Welcome to Brewtils’s documentation!¶

Contents:

Brewtils¶

Brewtils is the Python library for interfacing with Beergarden systems. If you are planning on writing beer-garden plugins, this is the correct library for you. In addition to writing plugins, it provides simple ways to query the API and is officially supported by the beer-garden team.

Features¶

Brewtils helps you interact with beer-garden.

Easy way to create beer-garden plugins
Full support of the entire Beer-Garden API
Officially supported by the beer-garden team

Installation¶

To install brewtils, run this command in your terminal:

$ pip install brewtils

Or add it to your requirements.txt

$ cat brewtils >> requirements.txt
$ pip install -r requirements.txt

Quick Start¶

You can create your own beer-garden plugins without much problem at all. To start, we’ll create the obligatory hello-world plugin. Creating a plugin is as simple as:

from brewtils.decorators import system, parameter, command
from brewtils.plugin import RemotePlugin

@system
class HelloWorld(object):

    @parameter(key="message", description="The message to echo", type="String")
    def say_hello(self, message="World!"):
        print("Hello, %s!" % message)
        return "Hello, %s!" % message

if __name__ == "__main__":
    client = HelloWorld()
    plugin = RemotePlugin(client,
                          name="hello",
                          version="0.0.1",
                          bg_host='127.0.0.1',
                          bg_port=2337)
    plugin.run()

Assuming you have a Beer Garden running on port 2337 on localhost, running this will register and start your plugin! You now have your first plugin running in beer-garden. Let’s use another part of the brewtils library to exercise your plugin from python.

The SystemClient is designed to help you interact with registered Systems as if they were native Python objects.

from brewtils.rest.system_client import SystemClient

hello_client = SystemClient('localhost', 2337, 'hello')

request = hello_client.say_hello(message="from system client")

print(request.status) # 'SUCCESS'
print(request.output) # Hello, from system client!

In the background, the SystemClient has executed an HTTP POST with the payload required to get beer-garden to execute your command. The SystemClient is how most people interact with beer-garden when they are in the context of python and want to be making requests.

Of course, the rest of the API is accessible through the brewtils package. The EasyClient provides simple convenient methods to call the API and auto-serialize the responses. Suppose you want to get a list of all the commands on all systems:

from brewtils.rest.easy_client import EasyClient

client = EasyClient('localhost', 2337)

systems = client.find_systems()

for system in systems:
    for command in system.commands:
        print(command.name)

This is just a small taste of what is possible with the EasyClient. Feel free to explore all the methods that are exposed.

For more detailed information and better walkthroughs, checkout the full documentation!

Documentation¶

Full Beer Garden documentation is available at https://beer-garden.io
Brewtils Documentation is available at https://brewtils.readthedocs.io

Installation¶

Stable release¶

To install Brewtils, run this command in your terminal:

$ pip install brewtils

This is the preferred method to install Brewtils, as it will always install the most recent stable release.

If you don’t have pip installed, this Python installation guide can guide you through the process.

From sources¶

The sources for Brewtils can be downloaded from the Github repo.

You can either clone the public repository:

$ git clone git@github.com/beer-garden/brewtils.git

Or download the tarball:

$ curl  -OL https://github.com/beer-garden/brewtils/tarball/master

Once you have a copy of the source, you can install it with:

$ python setup.py install

Usage¶

Brewtils¶

Brewtils is the Python library for interfacing with Beergarden systems. If you are planning on writing beer-garden plugins, this is the correct library for you. In addition to writing plugins, it provides simple ways to query the API and is officially supported by the beer-garden team.

Features¶

Brewtils helps you interact with beer-garden.

Easy way to create beer-garden plugins
Full support of the entire Beer-Garden API
Officially supported by the beer-garden team

Installation¶

To install brewtils, run this command in your terminal:

$ pip install brewtils

Or add it to your requirements.txt

$ cat brewtils >> requirements.txt
$ pip install -r requirements.txt

Quick Start¶

You can create your own beer-garden plugins without much problem at all. To start, we’ll create the obligatory hello-world plugin. Creating a plugin is as simple as:

from brewtils.decorators import system, parameter, command
from brewtils.plugin import RemotePlugin

@system
class HelloWorld(object):

    @parameter(key="message", description="The message to echo", type="String")
    def say_hello(self, message="World!"):
        print("Hello, %s!" % message)
        return "Hello, %s!" % message

if __name__ == "__main__":
    client = HelloWorld()
    plugin = RemotePlugin(client,
                          name="hello",
                          version="0.0.1",
                          bg_host='127.0.0.1',
                          bg_port=2337)
    plugin.run()

Assuming you have a Beer Garden running on port 2337 on localhost, running this will register and start your plugin! You now have your first plugin running in beer-garden. Let’s use another part of the brewtils library to exercise your plugin from python.

The SystemClient is designed to help you interact with registered Systems as if they were native Python objects.

from brewtils.rest.system_client import SystemClient

hello_client = SystemClient('localhost', 2337, 'hello')

request = hello_client.say_hello(message="from system client")

print(request.status) # 'SUCCESS'
print(request.output) # Hello, from system client!

In the background, the SystemClient has executed an HTTP POST with the payload required to get beer-garden to execute your command. The SystemClient is how most people interact with beer-garden when they are in the context of python and want to be making requests.

Of course, the rest of the API is accessible through the brewtils package. The EasyClient provides simple convenient methods to call the API and auto-serialize the responses. Suppose you want to get a list of all the commands on all systems:

from brewtils.rest.easy_client import EasyClient

client = EasyClient('localhost', 2337)

systems = client.find_systems()

for system in systems:
    for command in system.commands:
        print(command.name)

This is just a small taste of what is possible with the EasyClient. Feel free to explore all the methods that are exposed.

