unzip_in_memory.js

    var req = https.request(options, function(res) {
      console.log("statusCode: ", res.statusCode);
      //console.log("headers: ", res.headers);
      var data = [], data_length = 0;
      res.on('data', function(d) {
        data.push(d);
        data_length += d.length;
      }).on('end', function() {
        var buf = new Buffer(data_length);

        for (var i=0, len = data.length, pos = 0; i < len; i++) {
          data[i].copy(buf, pos);
          pos += data[i].length;
        }

        var zip = new AdmZip(buf);
        var new_zip = new AdmZip();

        var zipEntries = zip.getEntries();

        zipEntries.forEach(function(zipEntry) {
          file_name = zipEntry.entryName;
          new_file_name = file_name.substring(file_name.indexOf("/") + 1);
          if (new_file_name === "") {
            return
          } else {
            console.log(file_name+" -> "+new_file_name);
            new_zip.addFile(new_file_name, new Buffer(zip.readFile(zipEntry)), "entry comment goes here");
          }
        });

        var params = {
          FunctionName: 'arn:aws:lambda:us-east-1:REMOVED:function:REMOVED',
          ZipFile: new_zip.toBuffer()
        };
        lambda.updateFunctionCode(params, function(err, data) {
          if (err) console.log(err, err.stack);
          context.done(null, 'Function Finished!');
        });