Annotation of parser3/src/classes/op.C, revision 1.127.2.22.2.33
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. 3(paf 8:3): static const char* IDENT_OP_C="$Date: 2003/04/08 16:11:53 $";
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:
42: // statics
43:
44: //^switch ^case
1.127.2.22.2. 3(paf 45:3): static const String switch_data_name(SWITCH_DATA_NAME);
1.127.2.10 paf 46: //^cache
1.127.2.22.2. 3(paf 47:3): static const String cache_data_name(CACHE_DATA_NAME);
1.127.2.10 paf 48:
1.127.2.22.2. 3(paf 49:3): static const String exception_var_name(EXCEPTION_VAR_NAME);
1.127.2.10 paf 50:
1.127.2.1 paf 51: // helpers
52:
1.127.2.22.2. 6(paf 53:3): class Untaint_lang_name2enum: public Hash<const StringBody, String::Language> {
1.127.2.10 paf 54: public:
55: Untaint_lang_name2enum() {
56: #define ULN(name, LANG) \
1.127.2.22.2. 4(paf 57:3): put(StringBody(name), (value_type)(String::L_##LANG));
1.127.2.10 paf 58: ULN("as-is", AS_IS);
1.127.2.22.2. (paf 59:): ULN("optimized-as-is", AS_IS|String::L_OPTIMIZE_BIT);
1.127.2.10 paf 60: ULN("file-spec", FILE_SPEC);
61: ULN("http-header", HTTP_HEADER);
62: ULN("mail-header", MAIL_HEADER);
63: ULN("uri", URI);
64: ULN("table", TABLE);
65: ULN("sql", SQL);
66: ULN("js", JS);
67: ULN("xml", XML);
1.127.2.22.2. (paf 68:): ULN("optimized-xml", XML|String::L_OPTIMIZE_BIT);
1.127.2.10 paf 69: ULN("html", HTML);
1.127.2.22.2. (paf 70:): ULN("optimized-html", HTML|String::L_OPTIMIZE_BIT);
1.127.2.10 paf 71: #undef ULN
72: }
73: } untaint_lang_name2enum;
1.127.2.1 paf 74:
1.10 paf 75: // methods
76:
1.127.2.22.2. 7(paf 77:3): static void _if(Request& r, MethodParams& params) {
78:3): Value& condition_code=params.as_junction(0, "condition must be expression");
1.1 paf 79:
1.81 paf 80: bool condition=r.process_to_value(condition_code,
1.83 paf 81: /*0/*no name* /,*/
1.127.2.22.2. 4(paf 82:3): false/*don't intercept string*/).as_bool();
1.6 paf 83: if(condition)
1.127.2.22.2. 7(paf 84:3): r.write_pass_lang(r.process(params.as_junction(1, "'then' parameter must be code")));
85:3): else if(params.count()>2)
86:3): r.write_pass_lang(r.process(params.as_junction(2, "'else' parameter must be code")));
1.1 paf 87: }
88:
1.127.2.22.2. 7(paf 89:3): static void _untaint(Request& r, MethodParams& params) {
1.1 paf 90:
1.127.2.22.2. 4(paf 91:3): String::Language lang;
7(paf 92:3): if(params.count()==1)
(paf 93:): lang=String::L_AS_IS; // mark as simply 'tainted'. useful in html from sql
1.59 paf 94: else {
1.127.2.22.2. 7(paf 95:3): const String& lang_name=params.as_string(0, "lang must be string");
1.127.2.10 paf 96: lang=untaint_lang_name2enum.get(lang_name);
1.59 paf 97: if(!lang)
1.78 paf 98: throw Exception(0,
1.127.2.22.2. 4(paf 99:3): &lang_name,
1.59 paf 100: "invalid taint language");
101: }
1.1 paf 102:
103: {
1.127.2.22.2. 7(paf 104:3): Value& vbody=params.as_junction(params.count()-1, "body must be code");
1.1 paf 105:
106: Temp_lang temp_lang(r, lang); // set temporarily specified ^untaint[language;
1.86 paf 107: r.write_pass_lang(r.process(vbody)); // process marking tainted with that lang
1.1 paf 108: }
109: }
110:
1.127.2.22.2. 7(paf 111:3): static void _taint(Request& r, MethodParams& params) {
4(paf 112:3): String::Language lang;
7(paf 113:3): if(params.count()==1)
(paf 114:): lang=String::L_TAINTED; // mark as simply 'tainted'. useful in table:set
1.1 paf 115: else {
1.127.2.22.2. 7(paf 116:3): const String& lang_name=params.as_string(0, "lang must be string");
1.127.2.10 paf 117: lang=untaint_lang_name2enum.get(lang_name);
1.1 paf 118: if(!lang)