For more detailed information and better walkthroughs, checkout the full documentation!

Documentation¶

Full Beer Garden documentation is available at https://beer-garden.io
Brewtils Documentation is available at https://brewtils.readthedocs.io

brewtils¶

brewtils package¶

Subpackages¶

brewtils.log package¶

Module contents¶

Brewtils Logging Utilities

This module is for setting up your plugins logging correctly.

Example

In order to use this, you should simply call setup_logger in the same file where you initialize your plugin sometime before you initialize your Plugin object.

host = 'localhost'
port = 2337
ssl_enabled = False
system_name = 'my_system'

setup_logger(bg_host=host, bg_port=port, system_name=system_name, ssl_enabled=ssl_enabled)
plugin = Plugin(my_client, bg_host=host, bg_port=port, ssl_enabled=ssl_enabled,
                name=system_name, version="0.0.1")
plugin.run()

brewtils.log.convert_logging_config(logging_config)[source]¶

Converts a LoggingConfig object into a python logging configuration

The python logging configuration that is returned can be passed to logging.config.dictConfig

Parameters:	logging_config –
Returns:	Python logging configuration

brewtils.log.get_python_logging_config(bg_host, bg_port, system_name, ca_cert=None, client_cert=None, ssl_enabled=None)[source]¶

Returns a dictionary for the python logging configuration

Parameters:

bg_host (str) – Hostname of a beer-garden
bg_port (int) – Port beer-garden is listening on
system_name (str) – The system
ca_cert – Certificate that issued the server certificate used by the beer-garden server
client_cert – Certificate used by the server making the connection to beer-garden
ssl_enabled (bool) – Whether to use SSL for beer-garden communication

Returns:

Python logging configuration

brewtils.log.setup_logger(bg_host, bg_port, system_name, ca_cert=None, client_cert=None, ssl_enabled=None)[source]¶

Configures python logging module to use logging specified in beer-garden API.

This method will overwrite your current logging configuration, so only call it if you want beer-garden’s logging configuration.

Parameters:

bg_host (str) – Hostname of a beer-garden
bg_port (int) – Port beer-garden is listening on
system_name (str) – The system
ca_cert – Certificate that issued the server certificate used by the beer-garden server
client_cert – Certificate used by the server making the connection to beer-garden
ssl_enabled (bool) – Whether to use SSL for beer-garden communication

Returns:

brewtils.rest package¶

Submodules¶

brewtils.rest.client module¶

class brewtils.rest.client.BrewmasterRestClient(*args, **kwargs)[source]¶: Bases: brewtils.rest.client.RestClient

class brewtils.rest.client.RestClient(host, port, ssl_enabled=False, api_version=None, logger=None, ca_cert=None, client_cert=None, url_prefix=None, ca_verify=True)[source]¶

Bases: object

Simple Rest Client for communicating to with beer-garden.

The is the low-level client responsible for making the actual REST calls. Other clients (e.g. brewtils.rest.easy_client.EasyClient) build on this by providing useful abstractions.

Parameters:

host – beer-garden REST API hostname.
port – beer-garden REST API port.
ssl_enabled – Flag indicating whether to use HTTPS when communicating with beer-garden.
api_version – The beer-garden REST API version. Will default to the latest version.
logger – The logger to use. If None one will be created.
ca_cert – beer-garden REST API server CA certificate.
client_cert – The client certificate to use when making requests.
url_prefix – beer-garden REST API Url Prefix.
ca_verify – Flag indicating whether to verify server certificate when making a request.

JSON_HEADERS = {'Accept': 'text/plain', 'Content-type': 'application/json'}¶

LATEST_VERSION = 1¶

delete_queue(queue_name)[source]¶

Performs a DELETE on a specific Queue URL

Returns:	Response to the request

delete_queues()[source]¶

Performs a DELETE on the Queues URL

Returns:	Response to the request

delete_system(system_id)[source]¶

Performs a DELETE on a System URL

Parameters:	system_id – The ID of the system to remove
Returns:	Response to the request

get_command(command_id)[source]¶

Performs a GET on the Command URL

Parameters:	command_id – ID of command
Returns:	Response to the request

get_commands()[source]¶: Performs a GET on the Commands URL

get_logging_config(**kwargs)[source]¶

Perform a GET to the logging config URL

Parameters:	kwargs – Parameters to be used in the GET request
Returns:	The request response

get_queues()[source]¶

Performs a GET on the Queues URL

Returns:	Response to the request

get_request(request_id)[source]¶

Performs a GET on the Request URL

Parameters:	request_id – ID of request
Returns:	Response to the request

get_requests(**kwargs)[source]¶

Performs a GET on the Requests URL

Parameters:	kwargs – Parameters to be used in the GET request
Returns:	Response to the request

get_system(system_id, **kwargs)[source]¶

Performs a GET on the System URL

Parameters:	system_id – ID of system kwargs – Parameters to be used in the GET request
Returns:	Response to the request

get_systems(**kwargs)[source]¶

Perform a GET on the System collection URL

Parameters:	kwargs – Parameters to be used in the GET request
Returns:	The request response

get_version(**kwargs)[source]¶

Perform a GET to the version URL

Parameters:	kwargs – Parameters to be used in the GET request
Returns:	The request response

patch_instance(instance_id, payload)[source]¶

Performs a PATCH on the instance URL

Parameters:	instance_id – ID of instance payload – The update specification
Returns:	Response

patch_request(request_id, payload)[source]¶

Performs a PATCH on the Request URL

Parameters:	request_id – ID of request payload – New request definition
Returns:	Response to the request

patch_system(system_id, payload)[source]¶

Performs a PATCH on a System URL

Parameters:	system_id – ID of system payload – The update specification
Returns:	Response

post_event(payload, publishers=None)[source]¶

Performs a POST on the event URL

Parameters:	payload – New event definition publishers – Array of publishers to use
Returns:	Response to the request

post_requests(payload)[source]¶

Performs a POST on the Request URL

Parameters:	payload – New request definition
Returns:	Response to the request

post_systems(payload)[source]¶

Performs a POST on the System URL

Parameters:	payload – New request definition
Returns:	Response to the request

brewtils.rest.easy_client module¶

class brewtils.rest.easy_client.BrewmasterEasyClient(*args, **kwargs)[source]¶: Bases: brewtils.rest.easy_client.EasyClient

class brewtils.rest.easy_client.EasyClient(host, port, ssl_enabled=False, api_version=None, ca_cert=None, client_cert=None, parser=None, logger=None, url_prefix=None, ca_verify=True)[source]¶

Bases: object

Client for communicating with beer-garden.

