aiohttp 3.0 release

[Andrew Svetlov]

Brief

Major release, many already deprecated things are removed
Minimal supported Python version is 3.5.3.
aiohttp uses shiny async/await syntax everywhere internally (while old yield from is still supported).

Read https://docs.aiohttp.org/en/stable/whats_new_3_0.html for brief information about most important changes.

The full changelog is below:

3.0.0 (2018-02-12)

Features

• Speed up the PayloadWriter.write method for large request bodies. (#2126)
• StreamResponse and Response are now MutableMappings. (#2246)
• ClientSession publishes a set of signals to track the HTTP request execution.
  (#2313)
• Content-Disposition fast access in ClientResponse (#2455)
• Added support to Flask-style decorators with class-based Views. (#2472)
• Signal handlers (registered callbacks) should be coroutines. (#2480)
• Support async with test_client.ws_connect(...) (#2525)
• Introduce site and application runner as underlying API for web.run_app
  implementation. (#2530)
• Only quote multipart boundary when necessary and sanitize input (#2544)
• Make the aiohttp.ClientResponse.get_encoding method public with the
  processing of invalid charset while detecting content encoding. (#2549)
• Add optional configurable per message compression for
  ClientWebSocketResponse and WebSocketResponse. (#2551)
• Add hysteresis to StreamReader to prevent flipping between paused and
  resumed states too often. (#2555)
• Support .netrc by trust_env (#2581)
• Avoid to create a new resource when adding a route with the same name and
  path of the last added resource (#2586)
• MultipartWriter.boundary is str now. (#2589)
• Allow a custom port to be used by TestServer (and associated pytest
  fixtures) (#2613)
• Add param access_log_class to web.run_app function (#2615)
• Add ssl parameter to client API (#2626)
• Fixes performance issue introduced by #2577. When there are no middlewares
  installed by the user, no additional and useless code is executed. (#2629)
• Rename PayloadWriter to StreamWriter (#2654)
• New options reuse_port, reuse_address are added to run_app and
  TCPSite. (#2679)
• Use custom classes to pass client signals parameters (#2686)
• Use attrs library for data classes, replace namedtuple. (#2690)
• Pytest fixtures renaming, add aiohttp_ prefix (#2578)
• Add aiohttp- prefix for pytest-aiohttp command line
  parameters (#2578)

Bugfixes

• Correctly process upgrade request from server to HTTP2. aiohttp does not
  support HTTP2 yet, the protocol is not upgraded but response is handled
  correctly. (#2277)
• Fix ClientConnectorSSLError and ClientProxyConnectionError for proxy
  connector (#2408)
• Fix connector convert OSError to ClientConnectorError (#2423)
• Fix connection attempts for multiple dns hosts (#2424)
• Fix writing to closed transport by raising asyncio.CancelledError (#2499)
• Fix warning in ClientSession.__del__ by stopping to try to close it.
  (#2523)
• Fixed race-condition for iterating addresses from the DNSCache. (#2620)
• Fix default value of access_log_format argument in web.run_app (#2649)
• Freeze sub-application on adding to parent app (#2656)
• Do percent encoding for .url_for() parameters (#2668)
• Correctly process request start time and multiple request/response
  headers in access log extra (#2641)

Improved Documentation

• Improve tutorial docs, using literalinclude to link to the actual files.
  (#2396)
• Small improvement docs: better example for file uploads. (#2401)
• Rename from_env to trust_env in client reference. (#2451)
• Fixed mistype in Proxy Support section where trust_env parameter was
  used in session.get("http://python.org", trust_env=True) method instead of
  aiohttp.ClientSession constructor as follows:
  aiohttp.ClientSession(trust_env=True). (#2688)
• Fix issue with unittest example not compiling in testing docs. (#2717)

Deprecations and Removals

• Simplify HTTP pipelining implementation (#2109)
• Drop StreamReaderPayload and DataQueuePayload. (#2257)
• Drop md5 and sha1 finger-prints (#2267)
• Drop WSMessage.tp (#2321)
• Drop Python 3.4 and Python 3.5.0, 3.5.1, 3.5.2. Minimal supported Python
  versions are 3.5.3 and 3.6.0. yield from is gone, use async/await syntax.
  (#2343)
• Drop aiohttp.Timeout and use async_timeout.timeout instead. (#2348)
• Drop resolve param from TCPConnector. (#2377)
• Add DeprecationWarning for returning HTTPException (#2415)
• send_str(), send_bytes(), send_json(), ping() and pong() are
  genuine async functions now. (#2475)
• Drop undocumented app.on_pre_signal and app.on_post_signal. Signal
  handlers should be coroutines, support for regular functions is dropped.
  (#2480)
• StreamResponse.drain() is not a part of public API anymore, just use await StreamResponse.write(). StreamResponse.write is converted to async
  function. (#2483)
• Drop deprecated slow_request_timeout param and **kwargs`` fromRequestHandler`. (#2500)
• Drop deprecated resource.url(). (#2501)
• Remove %u and %l format specifiers from access log format. (#2506)
• Drop deprecated request.GET property. (#2547)
• Simplify stream classes: drop ChunksQueue and FlowControlChunksQueue,
  merge FlowControlStreamReader functionality into StreamReader, drop
  FlowControlStreamReader name. (#2555)
• Do not create a new resource on router.add_get(..., allow_head=True)
  (#2585)
• Drop access to TCP tuning options from PayloadWriter and Response classes
  (#2604)
• Drop deprecated encoding parameter from client API (#2606)
• Deprecate verify_ssl, ssl_context and fingerprint parameters in
  client API (#2626)
• Get rid of the legacy class StreamWriter. (#2651)
• Forbid non-strings in resource.url_for() parameters. (#2668)
• Deprecate inheritance from ClientSession and web.Application and
  custom user attributes for ClientSession, web.Request and
  web.Application (#2691)
• Drop resp = await aiohttp.request(...) syntax for sake of async with aiohttp.request(...) as resp:. (#2540)
• Forbid synchronous context managers for ClientSession and test
  server/client. (#2362)

Misc

• #2552

[Nikolay Kim]

Congratulations to the aiohttp team!

Sent from my iPhone

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