Annotation of parser3/src/classes/op.C, revision 1.149
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:
1.149 ! paf 8: static const char * const IDENT_OP_C="$Date: 2004/05/26 08:22:16 $";
1.1 paf 9:
1.13 paf 10: #include "classes.h"
1.129 paf 11: #include "pa_vmethod_frame.h"
12:
1.1 paf 13: #include "pa_common.h"
1.134 paf 14: #include "pa_os.h"
1.1 paf 15: #include "pa_request.h"
16: #include "pa_vint.h"
17: #include "pa_sql_connection.h"
1.79 paf 18: #include "pa_vdate.h"
1.105 paf 19: #include "pa_vmethod_frame.h"
1.129 paf 20: #include "pa_vclass.h"
1.144 paf 21: #include "pa_charset.h"
1.1 paf 22:
1.18 parser 23: // limits
24:
25: #define MAX_LOOPS 10000
26:
1.10 paf 27: // defines
28:
1.82 paf 29: #define CASE_DEFAULT_VALUE "DEFAULT"
1.146 paf 30: #define PROCESS_MAIN_OPTION_NAME "main"
31: #define PROCESS_FILE_OPTION_NAME "file"
32: #define PROCESS_LINENO_OPTION_NAME "lineno"
1.11 paf 33:
1.10 paf 34: // class
35:
1.113 paf 36: class VClassMAIN: public VClass {
1.10 paf 37: public:
1.129 paf 38: VClassMAIN();
1.10 paf 39: };
40:
1.129 paf 41: // defines for statics
42:
43: #define SWITCH_DATA_NAME "SWITCH-DATA"
44: #define CACHE_DATA_NAME "CACHE-DATA"
45: #define EXCEPTION_VAR_NAME "exception"
46:
47: // statics
48:
49: //^switch ^case
50: static const String switch_data_name(SWITCH_DATA_NAME);
51: //^cache
52: static const String cache_data_name(CACHE_DATA_NAME);
53:
54: static const String exception_var_name(EXCEPTION_VAR_NAME);
55:
1.136 paf 56: // local defines
57:
58: #define CACHE_EXCEPTION_HANDLED_CACHE_NAME "cache"
59:
1.129 paf 60: // helpers
61:
1.130 paf 62: class Untaint_lang_name2enum: public Hash<const String::Body, String::Language> {
1.129 paf 63: public:
64: Untaint_lang_name2enum() {
65: #define ULN(name, LANG) \
1.130 paf 66: put(String::Body(name), (value_type)(String::L_##LANG));
1.129 paf 67: ULN("as-is", AS_IS);
68: ULN("optimized-as-is", AS_IS|String::L_OPTIMIZE_BIT);
69: ULN("file-spec", FILE_SPEC);
70: ULN("http-header", HTTP_HEADER);
71: ULN("mail-header", MAIL_HEADER);
72: ULN("uri", URI);
73: ULN("sql", SQL);
74: ULN("js", JS);
75: ULN("xml", XML);
76: ULN("optimized-xml", XML|String::L_OPTIMIZE_BIT);
77: ULN("html", HTML);
78: ULN("optimized-html", HTML|String::L_OPTIMIZE_BIT);
79: #undef ULN
80: }
81: } untaint_lang_name2enum;
82:
1.10 paf 83: // methods
84:
1.129 paf 85: static void _if(Request& r, MethodParams& params) {
86: Value& condition_code=params.as_junction(0, "condition must be expression");
1.1 paf 87:
1.81 paf 88: bool condition=r.process_to_value(condition_code,
1.1 paf 89: false/*don't intercept string*/).as_bool();
1.6 paf 90: if(condition)
1.129 paf 91: r.write_pass_lang(r.process(params.as_junction(1, "'then' parameter must be code")));
92: else if(params.count()>2)
93: r.write_pass_lang(r.process(params.as_junction(2, "'else' parameter must be code")));
1.1 paf 94: }
95:
1.129 paf 96: static void _untaint(Request& r, MethodParams& params) {
1.1 paf 97:
1.129 paf 98: String::Language lang;
99: if(params.count()==1)
100: lang=String::L_AS_IS; // mark as simply 'tainted'. useful in html from sql
1.59 paf 101: else {
1.129 paf 102: const String& lang_name=params.as_string(0, "lang must be string");
103: lang=untaint_lang_name2enum.get(lang_name);
1.59 paf 104: if(!lang)
1.78 paf 105: throw Exception(0,
1.59 paf 106: &lang_name,
107: "invalid taint language");
108: }
1.1 paf 109:
110: {
1.129 paf 111: Value& vbody=params.as_junction(params.count()-1, "body must be code");
1.1 paf 112:
113: Temp_lang temp_lang(r, lang); // set temporarily specified ^untaint[language;
1.86 paf 114: r.write_pass_lang(r.process(vbody)); // process marking tainted with that lang
1.1 paf 115: }
116: }
117:
1.129 paf 118: static void _taint(Request& r, MethodParams& params) {
119: String::Language lang;
120: if(params.count()==1)
121: lang=String::L_TAINTED; // mark as simply 'tainted'. useful in table:set
1.1 paf 122: else {
1.129 paf 123: const String& lang_name=params.as_string(0, "lang must be string");
124: lang=untaint_lang_name2enum.get(lang_name);
1.1 paf 125: if(!lang)
1.78 paf 126: throw Exception(0,
1.3 paf 127: &lang_name,
128: "invalid taint language");
1.1 paf 129: }
130:
131: {
1.129 paf 132: Value& vbody=params.as_no_junction(params.count()-1, "body must not be code");
1.1 paf 133:
1.129 paf 134: String result;
1.1 paf 135: result.append(
136: vbody.as_string(), // process marking tainted with that lang
137: lang, true); // force result language to specified
138: r.write_pass_lang(result);
139: }
140: }
141:
1.129 paf 142: static void _process(Request& r, MethodParams& params) {
143: Method* main_method;
144:
145: size_t index=0;
146: Value* target_self;
147: Value& maybe_target_self=params[index];
148: if(maybe_target_self.get_string() || maybe_target_self.get_junction())
149: target_self=&r.get_method_frame()->caller()->self();
150: else {
151: target_self=&maybe_target_self; index++;
152: }
153:
1.1 paf 154: {
1.129 paf 155: VStateless_class *target_class=target_self->get_last_derived_class();
1.116 paf 156: if(!target_class)
157: throw Exception("parser.runtime",
1.129 paf 158: 0,
1.116 paf 159: "no target class");
1.114 paf 160:
1.73 paf 161: // temporary remove language change
1.129 paf 162: Temp_lang temp_lang(r, String::L_PASS_APPENDED);
1.1 paf 163: // temporary zero @main so to maybe-replace it in processed code
1.129 paf 164: Temp_method temp_method_main(*target_class, main_method_name, 0);
1.1 paf 165: // temporary zero @auto so it wouldn't be auto-called in Request::use_buf
1.129 paf 166: Temp_method temp_method_auto(*target_class, auto_method_name, 0);
167:
1.146 paf 168: size_t options_index=index+1;
169: HashStringValue* options=0;
170: if(options_index<params.count()) {
171: Value& voptions=params.as_no_junction(options_index, "options must not be code");
172: options=voptions.get_hash();
173: if(!options)
174: throw Exception("parser.runtime",
175: 0,
176: "options must be hash");
177: }
178:
1.129 paf 179: const String* main_alias=0;
1.146 paf 180: const String* file_alias=0;
181: int line_no_alias_offset=0;
182: if(options) {
183: int valid_options=0;
184: if(Value* vmain_alias=options->get(PROCESS_MAIN_OPTION_NAME)) {
185: valid_options++;
186: main_alias=&vmain_alias->as_string();
187: }
188: if(Value* vfile_alias=options->get(PROCESS_FILE_OPTION_NAME)) {
189: valid_options++;
190: file_alias=&vfile_alias->as_string();
191: }
192: if(Value* vline_no_alias_offset=options->get(PROCESS_LINENO_OPTION_NAME)) {
193: valid_options++;
194: line_no_alias_offset=vline_no_alias_offset->as_int();
195: }
196:
197: if(valid_options!=options->count())
198: throw Exception("parser.runtime",
199: 0,
200: "called with invalid option");
201: }
1.129 paf 202:
1.146 paf 203: uint processe_file_no=file_alias?
