assert_util.h

// assert_util.h

/*    Copyright 2009 10gen Inc.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */


#pragma once

#include "../db/lasterror.h"

namespace mongo {

    enum CommonErrorCodes {
        DatabaseDifferCaseCode = 13297 ,
        StaleConfigInContextCode = 13388
    };

	/* these are manipulated outside of mutexes, so be careful */
    struct Assertion {
        Assertion() {
            msg[0] = msg[127] = 0;
            context[0] = context[127] = 0;
            file = "";
            line = 0;
            when = 0;
        }
    private:
        static mongo::mutex *_mutex;
        char msg[128];
        char context[128];
        const char *file;
        unsigned line;
        time_t when;
    public:
        void set(const char *m, const char *ctxt, const char *f, unsigned l) {
            if( _mutex == 0 ) {
                /* asserted during global variable initialization */
                return;
            }
            scoped_lock lk(*_mutex);
            strncpy(msg, m, 127);
            strncpy(context, ctxt, 127);
            file = f;
            line = l;
            when = time(0);
        }
        std::string toString();
        bool isSet() {
            return when != 0;
        }
    };

    enum {
        AssertRegular = 0,
        AssertW = 1,
        AssertMsg = 2,
        AssertUser = 3
    };

    /* last assert of diff types: regular, wassert, msgassert, uassert: */
    extern Assertion lastAssert[4];

    class AssertionCount {
    public:
        AssertionCount();
        void rollover();
        void condrollover( int newValue );

        int regular;
        int warning;
        int msg;
        int user;
        int rollovers;
    };
    
    extern AssertionCount assertionCount;
    
    struct ExceptionInfo {
        ExceptionInfo() : msg(""),code(-1){}
        ExceptionInfo( const char * m , int c )
            : msg( m ) , code( c ){
        }
        ExceptionInfo( const string& m , int c )
            : msg( m ) , code( c ){
        }

        void append( BSONObjBuilder& b , const char * m = "$err" , const char * c = "code" ) const ;
        
        string toString() const { stringstream ss; ss << "exception: " << code << " " << msg; return ss.str(); }

        bool empty() const { return msg.empty(); }
                

        string msg;
        int code;
    };

    class DBException : public std::exception {
    public:
        DBException( const ExceptionInfo& ei ) : _ei(ei){}
        DBException( const char * msg , int code ) : _ei(msg,code){}
        DBException( const string& msg , int code ) : _ei(msg,code){}
        virtual ~DBException() throw() { }
        
        virtual const char* what() const throw(){ return _ei.msg.c_str(); }
        virtual int getCode() const { return _ei.code; }
        
        virtual void appendPrefix( stringstream& ss ) const { }
        
        virtual string toString() const {
            stringstream ss; ss << getCode() << " " << what(); return ss.str();
            return ss.str();
        }
        
        const ExceptionInfo& getInfo() const { return _ei; }

    protected:
        ExceptionInfo _ei;
    };
    
    class AssertionException : public DBException {
    public:

        AssertionException( const ExceptionInfo& ei ) : DBException(ei){}
        AssertionException( const char * msg , int code ) : DBException(msg,code){}
        AssertionException( const string& msg , int code ) : DBException(msg,code){}

        virtual ~AssertionException() throw() { }
        
        virtual bool severe() { return true; }
        virtual bool isUserAssertion() { return false; }

        /* true if an interrupted exception - see KillCurrentOp */
        bool interrupted() { 
            return _ei.code == 11600 || _ei.code == 11601;
        }
    };
    
    /* UserExceptions are valid errors that a user can cause, like out of disk space or duplicate key */
    class UserException : public AssertionException {
    public:
        UserException(int c , const string& m) : AssertionException( m , c ){}

        virtual bool severe() { return false; }
        virtual bool isUserAssertion() { return true; }
        virtual void appendPrefix( stringstream& ss ) const { ss << "userassert:"; }
    };
    
    class MsgAssertionException : public AssertionException {
    public:
        MsgAssertionException( const ExceptionInfo& ei ) : AssertionException( ei ){}
        MsgAssertionException(int c, const string& m) : AssertionException( m , c ){}
        virtual bool severe() { return false; }
        virtual void appendPrefix( stringstream& ss ) const { ss << "massert:"; }
    };

    void asserted(const char *msg, const char *file, unsigned line);
    void wasserted(const char *msg, const char *file, unsigned line);
    void uasserted(int msgid, const char *msg);
    inline void uasserted(int msgid , string msg) { uasserted(msgid, msg.c_str()); }
    void uassert_nothrow(const char *msg); // reported via lasterror, but don't throw exception
    void msgassertedNoTrace(int msgid, const char *msg);
    void msgasserted(int msgid, const char *msg);
    inline void msgasserted(int msgid, string msg) { msgasserted(msgid, msg.c_str()); }

#ifdef assert
#undef assert
#endif

#define MONGO_assert(_Expression) (void)( (!!(_Expression)) || (mongo::asserted(#_Expression, __FILE__, __LINE__), 0) )
#define assert MONGO_assert

    /* "user assert".  if asserts, user did something wrong, not our code */
#define MONGO_uassert(msgid, msg, expr) (void)( (!!(expr)) || (mongo::uasserted(msgid, msg), 0) )
#define uassert MONGO_uassert

    /* warning only - keeps going */
#define MONGO_wassert(_Expression) (void)( (!!(_Expression)) || (mongo::wasserted(#_Expression, __FILE__, __LINE__), 0) )
#define wassert MONGO_wassert

    /* display a message, no context, and throw assertionexception

       easy way to throw an exception and log something without our stack trace
       display happening.
    */
#define MONGO_massert(msgid, msg, expr) (void)( (!!(expr)) || (mongo::msgasserted(msgid, msg), 0) )
#define massert MONGO_massert

    /* dassert is 'debug assert' -- might want to turn off for production as these
       could be slow.
    */
#if defined(_DEBUG)
# define MONGO_dassert assert
#else
# define MONGO_dassert(x) 
#endif
#define dassert MONGO_dassert

    // some special ids that we want to duplicate
    
    // > 10000 asserts
    // < 10000 UserException
    
    enum { ASSERT_ID_DUPKEY = 11000 };

    /* throws a uassertion with an appropriate msg */
    void streamNotGood( int code , string msg , std::ios& myios );

    inline void assertStreamGood(unsigned msgid, string msg, std::ios& myios) { 
        if( !myios.good() ) streamNotGood(msgid, msg, myios);
    }

    string demangleName( const type_info& typeinfo );

} // namespace mongo

#define BOOST_CHECK_EXCEPTION MONGO_BOOST_CHECK_EXCEPTION
#define MONGO_BOOST_CHECK_EXCEPTION( expression ) \
	try { \
		expression; \
	} catch ( const std::exception &e ) { \
        stringstream ss; \
		ss << "caught boost exception: " << e.what();   \
        msgasserted( 13294 , ss.str() );        \
	} catch ( ... ) { \
		massert( 10437 ,  "unknown boost failed" , false );   \
	}

#define DESTRUCTOR_GUARD MONGO_DESTRUCTOR_GUARD
#define MONGO_DESTRUCTOR_GUARD( expression ) \
    try { \
        expression; \
    } catch ( const std::exception &e ) { \
        problem() << "caught exception (" << e.what() << ") in destructor (" << __FUNCTION__ << ")" << endl; \
    } catch ( ... ) { \
        problem() << "caught unknown exception in destructor (" << __FUNCTION__ << ")" << endl; \
    }