This class provides nice wrappers around the functionality provided by a brewtils.rest.client.RestClient

Parameters:

host – beer-garden REST API hostname.
port – beer-garden REST API port.
ssl_enabled – Flag indicating whether to use HTTPS when communicating with beer-garden.
api_version – The beer-garden REST API version. Will default to the latest version.
ca_cert – beer-garden REST API server CA certificate.
client_cert – The client certificate to use when making requests.
parser – The parser to use. If None will default to an instance of BrewmasterSchemaParser.
logger – The logger to use. If None one will be created.
url_prefix – beer-garden REST API URL Prefix.
ca_verify – Flag indicating whether to verify server certificate when making a request.

clear_all_queues()[source]¶

Cancel and clear all messages from all queues

Returns:	The response

clear_queue(queue_name)[source]¶

Cancel and clear all messages from a queue

Returns:	The response

create_request(request)[source]¶

Create a new request.

Parameters:	request – The request to create
Returns:	The response

create_system(system)[source]¶

Create a new system by POSTing to a BREWMASTER server.

Parameters:	system – The system to create
Returns:	The system creation response

find_requests(**kwargs)[source]¶

Find requests using keyword arguments as search parameters.

Parameters:	kwargs – Search parameters
Returns:	A list of request instances satisfying the given search parameters

find_systems(**kwargs)[source]¶

Find systems using keyword arguments as search parameters.

Parameters:	kwargs – Search parameters
Returns:	A list of system instances satisfying the given search parameters

find_unique_request(**kwargs)[source]¶

Find a unique request using keyword arguments as search parameters.

Note

If ‘id’ is present in kwargs then all other parameters will be ignored.

Parameters:	kwargs – Search parameters
Returns:	One request instance

find_unique_system(**kwargs)[source]¶

Find a unique system using keyword arguments as search parameters.

Parameters:	kwargs – Search parameters
Returns:	One system instance

get_logging_config(system_name)[source]¶

Get the logging configuration for a particular system.

Parameters:	system_name – Name of system
Returns:	LoggingConfig object

get_queues()[source]¶

Retrieve all queue information

Returns:	The response

get_version(**kwargs)[source]¶

initialize_instance(instance_id)[source]¶

Start an instance by PATCHing to a BREWMASTER server.

Parameters:	instance_id – The ID of the instance to start
Returns:	The start response

instance_heartbeat(instance_id)[source]¶

Send heartbeat to BREWMASTER for health and status purposes

Parameters:	instance_id – The ID of the instance
Returns:	The response

publish_event(*args, **kwargs)[source]¶

Publish a new event.

Parameters:	args – The Event to create _publishers – Optional list of specific publishers. If None all publishers will be used. kwargs – If no Event is given in the *args, on will be constructed from the kwargs
Returns:	The response

remove_system(**kwargs)[source]¶

Remove a specific system using keyword arguments as search parameters.

Parameters:	kwargs – Search parameters
Returns:	The response

update_instance_status(instance_id, new_status)[source]¶

Update an instance by PATCHing to a BREWMASTER server.

Parameters:	instance_id – The ID of the instance to start new_status – The updated status
Returns:	The start response

update_request(request_id, status=None, output=None, error_class=None)[source]¶

Set various fields on a request with a PATCH

Parameters:	request_id – The ID of the request to update status – The new status output – The new output error_class – The new error class
Returns:	The response

update_system(system_id, new_commands=None, **kwargs)[source]¶

Update a system with a PATCH

Keyword Arguments:
Parameters:	system_id – The ID of the system to update new_commands – The new commands
	metadata (`dict`) The updated metadata for the system description (`str`) The updated description for the system display_name (`str`) The updated display_name for the system icon_name (`str`) The updated icon_name for the system
Returns:	The response

brewtils.rest.system_client module¶

class brewtils.rest.system_client.BrewmasterSystemClient(*args, **kwargs)[source]¶: Bases: brewtils.rest.system_client.SystemClient

class brewtils.rest.system_client.SystemClient(host, port, system_name, version_constraint='latest', default_instance='default', always_update=False, timeout=None, max_delay=30, api_version=None, ssl_enabled=False, ca_cert=None, blocking=True, max_concurrent=None, client_cert=None, url_prefix=None, ca_verify=True)[source]¶

Bases: object

High-level client for generating requests for a beer-garden System.

SystemClient creation:

This class is intended to be the main way to create beer-garden requests. Create an instance with beer-garden connection information (optionally including a url_prefix) and a system name:

client = SystemClient(host, port, 'example_system', ssl_enabled=True, url_prefix=None)

Pass additional keyword arguments for more granularity:

version_constraint:

Allows specifying a particular system version. Can be a version literal (‘1.0.0’) or the special value ‘latest.’ Using ‘latest’ will allow the the SystemClient to retry a request if it fails due to a missing system (see Creating Requests).

default_instance:

The instance name to use when creating a request if no other instance name is specified. Since each request must be addressed to a specific instance this is a convenience to prevent needing to specify the ‘default’ instance for each request.

always_update:

Always attempt to reload the system definition before making a request. This is useful to ensure Requests are always made against the latest version of the system. If not set the System definition will be loaded once (upon making the first request) and then only reloaded if a Request fails.

