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| version 1.8, 2001/04/17 19:00:27 | version 1.153, 2005/07/15 06:16:41 |
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| Line 1 | Line 1 |
| /** @file | /** @file |
| Parser: @b ROOT parser class. | Parser: parser @b operators. |
| Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com) | Copyright (c) 2001-2004 ArtLebedev Group (http://www.artlebedev.com) |
| Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru) | |
| */ | |
| Author: Alexander Petrosyan <paf@design.ru> (http://design.ru/paf) | static const char * const IDENT_OP_C="$Date$"; |
| $Id$ | #include "classes.h" |
| */ | #include "pa_vmethod_frame.h" |
| #include "pa_config_includes.h" | |
| #include "pa_common.h" | #include "pa_common.h" |
| #include "pa_os.h" | |
| #include "pa_request.h" | #include "pa_request.h" |
| #include "_op.h" | |
| #include "pa_vint.h" | #include "pa_vint.h" |
| #include "pa_sql_connection.h" | #include "pa_sql_connection.h" |
| #include "pa_vdate.h" | |
| #include "pa_vmethod_frame.h" | |
| #include "pa_vclass.h" | |
| #include "pa_charset.h" | |
| // limits | |
| #define MAX_LOOPS 10000 | |
| // defines | |
| #define CASE_DEFAULT_VALUE "DEFAULT" | |
| #define PROCESS_MAIN_OPTION_NAME "main" | |
| #define PROCESS_FILE_OPTION_NAME "file" | |
| #define PROCESS_LINENO_OPTION_NAME "lineno" | |
| // class | |
| class VClassMAIN: public VClass { | |
| public: | |
| VClassMAIN(); | |
| }; | |
| // defines for statics | |
| #define SWITCH_DATA_NAME "SWITCH-DATA" | |
| #define CACHE_DATA_NAME "CACHE-DATA" | |
| #define EXCEPTION_VAR_NAME "exception" | |
| // statics | |
| //^switch ^case | |
| static const String switch_data_name(SWITCH_DATA_NAME); | |
| //^cache | |
| static const String cache_data_name(CACHE_DATA_NAME); | |
| static const String exception_var_name(EXCEPTION_VAR_NAME); | |
| // local defines | |
| #define CACHE_EXCEPTION_HANDLED_CACHE_NAME "cache" | |
| // helpers | |
| class Untaint_lang_name2enum: public Hash<const String::Body, String::Language> { | |
| public: | |
| Untaint_lang_name2enum() { | |
| #define ULN(name, LANG) \ | |
| put(String::Body(name), (value_type)(String::L_##LANG)); | |
| ULN("as-is", AS_IS); | |
| ULN("optimized-as-is", AS_IS|String::L_OPTIMIZE_BIT); | |
| ULN("file-spec", FILE_SPEC); | |
| ULN("http-header", HTTP_HEADER); | |
| ULN("mail-header", MAIL_HEADER); | |
| ULN("uri", URI); | |
| ULN("sql", SQL); | |
| ULN("js", JS); | |
| ULN("xml", XML); | |
| ULN("optimized-xml", XML|String::L_OPTIMIZE_BIT); | |
| ULN("html", HTML); | |
| ULN("optimized-html", HTML|String::L_OPTIMIZE_BIT); | |
| #undef ULN | |
| } | |
| } untaint_lang_name2enum; | |
| static void _if(Request& r, const String&, MethodParams *params) { | // methods |
| Value& condition_code=params->get(0); | |
| bool condition=r.process(condition_code, | static void _if(Request& r, MethodParams& params) { |
| 0/*no name*/, | Value& condition_code=params.as_junction(0, "condition must be expression"); |
| bool condition=r.process_to_value(condition_code, | |
| false/*don't intercept string*/).as_bool(); | false/*don't intercept string*/).as_bool(); |
| if(condition) | if(condition) |
| r.write_pass_lang(r.process(params->get(1))); | r.write_pass_lang(r.process(params.as_junction(1, "'then' parameter must be code"))); |
| else if(params->size()==3) | else if(params.count()>2) |
| r.write_pass_lang(r.process(params->get(2))); | r.write_pass_lang(r.process(params.as_junction(2, "'else' parameter must be code"))); |
| } | } |
| static void _untaint(Request& r, const String& method_name, MethodParams *params) { | static void _untaint(Request& r, MethodParams& params) { |
| Pool& pool=r.pool(); | |
| String::Language lang; | |
| const String& lang_name=r.process(params->get(0)).as_string(); | if(params.count()==1) |
| String::Untaint_lang lang=static_cast<String::Untaint_lang>( | lang=String::L_AS_IS; // mark as simply 'tainted'. useful in html from sql |
| untaint_lang_name2enum->get_int(lang_name)); | else { |
| if(!lang) | const String& lang_name=params.as_string(0, "lang must be string"); |
| PTHROW(0, 0, | lang=untaint_lang_name2enum.get(lang_name); |
| &lang_name, | if(!lang) |
| "invalid untaint language"); | throw Exception(0, |
| &lang_name, | |
| "invalid taint language"); | |
| } | |
| { | { |
| Value& vbody=params->get_junction(1, "body must be code"); | Value& vbody=params.as_junction(params.count()-1, "body must be code"); |
| Temp_lang temp_lang(r, lang); // set temporarily specified ^untaint[language; | Temp_lang temp_lang(r, lang); // set temporarily specified ^untaint[language; |
