Annotation of parser3/src/classes/op.C, revision 1.127.2.22.2.18
1.1 paf 1: /** @file
1.9 paf 2: Parser: parser @b operators.
1.1 paf 3:
1.127.2.5 paf 4: Copyright (c) 2001-2003 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:
1.127.2.22.2. 8(paf 8:3): static const char* IDENT_OP_C="$Date: 2003/03/25 11:42:16 $";
1.1 paf 9:
1.13 paf 10: #include "classes.h"
1.127.2.8 paf 11: #include "pa_vmethod_frame.h"
12:
1.1 paf 13: #include "pa_common.h"
14: #include "pa_request.h"
15: #include "pa_vint.h"
16: #include "pa_sql_connection.h"
1.79 paf 17: #include "pa_vdate.h"
1.105 paf 18: #include "pa_vmethod_frame.h"
1.127.2.21 paf 19: #include "pa_vclass.h"
1.1 paf 20:
1.18 parser 21: // limits
22:
23: #define MAX_LOOPS 10000
24:
1.10 paf 25: // defines
26:
1.82 paf 27: #define CASE_DEFAULT_VALUE "DEFAULT"
1.11 paf 28:
1.10 paf 29: // class
30:
1.113 paf 31: class VClassMAIN: public VClass {
1.10 paf 32: public:
1.127.2.10 paf 33: VClassMAIN();
1.127.2.22 paf 34: override ~VClassMAIN() {}
1.10 paf 35: };
36:
1.127.2.10 paf 37: // defines for statics
38:
39: #define SWITCH_DATA_NAME "SWITCH-DATA"
40: #define CACHE_DATA_NAME "CACHE-DATA"
41: #define EXCEPTION_VAR_NAME "exception"
42: #define EXCEPTION_TYPE_PART_NAME "type"
43: #define EXCEPTION_SOURCE_PART_NAME "source"
44: #define EXCEPTION_COMMENT_PART_NAME "comment"
45: #define EXCEPTION_HANDLED_PART_NAME "handled"
46:
47: // statics
48:
49: //^switch ^case
1.127.2.22.2. 3(paf 50:3): static const String switch_data_name(SWITCH_DATA_NAME);
1.127.2.10 paf 51: //^cache
1.127.2.22.2. 3(paf 52:3): static const String cache_data_name(CACHE_DATA_NAME);
1.127.2.10 paf 53:
1.127.2.22.2. 3(paf 54:3): static const String exception_var_name(EXCEPTION_VAR_NAME);
55:3): static const String exception_type_part_name(EXCEPTION_TYPE_PART_NAME);
56:3): static const String exception_source_part_name(EXCEPTION_SOURCE_PART_NAME);
57:3): static const String exception_comment_part_name(EXCEPTION_COMMENT_PART_NAME);
58:3): static const String exception_handled_part_name(EXCEPTION_HANDLED_PART_NAME);
1.127.2.10 paf 59:
1.127.2.1 paf 60: // helpers
61:
1.127.2.22.2. 6(paf 62:3): class Untaint_lang_name2enum: public Hash<const StringBody, String::Language> {
1.127.2.10 paf 63: public:
64: Untaint_lang_name2enum() {
65: #define ULN(name, LANG) \
1.127.2.22.2. 4(paf 66:3): put(StringBody(name), (value_type)(String::L_##LANG));
1.127.2.10 paf 67: ULN("as-is", AS_IS);
1.127.2.22.2. (paf 68:): ULN("optimized-as-is", AS_IS|String::L_OPTIMIZE_BIT);
1.127.2.10 paf 69: ULN("file-spec", FILE_SPEC);
70: ULN("http-header", HTTP_HEADER);
71: ULN("mail-header", MAIL_HEADER);
72: ULN("uri", URI);
73: ULN("table", TABLE);
74: ULN("sql", SQL);
75: ULN("js", JS);
76: ULN("xml", XML);
1.127.2.22.2. (paf 77:): ULN("optimized-xml", XML|String::L_OPTIMIZE_BIT);
1.127.2.10 paf 78: ULN("html", HTML);
1.127.2.22.2. (paf 79:): ULN("optimized-html", HTML|String::L_OPTIMIZE_BIT);
1.127.2.10 paf 80: #undef ULN
81: }
82: } untaint_lang_name2enum;
1.127.2.1 paf 83:
1.10 paf 84: // methods
85:
1.127.2.22.2. 4(paf 86:3): static void _if(Request& r, MethodParams* params) {
3(paf 87:3): Value& condition_code=params->as_junction(0, "condition must be expression");
1.1 paf 88:
1.81 paf 89: bool condition=r.process_to_value(condition_code,
1.83 paf 90: /*0/*no name* /,*/
1.127.2.22.2. 4(paf 91:3): false/*don't intercept string*/).as_bool();
1.6 paf 92: if(condition)
1.127.2.13 paf 93: r.write_pass_lang(r.process(params->as_junction(1, "'then' parameter must be code")));
94: else if(params->count()>2)
95: r.write_pass_lang(r.process(params->as_junction(2, "'else' parameter must be code")));
1.1 paf 96: }
97:
1.127.2.22.2. 2(paf 98:3): static void _untaint(Request& r, MethodParams* params) {
1.1 paf 99:
1.127.2.22.2. 4(paf 100:3): String::Language lang;
1.127.2.13 paf 101: if(params->count()==1)
1.127.2.22.2. (paf 102:): lang=String::L_AS_IS; // mark as simply 'tainted'. useful in html from sql
1.59 paf 103: else {
1.127.2.22.2. (paf 104:): const String& lang_name=params->as_string(0, "lang must be string");
1.127.2.10 paf 105: lang=untaint_lang_name2enum.get(lang_name);
1.59 paf 106: if(!lang)
1.78 paf 107: throw Exception(0,
1.127.2.22.2. 4(paf 108:3): &lang_name,
1.59 paf 109: "invalid taint language");
110: }
1.1 paf 111:
112: {