204: r.register_file(r.absolute(*file_alias))
205: : pseudo_file_no__process;
206: // process...{string}
207: Value& vjunction=params.as_junction(index, "body must be code");
208: // evaluate source to process
209: const String& source=r.process_to_string(vjunction);
210: r.use_buf(*target_class,
211: source.cstr(String::L_UNSPECIFIED, r.connection(false)),
212: main_alias,
213: processe_file_no,
214: line_no_alias_offset);
1.1 paf 215:
1.73 paf 216: // main_method
1.129 paf 217: main_method=target_class->get_method(main_method_name);
1.73 paf 218: }
219: // after restoring current-request-lang
220: // maybe-execute @main[]
221: if(main_method) {
1.119 paf 222: // temporarily set method_frame's self to target_self
1.129 paf 223: Temp_method_frame_self tmfs(*r.get_method_frame(), *target_self);
1.73 paf 224: // execute!
225: r.execute(*main_method->parser_code);
1.1 paf 226: }
227: }
228:
1.138 paf 229: static void _rem(Request&, MethodParams& params) {
1.129 paf 230: params.as_junction(0, "body must be code");
1.1 paf 231: }
232:
1.129 paf 233: static void _while(Request& r, MethodParams& params) {
234: Value& vcondition=params.as_junction(0, "condition must be expression");
235: Value& body=params.as_junction(1, "body must be code");
1.1 paf 236:
237: // while...
238: int endless_loop_count=0;
239: while(true) {
1.18 parser 240: if(++endless_loop_count>=MAX_LOOPS) // endless loop?
1.78 paf 241: throw Exception("parser.runtime",
1.129 paf 242: 0,
1.1 paf 243: "endless loop detected");
244:
1.86 paf 245: bool condition=r.process_to_value(vcondition,
1.1 paf 246: false/*don't intercept string*/).as_bool();
247: if(!condition) // ...condition is true
248: break;
249:
250: // write processed body
1.86 paf 251: r.write_pass_lang(r.process(body));
1.1 paf 252: }
253: }
254:
1.129 paf 255: static void _use(Request& r, MethodParams& params) {
256: Value& vfile=params.as_no_junction(0, "file name must not be code");
1.113 paf 257: r.use_file(r.main_class, vfile.as_string());
1.1 paf 258: }
259:
1.129 paf 260: static void _for(Request& r, MethodParams& params) {
261: const String& var_name=params.as_string(0, "var name must be string");
262: int from=params.as_int(1, "from must be int", r);
263: int to=params.as_int(2, "to must be int", r);
264: Value& body_code=params.as_junction(3, "body must be code");
265: Value* delim_maybe_code=params.count()>4?¶ms[4]:0;
1.1 paf 266:
1.57 paf 267: if(to-from>=MAX_LOOPS) // too long loop?
1.78 paf 268: throw Exception("parser.runtime",
1.129 paf 269: 0,
1.57 paf 270: "endless loop detected");
271:
1.1 paf 272: bool need_delim=false;
1.129 paf 273: VInt* vint=new VInt(0);
1.117 paf 274: r.get_method_frame()->caller()->put_element(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:
1.82 paf 385: if(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,
420: Value* catch_code)
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);
440: junction->method_frame->put_element(exception_var_name, &details.vhash, false);
441: result.processed_code=r.process(*catch_code);
442:
443: // retriving $exception.handled, restoring $exception var
444: Value* vhandled=details.vhash.hash().get(exception_handled_part_name);
445: junction->method_frame->put_element(exception_var_name, saved_exception_var_value, false);
446:
447: bool bhandled=false;
448: if(vhandled) {
449: if(vhandled->is_string()) { // not simple $exception.handled(1/0)?