| r.write_pass_lang(r.process(vbody)); // process marking tainted with that lang | r.write_pass_lang(r.process(vbody)); // process marking tainted with that lang |
| } | } |
| } | } |
| static void _taint(Request& r, const String&, MethodParams *params) { | static void _taint(Request& r, MethodParams& params) { |
| Pool& pool=r.pool(); | String::Language lang; |
| if(params.count()==1) | |
| String::Untaint_lang lang; | lang=String::L_TAINTED; // mark as simply 'tainted'. useful in table:set |
| if(params->size()==1) | |
| lang=String::UL_TAINTED; // mark as simply 'tainted'. useful in table:set | |
| else { | else { |
| const String& lang_name= | const String& lang_name=params.as_string(0, "lang must be string"); |
| r.process(params->get(0)).as_string(); | lang=untaint_lang_name2enum.get(lang_name); |
| lang=static_cast<String::Untaint_lang>( | |
| untaint_lang_name2enum->get_int(lang_name)); | |
| if(!lang) | if(!lang) |
| PTHROW(0, 0, | throw Exception(0, |
| &lang_name, | &lang_name, |
| "invalid taint language"); | "invalid taint language"); |
| } | } |
| { | { |
| Value& vbody=params->get_no_junction(params->size()-1, "body must not be code"); | Value& vbody=params.as_no_junction(params.count()-1, "body must not be code"); |
| String result(r.pool()); | String result; |
| result.append( | result.append( |
| vbody.as_string(), // process marking tainted with that lang | vbody.as_string(), // process marking tainted with that lang |
| lang, true); // force result language to specified | lang, true); // force result language to specified |
| Line 74 static void _taint(Request& r, const Str | Line 139 static void _taint(Request& r, const Str |
| } | } |
| } | } |
| static void _process(Request& r, const String& method_name, MethodParams *params) { | static void _process(Request& r, MethodParams& params) { |
| // calculate pseudo file name of processed chars | Method* main_method; |
| // would be something like "/some/file(4) process" | |
| char place[MAX_STRING]; | size_t index=0; |
| #ifndef NO_STRING_ORIGIN | Value* target_self; |
| const Origin& origin=method_name.origin(); | Value& maybe_target_self=params[index]; |
| snprintf(place, MAX_STRING, "%s(%d) %s", | if(maybe_target_self.get_string() || maybe_target_self.get_junction()) |
| origin.file, 1+origin.line, | target_self=&r.get_method_frame()->caller()->self(); |
| method_name.cstr()); | else { |
| #else | target_self=&maybe_target_self; index++; |
| strncpy(place, MAX_STRING, method_name.cstr()); | } |
| #endif | |
| VStateless_class& self_class=*r.self->get_class(); | |
| { | { |
| VStateless_class *target_class=target_self->get_last_derived_class(); | |
| if(!target_class) | |
| throw Exception("parser.runtime", | |
| 0, | |
| "no target class"); | |
| // temporary remove language change | |
| Temp_lang temp_lang(r, String::L_PASS_APPENDED); | |
| // temporary zero @main so to maybe-replace it in processed code | // temporary zero @main so to maybe-replace it in processed code |
| Temp_method temp_method_main(self_class, *main_method_name, 0); | Temp_method temp_method_main(*target_class, main_method_name, 0); |
| // temporary zero @auto so it wouldn't be auto-called in Request::use_buf | // temporary zero @auto so it wouldn't be auto-called in Request::use_buf |
| Temp_method temp_method_auto(self_class, *auto_method_name, 0); | Temp_method temp_method_auto(*target_class, auto_method_name, 0); |
| // evaluate source to process | |
| const String& source= | |
| r.process(params->get(0)).as_string(); | |
| // process source code, append processed methods to 'self' class | size_t options_index=index+1; |
| // maybe-define new @main | HashStringValue* options=0; |
| r.use_buf(source.cstr(), place, &self_class); | if(options_index<params.count()) { |
| Value& voptions=params.as_no_junction(options_index, "options must not be code"); | |
| // maybe-execute @main[] | options=voptions.get_hash(); |
| if(const Method *method=self_class.get_method(*main_method_name)) { | if(!options) |
| // execute! | throw Exception("parser.runtime", |
| r.execute(*method->parser_code); | 0, |
| "options must be hash"); | |
| } | } |
| const String* main_alias=0; | |
| const String* file_alias=0; | |
| int line_no_alias_offset=0; | |
| if(options) { | |
| int valid_options=0; | |
| if(Value* vmain_alias=options->get(PROCESS_MAIN_OPTION_NAME)) { | |
| valid_options++; | |
| main_alias=&vmain_alias->as_string(); | |
| } | |
| if(Value* vfile_alias=options->get(PROCESS_FILE_OPTION_NAME)) { | |
| valid_options++; | |
| file_alias=&vfile_alias->as_string(); | |
| } | |
| if(Value* vline_no_alias_offset=options->get(PROCESS_LINENO_OPTION_NAME)) { | |
| valid_options++; | |
| line_no_alias_offset=vline_no_alias_offset->as_int(); | |
