Annotation of parser3/src/classes/op.C, revision 1.163
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:
1.163 ! paf 8: static const char * const IDENT_OP_C="$Date: 2005/11/25 11:53:59 $";
1.1 paf 9:
1.13 paf 10: #include "classes.h"
1.129 paf 11: #include "pa_vmethod_frame.h"
12:
1.1 paf 13: #include "pa_common.h"
1.134 paf 14: #include "pa_os.h"
1.1 paf 15: #include "pa_request.h"
16: #include "pa_vint.h"
17: #include "pa_sql_connection.h"
1.79 paf 18: #include "pa_vdate.h"
1.105 paf 19: #include "pa_vmethod_frame.h"
1.129 paf 20: #include "pa_vclass.h"
1.144 paf 21: #include "pa_charset.h"
1.1 paf 22:
1.18 parser 23: // limits
24:
1.162 paf 25: #define MAX_LOOPS 20000
1.18 parser 26:
1.10 paf 27: // defines
28:
1.82 paf 29: #define CASE_DEFAULT_VALUE "DEFAULT"
1.146 paf 30: #define PROCESS_MAIN_OPTION_NAME "main"
31: #define PROCESS_FILE_OPTION_NAME "file"
32: #define PROCESS_LINENO_OPTION_NAME "lineno"
1.11 paf 33:
1.10 paf 34: // class
35:
1.113 paf 36: class VClassMAIN: public VClass {
1.10 paf 37: public:
1.129 paf 38: VClassMAIN();
1.10 paf 39: };
40:
1.129 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");
1.162 paf 233: Value& body_code=params.as_junction(1, "body must be code");
234: Value* delim_maybe_code=params.count()>2?¶ms[2]:0;
1.1 paf 235:
236: // while...
237: int endless_loop_count=0;
1.162 paf 238: bool need_delim=false;
1.1 paf 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:
1.162 paf 250: StringOrValue sv_processed=r.process(body_code);
251: const String* s_processed=sv_processed.get_string();
252: if(delim_maybe_code && s_processed && s_processed->length()) { // delimiter set and we have body
253: if(need_delim) // need delim & iteration produced string?
254: r.write_pass_lang(r.process(*delim_maybe_code));
255: need_delim=true;
256: }
257: r.write_pass_lang(sv_processed);
1.1 paf 258: }
259: }
260:
1.129 paf 261: static void _use(Request& r, MethodParams& params) {
262: Value& vfile=params.as_no_junction(0, "file name must not be code");
1.113 paf 263: r.use_file(r.main_class, vfile.as_string());
1.1 paf 264: }
265:
1.129 paf 266: static void _for(Request& r, MethodParams& params) {
267: const String& var_name=params.as_string(0, "var name must be string");
268: int from=params.as_int(1, "from must be int", r);
269: int to=params.as_int(2, "to must be int", r);
270: Value& body_code=params.as_junction(3, "body must be code");
271: Value* delim_maybe_code=params.count()>4?¶ms[4]:0;
1.1 paf 272:
1.57 paf 273: if(to-from>=MAX_LOOPS) // too long loop?
1.78 paf 274: throw Exception("parser.runtime",
1.129 paf 275: 0,
1.57 paf 276: "endless loop detected");
277:
1.1 paf 278: bool need_delim=false;
1.129 paf 279: VInt* vint=new VInt(0);
1.154 paf 280:
281: VMethodFrame& caller=*r.get_method_frame()->caller();
282: caller.put_element(caller, var_name, vint, false);
1.1 paf 283: for(int i=from; i<=to; i++) {
284: vint->set_int(i);
285:
1.108 paf 286: StringOrValue sv_processed=r.process(body_code);
1.129 paf 287: const String* s_processed=sv_processed.get_string();
288: if(delim_maybe_code && s_processed && s_processed->length()) { // delimiter set and we have body
1.108 paf 289: if(need_delim) // need delim & iteration produced string?