1.127.2.22.2. 4(paf 113:3): Value& vbody=params->as_junction(params->count()-1, "body must be code");
1.1 paf 114:
115: Temp_lang temp_lang(r, lang); // set temporarily specified ^untaint[language;
1.86 paf 116: r.write_pass_lang(r.process(vbody)); // process marking tainted with that lang
1.1 paf 117: }
118: }
119:
1.127.2.22.2. 4(paf 120:3): static void _taint(Request& r, MethodParams* params) {
121:3): String::Language lang;
1.127.2.13 paf 122: if(params->count()==1)
1.127.2.22.2. (paf 123:): lang=String::L_TAINTED; // mark as simply 'tainted'. useful in table:set
1.1 paf 124: else {
1.127.2.22.2. (paf 125:): const String& lang_name=params->as_string(0, "lang must be string");
1.127.2.10 paf 126: lang=untaint_lang_name2enum.get(lang_name);
1.1 paf 127: if(!lang)
1.78 paf 128: throw Exception(0,
1.127.2.22.2. 4(paf 129:3): &lang_name,
1.3 paf 130: "invalid taint language");
1.1 paf 131: }
132:
133: {
1.127.2.22.2. 4(paf 134:3): Value& vbody=params->as_no_junction(params->count()-1, "body must not be code");
1.1 paf 135:
1.127.2.10 paf 136: String result;
1.1 paf 137: result.append(
1.127.2.22.2. 4(paf 138:3): vbody.as_string(), // process marking tainted with that lang
1.1 paf 139: lang, true); // force result language to specified
140: r.write_pass_lang(result);
141: }
142: }
143:
1.127.2.22.2. 2(paf 144:3): static void _process(Request& r, MethodParams* params) {
(paf 145:): Method* main_method;
4(paf 146:3): Value& target_self=params->count()>1?
1.127.2.13 paf 147: params->as_no_junction(0, "target must not be code")
1.127.2.22.2. 4(paf 148:3): :r.get_method_frame()->caller()->self();
1.1 paf 149: {
1.127.2.22.2. 4(paf 150:3): Value& vjunction=params->as_junction(params->count()-1, "body must be code");
1.114 paf 151:
1.127.2.22.2. 4(paf 152:3): VStateless_class *target_class=target_self.get_last_derived_class();
1.116 paf 153: if(!target_class)
154: throw Exception("parser.runtime",
1.127.2.22.2. 4(paf 155:3): 0,
1.116 paf 156: "no target class");
157:
1.114 paf 158: // evaluate source to process
1.127.2.22.2. 4(paf 159:3): const String& source=r.process_to_string(vjunction);
1.114 paf 160:
1.73 paf 161: // temporary remove language change
1.127.2.22.2. (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
1.127.2.22.2. 4(paf 164:3): 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
1.127.2.22.2. 4(paf 166:3): Temp_method temp_method_auto(*target_class, auto_method_name, 0);
167:3): #ifdef LATER
1.101 paf 168: // calculate pseudo file name of processed chars
169: // would be something like "/some/file(4) process"
170: char local_place[MAX_STRING];
171: #ifndef NO_STRING_ORIGIN
1.127.2.10 paf 172: const String_fragment::Origin& source_origin=source->origin();
173: const String_fragment::Origin& method_origin=method_name->origin();
1.101 paf 174: size_t place_size;
175: if(source_origin.file==method_origin.file)
176: place_size=snprintf(local_place, MAX_STRING, "%s(%d) %s", // same file
177: source_origin.file?source_origin.file:"unknown_file", 1+source_origin.line,
1.127.2.14 paf 178: method_name->cstr().get())+1;
1.101 paf 179: else // different files ^process{external__file_text__or__sql}
180: place_size=snprintf(local_place, MAX_STRING, "%s",
181: source_origin.file?source_origin.file:"unknown_file")+1;
182: #else
1.127.2.9 paf 183: strncpy(local_place, method_name->cstr(), MAX_STRING-1); place[MAX_STRING-1]=0;
1.101 paf 184: size_t place_size=strlen(local_place)+1;
185: #endif
1.127.2.12 paf 186: char *heap_place=pool.copy(local_place, place_size);
1.127.2.22.2. 4(paf 187:3): #endif
1.1 paf 188: // process source code, append processed methods to 'self' class
189: // maybe-define new @main
1.116 paf 190: r.use_buf(*target_class,
1.127.2.22.2. 8(paf 191:3): source.cstr(String::L_UNSPECIFIED, r.connection(false)),
4(paf 192:3): *new String("later"), //new String(heap_place, place_size, true /*tainted*/),
193:3): "later"); //heap_place);
1.1 paf 194:
1.73 paf 195: // main_method
1.127.2.10 paf 196: main_method=target_class->get_method(main_method_name);
1.73 paf 197: }
198: // after restoring current-request-lang
199: // maybe-execute @main[]
200: if(main_method) {
1.119 paf 201: // temporarily set method_frame's self to target_self
202: Temp_method_frame_self tmfs(*r.get_method_frame(), target_self);
1.73 paf 203: // execute!