| } | |
| if(valid_options!=options->count()) | |
| throw Exception("parser.runtime", | |
| 0, | |
| "called with invalid option"); | |
| } | |
| uint processe_file_no=file_alias? | |
| r.register_file(r.absolute(*file_alias)) | |
| : pseudo_file_no__process; | |
| // process...{string} | |
| Value& vjunction=params.as_junction(index, "body must be code"); | |
| // evaluate source to process | |
| const String& source=r.process_to_string(vjunction); | |
| r.use_buf(*target_class, | |
| source.cstr(String::L_UNSPECIFIED, r.connection(false)), | |
| main_alias, | |
| processe_file_no, | |
| line_no_alias_offset); | |
| // main_method | |
| main_method=target_class->get_method(main_method_name); | |
| } | |
| // after restoring current-request-lang | |
| // maybe-execute @main[] | |
| if(main_method) { | |
| // temporarily set method_frame's self to target_self | |
| Temp_method_frame_self tmfs(*r.get_method_frame(), *target_self); | |
| // execute! | |
| r.execute(*main_method->parser_code); | |
| } | } |
| } | } |
| static void _rem(Request& r, const String&, MethodParams *params) { | static void _rem(Request&, MethodParams& params) { |
| params->get_junction(0, "body must be code"); | params.as_junction(0, "body must be code"); |
| } | } |
| static void _while(Request& r, const String& method_name, MethodParams *params) { | static void _while(Request& r, MethodParams& params) { |
| Pool& pool=r.pool(); | Value& vcondition=params.as_junction(0, "condition must be expression"); |
| Value& body=params.as_junction(1, "body must be code"); | |
| Value& vcondition=params->get_junction(0, "condition must be expression"); | |
| Value& body=params->get_junction(1, "body must be code"); | |
| // while... | // while... |
| int endless_loop_count=0; | int endless_loop_count=0; |
| while(true) { | while(true) { |
| if(++endless_loop_count>=1973) // endless loop? | if(++endless_loop_count>=MAX_LOOPS) // endless loop? |
| PTHROW(0, 0, | throw Exception("parser.runtime", |
| &method_name, | 0, |
| "endless loop detected"); | "endless loop detected"); |
| bool condition= | bool condition=r.process_to_value(vcondition, |
| r.process( | |
| vcondition, | |
| 0/*no name*/, | |
| false/*don't intercept string*/).as_bool(); | false/*don't intercept string*/).as_bool(); |
| if(!condition) // ...condition is true | if(!condition) // ...condition is true |
| break; | break; |
| Line 141 static void _while(Request& r, const Str | Line 252 static void _while(Request& r, const Str |
| } | } |
| } | } |
| static void _use(Request& r, const String& method_name, MethodParams *params) { | static void _use(Request& r, MethodParams& params) { |
| Value& vfile=params->get_no_junction(0, "file name must not be code"); | Value& vfile=params.as_no_junction(0, "file name must not be code"); |
| r.use_file(r.absolute(vfile.as_string())); | r.use_file(r.main_class, vfile.as_string()); |
| } | } |
| /// ^for[i;from-number;to-number-inclusive]{code}[delim] | static void _for(Request& r, MethodParams& params) { |
| static void _for(Request& r, const String& method_name, MethodParams *params) { | const String& var_name=params.as_string(0, "var name must be string"); |
| Pool& pool=r.pool(); | int from=params.as_int(1, "from must be int", r); |
| const String& var_name=r.process(params->get(0)).as_string(); | int to=params.as_int(2, "to must be int", r); |
| int from=(int)r.process(params->get(1)).as_double(); | Value& body_code=params.as_junction(3, "body must be code"); |
| int to=(int)r.process(params->get(2)).as_double(); | Value* delim_maybe_code=params.count()>4?¶ms[4]:0; |
| Value& body_code=params->get_junction(3, "body must be code"); | |
| Value *delim_code=params->size()==3+1+1?¶ms->get(3+1):0; | if(to-from>=MAX_LOOPS) // too long loop? |
| throw Exception("parser.runtime", | |
| 0, | |
| "endless loop detected"); | |
| bool need_delim=false; | bool need_delim=false; |
| VInt *vint=new(pool) VInt(pool, 0); | VInt* vint=new VInt(0); |
| int endless_loop_count=0; | r.get_method_frame()->caller()->put_element(var_name, vint, false); |
| for(int i=from; i<=to; i++) { | for(int i=from; i<=to; i++) { |
| if(++endless_loop_count>=2001) // endless loop? | |
| PTHROW(0, 0, | |
| &method_name, | |
| "endless loop detected"); | |
| vint->set_int(i); | vint->set_int(i); |
| r.root->put_element(var_name, vint); | |
| Value& processed_body=r.process(body_code); | StringOrValue sv_processed=r.process(body_code); |
| if(delim_code) { // delimiter set? | const String* s_processed=sv_processed.get_string(); |
| const String *string=processed_body.get_string(); | if(delim_maybe_code && s_processed && s_processed->length()) { // delimiter set and we have body |
