diff --git a/LICENSE b/LICENSE new file mode 100644 --- /dev/null +++ b/LICENSE @@ -0,0 +1,373 @@ +Mozilla Public License Version 2.0 +================================== + +1. Definitions +-------------- + +1.1. "Contributor" + means each individual or legal entity that creates, contributes to + the creation of, or owns Covered Software. + +1.2. "Contributor Version" + means the combination of the Contributions of others (if any) used + by a Contributor and that particular Contributor's Contribution. + +1.3. "Contribution" + means Covered Software of a particular Contributor. + +1.4. "Covered Software" + means Source Code Form to which the initial Contributor has attached + the notice in Exhibit A, the Executable Form of such Source Code + Form, and Modifications of such Source Code Form, in each case + including portions thereof. + +1.5. "Incompatible With Secondary Licenses" + means + + (a) that the initial Contributor has attached the notice described + in Exhibit B to the Covered Software; or + + (b) that the Covered Software was made available under the terms of + version 1.1 or earlier of the License, but not also under the + terms of a Secondary License. + +1.6. "Executable Form" + means any form of the work other than Source Code Form. + +1.7. "Larger Work" + means a work that combines Covered Software with other material, in + a separate file or files, that is not Covered Software. + +1.8. "License" + means this document. + +1.9. "Licensable" + means having the right to grant, to the maximum extent possible, + whether at the time of the initial grant or subsequently, any and + all of the rights conveyed by this License. + +1.10. "Modifications" + means any of the following: + + (a) any file in Source Code Form that results from an addition to, + deletion from, or modification of the contents of Covered + Software; or + + (b) any new file in Source Code Form that contains any Covered + Software. + +1.11. "Patent Claims" of a Contributor + means any patent claim(s), including without limitation, method, + process, and apparatus claims, in any patent Licensable by such + Contributor that would be infringed, but for the grant of the + License, by the making, using, selling, offering for sale, having + made, import, or transfer of either its Contributions or its + Contributor Version. + +1.12. "Secondary License" + means either the GNU General Public License, Version 2.0, the GNU + Lesser General Public License, Version 2.1, the GNU Affero General + Public License, Version 3.0, or any later versions of those + licenses. + +1.13. "Source Code Form" + means the form of the work preferred for making modifications. + +1.14. "You" (or "Your") + means an individual or a legal entity exercising rights under this + License. For legal entities, "You" includes any entity that + controls, is controlled by, or is under common control with You. For + purposes of this definition, "control" means (a) the power, direct + or indirect, to cause the direction or management of such entity, + whether by contract or otherwise, or (b) ownership of more than + fifty percent (50%) of the outstanding shares or beneficial + ownership of such entity. + +2. License Grants and Conditions +-------------------------------- + +2.1. Grants + +Each Contributor hereby grants You a world-wide, royalty-free, +non-exclusive license: + +(a) under intellectual property rights (other than patent or trademark) + Licensable by such Contributor to use, reproduce, make available, + modify, display, perform, distribute, and otherwise exploit its + Contributions, either on an unmodified basis, with Modifications, or + as part of a Larger Work; and + +(b) under Patent Claims of such Contributor to make, use, sell, offer + for sale, have made, import, and otherwise transfer either its + Contributions or its Contributor Version. + +2.2. Effective Date + +The licenses granted in Section 2.1 with respect to any Contribution +become effective for each Contribution on the date the Contributor first +distributes such Contribution. + +2.3. Limitations on Grant Scope + +The licenses granted in this Section 2 are the only rights granted under +this License. No additional rights or licenses will be implied from the +distribution or licensing of Covered Software under this License. +Notwithstanding Section 2.1(b) above, no patent license is granted by a +Contributor: + +(a) for any code that a Contributor has removed from Covered