204: r.execute(*main_method->parser_code);
1.1 paf 205: }
206: }
207:
1.127.2.22.2. 4(paf 208:3): static void _rem(Request& r, MethodParams* params) {
1.127.2.13 paf 209: params->as_junction(0, "body must be code");
1.1 paf 210: }
211:
1.127.2.22.2. 2(paf 212:3): static void _while(Request& r, MethodParams* params) {
4(paf 213:3): Value& vcondition=params->as_junction(0, "condition must be expression");
214:3): Value& body=params->as_junction(1, "body must be code");
1.1 paf 215:
216: // while...
217: int endless_loop_count=0;
218: while(true) {
1.18 parser 219: if(++endless_loop_count>=MAX_LOOPS) // endless loop?
1.78 paf 220: throw Exception("parser.runtime",
1.127.2.22.2. 4(paf 221:3): 0,
1.1 paf 222: "endless loop detected");
223:
1.86 paf 224: bool condition=r.process_to_value(vcondition,
1.83 paf 225: /*0/*no name* /,*/
1.127.2.22.2. 4(paf 226:3): false/*don't intercept string*/).as_bool();
1.1 paf 227: if(!condition) // ...condition is true
228: break;
229:
230: // write processed body
1.86 paf 231: r.write_pass_lang(r.process(body));
1.1 paf 232: }
233: }
234:
1.127.2.22.2. 2(paf 235:3): static void _use(Request& r, MethodParams* params) {
4(paf 236:3): Value& vfile=params->as_no_junction(0, "file name must not be code");
237:3): r.use_file(r.main_class, vfile.as_string());
1.1 paf 238: }
239:
1.127.2.22.2. 2(paf 240:3): static void _for(Request& r, MethodParams* params) {
(paf 241:): const String& var_name=params->as_string(0, "var name must be string");
1.127.2.13 paf 242: int from=params->as_int(1, "from must be int", r);
243: int to=params->as_int(2, "to must be int", r);
1.127.2.22.2. 4(paf 244:3): Value& body_code=params->as_junction(3, "body must be code");
(paf 245:): Value* delim_maybe_code=params->count()>4?(*params)[4]:0;
1.1 paf 246:
1.57 paf 247: if(to-from>=MAX_LOOPS) // too long loop?
1.78 paf 248: throw Exception("parser.runtime",
1.127.2.22.2. 4(paf 249:3): 0,
1.57 paf 250: "endless loop detected");
251:
1.1 paf 252: bool need_delim=false;
1.127.2.22.2. 4(paf 253:3): VInt* vint=new VInt(0);
1.117 paf 254: r.get_method_frame()->caller()->put_element(var_name, vint, false);
1.1 paf 255: for(int i=from; i<=to; i++) {
256: vint->set_int(i);
257:
1.108 paf 258: StringOrValue sv_processed=r.process(body_code);
1.127.2.22.2. 4(paf 259:3): const String* s_processed=sv_processed.get_string();
(paf 260:): if(delim_maybe_code && s_processed && s_processed->length()) { // delimiter set and we have body
1.108 paf 261: if(need_delim) // need delim & iteration produced string?