| if(need_delim && string && string->size()) // need delim & iteration produced string? | if(need_delim) // need delim & iteration produced string? |
| r.write_pass_lang(r.process(*delim_code)); | r.write_pass_lang(r.process(*delim_maybe_code)); |
| need_delim=true; | need_delim=true; |
| } | } |
| r.write_pass_lang(processed_body); | r.write_pass_lang(sv_processed); |
| } | } |
| } | } |
| static void _eval(Request& r, const String&, MethodParams *params) { | static void _eval(Request& r, MethodParams& params) { |
| Value& expr=params->get_junction(0, "need expression"); | Value& expr=params.as_junction(0, "need expression"); |
| // evaluate expresion | // evaluate expresion |
| Value *result=r.process(expr, | Value& value_result=r.process_to_value(expr, |
| 0/*no name*/, | |
| true/*don't intercept string*/).as_expr_result(); | true/*don't intercept string*/).as_expr_result(); |
| if(params->size()==2) { | if(params.count()>1) { |
| Value& fmt=params->get_no_junction(1, "fmt must not be code"); | Value& fmt=params.as_no_junction(1, "fmt must not be code"); |
| r.write_no_lang(String(format(value_result.as_double(), fmt.as_string().cstrm()))); | |
| } else | |
| r.write_no_lang(value_result); | |
| } | |
| static void _connect(Request& r, MethodParams& params) { | |
| #ifdef RESOURCES_DEBUG | |
| struct timeval mt[2]; | |
| #endif | |
| Value& url=params.as_no_junction(0, "url must not be code"); | |
| Value& body_code=params.as_junction(1, "body must be code"); | |
| Table* protocol2driver_and_client=0; | |
| if(Value* sql=r.main_class.get_element(String(MAIN_SQL_NAME), r.main_class, false)) { | |
| if(Value* element=sql->get_element(String(MAIN_SQL_DRIVERS_NAME), *sql, false)) { | |
| protocol2driver_and_client=element->get_table(); | |
| } | |
| } | |
| Pool& pool=r.pool(); | #ifdef RESOURCES_DEBUG |
| String& string=*new(pool) String(pool); | //measure:before |
| string.APPEND_CONST(format(pool, result->as_double(), fmt.as_string().cstr())); | gettimeofday(&mt[0],NULL); |
| result=new(pool) VString(string); | #endif |
| // connect | |
| SQL_Connection* connection=SQL_driver_manager->get_connection(url.as_string(), | |
| protocol2driver_and_client, | |
| r.charsets.source().NAME().cstr()); | |
| #ifdef RESOURCES_DEBUG | |
| //measure:after connect | |
| gettimeofday(&mt[1],NULL); | |
| double t[2]; | |
| for(int i=0;i<2;i++) | |
| t[i]=mt[i].tv_sec+mt[i].tv_usec/1000000.0; | |
| r.sql_connect_time+=t[1]-t[0]; | |
| #endif | |
| Temp_connection temp_connection(r, connection); | |
| // execute body | |
| try { | |
| r.write_assign_lang(r.process(body_code)); | |
| connection->commit(); | |
| connection->close(); | |
| } catch(...) { // process problem | |
| connection->rollback(); | |
| connection->close(); | |
| rethrow; | |
| } | } |
| r.write_no_lang(*result); | |
| } | } |
| #ifndef DOXYGEN | |
| class Switch_data: public PA_Object { | |
| public: | |
| Request& r; | |
| Value& searching; | |
| Value* found; | |
| Value* _default; | |
| public: | |
| Switch_data(Request& ar, Value& asearching): | |
| r(ar), searching(asearching) {} | |
| }; | |
| #endif | |
| static void _switch(Request& r, MethodParams& params) { | |
| Switch_data* data=new Switch_data(r, r.process_to_value(params[0])); | |
| Temp_hash_value<const String::Body, void*> | |
| switch_data_setter(r.classes_conf, switch_data_name, data); | |
| Value& cases_code=params.as_junction(1, "switch cases must be code"); | |
| // execution of found ^case[...]{code} must be in context of ^switch[...]{code} | |
| // because of stacked WWrapper used there as wcontext | |
| r.process(cases_code, true/*intercept_string*/); | |
| if(Value* selected_code=data->found? data->found: data->_default) | |
| r.write_pass_lang(r.process(*selected_code)); | |
| } | |
| static void _case(Request& r, MethodParams& params) { | |
| Switch_data* data=static_cast<Switch_data*>(r.classes_conf.get(switch_data_name)); | |
| if(!data) | |
| throw Exception("parser.runtime", | |
| 0, | |
| "without switch"); | |
| typedef double (*math_one_double_op_func_ptr)(double); | int count=params.count(); |
| static double round(double op) { return floor(op+0.5); } | Value& code=params.as_junction(--count, "case result must be code"); |
| static double sign(double op) { return op > 0 ? 1 : ( op < 0 ? -1 : 0 ); } | |
| for(int i=0; i<count; i++) { | |
| Value& value=r.process_to_value(params[i]); | |
| static void double_one_op( | if(value.as_string() == CASE_DEFAULT_VALUE) { |
| Request& r, | data->_default=&code; |
| const String& method_name, MethodParams *params, | break; |
| math_one_double_op_func_ptr func) { | } |
