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index.js
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index.js
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var async = require('async');
var dependency = require('tilestrata-dependency');
var blend = require('./blend.js');
module.exports = function(layers, options) {
options = options || {};
var layers = layers.map(function(pair) {
var layer = pair[0];
var filename = pair[1];
return dependency(layer, filename);
});
return {
serve: function(server, req, callback) {
var grids, result;
async.series([
function loadTiles(callback) {
async.map(layers, function(layer, callback) {
layer.serve(server, req, function(err, buffer, headers) {
var data = buffer._utfgrid || JSON.parse(buffer.toString('utf8'));
callback(err, data);
});
}, function(err, result) {
grids = result;
callback(err);
});
},
function blendTiles(callback) {
var merged = blend(grids, options);
result = new Buffer(JSON.stringify(merged), 'utf8');
result._utfgrid = merged;
grids = null;
callback();
}
], function(err) {
if (err) return callback(err);
callback(null, result, {'Content-Type': 'application/json'});
});
}
};
};