642 lines
22 KiB
C++
642 lines
22 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) 2006 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: postgis.cc 44 2005-04-22 18:53:54Z pavlenko $
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// mapnik
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#include <mapnik/global.hpp>
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#include <mapnik/ptree_helpers.hpp>
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#ifdef MAPNIK_DEBUG
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//#include <mapnik/wall_clock_timer.hpp>
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#endif
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#include "connection_manager.hpp"
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#include "postgis.hpp"
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// boost
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#include <boost/algorithm/string.hpp>
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#include <boost/lexical_cast.hpp>
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#include <boost/tokenizer.hpp>
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#include <boost/format.hpp>
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// stl
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#include <string>
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#include <algorithm>
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#include <set>
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#include <sstream>
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#include <iomanip>
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#ifndef MAPNIK_BIG_ENDIAN
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#define WKB_ENCODING "NDR"
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#else
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#define WKB_ENCODING "XDR"
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#endif
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#define FMAX std::numeric_limits<double>::max()
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DATASOURCE_PLUGIN(postgis_datasource)
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const std::string postgis_datasource::GEOMETRY_COLUMNS="geometry_columns";
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const std::string postgis_datasource::SPATIAL_REF_SYS="spatial_ref_system";
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using std::clog;
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using std::endl;
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using boost::lexical_cast;
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using boost::bad_lexical_cast;
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using boost::shared_ptr;
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using mapnik::PoolGuard;
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using mapnik::attribute_descriptor;
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postgis_datasource::postgis_datasource(parameters const& params)
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: datasource(params),
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table_(*params_.get<std::string>("table","")),
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geometry_table_(*params_.get<std::string>("geometry_table","")),
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geometry_field_(*params_.get<std::string>("geometry_field","")),
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cursor_fetch_size_(*params_.get<int>("cursor_size",0)),
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row_limit_(*params_.get<int>("row_limit",0)),
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type_(datasource::Vector),
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srid_(*params_.get<int>("srid",0)),
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extent_initialized_(false),
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desc_(*params_.get<std::string>("type"),"utf-8"),
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creator_(params.get<std::string>("host"),
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params.get<std::string>("port"),
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params.get<std::string>("dbname"),
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params.get<std::string>("user"),
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params.get<std::string>("password")),
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bbox_token_("!bbox!"),
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scale_denom_token_("!scale_denominator!"),
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persist_connection_(*params_.get<mapnik::boolean>("persist_connection",true)),
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extent_from_subquery_(*params_.get<mapnik::boolean>("extent_from_subquery",false))
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//show_queries_(*params_.get<mapnik::boolean>("show_queries",false))
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{
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if (table_.empty()) throw mapnik::datasource_exception("PostGIS: missing <table> parameter");
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boost::optional<int> initial_size = params_.get<int>("inital_size",1);
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boost::optional<int> max_size = params_.get<int>("max_size",10);
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multiple_geometries_ = *params_.get<mapnik::boolean>("multiple_geometries",false);
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boost::optional<std::string> ext = params_.get<std::string>("extent");
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if (ext)
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{
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boost::char_separator<char> sep(",");
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boost::tokenizer<boost::char_separator<char> > tok(*ext,sep);
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unsigned i = 0;
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bool success = false;
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double d[4];
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for (boost::tokenizer<boost::char_separator<char> >::iterator beg=tok.begin();
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beg!=tok.end();++beg)
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{
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try
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{
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d[i] = boost::lexical_cast<double>(boost::trim_copy(*beg));
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}
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catch (boost::bad_lexical_cast & ex)
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{
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clog << *beg << " : " << ex.what() << "\nAre your coordinates each separated by commas?\n";
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break;
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}
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if (i==3)
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{
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success = true;
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break;
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}
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++i;
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}
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if (success)
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{
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extent_.init(d[0],d[1],d[2],d[3]);
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extent_initialized_ = true;
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}
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}
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ConnectionManager *mgr=ConnectionManager::instance();
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mgr->registerPool(creator_, *initial_size, *max_size);
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shared_ptr<Pool<Connection,ConnectionCreator> > pool=mgr->getPool(creator_.id());
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if (pool)
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{
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shared_ptr<Connection> conn = pool->borrowObject();
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if (conn && conn->isOK())
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{
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PoolGuard<shared_ptr<Connection>,
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shared_ptr<Pool<Connection,ConnectionCreator> > > guard(conn,pool);
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desc_.set_encoding(conn->client_encoding());
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if(geometry_table_.empty())
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{
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geometry_table_ = table_from_sql(table_);
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}
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std::string schema_name="";
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std::string::size_type idx = geometry_table_.find_last_of('.');
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if (idx!=std::string::npos)
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{
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schema_name = geometry_table_.substr(0,idx);
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geometry_table_ = geometry_table_.substr(idx+1);
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}
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else
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{
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geometry_table_ = geometry_table_.substr(0);
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}
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// If we do not know both the geometry_field and the srid
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// then first attempt to fetch the geometry name from a geometry_columns entry.
