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| <!doctype html> | |
| <html> | |
| <head><title>Index</title> | |
| </head> | |
| <body> | |
| <script type="text/javascript"> | |
| var source = new EventSource('eventsource'); | |
| source.onmessage = function (e) { | |
| var newListItem = document.createElement("LI"); | |
| newListItem.appendChild(document.createTextNode(e.data)); | |
| document.getElementById("list").appendChild(newListItem); | |
| }; | |
| </script> | |
| <ul id="list"> | |
| </ul> | |
| </body> | |
| </html> |
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| {-# LANGUAGE OverloadedStrings #-} | |
| module Main where | |
| import Control.Applicative | |
| import Snap.Core | |
| import Snap.Util.FileServe | |
| import Snap.Http.Server | |
| import Data.Monoid (mconcat) | |
| import Blaze.ByteString.Builder.Char8 | |
| import Blaze.ByteString.Builder | |
| import Data.Enumerator.List (generateM) | |
| import Database.Redis | |
| getVal :: IO Builder | |
| getVal = do | |
| conn <- connect defaultConnectInfo | |
| runRedis conn $ do | |
| Right (Just (_, val)) <- brpop ["val"] 1000 | |
| return $ fromByteString val | |
| dataField :: Builder -> Builder | |
| dataField b = mconcat [fromString "data: ", b, fromString "\n\n", flush] | |
| eventHandler :: Snap () | |
| eventHandler = do | |
| modifyResponse $ | |
| setContentType "text/event-stream" . | |
| setResponseCode 200 . | |
| setResponseBody (generateM $ fmap (Just . dataField) getVal) | |
| main :: IO () | |
| main = quickHttpServe $ | |
| ifTop (serveFile "static/index.html") <|> | |
| route [ ("eventsource", eventHandler) ] |
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