113 lines
4.3 KiB
C++
113 lines
4.3 KiB
C++
/* Copyright (C) 2004 J.F.Dockes
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the
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* Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifndef _MH_EXECM_H_INCLUDED_
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#define _MH_EXECM_H_INCLUDED_
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#include "mh_exec.h"
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#include "execmd.h"
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/**
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* Turn external document into internal one by executing an external filter.
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*
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* The command to execute, and its parameters, are stored in the "params"
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* which is built in mimehandler.cpp out of data from the mimeconf file.
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*
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* This version uses persistent filters which can handle multiple requests
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* without exiting (both multiple files and multiple documents per file),
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* with a simple question/response protocol.
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*
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* The data is exchanged in TLV fashion, in a way that should be
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* usable in most script languages. The basic unit has one line with a
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* data type and a count, followed by the data. A 'message' ends with
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* one empty line. A possible exchange:
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*
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* From recollindex (the message begins before 'Filename'):
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*
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Filename: 24
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/my/home/mail/somefolderIpath: 2
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22
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<Message ends here: because of the empty line after '22'
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*
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* Example answer:
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*
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Mimetype: 10
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text/plainData: 10
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0123456789
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<Message ends here because of empty line
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*
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* This format is both extensible and reasonably easy to parse.
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* While it's more fitted for python or perl on the script side, it
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* should even be sort of usable from the shell (ie: use dd to read
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* the counted data). Most alternatives would need data encoding in
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* some cases.
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*
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* Higher level dialog:
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* The c++ program is the master and sends request messages to the script. The
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* requests have the following fields:
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* - Filename: the file to process. This can be empty meaning that we
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* are requesting the next document in the current file.
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* - Ipath: this will be present only if we are requesting a specific
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* subdocument inside a container file (typically for preview, at query
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* time). Absent during indexing (ipaths are generated and sent back from
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* the script
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* - Mimetype: this is the mime type for the (possibly container) file.
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* Can be useful to filters which handle multiple types, like rclaudio.
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*
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* The script answers with messages having the following fields:
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* - Document: translated document data (typically, but not always, html)
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* - Ipath: ipath for the returned document. Can be used at query time to
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* extract a specific subdocument for preview. Not present or empty for
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* non-container files.
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* - Mimetype: mime type for the returned data (ie: text/html, text/plain)
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* - Eofnow: empty field: no document is returned and we're at eof.
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* - Eofnext: empty field: file ends after the doc returned by this message.
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* - SubdocError: no subdoc returned by this request, but file goes on.
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* (the indexer (1.14) treats this as a file-fatal error anyway).
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* - FileError: error, stop for this file.
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*/
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class MimeHandlerExecMultiple : public MimeHandlerExec {
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/////////
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// Things not reset by "clear()", additionally to those in MimeHandlerExec
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ExecCmd m_cmd;
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/////// End un-cleared stuff.
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public:
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MimeHandlerExecMultiple(RclConfig *cnf, const string& mt)
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: MimeHandlerExec(cnf, mt)
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{}
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// No resources to clean up, the ExecCmd destructor does it.
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virtual ~MimeHandlerExecMultiple() {}
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virtual bool set_document_file(const string &file_path) {
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m_filefirst = true;
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return MimeHandlerExec::set_document_file(file_path);
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}
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virtual bool next_document();
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// skip_to and clear inherited from MimeHandlerExec
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private:
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bool startCmd();
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bool readDataElement(string& name, string& data);
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bool m_filefirst;
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};
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#endif /* _MH_EXECM_H_INCLUDED_ */
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