.process_to_value(params[i]);
1.28 parser 384:
1.157 paf 385: if(value.is_string() && value.as_string() == CASE_DEFAULT_VALUE) {
1.129 paf 386: data->_default=&code;
1.28 parser 387: break;
388: }
389:
390: bool matches;
1.129 paf 391: if(data->searching.is_string())
392: matches=data->searching.as_string() == value.as_string();
1.28 parser 393: else
1.129 paf 394: matches=data->searching.as_double() == value.as_double();
1.28 parser 395:
396: if(matches) {
1.82 paf 397: if(data->found)
398: throw Exception("parser.runtime",
1.129 paf 399: 0,
1.82 paf 400: "duplicate found");
401:
1.129 paf 402: data->found=&code;
1.28 parser 403: break;
404: }
405: }
406: }
1.136 paf 407: #ifndef DOXYGEN
408: struct Try_catch_result {
409: StringOrValue processed_code;
410: const String* exception_should_be_handled;
411:
412: Try_catch_result(): exception_should_be_handled(0) {}
413: };
414: #endif
415:
416: /// used by ^try and ^cache, @returns $exception.handled[string] if any
417: template<class I>
418: static Try_catch_result try_catch(Request& r,
419: StringOrValue body_code(Request&, I), I info,
1.160 paf 420: Value* catch_code, bool could_be_handled_by_caller=false)
1.136 paf 421: {
422: Try_catch_result result;
423: if(!catch_code) {
424: result.processed_code=body_code(r, info);
425: return result;
426: }
427:
428: // taking snapshot of try-context
429: Request_context_saver try_context(r);
430: try {
431: result.processed_code=body_code(r, info);
432: } catch(const Exception& e) {
433: Request_context_saver throw_context(r); // taking snapshot of throw-context [stack trace contains error]
434: Request::Exception_details details=r.get_details(e);
435: try_context.restore(); // restoring try-context to perform catch-code
436:
437: Junction* junction=catch_code->get_junction();
438: Value* method_frame=junction->method_frame;
439: Value* saved_exception_var_value=method_frame->get_element(exception_var_name, *method_frame, false);
1.154 paf 440: VMethodFrame& frame=*junction->method_frame;
441: frame.put_element(frame, exception_var_name, &details.vhash, false);
1.136 paf 442: result.processed_code=r.process(*catch_code);
443:
444: // retriving $exception.handled, restoring $exception var
445: Value* vhandled=details.vhash.hash().get(exception_handled_part_name);
1.154 paf 446: frame.put_element(frame, exception_var_name, saved_exception_var_value, false);
1.136 paf 447:
448: bool bhandled=false;
449: if(vhandled) {
450: if(vhandled->is_string()) { // not simple $exception.handled(1/0)?
1.160 paf 451: if(could_be_handled_by_caller) { // and we can possibly handle it
452: result.exception_should_be_handled=vhandled->get_string(); // considering 'recovered' and let the caller recover
453: return result;
454: }
455:
456: bhandled=false;
457: } else
458: bhandled=vhandled->as_bool();
1.136 paf 459: }
460:
461: if(!bhandled) {
462: throw_context.restore(); // restoring throw-context [exception were not handled]
463: rethrow;
464: }
465: }
466: return result;
467: }
1.28 parser 468:
1.63 paf 469: // cache--
470:
471: // consts
472:
1.152 paf 473: const int DATA_STRING_SERIALIZED_VERSION=0x0006;
1.63 paf 474:
475: // helper types
476:
477: #ifndef DOXYGEN
478: struct Data_string_serialized_prolog {
479: int version;
1.79 paf 480: time_t expires;
1.63 paf 481: };
482: #endif
483:
1.68 paf 484: void cache_delete(const String& file_spec) {
485: file_delete(file_spec, false/*fail_on_read_problem*/);
1.63 paf 486: }
1.69 paf 487:
488: #ifndef DOXYGEN
1.135 paf 489: struct Cache_scope {
1.129 paf 490: public:
1.79 paf 491: time_t expires;
1.135 paf 492: const String* body_from_disk;
1.79 paf 493: };
1.69 paf 494: struct Locked_process_and_cache_put_action_info {
495: Request *r;
1.136 paf 496: Cache_scope *scope;
497: Value* body_code; Value* catch_code;
498: const String* processed_code;
1.69 paf 499: };
500: #endif
1.136 paf 501:
502:
503:
504: static StringOrValue process_cache_body_code(Request& r, Value* body_code) {
1.153 paf 505: return StringOrValue(r.process_to_string(*body_code));
1.136 paf 506: }
507:
1.129 paf 508: /* @todo maybe network order worth spending some effort?