Software; + or + +(b) for infringements caused by: (i) Your and any other third party's + modifications of Covered Software, or (ii) the combination of its + Contributions with other software (except as part of its Contributor + Version); or + +(c) under Patent Claims infringed by Covered Software in the absence of + its Contributions. + +This License does not grant any rights in the trademarks, service marks, +or logos of any Contributor (except as may be necessary to comply with +the notice requirements in Section 3.4). + +2.4. Subsequent Licenses + +No Contributor makes additional grants as a result of Your choice to +distribute the Covered Software under a subsequent version of this +License (see Section 10.2) or under the terms of a Secondary License (if +permitted under the terms of Section 3.3). + +2.5. Representation + +Each Contributor represents that the Contributor believes its +Contributions are its original creation(s) or it has sufficient rights +to grant the rights to its Contributions conveyed by this License. + +2.6. Fair Use + +This License is not intended to limit any rights You have under +applicable copyright doctrines of fair use, fair dealing, or other +equivalents. + +2.7. Conditions + +Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted +in Section 2.1. + +3. Responsibilities +------------------- + +3.1. Distribution of Source Form + +All distribution of Covered Software in Source Code Form, including any +Modifications that You create or to which You contribute, must be under +the terms of this License. You must inform recipients that the Source +Code Form of the Covered Software is governed by the terms of this +License, and how they can obtain a copy of this License. You may not +attempt to alter or restrict the recipients' rights in the Source Code +Form. + +3.2. Distribution of Executable Form + +If You distribute Covered Software in Executable Form then: + +(a) such Covered Software must also be made available in Source Code + Form, as described in Section 3.1, and You must inform recipients of + the Executable Form how they can obtain a copy of such Source Code + Form by reasonable means in a timely manner, at a charge no more + than the cost of distribution to the recipient; and + +(b) You may distribute such Executable Form under the terms of this + License, or sublicense it under different terms, provided that the + license for the Executable Form does not attempt to limit or alter + the recipients' rights in the Source Code Form under this License. + +3.3. Distribution of a Larger Work + +You may create and distribute a Larger Work under terms of Your choice, +provided that You also comply with the requirements of this License for +the Covered Software. If the Larger Work is a combination of Covered +Software with a work governed by one or more Secondary Licenses, and the +Covered Software is not Incompatible With Secondary Licenses, this +License permits You to additionally distribute such Covered Software +under the terms of such Secondary License(s), so that the recipient of +the Larger Work may, at their option, further distribute the Covered +Software under the terms of either this License or such Secondary +License(s). + +3.4. Notices + +You may not remove or alter the substance of any license notices +(including copyright notices, patent notices, disclaimers of warranty, +or limitations of liability) contained within the Source Code Form of +the Covered Software, except that You may alter any license notices to +the extent required to remedy known factual inaccuracies. + +3.5. Application of Additional Terms + +You may choose to offer, and to charge a fee for, warranty, support, +indemnity or liability obligations to one or more recipients of Covered +Software. However, You may do so only on Your own behalf, and not on +behalf of any Contributor. You must make it absolutely clear that any +such warranty, support, indemnity, or liability obligation is offered by +You alone, and You hereby agree to indemnify every Contributor for any +liability incurred by such Contributor as a result of warranty, support, +indemnity or liability terms You offer. You may include additional +disclaimers of warranty and limitations of liability specific to any +jurisdiction. + +4. Inability to Comply Due to Statute or Regulation +--------------------------------------------------- + +If it is impossible for You to comply with any of the terms