/
HTTP.hs
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/
HTTP.hs
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{-# LANGUAGE BangPatterns #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE RankNTypes #-}
{-# LANGUAGE RecordWildCards #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE ViewPatterns #-}
{-# LANGUAGE CPP #-} -- b/w compat for http-client < 2.3.0
-- |
-- Module : Network.AWS.Internal.HTTP
-- Copyright : (c) 2013-2018 Brendan Hay
-- License : Mozilla Public License, v. 2.0.
-- Maintainer : Brendan Hay <brendan.g.hay+amazonka@gmail.com>
-- Stability : provisional
-- Portability : non-portable (GHC extensions)
--
module Network.AWS.Internal.HTTP
( retrier
, waiter
) where
import Control.Arrow (first)
import Control.Monad
import Control.Monad.Catch (MonadThrow, MonadCatch, Handler(Handler), catches)
import Control.Monad.IO.Class
import Control.Monad.Reader
import Control.Monad.Trans.Resource
import Control.Retry
import Data.List (intersperse)
import Data.Monoid
import Data.Proxy
import Data.Time
import Network.AWS.Env
import Network.AWS.Internal.Logger
import Network.AWS.Lens ((%~), (&), (^.), (^?))
import Network.AWS.Lens (to, view, _Just)
import Network.AWS.Prelude
import Network.AWS.Waiter
import Network.HTTP.Conduit hiding (Proxy, Request, Response)
#if MIN_VERSION_http_conduit(2, 3, 0)
#else
import Data.Conduit (unwrapResumable, addCleanup)
#endif
retrier :: ( MonadThrow m
, MonadCatch m
, MonadResource m
, MonadReader r m
, HasEnv r
, AWSRequest a
)
=> a
-> m (Either Error (Response a))
retrier x = do
e <- view environment
rq <- configured x
retrying (policy rq) (check e rq) (\_ -> perform e rq)
where
policy rq = retryStream rq <> retryService (_rqService rq)
check e rq s (Left r)
| Just p <- r ^? transportErr, p = msg e "http_error" s >> return True
| Just m <- r ^? serviceErr = msg e m s >> return True
where
transportErr = _TransportError . to (_envRetryCheck e (rsIterNumber s))
serviceErr = _ServiceError . to rc . _Just
rc = rq ^. rqService . serviceRetry . retryCheck
check _ _ _ _ = return False
msg :: MonadIO m => Env -> Text -> RetryStatus -> m ()
msg e m s = logDebug (_envLogger e)
. mconcat
. intersperse " "
$ [ "[Retry " <> build m <> "]"
, "after"
, build (rsIterNumber s + 1)
, "attempts."
]
waiter :: ( MonadThrow m
, MonadCatch m
, MonadResource m
, MonadReader r m
, HasEnv r
, AWSRequest a
)
=> Wait a
-> a
-> m (Either Error Accept)
waiter w@Wait{..} x = do
e@Env{..} <- view environment
rq <- configured x
retrying policy (check _envLogger) (\_ -> result rq <$> perform e rq) >>= exit
where
policy = limitRetries _waitAttempts
<> constantDelay (microseconds _waitDelay)
check e n (a, _) = msg e n a >> return (retry a)
where
retry AcceptSuccess = False
retry AcceptFailure = False
retry AcceptRetry = True
result rq = first (fromMaybe AcceptRetry . accept w rq) . join (,)
exit (AcceptSuccess, _) = return (Right AcceptSuccess)
exit (_, Left e) = return (Left e)
exit (a, _) = return (Right a)
msg l s a = logDebug l
. mconcat
. intersperse " "
$ [ "[Await " <> build _waitName <> "]"
, build a
, "after"
, build (rsIterNumber s + 1)
, "attempts."
]
-- | The 'Service' is configured + unwrapped at this point.
perform :: ( MonadThrow m
, MonadCatch m
, MonadResource m
, AWSRequest a
)
=> Env
-> Request a
-> m (Either Error (Response a))
perform Env{..} x = catches go handlers
where
go = do
t <- liftIO getCurrentTime
Signed m rq <-
withAuth _envAuth $ \a ->
return $! rqSign x a _envRegion t
logTrace _envLogger m -- trace:Signing:Meta
logDebug _envLogger rq -- debug:ClientRequest
#if MIN_VERSION_http_conduit(2, 3, 0)
rs <- liftResourceT (http rq _envManager)
#else
rs' <- liftResourceT (http rq _envManager)
let resSrc = responseBody rs'
(src', fin) <- liftResourceT (unwrapResumable resSrc)
let src = addCleanup (const fin) src'
let rs = src <$ rs'
#endif
logDebug _envLogger rs -- debug:ClientResponse
Right <$> response _envLogger (_rqService x) (p x) rs
handlers =
[ Handler $ err
, Handler $ err . TransportError
]
where
err e = logError _envLogger e >> return (Left e)
p :: Request a -> Proxy a
p = const Proxy
configured :: (MonadReader r m, HasEnv r, AWSRequest a)
=> a
-> m (Request a)
configured (request -> x) = do
o <- view envOverride
return $! x & rqService %~ appEndo (getDual o)
retryStream :: Request a -> RetryPolicy
retryStream x = RetryPolicyM (\_ -> return (listToMaybe [0 | not p]))
where
!p = isStreaming (_rqBody x)
retryService :: Service -> RetryPolicy
retryService s = limitRetries _retryAttempts <> RetryPolicyM (return . delay)
where
delay (rsIterNumber -> n)
| n >= 0 = Just $ truncate (grow * 1000000)
| otherwise = Nothing
where
grow = _retryBase * (fromIntegral _retryGrowth ^^ (n - 1))
Exponential{..} = _svcRetry s