Loading the System:

The System definition is lazily loaded, so nothing happens until the first attempt to send a Request. At that point the SystemClient will query beer-garden to get a system definition that matches the system_name and version_constraint. If no matching system can be found a BrewmasterFetchError will be raised. If always_update was set to True this will happen before making each request, not just the first.

Making a Request:

The standard way to create and send requests is by calling object attributes:

request = client.example_command(param_1='example_param')

In the normal case this will block until the request completes. Request completion is determined by periodically polling beer-garden to check the Request status. The time between polling requests starts at 0.5s and doubles each time the request has still not completed, up to max_delay. If a timeout was specified and the Request has not completed within that time a BrewmasterTimeoutError will be raised.

It is also possible to create the SystemClient in non-blocking mode by specifying blocking=False. In this case the request creation will immediately return a Future and will spawn a separate thread to poll for Request completion. The max_concurrent parameter is used to control the maximum threads available for polling.

# Create a SystemClient with blocking=False
client = SystemClient(host, port, 'example_system', ssl_enabled=True, blocking=False)

# Create and send 5 requests without waiting for request completion
futures = [client.example_command(param_1=number) for number in range(5)]

# Now wait on all requests to complete
concurrent.futures.wait(futures)

If the request creation process fails (e.g. the command failed validation) and version_constraint is ‘latest’ then the SystemClient will check to see if a different version is available, and if so it will attempt to make the request on that version. This is so users of the SystemClient that don’t necessarily care about the target system version don’t need to be restarted if the target system is updated.

Tweaking beer-garden Request Parameters:

There are several parameters that control how beer-garden routes / processes a request. To denote these as intended for beer-garden itself (rather than a parameter to be passed to the Plugin) prepend a leading underscore to the argument name.

Sending to another instance:

request = client.example_command(_instance_name='instance_2', param_1='example_param')

Request with a comment:

request = client.example_command(_comment='I'm a beer-garden comment!',
                                 param_1='example_param')

Without the leading underscore the arguments would be treated the same as param_1 - another parameter to be passed to the plugin.

Parameters:

host – beer-garden REST API hostname.
port – beer-garden REST API port.
system_name – The name of the system to use.
version_constraint – The system version to use. Can be specific or ‘latest’.
default_instance – The instance to use if not specified when creating a request.
always_update – Should check for a newer System version before each request.
timeout – Length of time to wait for a request to complete. ‘None’ means wait forever.
max_delay – Maximum time to wait between checking the status of a created request.
api_version – beer-garden API version.
ssl_enabled – Flag indicating whether to use HTTPS when communicating with beer-garden.
ca_cert – beer-garden REST API server CA certificate.
blocking – Block after request creation until the request completes.
max_concurrent – Maximum number of concurrent requests allowed.
client_cert – The client certificate to use when making requests.
url_prefix – beer-garden REST API URL Prefix.
ca_verify – Flag indicating whether to verify server certificate when making a request.

create_bg_request(command_name, **kwargs)[source]¶

Create a callable that will execute a beer-garden request when called.

Normally you interact with the SystemClient by accessing attributes, but there could be certain cases where you want to create a request without sending it.

Example:

client = SystemClient(host, port, 'system', blocking=False)
requests = []

# No arguments
requests.append(client.create_bg_request('command_1'))

# arg_1 will be passed as a parameter
requests.append(client.create_bg_request('command_2', arg_1='Hi!'))

futures = [request() for request in requests]   # Calling creates and sends the request
concurrent.futures.wait(futures)                # Wait for all the futures to complete

Parameters:	command_name – The name of the command that will be sent. kwargs – Additional arguments to pass to send_bg_request.
Raises:	AttributeError – The system does not have a command with the given command_name.
Returns:	A partial that will create and execute a beer-garden request when called.

load_bg_system()[source]¶

Query beer-garden for a System definition

This method will make the query to beer-garden for a System matching the name and version constraints specified during SystemClient instance creation.

If this method completes successfully the SystemClient will be ready to create and send Requests.

Raises:	BrewmasterFetchError – If unable to find a matching System
Returns:	None

send_bg_request(**kwargs)[source]¶

Actually create a Request and send it to beer-garden

Note

This method is intended for advanced use only, mainly cases where you’re using the SystemClient without a predefined System. It assumes that everything needed to construct the request is being passed in kwargs. If this doesn’t sound like what you want you should check out create_bg_request.

Parameters:	kwargs – All necessary request parameters, including beer-garden internal parameters
Raises:	BrewmasterValidationError – If the Request creation failed validation on the server
Returns:	If the SystemClient was created with blocking=True a completed request object, otherwise a Future that will return the Request when it completes.

Module contents¶

brewtils.rest.normalize_url_prefix(url_prefix)[source]¶

Submodules¶

brewtils.choices module¶

class brewtils.choices.FunctionTransformer[source]¶

Bases: lark.tree.Transformer

static arg_pair(s)[source]¶

static func(s)[source]¶

func_args¶: alias of __builtin__.list

static reference(s)[source]¶

static url(s)[source]¶

url_args¶: alias of __builtin__.list

brewtils.choices.parse(input_string, parse_as=None)[source]¶

Attempt to parse a string into a choices dictionary.

