second-transfer-0.10.0.2: Second Transfer HTTP/2 web server

Safe HaskellSafe
LanguageHaskell2010

SecondTransfer.Exception

Contents

Description

 

Synopsis

Exceptions thrown by the HTTP/2 sessions

data HTTP2SessionException

Abstract exception. All HTTP/2 exceptions derive from here

Constructors

forall e . Exception e => HTTP2SessionException e 

Instances

data FramerException

Abstract exception. Thrown when encoding/decoding of a frame fails

Constructors

forall e . Exception e => FramerException e 

Instances

data BadPrefaceException

Thrown when the HTTP/2 connection prefix doesn't match the expected prefix.

Constructors

BadPrefaceException 

Instances

data HTTP11Exception

Abstract exception. All HTTP/1.1 related exceptions derive from here. Notice that this includes a lot of logical errors and they can be raised when handling HTTP/2 sessions as well

Constructors

forall e . Exception e => HTTP11Exception e 

Instances

data HTTP11SyntaxException

Constructors

HTTP11SyntaxException String 

Instances

data ClientSessionAbortedException

Concrete Exception. Used internally to signal that the server broke the connection. This is a public exception that clients of the library will see when acting as an HTTP client.

Constructors

ClientSessionAbortedException ConnectionCloseReason 

Instances

data HTTP500PrecursorException

Abstract exception. It is an error if an exception of this type bubbles to this library, but we will do our best to handle it gracefully in the Session engines. All internal error precursors at the workers can thus inherit from here to have a fallback option in case they forget to handle the error. It should also be used for the case of streaming requests that are interrupted by the upstream server. This exception inherits from HTTP11Exception

Constructors

forall e . Exception e => HTTP500PrecursorException e 

Instances

data GatewayAbortedException

Used by the ReverseProxy to signal an error from the upstream/Gateway

Constructors

GatewayAbortedException 

Instances

data ConnectionCloseReason

Reasons for a remote server interrupting a connectionn of this client

Constructors

NormalTermination_CCR

Corresponds to NO_ERROR

SessionAlreadyClosed_CCR

A request was done after the session was previously closed.

IOChannelClosed_CCR

This one happens when one of the IO channels is closed and a BlockedIndefinitelyOnMVar bubbles up. It should only happen in the test suite, as the OpenSSL_TLS channel uses a specialized exception type. If you see it in the wild, it is a bug.

ProtocolError_CCR

Any other reason

Instances

convertHTTP500PrecursorExceptionToException :: Exception e => e -> SomeException

Use the traditional idiom if you need to derive from HTTP500PrecursorException, this is one of the helpers

getHTTP500PrecursorExceptionFromException :: Exception e => SomeException -> Maybe e

Use the traditional idiom if you need to derive from HTTP500PrecursorException, this is one of the helpers

data ContentLengthMissingException

Thrown with HTTP1.1 over HTTP1.1 sessions when the response body or the request body doesn't include a Content-Length header field, given that should have included it

Constructors

ContentLengthMissingException 

Instances

Exceptions related to the IO layer

data IOProblem

Throw exceptions derived from this (e.g, GenericIOProblem below) to have the HTTP/2 session to terminate gracefully.

Constructors

forall e . Exception e => IOProblem e 

Instances

data GenericIOProblem

A concrete case of the above exception. Throw one of this if you don't want to implement your own type. Use IOProblem in catch signatures.

Constructors

GenericIOProblem 

Instances

data StreamCancelledException

This exception will be raised inside a CoherentWorker when the underlying stream is cancelled (STREAM_RESET in HTTP/2). Do any necessary cleanup in a handler, or simply use the fact that the exception is asynchronously delivered to your CoherentWorker Haskell thread, giving you an opportunity to interrupt any blocked operations.

Constructors

StreamCancelledException 

Instances

data NoMoreDataException

This is raised by the IOCallbacks when the endpoint is not willing to return or to accept more data

Constructors

NoMoreDataException 

Instances

Exceptions related to SOCKS5

data SOCKS5ProtocolException

Exception to denote that something failed with the SOCKS5 protocol

Constructors

SOCKS5ProtocolException 

Instances

Internal exceptions

data HTTP2ProtocolException

Concrete exception. Used internally to signal that the client violated the protocol. Clients of the library shall never see this exception.

Constructors

HTTP2ProtocolException 

Instances

Utility functions

ignoreException :: Exception e => Proxy e -> a -> IO a -> IO a

Simple utility function that ignores an exception. Good to work on threads when we know stuff. It takes as a first parameter a proxy.

reportExceptions :: forall a. IO a -> IO a

Simple utility function that reports exceptions

keyedReportExceptions :: forall a. String -> IO a -> IO a

forkIOExc :: String -> IO () -> IO ThreadId

Just report all unhandled and un-ignored exceptions

Proxies

blockedIndefinitelyOnMVar :: Proxy BlockedIndefinitelyOnMVar

blockedIndefinitelyOnSTM :: Proxy BlockedIndefinitelyOnSTM

noMoreDataException :: Proxy NoMoreDataException

ioProblem :: Proxy IOProblem

gatewayAbortedException :: Proxy GatewayAbortedException

ioException :: Proxy IOException