509: don't bothering myself with network byte order,
510: am not planning to be able to move resulting file across platforms
511: */
1.69 paf 512: static void locked_process_and_cache_put_action(int f, void *context) {
513: Locked_process_and_cache_put_action_info& info=
514: *static_cast<Locked_process_and_cache_put_action_info *>(context);
1.129 paf 515:
1.160 paf 516:
517: const String* body_from_disk=info.scope->body_from_disk;
1.69 paf 518: // body->process
1.136 paf 519: Try_catch_result result=try_catch(*info.r,
520: process_cache_body_code, info.body_code,
1.160 paf 521: info.catch_code, body_from_disk!=0 /*we have something old=we can handle=recover later*/);
1.136 paf 522:
523: if(result.exception_should_be_handled) {
524: if(*result.exception_should_be_handled==CACHE_EXCEPTION_HANDLED_CACHE_NAME) {
1.160 paf 525: assert(body_from_disk);
526: info.processed_code=body_from_disk;
1.136 paf 527: } else
528: throw Exception("parser.runtime",
529: result.exception_should_be_handled,
530: "$"EXCEPTION_VAR_NAME"."EXCEPTION_HANDLED_PART_NAME" value must be "
531: "either boolean or string '"CACHE_EXCEPTION_HANDLED_CACHE_NAME"'");
532: } else
533: info.processed_code=&result.processed_code.as_string();
1.69 paf 534:
1.79 paf 535: // expiration time not spoiled by ^cache(0) or something?
1.136 paf 536: if(info.scope->expires > time(0)) {
1.79 paf 537: // string -serialize> buffer
1.136 paf 538: String::Cm serialized=info.processed_code->serialize(
1.129 paf 539: sizeof(Data_string_serialized_prolog));
1.79 paf 540: Data_string_serialized_prolog& prolog=
1.129 paf 541: *reinterpret_cast<Data_string_serialized_prolog *>(serialized.str);
1.79 paf 542: prolog.version=DATA_STRING_SERIALIZED_VERSION;
1.136 paf 543: prolog.expires=info.scope->expires;
1.79 paf 544:
545: // buffer -write> file
1.129 paf 546: write(f, serialized.str, serialized.length);
1.79 paf 547: } else // expired!
1.136 paf 548: info.scope->expires=0; // flag it so that could be easily checked by caller
1.69 paf 549: }
1.129 paf 550: const String* locked_process_and_cache_put(Request& r,
1.128 paf 551: Value& body_code,
1.136 paf 552: Value* catch_code,
553: Cache_scope& scope,
554: const String& file_spec)
555: {
1.140 paf 556: Locked_process_and_cache_put_action_info info={&r, &scope, &body_code, catch_code, 0};
1.69 paf 557:
1.129 paf 558: const String* result=file_write_action_under_lock(
1.69 paf 559: file_spec,
560: "cache_put", locked_process_and_cache_put_action, &info,
561: false/*as_text*/,
562: false/*do_append*/,
1.96 paf 563: false/*block*/,
1.136 paf 564: false/*fail on lock problem*/) ? info.processed_code: 0;
1.100 paf 565: time_t now=time(0);
1.136 paf 566: if(scope.expires<=now)
1.79 paf 567: cache_delete(file_spec);
568: return result;
1.63 paf 569: }
1.137 paf 570: #ifndef DOXYGEN
1.135 paf 571: struct Cache_get_result {
572: const String* body;
573: bool expired;
1.137 paf 574: };
575: #endif
576: static Cache_get_result cache_get(Request_charsets& charsets, const String& file_spec, time_t now) {
1.140 paf 577: Cache_get_result result={0, false};
1.135 paf 578:
1.129 paf 579: File_read_result file=file_read(charsets, file_spec,
1.63 paf 580: false/*as_text*/,
1.129 paf 581: 0, //no params
582: false/*fail_on_read_problem*/);
583: if(file.success && file.length/* ignore reads which are empty due to