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// This will return no records if we are querying a bogus table returned
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// from the simplistic table parsing in table_from_sql() or if
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// the table parameter references a table, view, or subselect not
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// registered in the geometry columns.
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geometryColumn_ = geometry_field_;
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if (!geometryColumn_.length() > 0 || srid_ == 0)
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{
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std::ostringstream s;
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s << "SELECT f_geometry_column, srid FROM ";
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s << GEOMETRY_COLUMNS <<" WHERE f_table_name='" << unquote(geometry_table_) <<"'";
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if (schema_name.length() > 0)
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s << " AND f_table_schema='" << unquote(schema_name) << "'";
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if (geometry_field_.length() > 0)
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s << " AND f_geometry_column='" << unquote(geometry_field_) << "'";
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/*if (show_queries_)
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{
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clog << boost::format("PostGIS: sending query: %s\n") % s.str();
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}*/
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shared_ptr<ResultSet> rs=conn->executeQuery(s.str());
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if (rs->next())
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{
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geometryColumn_ = rs->getValue("f_geometry_column");
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if (srid_ == 0)
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{
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try
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{
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srid_ = lexical_cast<int>(rs->getValue("srid"));
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}
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catch (bad_lexical_cast &ex)
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{
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clog << "SRID: " << rs->getValue("srid") << ":" << ex.what() << endl;
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}
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}
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}
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rs->close();
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// If we still do not know the srid then we can try to fetch
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// it from the 'table_' parameter, which should work even if it is
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// a subselect as long as we know the geometry_field to query
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if (geometryColumn_.length() && srid_ <= 0)
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{
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s.str("");
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s << "SELECT SRID(\"" << geometryColumn_ << "\") AS srid FROM ";
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s << populate_tokens(table_) << " WHERE \"" << geometryColumn_ << "\" IS NOT NULL LIMIT 1;";
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/*if (show_queries_)
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{
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clog << boost::format("PostGIS: sending query: %s\n") % s.str();
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}*/
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shared_ptr<ResultSet> rs=conn->executeQuery(s.str());
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if (rs->next())
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{
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try
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{
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srid_ = lexical_cast<int>(rs->getValue("srid"));
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}
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catch (bad_lexical_cast &ex)
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{
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clog << "SRID: " << rs->getValue("srid") << ":" << ex.what() << endl;
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}
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}
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rs->close();
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}
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}
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if (srid_ == 0)
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{
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srid_ = -1;
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clog << "PostGIS: SRID warning, using srid=-1" << endl;
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}
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// At this point the geometry_field may still not be known
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// but we'll catch that where more useful...
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#ifdef MAPNIK_DEBUG
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clog << "PostGIS: using SRID=" << srid_ << endl;
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clog << "PostGIS: using geometry_column=" << geometryColumn_ << endl;
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#endif
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// collect attribute desc
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std::ostringstream s;
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s << "select * from " << populate_tokens(table_) << " limit 0";
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/*if (show_queries_)
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{
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clog << boost::format("PostGIS: sending query: %s\n") % s.str();
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}*/
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shared_ptr<ResultSet> rs=conn->executeQuery(s.str());
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int count = rs->getNumFields();
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for (int i=0;i<count;++i)
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{
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std::string fld_name=rs->getFieldName(i);
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int type_oid = rs->getTypeOID(i);
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switch (type_oid)
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{
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case 20: // int8
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case 21: // int2
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case 23: // int4
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desc_.add_descriptor(attribute_descriptor(fld_name,mapnik::Integer));
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break;
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case 700: // float4
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case 701: // float8
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case 1700: // numeric ??