| Pool& pool=r.pool(); | |
| Value& param=params->get_junction(0, "parameter must be expression"); | |
| Value& result=*new(pool) VDouble(pool, (*func)(r.process(param).as_double())); | bool matches; |
| r.write_no_lang(result); | if(data->searching.is_string()) |
| } | matches=data->searching.as_string() == value.as_string(); |
| else | |
| matches=data->searching.as_double() == value.as_double(); | |
| if(matches) { | |
| if(data->found) | |
| throw Exception("parser.runtime", | |
| 0, | |
| "duplicate found"); | |
| static void _round(Request& r, const String& method_name, MethodParams *params) { | data->found=&code; |
| double_one_op(r, method_name, params, &round); | break; |
| } | |
| } | |
| } | } |
| #ifndef DOXYGEN | |
| struct Try_catch_result { | |
| StringOrValue processed_code; | |
| const String* exception_should_be_handled; | |
| Try_catch_result(): exception_should_be_handled(0) {} | |
| }; | |
| #endif | |
| /// used by ^try and ^cache, @returns $exception.handled[string] if any | |
| template<class I> | |
| static Try_catch_result try_catch(Request& r, | |
| StringOrValue body_code(Request&, I), I info, | |
| Value* catch_code) | |
| { | |
| Try_catch_result result; | |
| if(!catch_code) { | |
| result.processed_code=body_code(r, info); | |
| return result; | |
| } | |
| // taking snapshot of try-context | |
| Request_context_saver try_context(r); | |
| try { | |
| result.processed_code=body_code(r, info); | |
| } catch(const Exception& e) { | |
| Request_context_saver throw_context(r); // taking snapshot of throw-context [stack trace contains error] | |
| Request::Exception_details details=r.get_details(e); | |
| try_context.restore(); // restoring try-context to perform catch-code | |
| Junction* junction=catch_code->get_junction(); | |
| Value* method_frame=junction->method_frame; | |
| Value* saved_exception_var_value=method_frame->get_element(exception_var_name, *method_frame, false); | |
| junction->method_frame->put_element(exception_var_name, &details.vhash, false); | |
| result.processed_code=r.process(*catch_code); | |
| // retriving $exception.handled, restoring $exception var | |
| Value* vhandled=details.vhash.hash().get(exception_handled_part_name); | |
| junction->method_frame->put_element(exception_var_name, saved_exception_var_value, false); | |
| bool bhandled=false; | |
| if(vhandled) { | |
| if(vhandled->is_string()) { // not simple $exception.handled(1/0)? | |
| result.exception_should_be_handled=vhandled->get_string(); // considering 'recovered' and let the caller recover | |
| return result; | |
| } | |
| static void _floor(Request& r, const String& method_name, MethodParams *params) { | bhandled=vhandled->as_bool(); |
| double_one_op(r, method_name, params, &floor); | } |
| if(!bhandled) { | |
| throw_context.restore(); // restoring throw-context [exception were not handled] | |
| rethrow; | |
| } | |
| } | |
| return result; | |
| } | } |
| static void _ceiling(Request& r, const String& method_name, MethodParams *params) { | // cache-- |
| double_one_op(r, method_name, params, &ceil); | |
| // consts | |
| const int DATA_STRING_SERIALIZED_VERSION=0x0006; | |
| // helper types | |
| #ifndef DOXYGEN | |
| struct Data_string_serialized_prolog { | |
| int version; | |
| time_t expires; | |
| }; | |
| #endif | |
| void cache_delete(const String& file_spec) { | |
| file_delete(file_spec, false/*fail_on_read_problem*/); | |
| } | } |
| static void _abs(Request& r, const String& method_name, MethodParams *params) { | #ifndef DOXYGEN |
| double_one_op(r, method_name, params, &fabs); | struct Cache_scope { |
| public: | |
| time_t expires; | |
| const String* body_from_disk; | |
| }; | |
| struct Locked_process_and_cache_put_action_info { | |
| Request *r; | |
| Cache_scope *scope; | |
| Value* body_code; Value* catch_code; | |
| const String* processed_code; | |
| }; | |
| #endif | |
| static StringOrValue process_cache_body_code(Request& r, Value* body_code) { | |
| return StringOrValue(r.process_to_string(*body_code)); | |
| } | } |
| static void _sign(Request& r, const String& method_name, MethodParams *params) { | /* @todo maybe network order worth spending some effort? |
| double_one_op(r, method_name, params, &sign); | don't bothering myself with network byte order, |
| am not planning to be able to move resulting file across platforms | |
| */ | |
| static void locked_process_and_cache_put_action(int f, void *context) { | |
| Locked_process_and_cache_put_action_info& info= | |
| *static_cast<Locked_process_and_cache_put_action_info *>(context); | |
| // body->process | |
| Try_catch_result result=try_catch(*info.r, | |
| process_cache_body_code, info.body_code, | |