1.86 paf 290: r.write_pass_lang(r.process(*delim_maybe_code));
1.1 paf 291: need_delim=true;
292: }
1.108 paf 293: r.write_pass_lang(sv_processed);
1.1 paf 294: }
295: }
296:
1.129 paf 297: static void _eval(Request& r, MethodParams& params) {
298: Value& expr=params.as_junction(0, "need expression");
1.1 paf 299: // evaluate expresion
1.129 paf 300: Value& value_result=r.process_to_value(expr,
1.1 paf 301: true/*don't intercept string*/).as_expr_result();
1.129 paf 302: if(params.count()>1) {
303: Value& fmt=params.as_no_junction(1, "fmt must not be code");
304: r.write_no_lang(String(format(value_result.as_double(), fmt.as_string().cstrm())));
1.91 paf 305: } else
1.129 paf 306: r.write_no_lang(value_result);
1.1 paf 307: }
308:
1.129 paf 309: static void _connect(Request& r, MethodParams& params) {
1.63 paf 310: #ifdef RESOURCES_DEBUG
311: struct timeval mt[2];
312: #endif
1.129 paf 313: Value& url=params.as_no_junction(0, "url must not be code");
314: Value& body_code=params.as_junction(1, "body must be code");
1.1 paf 315:
1.129 paf 316: Table* protocol2driver_and_client=0;
317: if(Value* sql=r.main_class.get_element(String(MAIN_SQL_NAME), r.main_class, false)) {
318: if(Value* element=sql->get_element(String(MAIN_SQL_DRIVERS_NAME), *sql, false)) {
1.113 paf 319: protocol2driver_and_client=element->get_table();
320: }
321: }
1.11 paf 322:
1.63 paf 323: #ifdef RESOURCES_DEBUG
324: //measure:before
325: gettimeofday(&mt[0],NULL);
326: #endif
1.1 paf 327: // connect
1.142 paf 328: SQL_Connection* connection=SQL_driver_manager->get_connection(url.as_string(),
1.144 paf 329: protocol2driver_and_client,
330: r.charsets.source().NAME().cstr());
1.1 paf 331:
1.63 paf 332: #ifdef RESOURCES_DEBUG
333: //measure:after connect
334: gettimeofday(&mt[1],NULL);
335:
336: double t[2];
337: for(int i=0;i<2;i++)
338: t[i]=mt[i].tv_sec+mt[i].tv_usec/1000000.0;
339:
340: r.sql_connect_time+=t[1]-t[0];
341: #endif
1.129 paf 342: Temp_connection temp_connection(r, connection);
1.1 paf 343: // execute body
1.53 parser 344: try {
1.86 paf 345: r.write_assign_lang(r.process(body_code));
1.129 paf 346: connection->commit();
347: connection->close();
1.75 paf 348: } catch(...) { // process problem
1.129 paf 349: connection->rollback();
350: connection->close();
351: rethrow;
1.1 paf 352: }
353: }
354:
1.41 parser 355: #ifndef DOXYGEN
1.129 paf 356: class Switch_data: public PA_Object {
357: public:
358: Request& r;
359: Value& searching;
360: Value* found;
361: Value* _default;
362: public:
363: Switch_data(Request& ar, Value& asearching):
364: r(ar), searching(asearching) {}
1.28 parser 365: };
1.41 parser 366: #endif
1.129 paf 367: static void _switch(Request& r, MethodParams& params) {
368: Switch_data* data=new Switch_data(r, r.process_to_value(params[0]));
1.135 paf 369: Temp_hash_value<const String::Body, void*>
1.129 paf 370: switch_data_setter(r.classes_conf, switch_data_name, data);
1.28 parser 371:
1.129 paf 372: Value& cases_code=params.as_junction(1, "switch cases must be code");
1.82 paf 373: // execution of found ^case[...]{code} must be in context of ^switch[...]{code}
374: // because of stacked WWrapper used there as wcontext
1.84 paf 375: r.process(cases_code, true/*intercept_string*/);
1.147 paf 376: if(Value* selected_code=data->found? data->found: data->_default)
1.107 paf 377: r.write_pass_lang(r.process(*selected_code));
1.28 parser 378: }
379:
1.129 paf 380: static void _case(Request& r, MethodParams& params) {
381: Switch_data* data=static_cast<Switch_data*>(r.classes_conf.get(switch_data_name));
1.38 parser 382: if(!data)
1.78 paf 383: throw Exception("parser.runtime",
1.129 paf 384: 0,
1.38 parser 385: "without switch");
1.28 parser 386:
1.129 paf 387: int count=params.count();
388: Value& code=params.as_junction(--count, "case result must be code");
1.83 paf 389:
1.163 ! paf 390: Value& searching=data->searching;
! 391: bool we_are_searching_string_or_void=searching.is_string() || searching.is_void();
1.28 parser 392: for(int i=0; i<count; i++) {
1.129 paf 393: Value& value=r.process_to_value(params[i]);
1.28 parser 394:
1.157 paf 395: if(value.is_string() && value.as_string() == CASE_DEFAULT_VALUE) {
1.129 paf 396: data->_default=&code;
1.28 parser 397: break;
398: }
399:
400: bool matches;
1.163 ! paf 401: if(we_are_searching_string_or_void)
! 402: matches=searching.as_string() == value.as_string();
1.28 parser 403: else
1.163 ! paf 404: matches=searching.as_double() == value.as_double();
1.28 parser 405:
406: if(matches) {
1.82 paf 407: if(data->found)
408: throw Exception("parser.runtime",
1.129 paf 409: 0,
1.82 paf 410: "duplicate found");
411:
1.129 paf 412: data->found=&code;
1.28 parser 413: break;
414: }
415: }
416: }
1.136 paf 417: #ifndef DOXYGEN
418: struct Try_catch_result {
419: StringOrValue processed_code;
420: const String* exception_should_be_handled;
421:
422: Try_catch_result(): exception_should_be_handled(0) {}
423: };
424: #endif
425:
426: /// used by ^try and ^cache, @returns $exception.handled[string] if any
427: template<class I>
428: static Try_catch_result try_catch(Request& r,
429: StringOrValue body_code(Request&, I), I info,
1.160 paf 430: Value* catch_code, bool could_be_handled_by_caller=false)
1.136 paf 431: {
432: Try_catch_result result;
433: if(!catch_code) {
434: result.processed_code=body_code(r, info);
435: return result;
436: }
437:
438: // taking snapshot of try-context
439: Request_context_saver try_context(r);
440: try {
441: result.processed_code=body_code(r, info);
442: } catch(const Exception& e) {
443: Request_context_saver throw_context(r); // taking snapshot of throw-context [stack trace contains error]
444: Request::Exception_details details=r.get_details(e);
445: try_context.restore(); // restoring try-context to perform catch-code
446:
447: Junction* junction=catch_code->get_junction();
448: Value* method_frame=junction->method_frame;
449: Value* saved_exception_var_value=method_frame->get_element(exception_var_name, *method_frame, false);
1.154 paf 450: VMethodFrame& frame=*junction->method_frame;
451: frame.put_element(frame, exception_var_name, &details.vhash, false);
1.136 paf 452: result.processed_code=r.process(*catch_code);
453:
454: // retriving $exception.handled, restoring $exception var
455: Value* vhandled=details.vhash.hash().get(exception_handled_part_name);
1.154 paf 456: frame.put_element(frame, exception_var_name, saved_exception_var_value, false);
1.136 paf 457:
458: bool bhandled=false;
459: if(vhandled) {
460: if(vhandled->is_string()) { // not simple $exception.handled(1/0)?
1.160 paf 461: if(could_be_handled_by_caller) { // and we can possibly handle it
462: result.exception_should_be_handled=vhandled->get_string(); // considering 'recovered' and let the caller recover
463: return result;
464: }
465:
466: bhandled=false;
467: } else
468: bhandled=vhandled->as_bool();
1.136 paf 469: }
470:
471: if(!bhandled) {
472: throw_context.restore(); // restoring throw-context [exception were not handled]
473: rethrow;
474: }
475: }
476: return result;
477: }
1.28 parser 478:
1.63 paf 479: // cache--
480:
481: // consts
482:
1.152 paf 483: const int DATA_STRING_SERIALIZED_VERSION=0x0006;
1.63 paf 484:
485: // helper types
486:
487: #ifndef DOXYGEN
488: struct Data_string_serialized_prolog {
489: int version;
1.79 paf 490: time_t expires;
1.63 paf 491: };
492: #endif
493:
1.68 paf 494: void cache_delete(const String& file_spec) {
495: file_delete(file_spec, false/*fail_on_read_problem*/);
1.63 paf 496: }
1.69 paf 497:
498: #ifndef DOXYGEN
1.135 paf 499: struct Cache_scope {
1.129 paf 500: public:
1.79 paf 501: time_t expires;
1.135 paf 502: const String* body_from_disk;
1.79 paf 503: };
1.69 paf 504: struct Locked_process_and_cache_put_action_info {
505: Request *r;
1.136 paf 506: Cache_scope *scope;
507: Value* body_code; Value* catch_code;
508: const String* processed_code;
1.69 paf 509: };
510: #endif
1.136 paf 511:
512:
513:
514: static StringOrValue process_cache_body_code(Request& r, Value* body_code) {
1.153 paf 515: return StringOrValue(r.process_to_string(*body_code));
1.136 paf 516: }
517:
1.129 paf 518: /* @todo maybe network order worth spending some effort?
