Annotation of parser3/src/classes/op.C, revision 1.127.2.22.2.20
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. 0(paf 8:3): static const char* IDENT_OP_C="$Date: 2003/03/26 13:46:57 $";
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();
1.10 paf 34: };
35:
1.127.2.10 paf 36: // defines for statics
37:
38: #define SWITCH_DATA_NAME "SWITCH-DATA"
39: #define CACHE_DATA_NAME "CACHE-DATA"
40: #define EXCEPTION_VAR_NAME "exception"
41: #define EXCEPTION_TYPE_PART_NAME "type"
42: #define EXCEPTION_SOURCE_PART_NAME "source"
43: #define EXCEPTION_COMMENT_PART_NAME "comment"
44: #define EXCEPTION_HANDLED_PART_NAME "handled"
45:
46: // statics
47:
48: //^switch ^case
1.127.2.22.2. 3(paf 49:3): static const String switch_data_name(SWITCH_DATA_NAME);
1.127.2.10 paf 50: //^cache
1.127.2.22.2. 3(paf 51:3): static const String cache_data_name(CACHE_DATA_NAME);
1.127.2.10 paf 52:
1.127.2.22.2. 3(paf 53:3): static const String exception_var_name(EXCEPTION_VAR_NAME);
54:3): static const String exception_type_part_name(EXCEPTION_TYPE_PART_NAME);
55:3): static const String exception_source_part_name(EXCEPTION_SOURCE_PART_NAME);
56:3): static const String exception_comment_part_name(EXCEPTION_COMMENT_PART_NAME);
57:3): static const String exception_handled_part_name(EXCEPTION_HANDLED_PART_NAME);
1.127.2.10 paf 58:
1.127.2.1 paf 59: // helpers
60:
1.127.2.22.2. 6(paf 61:3): class Untaint_lang_name2enum: public Hash<const StringBody, String::Language> {
1.127.2.10 paf 62: public:
63: Untaint_lang_name2enum() {
64: #define ULN(name, LANG) \
1.127.2.22.2. 4(paf 65:3): put(StringBody(name), (value_type)(String::L_##LANG));
1.127.2.10 paf 66: ULN("as-is", AS_IS);
1.127.2.22.2. (paf 67:): ULN("optimized-as-is", AS_IS|String::L_OPTIMIZE_BIT);
1.127.2.10 paf 68: ULN("file-spec", FILE_SPEC);
69: ULN("http-header", HTTP_HEADER);
70: ULN("mail-header", MAIL_HEADER);
71: ULN("uri", URI);
72: ULN("table", TABLE);
73: ULN("sql", SQL);
74: ULN("js", JS);
75: ULN("xml", XML);
1.127.2.22.2. (paf 76:): ULN("optimized-xml", XML|String::L_OPTIMIZE_BIT);
1.127.2.10 paf 77: ULN("html", HTML);
1.127.2.22.2. (paf 78:): ULN("optimized-html", HTML|String::L_OPTIMIZE_BIT);
1.127.2.10 paf 79: #undef ULN
80: }
81: } untaint_lang_name2enum;
1.127.2.1 paf 82:
1.10 paf 83: // methods
84:
1.127.2.22.2. 4(paf 85:3): static void _if(Request& r, MethodParams* params) {
3(paf 86:3): Value& condition_code=params->as_junction(0, "condition must be expression");
1.1 paf 87:
1.81 paf 88: bool condition=r.process_to_value(condition_code,
1.83 paf 89: /*0/*no name* /,*/
1.127.2.22.2. 4(paf 90:3): false/*don't intercept string*/).as_bool();
1.6 paf 91: if(condition)
1.127.2.13 paf 92: r.write_pass_lang(r.process(params->as_junction(1, "'then' parameter must be code")));
93: else if(params->count()>2)
94: r.write_pass_lang(r.process(params->as_junction(2, "'else' parameter must be code")));
1.1 paf 95: }
96:
1.127.2.22.2. 2(paf 97:3): static void _untaint(Request& r, MethodParams* params) {
1.1 paf 98:
1.127.2.22.2. 4(paf 99:3): String::Language lang;
1.127.2.13 paf 100: if(params->count()==1)
1.127.2.22.2. (paf 101:): lang=String::L_AS_IS; // mark as simply 'tainted'. useful in html from sql
1.59 paf 102: else {
1.127.2.22.2. (paf 103:): const String& lang_name=params->as_string(0, "lang must be string");
1.127.2.10 paf 104: lang=untaint_lang_name2enum.get(lang_name);
1.59 paf 105: if(!lang)
1.78 paf 106: throw Exception(0,
1.127.2.22.2. 4(paf 107:3): &lang_name,
1.59 paf 108: "invalid taint language");
109: }
1.1 paf 110:
111: {
1.127.2.22.2. 4(paf 112:3): Value& vbody=params->as_junction(params->count()-1, "body must be code");
1.1 paf 113:
114: Temp_lang temp_lang(r, lang); // set temporarily specified ^untaint[language;
1.86 paf 115: r.write_pass_lang(r.process(vbody)); // process marking tainted with that lang
1.1 paf 116: }
117: }
118:
1.127.2.22.2. 4(paf 119:3): static void _taint(Request& r, MethodParams* params) {
120:3): String::Language lang;
1.127.2.13 paf 121: if(params->count()==1)