| info.catch_code); | |
| if(result.exception_should_be_handled) { | |
| if(*result.exception_should_be_handled==CACHE_EXCEPTION_HANDLED_CACHE_NAME) { | |
| if(const String* body_from_disk=info.scope->body_from_disk) // we have something old? | |
| info.processed_code=body_from_disk; | |
| else | |
| throw Exception(0, | |
| new String("$"EXCEPTION_VAR_NAME"."EXCEPTION_HANDLED_PART_NAME"["CACHE_EXCEPTION_HANDLED_CACHE_NAME"]"), | |
| "fallback failed - there is no old cached body"); | |
| } else | |
| throw Exception("parser.runtime", | |
| result.exception_should_be_handled, | |
| "$"EXCEPTION_VAR_NAME"."EXCEPTION_HANDLED_PART_NAME" value must be " | |
| "either boolean or string '"CACHE_EXCEPTION_HANDLED_CACHE_NAME"'"); | |
| } else | |
| info.processed_code=&result.processed_code.as_string(); | |
| // expiration time not spoiled by ^cache(0) or something? | |
| if(info.scope->expires > time(0)) { | |
| // string -serialize> buffer | |
| String::Cm serialized=info.processed_code->serialize( | |
| sizeof(Data_string_serialized_prolog)); | |
| Data_string_serialized_prolog& prolog= | |
| *reinterpret_cast<Data_string_serialized_prolog *>(serialized.str); | |
| prolog.version=DATA_STRING_SERIALIZED_VERSION; | |
| prolog.expires=info.scope->expires; | |
| // buffer -write> file | |
| write(f, serialized.str, serialized.length); | |
| } else // expired! | |
| info.scope->expires=0; // flag it so that could be easily checked by caller | |
| } | |
| const String* locked_process_and_cache_put(Request& r, | |
| Value& body_code, | |
| Value* catch_code, | |
| Cache_scope& scope, | |
| const String& file_spec) | |
| { | |
| Locked_process_and_cache_put_action_info info={&r, &scope, &body_code, catch_code, 0}; | |
| const String* result=file_write_action_under_lock( | |
| file_spec, | |
| "cache_put", locked_process_and_cache_put_action, &info, | |
| false/*as_text*/, | |
| false/*do_append*/, | |
| false/*block*/, | |
| false/*fail on lock problem*/) ? info.processed_code: 0; | |
| time_t now=time(0); | |
| if(scope.expires<=now) | |
| cache_delete(file_spec); | |
| return result; | |
| } | |
| #ifndef DOXYGEN | |
| struct Cache_get_result { | |
| const String* body; | |
| bool expired; | |
| }; | |
| #endif | |
| static Cache_get_result cache_get(Request_charsets& charsets, const String& file_spec, time_t now) { | |
| Cache_get_result result={0, false}; | |
| File_read_result file=file_read(charsets, file_spec, | |
| false/*as_text*/, | |
| 0, //no params | |
| false/*fail_on_read_problem*/); | |
| if(file.success && file.length/* ignore reads which are empty due to | |
| non-unary open+lockEX conflict with lockSH */) { | |
| Data_string_serialized_prolog& prolog= | |
| *reinterpret_cast<Data_string_serialized_prolog *>(file.str); | |
| String* body=new String; | |
| if( | |
| file.length>=sizeof(Data_string_serialized_prolog) | |
| && prolog.version==DATA_STRING_SERIALIZED_VERSION) { | |
| if(body->deserialize(sizeof(Data_string_serialized_prolog), file.str, file.length)) { | |
| result.body=body; | |
| result.expired=prolog.expires <= now; | |
| } | |
| } | |
| } | |
| return result; | |
| } | |
| static time_t as_expires(Request& r, MethodParams& params, | |
| int index, time_t now) { | |
| time_t result; | |
| if(Value* vdate=params[index].as(VDATE_TYPE, false)) | |
| result=static_cast<VDate*>(vdate)->get_time(); | |
| else | |
| result=now+(time_t)params.as_double(index, "lifespan must be date or number", r); | |
| return result; | |
| } | } |
| static const String& as_file_spec(Request& r, MethodParams& params, int index) { | |
| return r.absolute(params.as_string(index, "filespec must be string")); | |
| } | |
| static void _cache(Request& r, MethodParams& params) { | |
| time_t now=time(0); | |
| /// ^connect[protocol://user:pass@host[:port]/database]{code with ^sql-s} | // ^cache[filename] ^cache(seconds) ^cache[expires date] |
| static void _connect(Request& r, const String&, MethodParams *params) { | if(params.count()==1) { |
| Pool& pool=r.pool(); | if(params[0].is_string()) { // filename? |
| cache_delete(as_file_spec(r, params, 0)); | |
| return; | |
| } | |
| Value& url=params->get_no_junction(0, "url must not be code"); | // secods|expires date |
| Value& body_code=params->get_junction(1, "body must be code"); | Cache_scope* scope=static_cast<Cache_scope*>(r.classes_conf.get(cache_data_name)); |
| if(!scope) | |
| throw Exception("parser.runtime", | |
| 0, | |
| "expire-time reducing instruction without cache"); | |
| time_t expires=as_expires(r, params, 0, now); | |
| if(expires < scope->expires) | |
| scope->expires=expires; | |
| return; | |
| } else if(params.count()<3) | |
