action.cpp

mini http server,可以集成嵌入到程序中,实现简单的web功能

/*____________________________________________________________________________*\
 *

 Copyright (c) 1997-2003 John Roy, Holger Zimmermann. All rights reserved.

 These sources, libraries and applications are
 FREE FOR COMMERCIAL AND NON-COMMERCIAL USE
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 modification, are permitted provided that the following conditions
 are met:

 1. Redistributions of source code must retain the above copyright
    notice, this list of conditions and the following disclaimer. 

 2. Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions and the following disclaimer in
    the documentation and/or other materials provided with the
    distribution.

 3. The name of the author may not be used to endorse or promote products
    derived from this software without specific prior written permission.

 THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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 *____________________________________________________________________________*|
 *
 * $Source: /cvsroot/pi3web/Pi3Web_200/Source/HTTP/Action.cpp,v $
 * $Date: 2003/05/13 18:42:01 $
 *
 Description:
	Perform generic action.

\*____________________________________________________________________________*/
//$SourceTop:$

#include "Pi2API.h"
#include "Pi3Expr.h"
#include "PICompat.h"
#include "HandBase.h"
#include "PIStrStr.h"

/*____________________________________________________________________________*\
 *
 Description:
\*____________________________________________________________________________*/
#define KEY_CONF_PI3EXPRESSION		"Pi3Expression"

/*____________________________________________________________________________*\
 *
 Description:
	Documentation.
\*____________________________________________________________________________*/
#if 0
	/*
	** HTML documentation for this handler
	*/
/*___+++HTMLDOC_BEGIN+++___*/
Name:
	Action

Description:
	Evaluate a Pi3Expression to cause a side effect.

Options:
<H5>Overview</H5>
<TABLE BORDER=1>
<TH>Option
<TH>Default
<TH>Values
<TH>Short Description
<TH>Example(s)

<TR>
<TD>Pi3Expression
<TD>+
<TD>A Pi3Expression
<TD>Pi3Expression to evaulate
<TD>Pi3Expression="&dbreplace(response,string,ObjectMap,Scripts)"

</TABLE>
<STRONG>-</STRONG> in the <IT>default</IT> indicates no default<BR>
<STRONG>+</STRONG> in the <IT>default</IT> indicates the field is mandatory<BR>

<H4>Description of Options</H4>
<H5>
	Pi3Expression
</H5>
Specifies the Pi3Expression that will be evaulated. 

Phase:
	Any

Returns:
	PIAPI_ERROR if this handler was invoked for an inappropriate phase, 
	otherwise PIAPI_CONTINUE is returned.

Example:
	<PRE>
	&lt;Object&gt;
		Name Action
		Class ActionClass
	&lt;/Object&gt;

	&lt;Object&gt;
		...
		CheckType Action Pi3Expression="&dbreplace(response,rfc822,\
			Content-Type,text/plain)"
		...
	&lt;/Object&gt;

	</PRE>
/*___+++HTMLDOC_END+++___*/
#endif

/*____________________________________________________________________________*\
 *
 Class:
 Description:
\*____________________________________________________________________________*/
class Action : public HandlerBaseHTTP
{
private:
	/* ---
	Configuration data
	--- */
	Pi3Expression *pExpr;			/* expression to execute */

	/* --- parameters --- */
	int Parameter( const char *pVariable, const char *pValue,
		const char *pWhere )
		{
		assert( pVariable );
		assert( pValue );
		assert( pWhere );

		PIOStrStream os;
		os << pWhere << "SendPi3Expression: ";

		if ( !PIUtil_stricmp( KEY_CONF_PI3EXPRESSION, pVariable ) )
			{
			if ( pExpr )
				{
				os << "Pi3Expession already defined." << ends;
				CONFIG_ERR( Object(), os.str() );
				return 0;
				};
			Pi3String *pError = Pi3String_new( 0 );
			pExpr = Pi3Expression_new( pValue, 0, pError );
			if ( !pExpr )
				{
				os << Pi3String_getPtr( pError ) << ends;
				Pi3String_delete( pError );
				CONFIG_ERR( Object(), os.str() );
				delete pExpr;
				pExpr = 0;
				return 0;
				};
			Pi3String_delete( pError );
			}
		else
			{
			os << "Unknown directive '" << pVariable <<
				"'" << ends;
			CONFIG_ERR( Object(), os.str() );
			return 0;
			};

		return 1; 	/* --- not implemented --- */
		};

public:
	Action( PIObject *pTheObject, int iArgc, const char *ppArgv[] )
	:
		HandlerBaseHTTP( pTheObject ),
		pExpr( 0 )
		{
		ReadParameters( iArgc, ppArgv );

		/* --- 
		check values are valid
		--- */
		if ( !pExpr )
			{
			CONFIG_ERR( Object(), "Action: 'Pi3Expression' \
not defined or error in definition." );
			SetOK( 0 );
			return;
			};
		};

	~Action()
		{
		Pi3Expression_delete( pExpr );
		};

	inline int Handle( int /* iPhase */, PIHTTP &tPIHTTP, PIIOBuffer &/* tB */ )
		{
		if ( !Pi3Expression_write( pExpr, &tPIHTTP, 0, 0, 0 ) )
			{
			return PIAPI_CONTINUE;
			};

		return PIAPI_CONTINUE;
		};
};

/*____________________________________________________________________________*\
 *
 Function:
 Synopsis:
 Description:
\*____________________________________________________________________________*/
PUBLIC_PIAPI int Action_constructor( PIObject *pObj,
	int iArgc, const char *ppArgv[] )
{
	return HandlerBaseHTTP_constructor( pObj, PI_NEW( Action( pObj,
		iArgc, ppArgv ) ) );
}

#if 0
/*___+++CNF_BEGIN+++___*/
	<Class>
		Name ActionClass
		Type LogicExtension
		Library HTTP
		OnClassLoad HandlerBaseHTTP_onClassLoad
		Constructor Action_constructor
		CopyConstructor HandlerBaseHTTP_copyConstructor
		Destructor HandlerBaseHTTP_destructor
		Execute HandlerBaseHTTP_execute
	</Class>

	<Object>
		Name Action
		Class ActionClass
	</Object>

/*___+++CNF_END+++___*/
#endif