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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( coord, number, street, 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();
};