Abstract bug description
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import Control.Concurrent.Async (mapConcurrently) | |
import Control.Exception.Enclosed (catchAny) | |
import qualified Network.Wreq as W | |
import System.Timeout (timeout) | |
someHandler :: Handler () | |
someHandler = do | |
-- we use single http-client's Manager | |
mgr <- _appWreqManager | |
candidates <- getCandidates | |
res <- liftIO $ fmap catMaybes $ mapConcurrently (fetch mgr) candidates | |
log "Got responses!" | |
renderResponses res | |
where | |
fetch :: Manager -> IO (Maybe CandidateData) | |
fetch mgr candidate = ctch $ tm $ do | |
log ("Provider: " <> show candidate) | |
case candidate of | |
CandidateProvider1 -> do | |
let opts = defaults & manager .~ (Right mgr) | |
r <- W.getWith opts "http://candidate1api.example.com/get-data" | |
log ("CandidateProvider1 responded with: " <> show r) | |
return (CandidateData1 r) | |
CandidateProvider2 -> do | |
log ("CandidateProvider2 doesn't need to fetch anything, returning pure value") | |
return CandidateData2 | |
tm f = do | |
res <- timeout (100000 * 5) f | |
case res of | |
Nothing -> do | |
logErr ("Got timeout while requesting " <> show candidate) | |
return Nothing | |
Just r -> return r | |
ctch f = catchAny f (\e -> logErr ("Exception while fetching " <> show candidate | |
<> ": " <> show e) | |
>> return ()) | |
data CandidateData | |
getCandidates = undefined | |
renderResponses = undefined |
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