Handle error cases from the tracker

[functorrent.git] / src / Main.hs

diff --git a/src/Main.hs b/src/Main.hs
index 4af7af883e9f87d69fd1fd2f100691b2db39eaf8..77573313b61cc4d8c5a9da80a365321687aa64ca 100644 (file)
--- a/src/Main.hs
+++ b/src/Main.hs
@@ -1,3 +1,73 @@
+{-# LANGUAGE OverloadedStrings #-}
 module Main where
 
-main = putStrLn "hello"
+import Prelude hiding (length, readFile, writeFile)
+import Data.ByteString.Char8 (ByteString, readFile, writeFile, length, unpack)
+import System.Environment (getArgs)
+import System.Exit (exitSuccess)
+import System.Directory (doesFileExist)
+import Text.ParserCombinators.Parsec (ParseError)
+
+import FuncTorrent.Bencode (decode, BVal(..))
+import FuncTorrent.Logger (initLogger, logMessage, logStop)
+import FuncTorrent.Metainfo (announce, lengthInBytes, mkMetaInfo, info, name)
+import FuncTorrent.Peer (peers, mkPeerResp, handShakeMsg)
+import FuncTorrent.Tracker (connect, prepareRequest)
+
+logError :: ParseError -> (String -> IO ()) -> IO ()
+logError e logMsg = logMsg $ "parse error: \n" ++ show e
+
+peerId :: String
+peerId = "-HS0001-*-*-20150215"
+
+exit :: IO ByteString
+exit = exitSuccess
+
+usage :: IO ()
+usage = putStrLn "usage: functorrent torrent-file"
+
+parse :: [String] -> IO ByteString
+parse [] = usage >> exit
+parse [a] = do
+  fileExist <- doesFileExist a
+  if fileExist
+    then readFile a
+    else error "file does not exist"
+parse _ = exit
+
+main :: IO ()
+main = do
+    args <- getArgs
+    logR <- initLogger
+    let logMsg = logMessage logR
+    logMsg $ "Parsing input file: " ++ concat args
+    torrentStr <- parse args
+    case decode torrentStr of
+      Right d ->
+          case mkMetaInfo d of
+            Nothing -> logMsg "parse error"
+            Just m -> do
+              logMsg "Input File OK"
+
+              let len = lengthInBytes $ info m
+                  (Bdict d') = d
+
+              logMsg "Trying to fetch peers: "
+              response <- connect (announce m) (prepareRequest d' peerId len)
+
+              let hsMsgLen = show $ length $ handShakeMsg d' peerId
+              logMsg $ "Hand-shake message length : " ++ hsMsgLen
+
+              -- TODO: Write to ~/.functorrent/caches
+              writeFile (name (info m) ++ ".cache") response
+
+              case decode response of
+                Right trackerInfo ->
+                    case mkPeerResp trackerInfo of
+                      Right peerResp ->
+                          logMsg $ "Peers List : " ++ (show . peers $ peerResp)
+                      Left e -> logMsg $ "Error" ++ unpack e
+                Left e -> logError e logMsg
+
+      Left e -> logError e logMsg
+    logStop logR