1 files changed, 71 insertions, 0 deletions
diff --git a/datasources/serialparser.hs b/datasources/serialparser.hs
new file mode 100644
index 0000000..f2f6c09
--- /dev/null
+++ b/datasources/serialparser.hs
@@ -0,0 +1,71 @@
+{-# LANGUAGE OverloadedStrings #-}
+import Control.Applicative((<*))
+import Data.Attoparsec(Parser,takeWhile1)
+import Data.Attoparsec.Char8 (char8, endOfLine, isEndOfLine)
+import Data.Attoparsec.Enumerator(iterParser)
+import Data.Enumerator(Iteratee,Enumerator,run_,($$))
+import Data.Enumerator.Binary (enumHandle)
+import Data.ByteString.Char8(ByteString,unpack)
+import Network.HTTP(simpleHTTP)
+import Network.HTTP.Headers(Header,mkHeader,HeaderName(HdrContentLength))
+import Network.HTTP.Base(urlEncode,mkRequest,Request(..),RequestMethod(PUT))
+import Network.URI(parseURI)
+import System.Environment(getArgs)
+import System.Hardware.Serialport(hOpenSerial,defaultSerialSettings,commSpeed,CommSpeed(CS115200))
+import System.IO (Handle,hFlush,hPutStr,stdin,hWaitForInput)
+
+data Message = Measurement ByteString ByteString deriving (Show)
+
+parser :: Parser Message
+parser  = do
+  sensor <- takeWhile1 (/=61) <* char8 '='
+  value <- takeWhile1 (not . isEndOfLine) <* endOfLine
+  return $! Measurement sensor value
+
+parserIteratee       :: Handle -> Iteratee ByteString IO (Message)
+parserIteratee handle = stdinEnumerator $$ iteratee
+  where stdinEnumerator :: Enumerator ByteString IO b
+        stdinEnumerator = enumHandle 1 handle
+        iteratee :: Iteratee ByteString IO (Message)
+        iteratee = iterParser parser
+
+work     :: Handle -> IO ()
+work port = do (Measurement sensor value) <- run_ (parserIteratee port)
+               let url     = "http://localhost:8080/api/value/" ++ (urlEncode $ unpack sensor)
+                   request = putRequest url in
+                   simpleHTTP (putRequest url (unpack value))
+               putStrLn $ (unpack sensor) ++ "=" ++ (unpack value)
+
+loop     :: Handle -> IO ()
+loop port = do sendRequest
+               work port
+               work port
+               work port
+               loop port
+        where sendRequest :: IO (Bool)
+              sendRequest = do catch (hWaitForInput port 50) handler
+                               return (True)
+                          where handler e = do putStrLn "."
+                                               hPutStr port "0"
+                                               hFlush port
+                                               sendRequest
+
+main :: IO ()
+main  = do
+       args <- getArgs
+       port <- case args of
+            [path] -> hOpenSerial path defaultSerialSettings { commSpeed = CS115200 }
+            _ -> return stdin
+       loop port
+
+
+putRequest               :: String -> String -> Request String
+putRequest urlString body = 
+  case parseURI urlString of
+    Nothing -> error ("putRequest: Not a valid URL - " ++ urlString)
+    Just u  -> Request { rqURI      = u
+                       , rqBody     = body
+                       , rqHeaders  = headers
+                       , rqMethod   = PUT }
+        where headers = [ mkHeader HdrContentLength (show (length body) :: String) ]
+