519: don't bothering myself with network byte order,
520: am not planning to be able to move resulting file across platforms
521: */
1.69 paf 522: static void locked_process_and_cache_put_action(int f, void *context) {
523: Locked_process_and_cache_put_action_info& info=
524: *static_cast<Locked_process_and_cache_put_action_info *>(context);
1.129 paf 525:
1.160 paf 526:
527: const String* body_from_disk=info.scope->body_from_disk;
1.69 paf 528: // body->process
1.136 paf 529: Try_catch_result result=try_catch(*info.r,
530: process_cache_body_code, info.body_code,
1.160 paf 531: info.catch_code, body_from_disk!=0 /*we have something old=we can handle=recover later*/);
1.136 paf 532:
533: if(result.exception_should_be_handled) {
534: if(*result.exception_should_be_handled==CACHE_EXCEPTION_HANDLED_CACHE_NAME) {
1.160 paf 535: assert(body_from_disk);
536: info.processed_code=body_from_disk;
1.136 paf 537: } else
538: throw Exception("parser.runtime",
539: result.exception_should_be_handled,
540: "$"EXCEPTION_VAR_NAME"."EXCEPTION_HANDLED_PART_NAME" value must be "
541: "either boolean or string '"CACHE_EXCEPTION_HANDLED_CACHE_NAME"'");
542: } else
543: info.processed_code=&result.processed_code.as_string();
1.69 paf 544:
1.79 paf 545: // expiration time not spoiled by ^cache(0) or something?
1.136 paf 546: if(info.scope->expires > time(0)) {
1.79 paf 547: // string -serialize> buffer
1.136 paf 548: String::Cm serialized=info.processed_code->serialize(
1.129 paf 549: sizeof(Data_string_serialized_prolog));
1.79 paf 550: Data_string_serialized_prolog& prolog=
1.129 paf 551: *reinterpret_cast<Data_string_serialized_prolog *>(serialized.str);
1.79 paf 552: prolog.version=DATA_STRING_SERIALIZED_VERSION;
1.136 paf 553: prolog.expires=info.scope->expires;
1.79 paf 554:
555: // buffer -write> file
1.129 paf 556: write(f, serialized.str, serialized.length);
1.79 paf 557: } else // expired!