1.127.2.22.2. (paf 122:): lang=String::L_TAINTED; // mark as simply 'tainted'. useful in table:set
1.1 paf 123: else {
1.127.2.22.2. (paf 124:): const String& lang_name=params->as_string(0, "lang must be string");
1.127.2.10 paf 125: lang=untaint_lang_name2enum.get(lang_name);
1.1 paf 126: if(!lang)
1.78 paf 127: throw Exception(0,
1.127.2.22.2. 4(paf 128:3): &lang_name,
1.3 paf 129: "invalid taint language");
1.1 paf 130: }
131:
132: {
1.127.2.22.2. 4(paf 133:3): Value& vbody=params->as_no_junction(params->count()-1, "body must not be code");
1.1 paf 134:
1.127.2.10 paf 135: String result;
1.1 paf 136: result.append(
1.127.2.22.2. 4(paf 137:3): vbody.as_string(), // process marking tainted with that lang
1.1 paf 138: lang, true); // force result language to specified
139: r.write_pass_lang(result);
140: }
141: }
142:
1.127.2.22.2. 2(paf 143:3): static void _process(Request& r, MethodParams* params) {
(paf 144:): Method* main_method;
4(paf 145:3): Value& target_self=params->count()>1?
1.127.2.13 paf 146: params->as_no_junction(0, "target must not be code")
1.127.2.22.2. 4(paf 147:3): :r.get_method_frame()->caller()->self();
1.1 paf 148: {
1.127.2.22.2. 4(paf 149:3): Value& vjunction=params->as_junction(params->count()-1, "body must be code");
1.114 paf 150:
1.127.2.22.2. 4(paf 151:3): VStateless_class *target_class=target_self.get_last_derived_class();
1.116 paf 152: if(!target_class)
153: throw Exception("parser.runtime",
1.127.2.22.2. 4(paf 154:3): 0,
1.116 paf 155: "no target class");
156:
1.114 paf 157: // evaluate source to process
1.127.2.22.2. 4(paf 158:3): const String& source=r.process_to_string(vjunction);
1.114 paf 159:
1.73 paf 160: // temporary remove language change
1.127.2.22.2. (paf 161:): Temp_lang temp_lang(r, String::L_PASS_APPENDED);
1.1 paf 162: // temporary zero @main so to maybe-replace it in processed code
1.127.2.22.2. 4(paf 163:3): Temp_method temp_method_main(*target_class, main_method_name, 0);
1.1 paf 164: // temporary zero @auto so it wouldn't be auto-called in Request::use_buf
1.127.2.22.2. 4(paf 165:3): Temp_method temp_method_auto(*target_class, auto_method_name, 0);
166:3): #ifdef LATER
1.101 paf 167: // calculate pseudo file name of processed chars
168: // would be something like "/some/file(4) process"
169: char local_place[MAX_STRING];
170: #ifndef NO_STRING_ORIGIN
1.127.2.10 paf 171: const String_fragment::Origin& source_origin=source->origin();
172: const String_fragment::Origin& method_origin=method_name->origin();
1.101 paf 173: size_t place_size;
174: if(source_origin.file==method_origin.file)
175: place_size=snprintf(local_place, MAX_STRING, "%s(%d) %s", // same file
176: source_origin.file?source_origin.file:"unknown_file", 1+source_origin.line,
1.127.2.14 paf 177: method_name->cstr().get())+1;
1.101 paf 178: else // different files ^process{external__file_text__or__sql}
179: place_size=snprintf(local_place, MAX_STRING, "%s",
180: source_origin.file?source_origin.file:"unknown_file")+1;
181: #else
1.127.2.9 paf 182: strncpy(local_place, method_name->cstr(), MAX_STRING-1); place[MAX_STRING-1]=0;
1.101 paf 183: size_t place_size=strlen(local_place)+1;
184: #endif
1.127.2.12 paf 185: char *heap_place=pool.copy(local_place, place_size);
1.127.2.22.2. 4(paf 186:3): #endif
1.1 paf 187: // process source code, append processed methods to 'self' class
188: // maybe-define new @main
1.116 paf 189: r.use_buf(*target_class,
1.127.2.22.2. 8(paf 190:3): source.cstr(String::L_UNSPECIFIED, r.connection(false)),
4(paf 191:3): *new String("later"), //new String(heap_place, place_size, true /*tainted*/),
192:3): "later"); //heap_place);
1.1 paf 193:
1.73 paf 194: // main_method
1.127.2.10 paf 195: main_method=target_class->get_method(main_method_name);
1.73 paf 196: }
197: // after restoring current-request-lang
198: // maybe-execute @main[]
199: if(main_method) {
1.119 paf 200: // temporarily set method_frame's self to target_self
201: Temp_method_frame_self tmfs(*r.get_method_frame(), target_self);
1.73 paf 202: // execute!