of this +License with respect to some or all of the Covered Software due to +statute, judicial order, or regulation then You must: (a) comply with +the terms of this License to the maximum extent possible; and (b) +describe the limitations and the code they affect. Such description must +be placed in a text file included with all distributions of the Covered +Software under this License. Except to the extent prohibited by statute +or regulation, such description must be sufficiently detailed for a +recipient of ordinary skill to be able to understand it. + +5. Termination +-------------- + +5.1. The rights granted under this License will terminate automatically +if You fail to comply with any of its terms. However, if You become +compliant, then the rights granted under this License from a particular +Contributor are reinstated (a) provisionally, unless and until such +Contributor explicitly and finally terminates Your grants, and (b) on an +ongoing basis, if such Contributor fails to notify You of the +non-compliance by some reasonable means prior to 60 days after You have +come back into compliance. Moreover, Your grants from a particular +Contributor are reinstated on an ongoing basis if such Contributor +notifies You of the non-compliance by some reasonable means, this is the +first time You have received notice of non-compliance with this License +from such Contributor, and You become compliant prior to 30 days after +Your receipt of the notice. + +5.2. If You initiate litigation against any entity by asserting a patent +infringement claim (excluding declaratory judgment actions, +counter-claims, and cross-claims) alleging that a Contributor Version +directly or indirectly infringes any patent, then the rights granted to +You by any and all Contributors for the Covered Software under Section +2.1 of this License shall terminate. + +5.3. In the event of termination under Sections 5.1 or 5.2 above, all +end user license agreements (excluding distributors and resellers) which +have been validly granted by You or Your distributors under this License +prior to termination shall survive termination. + +************************************************************************ +* * +* 6. Disclaimer of Warranty * +* ------------------------- * +* * +* Covered Software is provided under this License on an "as is" * +* basis, without warranty of any kind, either expressed, implied, or * +* statutory, including, without limitation, warranties that the * +* Covered Software is free of defects, merchantable, fit for a * +* particular purpose or non-infringing. The entire risk as to the * +* quality and performance of the Covered Software is with You. * +* Should any Covered Software prove defective in any respect, You * +* (not any Contributor) assume the cost of any necessary servicing, * +* repair, or correction. This disclaimer of warranty constitutes an * +* essential part of this License. No use of any Covered Software is * +* authorized under this License except under this disclaimer. * +* * +************************************************************************ + +************************************************************************ +* * +* 7. Limitation of Liability * +* -------------------------- * +* * +* Under no circumstances and under no legal theory, whether tort * +* (including negligence), contract, or otherwise, shall any * +* Contributor, or anyone who distributes Covered Software as * +* permitted above, be liable to You for any direct, indirect, * +* special, incidental, or consequential damages of any character * +* including, without limitation, damages for lost profits, loss of * +* goodwill, work stoppage, computer failure or malfunction, or any * +* and all other commercial damages or losses, even if such party * +* shall have been informed of the possibility of such damages. This * +* limitation of liability shall not apply to liability for death or * +* personal injury resulting from such party's negligence to the * +* extent applicable law prohibits such limitation. Some * +* jurisdictions do not allow the exclusion or limitation of * +* incidental or consequential damages, so this exclusion and * +* limitation may not apply to You. * +* * +************************************************************************ + +8. Litigation +------------- + +Any litigation relating to this License may be brought only in the +courts of a jurisdiction where the