73 lines
2.3 KiB
Haskell
73 lines
2.3 KiB
Haskell
-- | Compatibility layer for network package, including newtype 'PortID'
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{-# LANGUAGE CPP, GeneralizedNewtypeDeriving #-}
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module Database.MongoDB.Internal.Network (PortID(..), N.HostName, connectTo) where
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#if !MIN_VERSION_network(2, 9, 0)
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import qualified Network as N
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import System.IO (Handle)
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#else
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import Control.Exception (bracketOnError)
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import Network.BSD as BSD
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import qualified Network.Socket as N
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import System.IO (Handle, IOMode(ReadWriteMode))
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#endif
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-- | Wraps network's 'PortNumber'
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-- Used to ease compatibility between older and newer network versions.
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data PortID = PortNumber N.PortNumber
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#if !defined(mingw32_HOST_OS) && !defined(cygwin32_HOST_OS) && !defined(_WIN32)
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| UnixSocket String
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#endif
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deriving (Eq, Ord, Show)
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#if !MIN_VERSION_network(2, 9, 0)
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-- Unwrap our newtype and use network's PortID and connectTo
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connectTo :: N.HostName -- Hostname
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-> PortID -- Port Identifier
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-> IO Handle -- Connected Socket
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connectTo hostname (PortNumber port) = N.connectTo hostname (N.PortNumber port)
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#if !defined(mingw32_HOST_OS) && !defined(cygwin32_HOST_OS) && !defined(_WIN32)
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connectTo _ (UnixSocket path) = N.connectTo "" (N.UnixSocket path)
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#endif
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#else
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-- Copied implementation from network 2.8's 'connectTo', but using our 'PortID' newtype.
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-- https://github.com/haskell/network/blob/e73f0b96c9da924fe83f3c73488f7e69f712755f/Network.hs#L120-L129
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connectTo :: N.HostName -- Hostname
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-> PortID -- Port Identifier
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-> IO Handle -- Connected Socket
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connectTo hostname (PortNumber port) = do
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proto <- BSD.getProtocolNumber "tcp"
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bracketOnError
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(N.socket N.AF_INET N.Stream proto)
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(N.close) -- only done if there's an error
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(\sock -> do
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he <- BSD.getHostByName hostname
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N.connect sock (N.SockAddrInet port (hostAddress he))
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N.socketToHandle sock ReadWriteMode
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)
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#if !defined(mingw32_HOST_OS) && !defined(cygwin32_HOST_OS) && !defined(_WIN32)
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connectTo _ (UnixSocket path) = do
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bracketOnError
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(N.socket N.AF_UNIX N.Stream 0)
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(N.close)
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(\sock -> do
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N.connect sock (N.SockAddrUnix path)
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N.socketToHandle sock ReadWriteMode
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)
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#endif
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#endif
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