Annotation of parser3/src/classes/op.C, revision 1.158
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:
1.158 ! paf 8: static const char * const IDENT_OP_C="$Date: 2005/08/30 08:23:09 $";
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) {
1.156 paf 86: bool condition=params.as_bool(0, "condition must be expression", r);
1.6 paf 87: if(condition)
1.156 paf 88: r.write_pass_lang(r.process(*params.get(1)));
1.129 paf 89: else if(params.count()>2)
1.156 paf 90: r.write_pass_lang(r.process(*params.get(2)));
1.1 paf 91: }
92:
1.129 paf 93: static void _untaint(Request& r, MethodParams& params) {
1.1 paf 94:
1.129 paf 95: String::Language lang;
96: if(params.count()==1)
97: lang=String::L_AS_IS; // mark as simply 'tainted'. useful in html from sql
1.59 paf 98: else {
1.129 paf 99: const String& lang_name=params.as_string(0, "lang must be string");
100: lang=untaint_lang_name2enum.get(lang_name);
1.59 paf 101: if(!lang)
1.78 paf 102: throw Exception(0,
1.59 paf 103: &lang_name,
104: "invalid taint language");
105: }
1.1 paf 106:
107: {
1.129 paf 108: Value& vbody=params.as_junction(params.count()-1, "body must be code");
1.1 paf 109:
110: Temp_lang temp_lang(r, lang); // set temporarily specified ^untaint[language;
1.86 paf 111: r.write_pass_lang(r.process(vbody)); // process marking tainted with that lang
1.1 paf 112: }
113: }
114:
1.129 paf 115: static void _taint(Request& r, MethodParams& params) {
116: String::Language lang;
117: if(params.count()==1)
118: lang=String::L_TAINTED; // mark as simply 'tainted'. useful in table:set
1.1 paf 119: else {
1.129 paf 120: const String& lang_name=params.as_string(0, "lang must be string");
121: lang=untaint_lang_name2enum.get(lang_name);
1.1 paf 122: if(!lang)
1.78 paf 123: throw Exception(0,
1.3 paf 124: &lang_name,
125: "invalid taint language");
1.1 paf 126: }
127:
128: {
1.129 paf 129: Value& vbody=params.as_no_junction(params.count()-1, "body must not be code");
1.1 paf 130:
1.129 paf 131: String result;
1.1 paf 132: result.append(
133: vbody.as_string(), // process marking tainted with that lang
134: lang, true); // force result language to specified
135: r.write_pass_lang(result);
136: }
137: }
138:
1.129 paf 139: static void _process(Request& r, MethodParams& params) {
140: Method* main_method;
141:
142: size_t index=0;
143: Value* target_self;
144: Value& maybe_target_self=params[index];
145: if(maybe_target_self.get_string() || maybe_target_self.get_junction())
146: target_self=&r.get_method_frame()->caller()->self();
147: else {
148: target_self=&maybe_target_self; index++;
149: }
150:
1.1 paf 151: {
1.129 paf 152: VStateless_class *target_class=target_self->get_last_derived_class();
1.116 paf 153: if(!target_class)
154: throw Exception("parser.runtime",
1.129 paf 155: 0,
1.116 paf 156: "no target class");
1.114 paf 157:
1.73 paf 158: // temporary remove language change
1.129 paf 159: Temp_lang temp_lang(r, String::L_PASS_APPENDED);
1.1 paf 160: // temporary zero @main so to maybe-replace it in processed code
1.129 paf 161: Temp_method temp_method_main(*target_class, main_method_name, 0);
1.1 paf 162: // temporary zero @auto so it wouldn't be auto-called in Request::use_buf
1.129 paf 163: Temp_method temp_method_auto(*target_class, auto_method_name, 0);
164:
1.146 paf 165: size_t options_index=index+1;
166: HashStringValue* options=0;
167: if(options_index<params.count()) {
168: Value& voptions=params.as_no_junction(options_index, "options must not be code");
169: options=voptions.get_hash();
170: if(!options)
171: throw Exception("parser.runtime",
172: 0,
173: "options must be hash");
174: }
175:
1.129 paf 176: const String* main_alias=0;
1.146 paf 177: const String* file_alias=0;
178: int line_no_alias_offset=0;
179: if(options) {
180: int valid_options=0;
181: if(Value* vmain_alias=options->get(PROCESS_MAIN_OPTION_NAME)) {
182: valid_options++;
183: main_alias=&vmain_alias->as_string();
184: }
185: if(Value* vfile_alias=options->get(PROCESS_FILE_OPTION_NAME)) {
186: valid_options++;
187: file_alias=&vfile_alias->as_string();
188: }
189: if(Value* vline_no_alias_offset=options->get(PROCESS_LINENO_OPTION_NAME)) {
190: valid_options++;
191: line_no_alias_offset=vline_no_alias_offset->as_int();
192: }
193:
194: if(valid_options!=options->count())
195: throw Exception("parser.runtime",
196: 0,
197: "called with invalid option");
198: }
1.129 paf 199:
1.146 paf 200: uint processe_file_no=file_alias?
