var logger = require( 'pelias-logger' ).get( 'api' ), request = require( 'superagent' ), peliasConfig = require( 'pelias-config' ); /** language subsitution service client this file provides a 'transport' which can be used to access the language service via a network connnection. the exported method for this module checks pelias-config for a configuration block such as: "language": { "client": { "adapter": "http", "host": "http://localhost:6100" } } for more info on running the service see: https://github.com/pelias/placeholder **/ /** NullTransport disables the service completely **/ function NullTransport(){} NullTransport.prototype.query = function( ids, cb ){ cb(); // no-op }; /** HttpTransport allows the api to be used via a remote web service **/ function HttpTransport( host, settings ){ this.query = function( ids, cb ){ request .get( host + '/parser/findbyid' ) .set( 'Accept', 'application/json' ) .query({ ids: Array.isArray( ids ) ? ids.join(',') : '' }) .timeout( settings && settings.timeout || 1000 ) .end( function( err, res ){ if( err || !res ){ return cb( err ); } if( 200 !== res.status ){ return cb( 'non 200 status' ); } return cb( null, res.body ); }); }; } HttpTransport.prototype.query = function( coord, number, street, cb ){ throw new Error( 'language: transport not connected' ); }; /** Setup allows instantiation of transport depending on configuration and preference **/ module.exports.findById = function setup(){ // user config var config = peliasConfig.generate(); // ensure config variables set correctly if( !config.hasOwnProperty('language') || !config.language.hasOwnProperty('client') ){ logger.warn( 'language: configuration not found' ); } // valid configuration found else { // get adapter settings from config var settings = config.language.client; // http adapter if( 'http' === settings.adapter && settings.hasOwnProperty('host') ){ logger.info( 'language: using http transport:', settings.host ); if( settings.hasOwnProperty('timeout') ){ return new HttpTransport( settings.host, { timeout: parseInt( settings.timeout, 10 ) } ); } return new HttpTransport( settings.host ); } } // default adapter logger.info( 'language: using null transport' ); return new NullTransport(); };