Interacting with Queue Server¶
Subscribing to Published Console Output¶
If console output publishing is enabled at RE Manager (parameter --zmq-publish), the output
is published to 0MQ socket. Client applications may subscribe to the messages and use them
for processing, display them to users or forward to other applications.
The messages are published to a PUB 0MQ socket running. Multiple applications may subscribe
to the socket simultaneously. The clients must be subscribed to the socket to receive the messages.
The messages are not delivered to the client if they are published while the client is
not subscribed to the socket. The messages are published using the topic named QS_Console.
Each message contains timestamped string printed by RE Manager. Some strings can be empty or contain multiple lines. Messages are python JSON-represented dictionaries with the following format:
{"time": <timestamp>, "msg": <message>}
<timestamp> is floating point number (returned by time.time()) and <message> is a string.
The bluesky-queueserver package provides convenience API class (ReceiveConsoleOutput) for
use in synchronous or thread-based applications. The class provides subscribe() and unsubscribe()
methods that enable caching of published messages by 0MQ and blocking recv() method (with timeout)
for loading published messages. See the class documentation for detailed description of the methods
and code examples.
The class allows to subscribe to published 0MQ messages and read the messages one by one as they arrive. |
|
Subscribe 0MQ socket to the console output topic. |
|
Unsubscribe 0MQ socket from the console output topic. |
|
Get the next published message. |
Asyncio-based applications (e.g. HTTP server) may use ReceiveConsoleOutputAsync API class to
receive captured console output. The class provides subscribe() and unsubscribe() methods
to explicitly subscribe and unsubscribe 0MQ socket. The class may be used in two modes: polling
using recv() method or setting callback function or coroutine with set_callback() method
and starting and then stopping acquisition with start() and stop() methods.
Async version of |
|
Subscribe 0MQ socket to the console output topic. |
|
Unsubscribe 0MQ socket from the console output topic. |
|
Get the next published message. |
|
Set callback function, which is called once for each received message. |
|
Start collection of messages published by RE Manager. |
|
Stop collection of messages published by RE Manager. |
Formatting Descriptions of Plans and Plan Parameters¶
format_text_descriptions function may be used to generate formatted text descriptions of
plans and plan parameters. The formatted descriptions are intended to be displayed to users
by client applications. See the docstring for the function for more details.
Format parameter descriptions for a plan from the list of allowed plans. |