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111 lines
3.4 KiB
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111 lines
3.4 KiB
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.. Copyright © 2020 Interplanetary Database Association e.V.,
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BigchainDB and IPDB software contributors.
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SPDX-License-Identifier: (Apache-2.0 AND CC-BY-4.0)
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Code is Apache-2.0 and docs are CC-BY-4.0
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.. _the-websocket-event-stream-api:
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The WebSocket Event Stream API
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==============================
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.. important::
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The WebSocket Event Stream runs on a different port than the Web API. The
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default port for the Web API is `9984`, while the one for the Event Stream
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is `9985`.
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BigchainDB provides real-time event streams over the WebSocket protocol with
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the Event Stream API.
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Connecting to an event stream from your application enables a BigchainDB node
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to notify you as events occur, such as new `valid transactions <#valid-transactions>`_.
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Demoing the API
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---------------
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You may be interested in demoing the Event Stream API with the `WebSocket echo test <http://websocket.org/echo.html>`_
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to familiarize yourself before attempting an integration.
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Determining Support for the Event Stream API
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--------------------------------------------
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It's a good idea to make sure that the node you're connecting with
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has advertised support for the Event Stream API. To do so, send a HTTP GET
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request to the node's :ref:`api-root-endpoint`
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(e.g. ``http://localhost:9984/api/v1/``) and check that the
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response contains a ``streams`` property:
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.. code:: JSON
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{
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...,
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"streams": "ws://example.com:9985/api/v1/streams/valid_transactions",
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...
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}
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Connection Keep-Alive
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---------------------
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The Event Stream API supports Ping/Pong frames as descibed in
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`RFC 6455 <https://tools.ietf.org/html/rfc6455#section-5.5.2>`_.
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.. note::
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It might not be possible to send PING/PONG frames via web browsers because
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of non availability of Javascript API on different browsers to achieve the
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same.
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Streams
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-------
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Each stream is meant as a unidirectional communication channel, where the
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BigchainDB node is the only party sending messages. Any messages sent to the
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BigchainDB node will be ignored.
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Streams will always be under the WebSocket protocol (so ``ws://`` or
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``wss://``) and accessible as extensions to the ``/api/v<version>/streams/``
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API root URL (for example, valid transactions
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would be accessible under ``/api/v1/streams/valid_transactions``). If you're
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running your own BigchainDB instance and need help determining its root URL,
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then see the page titled :ref:`determining-the-api-root-url`.
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All messages sent in a stream are in the JSON format.
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.. note::
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For simplicity, BigchainDB initially only provides a stream for all
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committed transactions. In the future, we may provide streams for other
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information. We may
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also provide the ability to filter the stream for specific qualities, such
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as a specific ``output``'s ``public_key``.
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If you have specific use cases that you think would fit as part of this
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API, consider creating a new `BEP <https://github.com/bigchaindb/BEPs>`_.
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Valid Transactions
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~~~~~~~~~~~~~~~~~~
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``/valid_transactions``
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Streams an event for any newly valid transactions committed to a block. Message
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bodies contain the transaction's ID, associated asset ID, and containing
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block's height.
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Example message:
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.. code:: JSON
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{
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"transaction_id": "<sha3-256 hash>",
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"asset_id": "<sha3-256 hash>",
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"height": <int>
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}
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.. note::
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Transactions in BigchainDB are committed in batches ("blocks") and will,
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therefore, be streamed in batches.
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