243 lines
8.4 KiB
C++
243 lines
8.4 KiB
C++
/*****************************************************************************
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*
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* This file is part of Mapnik (c++ mapping toolkit)
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*
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* Copyright (C) 2011 Artem Pavlenko
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*****************************************************************************/
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//$Id: datasource_cache.cpp 23 2005-03-22 22:16:34Z pavlenko $
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// mapnik
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#include <mapnik/datasource_cache.hpp>
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#include <mapnik/config_error.hpp>
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// boost
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#include <boost/version.hpp>
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#include <boost/make_shared.hpp>
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#include <boost/filesystem/operations.hpp>
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#include <boost/algorithm/string.hpp>
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// ltdl
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#include <ltdl.h>
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// stl
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#include <algorithm>
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#include <iostream>
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#include <stdexcept>
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namespace mapnik
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{
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bool is_input_plugin (std::string const& filename)
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{
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return boost::algorithm::ends_with(filename,std::string(".input"));
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}
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datasource_cache::datasource_cache()
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{
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if (lt_dlinit()) throw std::runtime_error("lt_dlinit() failed");
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}
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datasource_cache::~datasource_cache()
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{
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lt_dlexit();
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}
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std::map<std::string,boost::shared_ptr<PluginInfo> > datasource_cache::plugins_;
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bool datasource_cache::registered_=false;
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std::vector<std::string> datasource_cache::plugin_directories_;
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datasource_ptr datasource_cache::create(const parameters& params, bool bind)
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{
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boost::optional<std::string> type = params.get<std::string>("type");
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if ( ! type)
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{
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throw config_error(std::string("Could not create datasource. Required ") +
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"parameter 'type' is missing");
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}
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datasource_ptr ds;
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std::map<std::string,boost::shared_ptr<PluginInfo> >::iterator itr=plugins_.find(*type);
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if ( itr == plugins_.end() )
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{
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throw config_error(std::string("Could not create datasource. No plugin ") +
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"found for type '" + * type + "' (searched in: " + plugin_directories() + ")");
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}
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if ( ! itr->second->handle())
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{
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throw std::runtime_error(std::string("Cannot load library: ") +
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lt_dlerror());
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}
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// http://www.mr-edd.co.uk/blog/supressing_gcc_warnings
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#ifdef __GNUC__
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__extension__
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#endif
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create_ds* create_datasource =
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reinterpret_cast<create_ds*>(lt_dlsym(itr->second->handle(), "create"));
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if ( ! create_datasource)
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{
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throw std::runtime_error(std::string("Cannot load symbols: ") +
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lt_dlerror());
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}
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#ifdef MAPNIK_DEBUG
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std::clog << "size = " << params.size() << "\n";
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parameters::const_iterator i = params.begin();
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for (;i!=params.end();++i)
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{
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std::clog << i->first << "=" << i->second << "\n";
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}
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#endif
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ds=datasource_ptr(create_datasource(params, bind), datasource_deleter());
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#ifdef MAPNIK_DEBUG
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std::clog<<"datasource="<<ds<<" type="<<type<<std::endl;
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#endif
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return ds;
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}
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bool datasource_cache::insert(const std::string& type,const lt_dlhandle module)
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{
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return plugins_.insert(make_pair(type,boost::make_shared<PluginInfo>
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(type,module))).second;
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}
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std::string datasource_cache::plugin_directories()
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{
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return boost::algorithm::join(plugin_directories_,", ");
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}
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std::vector<std::string> datasource_cache::plugin_names ()
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{
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std::vector<std::string> names;
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std::map<std::string,boost::shared_ptr<PluginInfo> >::const_iterator itr;
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for (itr = plugins_.begin();itr!=plugins_.end();++itr)
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{
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names.push_back(itr->first);
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}
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return names;
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}
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void datasource_cache::register_datasources(const std::string& str)
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{
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#ifdef MAPNIK_THREADSAFE
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mutex::scoped_lock lock(mapnik::singleton<mapnik::datasource_cache,
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mapnik::CreateStatic>::mutex_);
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#endif
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boost::filesystem::path path(str);
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plugin_directories_.push_back(str);
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boost::filesystem::directory_iterator end_itr;
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if (exists(path) && is_directory(path))
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{
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for (boost::filesystem::directory_iterator itr(path);itr!=end_itr;++itr )
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{
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#if BOOST_VERSION < 103400
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if (!is_directory( *itr ) && is_input_plugin(itr->leaf()))
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#else
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#if (BOOST_FILESYSTEM_VERSION == 3)
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if (!is_directory( *itr ) && is_input_plugin(itr->path().filename().string()))
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#else // v2
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if (!is_directory( *itr ) && is_input_plugin(itr->path().leaf()))
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#endif
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#endif
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{
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try
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{
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#ifdef LIBTOOL_SUPPORTS_ADVISE
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/* Note: the below was added as a workaround pre http://trac.mapnik.org/ticket/790
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It could now be removed, but also is not doing any harm AFAICT.
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*/
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// with ltdl >=2.2 we can actually pass RTDL_GLOBAL to dlopen via the
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// ltdl advise trick which is required on linux unless plugins are directly
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// linked to libmapnik (and deps) at build time. The only other approach is to
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// set the dlopen flags in the calling process (like in the python bindings)
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// clear errors
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lt_dlerror();
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lt_dlhandle module = 0;
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lt_dladvise advise;
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int ret;
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ret = lt_dlinit();
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if (ret != 0) {
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std::clog << "Datasource loader: could not intialize dynamic loading: " << lt_dlerror() << "\n";
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}
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ret = lt_dladvise_init(&advise);
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if (ret != 0) {
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std::clog << "Datasource loader: could not intialize dynamic loading: " << lt_dlerror() << "\n";
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}
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ret = lt_dladvise_global(&advise);
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if (ret != 0) {
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std::clog << "Datasource loader: could not intialize dynamic loading of global symbols: " << lt_dlerror() << "\n";
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}
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#if (BOOST_FILESYSTEM_VERSION == 3)
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module = lt_dlopenadvise (itr->path().string().c_str(), advise);
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#else // v2
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module = lt_dlopenadvise (itr->string().c_str(), advise);
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#endif
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lt_dladvise_destroy(&advise);
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#else
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#if (BOOST_FILESYSTEM_VERSION == 3)
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lt_dlhandle module = lt_dlopen(itr->path().string().c_str());
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#else // v2
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lt_dlhandle module = lt_dlopen(itr->string().c_str());
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#endif
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#endif
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if (module)
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{
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// http://www.mr-edd.co.uk/blog/supressing_gcc_warnings
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#ifdef __GNUC__
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__extension__
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#endif
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datasource_name* ds_name =
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reinterpret_cast<datasource_name*>(lt_dlsym(module, "datasource_name"));
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if (ds_name && insert(ds_name(),module))
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{
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#ifdef MAPNIK_DEBUG
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std::clog << "Datasource loader: registered: " << ds_name() << std::endl;
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#endif
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registered_=true;
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}
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}
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else
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{
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#if (BOOST_FILESYSTEM_VERSION == 3)
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std::clog << "Problem loading plugin library: " << itr->path().string()
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<< " (dlopen failed - plugin likely has an unsatisfied dependency or incompatible ABI)" << std::endl;
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#else // v2
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std::clog << "Problem loading plugin library: " << itr->string()
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<< " (dlopen failed - plugin likely has an unsatisfied dependency or incompatible ABI)" << std::endl;
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#endif
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}
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}
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catch (...) {}
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}
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}
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}
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}
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}
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