Network.HTTP2.Internal

File

type FileOffset = Int64

Offset for file.

type ByteCount = Int64

How many bytes to read

type PositionRead = FileOffset -> ByteCount -> Buffer -> IO ByteCount

Position read for files.

data Sentinel

Manipulating a file resource.

Constructors

Closer (IO ())

Closing a file resource. Its refresher is automatiaclly generated by the internal timer.

Refresher (IO ())

Refreshing a file resource while reading. Closing the file must be done by its own timer or something.

type PositionReadMaker = FilePath -> IO (PositionRead, Sentinel)

Making a position read and its closer.

defaultPositionReadMaker :: PositionReadMaker

Position read based on Handle.

Types

type Scheme = ByteString

"http" or "https".

type Authority = ByteString

Authority.

type Path = ByteString

Path.

Request and response

data InpObj

Input object

Constructors

InpObj

Fields

• inpObjHeaders :: HeaderTable

  Accessor for headers.

• inpObjBodySize :: Maybe Int

  Accessor for body length specified in content-length:.

• inpObjBody :: InpBody

  Accessor for body.

• inpObjTrailers :: IORef (Maybe HeaderTable)

  Accessor for trailers.

Instances

Show InpObj

Defined in Network.HTTP2.Arch.Types

Methods

showsPrec :: Int -> InpObj -> ShowS

show :: InpObj -> String

showList :: [InpObj] -> ShowS

type InpBody = IO ByteString

data OutObj

Output object

Constructors

OutObj

Fields

• outObjHeaders :: [Header]

  Accessor for header.

• outObjBody :: OutBody

  Accessor for outObj body.

• outObjTrailers :: TrailersMaker

  Accessor for trailers maker.

Instances

Show OutObj

Defined in Network.HTTP2.Arch.Types

Methods

showsPrec :: Int -> OutObj -> ShowS

show :: OutObj -> String

showList :: [OutObj] -> ShowS

data OutBody

Constructors

OutBodyNone

OutBodyStreaming ((Builder -> IO ()) -> IO () -> IO ())

Streaming body takes a write action and a flush action.

OutBodyStreamingUnmask ((forall x. IO x -> IO x) -> (Builder -> IO ()) -> IO () -> IO ())

Like OutBodyStreaming, but with a callback to unmask expections

This is used in the client: we spawn the new thread for the request body with exceptions masked, and provide the body of OutBodyStreamingUnmask with a callback to unmask them again (typically after installing an exception handler).

We do NOT support this in the server, as here the scope of the thread that is spawned for the server is the entire handler, not just the response streaming body.

TODO: The analogous change for the server-side would be to provide a similar unmask callback as the first argument in the Server type alias.

OutBodyBuilder Builder

OutBodyFile FileSpec

data FileSpec

File specification.

Constructors

FileSpec FilePath FileOffset ByteCount

Instances

Show FileSpec

Defined in Network.HTTP2.Arch.Types

Methods

showsPrec :: Int -> FileSpec -> ShowS

show :: FileSpec -> String

showList :: [FileSpec] -> ShowS

Eq FileSpec

Defined in Network.HTTP2.Arch.Types

Methods

(==) :: FileSpec -> FileSpec -> Bool

(/=) :: FileSpec -> FileSpec -> Bool

Sender

data Next

Constructors

Next BytesFilled Bool (Maybe DynaNext)

type BytesFilled = Int

type DynaNext = Buffer -> BufferSize -> WindowSize -> IO Next

data StreamingChunk

Constructors

StreamingFinished (IO ())

StreamingFlush

StreamingBuilder Builder

fillBuilderBodyGetNext :: Builder -> DynaNext

fillFileBodyGetNext :: PositionRead -> FileOffset -> ByteCount -> IO () -> DynaNext

fillStreamBodyGetNext :: IO (Maybe StreamingChunk) -> DynaNext

Trailer

type TrailersMaker = Maybe ByteString -> IO NextTrailersMaker

Trailers maker. A chunks of the response body is passed with Just. The maker should update internal state with the ByteString and return the next trailers maker. When response body reaches its end, Nothing is passed and the maker should generate trailers. An example:

{-# LANGUAGE BangPatterns #-}
import Data.ByteString (ByteString)
import qualified Data.ByteString.Char8 as C8
import Crypto.Hash (Context, SHA1) -- cryptonite
import qualified Crypto.Hash as CH

-- Strictness is important for Context.
trailersMaker :: Context SHA1 -> Maybe ByteString -> IO NextTrailersMaker
trailersMaker ctx Nothing = return $ Trailers [("X-SHA1", sha1)]
  where
    !sha1 = C8.pack $ show $ CH.hashFinalize ctx
trailersMaker ctx (Just bs) = return $ NextTrailersMaker $ trailersMaker ctx'
  where
    !ctx' = CH.hashUpdate ctx bs

Usage example:

let h2rsp = responseFile ...
    maker = trailersMaker (CH.hashInit :: Context SHA1)
    h2rsp' = setResponseTrailersMaker h2rsp maker

defaultTrailersMaker :: TrailersMaker

TrailersMake to create no trailers.

data NextTrailersMaker

Either the next trailers maker or final trailers.

Constructors

NextTrailersMaker TrailersMaker

Trailers [Header]

runTrailersMaker :: TrailersMaker -> Buffer -> Int -> IO NextTrailersMaker

Running trailers-maker.

bufferIO buf siz $ \bs -> tlrmkr (Just bs)

Thread Manager

data Manager

Manager to manage the thread and the timer.

type Action = IO ()

Action to be spawned by the manager.

start :: Manager -> IO Manager

Starting a thread manager. Its action is initially set to 'return ()' and should be set by setAction. This allows that the action can include the manager itself.

setAction :: Manager -> Action -> IO ()

Setting the action to be spawned.

stopAfter :: Manager -> IO a -> (Either SomeException a -> IO b) -> IO b

Stopping the manager.

spawnAction :: Manager -> IO ()

Spawning the action.

forkManaged :: Manager -> IO () -> IO ()

Fork managed thread

This guarantees that the thread ID is added to the manager's queue before the thread starts, and is removed again when the thread terminates (normally or abnormally).

forkManagedUnmask :: Manager -> ((forall x. IO x -> IO x) -> IO ()) -> IO ()

Like forkManaged, but run action with exceptions masked

timeoutKillThread :: Manager -> (Handle -> IO a) -> IO a

Killing the IO action of the second argument on timeout.

timeoutClose :: Manager -> IO () -> IO (IO ())

Registering closer for a resource and returning a timer refresher.

data KilledByHttp2ThreadManager

Constructors

KilledByHttp2ThreadManager (Maybe SomeException)

Instances

Exception KilledByHttp2ThreadManager

Defined in Network.HTTP2.Arch.Manager

Methods

toException :: KilledByHttp2ThreadManager -> SomeException

fromException :: SomeException -> Maybe KilledByHttp2ThreadManager

displayException :: KilledByHttp2ThreadManager -> String

Show KilledByHttp2ThreadManager

Defined in Network.HTTP2.Arch.Manager

Methods

showsPrec :: Int -> KilledByHttp2ThreadManager -> ShowS

show :: KilledByHttp2ThreadManager -> String

showList :: [KilledByHttp2ThreadManager] -> ShowS

incCounter :: Manager -> IO ()

decCounter :: Manager -> IO ()

waitCounter0 :: Manager -> IO ()