1.136 paf 558: info.scope->expires=0; // flag it so that could be easily checked by caller
1.69 paf 559: }
1.129 paf 560: const String* locked_process_and_cache_put(Request& r,
1.128 paf 561: Value& body_code,
1.136 paf 562: Value* catch_code,
563: Cache_scope& scope,
564: const String& file_spec)
565: {
1.140 paf 566: Locked_process_and_cache_put_action_info info={&r, &scope, &body_code, catch_code, 0};
1.69 paf 567:
1.129 paf 568: const String* result=file_write_action_under_lock(
1.69 paf 569: file_spec,
570: "cache_put", locked_process_and_cache_put_action, &info,
571: false/*as_text*/,
572: false/*do_append*/,
1.96 paf 573: false/*block*/,
1.136 paf 574: false/*fail on lock problem*/) ? info.processed_code: 0;
1.100 paf 575: time_t now=time(0);
1.136 paf 576: if(scope.expires<=now)
1.79 paf 577: cache_delete(file_spec);
578: return result;
1.63 paf 579: }
1.137 paf 580: #ifndef DOXYGEN
1.135 paf 581: struct Cache_get_result {
582: const String* body;
583: bool expired;
1.137 paf 584: };
585: #endif
586: static Cache_get_result cache_get(Request_charsets& charsets, const String& file_spec, time_t now) {
1.140 paf 587: Cache_get_result result={0, false};
1.135 paf 588:
1.129 paf 589: File_read_result file=file_read(charsets, file_spec,
1.63 paf 590: false/*as_text*/,
1.129 paf 591: 0, //no params
592: false/*fail_on_read_problem*/);
593: if(file.success && file.length/* ignore reads which are empty due to
1.72 paf 594: non-unary open+lockEX conflict with lockSH */) {
1.129 paf 595:
1.72 paf 596: Data_string_serialized_prolog& prolog=
1.129 paf 597: *reinterpret_cast<Data_string_serialized_prolog *>(file.str);
1.63 paf 598:
1.135 paf 599: String* body=new String;
1.72 paf 600: if(
1.129 paf 601: file.length>=sizeof(Data_string_serialized_prolog)
1.135 paf 602: && prolog.version==DATA_STRING_SERIALIZED_VERSION) {
603: if(body->deserialize(sizeof(Data_string_serialized_prolog), file.str, file.length)) {
604: result.body=body;
605: result.expired=prolog.expires <= now;
606: }
607: }
1.72 paf 608: }
1.63 paf 609:
1.135 paf 610: return result;
1.63 paf 611: }
1.129 paf 612: static time_t as_expires(Request& r, MethodParams& params,
1.79 paf 613: int index, time_t now) {
614: time_t result;
1.129 paf 615: if(Value* vdate=params[index].as(VDATE_TYPE, false))
616: result=static_cast<VDate*>(vdate)->get_time();
1.79 paf 617: else
1.129 paf 618: result=now+(time_t)params.as_double(index, "lifespan must be date or number", r);
1.79 paf 619:
620: return result;
621: }
1.129 paf 622: static const String& as_file_spec(Request& r, MethodParams& params, int index) {
623: return r.absolute(params.as_string(index, "filespec must be string"));
1.79 paf 624: }
1.129 paf 625: static void _cache(Request& r, MethodParams& params) {
1.158 paf 626: if(params.count()==0)
627: {
628: // return current expiration time
629: Cache_scope* scope=static_cast<Cache_scope*>(r.classes_conf.get(cache_data_name));
630: if(!scope)
631: throw Exception("parser.runtime",
632: 0,
633: "expire-time get without cache");
634: r.write_no_lang(*new VDate(scope->expires));
635: return;
636: }
637:
1.79 paf 638: time_t now=time(0);
639:
640: // ^cache[filename] ^cache(seconds) ^cache[expires date]
1.129 paf 641: if(params.count()==1) {
642: if(params[0].is_string()) { // filename?
1.79 paf 643: cache_delete(as_file_spec(r, params, 0));
644: return;
645: }
646:
647: // secods|expires date
1.135 paf 648: Cache_scope* scope=static_cast<Cache_scope*>(r.classes_conf.get(cache_data_name));
649: if(!scope)
1.79 paf 650: throw Exception("parser.runtime",
1.129 paf 651: 0,
1.79 paf 652: "expire-time reducing instruction without cache");
653:
1.129 paf 654: time_t expires=as_expires(r, params, 0, now);
1.135 paf 655: if(expires < scope->expires)
656: scope->expires=expires;
1.79 paf 657:
658: return;
1.149 paf 659: } else if(params.count()<3)
660: throw Exception("parser.runtime",
661: 0,
662: "invalid number of parameters");
1.63 paf 663:
664: // file_spec, expires, body code
1.129 paf 665: const String& file_spec=r.absolute(params.as_string(0, "filespec must be string"));
1.65 paf 666:
1.141 paf 667: Cache_scope scope={as_expires(r, params, 1, now), 0};
1.135 paf 668:
669: Temp_hash_value<const String::Body, void*>
670: cache_scope_setter(r.classes_conf, cache_data_name, &scope);
1.136 paf 671: Value& body_code=params.as_junction(2, "body_code must be code");
672: Value* catch_code=0;
673: if(params.count()>3)
674: catch_code=¶ms.as_junction(3, "catch_code must be code");
1.63 paf 675:
1.135 paf 676: if(scope.expires>now) { // valid 'expires' specified? try cached copy...