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desc_.add_descriptor(attribute_descriptor(fld_name,mapnik::Double));
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case 1042: // bpchar
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case 1043: // varchar
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case 25: // text
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desc_.add_descriptor(attribute_descriptor(fld_name,mapnik::String));
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break;
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default: // should not get here
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#ifdef MAPNIK_DEBUG
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s.str("");
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s << "select oid, typname from pg_type where oid = " << type_oid;
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/*if (show_queries_)
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{
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clog << boost::format("PostGIS: sending query: %s\n") % s.str();
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}*/
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shared_ptr<ResultSet> rs_oid = conn->executeQuery(s.str());
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if (rs_oid->next())
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{
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clog << "PostGIS: unknown type = " << rs_oid->getValue("typname") << " (oid:" << rs_oid->getValue("oid") << ")\n";
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}
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else
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{
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clog << "PostGIS: unknown oid type =" << type_oid << endl;
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}
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rs_oid->close();
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#endif
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break;
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}
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}
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rs->close();
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}
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}
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}
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std::string const postgis_datasource::name_="postgis";
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std::string postgis_datasource::name()
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{
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return name_;
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}
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int postgis_datasource::type() const
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{
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return type_;
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}
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layer_descriptor postgis_datasource::get_descriptor() const
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{
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return desc_;
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}
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std::string postgis_datasource::sql_bbox(box2d<double> const& env) const
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{
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std::ostringstream b;
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if (srid_ > 0)
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b << "SetSRID(";
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b << "'BOX3D(";
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b << std::setprecision(16);
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b << env.minx() << " " << env.miny() << ",";
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b << env.maxx() << " " << env.maxy() << ")'::box3d";
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if (srid_ > 0)
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b << ", " << srid_ << ")";
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return b.str();
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}
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std::string postgis_datasource::populate_tokens(const std::string& sql) const
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{
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std::string populated_sql = sql;
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if ( boost::algorithm::icontains(sql,bbox_token_) )
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{
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box2d<double> max_env(-1 * FMAX,-1 * FMAX,FMAX,FMAX);
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std::string max_box = sql_bbox(max_env);
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boost::algorithm::replace_all(populated_sql,bbox_token_,max_box);
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}
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if ( boost::algorithm::icontains(sql,scale_denom_token_) )
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{
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std::string max_denom = lexical_cast<std::string>(FMAX);
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boost::algorithm::replace_all(populated_sql,scale_denom_token_,max_denom);
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}
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return populated_sql;
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}
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std::string postgis_datasource::populate_tokens(const std::string& sql, double const& scale_denom, box2d<double> const& env) const
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{
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std::string populated_sql = sql;
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std::string box = sql_bbox(env);
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if ( boost::algorithm::icontains(populated_sql,scale_denom_token_) )
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{
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std::string max_denom = lexical_cast<std::string>(scale_denom);
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boost::algorithm::replace_all(populated_sql,scale_denom_token_,max_denom);
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}
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if ( boost::algorithm::icontains(populated_sql,bbox_token_) )
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{
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boost::algorithm::replace_all(populated_sql,bbox_token_,box);
