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AMQP 1.0 Client Library for Python

Project description

uAMQP for Python

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An AMQP 1.0 client library for Python.

Installation

Wheels are provided for most major operating systems, so you can install directly with pip:

$ pip install uamqp

If you are running a Linux distro that does not support ManyLinux1, you can install from source:

$ apt-get update
$ apt-get install -y build-essential libssl-dev uuid-dev cmake libcurl4-openssl-dev pkg-config python3-dev python3-pip
$ pip3 install uamqp --no-binary

Python 2.7 support

Coming soon…

Documentation

Reference documentation can be found here: docs.microsoft.com/python/api/uamqp/uamqp.

Developer Setup

In order to run the code directly, the Cython extension will need to be build first.

Pre-requisites

  • Windows: Setup a build environment.
  • Linux: Install dependencies as descriped above in the installation instructions.
  • MacOS: Install cmake using Homebrew:
$ brew install cmake

Building the extension

This project has two C library dependencies. They are vendored in this repository in these versions:

To build, start by creating a virtual environment and installing the required Python packages:

$ python -m venv env
$ env/Scripts/activate
(env)$ pip install -r dev_requirements.txt

Next, run the build command:

$ python setup.py built_ext --inplace

Tests

The tests can be run from within the virtual environment. The extension must be built first using the instructions above.

(env)$ pytest

Provide Feedback

If you encounter any bugs or have suggestions, please file an issue in the Issues section of the project.

Contributing

This project welcomes contributions and suggestions. Most contributions require you to agree to a Contributor License Agreement (CLA) declaring that you have the right to, and actually do, grant us the rights to use your contribution. For details, visit https://cla.microsoft.com.

When you submit a pull request, a CLA-bot will automatically determine whether you need to provide a CLA and decorate the PR appropriately (e.g., label, comment). Simply follow the instructions provided by the bot. You will only need to do this once across all repos using our CLA.

This project has adopted the Microsoft Open Source Code of Conduct. For more information see the Code of Conduct FAQ or contact opencode@microsoft.com with any additional questions or comments.

Release History

1.0.3 (2018-09-14)

  • Reduced CPU load during idle receive.
  • Updated Azure uAMQP C and Azure C Shared Utility dependencies.

1.0.2 (2018-09-05)

  • Fixed additional bugs in setting MessageProperties as string or bytes.
  • Removed auth locking to prevent locking issues on keyboard interrupt.

1.0.1 (2018-08-29)

  • Added some more checks in place to prevent lock hanging on a keybaord interrupt.
  • Fixed bug in setting MessageProperties.subject as string or bytes.
  • uamqp.send_message now returns a list of uamqp.constants.MessageState to indicate the success of each message sent.

1.0.0 (2018-08-20)

  • API settled.

  • Behaviour change When a SendClient or SendClientAsync is shutdown, any remaining pending messages (that is messages in the states WaitingToBeSent and WaitingForSendAck) will no longer be cleared, but can be retrieved from a new attribute SendClient.pending_messages in order to be re-processed as needed.

  • Behaviour change The function SendClient.queue_message now allows for queueing multiple messages at once by simply passing in additional message instances:

    • send_client.queue_message(my_message)
    • send_client.queue_message(message_1, message_2, message_3)
    • send_client.queue_message(*my_message_list)
  • An authentication object will now raise a ValueError if one attempts to use it for more than one connection.

  • Renamed internal _async module to non-private async_ops to allow for docs generation.

  • Reformatted logging for better performance.

  • Added additional logging.

0.2.1 (2018-08-06)

  • Fixed potential crashing in bindings for amqpvalue.
  • Fixed bindings fault in cbs PUT token complete callback.
  • Updated uAMQP-C.
  • Added additional auth and connection locking for thread/async safety.
  • Increased INFO level logging.
  • Removed platform deinitialization until it can be improved.
  • Added handling for a connection reaching a client-caused error state.

0.2.0 (2018-07-25)

  • Breaking change MessageSender.send_async has been renamed to MessageSender.send, and MessageSenderAsync.send_async is now a coroutine.

  • Breaking change Removed detach_received callback argument from MessageSender, MessageReceiver, MessageSenderAsync, and MessageReceiverAsync in favour of new error_policy argument.

  • Added ErrorPolicy class to determine how the client should respond to both generic AMQP errors and custom or vendor-specific errors. A default policy will be used, but a custom policy can be added to any client by using a new error_policy argument. Value must be either an instance or subclass of ErrorPolicy.