450: result.exception_should_be_handled=vhandled->get_string(); // considering 'recovered' and let the caller recover
451: return result;
452: }
453:
454: bhandled=vhandled->as_bool();
455: }
456:
457: if(!bhandled) {
458: throw_context.restore(); // restoring throw-context [exception were not handled]
459: rethrow;
460: }
461: }
462: return result;
463: }
1.28 parser 464:
1.63 paf 465: // cache--
466:
467: // consts
468:
1.131 paf 469: const int DATA_STRING_SERIALIZED_VERSION=0x0005;
1.63 paf 470:
471: // helper types
472:
473: #ifndef DOXYGEN
474: struct Data_string_serialized_prolog {
475: int version;
1.79 paf 476: time_t expires;
1.63 paf 477: };
478: #endif
479:
1.68 paf 480: void cache_delete(const String& file_spec) {
481: file_delete(file_spec, false/*fail_on_read_problem*/);
1.63 paf 482: }
1.69 paf 483:
484: #ifndef DOXYGEN
1.135 paf 485: struct Cache_scope {
1.129 paf 486: public:
1.79 paf 487: time_t expires;
1.135 paf 488: const String* body_from_disk;
1.79 paf 489: };
1.69 paf 490: struct Locked_process_and_cache_put_action_info {
491: Request *r;
1.136 paf 492: Cache_scope *scope;
493: Value* body_code; Value* catch_code;
494: const String* processed_code;
1.69 paf 495: };
496: #endif
1.136 paf 497:
498:
499:
500: static StringOrValue process_cache_body_code(Request& r, Value* body_code) {
501: return StringOrValue(&r.process_to_string(*body_code), 0);
502: }
503:
1.129 paf 504: /* @todo maybe network order worth spending some effort?
505: don't bothering myself with network byte order,
506: am not planning to be able to move resulting file across platforms
507: */
1.69 paf 508: static void locked_process_and_cache_put_action(int f, void *context) {
509: Locked_process_and_cache_put_action_info& info=
510: *static_cast<Locked_process_and_cache_put_action_info *>(context);
1.129 paf 511:
1.69 paf 512: // body->process
1.136 paf 513: Try_catch_result result=try_catch(*info.r,
514: process_cache_body_code, info.body_code,
515: info.catch_code);
516:
517: if(result.exception_should_be_handled) {
518: if(*result.exception_should_be_handled==CACHE_EXCEPTION_HANDLED_CACHE_NAME) {
519: if(const String* body_from_disk=info.scope->body_from_disk) // we have something old?
520: info.processed_code=body_from_disk;
521: else
522: throw Exception(0,
523: new String("$"EXCEPTION_VAR_NAME"."EXCEPTION_HANDLED_PART_NAME"["CACHE_EXCEPTION_HANDLED_CACHE_NAME"]"),
524: "fallback failed - there is no old cached body");
525: } else
526: throw Exception("parser.runtime",
527: result.exception_should_be_handled,
528: "$"EXCEPTION_VAR_NAME"."EXCEPTION_HANDLED_PART_NAME" value must be "
529: "either boolean or string '"CACHE_EXCEPTION_HANDLED_CACHE_NAME"'");
530: } else
531: info.processed_code=&result.processed_code.as_string();
1.69 paf 532:
1.79 paf 533: // expiration time not spoiled by ^cache(0) or something?
1.136 paf 534: if(info.scope->expires > time(0)) {
1.79 paf 535: // string -serialize> buffer
1.136 paf 536: String::Cm serialized=info.processed_code->serialize(
1.129 paf 537: sizeof(Data_string_serialized_prolog));
1.79 paf 538: Data_string_serialized_prolog& prolog=
1.129 paf 539: *reinterpret_cast<Data_string_serialized_prolog *>(serialized.str);
1.79 paf 540: prolog.version=DATA_STRING_SERIALIZED_VERSION;
1.136 paf 541: prolog.expires=info.scope->expires;
1.79 paf 542:
543: // buffer -write> file
1.129 paf 544: write(f, serialized.str, serialized.length);
1.79 paf 545: } else // expired!