defendant maintains its principal +place of business and such litigation shall be governed by laws of that +jurisdiction, without reference to its conflict-of-law provisions. +Nothing in this Section shall prevent a party's ability to bring +cross-claims or counter-claims. + +9. Miscellaneous +---------------- + +This License represents the complete agreement concerning the subject +matter hereof. If any provision of this License is held to be +unenforceable, such provision shall be reformed only to the extent +necessary to make it enforceable. Any law or regulation which provides +that the language of a contract shall be construed against the drafter +shall not be used to construe this License against a Contributor. + +10. Versions of the License +--------------------------- + +10.1. New Versions + +Mozilla Foundation is the license steward. Except as provided in Section +10.3, no one other than the license steward has the right to modify or +publish new versions of this License. Each version will be given a +distinguishing version number. + +10.2. Effect of New Versions + +You may distribute the Covered Software under the terms of the version +of the License under which You originally received the Covered Software, +or under the terms of any subsequent version published by the license +steward. + +10.3. Modified Versions + +If you create software not governed by this License, and you want to +create a new license for such software, you may create and use a +modified version of this License if you rename the license and remove +any references to the name of the license steward (except to note that +such modified license differs from this License). + +10.4. Distributing Source Code Form that is Incompatible With Secondary +Licenses + +If You choose to distribute Source Code Form that is Incompatible With +Secondary Licenses under the terms of this version of the License, the +notice described in Exhibit B of this License must be attached. + +Exhibit A - Source Code Form License Notice +------------------------------------------- + + This Source Code Form is subject to the terms of the Mozilla Public + License, v. 2.0. If a copy of the MPL was not distributed with this + file, You can obtain one at http://mozilla.org/MPL/2.0/. + +If it is not possible or desirable to put the notice in a particular +file, then You may include the notice in a location (such as a LICENSE +file in a relevant directory) where a recipient would be likely to look +for such a notice. + +You may add additional accurate notices of copyright ownership. + +Exhibit B - "Incompatible With Secondary Licenses" Notice +--------------------------------------------------------- + + This Source Code Form is "Incompatible With Secondary Licenses", as + defined by the Mozilla Public License, v. 2.0. diff --git a/Setup.hs b/Setup.hs new file mode 100644 --- /dev/null +++ b/Setup.hs @@ -0,0 +1,2 @@ +import Distribution.Simple +main = defaultMain diff --git a/eager-sockets.cabal b/eager-sockets.cabal new file mode 100644 --- /dev/null +++ b/eager-sockets.cabal @@ -0,0 +1,33 @@ +name: eager-sockets +version: 0.1 +synopsis: Socket operations with timeouts +stability: experimental +license: OtherLicense +license-file: LICENSE +author: Toralf Wittner +maintainer: Toralf Wittner +copyright: (c) 2014 Toralf Wittner +category: Network +build-type: Simple +cabal-version: >= 1.10 + +description: + Socket operations such as connect\/receive\/send with timeouts. + +source-repository head + type: git + location: git@github.com:twittner/eager-sockets.git + +library + default-language: Haskell2010 + hs-source-dirs: src + ghc-options: -Wall -O2 -fwarn-tabs + + exposed-modules: + Network.Socket.Eager + + build-depends: + base >= 4.6 && < 4.8 + , bytestring >= 0.10.2 && < 0.11 + , network >= 2.4 && < 2.6 + diff --git a/src/Network/Socket/Eager.hsc b/src/Network/Socket/Eager.hsc new file mode 100644 --- /dev/null +++ b/src/Network/Socket/Eager.hsc @@ -0,0 +1,179 @@ +-- This Source Code Form is subject to the terms of the Mozilla Public +-- License, v. 2.0. If a copy of the MPL was not distributed with this +-- file, You can obtain one at http://mozilla.org/MPL/2.0/. + +{-# LANGUAGE BangPatterns #-} +{-# LANGUAGE CPP #-} +{-# LANGUAGE DeriveDataTypeable #-} +{-# LANGUAGE MultiWayIf #-} +{-# LANGUAGE OverloadedStrings #-} + +-- | This module exports some basic functions to wait for some given +-- milliseconds on 'Socket's to become