1.127.2.22.2. 4(paf 262:3): r.write_pass_lang(r.process(*delim_maybe_code));
1.1 paf 263: need_delim=true;
264: }
1.108 paf 265: r.write_pass_lang(sv_processed);
1.1 paf 266: }
267: }
268:
1.127.2.22.2. 2(paf 269:3): static void _eval(Request& r, MethodParams* params) {
4(paf 270:3): Value& expr=params->as_junction(0, "need expression");
1.1 paf 271: // evaluate expresion
1.127.2.22.2. 4(paf 272:3): Value& value_result=*r.process_to_value(expr,
1.83 paf 273: /*0/*no name YET* /,*/
1.127.2.22.2. 4(paf 274:3): true/*don't intercept string*/).as_expr_result();
1.127.2.13 paf 275: if(params->count()>1) {
1.127.2.22.2. 4(paf 276:3): Value& fmt=params->as_no_junction(1, "fmt must not be code");
277:3): r.write_no_lang(String(format(value_result.as_double(), fmt.as_string().cstrm())));
1.91 paf 278: } else
1.127.2.10 paf 279: r.write_no_lang(value_result);
1.1 paf 280: }
281:
1.127.2.22.2. 2(paf 282:3): static void _connect(Request& r, MethodParams* params) {
1.63 paf 283: #ifdef RESOURCES_DEBUG
284: struct timeval mt[2];
285: #endif
1.127.2.22.2. 4(paf 286:3): Value& url=params->as_no_junction(0, "url must not be code");
287:3): Value& body_code=params->as_junction(1, "body must be code");
1.1 paf 288:
1.127.2.10 paf 289: Table* protocol2driver_and_client=0;
1.127.2.22.2. 4(paf 290:3): if(Value* sql=r.main_class.get_element(String(MAIN_SQL_NAME), r.main_class, false)) {
291:3): if(Value* element=sql->get_element(String(MAIN_SQL_DRIVERS_NAME), *sql, false)) {
1.113 paf 292: protocol2driver_and_client=element->get_table();
293: }
294: }
1.11 paf 295:
1.63 paf 296: #ifdef RESOURCES_DEBUG
297: //measure:before
298: gettimeofday(&mt[0],NULL);
299: #endif
1.1 paf 300: // connect
1.127.2.22.2. 4(paf 301:3): SQL_Connection* connection=SQL_driver_manager.get_connection(url.as_string(),
302:3): protocol2driver_and_client);
1.1 paf 303:
1.63 paf 304: #ifdef RESOURCES_DEBUG
305: //measure:after connect
306: gettimeofday(&mt[1],NULL);
307:
308: double t[2];
309: for(int i=0;i<2;i++)
310: t[i]=mt[i].tv_sec+mt[i].tv_usec/1000000.0;
311:
312: r.sql_connect_time+=t[1]-t[0];
313: #endif
1.127.2.22.2. 4(paf 314:3): Temp_connection temp_connection(r, connection);
1.1 paf 315: // execute body
1.53 parser 316: try {
1.86 paf 317: r.write_assign_lang(r.process(body_code));
1.75 paf 318: } catch(...) { // process problem
1.67 paf 319: connection->mark_to_rollback();
1.127.2.6 paf 320: rethrow;
1.1 paf 321: }
322: }
323:
1.41 parser 324: #ifndef DOXYGEN
1.127.2.10 paf 325: class Switch_data: public PA_Object {
326: public:
327: Request& r;
1.127.2.22.2. 4(paf 328:3): Value& searching;
(paf 329:): Value* found;
330:): Value* _default;
1.127.2.10 paf 331: public:
1.127.2.22.2. 4(paf 332:3): Switch_data(Request& ar, Value& asearching):
1.127.2.10 paf 333: r(ar), searching(asearching) {}
1.28 parser 334: };
1.41 parser 335: #endif
1.127.2.22.2. 4(paf 336:3): static void _switch(Request& r, MethodParams* params) {
337:3): Switch_data* data=new Switch_data(r, r.process_to_value(*(*params)[0]));
5(paf 338:3): Temp_hash_value<const StringBody, PA_Object*>
1.127.2.10 paf 339: switch_data_setter(r.classes_conf, switch_data_name, data);
1.28 parser 340:
1.127.2.22.2. 4(paf 341:3): Value& cases_code=params->as_junction(1, "switch cases must be code");
1.82 paf 342: // execution of found ^case[...]{code} must be in context of ^switch[...]{code}
343: // because of stacked WWrapper used there as wcontext
1.84 paf 344: r.process(cases_code, true/*intercept_string*/);
1.127.2.22.2. (paf 345:): if(Value* selected_code=data->found? data->found: data->_default) {
1.83 paf 346: // setting code context, would execute in ^switch[...]{>>context<<}
1.105 paf 347: //selected_code->get_junction()->change_context(cases_code.get_junction());