Parameters:	input_string – The string to parse parse_as – String specifying how to parse input_string. Valid values are ‘func’ or ‘url’. Will try all valid values if None.
Returns:	A dictionary containing the results of the parse
Raises:	lark.common.ParseError – The parser was not able to find a valid parsing of input_string

brewtils.decorators module¶

brewtils.decorators.system(cls)[source]¶

Class decorator that marks a class as a beer-garden System

Creates a _commands property on the class that holds all registered commands.

Parameters:	cls – The class to decorated
Returns:	The decorated class

brewtils.decorators.parameter(_wrapped=None, key=None, type=None, multi=None, display_name=None, optional=None, default=None, description=None, choices=None, nullable=None, maximum=None, minimum=None, regex=None, is_kwarg=None, model=None, form_input_type=None)[source]¶

Decorator that enables Parameter specifications for a beer-garden Command

This decorator is intended to be used when more specification is desired for a Parameter.

For example:

@parameter(key="message", description="Message to echo", optional=True, type="String",
           default="Hello, World!")
def echo(self, message):
    return message

Parameters:

_wrapped – The function to decorate. This is handled as a positional argument and shouldn’t be explicitly set.
key – String specifying the parameter identifier. Must match an argument name of the decorated function.
type – String indicating the type to use for this parameter.
multi – Boolean indicating if this parameter is a multi. See documentation for discussion of what this means.
display_name – String that will be displayed as a label in the user interface.
optional – Boolean indicating if this parameter must be specified.
default – The value this parameter will be assigned if not overridden when creating a request.
description – An additional string that will be displayed in the user interface.
choices – List or dictionary specifying allowed values. See documentation for more information.
nullable – Boolean indicating if this parameter is allowed to be null.
maximum – Integer indicating the maximum value of the parameter.
minimum – Integer indicating the minimum value of the parameter.
regex – String describing a regular expression constraint on the parameter.
is_kwarg – Boolean indicating if this parameter is meant to be part of the decorated function’s kwargs.
model – Class to be used as a model for this parameter. Must be a Python type object, not an instance.
form_input_type – Only used for string fields. Changes the form input field (e.g. textarea)

Returns:

The decorated function.

brewtils.decorators.command(_wrapped=None, command_type='ACTION', output_type='STRING', schema=None, form=None, template=None, icon_name=None, description=None)[source]¶

Decorator that marks a function as a beer-garden command

For example:

@command(output_type='JSON')
def echo_json(self, message):
    return message

Parameters:

_wrapped – The function to decorate. This is handled as a positional argument and shouldn’t be explicitly set.
command_type – The command type. Valid options are Command.COMMAND_TYPES.
output_type – The output type. Valid options are Command.OUTPUT_TYPES.
schema – A custom schema definition.
form – A custom form definition.
template – A custom template definition.
icon_name – The icon name. Should be either a FontAwesome or a Glyphicon name.
description – The command description. Will override the function’s docstring.

Returns:

The decorated function.

brewtils.decorators.command_registrar(cls)¶

Class decorator that marks a class as a beer-garden System

Creates a _commands property on the class that holds all registered commands.

Parameters:	cls – The class to decorated
Returns:	The decorated class

brewtils.decorators.plugin_param(_wrapped=None, key=None, type=None, multi=None, display_name=None, optional=None, default=None, description=None, choices=None, nullable=None, maximum=None, minimum=None, regex=None, is_kwarg=None, model=None, form_input_type=None)¶

Decorator that enables Parameter specifications for a beer-garden Command

This decorator is intended to be used when more specification is desired for a Parameter.

For example:

@parameter(key="message", description="Message to echo", optional=True, type="String",
           default="Hello, World!")
def echo(self, message):
    return message

Parameters:

_wrapped – The function to decorate. This is handled as a positional argument and shouldn’t be explicitly set.
key – String specifying the parameter identifier. Must match an argument name of the decorated function.
type – String indicating the type to use for this parameter.
multi – Boolean indicating if this parameter is a multi. See documentation for discussion of what this means.
display_name – String that will be displayed as a label in the user interface.
optional – Boolean indicating if this parameter must be specified.
default – The value this parameter will be assigned if not overridden when creating a request.
description – An additional string that will be displayed in the user interface.
choices – List or dictionary specifying allowed values. See documentation for more information.
nullable – Boolean indicating if this parameter is allowed to be null.
maximum – Integer indicating the maximum value of the parameter.
minimum – Integer indicating the minimum value of the parameter.
regex – String describing a regular expression constraint on the parameter.
is_kwarg – Boolean indicating if this parameter is meant to be part of the decorated function’s kwargs.
model – Class to be used as a model for this parameter. Must be a Python type object, not an instance.
form_input_type – Only used for string fields. Changes the form input field (e.g. textarea)

Returns:

The decorated function.

brewtils.decorators.register(_wrapped=None, command_type='ACTION', output_type='STRING', schema=None, form=None, template=None, icon_name=None, description=None)¶

Decorator that marks a function as a beer-garden command

For example:

@command(output_type='JSON')
def echo_json(self, message):
    return message

Parameters:

_wrapped – The function to decorate. This is handled as a positional argument and shouldn’t be explicitly set.
command_type – The command type. Valid options are Command.COMMAND_TYPES.
output_type – The output type. Valid options are Command.OUTPUT_TYPES.
schema – A custom schema definition.
form – A custom form definition.
template – A custom template definition.
icon_name – The icon name. Should be either a FontAwesome or a Glyphicon name.
description – The command description. Will override the function’s docstring.