1.78 paf 119: throw Exception(0,
1.127.2.22.2. 4(paf 120:3): &lang_name,
1.3 paf 121: "invalid taint language");
1.1 paf 122: }
123:
124: {
1.127.2.22.2. 7(paf 125:3): Value& vbody=params.as_no_junction(params.count()-1, "body must not be code");
1.1 paf 126:
1.127.2.10 paf 127: String result;
1.1 paf 128: result.append(
1.127.2.22.2. 4(paf 129:3): vbody.as_string(), // process marking tainted with that lang
1.1 paf 130: lang, true); // force result language to specified
131: r.write_pass_lang(result);
132: }
133: }
134:
1.127.2.22.2. 7(paf 135:3): static void _process(Request& r, MethodParams& params) {
(paf 136:): Method* main_method;
7(paf 137:3):
9(paf 138:3): size_t index=0;
139:3): Value* target_self;
140:3): Value& maybe_target_self=params[index];
141:3): if(maybe_target_self.get_string() || maybe_target_self.get_junction())
142:3): target_self=&r.get_method_frame()->caller()->self();
143:3): else {
144:3): target_self=&maybe_target_self; index++;
145:3): }
146:3):
1.1 paf 147: {
1.127.2.22.2. 9(paf 148:3): VStateless_class *target_class=target_self->get_last_derived_class();
1.116 paf 149: if(!target_class)
150: throw Exception("parser.runtime",
1.127.2.22.2. 4(paf 151:3): 0,
1.116 paf 152: "no target class");
1.114 paf 153:
1.73 paf 154: // temporary remove language change
1.127.2.22.2. (paf 155:): Temp_lang temp_lang(r, String::L_PASS_APPENDED);
1.1 paf 156: // temporary zero @main so to maybe-replace it in processed code
1.127.2.22.2. 4(paf 157:3): Temp_method temp_method_main(*target_class, main_method_name, 0);
1.1 paf 158: // temporary zero @auto so it wouldn't be auto-called in Request::use_buf
1.127.2.22.2. 4(paf 159:3): Temp_method temp_method_auto(*target_class, auto_method_name, 0);
6(paf 160:3):
9(paf 161:3): size_t main_alias_index=index+1;
162:3): const String* main_alias=0;
163:3): if(main_alias_index<params.count())
164:3): main_alias=¶ms.as_string(main_alias_index, "main alias must be string");
165:3):
166:3): if(const String* file_name=params[index].get_string()) { // ^process...[file]
167:3): r.use_file(*target_class, r.absolute(*file_name), main_alias, true/*ignore_class_path*/);
6(paf 168:3): } else { // process...{string}
9(paf 169:3): Value& vjunction=params.as_junction(index, "body must be code");
6(paf 170:3): // evaluate source to process
171:3): const String& source=r.process_to_string(vjunction);
172:3): r.use_buf(*target_class,
173:3): source.cstr(String::L_UNSPECIFIED, r.connection(false)),
9(paf 174:3): main_alias,
6(paf 175:3): pseudo_file_no__process);
176:3): }
177:3):
1.73 paf 178: // main_method
1.127.2.10 paf 179: main_method=target_class->get_method(main_method_name);
1.73 paf 180: }
181: // after restoring current-request-lang
182: // maybe-execute @main[]
183: if(main_method) {
1.119 paf 184: // temporarily set method_frame's self to target_self
1.127.2.22.2. 9(paf 185:3): Temp_method_frame_self tmfs(*r.get_method_frame(), *target_self);
1.73 paf 186: // execute!
187: r.execute(*main_method->parser_code);
1.1 paf 188: }
189: }
190:
1.127.2.22.2. 7(paf 191:3): static void _rem(Request& r, MethodParams& params) {
192:3): params.as_junction(0, "body must be code");
1.1 paf 193: }
194:
1.127.2.22.2. 7(paf 195:3): static void _while(Request& r, MethodParams& params) {
196:3): Value& vcondition=params.as_junction(0, "condition must be expression");
197:3): Value& body=params.as_junction(1, "body must be code");
1.1 paf 198:
199: // while...
200: int endless_loop_count=0;
201: while(true) {
1.18 parser 202: if(++endless_loop_count>=MAX_LOOPS) // endless loop?
