From: Ramakrishnan Muthukrishnan <ram@rkrishnan.org>
Date: Fri, 18 Sep 2015 06:32:42 +0000 (+0530)
Subject: refactor doHandshake to use pattern matching
X-Git-Url: https://git.rkrishnan.org/pf/content/en/seg/biz//%22%22.?a=commitdiff_plain;h=36438aebae3f2785118b6b89d7c76791d487bd4d;p=functorrent.git

refactor doHandshake to use pattern matching
---

diff --git a/src/FuncTorrent/Peer.hs b/src/FuncTorrent/Peer.hs
index 2caf377..ed88e83 100644
--- a/src/FuncTorrent/Peer.hs
+++ b/src/FuncTorrent/Peer.hs
@@ -84,30 +84,28 @@ connectToPeer (Peer _ ip port) = do
   return h
 
 doHandshake :: Bool -> Handle -> Peer -> ByteString -> String -> IO ()
-doHandshake isClient h peer infoHash peerid =
+doHandshake True h peer infoHash peerid = do
   let hs = genHandshakeMsg infoHash peerid
-  in
-   if isClient
-   then do
-     hPut h hs
-     putStrLn $ "--> handhake to peer: " ++ show peer
-     _ <- hGet h (length (unpack hs))
-     putStrLn $ "<-- handshake from peer: " ++ show peer
-     return ()
-   else do
-     putStrLn $ "waiting for a handshake"
-     hsMsg <- hGet h (length (unpack hs))
-     putStrLn $ "<-- handshake from peer: " ++ show peer
-     let rxInfoHash = take 20 $ drop 28 hsMsg
-     if rxInfoHash /= infoHash
-       then do
-       putStrLn $ "infoHashes does not match"
-       hClose h
-       return ()
-       else do
-       _ <- hPut h hs
-       putStrLn $ "--> handhake to peer: " ++ show peer
-       return ()
+  hPut h hs
+  putStrLn $ "--> handhake to peer: " ++ show peer
+  _ <- hGet h (length (unpack hs))
+  putStrLn $ "<-- handshake from peer: " ++ show peer
+  return ()
+doHandshake False h peer infoHash peerid = do
+  let hs = genHandshakeMsg infoHash peerid
+  putStrLn $ "waiting for a handshake"
+  hsMsg <- hGet h (length (unpack hs))
+  putStrLn $ "<-- handshake from peer: " ++ show peer
+  let rxInfoHash = take 20 $ drop 28 hsMsg
+  if rxInfoHash /= infoHash
+    then do
+    putStrLn $ "infoHashes does not match"
+    hClose h
+    return ()
+    else do
+    _ <- hPut h hs
+    putStrLn $ "--> handhake to peer: " ++ show peer
+    return ()
 
 bitfieldToList :: [Word8] -> [Integer]
 bitfieldToList bs = go bs 0