201: r.register_file(r.absolute(*file_alias))
202: : pseudo_file_no__process;
203: // process...{string}
204: Value& vjunction=params.as_junction(index, "body must be code");
205: // evaluate source to process
206: const String& source=r.process_to_string(vjunction);
207: r.use_buf(*target_class,
208: source.cstr(String::L_UNSPECIFIED, r.connection(false)),
209: main_alias,
210: processe_file_no,
211: line_no_alias_offset);
1.1 paf 212:
1.73 paf 213: // main_method
1.129 paf 214: main_method=target_class->get_method(main_method_name);
1.73 paf 215: }
216: // after restoring current-request-lang
217: // maybe-execute @main[]
218: if(main_method) {
1.119 paf 219: // temporarily set method_frame's self to target_self
1.129 paf 220: Temp_method_frame_self tmfs(*r.get_method_frame(), *target_self);
1.73 paf 221: // execute!
222: r.execute(*main_method->parser_code);
1.1 paf 223: }
224: }
225:
1.138 paf 226: static void _rem(Request&, MethodParams& params) {
1.129 paf 227: params.as_junction(0, "body must be code");
1.1 paf 228: }
229:
1.129 paf 230: static void _while(Request& r, MethodParams& params) {
231: Value& vcondition=params.as_junction(0, "condition must be expression");
232: Value& body=params.as_junction(1, "body must be code");
1.1 paf 233:
234: // while...
235: int endless_loop_count=0;
236: while(true) {
1.18 parser 237: if(++endless_loop_count>=MAX_LOOPS) // endless loop?
1.78 paf 238: throw Exception("parser.runtime",
1.129 paf 239: 0,
1.1 paf 240: "endless loop detected");
241:
1.86 paf 242: bool condition=r.process_to_value(vcondition,
1.1 paf 243: false/*don't intercept string*/).as_bool();
244: if(!condition) // ...condition is true
245: break;
246:
247: // write processed body
1.86 paf 248: r.write_pass_lang(r.process(body));
1.1 paf 249: }
250: }
251:
1.129 paf 252: static void _use(Request& r, MethodParams& params) {
253: Value& vfile=params.as_no_junction(0, "file name must not be code");
1.113 paf 254: r.use_file(r.main_class, vfile.as_string());
1.1 paf 255: }
256:
1.129 paf 257: static void _for(Request& r, MethodParams& params) {
258: const String& var_name=params.as_string(0, "var name must be string");
259: int from=params.as_int(1, "from must be int", r);
260: int to=params.as_int(2, "to must be int", r);
261: Value& body_code=params.as_junction(3, "body must be code");
262: Value* delim_maybe_code=params.count()>4?¶ms[4]:0;
1.1 paf 263:
1.57 paf 264: if(to-from>=MAX_LOOPS) // too long loop?
1.78 paf 265: throw Exception("parser.runtime",
1.129 paf 266: 0,
1.57 paf 267: "endless loop detected");
268:
1.1 paf 269: bool need_delim=false;
1.129 paf 270: VInt* vint=new VInt(0);
1.154 paf 271:
272: VMethodFrame& caller=*r.get_method_frame()->caller();
273: caller.put_element(caller, var_name, vint, false);
1.1 paf 274: for(int i=from; i<=to; i++) {
275: vint->set_int(i);
276:
1.108 paf 277: StringOrValue sv_processed=r.process(body_code);
1.129 paf 278: const String* s_processed=sv_processed.get_string();
279: if(delim_maybe_code && s_processed && s_processed->length()) { // delimiter set and we have body
1.108 paf 280: if(need_delim) // need delim & iteration produced string?