1.78 paf 203: throw Exception("parser.runtime",
1.127.2.22.2. 4(paf 204:3): 0,
1.1 paf 205: "endless loop detected");
206:
1.86 paf 207: bool condition=r.process_to_value(vcondition,
1.83 paf 208: /*0/*no name* /,*/
1.127.2.22.2. 4(paf 209:3): false/*don't intercept string*/).as_bool();
1.1 paf 210: if(!condition) // ...condition is true
211: break;
212:
213: // write processed body
1.86 paf 214: r.write_pass_lang(r.process(body));
1.1 paf 215: }
216: }
217:
1.127.2.22.2. 7(paf 218:3): static void _use(Request& r, MethodParams& params) {
219:3): Value& vfile=params.as_no_junction(0, "file name must not be code");
4(paf 220:3): r.use_file(r.main_class, vfile.as_string());
1.1 paf 221: }
222:
1.127.2.22.2. 7(paf 223:3): static void _for(Request& r, MethodParams& params) {
224:3): const String& var_name=params.as_string(0, "var name must be string");
225:3): int from=params.as_int(1, "from must be int", r);
226:3): int to=params.as_int(2, "to must be int", r);
227:3): Value& body_code=params.as_junction(3, "body must be code");
8(paf 228:3): Value* delim_maybe_code=params.count()>4?¶ms[4]:0;
1.1 paf 229:
1.57 paf 230: if(to-from>=MAX_LOOPS) // too long loop?
1.78 paf 231: throw Exception("parser.runtime",
1.127.2.22.2. 4(paf 232:3): 0,
1.57 paf 233: "endless loop detected");
234:
1.1 paf 235: bool need_delim=false;
1.127.2.22.2. 4(paf 236:3): VInt* vint=new VInt(0);
1.117 paf 237: r.get_method_frame()->caller()->put_element(var_name, vint, false);
1.1 paf 238: for(int i=from; i<=to; i++) {
239: vint->set_int(i);
240:
1.108 paf 241: StringOrValue sv_processed=r.process(body_code);
1.127.2.22.2. 4(paf 242:3): const String* s_processed=sv_processed.get_string();
(paf 243:): if(delim_maybe_code && s_processed && s_processed->length()) { // delimiter set and we have body
1.108 paf 244: if(need_delim) // need delim & iteration produced string?
1.127.2.22.2. 4(paf 245:3): r.write_pass_lang(r.process(*delim_maybe_code));
1.1 paf 246: need_delim=true;
247: }
1.108 paf 248: r.write_pass_lang(sv_processed);
1.1 paf 249: }
250: }
251:
1.127.2.22.2. 7(paf 252:3): static void _eval(Request& r, MethodParams& params) {
253:3): Value& expr=params.as_junction(0, "need expression");
1.1 paf 254: // evaluate expresion
1.127.2.22.2. 1(paf 255:3): Value& value_result=r.process_to_value(expr,
1.83 paf 256: /*0/*no name YET* /,*/
1.127.2.22.2. 4(paf 257:3): true/*don't intercept string*/).as_expr_result();
7(paf 258:3): if(params.count()>1) {
259:3): Value& fmt=params.as_no_junction(1, "fmt must not be code");
4(paf 260:3): r.write_no_lang(String(format(value_result.as_double(), fmt.as_string().cstrm())));
1.91 paf 261: } else
1.127.2.10 paf 262: r.write_no_lang(value_result);
1.1 paf 263: }
264:
1.127.2.22.2. 7(paf 265:3): static void _connect(Request& r, MethodParams& params) {
1.63 paf 266: #ifdef RESOURCES_DEBUG
267: struct timeval mt[2];
268: #endif
1.127.2.22.2. 7(paf 269:3): Value& url=params.as_no_junction(0, "url must not be code");
270:3): Value& body_code=params.as_junction(1, "body must be code");
1.1 paf 271:
1.127.2.10 paf 272: Table* protocol2driver_and_client=0;
1.127.2.22.2. 4(paf 273:3): if(Value* sql=r.main_class.get_element(String(MAIN_SQL_NAME), r.main_class, false)) {
274:3): if(Value* element=sql->get_element(String(MAIN_SQL_DRIVERS_NAME), *sql, false)) {
1.113 paf 275: protocol2driver_and_client=element->get_table();
276: }
277: }
1.11 paf 278:
1.63 paf 279: #ifdef RESOURCES_DEBUG
280: //measure:before
281: gettimeofday(&mt[0],NULL);
282: #endif