Returns:

The decorated function.

brewtils.errors module¶

Module containing all of the BREWMASTER error definitions

exception brewtils.errors.AckAndContinueException[source]¶: Bases: exceptions.Exception

exception brewtils.errors.AckAndDieException[source]¶: Bases: exceptions.Exception

exception brewtils.errors.BGConflictError[source]¶

Bases: brewtils.errors.BrewmasterRestClientError

Error indicating a 409 was raised on the server

exception brewtils.errors.BGNotFoundError[source]¶

Bases: brewtils.errors.BrewmasterRestClientError

Error Indicating a 404 was raised on the server

exception brewtils.errors.BrewmasterConnectionError[source]¶

Bases: brewtils.errors.BrewmasterRestServerError

Error indicating a connection error while performing a request

exception brewtils.errors.BrewmasterDeleteError[source]¶

Bases: brewtils.errors.BrewmasterRestServerError

Error Indicating a server Error occurred performing a DELETE

exception brewtils.errors.BrewmasterFetchError[source]¶

Bases: brewtils.errors.BrewmasterRestError

Error Indicating a server Error occurred performing a GET

exception brewtils.errors.BrewmasterModelError[source]¶

Bases: exceptions.Exception

Wrapper Error for All BrewmasterModelErrors

exception brewtils.errors.BrewmasterModelValidationError[source]¶

Bases: brewtils.errors.BrewmasterModelError

Error to indicate an invalid Brewmaster Model

exception brewtils.errors.BrewmasterRestClientError[source]¶

Bases: brewtils.errors.BrewmasterRestError

Wrapper for all 4XX errors

exception brewtils.errors.BrewmasterRestError[source]¶

Bases: exceptions.Exception

Wrapper Error to Wrap more specific BREWMASTER Rest Errors

exception brewtils.errors.BrewmasterRestServerError[source]¶

Bases: brewtils.errors.BrewmasterRestError

Wrapper for all 5XX errors

exception brewtils.errors.BrewmasterSaveError[source]¶

Bases: brewtils.errors.BrewmasterRestServerError

Error Indicating a server Error occurred performing a POST/PUT

exception brewtils.errors.BrewmasterTimeoutError[source]¶

Bases: brewtils.errors.BrewmasterRestServerError

Error Indicating a Timeout was reached while performing a request

exception brewtils.errors.BrewmasterValidationError[source]¶

Bases: brewtils.errors.BrewmasterRestClientError

Error Indicating a client (400) Error occurred performing a POST/PUT

exception brewtils.errors.DiscardMessageException[source]¶

Bases: exceptions.Exception

Raising an instance will result in a message not being requeued

exception brewtils.errors.NoAckAndDieException[source]¶: Bases: exceptions.Exception

exception brewtils.errors.PluginError[source]¶

Bases: exceptions.Exception

Generic error class

exception brewtils.errors.PluginParamError[source]¶

Bases: brewtils.errors.PluginError

Error used when plugins have illegal parameters

exception brewtils.errors.PluginValidationError[source]¶

Bases: brewtils.errors.PluginError

Plugin could not be validated successfully

exception brewtils.errors.RepublishRequestException(request, headers)[source]¶

Bases: exceptions.Exception

Republish to the end of the message queue

Parameters:	request (`brewtils.models.Request`) – The Request to republish headers – A dictionary of headers to be used by brewtils.request_consumer.RequestConsumer

exception brewtils.errors.RequestProcessingError[source]¶: Bases: brewtils.errors.AckAndContinueException

exception brewtils.errors.RequestStatusTransitionError[source]¶

Bases: brewtils.errors.BrewmasterModelValidationError

Error to indicate an updated status was not a valid transition

brewtils.models module¶

class brewtils.models.Choices(type=None, display=None, value=None, strict=None, details=None)[source]¶

Bases: object

DISPLAYS = ('select', 'typeahead')¶

TYPES = ('static', 'url', 'command')¶

schema = 'ChoicesSchema'¶

class brewtils.models.Command(name, description=None, id=None, parameters=None, command_type=None, output_type=None, schema=None, form=None, template=None, icon_name=None, system=None)[source]¶

Bases: object

COMMAND_TYPES = ('ACTION', 'INFO', 'EPHEMERAL')¶

OUTPUT_TYPES = ('STRING', 'JSON', 'XML', 'HTML')¶

get_parameter_by_key(key)[source]¶

Given a Key, it will return the parameter (or None) with that key

Return parameter:
Parameters:	key –

has_different_parameters(parameters)[source]¶

Given a set of parameters, determines if the parameters provided differ from the parameters already defined on this command.

Parameters:	parameters –
Return boolean:

parameter_keys()[source]¶

Convenience Method for returning all the keys of this command’s parameters.

Return list_of_parameters:

schema = 'CommandSchema'¶

class brewtils.models.Event(name=None, payload=None, error=None, metadata=None, timestamp=None)[source]¶

Bases: object

schema = 'EventSchema'¶

class brewtils.models.Events[source]¶

Bases: enum.Enum

ALL_QUEUES_CLEARED = 15¶

BARTENDER_STARTED = 3¶

BARTENDER_STOPPED = 4¶

BREWVIEW_STARTED = 1¶

BREWVIEW_STOPPED = 2¶

INSTANCE_INITIALIZED = 8¶

INSTANCE_STARTED = 9¶

INSTANCE_STOPPED = 10¶

QUEUE_CLEARED = 14¶

REQUEST_COMPLETED = 7¶

REQUEST_CREATED = 5¶

REQUEST_STARTED = 6¶

SYSTEM_CREATED = 11¶

SYSTEM_REMOVED = 13¶

SYSTEM_UPDATED = 12¶

class brewtils.models.Instance(name=None, description=None, id=None, status=None, status_info=None, queue_type=None, queue_info=None, icon_name=None, metadata=None)[source]¶

Bases: object

INSTANCE_STATUSES = set(['UNKNOWN', 'DEAD', 'PAUSED', 'RUNNING', 'STOPPED', 'INITIALIZING', 'STOPPING', 'STARTING', 'UNRESPONSIVE'])¶

schema = 'InstanceSchema'¶

class brewtils.models.LoggingConfig(level=None, handlers=None, formatters=None, loggers=None)[source]¶

Bases: object

DEFAULT_FORMAT = '%(asctime)s - %(name)s - %(levelname)s - %(message)s'¶

DEFAULT_HANDLER = {'class': 'logging.StreamHandler', 'formatter': 'default', 'stream': 'ext::/sys.stdout'}¶

LEVELS = ('DEBUG', 'INFO', 'WARN', 'ERROR')¶

SUPPORTED_HANDLERS = ('stdout', 'file', 'logstash')¶

formatter_names¶

get_plugin_log_config(**kwargs)[source]¶

Get a specific plugin logging configuration.