1.136 paf 546: info.scope->expires=0; // flag it so that could be easily checked by caller
1.69 paf 547: }
1.129 paf 548: const String* locked_process_and_cache_put(Request& r,
1.128 paf 549: Value& body_code,
1.136 paf 550: Value* catch_code,
551: Cache_scope& scope,
552: const String& file_spec)
553: {
1.140 paf 554: Locked_process_and_cache_put_action_info info={&r, &scope, &body_code, catch_code, 0};
1.69 paf 555:
1.129 paf 556: const String* result=file_write_action_under_lock(
1.69 paf 557: file_spec,
558: "cache_put", locked_process_and_cache_put_action, &info,
559: false/*as_text*/,
560: false/*do_append*/,
1.96 paf 561: false/*block*/,
1.136 paf 562: false/*fail on lock problem*/) ? info.processed_code: 0;
1.100 paf 563: time_t now=time(0);
1.136 paf 564: if(scope.expires<=now)
1.79 paf 565: cache_delete(file_spec);
566: return result;
1.63 paf 567: }
1.137 paf 568: #ifndef DOXYGEN
1.135 paf 569: struct Cache_get_result {
570: const String* body;
571: bool expired;
1.137 paf 572: };
573: #endif
574: static Cache_get_result cache_get(Request_charsets& charsets, const String& file_spec, time_t now) {
1.140 paf 575: Cache_get_result result={0, false};
1.135 paf 576:
1.129 paf 577: File_read_result file=file_read(charsets, file_spec,
1.63 paf 578: false/*as_text*/,
1.129 paf 579: 0, //no params
580: false/*fail_on_read_problem*/);
581: if(file.success && file.length/* ignore reads which are empty due to
1.72 paf 582: non-unary open+lockEX conflict with lockSH */) {
1.129 paf 583:
1.72 paf 584: Data_string_serialized_prolog& prolog=
1.129 paf 585: *reinterpret_cast<Data_string_serialized_prolog *>(file.str);
1.63 paf 586:
1.135 paf 587: String* body=new String;
1.72 paf 588: if(
1.129 paf 589: file.length>=sizeof(Data_string_serialized_prolog)
1.135 paf 590: && prolog.version==DATA_STRING_SERIALIZED_VERSION) {
591: if(body->deserialize(sizeof(Data_string_serialized_prolog), file.str, file.length)) {
592: result.body=body;
593: result.expired=prolog.expires <= now;
594: }
595: }
1.72 paf 596: }
1.63 paf 597:
1.135 paf 598: return result;
1.63 paf 599: }
1.129 paf 600: static time_t as_expires(Request& r, MethodParams& params,
1.79 paf 601: int index, time_t now) {
602: time_t result;
1.129 paf 603: if(Value* vdate=params[index].as(VDATE_TYPE, false))
604: result=static_cast<VDate*>(vdate)->get_time();
1.79 paf 605: else
1.129 paf 606: result=now+(time_t)params.as_double(index, "lifespan must be date or number", r);
1.79 paf 607:
608: return result;
609: }
1.129 paf 610: static const String& as_file_spec(Request& r, MethodParams& params, int index) {
611: return r.absolute(params.as_string(index, "filespec must be string"));
1.79 paf 612: }
1.129 paf 613: static void _cache(Request& r, MethodParams& params) {
1.79 paf 614: time_t now=time(0);
615:
616: // ^cache[filename] ^cache(seconds) ^cache[expires date]
1.129 paf 617: if(params.count()==1) {
618: if(params[0].is_string()) { // filename?
1.79 paf 619: cache_delete(as_file_spec(r, params, 0));
620: return;
621: }
622:
623: // secods|expires date
1.135 paf 624: Cache_scope* scope=static_cast<Cache_scope*>(r.classes_conf.get(cache_data_name));
625: if(!scope)
1.79 paf 626: throw Exception("parser.runtime",
1.129 paf 627: 0,
1.79 paf 628: "expire-time reducing instruction without cache");
629:
1.129 paf 630: time_t expires=as_expires(r, params, 0, now);
1.135 paf 631: if(expires < scope->expires)
632: scope->expires=expires;
1.79 paf 633:
634: return;
1.149 ! paf 635: } else if(params.count()<3)
! 636: throw Exception("parser.runtime",
! 637: 0,
! 638: "invalid number of parameters");
1.63 paf 639:
640: // file_spec, expires, body code
1.129 paf 641: const String& file_spec=r.absolute(params.as_string(0, "filespec must be string"));
1.65 paf 642:
1.141 paf 643: Cache_scope scope={as_expires(r, params, 1, now), 0};
1.135 paf 644:
645: Temp_hash_value<const String::Body, void*>
646: cache_scope_setter(r.classes_conf, cache_data_name, &scope);
1.136 paf 647: Value& body_code=params.as_junction(2, "body_code must be code");
648: Value* catch_code=0;
649: if(params.count()>3)
650: catch_code=¶ms.as_junction(3, "catch_code must be code");
1.63 paf 651:
1.135 paf 652: if(scope.expires>now) { // valid 'expires' specified? try cached copy...