1.69 paf 677: // hence we don't hope to have unary create/lockEX
678: // we need some plan to live in a life like that, so...
679: // worst races plan:
680: // A B
681: // open
682: // |open
683: // lockSH
684: // |nonblocking-lockEX fails
685: // unlockSH
686: // close, cache_get returns 0
687: // open
688: // nonblocking-lockEX succeeds; process, write, close
689: // |retry1: open
690: // ...
691: // |lockSH succeeds; ...
692:
693: for(int retry=0; retry<2; retry++) {
1.135 paf 694: Cache_get_result cached=cache_get(r.charsets, file_spec, now);
1.136 paf 695: if(cached.body) { // have cached copy
1.135 paf 696: if(cached.expired)
697: scope.body_from_disk=cached.body; // storing for user to retrive it with ^cache[]
1.136 paf 698: else // and it's not expired yet
699: {
1.135 paf 700: // write it out
701: r.write_assign_lang(*cached.body);
702: // happy with it
703: return;
704: }
1.79 paf 705: }
1.69 paf 706:
1.135 paf 707: // non-blocked lock; process; cache it
708: if(const String* processed_body=
1.136 paf 709: locked_process_and_cache_put(r, body_code, catch_code, scope, file_spec)) {
1.135 paf 710: // write it out
711: r.write_assign_lang(*processed_body);
712: // happy with it
713: return;
714: } else { // somebody writing result right now
715: pa_sleep(0, 500000); // waiting half a second
716: retry=0; // prolonging our wait, than could cache_get it, without processing body_code
717: }
1.69 paf 718: }
1.78 paf 719: throw Exception(0,
1.69 paf 720: &file_spec,
721: "locking problem");
722: } else {
1.79 paf 723: // instructed not to cache; forget cached copy
1.68 paf 724: cache_delete(file_spec);
1.69 paf 725: // process
1.81 paf 726: const String& processed_body=r.process_to_string(body_code);
1.69 paf 727: // write it out
728: r.write_assign_lang(processed_body);
729: // happy with it
730: return;
731: }
732: // never reached
1.63 paf 733: }
734:
1.136 paf 735: static StringOrValue process_try_body_code(Request& r, Value* body_code) {
736: return r.process(*body_code);
737: }
1.129 paf 738: static void _try_operator(Request& r, MethodParams& params) {
739: Value& body_code=params.as_junction(0, "body_code must be code");
740: Value& catch_code=params.as_junction(1, "catch_code must be code");
1.74 paf 741:
1.136 paf 742: Try_catch_result result=try_catch(r,
743: process_try_body_code, &body_code,
744: &catch_code);
745:
746: if(result.exception_should_be_handled)
747: throw Exception("parser.runtime",
748: result.exception_should_be_handled,
749: "catch block must set $exception.handled to some boolean value, not string");
1.123 paf 750:
1.136 paf 751: // write out processed body_code or catch_code
752: r.write_pass_lang(result.processed_code);
1.74 paf 753: }
754:
1.138 paf 755: static void _throw_operator(Request&, MethodParams& params) {
1.129 paf 756: if(params.count()==1) {
757: if(HashStringValue *hash=params[0].get_hash()) {
758: const char* type=0;
759: if(Value* value=hash->get(exception_type_part_name))
1.78 paf 760: type=value->as_string().cstr();
1.129 paf 761: const String* source=0;
762: if(Value* value=hash->get(exception_source_part_name))
1.74 paf 763: source=&value->as_string();
1.138 paf 764: const char* comment=0;
1.129 paf 765: if(Value* value=hash->get(exception_comment_part_name))
1.74 paf 766: comment=value->as_string().cstr();
767:
1.78 paf 768: throw Exception(type,
1.129 paf 769: source?source:0,
770: "%s", comment?comment:"");
1.74 paf 771: } else
1.78 paf 772: throw Exception("parser.runtime",
1.129 paf 773: 0,
1.74 paf 774: "one-param version has hash param");