1.1 paf 283: // connect
1.127.2.22.2. 4(paf 284:3): SQL_Connection* connection=SQL_driver_manager.get_connection(url.as_string(),
285:3): protocol2driver_and_client);
1.1 paf 286:
1.63 paf 287: #ifdef RESOURCES_DEBUG
288: //measure:after connect
289: gettimeofday(&mt[1],NULL);
290:
291: double t[2];
292: for(int i=0;i<2;i++)
293: t[i]=mt[i].tv_sec+mt[i].tv_usec/1000000.0;
294:
295: r.sql_connect_time+=t[1]-t[0];
296: #endif
1.127.2.22.2. 4(paf 297:3): Temp_connection temp_connection(r, connection);
1.1 paf 298: // execute body
1.53 parser 299: try {
1.86 paf 300: r.write_assign_lang(r.process(body_code));
1.75 paf 301: } catch(...) { // process problem
1.67 paf 302: connection->mark_to_rollback();
1.127.2.6 paf 303: rethrow;
1.1 paf 304: }
305: }
306:
1.41 parser 307: #ifndef DOXYGEN
1.127.2.10 paf 308: class Switch_data: public PA_Object {
309: public:
310: Request& r;
1.127.2.22.2. 4(paf 311:3): Value& searching;
(paf 312:): Value* found;
313:): Value* _default;
1.127.2.10 paf 314: public:
1.127.2.22.2. 4(paf 315:3): Switch_data(Request& ar, Value& asearching):
1.127.2.10 paf 316: r(ar), searching(asearching) {}
1.28 parser 317: };
1.41 parser 318: #endif
1.127.2.22.2. 7(paf 319:3): static void _switch(Request& r, MethodParams& params) {
8(paf 320:3): Switch_data* data=new Switch_data(r, r.process_to_value(params[0]));
5(paf 321:3): Temp_hash_value<const StringBody, PA_Object*>
1.127.2.10 paf 322: switch_data_setter(r.classes_conf, switch_data_name, data);
1.28 parser 323:
1.127.2.22.2. 7(paf 324:3): Value& cases_code=params.as_junction(1, "switch cases must be code");
1.82 paf 325: // execution of found ^case[...]{code} must be in context of ^switch[...]{code}
326: // because of stacked WWrapper used there as wcontext
1.84 paf 327: r.process(cases_code, true/*intercept_string*/);
1.127.2.22.2. (paf 328:): if(Value* selected_code=data->found? data->found: data->_default) {
1.83 paf 329: // setting code context, would execute in ^switch[...]{>>context<<}
1.105 paf 330: //selected_code->get_junction()->change_context(cases_code.get_junction());
1.127.2.22.2. 4(paf 331:3): r.write_pass_lang(r.process(*selected_code));
1.83 paf 332: }
1.28 parser 333: }
334:
1.127.2.22.2. 7(paf 335:3): static void _case(Request& r, MethodParams& params) {
4(paf 336:3): Switch_data* data=static_cast<Switch_data*>(r.classes_conf.get(switch_data_name));
1.38 parser 337: if(!data)
1.78 paf 338: throw Exception("parser.runtime",
1.127.2.22.2. 4(paf 339:3): 0,
1.38 parser 340: "without switch");
1.28 parser 341:
1.127.2.22.2. 7(paf 342:3): int count=params.count();
343:3): Value& code=params.as_junction(--count, "case result must be code");
1.83 paf 344:
345: // killing context for safety, would execute in ^switch[...]{>>context<<}
346: // reason: context is stacked, and it would become invalid afterwards
1.105 paf 347: //code->get_junction()->change_context(0);
1.83 paf 348:
1.28 parser 349: for(int i=0; i<count; i++) {
1.127.2.22.2. 8(paf 350:3): Value& value=r.process_to_value(params[i]);
1.28 parser 351:
1.127.2.22.2. 4(paf 352:3): if(value.as_string() == CASE_DEFAULT_VALUE) {
353:3): data->_default=&code;
1.28 parser 354: break;
355: }
356:
357: bool matches;
1.127.2.22.2. 4(paf 358:3): if(data->searching.is_string())
359:3): matches=data->searching.as_string() == value.as_string();
1.28 parser 360: else
1.127.2.22.2. 4(paf 361:3): matches=data->searching.as_double() == value.as_double();
1.28 parser 362:
363: if(matches) {
1.82 paf 364: if(data->found)