1.69 paf 653: // hence we don't hope to have unary create/lockEX
654: // we need some plan to live in a life like that, so...
655: // worst races plan:
656: // A B
657: // open
658: // |open
659: // lockSH
660: // |nonblocking-lockEX fails
661: // unlockSH
662: // close, cache_get returns 0
663: // open
664: // nonblocking-lockEX succeeds; process, write, close
665: // |retry1: open
666: // ...
667: // |lockSH succeeds; ...
668:
669: for(int retry=0; retry<2; retry++) {
1.135 paf 670: Cache_get_result cached=cache_get(r.charsets, file_spec, now);
1.136 paf 671: if(cached.body) { // have cached copy
1.135 paf 672: if(cached.expired)
673: scope.body_from_disk=cached.body; // storing for user to retrive it with ^cache[]
1.136 paf 674: else // and it's not expired yet
675: {
1.135 paf 676: // write it out
677: r.write_assign_lang(*cached.body);
678: // happy with it
679: return;
680: }
1.79 paf 681: }
1.69 paf 682:
1.135 paf 683: // non-blocked lock; process; cache it
684: if(const String* processed_body=
1.136 paf 685: locked_process_and_cache_put(r, body_code, catch_code, scope, file_spec)) {
1.135 paf 686: // write it out
687: r.write_assign_lang(*processed_body);
688: // happy with it
689: return;
690: } else { // somebody writing result right now
691: pa_sleep(0, 500000); // waiting half a second
692: retry=0; // prolonging our wait, than could cache_get it, without processing body_code
693: }
1.69 paf 694: }
1.78 paf 695: throw Exception(0,
1.69 paf 696: &file_spec,
697: "locking problem");
698: } else {
1.79 paf 699: // instructed not to cache; forget cached copy
1.68 paf 700: cache_delete(file_spec);
1.69 paf 701: // process
1.81 paf 702: const String& processed_body=r.process_to_string(body_code);
1.69 paf 703: // write it out
704: r.write_assign_lang(processed_body);
705: // happy with it
706: return;
707: }
708: // never reached
1.63 paf 709: }
710:
1.136 paf 711: static StringOrValue process_try_body_code(Request& r, Value* body_code) {
712: return r.process(*body_code);
713: }
1.129 paf 714: static void _try_operator(Request& r, MethodParams& params) {
715: Value& body_code=params.as_junction(0, "body_code must be code");
716: Value& catch_code=params.as_junction(1, "catch_code must be code");
1.74 paf 717:
1.136 paf 718: Try_catch_result result=try_catch(r,
719: process_try_body_code, &body_code,
720: &catch_code);
721:
722: if(result.exception_should_be_handled)
723: throw Exception("parser.runtime",
724: result.exception_should_be_handled,
725: "catch block must set $exception.handled to some boolean value, not string");
1.123 paf 726:
1.136 paf 727: // write out processed body_code or catch_code
728: r.write_pass_lang(result.processed_code);
1.74 paf 729: }
730:
1.138 paf 731: static void _throw_operator(Request&, MethodParams& params) {
1.129 paf 732: if(params.count()==1) {
733: if(HashStringValue *hash=params[0].get_hash()) {
734: const char* type=0;
735: if(Value* value=hash->get(exception_type_part_name))
1.78 paf 736: type=value->as_string().cstr();
1.129 paf 737: const String* source=0;
738: if(Value* value=hash->get(exception_source_part_name))
1.74 paf 739: source=&value->as_string();
1.138 paf 740: const char* comment=0;
1.129 paf 741: if(Value* value=hash->get(exception_comment_part_name))
1.74 paf 742: comment=value->as_string().cstr();
743:
1.78 paf 744: throw Exception(type,