203: r.execute(*main_method->parser_code);
1.1 paf 204: }
205: }
206:
1.127.2.22.2. 4(paf 207:3): static void _rem(Request& r, MethodParams* params) {
1.127.2.13 paf 208: params->as_junction(0, "body must be code");
1.1 paf 209: }
210:
1.127.2.22.2. 2(paf 211:3): static void _while(Request& r, MethodParams* params) {
4(paf 212:3): Value& vcondition=params->as_junction(0, "condition must be expression");
213:3): Value& body=params->as_junction(1, "body must be code");
1.1 paf 214:
215: // while...
216: int endless_loop_count=0;
217: while(true) {
1.18 parser 218: if(++endless_loop_count>=MAX_LOOPS) // endless loop?
1.78 paf 219: throw Exception("parser.runtime",
1.127.2.22.2. 4(paf 220:3): 0,
1.1 paf 221: "endless loop detected");
222:
1.86 paf 223: bool condition=r.process_to_value(vcondition,
1.83 paf 224: /*0/*no name* /,*/
1.127.2.22.2. 4(paf 225:3): false/*don't intercept string*/).as_bool();
1.1 paf 226: if(!condition) // ...condition is true
227: break;
228:
229: // write processed body
1.86 paf 230: r.write_pass_lang(r.process(body));
1.1 paf 231: }
232: }
233:
1.127.2.22.2. 2(paf 234:3): static void _use(Request& r, MethodParams* params) {
4(paf 235:3): Value& vfile=params->as_no_junction(0, "file name must not be code");
236:3): r.use_file(r.main_class, vfile.as_string());
1.1 paf 237: }
238:
1.127.2.22.2. 2(paf 239:3): static void _for(Request& r, MethodParams* params) {
(paf 240:): const String& var_name=params->as_string(0, "var name must be string");
1.127.2.13 paf 241: int from=params->as_int(1, "from must be int", r);
242: int to=params->as_int(2, "to must be int", r);
1.127.2.22.2. 4(paf 243:3): Value& body_code=params->as_junction(3, "body must be code");
(paf 244:): Value* delim_maybe_code=params->count()>4?(*params)[4]:0;
1.1 paf 245:
1.57 paf 246: if(to-from>=MAX_LOOPS) // too long loop?
1.78 paf 247: throw Exception("parser.runtime",
1.127.2.22.2. 4(paf 248:3): 0,
1.57 paf 249: "endless loop detected");
250:
1.1 paf 251: bool need_delim=false;
1.127.2.22.2. 4(paf 252:3): VInt* vint=new VInt(0);
1.117 paf 253: r.get_method_frame()->caller()->put_element(var_name, vint, false);
1.1 paf 254: for(int i=from; i<=to; i++) {
255: vint->set_int(i);
256:
1.108 paf 257: StringOrValue sv_processed=r.process(body_code);
1.127.2.22.2. 4(paf 258:3): const String* s_processed=sv_processed.get_string();
(paf 259:): if(delim_maybe_code && s_processed && s_processed->length()) { // delimiter set and we have body
1.108 paf 260: if(need_delim) // need delim & iteration produced string?
