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/* $Id: Cache.cpp,v 1.12 2004/08/20 02:42:45 terpstra Exp $
*
* Cache.h - Helper which transforms xml -> html and caches files
*
* Copyright (C) 2002 - Wesley W. Terpstra
*
* License: GPL
*
* Authors: 'Wesley W. Terpstra' <wesley@terpstra.ca>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#define _XOPEN_SOURCE 500
#define _FILE_OFFSET_BITS 64
#include "Cache.h"
#include "commands.h"
#include <cerrno>
#include <cstring>
#include <cassert>
#include <unistd.h>
class streambug : public std::streambuf
{
public:
streambug();
void set_target(FILE* t) { target = t; }
protected:
int overflow(int);
int sync();
private:
FILE* target;
char buf[128]; //8192];
};
streambug::streambug()
: target(0)
{
setp(&buf[0], &buf[sizeof(buf)-1]);
setg(0,0,0); // output only
}
int streambug::overflow(int c)
{
assert (target);
// Make sure there is a put area
if (!pptr()) setp(&buf[0], &buf[sizeof(buf)-1]);
// Determine how many characters have been
// inserted but not consumed.
std::streamsize w = pptr() - pbase();
// If c is not EOF it is a character that must
// also be consumed.
if (c != EOF)
{
// We always leave space
*pptr() = c;
++w;
}
// consume characters.
if ((std::streamsize)fwrite(pbase(), 1, w, target) == w)
{ // Set up put area. Be sure that there
// is space at end for one extra character.
setp(&buf[0], &buf[sizeof(buf)-1]);
if (c == EOF) return 0;
return c;
}
else
{ // Indicate error.
setp(0, 0);
return EOF;
}
}
int streambug::sync()
{
if (pptr() && pptr() > pbase())
{ // Flush waiting output
return overflow(EOF);
}
return 0;
}
Cache::Cache(const Config& cfg, const string& command, const string& parameter, const string& ext)
: bug(new streambug), o(bug)
{
if (chdir(command.c_str()) != 0)
error(_("Entering command dir"), command + ":" + strerror(errno),
_("Perhaps the directory does not exist to which "
"the cache file is being written."));
if (cfg.web_cache)
{
cache = fopen(parameter.c_str(), "w+");
if (!cache)
error(_("Creating cache file"), parameter + ":" + strerror(errno),
_("Perhaps the user which runs lurker.cgi does not have write "
"permissions to this directory."));
}
else
{
cache = stdout;
}
if (ext == "html")
{
char buf[10] = "";
if (cache != stdout) sprintf(buf, " >&%d", fileno(cache));
string command = cfg.xslt + buf;
output = popen(command.c_str(), "w");
if (!output)
error(_("Opening xslt pipeline"), strerror(errno),
_("The specified xslt pipeline in your config "
"file, entry xslt, could not be opened. "
"Please ensure that the command correctly "
"streams xml into html for you."));
cout << "Status: 200 OK\r\n";
cout << "Content-Type: text/html; charset=UTF-8\r\n\r\n";
}
else if (ext == "txt")
{
cout << "Status: 200 OK\r\n";
cout << "Content-Type: text/plain\r\n\r\n";
output = cache;
}
else if (ext == "rfc822")
{
cout << "Status: 200 OK\r\n";
cout << "Content-Type: message/rfc822\r\n\r\n";
output = cache;
}
else if (ext == "xml")
{
cout << "Status: 200 OK\r\n";
cout << "Content-Type: text/xml; charset=UTF-8\r\n\r\n";
output = cache;
}
else
{
error(_("Unknown file type"), ext,
_("The requested extension is not supported by lurker. "
"Please reformulate your request."));
}
cout.flush(); // in case of stdout writing next (ick)
bug->set_target(output);
}
Cache::~Cache()
{
o.flush();
if (output != cache)
pclose(output);
if (cache != stdout)
{
// reset to the start of the cache file
fflush(cache);
fseek(cache, 0, SEEK_SET);
fflush(cache);
// Begin streaming to cout
char buf[4096];
size_t got;
while ((got = fread(buf, 1, sizeof(buf), cache)) != 0)
cout.write(buf, got);
}
// All done!
}
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