1.86 paf 281: r.write_pass_lang(r.process(*delim_maybe_code));
1.1 paf 282: need_delim=true;
283: }
1.108 paf 284: r.write_pass_lang(sv_processed);
1.1 paf 285: }
286: }
287:
1.129 paf 288: static void _eval(Request& r, MethodParams& params) {
289: Value& expr=params.as_junction(0, "need expression");
1.1 paf 290: // evaluate expresion
1.129 paf 291: Value& value_result=r.process_to_value(expr,
1.1 paf 292: true/*don't intercept string*/).as_expr_result();
1.129 paf 293: if(params.count()>1) {
294: Value& fmt=params.as_no_junction(1, "fmt must not be code");
295: r.write_no_lang(String(format(value_result.as_double(), fmt.as_string().cstrm())));
1.91 paf 296: } else
1.129 paf 297: r.write_no_lang(value_result);
1.1 paf 298: }
299:
1.129 paf 300: static void _connect(Request& r, MethodParams& params) {
1.63 paf 301: #ifdef RESOURCES_DEBUG
302: struct timeval mt[2];
303: #endif
1.129 paf 304: Value& url=params.as_no_junction(0, "url must not be code");
305: Value& body_code=params.as_junction(1, "body must be code");
1.1 paf 306:
1.129 paf 307: Table* protocol2driver_and_client=0;
308: if(Value* sql=r.main_class.get_element(String(MAIN_SQL_NAME), r.main_class, false)) {
309: if(Value* element=sql->get_element(String(MAIN_SQL_DRIVERS_NAME), *sql, false)) {
1.113 paf 310: protocol2driver_and_client=element->get_table();
311: }
312: }
1.11 paf 313:
1.63 paf 314: #ifdef RESOURCES_DEBUG
315: //measure:before
316: gettimeofday(&mt[0],NULL);
317: #endif
1.1 paf 318: // connect
1.142 paf 319: SQL_Connection* connection=SQL_driver_manager->get_connection(url.as_string(),
1.144 paf 320: protocol2driver_and_client,
321: r.charsets.source().NAME().cstr());
1.1 paf 322:
1.63 paf 323: #ifdef RESOURCES_DEBUG
324: //measure:after connect
325: gettimeofday(&mt[1],NULL);
326:
327: double t[2];
328: for(int i=0;i<2;i++)
329: t[i]=mt[i].tv_sec+mt[i].tv_usec/1000000.0;
330:
331: r.sql_connect_time+=t[1]-t[0];
332: #endif
1.129 paf 333: Temp_connection temp_connection(r, connection);
1.1 paf 334: // execute body
1.53 parser 335: try {
1.86 paf 336: r.write_assign_lang(r.process(body_code));
1.129 paf 337: connection->commit();
338: connection->close();
1.75 paf 339: } catch(...) { // process problem
1.129 paf 340: connection->rollback();
341: connection->close();
342: rethrow;
1.1 paf 343: }
344: }
345:
1.41 parser 346: #ifndef DOXYGEN
1.129 paf 347: class Switch_data: public PA_Object {
348: public:
349: Request& r;
350: Value& searching;
351: Value* found;
352: Value* _default;
353: public:
354: Switch_data(Request& ar, Value& asearching):
355: r(ar), searching(asearching) {}
1.28 parser 356: };
1.41 parser 357: #endif
1.129 paf 358: static void _switch(Request& r, MethodParams& params) {
359: Switch_data* data=new Switch_data(r, r.process_to_value(params[0]));
1.135 paf 360: Temp_hash_value<const String::Body, void*>
1.129 paf 361: switch_data_setter(r.classes_conf, switch_data_name, data);
1.28 parser 362:
1.129 paf 363: Value& cases_code=params.as_junction(1, "switch cases must be code");
1.82 paf 364: // execution of found ^case[...]{code} must be in context of ^switch[...]{code}
365: // because of stacked WWrapper used there as wcontext
1.84 paf 366: r.process(cases_code, true/*intercept_string*/);
1.147 paf 367: if(Value* selected_code=data->found? data->found: data->_default)
1.107 paf 368: r.write_pass_lang(r.process(*selected_code));
1.28 parser 369: }
370:
1.129 paf 371: static void _case(Request& r, MethodParams& params) {
372: Switch_data* data=static_cast<Switch_data*>(r.classes_conf.get(switch_data_name));
1.38 parser 373: if(!data)
1.78 paf 374: throw Exception("parser.runtime",
1.129 paf 375: 0,
1.38 parser 376: "without switch");
1.28 parser 377:
1.129 paf 378: int count=params.count();
379: Value& code=params.as_junction(--count, "case result must be code");
1.83 paf 380:
1.28 parser 381: for(int i=0; i<count; i++) {
1.129 paf 382: Value& value=r.process_to_value(params[i]);
1.28 parser 383:
1.157 paf 384: if(value.is_string() && value.as_string() == CASE_DEFAULT_VALUE) {
1.129 paf 385: data->_default=&code;
1.28 parser 386: break;
387: }
388:
389: bool matches;