1.127.2.22.2. 4(paf 348:3): r.write_pass_lang(r.process(*selected_code));
1.83 paf 349: }
1.28 parser 350: }
351:
1.127.2.22.2. 2(paf 352:3): static void _case(Request& r, MethodParams* params) {
4(paf 353:3): Switch_data* data=static_cast<Switch_data*>(r.classes_conf.get(switch_data_name));
1.38 parser 354: if(!data)
1.78 paf 355: throw Exception("parser.runtime",
1.127.2.22.2. 4(paf 356:3): 0,
1.38 parser 357: "without switch");
1.28 parser 358:
1.127.2.13 paf 359: int count=params->count();
1.127.2.22.2. 4(paf 360:3): Value& code=params->as_junction(--count, "case result must be code");
1.83 paf 361:
362: // killing context for safety, would execute in ^switch[...]{>>context<<}
363: // reason: context is stacked, and it would become invalid afterwards
1.105 paf 364: //code->get_junction()->change_context(0);
1.83 paf 365:
1.28 parser 366: for(int i=0; i<count; i++) {
1.127.2.22.2. 4(paf 367:3): Value& value=r.process_to_value(*(*params)[i]);
1.28 parser 368:
1.127.2.22.2. 4(paf 369:3): if(value.as_string() == CASE_DEFAULT_VALUE) {
370:3): data->_default=&code;
1.28 parser 371: break;
372: }
373:
374: bool matches;
1.127.2.22.2. 4(paf 375:3): if(data->searching.is_string())
376:3): matches=data->searching.as_string() == value.as_string();
1.28 parser 377: else
1.127.2.22.2. 4(paf 378:3): matches=data->searching.as_double() == value.as_double();
1.28 parser 379:
380: if(matches) {
1.82 paf 381: if(data->found)
382: throw Exception("parser.runtime",
1.127.2.22.2. 4(paf 383:3): 0,
1.82 paf 384: "duplicate found");
385:
1.127.2.22.2. 4(paf 386:3): data->found=&code;
1.28 parser 387: break;
388: }
389: }
390: }
391:
1.63 paf 392: // cache--
393:
394: // consts
395:
1.127.2.22.2. (paf 396:): const int DATA_STRING_SERIALIZED_VERSION=0x0004;
1.63 paf 397:
398: // helper types
399:
400: #ifndef DOXYGEN
401: struct Data_string_serialized_prolog {
402: int version;
1.79 paf 403: time_t expires;
1.63 paf 404: };
405: #endif
406:
1.127.2.22.2. (paf 407:): void cache_delete(const String& file_spec) {
1.68 paf 408: file_delete(file_spec, false/*fail_on_read_problem*/);
1.63 paf 409: }
1.69 paf 410:
411: #ifndef DOXYGEN
1.127.2.10 paf 412: class Cache_data: public PA_Object {
413: public:
1.79 paf 414: time_t expires;
415: };
1.127.2.10 paf 416: DECLARE_OBJECT_PTR(Cache_data);
1.69 paf 417: struct Locked_process_and_cache_put_action_info {
418: Request *r;
1.79 paf 419: Cache_data *data;
1.127.2.22.2. 4(paf 420:3): Value* body_code; const String* evaluated_body;
1.69 paf 421: };
422: #endif
1.127.2.2 paf 423: /* @todo maybe network order worth spending some effort?
424: don't bothering myself with network byte order,
425: am not planning to be able to move resulting file across platforms
426: */
1.69 paf 427: static void locked_process_and_cache_put_action(int f, void *context) {
428: Locked_process_and_cache_put_action_info& info=
429: *static_cast<Locked_process_and_cache_put_action_info *>(context);
1.127.2.10 paf 430:
1.69 paf 431: // body->process
1.127.2.22.2. 4(paf 432:3): info.evaluated_body=&info.r->process_to_string(*info.body_code);
1.69 paf 433:
1.79 paf 434: // expiration time not spoiled by ^cache(0) or something?
435: if(info.data->expires > time(0)) {
436: // string -serialize> buffer
1.127.2.22.2. 4(paf 437:3): String::C serialized=info.evaluated_body->serialize(
438:3): sizeof(Data_string_serialized_prolog));
1.79 paf 439: Data_string_serialized_prolog& prolog=
1.127.2.22.2. 4(paf 440:3): *reinterpret_cast<Data_string_serialized_prolog *>(serialized.str);
1.79 paf 441: prolog.version=DATA_STRING_SERIALIZED_VERSION;
442: prolog.expires=info.data->expires;
443:
444: // buffer -write> file
1.127.2.22.2. 4(paf 445:3): write(f, serialized.str, serialized.length);
1.79 paf 446: } else // expired!