1.72 paf 584: non-unary open+lockEX conflict with lockSH */) {
1.129 paf 585:
1.72 paf 586: Data_string_serialized_prolog& prolog=
1.129 paf 587: *reinterpret_cast<Data_string_serialized_prolog *>(file.str);
1.63 paf 588:
1.135 paf 589: String* body=new String;
1.72 paf 590: if(
1.129 paf 591: file.length>=sizeof(Data_string_serialized_prolog)
1.135 paf 592: && prolog.version==DATA_STRING_SERIALIZED_VERSION) {
593: if(body->deserialize(sizeof(Data_string_serialized_prolog), file.str, file.length)) {
594: result.body=body;
595: result.expired=prolog.expires <= now;
596: }
597: }
1.72 paf 598: }
1.63 paf 599:
1.135 paf 600: return result;
1.63 paf 601: }
1.129 paf 602: static time_t as_expires(Request& r, MethodParams& params,
1.79 paf 603: int index, time_t now) {
604: time_t result;
1.129 paf 605: if(Value* vdate=params[index].as(VDATE_TYPE, false))
606: result=static_cast<VDate*>(vdate)->get_time();
1.79 paf 607: else
1.129 paf 608: result=now+(time_t)params.as_double(index, "lifespan must be date or number", r);
1.79 paf 609:
610: return result;
611: }
1.129 paf 612: static const String& as_file_spec(Request& r, MethodParams& params, int index) {
613: return r.absolute(params.as_string(index, "filespec must be string"));
1.79 paf 614: }
1.129 paf 615: static void _cache(Request& r, MethodParams& params) {
1.158 paf 616: if(params.count()==0)
617: {
618: // return current expiration time
619: Cache_scope* scope=static_cast<Cache_scope*>(r.classes_conf.get(cache_data_name));
620: if(!scope)
621: throw Exception("parser.runtime",
622: 0,
623: "expire-time get without cache");
624: r.write_no_lang(*new VDate(scope->expires));
625: return;
626: }
627:
1.79 paf 628: time_t now=time(0);
629:
630: // ^cache[filename] ^cache(seconds) ^cache[expires date]
1.129 paf 631: if(params.count()==1) {
632: if(params[0].is_string()) { // filename?
1.79 paf 633: cache_delete(as_file_spec(r, params, 0));
634: return;
635: }
636:
637: // secods|expires date
1.135 paf 638: Cache_scope* scope=static_cast<Cache_scope*>(r.classes_conf.get(cache_data_name));
639: if(!scope)
1.79 paf 640: throw Exception("parser.runtime",
1.129 paf 641: 0,
1.79 paf 642: "expire-time reducing instruction without cache");
643:
1.129 paf 644: time_t expires=as_expires(r, params, 0, now);
1.135 paf 645: if(expires < scope->expires)
646: scope->expires=expires;
1.79 paf 647:
648: return;
1.149 paf 649: } else if(params.count()<3)
650: throw Exception("parser.runtime",
651: 0,
652: "invalid number of parameters");
1.63 paf 653:
654: // file_spec, expires, body code
1.129 paf 655: const String& file_spec=r.absolute(params.as_string(0, "filespec must be string"));
1.65 paf 656:
1.141 paf 657: Cache_scope scope={as_expires(r, params, 1, now), 0};
1.135 paf 658:
659: Temp_hash_value<const String::Body, void*>
660: cache_scope_setter(r.classes_conf, cache_data_name, &scope);
1.136 paf 661: Value& body_code=params.as_junction(2, "body_code must be code");
662: Value* catch_code=0;
663: if(params.count()>3)
664: catch_code=¶ms.as_junction(3, "catch_code must be code");
1.63 paf 665:
1.135 paf 666: if(scope.expires>now) { // valid 'expires' specified? try cached copy...
1.69 paf 667: // hence we don't hope to have unary create/lockEX
668: // we need some plan to live in a life like that, so...
