'use strict';
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const http = require('http');
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const SERVER = Symbol('http_server');
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module.exports = app => {
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let server = app[SERVER] || app.callback();
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if (typeof server === 'function') {
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server = http.createServer(server);
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// cache server, avoid create many times
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app[SERVER] = server;
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// emit server event just like egg-cluster does
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// https://github.com/eggjs/egg-cluster/blob/master/lib/app_worker.js#L52
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app.emit('server', server);
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}
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return server;
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};
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