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Merge pull request #385 from inaturalist/elasticmaps
Elasticmaps
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,171 @@ | ||
| const querystring = require( "querystring" ); | ||
| const _ = require( "lodash" ); | ||
| const Geohash = require( "latlon-geohash" ); | ||
| const MapGenerator = require( "./map_generator" ); | ||
| const ElasticRequest = require( "./elastic_request" ); | ||
| const util = require( "./util" ); | ||
| const esClient = require( "./es_client" ); | ||
|
|
||
| const ElasticMapper = { }; | ||
|
|
||
| ElasticMapper.renderMessage = ( res, message, status ) => { | ||
| res.set( "Content-Type", "text/html" ); | ||
| res.status( status ).send( message ).end( ); | ||
| }; | ||
|
|
||
| ElasticMapper.renderError = ( res, error ) => { | ||
| util.debug( error ); | ||
| if ( error.message && error.status ) { | ||
| ElasticMapper.renderMessage( res, error.message, error.status ); | ||
| } else { | ||
| ElasticMapper.renderMessage( res, "Error", 500 ); | ||
| } | ||
| }; | ||
|
|
||
| ElasticMapper.renderResult = ( req, res, data ) => { | ||
| if ( req.params.format === "grid.json" ) { | ||
| res.jsonp( data ); | ||
| } else { | ||
| res.writeHead( 200, { "Content-Type": "image/png" } ); | ||
| res.end( data ); | ||
| } | ||
| }; | ||
|
|
||
| ElasticMapper.geotileGridGeojson = hit => { | ||
| const parts = hit.key.split( "/" ); | ||
| MapGenerator.createMercator( ); | ||
| const bbox = MapGenerator.merc.bbox( parts[1], parts[2], parts[0] ); | ||
| return { | ||
| type: "Feature", | ||
| geometry: { | ||
| type: "Polygon", | ||
| coordinates: [[ | ||
| [bbox[0], bbox[1]], | ||
| [bbox[2], bbox[1]], | ||
| [bbox[2], bbox[3]], | ||
| [bbox[0], bbox[3]], | ||
| [bbox[0], bbox[1]] | ||
| ]] | ||
| }, | ||
| properties: { | ||
| cellCount: hit.doc_count | ||
| } | ||
| }; | ||
| }; | ||
|
|
||
| ElasticMapper.geohashGridGeojson = hit => { | ||
| const bbox = Geohash.bounds( hit.key ); | ||
| return { | ||
| type: "Feature", | ||
| geometry: { | ||
| type: "Polygon", | ||
| coordinates: [[ | ||
| [bbox.sw.lon, bbox.sw.lat], | ||
| [bbox.sw.lon, bbox.ne.lat], | ||
| [bbox.ne.lon, bbox.ne.lat], | ||
| [bbox.ne.lon, bbox.sw.lat], | ||
| [bbox.sw.lon, bbox.sw.lat] | ||
| ]] | ||
| }, | ||
| properties: { | ||
| cellCount: hit.doc_count | ||
| } | ||
| }; | ||
| }; | ||
|
|
||
| ElasticMapper.csvFromResult = ( req, result ) => { | ||
| if ( req.params.dataType === "geojson" ) { | ||
| return ElasticMapper.polygonCSVFromResult( req, result ); | ||
| } | ||
| let target; | ||
| if ( result.aggregations && result.aggregations.zoom1 ) { | ||
| target = _.sortBy( result.aggregations.zoom1.buckets, hit => ( | ||
| hit.geohash ? hit.geohash.hits.hits[0].sort[0] : null | ||
| ) ); | ||
| } else if ( result.hits ) { | ||
| target = result.hits.hits; | ||
| } else { return []; } | ||
| const fieldsToMap = ( req.query.source && req.query.source.includes ) | ||
| ? _.without( req.query.source.includes, "location" ) | ||
| : []; | ||
| fieldsToMap.push( "cellCount" ); | ||
| const csvData = _.map( target, hit => { | ||
| // grids get rendered as polygons | ||
| if ( req.geotilegrid && req.params.format !== "grid.json" ) { | ||
| return ElasticMapper.geotileGridGeojson( hit ); | ||
| } | ||
| if ( req.geogrid ) { | ||
| return ElasticMapper.geohashGridGeojson( hit ); | ||
| } | ||
| const fieldData = hit._source || hit.geohash.hits.hits[0]._source; | ||
| fieldData.private_location = !_.isEmpty( fieldData.private_location ); | ||
| if ( !hit._source && hit.geohash ) { | ||
| fieldData.cellCount = hit.geohash.hits.total.value; | ||
| } | ||
| const properties = { }; | ||
| let value; | ||
| _.each( fieldsToMap, f => { | ||
| if ( f.match( /\./ ) ) { | ||
| const parts = f.split( "." ); | ||
| if ( fieldData[parts[0]] && fieldData[parts[0]][parts[1]] ) { | ||
| value = fieldData[parts[0]][parts[1]]; | ||
| } else { | ||
| value = null; | ||
| } | ||
| } else { | ||
| value = fieldData[f] ? fieldData[f] : null; | ||
| } | ||
| if ( value === "F" ) { value = false; } | ||
| if ( value === "T" ) { value = true; } | ||
| properties[f] = value; | ||
| } ); | ||
| let latitude; | ||
| let longitude; | ||
| if ( req.geotilegrid ) { | ||
| const parts = hit.key.split( "/" ); | ||
| MapGenerator.createMercator( ); | ||
| const bbox = MapGenerator.merc.bbox( parts[1], parts[2], parts[0] ); | ||
| latitude = _.mean( [bbox[1], bbox[3]] ); | ||
| longitude = _.mean( [bbox[0], bbox[2]] ); | ||
| } else if ( _.isObject( fieldData.location ) ) { | ||
| latitude = fieldData.location.lat; | ||
| longitude = fieldData.location.lon; | ||
| } else { | ||
| const coords = fieldData.location.split( "," ); | ||
| latitude = Number( coords[0] ); | ||
| longitude = Number( coords[1] ); | ||
| } | ||
| if ( req.params.format === "grid.json" ) { | ||
| properties.latitude = latitude; | ||
| properties.longitude = longitude; | ||
| } | ||
| return { | ||
| type: "Feature", | ||
| geometry: { | ||
| type: "Point", | ||
| coordinates: [longitude, latitude] | ||
| }, | ||
| properties | ||
| }; | ||
| } ); | ||
| return csvData; | ||
| }; | ||
|
|
||
| ElasticMapper.polygonCSVFromResult = ( req, result ) => ( | ||
| _.map( result.hits.hits, hit => ( | ||
| { id: hit._source.id, geojson: hit._source.geometry_geojson } | ||
| ) ) | ||
| ); | ||
|
|
||
| ElasticMapper.printRequestLog = req => { | ||
| let logText = `[ ${new Date( ).toString( )}] GET /${req.params.style}` | ||
| + `/${req.params.zoom}/${req.params.x}` | ||
| + `/${req.params.y}.${req.params.format}`; | ||
| if ( !_.isEmpty( req.query ) ) { | ||
| logText += `?${querystring.stringify( req.query )}`; | ||
| } | ||
| logText += ` ${req.endTime - req.startTime}ms`; | ||
| util.debug( logText ); | ||
| }; | ||
|
|
||
| module.exports = ElasticMapper; |
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