1.129 paf 390: if(data->searching.is_string())
391: matches=data->searching.as_string() == value.as_string();
1.28 parser 392: else
1.129 paf 393: matches=data->searching.as_double() == value.as_double();
1.28 parser 394:
395: if(matches) {
1.82 paf 396: if(data->found)
397: throw Exception("parser.runtime",
1.129 paf 398: 0,
1.82 paf 399: "duplicate found");
400:
1.129 paf 401: data->found=&code;
1.28 parser 402: break;
403: }
404: }
405: }
1.136 paf 406: #ifndef DOXYGEN
407: struct Try_catch_result {
408: StringOrValue processed_code;
409: const String* exception_should_be_handled;
410:
411: Try_catch_result(): exception_should_be_handled(0) {}
412: };
413: #endif
414:
415: /// used by ^try and ^cache, @returns $exception.handled[string] if any
416: template<class I>
417: static Try_catch_result try_catch(Request& r,
418: StringOrValue body_code(Request&, I), I info,
419: Value* catch_code)
420: {
421: Try_catch_result result;
422: if(!catch_code) {
423: result.processed_code=body_code(r, info);
424: return result;
425: }
426:
427: // taking snapshot of try-context
428: Request_context_saver try_context(r);
429: try {
430: result.processed_code=body_code(r, info);
431: } catch(const Exception& e) {
432: Request_context_saver throw_context(r); // taking snapshot of throw-context [stack trace contains error]
433: Request::Exception_details details=r.get_details(e);
434: try_context.restore(); // restoring try-context to perform catch-code
435:
436: Junction* junction=catch_code->get_junction();
437: Value* method_frame=junction->method_frame;
438: Value* saved_exception_var_value=method_frame->get_element(exception_var_name, *method_frame, false);
1.154 paf 439: VMethodFrame& frame=*junction->method_frame;
440: frame.put_element(frame, exception_var_name, &details.vhash, false);
1.136 paf 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);
1.154 paf 445: frame.put_element(frame, exception_var_name, saved_exception_var_value, false);
1.136 paf 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:
1.152 paf 469: const int DATA_STRING_SERIALIZED_VERSION=0x0006;
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) {
1.153 paf 501: return StringOrValue(r.process_to_string(*body_code));
1.136 paf 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) {
1.158 ! paf 614: if(params.count()==0)
! 615: {
! 616: // return current expiration time
! 617: Cache_scope* scope=static_cast<Cache_scope*>(r.classes_conf.get(cache_data_name));
! 618: if(!scope)
! 619: throw Exception("parser.runtime",
! 620: 0,
! 621: "expire-time get without cache");
! 622: r.write_no_lang(*new VDate(scope->expires));
! 623: return;
! 624: }
! 625:
1.79 paf 626: time_t now=time(0);
627:
628: // ^cache[filename] ^cache(seconds) ^cache[expires date]
1.129 paf 629: if(params.count()==1) {
630: if(params[0].is_string()) { // filename?
1.79 paf 631: cache_delete(as_file_spec(r, params, 0));
632: return;
633: }
634:
635: // secods|expires date
1.135 paf 636: Cache_scope* scope=static_cast<Cache_scope*>(r.classes_conf.get(cache_data_name));
637: if(!scope)
1.79 paf 638: throw Exception("parser.runtime",
1.129 paf 639: 0,
1.79 paf 640: "expire-time reducing instruction without cache");
641:
1.129 paf 642: time_t expires=as_expires(r, params, 0, now);
1.135 paf 643: if(expires < scope->expires)
644: scope->expires=expires;
1.79 paf 645:
646: return;
1.149 paf 647: } else if(params.count()<3)
648: throw Exception("parser.runtime",
649: 0,
650: "invalid number of parameters");
1.63 paf 651:
652: // file_spec, expires, body code
1.129 paf 653: const String& file_spec=r.absolute(params.as_string(0, "filespec must be string"));
1.65 paf 654:
1.141 paf 655: Cache_scope scope={as_expires(r, params, 1, now), 0};
1.135 paf 656:
657: Temp_hash_value<const String::Body, void*>
658: cache_scope_setter(r.classes_conf, cache_data_name, &scope);
1.136 paf 659: Value& body_code=params.as_junction(2, "body_code must be code");
660: Value* catch_code=0;
661: if(params.count()>3)
662: catch_code=¶ms.as_junction(3, "catch_code must be code");
1.63 paf 663:
1.135 paf 664: if(scope.expires>now) { // valid 'expires' specified? try cached copy...