447: info.data->expires=0; // flag it so that could be easily checked by caller
1.69 paf 448: }
1.127.2.22.2. 4(paf 449:3): const String* locked_process_and_cache_put(Request& r,
450:3): Value& body_code,
451:3): Cache_data& data,
452:3): const String& file_spec) {
1.127.2.10 paf 453: Locked_process_and_cache_put_action_info info;
454: info.r=&r;
455: info.data=&data;
1.127.2.22.2. 4(paf 456:3): info.body_code=&body_code;
1.69 paf 457:
1.127.2.22.2. 4(paf 458:3): const String* result=file_write_action_under_lock(
1.69 paf 459: file_spec,
460: "cache_put", locked_process_and_cache_put_action, &info,
461: false/*as_text*/,
462: false/*do_append*/,
1.96 paf 463: false/*block*/,
1.127.2.22.2. (paf 464:): false/*fail on lock problem*/) ? info.evaluated_body: 0;
1.100 paf 465: time_t now=time(0);
466: if(data.expires<=now)
1.79 paf 467: cache_delete(file_spec);
468: return result;
1.63 paf 469: }
1.127.2.22.2. 4(paf 470:3): const String* cache_get(Charset& charset, const String& file_spec, time_t now) {
(paf 471:): File_read_result file=file_read(charset, file_spec,
1.63 paf 472: false/*as_text*/,
1.127.2.10 paf 473: 0, //no params
474: false/*fail_on_read_problem*/);
1.127.2.22.2. 4(paf 475:3): if(file.success && file.length/* ignore reads which are empty due to
1.72 paf 476: non-unary open+lockEX conflict with lockSH */) {
1.127.2.10 paf 477:
1.72 paf 478: Data_string_serialized_prolog& prolog=
1.127.2.22.2. 4(paf 479:3): *reinterpret_cast<Data_string_serialized_prolog *>(file.str);
1.63 paf 480:
1.127.2.22.2. 4(paf 481:3): String* result=new String;
1.72 paf 482: if(
1.127.2.22.2. 4(paf 483:3): file.length>=sizeof(Data_string_serialized_prolog)
1.72 paf 484: && prolog.version==DATA_STRING_SERIALIZED_VERSION
1.79 paf 485: && prolog.expires > now
1.127.2.22.2. 4(paf 486:3): && result->deserialize(sizeof(Data_string_serialized_prolog), file.str, file.length))
1.72 paf 487: return result;
488: }
1.63 paf 489:
1.127.2.22.2. (paf 490:): return 0;
1.63 paf 491: }
1.127.2.22.2. 2(paf 492:3): static time_t as_expires(Request& r, MethodParams* params,
1.79 paf 493: int index, time_t now) {
494: time_t result;
1.127.2.13 paf 495: if(Value* vdate=(*params)[index]->as(VDATE_TYPE, false))
1.127.2.10 paf 496: result=static_cast<VDate*>(vdate)->get_time();
1.79 paf 497: else
1.127.2.13 paf 498: result=now+(time_t)params->as_double(index, "lifespan must be date or number", r);
1.79 paf 499:
500: return result;
501: }
1.127.2.22.2. (paf 502:): static const String& as_file_spec(Request& r, MethodParams* params, int index) {
1.127.2.13 paf 503: return r.absolute(params->as_string(index, "filespec must be string"));
1.79 paf 504: }
1.127.2.22.2. 2(paf 505:3): static void _cache(Request& r, MethodParams* params) {
1.79 paf 506: time_t now=time(0);
507:
508: // ^cache[filename] ^cache(seconds) ^cache[expires date]
1.127.2.13 paf 509: if(params->count()==1) {
510: if((*params)[0]->is_string()) { // filename?
1.79 paf 511: cache_delete(as_file_spec(r, params, 0));
512: return;
513: }
514:
515: // secods|expires date
1.127.2.22.2. 4(paf 516:3): Cache_data* data=static_cast<Cache_data*>(r.classes_conf.get(cache_data_name));
1.79 paf 517: if(!data)
518: throw Exception("parser.runtime",
1.127.2.22.2. 4(paf 519:3): 0,
1.79 paf 520: "expire-time reducing instruction without cache");
521:
1.127.2.22.2. 4(paf 522:3): time_t expires=as_expires(r, params, 0, now);
1.79 paf 523: if(expires < data->expires)
524: data->expires=expires;
525:
526: return;
527: }
1.63 paf 528:
529: // file_spec, expires, body code
1.127.2.22.2. (paf 530:): const String& file_spec=r.absolute(params->as_string(0, "filespec must be string"));
1.65 paf 531:
1.127.2.22.2. 4(paf 532:3): Cache_data* data=new Cache_data;
5(paf 533:3): Temp_hash_value<const StringBody, PA_Object*>
1.127.2.10 paf 534: cache_data_setter(r.classes_conf, cache_data_name, data);
1.127.2.22.2. 4(paf 535:3): data->expires=as_expires(r, params, 1, now);
536:3): Value& body_code=params->as_junction(2, "body must be code");
1.63 paf 537:
1.127.2.10 paf 538: if(data->expires>now) { // valid 'expires' specified? try cached copy...
1.69 paf 539: // hence we don't hope to have unary create/lockEX
540: // we need some plan to live in a life like that, so...
541: // worst races plan:
542: // A B
543: // open
544: // |open
545: // lockSH
546: // |nonblocking-lockEX fails
547: // unlockSH
548: // close, cache_get returns 0
549: // open
550: // nonblocking-lockEX succeeds; process, write, close
551: // |retry1: open
552: // ...
553: // |lockSH succeeds; ...
554:
555: for(int retry=0; retry<2; retry++) {
1.127.2.22.2. 4(paf 556:3): if(const String* cached_body=cache_get(r.charsets.source(), file_spec, now)) { // have cached copy?