1.127.2.22.2. 4(paf 261:3): r.write_pass_lang(r.process(*delim_maybe_code));
1.1 paf 262: need_delim=true;
263: }
1.108 paf 264: r.write_pass_lang(sv_processed);
1.1 paf 265: }
266: }
267:
1.127.2.22.2. 2(paf 268:3): static void _eval(Request& r, MethodParams* params) {
4(paf 269:3): Value& expr=params->as_junction(0, "need expression");
1.1 paf 270: // evaluate expresion
1.127.2.22.2. 4(paf 271:3): Value& value_result=*r.process_to_value(expr,
1.83 paf 272: /*0/*no name YET* /,*/
1.127.2.22.2. 4(paf 273:3): true/*don't intercept string*/).as_expr_result();
1.127.2.13 paf 274: if(params->count()>1) {
1.127.2.22.2. 4(paf 275:3): Value& fmt=params->as_no_junction(1, "fmt must not be code");
276:3): r.write_no_lang(String(format(value_result.as_double(), fmt.as_string().cstrm())));
1.91 paf 277: } else
1.127.2.10 paf 278: r.write_no_lang(value_result);
1.1 paf 279: }
280:
1.127.2.22.2. 2(paf 281:3): static void _connect(Request& r, MethodParams* params) {
1.63 paf 282: #ifdef RESOURCES_DEBUG
283: struct timeval mt[2];
284: #endif
1.127.2.22.2. 4(paf 285:3): Value& url=params->as_no_junction(0, "url must not be code");
286:3): Value& body_code=params->as_junction(1, "body must be code");
1.1 paf 287:
1.127.2.10 paf 288: Table* protocol2driver_and_client=0;
1.127.2.22.2. 4(paf 289:3): if(Value* sql=r.main_class.get_element(String(MAIN_SQL_NAME), r.main_class, false)) {
290:3): if(Value* element=sql->get_element(String(MAIN_SQL_DRIVERS_NAME), *sql, false)) {
1.113 paf 291: protocol2driver_and_client=element->get_table();
292: }
293: }
1.11 paf 294:
1.63 paf 295: #ifdef RESOURCES_DEBUG
296: //measure:before
297: gettimeofday(&mt[0],NULL);
298: #endif
1.1 paf 299: // connect
1.127.2.22.2. 4(paf 300:3): SQL_Connection* connection=SQL_driver_manager.get_connection(url.as_string(),
301:3): protocol2driver_and_client);
1.1 paf 302:
1.63 paf 303: #ifdef RESOURCES_DEBUG
304: //measure:after connect
305: gettimeofday(&mt[1],NULL);
306:
307: double t[2];
308: for(int i=0;i<2;i++)
309: t[i]=mt[i].tv_sec+mt[i].tv_usec/1000000.0;
310:
311: r.sql_connect_time+=t[1]-t[0];
312: #endif
1.127.2.22.2. 4(paf 313:3): Temp_connection temp_connection(r, connection);
1.1 paf 314: // execute body
1.53 parser 315: try {
1.86 paf 316: r.write_assign_lang(r.process(body_code));
1.75 paf 317: } catch(...) { // process problem
1.67 paf 318: connection->mark_to_rollback();
1.127.2.6 paf 319: rethrow;
1.1 paf 320: }
321: }
322:
1.41 parser 323: #ifndef DOXYGEN
1.127.2.10 paf 324: class Switch_data: public PA_Object {
325: public:
326: Request& r;
1.127.2.22.2. 4(paf 327:3): Value& searching;
(paf 328:): Value* found;
329:): Value* _default;
1.127.2.10 paf 330: public:
1.127.2.22.2. 4(paf 331:3): Switch_data(Request& ar, Value& asearching):
1.127.2.10 paf 332: r(ar), searching(asearching) {}
1.28 parser 333: };
1.41 parser 334: #endif
1.127.2.22.2. 4(paf 335:3): static void _switch(Request& r, MethodParams* params) {
336:3): Switch_data* data=new Switch_data(r, r.process_to_value(*(*params)[0]));
5(paf 337:3): Temp_hash_value<const StringBody, PA_Object*>
1.127.2.10 paf 338: switch_data_setter(r.classes_conf, switch_data_name, data);
1.28 parser 339:
1.127.2.22.2. 4(paf 340:3): Value& cases_code=params->as_junction(1, "switch cases must be code");
1.82 paf 341: // execution of found ^case[...]{code} must be in context of ^switch[...]{code}
342: // because of stacked WWrapper used there as wcontext
1.84 paf 343: r.process(cases_code, true/*intercept_string*/);
1.127.2.22.2. (paf 344:): if(Value* selected_code=data->found? data->found: data->_default) {
1.83 paf 345: // setting code context, would execute in ^switch[...]{>>context<<}
1.105 paf 346: //selected_code->get_junction()->change_context(cases_code.get_junction());
1.127.2.22.2. 4(paf 347:3): r.write_pass_lang(r.process(*selected_code));
1.83 paf 348: }
1.28 parser 349: }
350:
1.127.2.22.2. 2(paf 351:3): static void _case(Request& r, MethodParams* params) {
4(paf 352:3): Switch_data* data=static_cast<Switch_data*>(r.classes_conf.get(switch_data_name));
1.38 parser 353: if(!data)