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return populated_sql;
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}
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else
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{
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std::ostringstream s;
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s << " WHERE \"" << geometryColumn_ << "\" && " << box;
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return populated_sql + s.str();
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}
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}
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std::string postgis_datasource::unquote(const std::string& sql)
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{
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std::string table_name = boost::algorithm::to_lower_copy(sql);
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boost::algorithm::trim_if(table_name,boost::algorithm::is_any_of("\""));
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return table_name;
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}
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// TODO - make smarter and potentially move to reusable utilities
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// available to other SQL-based plugins
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std::string postgis_datasource::table_from_sql(const std::string& sql)
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{
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std::string table_name = boost::algorithm::to_lower_copy(sql);
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boost::algorithm::replace_all(table_name,"\n"," ");
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std::string::size_type idx = table_name.rfind(" from ");
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if (idx!=std::string::npos)
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{
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idx=table_name.find_first_not_of(" ",idx+5);
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if (idx != std::string::npos)
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{
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table_name=table_name.substr(idx);
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}
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idx=table_name.find_first_of(" )");
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if (idx != std::string::npos)
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{
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table_name = table_name.substr(0,idx);
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}
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}
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return table_name;
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}
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boost::shared_ptr<IResultSet> postgis_datasource::get_resultset(boost::shared_ptr<Connection> const &conn, const std::string &sql) const
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{
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if (cursor_fetch_size_ > 0) {
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// cursor
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std::ostringstream csql;
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std::string cursor_name = conn->new_cursor_name();
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csql << "DECLARE " << cursor_name << " BINARY INSENSITIVE NO SCROLL CURSOR WITH HOLD FOR " << sql << " FOR READ ONLY";
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/*if (show_queries_)
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{
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clog << boost::format("PostGIS: sending query: %s\n") % csql.str();
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}*/
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if (!conn->execute(csql.str())) {
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throw mapnik::datasource_exception( "PSQL Error: Creating cursor for data select." );
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}
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return shared_ptr<CursorResultSet>(new CursorResultSet(conn, cursor_name, cursor_fetch_size_));
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} else {
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// no cursor
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/*if (show_queries_)
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{
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clog << boost::format("PostGIS: sending query: %s\n") % sql;
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}*/
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return conn->executeQuery(sql,1);
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}
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}
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featureset_ptr postgis_datasource::features(const query& q) const
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{
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#ifdef MAPNIK_DEBUG
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//mapnik::wall_clock_progress_timer timer(clog, "end feature query: ");
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#endif
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box2d<double> const& box = q.get_bbox();
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double scale_denom = q.scale_denominator();
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ConnectionManager *mgr=ConnectionManager::instance();
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shared_ptr<Pool<Connection,ConnectionCreator> > pool=mgr->getPool(creator_.id());
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if (pool)
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{
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shared_ptr<Connection> conn = pool->borrowObject();
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if (conn && conn->isOK())
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{
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PoolGuard<shared_ptr<Connection>,shared_ptr<Pool<Connection,ConnectionCreator> > > guard(conn,pool);
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if (!geometryColumn_.length() > 0)
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{
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std::ostringstream s_error;
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s_error << "PostGIS: geometry name lookup failed for table '" << geometry_table_
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<< "'. Please manually provide the 'geometry_field' parameter or add an entry "