365: throw Exception("parser.runtime",
1.127.2.22.2. 4(paf 366:3): 0,
1.82 paf 367: "duplicate found");
368:
1.127.2.22.2. 4(paf 369:3): data->found=&code;
1.28 parser 370: break;
371: }
372: }
373: }
374:
1.63 paf 375: // cache--
376:
377: // consts
378:
1.127.2.22.2. (paf 379:): const int DATA_STRING_SERIALIZED_VERSION=0x0004;
1.63 paf 380:
381: // helper types
382:
383: #ifndef DOXYGEN
384: struct Data_string_serialized_prolog {
385: int version;
1.79 paf 386: time_t expires;
1.63 paf 387: };
388: #endif
389:
1.127.2.22.2. (paf 390:): void cache_delete(const String& file_spec) {
1.68 paf 391: file_delete(file_spec, false/*fail_on_read_problem*/);
1.63 paf 392: }
1.69 paf 393:
394: #ifndef DOXYGEN
1.127.2.10 paf 395: class Cache_data: public PA_Object {
396: public:
1.79 paf 397: time_t expires;
398: };
1.69 paf 399: struct Locked_process_and_cache_put_action_info {
400: Request *r;
1.79 paf 401: Cache_data *data;
1.127.2.22.2. 4(paf 402:3): Value* body_code; const String* evaluated_body;
1.69 paf 403: };
404: #endif
1.127.2.2 paf 405: /* @todo maybe network order worth spending some effort?
406: don't bothering myself with network byte order,
407: am not planning to be able to move resulting file across platforms
408: */
1.69 paf 409: static void locked_process_and_cache_put_action(int f, void *context) {
410: Locked_process_and_cache_put_action_info& info=
411: *static_cast<Locked_process_and_cache_put_action_info *>(context);
1.127.2.10 paf 412:
1.69 paf 413: // body->process
1.127.2.22.2. 4(paf 414:3): info.evaluated_body=&info.r->process_to_string(*info.body_code);
1.69 paf 415:
1.79 paf 416: // expiration time not spoiled by ^cache(0) or something?
417: if(info.data->expires > time(0)) {
418: // string -serialize> buffer
1.127.2.22.2. 1(paf 419:3): String::Cm serialized=info.evaluated_body->serialize(
4(paf 420:3): sizeof(Data_string_serialized_prolog));
1.79 paf 421: Data_string_serialized_prolog& prolog=
1.127.2.22.2. 4(paf 422:3): *reinterpret_cast<Data_string_serialized_prolog *>(serialized.str);
1.79 paf 423: prolog.version=DATA_STRING_SERIALIZED_VERSION;
424: prolog.expires=info.data->expires;
425:
426: // buffer -write> file
1.127.2.22.2. 4(paf 427:3): write(f, serialized.str, serialized.length);
1.79 paf 428: } else // expired!
429: info.data->expires=0; // flag it so that could be easily checked by caller
1.69 paf 430: }
1.127.2.22.2. 4(paf 431:3): const String* locked_process_and_cache_put(Request& r,
432:3): Value& body_code,
433:3): Cache_data& data,
434:3): const String& file_spec) {
3(paf 435:3): Locked_process_and_cache_put_action_info info={0};
1.127.2.10 paf 436: info.r=&r;
437: info.data=&data;
1.127.2.22.2. 4(paf 438:3): info.body_code=&body_code;
1.69 paf 439:
1.127.2.22.2. 4(paf 440:3): const String* result=file_write_action_under_lock(
1.69 paf 441: file_spec,
442: "cache_put", locked_process_and_cache_put_action, &info,
443: false/*as_text*/,
444: false/*do_append*/,
1.96 paf 445: false/*block*/,
1.127.2.22.2. (paf 446:): false/*fail on lock problem*/) ? info.evaluated_body: 0;
1.100 paf 447: time_t now=time(0);
448: if(data.expires<=now)
1.79 paf 449: cache_delete(file_spec);
450: return result;
1.63 paf 451: }
1.127.2.22.2. 2(paf 452:3): const String* cache_get(Request_charsets& charsets, const String& file_spec, time_t now) {
453:3): File_read_result file=file_read(charsets, file_spec,
1.63 paf 454: false/*as_text*/,
1.127.2.10 paf 455: 0, //no params
456: false/*fail_on_read_problem*/);