| throw Exception("parser.runtime", | |
| 0, | |
| "invalid number of parameters"); | |
| // file_spec, expires, body code | |
| const String& file_spec=r.absolute(params.as_string(0, "filespec must be string")); | |
| // connect | Cache_scope scope={as_expires(r, params, 1, now), 0}; |
| SQL_Connection& connection=SQL_driver_manager->get_connection( | |
| url.as_string(), r.protocol2library); | |
| Exception rethrow_me; | Temp_hash_value<const String::Body, void*> |
| // remember/set current connection | cache_scope_setter(r.classes_conf, cache_data_name, &scope); |
| SQL_Connection *saved_connection=r.connection; | Value& body_code=params.as_junction(2, "body_code must be code"); |
| r.connection=&connection; | Value* catch_code=0; |
| // execute body | if(params.count()>3) |
| bool body_failed=false; | catch_code=¶ms.as_junction(3, "catch_code must be code"); |
| PTRY | |
| r.write_assign_lang(r.process(body_code)); | if(scope.expires>now) { // valid 'expires' specified? try cached copy... |
| PCATCH(e) { // connect/process problem | // hence we don't hope to have unary create/lockEX |
| rethrow_me=e; body_failed=true; | // we need some plan to live in a life like that, so... |
| // worst races plan: | |
| // A B | |
| // open | |
| // |open | |
| // lockSH | |
| // |nonblocking-lockEX fails | |
| // unlockSH | |
| // close, cache_get returns 0 | |
| // open | |
| // nonblocking-lockEX succeeds; process, write, close | |
| // |retry1: open | |
| // ... | |
| // |lockSH succeeds; ... | |
| for(int retry=0; retry<2; retry++) { | |
| Cache_get_result cached=cache_get(r.charsets, file_spec, now); | |
| if(cached.body) { // have cached copy | |
| if(cached.expired) | |
| scope.body_from_disk=cached.body; // storing for user to retrive it with ^cache[] | |
| else // and it's not expired yet | |
| { | |
| // write it out | |
| r.write_assign_lang(*cached.body); | |
| // happy with it | |
| return; | |
| } | |
| } | |
| // non-blocked lock; process; cache it | |
| if(const String* processed_body= | |
| locked_process_and_cache_put(r, body_code, catch_code, scope, file_spec)) { | |
| // write it out | |
| r.write_assign_lang(*processed_body); | |
| // happy with it | |
| return; | |
| } else { // somebody writing result right now | |
| pa_sleep(0, 500000); // waiting half a second | |
| retry=0; // prolonging our wait, than could cache_get it, without processing body_code | |
| } | |
| } | |
| throw Exception(0, | |
| &file_spec, | |
| "locking problem"); | |
| } else { | |
| // instructed not to cache; forget cached copy | |
| cache_delete(file_spec); | |
| // process | |
| const String& processed_body=r.process_to_string(body_code); | |
| // write it out | |
| r.write_assign_lang(processed_body); | |
| // happy with it | |
| return; | |
| } | } |
| PEND_CATCH | // never reached |
| } | |
| bool finalizer_failed=false; | static StringOrValue process_try_body_code(Request& r, Value* body_code) { |
| PTRY | return r.process(*body_code); |
| // FINALLY | } |
| if(body_failed) | static void _try_operator(Request& r, MethodParams& params) { |
| connection.rollback(); | Value& body_code=params.as_junction(0, "body_code must be code"); |
| else | Value& catch_code=params.as_junction(1, "catch_code must be code"); |
| connection.commit(); | |
| PCATCH(e) { // commit/rollback problem | Try_catch_result result=try_catch(r, |
| rethrow_me=e; finalizer_failed=true; | process_try_body_code, &body_code, |
| &catch_code); | |
| if(result.exception_should_be_handled) | |
| throw Exception("parser.runtime", | |
| result.exception_should_be_handled, | |
| "catch block must set $exception.handled to some boolean value, not string"); | |
| // write out processed body_code or catch_code | |
| r.write_pass_lang(result.processed_code); | |
| } | |
| static void _throw_operator(Request&, MethodParams& params) { | |
| if(params.count()==1) { | |
| if(HashStringValue *hash=params[0].get_hash()) { | |
| const char* type=0; | |
| if(Value* value=hash->get(exception_type_part_name)) | |
| type=value->as_string().cstr(); | |
| const String* source=0; | |
| if(Value* value=hash->get(exception_source_part_name)) | |
| source=&value->as_string(); | |
| const char* comment=0; | |
| if(Value* value=hash->get(exception_comment_part_name)) | |
| comment=value->as_string().cstr(); | |
| throw Exception(type, | |
| source?source:0, | |
| "%s", comment?comment:""); | |
| } else | |
| throw Exception("parser.runtime", | |
| 0, | |
| "one-param version has hash param"); | |
| } else { | |
| const char* type=params.as_string(0, "type must be string").cstr(); | |
| const String& source=params.as_string(1, "source must be string"); | |