1.78 paf 354: throw Exception("parser.runtime",
1.127.2.22.2. 4(paf 355:3): 0,
1.38 parser 356: "without switch");
1.28 parser 357:
1.127.2.13 paf 358: int count=params->count();
1.127.2.22.2. 4(paf 359:3): Value& code=params->as_junction(--count, "case result must be code");
1.83 paf 360:
361: // killing context for safety, would execute in ^switch[...]{>>context<<}
362: // reason: context is stacked, and it would become invalid afterwards
1.105 paf 363: //code->get_junction()->change_context(0);
1.83 paf 364:
1.28 parser 365: for(int i=0; i<count; i++) {
1.127.2.22.2. 4(paf 366:3): Value& value=r.process_to_value(*(*params)[i]);
1.28 parser 367:
1.127.2.22.2. 4(paf 368:3): if(value.as_string() == CASE_DEFAULT_VALUE) {
369:3): data->_default=&code;
1.28 parser 370: break;
371: }
372:
373: bool matches;
1.127.2.22.2. 4(paf 374:3): if(data->searching.is_string())
375:3): matches=data->searching.as_string() == value.as_string();
1.28 parser 376: else
1.127.2.22.2. 4(paf 377:3): matches=data->searching.as_double() == value.as_double();
1.28 parser 378:
379: if(matches) {
1.82 paf 380: if(data->found)
381: throw Exception("parser.runtime",
1.127.2.22.2. 4(paf 382:3): 0,
1.82 paf 383: "duplicate found");
384:
1.127.2.22.2. 4(paf 385:3): data->found=&code;
1.28 parser 386: break;
387: }
388: }
389: }
390:
1.63 paf 391: // cache--
392:
393: // consts
394:
1.127.2.22.2. (paf 395:): const int DATA_STRING_SERIALIZED_VERSION=0x0004;
1.63 paf 396:
397: // helper types
398:
399: #ifndef DOXYGEN
400: struct Data_string_serialized_prolog {
401: int version;
1.79 paf 402: time_t expires;
1.63 paf 403: };
404: #endif
405:
1.127.2.22.2. (paf 406:): void cache_delete(const String& file_spec) {
1.68 paf 407: file_delete(file_spec, false/*fail_on_read_problem*/);
1.63 paf 408: }
1.69 paf 409:
410: #ifndef DOXYGEN
1.127.2.10 paf 411: class Cache_data: public PA_Object {
412: public:
1.79 paf 413: time_t expires;
414: };
1.69 paf 415: struct Locked_process_and_cache_put_action_info {
416: Request *r;
1.79 paf 417: Cache_data *data;
1.127.2.22.2. 4(paf 418:3): Value* body_code; const String* evaluated_body;
1.69 paf 419: };
420: #endif
1.127.2.2 paf 421: /* @todo maybe network order worth spending some effort?
422: don't bothering myself with network byte order,
423: am not planning to be able to move resulting file across platforms
424: */
1.69 paf 425: static void locked_process_and_cache_put_action(int f, void *context) {
426: Locked_process_and_cache_put_action_info& info=
427: *static_cast<Locked_process_and_cache_put_action_info *>(context);
1.127.2.10 paf 428:
1.69 paf 429: // body->process
1.127.2.22.2. 4(paf 430:3): info.evaluated_body=&info.r->process_to_string(*info.body_code);
1.69 paf 431:
1.79 paf 432: // expiration time not spoiled by ^cache(0) or something?
433: if(info.data->expires > time(0)) {
434: // string -serialize> buffer
1.127.2.22.2. 4(paf 435:3): String::C serialized=info.evaluated_body->serialize(
436:3): sizeof(Data_string_serialized_prolog));
1.79 paf 437: Data_string_serialized_prolog& prolog=
1.127.2.22.2. 4(paf 438:3): *reinterpret_cast<Data_string_serialized_prolog *>(serialized.str);
1.79 paf 439: prolog.version=DATA_STRING_SERIALIZED_VERSION;
440: prolog.expires=info.data->expires;
441:
442: // buffer -write> file
1.127.2.22.2. 4(paf 443:3): write(f, serialized.str, serialized.length);
1.79 paf 444: } else // expired!
445: info.data->expires=0; // flag it so that could be easily checked by caller
1.69 paf 446: }
1.127.2.22.2. 4(paf 447:3): const String* locked_process_and_cache_put(Request& r,
448:3): Value& body_code,
449:3): Cache_data& data,
450:3): const String& file_spec) {
1.127.2.10 paf 451: Locked_process_and_cache_put_action_info info;
452: info.r=&r;
453: info.data=&data;
1.127.2.22.2. 4(paf 454:3): info.body_code=&body_code;
1.69 paf 455:
1.127.2.22.2. 4(paf 456:3): const String* result=file_write_action_under_lock(
1.69 paf 457: file_spec,
458: "cache_put", locked_process_and_cache_put_action, &info,
459: false/*as_text*/,
460: false/*do_append*/,