    • The error_policy argument has also been added to MessageSender, MessageReceiver, Connection, and their async counterparts to allow for handling of link DETACH and connection CLOSE events.
    • The error policy passed to a SendClient determines the number of message send retry attempts. This replaces the previous constants.MESSAGE_SEND_RETRIES value which is now deprecated.
    • Added new ErrorAction object to determine how a client should respond to an error. It has three properties: retry (a boolean to determine whether the error is retryable), backoff (an integer to determine how long the client should wait before retrying, default is 0) and increment_retries (a boolean to determine whether the error should count against the maximum retry attempts, default is True). Currently backoff and increment_retries are only considered for message send failures.
    • Added VendorConnectionClose and VendorLinkDetach exceptions for non-standard (unrecognized) connection/link errors.
  • Added support for HTTP proxy configuration.

  • Added support for running async clients synchronously.

  • Added keep-alive support for connection - this is a background thread for a synchronous client, and a background async function for an async client. The keep-alive feature is disabled by default, to enable, set the keep_alive_interval argument on the client to an integer representing the number of seconds between connection pings.

  • Added support for catching a Connection CLOSE event.

  • Added support for Connection.sleep and ConnectionAsync.sleep_async to pause the connection.

  • Added support for surfacing message disposition delivery-state (with error information).

  • Added constants.ErrorCodes enum to map standard AMQP error conditions. This replaces the previous constants.ERROR_CONNECTION_REDIRECT and constants.ERROR_LINK_REDIRECT which are now both deprecated.

  • Added new super error AMQPError from which all exceptions inherit.

  • Added new MessageHandlerError exception, a subclass of AMQPConnectionError, for Senders/Receivers that enter an indeterminate error state.

  • MessageException is now a subclass of MessageResponse.

  • Added ClientMessageError exception, a subclass of MessageException for send errors raised client-side.

  • Catching Link DETACH event will now work regardless of whether service returns delivery-state.

  • Fixed bug where received messages attempting to settle on a detached link crashed the client.

  • Fixed bug in amqp C DescribedValue.

  • Fixed bug where client crashed on deallocating failed management operation.

0.1.1 (2018-07-14)

  • Removed circular dependency in Python 3.4 with types.py/utils.py
  • When a header properties is not set, returns None rather than raising ValueError.
  • Fixed bug in receiving messages with application properties.

0.1.0 (2018-07-05)

  • Fixed bug in error handling for CBS auth to invalid hostname.
  • Changed C error logging to debug level.
  • Bumped uAMQP C version to 1.2.7
  • Fixed memory leaks and deallocation bugs with Properties and Annotations.

0.1.0rc2 (2018-07-02)

  • Breaking change Submodule async has been renamed to the internal _async. All asynchronous classes in the submodule can now be accessed from uamqp or uamqp.authentication directly.

  • Breaking change Anything returned by a callback supplied to receive messages will now be ignored.

  • Breaking change Changed message state enum values:

    • Complete -> SendComplete
    • Failed -> SendFailed
    • WaitingForAck -> WaitingForSendAck
  • Added new message state enum values:

    • ReceivedUnsettled
    • ReceivedSettled
  • Breaking change Changes to message settlement exceptions:

    • Combined the AbandonMessage and DeferMessage exceptions as MessageModified to be in keeping with the AMQP specification.
    • Renamed AcceptMessage to MessageAccepted.
    • Renamed RejectMessage to MessageRejected which now takes condition and description arguments rather than message.
  • Added errors.LinkDetach exception as new subclass of AMQPConnectionError as a wrapped for data in a Link DETACH dispostition.

  • Added errors.LinkRedirect as a specific subclass of LinkDetach to decode the specific redirect fields of a Link Redirect response.

  • Added errors.MessageAlreadySettled exception for operations performed on a received message that has already returned a receipt dispostition.

  • Added errors.MessageReleased exception.

  • Added errors.ErrorResponse exception.

  • A received Message can now be explicitly settled through a set of new functions on the message:

    • Message.accept()
    • Message.reject(condition:str, description:str)
    • Message.release()
    • Message.modify(failed:bool, deliverable:bool, annotations:dict)
  • Added explicit auto_complete argument to ReceiveClient and ReceiveClientAsync. If auto_complete is set to False then all messages must be explicitly “accepted” or “rejected” by the user otherwise they will timeout and be released. The default is True, which is the exiting behaviour for each receive mechanism:

    • Received messages processed by callback (ReceiveClient.receive_messages()) will be automatically “accepted” if no explicit response has been set on completion of the callback.
    • Received messages processed by batch (ReceiveClient.receive_message_batch()) will by automatically “accepted” before being returned to the user.
    • Received messages processed by iterator (ReceiveClient.receive_message_iter()) will by automatically “accepted” if no explicit response has been set once the generator is incremented.
  • Added new methods to clients and connections to allow to redirect to an alternative endpoint when a LinkRedirect exception is raised. The client redirect helper cannot be used for clients that use a shared connection - the clients must be closed before the connection can be redirected. New credentials must be supplied for the new endpoint. The new methods are:

    • uamqp.Connection.redirect(redirect_info, auth)
    • uamqp.async.ConnectionAsync.redirect_async(redirect_info, auth)
    • uamqp.SendClient.redirect(redirect_info, auth)
    • uamqp.ReceiveClient.redirect(redirect_info, auth)
    • uamqp.async.SendClientAsync.redirect_async(redirect_info, auth)
    • uamqp.async.ReceiveClientAsync.redirect_async(redirect_info, auth)
  • Added on_detach_received argument to Sender and Receiver classes to pass in callback to run on Link DETACH.

  • Removed automatic char encoding for strings of length 1, and added types.AMQPChar for explicit encoding.

  • Bumped uAMQP C version to 1.2.5

  • Bumped Azure C Shared Utility to 1.1.5

  • Fixed memory leaks in MessageProperties, MessageHeader and message annotations.

0.1.0rc1 (2018-05-29)

  • Fixed import error in async receiver.
  • Exposed sender/receiver destroy function.
  • Moved receiver.open on_message_received argument to constructor.
  • Removed sasl module and moved internal classes into authentication module.
  • Added encoding parameter everywhere where strings are encoded.
  • Started documentation.
  • Updated uAMQP-C to 1.2.4 and C Shared Utility to 1.1.4 (includes fix for issue #12).
  • Fixed return type of MgmtOperation.execute - now returns ~uamqp.message.Message.
  • Made AMQP connection/session/sender/receiver types in a client overridable.
  • Added debug trace to management operations.
  • Fixed error in management callback on failed operation.
  • Default AMQP encoding of bytes is now a String type and a bytearray is a Binary type.
  • Added AMQP Array type and fixed Long type range validation.
  • Added header argument to Message and BatchMessage for setting a MessageHeader.
  • Fixed MessageHeader attribute setters.

0.1.0b5 (2018-04-27)

  • Added Certifi as a depedency to make OpenSSL certs dynamic.
  • Added verify option to authentication classes to allow setting custom certificate path (for Linux and OSX).

0.1.0b4 (2018-04-19)

  • Fixed memory leak in async receive.
  • Removed close_on_done argument from client receive functions.
  • Added receive iterator to synchronous client.
  • Made async iter receive compatible with Python 3.5.

0.1.0b3 (2018-04-14)

  • Fixed SSL errors in manylinux wheels.
  • Fixed message annoations attribute.
  • Fixed bugs in batched messages and sending batched messages.
  • Fixed conflicting receiver link ID.
  • Fixed hanging receiver by removing queue max size in sync clients.
  • Added support for sending messages with None and empty bodies.

0.1.0b2 (2018-04-06)

  • Added message send retry.
  • Added timeouts and better error handling for management requests.
  • Improved connection and auth error handling and error messages.
  • Fixed message annotations type.
  • SendClient.send_all_messages() now returns a list of message send statuses.
  • Fixed OpenSSL platform being initialized multiple times.
  • Fixed auto-refresh of SAS tokens.
  • Altered receive_batch behaviour to return messages as soon as they’re available.
  • Parameter batch_size in receive_batch renamed to max_batch_size.
  • Fixed message application_properties decode error.
  • Removed MacOS dependency on OpenSSL and libuuid.

0.1.0b1 (2018-03-24)

  • Added management request support.
  • Fixed message-less C operation ValueError.
  • Store message metadata in Python rather than C.
  • Refactored Send and Receive clients to create a generic parent AMQPClient.
  • Fixed None receive timestamp bug.
  • Removed async iterator queue due to instabilities - all callbacks are now synchronous.

0.1.0a3 (2018-03-19)

  • Added support for asynchronous message receive by iterator or batch.
  • Removed synchronous receive iterator, and replaced with synchronous batch receive.
  • Added sync and async context managers for Send and Receive Clients.
  • Fixed token instability and added put token retry policy.
  • Exposed Link ATTACH properties.
  • A connection now has a single $cbs session that can be reused between clients.
  • Added C debug trace logging to the Python logger (‘uamqp.c_uamqp’)

0.1.0a2 (2018-03-12)

  • Exposed OPEN performative properties for connection telemetry.
  • Exposed setters for message.message_annotations and message.application_properties.
  • Made adjustments to connection open and close to facilitate sharing a connection object between send/receive clients.
  • Support for username/password embedded in connection URI.
  • Clients can now optionally leave connection/session/link open for re-use.
  • Updated build process and installation instructions.
  • Various bug fixes to increase stability.

0.1.0a1 (2018-03-04)

  • Initial release

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