gistfile1.js

function getPageContext(postId, cb){
  var params = { postId: postId }
  var result = { currentPage: null, comments: [] }

  matchDb.createMatchStream(['post', 'post_comment'], {
    params: params, 
    tail: false
  }).on('data', function(data){

    if (data.matcher.ref === 'post'){
      result.currentPage = data.value
    } else if (data.matcher.ref === 'post_comment')
      result.comments.push(data.value)
    }

  }).on('end', function(){
  
    cb(null, result)

  })
}