1.127.2.22.2. 4(paf 457:3): if(file.success && file.length/* ignore reads which are empty due to
1.72 paf 458: non-unary open+lockEX conflict with lockSH */) {
1.127.2.10 paf 459:
1.72 paf 460: Data_string_serialized_prolog& prolog=
1.127.2.22.2. 4(paf 461:3): *reinterpret_cast<Data_string_serialized_prolog *>(file.str);
1.63 paf 462:
1.127.2.22.2. 4(paf 463:3): String* result=new String;
1.72 paf 464: if(
1.127.2.22.2. 4(paf 465:3): file.length>=sizeof(Data_string_serialized_prolog)
1.72 paf 466: && prolog.version==DATA_STRING_SERIALIZED_VERSION
1.79 paf 467: && prolog.expires > now
1.127.2.22.2. 4(paf 468:3): && result->deserialize(sizeof(Data_string_serialized_prolog), file.str, file.length))
1.72 paf 469: return result;
470: }
1.63 paf 471:
1.127.2.22.2. (paf 472:): return 0;
1.63 paf 473: }
1.127.2.22.2. 7(paf 474:3): static time_t as_expires(Request& r, MethodParams& params,
1.79 paf 475: int index, time_t now) {
476: time_t result;
1.127.2.22.2. 8(paf 477:3): if(Value* vdate=params[index].as(VDATE_TYPE, false))
1.127.2.10 paf 478: result=static_cast<VDate*>(vdate)->get_time();
1.79 paf 479: else
1.127.2.22.2. 7(paf 480:3): result=now+(time_t)params.as_double(index, "lifespan must be date or number", r);
1.79 paf 481:
482: return result;
483: }
1.127.2.22.2. 7(paf 484:3): static const String& as_file_spec(Request& r, MethodParams& params, int index) {
485:3): return r.absolute(params.as_string(index, "filespec must be string"));
1.79 paf 486: }
1.127.2.22.2. 7(paf 487:3): static void _cache(Request& r, MethodParams& params) {
1.79 paf 488: time_t now=time(0);
489:
490: // ^cache[filename] ^cache(seconds) ^cache[expires date]
1.127.2.22.2. 7(paf 491:3): if(params.count()==1) {
8(paf 492:3): if(params[0].is_string()) { // filename?
1.79 paf 493: cache_delete(as_file_spec(r, params, 0));
494: return;
495: }
496:
497: // secods|expires date
1.127.2.22.2. 4(paf 498:3): Cache_data* data=static_cast<Cache_data*>(r.classes_conf.get(cache_data_name));
1.79 paf 499: if(!data)
500: throw Exception("parser.runtime",
1.127.2.22.2. 4(paf 501:3): 0,
1.79 paf 502: "expire-time reducing instruction without cache");
503:
1.127.2.22.2. 4(paf 504:3): time_t expires=as_expires(r, params, 0, now);
1.79 paf 505: if(expires < data->expires)
506: data->expires=expires;
507:
508: return;
509: }
1.63 paf 510:
511: // file_spec, expires, body code
1.127.2.22.2. 7(paf 512:3): const String& file_spec=r.absolute(params.as_string(0, "filespec must be string"));
1.65 paf 513:
1.127.2.22.2. 4(paf 514:3): Cache_data* data=new Cache_data;
5(paf 515:3): Temp_hash_value<const StringBody, PA_Object*>
1.127.2.10 paf 516: cache_data_setter(r.classes_conf, cache_data_name, data);
1.127.2.22.2. 4(paf 517:3): data->expires=as_expires(r, params, 1, now);
7(paf 518:3): Value& body_code=params.as_junction(2, "body must be code");
1.63 paf 519:
1.127.2.10 paf 520: if(data->expires>now) { // valid 'expires' specified? try cached copy...
1.69 paf 521: // hence we don't hope to have unary create/lockEX
522: // we need some plan to live in a life like that, so...
523: // worst races plan:
524: // A B
525: // open
526: // |open
527: // lockSH
528: // |nonblocking-lockEX fails
529: // unlockSH
530: // close, cache_get returns 0
531: // open
532: // nonblocking-lockEX succeeds; process, write, close
533: // |retry1: open
534: // ...
535: // |lockSH succeeds; ...
536:
537: for(int retry=0; retry<2; retry++) {
1.127.2.22.2. 2(paf 538:3): if(const String* cached_body=cache_get(r.charsets, file_spec, now)) { // have cached copy?