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<< "in the geometry_columns for '" << geometry_table_ << "'.";
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throw mapnik::datasource_exception(s_error.str());
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}
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std::ostringstream s;
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s << "SELECT AsBinary(\"" << geometryColumn_ << "\",'" << WKB_ENCODING << "') AS geom";
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std::set<std::string> const& props=q.property_names();
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std::set<std::string>::const_iterator pos=props.begin();
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std::set<std::string>::const_iterator end=props.end();
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while (pos != end)
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{
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s <<",\""<<*pos<<"\"";
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++pos;
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}
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std::string table_with_bbox = populate_tokens(table_,scale_denom,box);
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s << " from " << table_with_bbox;
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if (row_limit_ > 0) {
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s << " LIMIT " << row_limit_;
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}
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boost::shared_ptr<IResultSet> rs = get_resultset(conn, s.str());
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return featureset_ptr(new postgis_featureset(rs,desc_.get_encoding(),multiple_geometries_,props.size()));
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}
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}
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return featureset_ptr();
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}
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featureset_ptr postgis_datasource::features_at_point(coord2d const& pt) const
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{
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|
ConnectionManager *mgr=ConnectionManager::instance();
|
|
shared_ptr<Pool<Connection,ConnectionCreator> > pool=mgr->getPool(creator_.id());
|
|
if (pool)
|
|
{
|
|
shared_ptr<Connection> conn = pool->borrowObject();
|
|
if (conn && conn->isOK())
|
|
{
|
|
PoolGuard<shared_ptr<Connection>,shared_ptr<Pool<Connection,ConnectionCreator> > > guard(conn,pool);
|
|
std::ostringstream s;
|
|
|
|
if (!geometryColumn_.length() > 0)
|
|
{
|
|
std::ostringstream s_error;
|
|
s_error << "PostGIS: geometry name lookup failed for table '" << geometry_table_
|
|
<< "'. Please manually provide the 'geometry_field' parameter or add an entry "
|
|
<< "in the geometry_columns for '" << geometry_table_ << "'.";
|
|
throw mapnik::datasource_exception(s_error.str());
|
|
}
|
|
|
|
s << "SELECT AsBinary(\"" << geometryColumn_ << "\",'" << WKB_ENCODING << "') AS geom";
|
|
|
|
std::vector<attribute_descriptor>::const_iterator itr = desc_.get_descriptors().begin();
|
|
std::vector<attribute_descriptor>::const_iterator end = desc_.get_descriptors().end();
|
|
unsigned size=0;
|
|
while (itr != end)
|
|
{
|
|
s << ",\"" << itr->get_name() << "\"";
|
|
++itr;
|
|
++size;
|
|
}
|
|
|
|
box2d<double> box(pt.x,pt.y,pt.x,pt.y);
|
|
std::string table_with_bbox = populate_tokens(table_,FMAX,box);
|
|
|
|
s << " from " << table_with_bbox;
|
|
|
|
if (row_limit_ > 0) {
|
|
s << " LIMIT " << row_limit_;
|
|
}
|
|
|
|
boost::shared_ptr<IResultSet> rs = get_resultset(conn, s.str());
|
|
return featureset_ptr(new postgis_featureset(rs,desc_.get_encoding(),multiple_geometries_, size));
|
|
}
|
|
}
|
|
return featureset_ptr();
|
|
}
|
|
|
|
box2d<double> postgis_datasource::envelope() const
|
|
{
|
|
if (extent_initialized_) return extent_;
|
|
|
|
ConnectionManager *mgr=ConnectionManager::instance();
|
|
shared_ptr<Pool<Connection,ConnectionCreator> > pool=mgr->getPool(creator_.id());
|
|
if (pool)
|
|
{
|
|
shared_ptr<Connection> conn = pool->borrowObject();
|
|
if (conn && conn->isOK())
|
|
{
|
|
PoolGuard<shared_ptr<Connection>,shared_ptr<Pool<Connection,ConnectionCreator> > > guard(conn,pool);
|
|
std::ostringstream s;
|
|
boost::optional<std::string> estimate_extent = params_.get<std::string>("estimate_extent");
|
|
|
|
if (!geometryColumn_.length() > 0)
|
|
{
|
|
std::ostringstream s_error;
|
|
s_error << "PostGIS: unable to query the layer extent of table '"
|
|
<< geometry_table_ << "' because we cannot determine the geometry field name."
|
|
<< "\nPlease provide either 1) an 'extent' parameter to skip this query, "
|
|
<< "2) a 'geometry_field' and/or 'geometry_table' parameter, or 3) add a "
|
|
<< "record to the 'geometry_columns' for your table.";
|
|
throw mapnik::datasource_exception(s_error.str());
|
|
}
|
|
// TODO - do we need to respect schema here?
|
|
if (estimate_extent && *estimate_extent == "true")
|
|
{
|
|
s << "select xmin(ext),ymin(ext),xmax(ext),ymax(ext)"
|
|
<< " from (select estimated_extent('"
|
|
<< geometry_table_ << "','"
|
|
<< geometryColumn_ << "') as ext) as tmp";
|
|
}
|
|
else
|
|
{
|
|
s << "select xmin(ext),ymin(ext),xmax(ext),ymax(ext)"
|
|
<< " from (select extent(" <<geometryColumn_<< ") as ext from ";
|
|
if (extent_from_subquery_)
|
|
// if a subselect limits records then calculating the extent upon the
|
|
// subquery will be faster and the bounds will be more accurate
|
|
s << populate_tokens(table_) << ") as tmp";
|
|
else
|
|
// but if the subquery does not limit records then querying the
|
|
// actual table will be faster as indexes can be used
|
|
s << geometry_table_ << ") as tmp";
|
|
}
|
|
|
|
/*if (show_queries_)
|
|
{
|
|
clog << boost::format("PostGIS: sending query: %s\n") % s.str();
|
|
}*/
|
|
|
|
shared_ptr<ResultSet> rs=conn->executeQuery(s.str());
|
|
if (rs->next())
|
|
{
|
|
try
|
|
{
|
|
double lox=lexical_cast<double>(rs->getValue(0));
|
|
double loy=lexical_cast<double>(rs->getValue(1));
|
|
double hix=lexical_cast<double>(rs->getValue(2));
|
|
double hiy=lexical_cast<double>(rs->getValue(3));
|
|
extent_.init(lox,loy,hix,hiy);
|
|
extent_initialized_ = true;
|
|
}
|
|
catch (bad_lexical_cast &ex)
|
|
{
|
|
clog << boost::format("PostGIS: warning: could not determine extent from query: %s\nError was: '%s'\n") % s.str() % ex.what();
|
|
}
|
|
}
|
|
rs->close();
|
|
}
|
|
}
|
|
return extent_;
|
|
}
|
|
|
|
postgis_datasource::~postgis_datasource()
|
|
{
|
|
if (!persist_connection_)
|
|
{
|
|
ConnectionManager *mgr=ConnectionManager::instance();
|
|
shared_ptr<Pool<Connection,ConnectionCreator> > pool=mgr->getPool(creator_.id());
|
|
if (pool)
|
|
{
|
|
shared_ptr<Connection> conn = pool->borrowObject();
|
|
if (conn)
|
|
{
|
|
conn->close();
|
|
}
|
|
}
|
|
}
|
|
}
|