669: // worst races plan:
670: // A B
671: // open
672: // |open
673: // lockSH
674: // |nonblocking-lockEX fails
675: // unlockSH
676: // close, cache_get returns 0
677: // open
678: // nonblocking-lockEX succeeds; process, write, close
679: // |retry1: open
680: // ...
681: // |lockSH succeeds; ...
682:
683: for(int retry=0; retry<2; retry++) {
1.135 paf 684: Cache_get_result cached=cache_get(r.charsets, file_spec, now);
1.136 paf 685: if(cached.body) { // have cached copy
1.135 paf 686: if(cached.expired)
687: scope.body_from_disk=cached.body; // storing for user to retrive it with ^cache[]
1.136 paf 688: else // and it's not expired yet
689: {
1.135 paf 690: // write it out
691: r.write_assign_lang(*cached.body);
692: // happy with it
693: return;
694: }
1.79 paf 695: }
1.69 paf 696:
1.135 paf 697: // non-blocked lock; process; cache it
698: if(const String* processed_body=
1.136 paf 699: locked_process_and_cache_put(r, body_code, catch_code, scope, file_spec)) {
1.135 paf 700: // write it out
701: r.write_assign_lang(*processed_body);
702: // happy with it
703: return;
704: } else { // somebody writing result right now
705: pa_sleep(0, 500000); // waiting half a second
706: retry=0; // prolonging our wait, than could cache_get it, without processing body_code
707: }
1.69 paf 708: }
1.78 paf 709: throw Exception(0,
1.69 paf 710: &file_spec,
711: "locking problem");
712: } else {
1.79 paf 713: // instructed not to cache; forget cached copy
1.68 paf 714: cache_delete(file_spec);
1.69 paf 715: // process
1.81 paf 716: const String& processed_body=r.process_to_string(body_code);
1.69 paf 717: // write it out
718: r.write_assign_lang(processed_body);
719: // happy with it
720: return;
721: }
722: // never reached
1.63 paf 723: }
724:
1.136 paf 725: static StringOrValue process_try_body_code(Request& r, Value* body_code) {
726: return r.process(*body_code);
727: }
1.129 paf 728: static void _try_operator(Request& r, MethodParams& params) {
729: Value& body_code=params.as_junction(0, "body_code must be code");
730: Value& catch_code=params.as_junction(1, "catch_code must be code");
1.74 paf 731:
1.136 paf 732: Try_catch_result result=try_catch(r,
733: process_try_body_code, &body_code,
734: &catch_code);
735:
736: if(result.exception_should_be_handled)
737: throw Exception("parser.runtime",
738: result.exception_should_be_handled,
739: "catch block must set $exception.handled to some boolean value, not string");
1.123 paf 740:
1.136 paf 741: // write out processed body_code or catch_code
742: r.write_pass_lang(result.processed_code);
1.74 paf 743: }
744:
1.138 paf 745: static void _throw_operator(Request&, MethodParams& params) {
1.129 paf 746: if(params.count()==1) {
747: if(HashStringValue *hash=params[0].get_hash()) {
748: const char* type=0;
749: if(Value* value=hash->get(exception_type_part_name))
1.78 paf 750: type=value->as_string().cstr();
1.129 paf 751: const String* source=0;
752: if(Value* value=hash->get(exception_source_part_name))
1.74 paf 753: source=&value->as_string();
1.138 paf 754: const char* comment=0;
1.129 paf 755: if(Value* value=hash->get(exception_comment_part_name))
1.74 paf 756: comment=value->as_string().cstr();
757:
1.78 paf 758: throw Exception(type,
1.129 paf 759: source?source:0,
760: "%s", comment?comment:"");
1.74 paf 761: } else
1.78 paf 762: throw Exception("parser.runtime",
1.129 paf 763: 0,
1.74 paf 764: "one-param version has hash param");
765: } else {