| const char* comment=params.count()>2? params.as_string(2, "comment must be string").cstr() | |
| :0; | |
| throw Exception(type, &source, "%s", comment?comment:""); | |
| } | } |
| PEND_CATCH | } |
| // close connection [cache it] | static void _sleep_operator(Request& r, MethodParams& params) { |
| connection.close(); | double seconds=params.as_double(0, "seconds must be double", r); |
| // recall current connection from remembered | pa_sleep((int)trunc(seconds), (int)trunc(seconds*1000)); |
| r.connection=saved_connection; | } |
| if(body_failed || finalizer_failed) // were there an exception for us to rethrow? | #if defined(WIN32) && defined(_DEBUG) |
| PTHROW(rethrow_me.type(), rethrow_me.code(), | # define PA_BPT |
| rethrow_me.problem_source(), | static void _bpt(Request&, MethodParams&) { |
| rethrow_me.comment()); | _asm int 3; |
| } | } |
| #endif | |
| // constructor | |
| // initialize | VClassMAIN::VClassMAIN(): VClass() { |
| set_name(*new String(MAIN_CLASS_NAME)); | |
| #ifdef PA_BPT | |
| // ^bpt[] | |
| add_native_method("bpt", Method::CT_ANY, _bpt, 0, 0); | |
| #endif | |
| void initialize_op_class(Pool& pool, VStateless_class& vclass) { | |
| // ^if(condition){code-when-true} | // ^if(condition){code-when-true} |
| // ^if(condition){code-when-true}{code-when-false} | // ^if(condition){code-when-true}{code-when-false} |
| vclass.add_native_method("if", Method::CT_ANY, _if, 2, 3); | add_native_method("if", Method::CT_ANY, _if, 2, 3); |
| // ^untaint[as-is|uri|sql|js|html|html-typo]{code} | // ^untaint[as-is|uri|sql|js|html|html-typo]{code} |
| vclass.add_native_method("untaint", Method::CT_ANY, _untaint, 2, 2); | add_native_method("untaint", Method::CT_ANY, _untaint, 1, 2); |
| // ^taint[as-is|uri|sql|js|html|html-typo]{code} | // ^taint[as-is|uri|sql|js|html|html-typo]{code} |
| vclass.add_native_method("taint", Method::CT_ANY, _taint, 1, 2); | add_native_method("taint", Method::CT_ANY, _taint, 1, 2); |
| // ^process[code] | // ^process[code] |
| vclass.add_native_method("process", Method::CT_ANY, _process, 1, 1); | add_native_method("process", Method::CT_ANY, _process, 1, 3); |
| // ^rem{code} | // ^rem{code} |
| vclass.add_native_method("rem", Method::CT_ANY, _rem, 1, 1); | add_native_method("rem", Method::CT_ANY, _rem, 1, 10000); |
| // ^while(condition){code} | // ^while(condition){code} |
| vclass.add_native_method("while", Method::CT_ANY, _while, 2, 2); | add_native_method("while", Method::CT_ANY, _while, 2, 2); |
| // ^use[file] | // ^use[file] |
| vclass.add_native_method("use", Method::CT_ANY, _use, 1, 1); | add_native_method("use", Method::CT_ANY, _use, 1, 1); |
| // ^for[i;from-number;to-number-inclusive]{code}[delim] | // ^for[i](from-number;to-number-inclusive){code}[delim] |
| vclass.add_native_method("for", Method::CT_ANY, _for, 3+1, 3+1+1); | add_native_method("for", Method::CT_ANY, _for, 3+1, 3+1+1); |
| // ^eval(expr) | // ^eval(expr) |
| // ^eval(expr)[format] | // ^eval(expr)[format] |
| vclass.add_native_method("eval", Method::CT_ANY, _eval, 1, 2); | add_native_method("eval", Method::CT_ANY, _eval, 1, 2); |
| // ^connect[protocol://user:pass@host[:port]/database]{code with ^sql-s} | |
| add_native_method("connect", Method::CT_ANY, _connect, 2, 2); | |
| // math functions | |
| // ^round(expr) | // ^cache[file_spec](time){code}[{catch code}] time=0 no cache |
| vclass.add_native_method("round", Method::CT_ANY, _round, 1, 1); | // ^cache[file_spec] delete cache |
| add_native_method("cache", Method::CT_ANY, _cache, 1, 4); | |
| // switch | |
| // ^floor(expr) | // ^switch[value]{cases} |
| vclass.add_native_method("floor", Method::CT_ANY, _floor, 1, 1); | add_native_method("switch", Method::CT_ANY, _switch, 2, 2); |
| // ^ceiling(expr) | // ^case[value]{code} |
| vclass.add_native_method("ceiling", Method::CT_ANY, _ceiling, 1, 1); | add_native_method("case", Method::CT_ANY, _case, 2, 10000); |
| // ^abs(expr) | // try-catch |
| vclass.add_native_method("abs", Method::CT_ANY, _abs, 1, 1); | |
| // ^sign(expr) | // ^try{code}{catch code} |
| vclass.add_native_method("sign", Method::CT_ANY, _sign, 1, 1); | add_native_method("try", Method::CT_ANY, _try_operator, 2, 2); |
| // ^throw[$exception hash] | |
| // ^throw[type;source;comment] | |
| add_native_method("throw", Method::CT_ANY, _throw_operator, 1, 3); | |
| add_native_method("sleep", Method::CT_ANY, _sleep_operator, 1, 1); | |
| // connect | } |
| // ^connect[protocol://user:pass@host[:port]/database]{code with ^sql-s} | // constructor & configurator |
| vclass.add_native_method("connect", Method::CT_ANY, _connect, 2, 2); | |
| VStateless_class& VClassMAIN_create() { | |
| return *new VClassMAIN; | |
| } | } |