available for reading or writing. +-- +-- On top some higher-level functions to 'connect', 'send' and 'recv' +-- with timeouts are provided. +-- +-- The implementation is Unix-only and uses GHC-specific functionality +-- from "GHC.IO.Device" and "GHC.IO.FD". In particular, the basic wait +-- functions are just exports of 'GHC.IO.Device.ready'. +module Network.Socket.Eager + ( Error (..) + , Milliseconds (..) + , Descriptor + , descriptor + , connect + , connect' + , send + , send' + , recv + , recv' + + -- * basic wait functions + , waitRead + , waitRead' + , waitWrite + , waitWrite' + ) where + +import Control.Applicative +import Control.Exception +import Control.Monad +import Data.ByteString.Builder +import Data.ByteString.Lazy (ByteString) +import Data.Monoid +import Data.Typeable +import Foreign +import Foreign.C +import GHC.IO.FD +import Network +import Network.Socket hiding (connect, recv, send) +import Network.Socket.Internal (withSockAddr) + +import qualified Data.ByteString.Lazy as B +import qualified Data.ByteString as BS +import qualified Network.Socket.ByteString as NS +import qualified Network.Socket.ByteString.Lazy as N +import qualified GHC.IO.Device as IODevice + +data Error + = ConnectTimeout + | RecvTimeout + | SendTimeout + | ConnectError + | ConnectionClosed + deriving (Eq, Show, Typeable) + +instance Exception Error + +newtype Milliseconds = Milliseconds { ms :: Int } + +-- | A @Descriptor@ encapsulates an @GHC.IO.FD.FD@ +-- Most of the wait functions operate on this descriptor which +-- is implicitly created in functions which only accept a +-- 'Socket' as parameter. +newtype Descriptor = Descriptor { fd :: FD } + +descriptor :: Socket -> Descriptor +descriptor s = Descriptor $ FD (fdSocket s) 1 + +waitRead :: Milliseconds -> Socket -> IO Bool +waitRead t s = waitRead' t (descriptor s) +{-# INLINEABLE waitRead #-} + +waitRead' :: Milliseconds -> Descriptor -> IO Bool +waitRead' t s = IODevice.ready (fd s) False (ms t) +{-# INLINEABLE waitRead' #-} + +waitWrite :: Milliseconds -> Socket -> IO Bool +waitWrite t s = waitWrite' t (descriptor s) +{-# INLINEABLE waitWrite #-} + +waitWrite' :: Milliseconds -> Descriptor -> IO Bool +waitWrite' t s = IODevice.ready (fd s) True (ms t) +{-# INLINEABLE waitWrite' #-} + +connect :: Milliseconds -> SockAddr -> Socket -> IO () +connect t a s = connect' t a (descriptor s) + +connect' :: Milliseconds -> SockAddr -> Descriptor -> IO () +connect' t a d = withSockAddr a loop + where + loop ptr sz = do + r <- c_connect (fdFD (fd d)) ptr (fromIntegral sz) + if r == -1 + then do + e <- getErrno + if | e == eINTR -> loop ptr sz + | e == eINPROGRESS -> wait + | otherwise -> throwIO ConnectError + else return () + + wait = do + isReady <- waitWrite' t d + unless isReady $ + throwIO ConnectTimeout + e <- socketError d + when (e /= 0) $ + throwIO ConnectError + +send :: Milliseconds -> ByteString -> Socket -> IO () +send t bs s = send' t bs (descriptor s) s + +send' :: Milliseconds -> ByteString -> Descriptor -> Socket -> IO () +send' _ "" _ _ = return () +send' t !b d s = do + isReady <- waitWrite' t d + unless isReady $ + throwIO SendTimeout + n <- N.send s b + send' t (B.drop n b) d s + +recv :: Milliseconds -> Int -> Socket -> IO ByteString +recv t n s = recv' t n (descriptor s) s + +recv' :: Milliseconds -> Int -> Descriptor -> Socket -> IO ByteString +recv' _ 0 _ _ = return B.empty +recv' t n d s = toLazyByteString <$> go 0 mempty + where + go k bytes = do + isReady <- waitRead' t d + unless isReady $ + throwIO RecvTimeout + a <- NS.recv s (n - k) + if BS.null a + then throwIO ConnectionClosed + else let b = bytes <> byteString a + m = BS.length a + k + in if m < n then go m b else return b + +----------------------------------------------------------------------------- +-- Internal: + +#include + +socketError :: Descriptor -> IO CInt +socketError d = + with (fromIntegral $ sizeOf (undefined :: CInt)) $ \plen -> + with 0 $ \pval -> do + throwErrnoIfMinus1Retry_ "getsockopt" $ + c_getsockopt (fdFD (fd d)) sockLevel sockError pval plen + peek pval + +sockLevel :: CInt +sockLevel = #const SOL_SOCKET + +sockError :: CInt +sockError = #const SO_ERROR + +foreign import ccall unsafe "connect" + c_connect :: CInt -> Ptr SockAddr -> CInt -> IO CInt + +foreign import ccall unsafe "getsockopt" + c_getsockopt :: CInt -- socket + -> CInt -- protocol level + -> CInt -- name + -> Ptr CInt -- value + -> Ptr CInt -- length + -> IO CInt +