It is possible for different systems to have different logging configurations. This method will create the correct plugin logging configuration and return it. If a specific logger is not found for a system, then the current logging configuration will be returned.

Parameters:	kwargs – Identifying information for a system (i.e. system_name)
Returns:

handler_names¶

schema = 'LoggingConfigSchema'¶

class brewtils.models.Parameter(key, type=None, multi=None, display_name=None, optional=None, default=None, description=None, choices=None, parameters=None, nullable=None, maximum=None, minimum=None, regex=None, form_input_type=None)[source]¶

Bases: object

FORM_INPUT_TYPES = ('textarea',)¶

TYPES = ('String', 'Integer', 'Float', 'Boolean', 'Any', 'Dictionary', 'Date', 'DateTime')¶

is_different(other)[source]¶

schema = 'ParameterSchema'¶

class brewtils.models.PatchOperation(operation=None, path=None, value=None)[source]¶

Bases: object

schema = 'PatchSchema'¶

class brewtils.models.Queue(name=None, system=None, version=None, instance=None, system_id=None, display=None, size=None)[source]¶

Bases: object

schema = 'QueueSchema'¶

class brewtils.models.Request(system=None, system_version=None, instance_name=None, command=None, id=None, parent=None, children=None, parameters=None, comment=None, output=None, output_type=None, status=None, command_type=None, created_at=None, error_class=None, metadata=None, updated_at=None)[source]¶

Bases: object

COMMAND_TYPES = ('ACTION', 'INFO', 'EPHEMERAL')¶

COMPLETED_STATUSES = ('CANCELED', 'SUCCESS', 'ERROR')¶

OUTPUT_TYPES = ('STRING', 'JSON', 'XML', 'HTML')¶

STATUS_LIST = ('CREATED', 'RECEIVED', 'IN_PROGRESS', 'CANCELED', 'SUCCESS', 'ERROR')¶

is_ephemeral¶

schema = 'RequestSchema'¶

status¶

class brewtils.models.System(name=None, description=None, version=None, id=None, max_instances=None, instances=None, commands=None, icon_name=None, display_name=None, metadata=None)[source]¶

Bases: object

get_command_by_name(command_name)[source]¶

Retrieve a particular command from the system

Parameters:	command_name – Name of the command to retrieve
Returns:	The command object. None if the given command name does not exist in this system.

get_instance(name)[source]¶

Get an instance that currently exists in the system

Parameters:	name – The name of the instance to search
Returns:	The instance with the given name exists for this system, None otherwise

has_different_commands(commands)[source]¶

Check if a set of commands is different than the current commands

Parameters:	commands – The set commands to compare against the current set
Returns:	True if the sets are different, False if the sets are the same

has_instance(name)[source]¶

Determine if an instance currently exists in the system

Parameters:	name – The name of the instance to search
Returns:	True if an instance with the given name exists for this system, False otherwise.

instance_names¶

schema = 'SystemSchema'¶

brewtils.plugin module¶

class brewtils.plugin.PluginBase(client, bg_host=None, bg_port=None, ssl_enabled=None, ca_cert=None, client_cert=None, system=None, name=None, description=None, version=None, icon_name=None, instance_name=None, logger=None, parser=None, multithreaded=None, metadata=None, max_concurrent=None, bg_url_prefix=None, **kwargs)[source]¶

Bases: object

A beer-garden Plugin.

This class represents a beer-garden Plugin - a continuously-running process that can receive and process Requests.

To work, a Plugin needs a Client instance - an instance of a class defining which Requests this plugin can accept and process. The easiest way to define a Client is by annotating a class with the @system decorator.

When creating a Plugin you can pass certain keyword arguments to let the Plugin know how to communicate with the beer-garden instance. These are:

bg_host

bg_port

ssl_enabled

ca_cert

client_cert

bg_url_prefix

A Plugin also needs some identifying data. You can either pass parameters to the Plugin or pass a fully defined System object (but not both). Note that some fields are optional:

PluginBase(name="Test", version="1.0.0", instance_name="default", description="A Test")

or:

the_system = System(name="Test",
                    version="1.0.0",
                    instance_name="default,
                    description="A Test")
PluginBase(system=the_system)

If passing parameters directly note that these fields are required:

name: Environment variable BG_NAME will be used if not specified
version: Environment variable BG_VERSION will be used if not specified
instance_name: Environment variable BG_INSTANCE_NAME will be used if not specified. ‘default’ will be used if not specified and loading from envirornment variable was unsuccessful

And these fields are optional:

description (Will use docstring summary line from Client if not specified)
icon_name
metadata
display_name

Plugins service requests using a concurrent.futures.ThreadPoolExecutor. The maximum number of threads available is controlled by the max_concurrent argument (the ‘multithreaded’ argument has been deprecated).

Warning

The default value for max_concurrent is 1. This means that a Plugin that invokes a Command on itself in the course of processing a Request will deadlock! If you intend to do this, please set max_concurrent to a value that makes sense and be aware that Requests are processed in separate thread contexts!