1.79 paf 539: // write it out
540: r.write_assign_lang(*cached_body);
541: // happy with it
542: return;
543: }
1.69 paf 544:
545: // non-blocked lock; process; cache it
1.127.2.22.2. 4(paf 546:3): if(const String* processed_body=
1.127.2.10 paf 547: locked_process_and_cache_put(r, body_code, *data, file_spec)) {
1.63 paf 548: // write it out
1.69 paf 549: r.write_assign_lang(*processed_body);
1.63 paf 550: // happy with it
551: return;
1.69 paf 552: } else { // somebody writing result right now
553: pa_sleep(0, 500000); // waiting half a second
554: retry=0; // prolonging our wait, than could cache_get it, without processing body_code
1.63 paf 555: }
1.69 paf 556: }
1.78 paf 557: throw Exception(0,
1.127.2.22.2. 4(paf 558:3): &file_spec,
1.69 paf 559: "locking problem");
560: } else {
1.79 paf 561: // instructed not to cache; forget cached copy
1.68 paf 562: cache_delete(file_spec);
1.69 paf 563: // process
1.127.2.22.2. (paf 564:): const String& processed_body=r.process_to_string(body_code);
1.69 paf 565: // write it out
1.127.2.22.2. 4(paf 566:3): r.write_assign_lang(processed_body);
1.69 paf 567: // happy with it
568: return;
569: }
570: // never reached
1.63 paf 571: }
572:
1.74 paf 573:
1.127.2.22.2. 5(paf 574:3):
575:3): // also used in pa_request.C to pass param to @unhandled_exception
1.74 paf 576:
1.127.2.22.2. 7(paf 577:3): static void _try_operator(Request& r, MethodParams& params) {
578:3): Value& body_code=params.as_junction(0, "body_code must be code");
579:3): Value& catch_code=params.as_junction(1, "catch_code must be code");
1.74 paf 580:
1.86 paf 581: StringOrValue result;
1.123 paf 582: // taking snapshot of try-context
583: Request_context_saver try_context(r);
1.74 paf 584: try {
1.86 paf 585: result=r.process(body_code);
1.74 paf 586: } catch(const Exception& e) {
1.127.2.22.2. 0(paf 587:3): Request::Exception_details details=r.get_details(e);
588:3):
1.123 paf 589: Request_context_saver throw_context(r); // taking snapshot of throw-context [stack trace contains error]
590: try_context.restore(); // restoring try-context to perform catch-code
1.74 paf 591:
1.127.2.22.2. 4(paf 592:3): Junction* junction=catch_code.get_junction();
1.127.2.10 paf 593: Value* method_frame=junction->method_frame;
1.127.2.22.2. (paf 594:): Value* saved_exception_var_value=method_frame->get_element(exception_var_name, *method_frame, false);
5(paf 595:3): junction->method_frame->put_element(exception_var_name, &details.vhash, false);
1.86 paf 596: result=r.process(catch_code);
1.74 paf 597: bool handled=false;
1.127.2.22.2. (paf 598:): if(Value* value=
5(paf 599:3): details.vhash.hash().get(exception_handled_part_name))
1.74 paf 600: handled=value->as_bool();
1.127.2.10 paf 601: junction->method_frame->put_element(exception_var_name, saved_exception_var_value, false);
1.74 paf 602:
1.123 paf 603: if(!handled) {
604: throw_context.restore(); // restoring throw-context [exception were not handled]
1.127.2.22.2. 4(paf 605:3): rethrow;
606:3): }
1.74 paf 607: }
1.123 paf 608: // write out result
1.86 paf 609: r.write_pass_lang(result);
1.74 paf 610: }
611:
1.127.2.22.2. 7(paf 612:3): static void _throw_operator(Request& r, MethodParams& params) {
613:3): if(params.count()==1) {
8(paf 614:3): if(HashStringValue *hash=params[0].get_hash()) {
1.127.2.5 paf 615: const char* type=0;
1.127.2.22.2. (paf 616:): if(Value* value=hash->get(exception_type_part_name))
617:): type=value->as_string().cstr();
4(paf 618:3): const String* source=0;
(paf 619:): if(Value* value=hash->get(exception_source_part_name))
4(paf 620:3): source=&value->as_string();
(paf 621:): const char* comment;
