1 {-# LANGUAGE BangPatterns #-}
2 {-# LANGUAGE DoAndIfThenElse #-}
7 import Control.Concurrent (threadDelay)
8 import Control.DeepSeq (deepseq)
9 import Control.Exception.Base (bracket)
10 import Control.Monad (forever, when)
11 import Data.List (isPrefixOf)
12 import Data.Maybe (isNothing)
13 import Data.Monoid ((<>))
17 import System.Console.CmdArgs (def)
18 import System.Directory (doesFileExist)
19 import System.Exit (ExitCode(..), exitWith)
20 import System.FilePath ((</>))
22 BufferMode (NoBuffering),
31 import System.IO.Error (catchIOError)
33 import CommandLine (get_args)
34 import Configuration (Configuration(..), merge_optional)
39 import FeedHosts (FeedHosts(..))
40 import qualified OptionalConfiguration as OC (
41 OptionalConfiguration(..),
43 import Terminal (hPutRedLn, putGreenLn)
44 import TSN.Xml (parse_xmlfid, xml_prologue)
47 report_error :: String -> IO ()
48 report_error = hPutRedLn stderr
51 recv_line :: Handle -> IO String
58 save_document :: Configuration -> String -> IO ()
59 save_document cfg doc = do
62 report_error "ERROR: document missing XML_File_ID element."
64 already_exists <- doesFileExist path
65 when already_exists $ do
66 let msg = "WARNING: file " ++ path ++ " already exists. Overwriting."
70 xmlfid = fmap show (parse_xmlfid doc)
71 filename = fmap (++ ".xml") xmlfid
72 maybe_path = fmap ((output_directory cfg) </>) filename
74 -- | Loop forever, writing the buffer to file whenever a new XML
76 loop :: Configuration -> Handle -> [String] -> IO ()
77 loop !cfg !h !buffer = do
80 if (xml_prologue `isPrefixOf` line && not (null buffer))
82 -- This is the beginning of a new document, and we have an "old"
83 -- one to save. The buffer is in reverse (newest first) order,
84 -- though, so we have to reverse it first. We then concatenate all
85 -- of its lines into one big string.
86 let document = concat $ reverse buffer
87 save_document cfg document
88 loop cfg h [line] -- empty the buffer before looping again
90 loop cfg h (line : buffer) -- append line to the head of the buffer and loop
93 log_in :: Configuration -> Handle -> IO ()
95 prompt1 <- recv_prompt h
97 if prompt1 /= username_prompt then
98 report_error "ERROR: didn't receive username prompt."
100 send_line h (username cfg)
101 prompt2 <- recv_prompt h
103 if prompt2 /= password_prompt then
104 report_error "ERROR: didn't receive password prompt."
106 send_line h (password cfg)
107 banner <- recv_line h -- "The Sports Network"
108 banner `deepseq` return ()
110 username_prompt = "Username: "
111 password_prompt = "Password: "
113 send_line :: Handle -> String -> IO ()
115 hPutStr h' (s ++ "\r\n")
118 recv_chars :: Int -> Handle -> IO String
120 s <- sequence [ hGetChar h' | _ <- [1..n] ]
124 recv_prompt :: Handle -> IO String
125 recv_prompt = recv_chars 10
127 connect_and_loop :: Configuration -> IO ()
128 connect_and_loop cfg =
129 bracket acquire_handle release_handle action
131 --acquire_handle = connectTo "feed1.sportsnetwork.com" (PortNumber 4500)
132 acquire_handle = connectTo "feed2.sportsnetwork.com" (PortNumber 4500)
133 --acquire_handle = connectTo "127.0.0.1" (PortNumber 13337)
134 release_handle = hClose
136 -- No buffering anywhere.
137 hSetBuffering h NoBuffering
142 -- | A wrapper around threadDelay which takes seconds instead of
143 -- microseconds as its argument.
144 thread_sleep :: Int -> IO ()
145 thread_sleep seconds = do
146 let microseconds = seconds * (10 ^ (6 :: Int))
147 threadDelay microseconds
155 -- Merge the config file options with the command-line ones,
156 -- prefering the command-line ones.
157 let opt_config = rc_cfg <> cmd_cfg
159 when (null $ get_feed_hosts (OC.feed_hosts opt_config)) $ do
160 report_error "ERROR: no feed hosts supplied."
161 exitWith (ExitFailure exit_no_feed_hosts)
163 when (isNothing (OC.password opt_config)) $ do
164 report_error "ERROR: no password supplied."
165 exitWith (ExitFailure exit_no_password)
167 when (isNothing (OC.username opt_config)) $ do
168 report_error "ERROR: no username supplied."
169 exitWith (ExitFailure exit_no_username)
171 -- Finally, update a default config with any options that have been
172 -- set in either the config file or on the command-line.
173 let cfg = (def :: Configuration) `merge_optional` opt_config
175 hSetBuffering stderr NoBuffering
176 hSetBuffering stdout NoBuffering
179 catchIOError (connect_and_loop cfg) (report_error . show)
180 thread_sleep 10 -- Wait 10s before attempting to reconnect.