1.79 paf 557: // write it out
558: r.write_assign_lang(*cached_body);
559: // happy with it
560: return;
561: }
1.69 paf 562:
563: // non-blocked lock; process; cache it
1.127.2.22.2. 4(paf 564:3): if(const String* processed_body=
1.127.2.10 paf 565: locked_process_and_cache_put(r, body_code, *data, file_spec)) {
1.63 paf 566: // write it out
1.69 paf 567: r.write_assign_lang(*processed_body);
1.63 paf 568: // happy with it
569: return;
1.69 paf 570: } else { // somebody writing result right now
571: pa_sleep(0, 500000); // waiting half a second
572: retry=0; // prolonging our wait, than could cache_get it, without processing body_code
1.63 paf 573: }
1.69 paf 574: }
1.78 paf 575: throw Exception(0,
1.127.2.22.2. 4(paf 576:3): &file_spec,
1.69 paf 577: "locking problem");
578: } else {
1.79 paf 579: // instructed not to cache; forget cached copy
1.68 paf 580: cache_delete(file_spec);
1.69 paf 581: // process
1.127.2.22.2. (paf 582:): const String& processed_body=r.process_to_string(body_code);
1.69 paf 583: // write it out
1.127.2.22.2. 4(paf 584:3): r.write_assign_lang(processed_body);
1.69 paf 585: // happy with it
586: return;
587: }
588: // never reached
1.63 paf 589: }
590:
1.74 paf 591: // also used in pa_request.C to pass param to @unhandled_exception
1.127.2.22.2. 4(paf 592:3): VHash& exception2vhash(const Exception& e) {
(paf 593:): VHash& result=*new VHash;
4(paf 594:3): HashStringValue& hash=result.hash();
1.127.2.5 paf 595: if(const char* type=e.type(true))
1.127.2.22.2. 4(paf 596:3): hash.put(exception_type_part_name, new VString(*new String(type)));
597:3): if(const String* asource=e.problem_source()) {
598:3): String& source=*new String;
599:3): source.append(*asource, String::L_TAINTED, true/*forced*/);
1.74 paf 600:
1.127.2.22.2. 4(paf 601:3): hash.put(exception_source_part_name, new VString(source));
1.74 paf 602: }
1.127.2.22.2. 4(paf 603:3): if(const char* comment=e.comment(true))
1.127.2.10 paf 604: hash.put(exception_comment_part_name,
1.127.2.22.2. 4(paf 605:3): new VString(*new String(comment, 0, true/*tainted*/)));
606:3): hash.put(exception_handled_part_name, new VBool(false));
1.74 paf 607:
608: return result;
609: }
610:
1.127.2.22.2. 2(paf 611:3): static void _try_operator(Request& r, MethodParams* params) {
4(paf 612:3): Value& body_code=params->as_junction(0, "body_code must be code");
613:3): Value& catch_code=params->as_junction(1, "catch_code must be code");
1.74 paf 614:
1.86 paf 615: StringOrValue result;
1.123 paf 616: // taking snapshot of try-context
617: Request_context_saver try_context(r);
1.74 paf 618: try {
1.86 paf 619: result=r.process(body_code);
1.74 paf 620: } catch(const Exception& e) {
1.123 paf 621: Request_context_saver throw_context(r); // taking snapshot of throw-context [stack trace contains error]
622: try_context.restore(); // restoring try-context to perform catch-code
623:
1.127.2.22.2. 4(paf 624:3): VHash& vhash=exception2vhash(e);
1.74 paf 625:
1.127.2.22.2. 4(paf 626:3): Junction* junction=catch_code.get_junction();
1.127.2.10 paf 627: Value* method_frame=junction->method_frame;
1.127.2.22.2. (paf 628:): Value* saved_exception_var_value=method_frame->get_element(exception_var_name, *method_frame, false);
4(paf 629:3): junction->method_frame->put_element(exception_var_name, &vhash, false);
1.86 paf 630: result=r.process(catch_code);
1.74 paf 631: bool handled=false;
1.127.2.22.2. (paf 632:): if(Value* value=
4(paf 633:3): vhash.hash().get(exception_handled_part_name))
1.74 paf 634: handled=value->as_bool();
1.127.2.10 paf 635: junction->method_frame->put_element(exception_var_name, saved_exception_var_value, false);
1.74 paf 636:
1.123 paf 637: if(!handled) {
638: throw_context.restore(); // restoring throw-context [exception were not handled]
1.74 paf 639: throw(e); // rethrow
1.123 paf 640: }
1.74 paf 641: }
1.123 paf 642: // write out result
1.86 paf 643: r.write_pass_lang(result);
1.74 paf 644: }
645:
1.127.2.22.2. 2(paf 646:3): static void _throw_operator(Request& r, MethodParams* params) {
1.127.2.13 paf 647: if(params->count()==1) {
