Find out whether the weather monitor is likely to block

Uses the HTTP module to do the work rather than curl.

3 files changed, 23 insertions, 3 deletions

diff --git a/src/Plugins/Monitors.hs b/src/Plugins/Monitors.hs
index baeb615..27db417 100644
--- a/src/Plugins/Monitors.hs
+++ b/src/Plugins/Monitors.hs
@@ -19,7 +19,7 @@ module Plugins.Monitors where
 
 import Plugins
 
-import Plugins.Monitors.Common (runM)
+import Plugins.Monitors.Common (runM, runMD)
 import Plugins.Monitors.Weather
 import Plugins.Monitors.Net
 import Plugins.Monitors.Mem
@@ -40,7 +40,7 @@ import Plugins.Monitors.Wireless
 #endif
 #ifdef LIBMPD
 import Plugins.Monitors.MPD
-import Plugins.Monitors.Common (runMD, runMBD)
+import Plugins.Monitors.Common (runMBD)
 #endif
 #ifdef ALSA
 import Plugins.Monitors.Volume
@@ -136,7 +136,7 @@ instance Exec Monitors where
     start (MultiCpu a r) = startMultiCpu a r
     start (TopProc a r) = startTop a r
     start (TopMem a r) = runM a topMemConfig runTopMem r
-    start (Weather s a r) = runM (a ++ [s]) weatherConfig runWeather r
+    start (Weather s a r) = runMD (a ++ [s]) weatherConfig runWeather r weatherReady
     start (Thermal z a r) = runM (a ++ [z]) thermalConfig runThermal r
     start (ThermalZone z a r) =
       runM (a ++ [show z]) thermalZoneConfig runThermalZone r
diff --git a/src/Plugins/Monitors/Weather.hs b/src/Plugins/Monitors/Weather.hs
index bb3d5da..a008453 100644
--- a/src/Plugins/Monitors/Weather.hs
+++ b/src/Plugins/Monitors/Weather.hs
@@ -20,6 +20,7 @@ import Control.Monad (when)
 import System.Process
 import System.Exit
 import System.IO
+import Network.HTTP
 
 import Text.ParserCombinators.Parsec
 
@@ -129,6 +130,9 @@ parseData =
 defUrl :: String
 defUrl = "http://weather.noaa.gov/pub/data/observations/metar/decoded/"
 
+stationUrl :: String -> String
+stationUrl station = defUrl ++ station ++ ".TXT"
+
 getData :: String -> IO String
 getData url=
         do (i,o,e,p) <- runInteractiveCommand ("curl " ++ defUrl ++ url ++ ".TXT")
@@ -156,3 +160,18 @@ runWeather str =
     do d <- io $ getData $ head str
        i <- io $ runP parseData d
        formatWeather i
+
+weatherReady :: [String] -> Monitor Bool
+weatherReady str = do
+    let station = head str
+        request = headRequest (stationUrl station)
+    result <- io $ simpleHTTP request
+    case result of
+        Left _ -> return False
+        Right response -> do
+            case rspCode response of
+                -- Permission or network errors are failures; anything else is
+                -- recoverable.
+                (4, _, _) -> return False
+                (5, _, _) -> return False
+                (_, _, _) -> return True
diff --git a/xmobar.cabal b/xmobar.cabal
index 39aa0dc..9a26c5d 100644
--- a/xmobar.cabal
+++ b/xmobar.cabal
@@ -108,6 +108,7 @@ executable xmobar
       X11 >= 1.6.1,
       mtl >= 2.0 && < 2.2,
       parsec == 3.1.*,
+      HTTP >= 4000,
       stm >= 2.3 && < 2.5
 
     if flag(with_threaded)