622:): if(Value* value=hash->get(exception_comment_part_name))
623:): comment=value->as_string().cstr();
1.74 paf 624:
1.78 paf 625: throw Exception(type,
1.127.2.22.2. 4(paf 626:3): source?source:0,
627:3): "%s", comment?comment:"");
1.74 paf 628: } else
1.78 paf 629: throw Exception("parser.runtime",
1.127.2.22.2. 4(paf 630:3): 0,
1.74 paf 631: "one-param version has hash param");
632: } else {
1.127.2.22.2. 7(paf 633:3): const char* type=params.as_string(0, "type must be string").cstr();
634:3): const String& source=params.as_string(1, "source must be string");
635:3): const char* comment=params.count()>2? params.as_string(2, "comment must be string").cstr()
1(paf 636:3): :0;
4(paf 637:3): throw Exception(type, &source, "%s", comment?comment:"");
1.74 paf 638: }
639: }
1.127.2.20 paf 640:
641: #if defined(WIN32) && defined(_DEBUG)
642: # define PA_BPT
1.127.2.22.2. 7(paf 643:3): static void _bpt(Request& r, MethodParams& params) {
1.127.2.20 paf 644: _asm int 3;
645: }
646: #endif
647:
1.10 paf 648: // constructor
649:
1.127.2.10 paf 650: VClassMAIN::VClassMAIN(): VClass() {
1.127.2.22.2. 4(paf 651:3): set_name(*new String(MAIN_CLASS_NAME));
1.127.2.20 paf 652:
653: #ifdef PA_BPT
654: // ^bpt[]
655: add_native_method("bpt", Method::CT_ANY, _bpt, 0, 0);
656: #endif
1.121 paf 657:
1.1 paf 658: // ^if(condition){code-when-true}
659: // ^if(condition){code-when-true}{code-when-false}
1.10 paf 660: add_native_method("if", Method::CT_ANY, _if, 2, 3);
1.1 paf 661:
662: // ^untaint[as-is|uri|sql|js|html|html-typo]{code}
1.59 paf 663: add_native_method("untaint", Method::CT_ANY, _untaint, 1, 2);
1.1 paf 664:
665: // ^taint[as-is|uri|sql|js|html|html-typo]{code}
1.10 paf 666: add_native_method("taint", Method::CT_ANY, _taint, 1, 2);
1.1 paf 667:
668: // ^process[code]
1.116 paf 669: add_native_method("process", Method::CT_ANY, _process, 1, 2);
1.1 paf 670:
671: // ^rem{code}
1.51 parser 672: add_native_method("rem", Method::CT_ANY, _rem, 1, 10000);
1.1 paf 673:
674: // ^while(condition){code}
1.10 paf 675: add_native_method("while", Method::CT_ANY, _while, 2, 2);
1.1 paf 676:
677: // ^use[file]
1.10 paf 678: add_native_method("use", Method::CT_ANY, _use, 1, 1);
1.1 paf 679:
1.54 paf 680: // ^for[i](from-number;to-number-inclusive){code}[delim]
1.10 paf 681: add_native_method("for", Method::CT_ANY, _for, 3+1, 3+1+1);
1.1 paf 682:
683: // ^eval(expr)
684: // ^eval(expr)[format]
1.10 paf 685: add_native_method("eval", Method::CT_ANY, _eval, 1, 2);
1.52 parser 686:
1.1 paf 687: // ^connect[protocol://user:pass@host[:port]/database]{code with ^sql-s}
1.10 paf 688: add_native_method("connect", Method::CT_ANY, _connect, 2, 2);
689:
1.63 paf 690:
1.65 paf 691: // ^cache[file_spec] delete cache
1.63 paf 692: // ^cache[file_spec](time){code} time=0 no cache
1.65 paf 693: add_native_method("cache", Method::CT_ANY, _cache, 1, 3);
1.63 paf 694:
1.28 parser 695: // switch
696:
697: // ^switch[value]{cases}
698: add_native_method("switch", Method::CT_ANY, _switch, 2, 2);
699:
700: // ^case[value]{code}
1.51 parser 701: add_native_method("case", Method::CT_ANY, _case, 2, 10000);
1.74 paf 702:
703: // try-catch
704:
705: // ^try{code}{catch code}
706: add_native_method("try", Method::CT_ANY, _try_operator, 2, 2);
707: // ^throw[$exception hash]
708: // ^throw[type;source;comment]
709: add_native_method("throw", Method::CT_ANY, _throw_operator, 1, 3);
710:
1.10 paf 711: }
1.11 paf 712:
713: // constructor & configurator
1.1 paf 714:
1.127.2.22.2. 4(paf 715:3): VStateless_class& VClassMAIN_create() {
716:3): return *new VClassMAIN;
1.1 paf 717: }
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