1.127.2.22.2. (paf 648:): Value* param0=(*params)[0];
2(paf 649:3): if(HashStringValue *hash=param0->get_hash()) {
1.127.2.5 paf 650: const char* type=0;
1.127.2.22.2. (paf 651:): if(Value* value=hash->get(exception_type_part_name))
652:): type=value->as_string().cstr();
4(paf 653:3): const String* source=0;
(paf 654:): if(Value* value=hash->get(exception_source_part_name))
4(paf 655:3): source=&value->as_string();
(paf 656:): const char* comment;
657:): if(Value* value=hash->get(exception_comment_part_name))
658:): comment=value->as_string().cstr();
1.74 paf 659:
1.78 paf 660: throw Exception(type,
1.127.2.22.2. 4(paf 661:3): source?source:0,
662:3): "%s", comment?comment:"");
1.74 paf 663: } else
1.78 paf 664: throw Exception("parser.runtime",
1.127.2.22.2. 4(paf 665:3): 0,
1.74 paf 666: "one-param version has hash param");
667: } else {
1.127.2.22.2. 4(paf 668:3): const char* type=params->as_string(0, "type must be string").cstr();
669:3): const String& source=params->as_string(1, "source must be string");
670:3): const char* comment=params->count()>2? params->as_string(2, "comment must be string").cstr()
1(paf 671:3): :0;
4(paf 672:3): throw Exception(type, &source, "%s", comment?comment:"");
1.74 paf 673: }
674: }
1.127.2.20 paf 675:
676: #if defined(WIN32) && defined(_DEBUG)
677: # define PA_BPT
1.127.2.22.2. 2(paf 678:3): static void _bpt(Request& r, MethodParams* params) {
1.127.2.20 paf 679: _asm int 3;
680: }
681: #endif
682:
1.10 paf 683: // constructor
684:
1.127.2.10 paf 685: VClassMAIN::VClassMAIN(): VClass() {
1.127.2.22.2. 4(paf 686:3): set_name(*new String(MAIN_CLASS_NAME));
1.127.2.20 paf 687:
688: #ifdef PA_BPT
689: // ^bpt[]
690: add_native_method("bpt", Method::CT_ANY, _bpt, 0, 0);
691: #endif
1.121 paf 692:
1.1 paf 693: // ^if(condition){code-when-true}
694: // ^if(condition){code-when-true}{code-when-false}
1.10 paf 695: add_native_method("if", Method::CT_ANY, _if, 2, 3);
1.1 paf 696:
697: // ^untaint[as-is|uri|sql|js|html|html-typo]{code}
1.59 paf 698: add_native_method("untaint", Method::CT_ANY, _untaint, 1, 2);
1.1 paf 699:
700: // ^taint[as-is|uri|sql|js|html|html-typo]{code}
1.10 paf 701: add_native_method("taint", Method::CT_ANY, _taint, 1, 2);
1.1 paf 702:
703: // ^process[code]
1.116 paf 704: add_native_method("process", Method::CT_ANY, _process, 1, 2);
1.1 paf 705:
706: // ^rem{code}
1.51 parser 707: add_native_method("rem", Method::CT_ANY, _rem, 1, 10000);
1.1 paf 708:
709: // ^while(condition){code}
1.10 paf 710: add_native_method("while", Method::CT_ANY, _while, 2, 2);
1.1 paf 711:
712: // ^use[file]
1.10 paf 713: add_native_method("use", Method::CT_ANY, _use, 1, 1);
1.1 paf 714:
1.54 paf 715: // ^for[i](from-number;to-number-inclusive){code}[delim]
1.10 paf 716: add_native_method("for", Method::CT_ANY, _for, 3+1, 3+1+1);
1.1 paf 717:
718: // ^eval(expr)
719: // ^eval(expr)[format]
1.10 paf 720: add_native_method("eval", Method::CT_ANY, _eval, 1, 2);
1.52 parser 721:
1.1 paf 722: // ^connect[protocol://user:pass@host[:port]/database]{code with ^sql-s}
1.10 paf 723: add_native_method("connect", Method::CT_ANY, _connect, 2, 2);
724:
1.63 paf 725:
1.65 paf 726: // ^cache[file_spec] delete cache
1.63 paf 727: // ^cache[file_spec](time){code} time=0 no cache
1.65 paf 728: add_native_method("cache", Method::CT_ANY, _cache, 1, 3);
1.63 paf 729:
1.28 parser 730: // switch
731:
732: // ^switch[value]{cases}
733: add_native_method("switch", Method::CT_ANY, _switch, 2, 2);
734:
735: // ^case[value]{code}
1.51 parser 736: add_native_method("case", Method::CT_ANY, _case, 2, 10000);
1.74 paf 737:
738: // try-catch
739:
740: // ^try{code}{catch code}
741: add_native_method("try", Method::CT_ANY, _try_operator, 2, 2);
742: // ^throw[$exception hash]
743: // ^throw[type;source;comment]
744: add_native_method("throw", Method::CT_ANY, _throw_operator, 1, 3);
745:
1.10 paf 746: }
1.11 paf 747:
748: // constructor & configurator
1.1 paf 749:
1.127.2.22.2. 4(paf 750:3): VStateless_class& VClassMAIN_create() {
751:3): return *new VClassMAIN;
1.1 paf 752: }
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