1.96 paf 461: false/*block*/,
1.127.2.22.2. (paf 462:): false/*fail on lock problem*/) ? info.evaluated_body: 0;
1.100 paf 463: time_t now=time(0);
464: if(data.expires<=now)
1.79 paf 465: cache_delete(file_spec);
466: return result;
1.63 paf 467: }
1.127.2.22.2. 4(paf 468:3): const String* cache_get(Charset& charset, const String& file_spec, time_t now) {
(paf 469:): File_read_result file=file_read(charset, file_spec,
1.63 paf 470: false/*as_text*/,
1.127.2.10 paf 471: 0, //no params
472: false/*fail_on_read_problem*/);
1.127.2.22.2. 4(paf 473:3): if(file.success && file.length/* ignore reads which are empty due to
1.72 paf 474: non-unary open+lockEX conflict with lockSH */) {
1.127.2.10 paf 475:
1.72 paf 476: Data_string_serialized_prolog& prolog=
1.127.2.22.2. 4(paf 477:3): *reinterpret_cast<Data_string_serialized_prolog *>(file.str);
1.63 paf 478:
1.127.2.22.2. 4(paf 479:3): String* result=new String;
1.72 paf 480: if(
1.127.2.22.2. 4(paf 481:3): file.length>=sizeof(Data_string_serialized_prolog)
1.72 paf 482: && prolog.version==DATA_STRING_SERIALIZED_VERSION
1.79 paf 483: && prolog.expires > now
1.127.2.22.2. 4(paf 484:3): && result->deserialize(sizeof(Data_string_serialized_prolog), file.str, file.length))
1.72 paf 485: return result;
486: }
1.63 paf 487:
1.127.2.22.2. (paf 488:): return 0;
1.63 paf 489: }
1.127.2.22.2. 2(paf 490:3): static time_t as_expires(Request& r, MethodParams* params,
1.79 paf 491: int index, time_t now) {
492: time_t result;
1.127.2.13 paf 493: if(Value* vdate=(*params)[index]->as(VDATE_TYPE, false))
1.127.2.10 paf 494: result=static_cast<VDate*>(vdate)->get_time();
1.79 paf 495: else
1.127.2.13 paf 496: result=now+(time_t)params->as_double(index, "lifespan must be date or number", r);
1.79 paf 497:
498: return result;
499: }
1.127.2.22.2. (paf 500:): static const String& as_file_spec(Request& r, MethodParams* params, int index) {
1.127.2.13 paf 501: return r.absolute(params->as_string(index, "filespec must be string"));
1.79 paf 502: }
1.127.2.22.2. 2(paf 503:3): static void _cache(Request& r, MethodParams* params) {
1.79 paf 504: time_t now=time(0);
505:
506: // ^cache[filename] ^cache(seconds) ^cache[expires date]
1.127.2.13 paf 507: if(params->count()==1) {
508: if((*params)[0]->is_string()) { // filename?
1.79 paf 509: cache_delete(as_file_spec(r, params, 0));
510: return;
511: }
512:
513: // secods|expires date
1.127.2.22.2. 4(paf 514:3): Cache_data* data=static_cast<Cache_data*>(r.classes_conf.get(cache_data_name));
1.79 paf 515: if(!data)
516: throw Exception("parser.runtime",
1.127.2.22.2. 4(paf 517:3): 0,
1.79 paf 518: "expire-time reducing instruction without cache");
519:
1.127.2.22.2. 4(paf 520:3): time_t expires=as_expires(r, params, 0, now);
1.79 paf 521: if(expires < data->expires)
522: data->expires=expires;
523:
524: return;
525: }
1.63 paf 526:
527: // file_spec, expires, body code
1.127.2.22.2. (paf 528:): const String& file_spec=r.absolute(params->as_string(0, "filespec must be string"));
1.65 paf 529:
1.127.2.22.2. 4(paf 530:3): Cache_data* data=new Cache_data;
5(paf 531:3): Temp_hash_value<const StringBody, PA_Object*>
1.127.2.10 paf 532: cache_data_setter(r.classes_conf, cache_data_name, data);
1.127.2.22.2. 4(paf 533:3): data->expires=as_expires(r, params, 1, now);
534:3): Value& body_code=params->as_junction(2, "body must be code");
1.63 paf 535:
1.127.2.10 paf 536: if(data->expires>now) { // valid 'expires' specified? try cached copy...
1.69 paf 537: // hence we don't hope to have unary create/lockEX
538: // we need some plan to live in a life like that, so...
539: // worst races plan:
540: // A B
541: // open
542: // |open
543: // lockSH
544: // |nonblocking-lockEX fails
545: // unlockSH
546: // close, cache_get returns 0
547: // open
548: // nonblocking-lockEX succeeds; process, write, close
549: // |retry1: open
550: // ...
551: // |lockSH succeeds; ...
552:
553: for(int retry=0; retry<2; retry++) {
1.127.2.22.2. 4(paf 554:3): if(const String* cached_body=cache_get(r.charsets.source(), file_spec, now)) { // have cached copy?
