http2-3.0.3: HTTP/2 library
Safe Haskell None
Language Haskell2010

Network.HTTP2.Client

Description

HTTP/2 client library.

Example:

{-# LANGUAGE OverloadedStrings #-}
module Main where

import qualified Control.Exception as E
import Control.Concurrent (forkIO, threadDelay)
import qualified Data.ByteString.Char8 as C8
import Network.HTTP.Types
import Network.Run.TCP (runTCPClient) -- network-run

import Network.HTTP2.Client

serverName :: String
serverName = "127.0.0.1"

main :: IO ()
main = runTCPClient serverName "80" runHTTP2Client
  where
    cliconf = ClientConfig "http" (C8.pack serverName) 20
    runHTTP2Client s = E.bracket (allocSimpleConfig s 4096)
                                 freeSimpleConfig
                                 (\conf -> run cliconf conf client)
    client sendRequest = do
        let req = requestNoBody methodGet "/" []
        _ <- forkIO $ sendRequest req $ \rsp -> do
            print rsp
            getResponseBodyChunk rsp >>= C8.putStrLn
        sendRequest req $ \rsp -> do
            threadDelay 100000
            print rsp
            getResponseBodyChunk rsp >>= C8.putStrLn
Synopsis

Runner

type Scheme = ByteString Source #

"http" or "https".

type Authority = ByteString Source #

For so-called "Host:" header.

Runner arguments

data ClientConfig Source #

Client configuration

Constructors

ClientConfig

Fields

allocSimpleConfig :: Socket -> BufferSize -> IO Config Source #

Making simple configuration whose IO is not efficient. A write buffer is allocated internally.

freeSimpleConfig :: Config -> IO () Source #

Deallocating the resource of the simple configuration.

HTTP/2 client

type Client a = ( Request -> ( Response -> IO a) -> IO a) -> IO a Source #

Client type.

Request

Creating request

requestStreaming :: Method -> Path -> RequestHeaders -> (( Builder -> IO ()) -> IO () -> IO ()) -> Request Source #

Creating request with streaming.

Trailers maker

type TrailersMaker = Maybe ByteString -> IO NextTrailersMaker Source #

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

data NextTrailersMaker Source #

Either the next trailers maker or final trailers.

defaultTrailersMaker :: TrailersMaker Source #

TrailersMake to create no trailers.

Response

Accessing response

responseStatus :: Response -> Maybe Status Source #

Getting the status of a response.

responseHeaders :: Response -> HeaderTable Source #

Getting the headers from a response.

responseBodySize :: Response -> Maybe Int Source #

Getting the body size from a response.

getResponseBodyChunk :: Response -> IO ByteString Source #

Reading a chunk of the response body. An empty ByteString returned when finished.

getResponseTrailers :: Response -> IO ( Maybe HeaderTable ) Source #

Reading response trailers. This function must be called after getResponseBodyChunk returns an empty.

Types

type Method = ByteString Source #

HTTP method (flat string type).

type FileOffset = Int64 Source #

Offset for file.

type ByteCount = Int64 Source #

How many bytes to read

RecvN

Position read for files

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

Making a position read and its closer.

data Sentinel Source #

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.