1.129 paf 766: const char* type=params.as_string(0, "type must be string").cstr();
767: const String& source=params.as_string(1, "source must be string");
768: const char* comment=params.count()>2? params.as_string(2, "comment must be string").cstr()
769: :0;
1.97 paf 770: throw Exception(type, &source, "%s", comment?comment:"");
1.74 paf 771: }
1.132 paf 772: }
1.129 paf 773:
1.150 paf 774: static void _sleep_operator(Request& r, MethodParams& params) {
775: double seconds=params.as_double(0, "seconds must be double", r);
1.151 paf 776: pa_sleep((int)trunc(seconds), (int)trunc(seconds*1000));
1.150 paf 777: }
778:
1.129 paf 779: #if defined(WIN32) && defined(_DEBUG)
780: # define PA_BPT
1.138 paf 781: static void _bpt(Request&, MethodParams&) {
1.129 paf 782: _asm int 3;
783: }
784: #endif
785:
1.10 paf 786: // constructor
787:
1.129 paf 788: VClassMAIN::VClassMAIN(): VClass() {
789: set_name(*new String(MAIN_CLASS_NAME));
790:
791: #ifdef PA_BPT
792: // ^bpt[]
793: add_native_method("bpt", Method::CT_ANY, _bpt, 0, 0);
794: #endif
1.121 paf 795:
1.1 paf 796: // ^if(condition){code-when-true}
797: // ^if(condition){code-when-true}{code-when-false}
1.10 paf 798: add_native_method("if", Method::CT_ANY, _if, 2, 3);
1.1 paf 799:
800: // ^untaint[as-is|uri|sql|js|html|html-typo]{code}
1.59 paf 801: add_native_method("untaint", Method::CT_ANY, _untaint, 1, 2);
1.1 paf 802:
803: // ^taint[as-is|uri|sql|js|html|html-typo]{code}
1.10 paf 804: add_native_method("taint", Method::CT_ANY, _taint, 1, 2);
1.1 paf 805:
806: // ^process[code]
1.146 paf 807: add_native_method("process", Method::CT_ANY, _process, 1, 3);
1.1 paf 808:
809: // ^rem{code}
1.51 parser 810: add_native_method("rem", Method::CT_ANY, _rem, 1, 10000);
1.1 paf 811:
812: // ^while(condition){code}
1.10 paf 813: add_native_method("while", Method::CT_ANY, _while, 2, 2);
1.1 paf 814:
815: // ^use[file]
1.10 paf 816: add_native_method("use", Method::CT_ANY, _use, 1, 1);
1.1 paf 817:
1.54 paf 818: // ^for[i](from-number;to-number-inclusive){code}[delim]
1.10 paf 819: add_native_method("for", Method::CT_ANY, _for, 3+1, 3+1+1);
1.1 paf 820:
821: // ^eval(expr)
822: // ^eval(expr)[format]
1.10 paf 823: add_native_method("eval", Method::CT_ANY, _eval, 1, 2);
1.52 parser 824:
1.1 paf 825: // ^connect[protocol://user:pass@host[:port]/database]{code with ^sql-s}
1.10 paf 826: add_native_method("connect", Method::CT_ANY, _connect, 2, 2);
827:
1.63 paf 828:
1.136 paf 829: // ^cache[file_spec](time){code}[{catch code}] time=0 no cache
1.65 paf 830: // ^cache[file_spec] delete cache
1.161 ! paf 831: // ^cache[] get current expiration time
! 832: add_native_method("cache", Method::CT_ANY, _cache, 0, 4);
1.63 paf 833:
1.28 parser 834: // switch
835:
836: // ^switch[value]{cases}
837: add_native_method("switch", Method::CT_ANY, _switch, 2, 2);
838:
839: // ^case[value]{code}
1.51 parser 840: add_native_method("case", Method::CT_ANY, _case, 2, 10000);
1.74 paf 841:
842: // try-catch
843:
844: // ^try{code}{catch code}
845: add_native_method("try", Method::CT_ANY, _try_operator, 2, 2);
846: // ^throw[$exception hash]
847: // ^throw[type;source;comment]
848: add_native_method("throw", Method::CT_ANY, _throw_operator, 1, 3);
849:
1.150 paf 850: add_native_method("sleep", Method::CT_ANY, _sleep_operator, 1, 1);
1.10 paf 851: }
1.11 paf 852:
853: // constructor & configurator
1.1 paf 854:
1.129 paf 855: VStateless_class& VClassMAIN_create() {
856: return *new VClassMAIN;
1.1 paf 857: }
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