1.79 paf 555: // write it out
556: r.write_assign_lang(*cached_body);
557: // happy with it
558: return;
559: }
1.69 paf 560:
561: // non-blocked lock; process; cache it
1.127.2.22.2. 4(paf 562:3): if(const String* processed_body=
1.127.2.10 paf 563: locked_process_and_cache_put(r, body_code, *data, file_spec)) {
1.63 paf 564: // write it out
1.69 paf 565: r.write_assign_lang(*processed_body);
1.63 paf 566: // happy with it
567: return;
1.69 paf 568: } else { // somebody writing result right now
569: pa_sleep(0, 500000); // waiting half a second
570: retry=0; // prolonging our wait, than could cache_get it, without processing body_code
1.63 paf 571: }
1.69 paf 572: }
1.78 paf 573: throw Exception(0,
1.127.2.22.2. 4(paf 574:3): &file_spec,
1.69 paf 575: "locking problem");
576: } else {
1.79 paf 577: // instructed not to cache; forget cached copy
1.68 paf 578: cache_delete(file_spec);
1.69 paf 579: // process
1.127.2.22.2. (paf 580:): const String& processed_body=r.process_to_string(body_code);
1.69 paf 581: // write it out
1.127.2.22.2. 4(paf 582:3): r.write_assign_lang(processed_body);
1.69 paf 583: // happy with it
584: return;
585: }
586: // never reached
1.63 paf 587: }
588:
1.74 paf 589: // also used in pa_request.C to pass param to @unhandled_exception
1.127.2.22.2. 4(paf 590:3): VHash& exception2vhash(const Exception& e) {
(paf 591:): VHash& result=*new VHash;
4(paf 592:3): HashStringValue& hash=result.hash();
1.127.2.5 paf 593: if(const char* type=e.type(true))
1.127.2.22.2. 4(paf 594:3): hash.put(exception_type_part_name, new VString(*new String(type)));
595:3): if(const String* asource=e.problem_source()) {
596:3): String& source=*new String;
597:3): source.append(*asource, String::L_TAINTED, true/*forced*/);
1.74 paf 598:
1.127.2.22.2. 4(paf 599:3): hash.put(exception_source_part_name, new VString(source));
1.74 paf 600: }
1.127.2.22.2. 4(paf 601:3): if(const char* comment=e.comment(true))
1.127.2.10 paf 602: hash.put(exception_comment_part_name,
1.127.2.22.2. 4(paf 603:3): new VString(*new String(comment, 0, true/*tainted*/)));
604:3): hash.put(exception_handled_part_name, new VBool(false));
1.74 paf 605:
606: return result;
607: }
608:
1.127.2.22.2. 2(paf 609:3): static void _try_operator(Request& r, MethodParams* params) {
4(paf 610:3): Value& body_code=params->as_junction(0, "body_code must be code");
611:3): Value& catch_code=params->as_junction(1, "catch_code must be code");
1.74 paf 612:
1.86 paf 613: StringOrValue result;
1.123 paf 614: // taking snapshot of try-context
615: Request_context_saver try_context(r);
1.74 paf 616: try {
1.86 paf 617: result=r.process(body_code);
1.74 paf 618: } catch(const Exception& e) {
1.123 paf 619: Request_context_saver throw_context(r); // taking snapshot of throw-context [stack trace contains error]
620: try_context.restore(); // restoring try-context to perform catch-code
621:
1.127.2.22.2. 4(paf 622:3): VHash& vhash=exception2vhash(e);
1.74 paf 623:
1.127.2.22.2. 4(paf 624:3): Junction* junction=catch_code.get_junction();
1.127.2.10 paf 625: Value* method_frame=junction->method_frame;
1.127.2.22.2. (paf 626:): Value* saved_exception_var_value=method_frame->get_element(exception_var_name, *method_frame, false);
4(paf 627:3): junction->method_frame->put_element(exception_var_name, &vhash, false);
1.86 paf 628: result=r.process(catch_code);
1.74 paf 629: bool handled=false;
1.127.2.22.2. (paf 630:): if(Value* value=
4(paf 631:3): vhash.hash().get(exception_handled_part_name))
1.74 paf 632: handled=value->as_bool();
1.127.2.10 paf 633: junction->method_frame->put_element(exception_var_name, saved_exception_var_value, false);
1.74 paf 634:
1.123 paf 635: if(!handled) {
636: throw_context.restore(); // restoring throw-context [exception were not handled]
1.74 paf 637: throw(e); // rethrow
1.123 paf 638: }
1.74 paf 639: }
1.123 paf 640: // write out result
1.86 paf 641: r.write_pass_lang(result);
1.74 paf 642: }
643:
1.127.2.22.2. 2(paf 644:3): static void _throw_operator(Request& r, MethodParams* params) {
1.127.2.13 paf 645: if(params->count()==1) {