775: } else {
1.129 paf 776: const char* type=params.as_string(0, "type must be string").cstr();
777: const String& source=params.as_string(1, "source must be string");
778: const char* comment=params.count()>2? params.as_string(2, "comment must be string").cstr()
779: :0;
1.97 paf 780: throw Exception(type, &source, "%s", comment?comment:"");
1.74 paf 781: }
1.132 paf 782: }
1.129 paf 783:
1.150 paf 784: static void _sleep_operator(Request& r, MethodParams& params) {
785: double seconds=params.as_double(0, "seconds must be double", r);
1.151 paf 786: pa_sleep((int)trunc(seconds), (int)trunc(seconds*1000));
1.150 paf 787: }
788:
1.129 paf 789: #if defined(WIN32) && defined(_DEBUG)
790: # define PA_BPT
1.138 paf 791: static void _bpt(Request&, MethodParams&) {
1.129 paf 792: _asm int 3;
793: }
794: #endif
795:
1.10 paf 796: // constructor
797:
1.129 paf 798: VClassMAIN::VClassMAIN(): VClass() {
799: set_name(*new String(MAIN_CLASS_NAME));
800:
801: #ifdef PA_BPT
802: // ^bpt[]
803: add_native_method("bpt", Method::CT_ANY, _bpt, 0, 0);
804: #endif
1.121 paf 805:
1.1 paf 806: // ^if(condition){code-when-true}
807: // ^if(condition){code-when-true}{code-when-false}
1.10 paf 808: add_native_method("if", Method::CT_ANY, _if, 2, 3);
1.1 paf 809:
810: // ^untaint[as-is|uri|sql|js|html|html-typo]{code}
1.59 paf 811: add_native_method("untaint", Method::CT_ANY, _untaint, 1, 2);
1.1 paf 812:
813: // ^taint[as-is|uri|sql|js|html|html-typo]{code}
1.10 paf 814: add_native_method("taint", Method::CT_ANY, _taint, 1, 2);
1.1 paf 815:
816: // ^process[code]
1.146 paf 817: add_native_method("process", Method::CT_ANY, _process, 1, 3);
1.1 paf 818:
819: // ^rem{code}
1.51 parser 820: add_native_method("rem", Method::CT_ANY, _rem, 1, 10000);
1.1 paf 821:
822: // ^while(condition){code}
1.162 paf 823: add_native_method("while", Method::CT_ANY, _while, 2, 3);
1.1 paf 824:
825: // ^use[file]
1.10 paf 826: add_native_method("use", Method::CT_ANY, _use, 1, 1);
1.1 paf 827:
1.54 paf 828: // ^for[i](from-number;to-number-inclusive){code}[delim]
1.10 paf 829: add_native_method("for", Method::CT_ANY, _for, 3+1, 3+1+1);
1.1 paf 830:
831: // ^eval(expr)
832: // ^eval(expr)[format]
1.10 paf 833: add_native_method("eval", Method::CT_ANY, _eval, 1, 2);
1.52 parser 834:
1.1 paf 835: // ^connect[protocol://user:pass@host[:port]/database]{code with ^sql-s}
1.10 paf 836: add_native_method("connect", Method::CT_ANY, _connect, 2, 2);
837:
1.63 paf 838:
1.136 paf 839: // ^cache[file_spec](time){code}[{catch code}] time=0 no cache
1.65 paf 840: // ^cache[file_spec] delete cache
1.161 paf 841: // ^cache[] get current expiration time
842: add_native_method("cache", Method::CT_ANY, _cache, 0, 4);
1.63 paf 843:
1.28 parser 844: // switch
845:
846: // ^switch[value]{cases}
847: add_native_method("switch", Method::CT_ANY, _switch, 2, 2);
848:
849: // ^case[value]{code}
1.51 parser 850: add_native_method("case", Method::CT_ANY, _case, 2, 10000);
1.74 paf 851:
852: // try-catch
853:
854: // ^try{code}{catch code}
855: add_native_method("try", Method::CT_ANY, _try_operator, 2, 2);
856: // ^throw[$exception hash]
857: // ^throw[type;source;comment]
858: add_native_method("throw", Method::CT_ANY, _throw_operator, 1, 3);
859:
1.150 paf 860: add_native_method("sleep", Method::CT_ANY, _sleep_operator, 1, 1);
1.10 paf 861: }
1.11 paf 862:
863: // constructor & configurator
1.1 paf 864:
1.129 paf 865: VStateless_class& VClassMAIN_create() {
866: return *new VClassMAIN;
1.1 paf 867: }
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