1.69 paf 665: // hence we don't hope to have unary create/lockEX
666: // we need some plan to live in a life like that, so...
667: // worst races plan:
668: // A B
669: // open
670: // |open
671: // lockSH
672: // |nonblocking-lockEX fails
673: // unlockSH
674: // close, cache_get returns 0
675: // open
676: // nonblocking-lockEX succeeds; process, write, close
677: // |retry1: open
678: // ...
679: // |lockSH succeeds; ...
680:
681: for(int retry=0; retry<2; retry++) {
1.135 paf 682: Cache_get_result cached=cache_get(r.charsets, file_spec, now);
1.136 paf 683: if(cached.body) { // have cached copy
1.135 paf 684: if(cached.expired)
685: scope.body_from_disk=cached.body; // storing for user to retrive it with ^cache[]
1.136 paf 686: else // and it's not expired yet
687: {
1.135 paf 688: // write it out
689: r.write_assign_lang(*cached.body);
690: // happy with it
691: return;
692: }
1.79 paf 693: }
1.69 paf 694:
1.135 paf 695: // non-blocked lock; process; cache it
696: if(const String* processed_body=
1.136 paf 697: locked_process_and_cache_put(r, body_code, catch_code, scope, file_spec)) {
1.135 paf 698: // write it out
699: r.write_assign_lang(*processed_body);
700: // happy with it
701: return;
702: } else { // somebody writing result right now
703: pa_sleep(0, 500000); // waiting half a second
704: retry=0; // prolonging our wait, than could cache_get it, without processing body_code
705: }
1.69 paf 706: }
1.78 paf 707: throw Exception(0,
1.69 paf 708: &file_spec,
709: "locking problem");
710: } else {
1.79 paf 711: // instructed not to cache; forget cached copy
1.68 paf 712: cache_delete(file_spec);
1.69 paf 713: // process
1.81 paf 714: const String& processed_body=r.process_to_string(body_code);
1.69 paf 715: // write it out
716: r.write_assign_lang(processed_body);
717: // happy with it
718: return;
719: }
720: // never reached
1.63 paf 721: }
722:
1.136 paf 723: static StringOrValue process_try_body_code(Request& r, Value* body_code) {
724: return r.process(*body_code);
725: }
1.129 paf 726: static void _try_operator(Request& r, MethodParams& params) {
727: Value& body_code=params.as_junction(0, "body_code must be code");
728: Value& catch_code=params.as_junction(1, "catch_code must be code");
1.74 paf 729:
1.136 paf 730: Try_catch_result result=try_catch(r,
731: process_try_body_code, &body_code,
732: &catch_code);
733:
734: if(result.exception_should_be_handled)
735: throw Exception("parser.runtime",
736: result.exception_should_be_handled,
737: "catch block must set $exception.handled to some boolean value, not string");
1.123 paf 738:
1.136 paf 739: // write out processed body_code or catch_code
740: r.write_pass_lang(result.processed_code);
1.74 paf 741: }
742:
1.138 paf 743: static void _throw_operator(Request&, MethodParams& params) {
1.129 paf 744: if(params.count()==1) {
745: if(HashStringValue *hash=params[0].get_hash()) {
746: const char* type=0;
747: if(Value* value=hash->get(exception_type_part_name))
1.78 paf 748: type=value->as_string().cstr();
1.129 paf 749: const String* source=0;
750: if(Value* value=hash->get(exception_source_part_name))
1.74 paf 751: source=&value->as_string();
1.138 paf 752: const char* comment=0;
1.129 paf 753: if(Value* value=hash->get(exception_comment_part_name))
1.74 paf 754: comment=value->as_string().cstr();
755:
1.78 paf 756: throw Exception(type,
1.129 paf 757: source?source:0,
758: "%s", comment?comment:"");
1.74 paf 759: } else
1.78 paf 760: throw Exception("parser.runtime",
1.129 paf 761: 0,