1.129 paf 745: source?source:0,
746: "%s", comment?comment:"");
1.74 paf 747: } else
1.78 paf 748: throw Exception("parser.runtime",
1.129 paf 749: 0,
1.74 paf 750: "one-param version has hash param");
751: } else {
1.129 paf 752: const char* type=params.as_string(0, "type must be string").cstr();
753: const String& source=params.as_string(1, "source must be string");
754: const char* comment=params.count()>2? params.as_string(2, "comment must be string").cstr()
755: :0;
1.97 paf 756: throw Exception(type, &source, "%s", comment?comment:"");
1.74 paf 757: }
1.132 paf 758: }
1.129 paf 759:
760: #if defined(WIN32) && defined(_DEBUG)
761: # define PA_BPT
1.138 paf 762: static void _bpt(Request&, MethodParams&) {
1.129 paf 763: _asm int 3;
764: }
765: #endif
766:
1.10 paf 767: // constructor
768:
1.129 paf 769: VClassMAIN::VClassMAIN(): VClass() {
770: set_name(*new String(MAIN_CLASS_NAME));
771:
772: #ifdef PA_BPT
773: // ^bpt[]
774: add_native_method("bpt", Method::CT_ANY, _bpt, 0, 0);
775: #endif
1.121 paf 776:
1.1 paf 777: // ^if(condition){code-when-true}
778: // ^if(condition){code-when-true}{code-when-false}
1.10 paf 779: add_native_method("if", Method::CT_ANY, _if, 2, 3);
1.1 paf 780:
781: // ^untaint[as-is|uri|sql|js|html|html-typo]{code}
1.59 paf 782: add_native_method("untaint", Method::CT_ANY, _untaint, 1, 2);
1.1 paf 783:
784: // ^taint[as-is|uri|sql|js|html|html-typo]{code}
1.10 paf 785: add_native_method("taint", Method::CT_ANY, _taint, 1, 2);
1.1 paf 786:
787: // ^process[code]
1.146 paf 788: add_native_method("process", Method::CT_ANY, _process, 1, 3);
1.1 paf 789:
790: // ^rem{code}
1.51 parser 791: add_native_method("rem", Method::CT_ANY, _rem, 1, 10000);
1.1 paf 792:
793: // ^while(condition){code}
1.10 paf 794: add_native_method("while", Method::CT_ANY, _while, 2, 2);
1.1 paf 795:
796: // ^use[file]
1.10 paf 797: add_native_method("use", Method::CT_ANY, _use, 1, 1);
1.1 paf 798:
1.54 paf 799: // ^for[i](from-number;to-number-inclusive){code}[delim]
1.10 paf 800: add_native_method("for", Method::CT_ANY, _for, 3+1, 3+1+1);
1.1 paf 801:
802: // ^eval(expr)
803: // ^eval(expr)[format]
1.10 paf 804: add_native_method("eval", Method::CT_ANY, _eval, 1, 2);
1.52 parser 805:
1.1 paf 806: // ^connect[protocol://user:pass@host[:port]/database]{code with ^sql-s}
1.10 paf 807: add_native_method("connect", Method::CT_ANY, _connect, 2, 2);
808:
1.63 paf 809:
1.136 paf 810: // ^cache[file_spec](time){code}[{catch code}] time=0 no cache
1.65 paf 811: // ^cache[file_spec] delete cache
1.136 paf 812: add_native_method("cache", Method::CT_ANY, _cache, 1, 4);
1.63 paf 813:
1.28 parser 814: // switch
815:
816: // ^switch[value]{cases}
817: add_native_method("switch", Method::CT_ANY, _switch, 2, 2);
818:
819: // ^case[value]{code}
1.51 parser 820: add_native_method("case", Method::CT_ANY, _case, 2, 10000);
1.74 paf 821:
822: // try-catch
823:
824: // ^try{code}{catch code}
825: add_native_method("try", Method::CT_ANY, _try_operator, 2, 2);
826: // ^throw[$exception hash]
827: // ^throw[type;source;comment]
828: add_native_method("throw", Method::CT_ANY, _throw_operator, 1, 3);
829:
1.10 paf 830: }
1.11 paf 831:
832: // constructor & configurator
1.1 paf 833:
1.129 paf 834: VStateless_class& VClassMAIN_create() {
835: return *new VClassMAIN;
1.1 paf 836: }
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