1.127.2.22.2. (paf 646:): Value* param0=(*params)[0];
2(paf 647:3): if(HashStringValue *hash=param0->get_hash()) {
1.127.2.5 paf 648: const char* type=0;
1.127.2.22.2. (paf 649:): if(Value* value=hash->get(exception_type_part_name))
650:): type=value->as_string().cstr();
4(paf 651:3): const String* source=0;
(paf 652:): if(Value* value=hash->get(exception_source_part_name))
4(paf 653:3): source=&value->as_string();
(paf 654:): const char* comment;
655:): if(Value* value=hash->get(exception_comment_part_name))
656:): comment=value->as_string().cstr();
1.74 paf 657:
1.78 paf 658: throw Exception(type,
1.127.2.22.2. 4(paf 659:3): source?source:0,
660:3): "%s", comment?comment:"");
1.74 paf 661: } else
1.78 paf 662: throw Exception("parser.runtime",
1.127.2.22.2. 4(paf 663:3): 0,
1.74 paf 664: "one-param version has hash param");
665: } else {
1.127.2.22.2. 4(paf 666:3): const char* type=params->as_string(0, "type must be string").cstr();
667:3): const String& source=params->as_string(1, "source must be string");
668:3): const char* comment=params->count()>2? params->as_string(2, "comment must be string").cstr()
1(paf 669:3): :0;
4(paf 670:3): throw Exception(type, &source, "%s", comment?comment:"");
1.74 paf 671: }
672: }
1.127.2.20 paf 673:
674: #if defined(WIN32) && defined(_DEBUG)
675: # define PA_BPT
1.127.2.22.2. 2(paf 676:3): static void _bpt(Request& r, MethodParams* params) {
1.127.2.20 paf 677: _asm int 3;
678: }
679: #endif
680:
1.10 paf 681: // constructor
682:
1.127.2.10 paf 683: VClassMAIN::VClassMAIN(): VClass() {
1.127.2.22.2. 4(paf 684:3): set_name(*new String(MAIN_CLASS_NAME));
1.127.2.20 paf 685:
686: #ifdef PA_BPT
687: // ^bpt[]
688: add_native_method("bpt", Method::CT_ANY, _bpt, 0, 0);
689: #endif
1.121 paf 690:
1.1 paf 691: // ^if(condition){code-when-true}
692: // ^if(condition){code-when-true}{code-when-false}
1.10 paf 693: add_native_method("if", Method::CT_ANY, _if, 2, 3);
1.1 paf 694:
695: // ^untaint[as-is|uri|sql|js|html|html-typo]{code}
1.59 paf 696: add_native_method("untaint", Method::CT_ANY, _untaint, 1, 2);
1.1 paf 697:
698: // ^taint[as-is|uri|sql|js|html|html-typo]{code}
1.10 paf 699: add_native_method("taint", Method::CT_ANY, _taint, 1, 2);
1.1 paf 700:
701: // ^process[code]
1.116 paf 702: add_native_method("process", Method::CT_ANY, _process, 1, 2);
1.1 paf 703:
704: // ^rem{code}
1.51 parser 705: add_native_method("rem", Method::CT_ANY, _rem, 1, 10000);
1.1 paf 706:
707: // ^while(condition){code}
1.10 paf 708: add_native_method("while", Method::CT_ANY, _while, 2, 2);
1.1 paf 709:
710: // ^use[file]
1.10 paf 711: add_native_method("use", Method::CT_ANY, _use, 1, 1);
1.1 paf 712:
1.54 paf 713: // ^for[i](from-number;to-number-inclusive){code}[delim]
1.10 paf 714: add_native_method("for", Method::CT_ANY, _for, 3+1, 3+1+1);
1.1 paf 715:
716: // ^eval(expr)
717: // ^eval(expr)[format]
1.10 paf 718: add_native_method("eval", Method::CT_ANY, _eval, 1, 2);
1.52 parser 719:
1.1 paf 720: // ^connect[protocol://user:pass@host[:port]/database]{code with ^sql-s}
1.10 paf 721: add_native_method("connect", Method::CT_ANY, _connect, 2, 2);
722:
1.63 paf 723:
1.65 paf 724: // ^cache[file_spec] delete cache
1.63 paf 725: // ^cache[file_spec](time){code} time=0 no cache
1.65 paf 726: add_native_method("cache", Method::CT_ANY, _cache, 1, 3);
1.63 paf 727:
1.28 parser 728: // switch
729:
730: // ^switch[value]{cases}
731: add_native_method("switch", Method::CT_ANY, _switch, 2, 2);
732:
733: // ^case[value]{code}
1.51 parser 734: add_native_method("case", Method::CT_ANY, _case, 2, 10000);
1.74 paf 735:
736: // try-catch
737:
738: // ^try{code}{catch code}
739: add_native_method("try", Method::CT_ANY, _try_operator, 2, 2);
740: // ^throw[$exception hash]
741: // ^throw[type;source;comment]
742: add_native_method("throw", Method::CT_ANY, _throw_operator, 1, 3);
743:
1.10 paf 744: }
1.11 paf 745:
746: // constructor & configurator
1.1 paf 747:
1.127.2.22.2. 4(paf 748:3): VStateless_class& VClassMAIN_create() {
749:3): return *new VClassMAIN;
1.1 paf 750: }
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