1.74 paf 762: "one-param version has hash param");
763: } else {
1.129 paf 764: const char* type=params.as_string(0, "type must be string").cstr();
765: const String& source=params.as_string(1, "source must be string");
766: const char* comment=params.count()>2? params.as_string(2, "comment must be string").cstr()
767: :0;
1.97 paf 768: throw Exception(type, &source, "%s", comment?comment:"");
1.74 paf 769: }
1.132 paf 770: }
1.129 paf 771:
1.150 paf 772: static void _sleep_operator(Request& r, MethodParams& params) {
773: double seconds=params.as_double(0, "seconds must be double", r);
1.151 paf 774: pa_sleep((int)trunc(seconds), (int)trunc(seconds*1000));
1.150 paf 775: }
776:
1.129 paf 777: #if defined(WIN32) && defined(_DEBUG)
778: # define PA_BPT
1.138 paf 779: static void _bpt(Request&, MethodParams&) {
1.129 paf 780: _asm int 3;
781: }
782: #endif
783:
1.10 paf 784: // constructor
785:
1.129 paf 786: VClassMAIN::VClassMAIN(): VClass() {
787: set_name(*new String(MAIN_CLASS_NAME));
788:
789: #ifdef PA_BPT
790: // ^bpt[]
791: add_native_method("bpt", Method::CT_ANY, _bpt, 0, 0);
792: #endif
1.121 paf 793:
1.1 paf 794: // ^if(condition){code-when-true}
795: // ^if(condition){code-when-true}{code-when-false}
1.10 paf 796: add_native_method("if", Method::CT_ANY, _if, 2, 3);
1.1 paf 797:
798: // ^untaint[as-is|uri|sql|js|html|html-typo]{code}
1.59 paf 799: add_native_method("untaint", Method::CT_ANY, _untaint, 1, 2);
1.1 paf 800:
801: // ^taint[as-is|uri|sql|js|html|html-typo]{code}
1.10 paf 802: add_native_method("taint", Method::CT_ANY, _taint, 1, 2);
1.1 paf 803:
804: // ^process[code]
1.146 paf 805: add_native_method("process", Method::CT_ANY, _process, 1, 3);
1.1 paf 806:
807: // ^rem{code}
1.51 parser 808: add_native_method("rem", Method::CT_ANY, _rem, 1, 10000);
1.1 paf 809:
810: // ^while(condition){code}
1.10 paf 811: add_native_method("while", Method::CT_ANY, _while, 2, 2);
1.1 paf 812:
813: // ^use[file]
1.10 paf 814: add_native_method("use", Method::CT_ANY, _use, 1, 1);
1.1 paf 815:
1.54 paf 816: // ^for[i](from-number;to-number-inclusive){code}[delim]
1.10 paf 817: add_native_method("for", Method::CT_ANY, _for, 3+1, 3+1+1);
1.1 paf 818:
819: // ^eval(expr)
820: // ^eval(expr)[format]
1.10 paf 821: add_native_method("eval", Method::CT_ANY, _eval, 1, 2);
1.52 parser 822:
1.1 paf 823: // ^connect[protocol://user:pass@host[:port]/database]{code with ^sql-s}
1.10 paf 824: add_native_method("connect", Method::CT_ANY, _connect, 2, 2);
825:
1.63 paf 826:
1.136 paf 827: // ^cache[file_spec](time){code}[{catch code}] time=0 no cache
1.65 paf 828: // ^cache[file_spec] delete cache
1.136 paf 829: add_native_method("cache", Method::CT_ANY, _cache, 1, 4);
1.63 paf 830:
1.28 parser 831: // switch
832:
833: // ^switch[value]{cases}
834: add_native_method("switch", Method::CT_ANY, _switch, 2, 2);
835:
836: // ^case[value]{code}
1.51 parser 837: add_native_method("case", Method::CT_ANY, _case, 2, 10000);
1.74 paf 838:
839: // try-catch
840:
841: // ^try{code}{catch code}
842: add_native_method("try", Method::CT_ANY, _try_operator, 2, 2);
843: // ^throw[$exception hash]
844: // ^throw[type;source;comment]
845: add_native_method("throw", Method::CT_ANY, _throw_operator, 1, 3);
846:
1.150 paf 847: add_native_method("sleep", Method::CT_ANY, _sleep_operator, 1, 1);
1.10 paf 848: }
1.11 paf 849:
850: // constructor & configurator
1.1 paf 851:
1.129 paf 852: VStateless_class& VClassMAIN_create() {
853: return *new VClassMAIN;
1.1 paf 854: }
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