Parameters:

client – Instance of a class annotated with @system.
bg_host (str) – Hostname of a beer-garden.
bg_port (int) – Port beer-garden is listening on.
ssl_enabled (bool) – Whether to use SSL for beer-garden communication.
ca_cert – Certificate that issued the server certificate used by the beer-garden server.
client_cert – Certificate used by the server making the connection to beer-garden.
system – The system definition.
name – The system name.
description – The system description.
version – The system version.
icon_name – The system icon name.
instance_name (str) – The name of the instance.
logger (logging.Logger.) – A logger that will be used by the Plugin.
parser (brewtils.schema_parser.SchemaParser.) – The parser to use when communicating with beer-garden.
multithreaded (bool) – DEPRECATED Process requests in a separate thread.
worker_shutdown_timeout (int) – Time to wait during shutdown to finish processing.
metadata (dict) – Metadata specific to this plugin.
max_concurrent (int) – Maximum number of requests to process concurrently.
bg_url_prefix (str) – URL Prefix beer-garden is on.
display_name (str) – The display name to use for the system.
max_attempts (int) – Number of times to attempt updating the request before giving up (default -1 aka never).
max_timeout (int) – Maximum amount of time to wait before retrying to update a request.
starting_timeout (int) – Initial time to wait before the first retry.
max_instances (int) – Maximum number of instances allowed for the system.
ca_verify (bool) – Verify server certificate when making a request.

process_admin_message(message, headers)[source]¶

process_message(target, request, headers)[source]¶

Process a message. Intended to be run on an Executor.

Parameters:	target – The object to invoke received commands on. (self or self.client) request – The parsed Request object headers – Dictionary of headers from the brewtils.request_consumer.RequestConsumer
Returns:	None

process_request_message(message, headers)[source]¶

Processes a message from a RequestConsumer

Parameters:	message – A valid string-representation of a brewtils.models.Request headers – A dictionary of headers from the brewtils.request_consumer.RequestConsumer
Returns:	A concurrent.futures.Future

run()[source]¶

class brewtils.plugin.RemotePlugin(client, bg_host=None, bg_port=None, ssl_enabled=None, ca_cert=None, client_cert=None, system=None, name=None, description=None, version=None, icon_name=None, instance_name=None, logger=None, parser=None, multithreaded=None, metadata=None, max_concurrent=None, bg_url_prefix=None, **kwargs)[source]¶: Bases: brewtils.plugin.PluginBase

brewtils.request_consumer module¶

class brewtils.request_consumer.RequestConsumer(amqp_url, queue_name, on_message_callback, panic_event, logger=None, thread_name=None, **kwargs)[source]¶

Bases: threading.Thread

Consumer that will handle unexpected interactions with RabbitMQ.

If RabbitMQ closes the connection, it will reopen it. You should look at the output, as there are limited reasons why the connection may be closed, which usually are tied to permission related issues or socket timeouts.

If the channel is closed, it will indicate a problem with one of the commands that were issued and that should surface in the output as well.

Parameters:

amqp_url (str) – The AMQP url to connection with
queue_name (str) – The name of the queue to connect to
on_message_callback (func) – The function called to invoke message processing. Must return a Future.
panic_event (event) – An event to be set in the event of a catastrophic failure
logger (logging.Logger) – A configured logger
thread_name (str) – The name to use for this thread
max_connect_retries (int) – Number of connection retry attempts before failure. Default -1 (retry forever).
max_connect_backoff (int) – Maximum amount of time to wait between connection retry attempts. Default 30.
max_concurrent (int) – Maximum number of requests to process concurrently

close_channel()[source]¶: Call to close the channel cleanly by issuing the Channel.Close RPC command.

close_connection()[source]¶: This method closes the connection to RabbitMQ.

on_cancelok(unused_frame)[source]¶

Invoked when the queueing service acknowledges cancellation.

This method is invoked by pika when RabbitMQ acknowledges the cancellation of a consumer. At this point we will close the channel. This will invoke the on_channel_closed method once the channel has been closed, which will in-turn close the connection.

Parameters:	unused_frame (pika.frame.Method) – The Basic.CancelOK frame

on_channel_closed(channel, reply_code, reply_text)[source]¶

Invoekd when the queueing service unexpectedly closes the channle.

Invoked by pika when RabbitMQ unexpectedly closes the channel. Channels are usually closed if you attempt to do something that violates the protocol, such as re-declare an exchange or queue with different parameters. In this case, we’ll close the connection to shutdown the object.

Parameters:	channel (pika.channel.Channel) – The closed channel reply_code (int) – The numeric reason the channel was closed reply_text (str) – The text reason the channel was closed

on_channel_open(channel)[source]¶

This method is invoked by pika when the channel has been opened. The channel object is passed in so we can make use of it.

The exchange / queue binding should have already been set up so just start consuming.

Parameters:	channel (pika.channel.Channel) – The channel object

on_connection_closed(connection, reply_code, reply_text)[source]¶

Invoked when the connection is closed.

This method is invoked by pika when the connection to RabbitMQ is closed unexpectedly. Since it is unexpected, we will reconnect to RabbitMQ if it disconnects.

Parameters:	connection (pika.connection.Connection) – the closed connection object reply_code (int) – The server provided reply_code if given reply_text (basestring) – The server provided reply_text if given

on_connection_open(unused_connection)[source]¶

Invoked when the connection has been established.

This method is called by pika once the connection to RabbitMQ has been established. It passes the handle to the connection object in case we need it, but in this case, we’ll just mark it unused.

on_consumer_cancelled(method_frame)[source]¶

Invoked by pika when RabbitMQ sends a Basic.Cancel for a consumer receiving messages.

Parameters:	method_frame (pika.frame.Method) – The Basic.Cancel frame

on_message(channel, basic_deliver, properties, body)[source]¶

Invoked when a message is delivered from the queueing service.

Invoked by pika when a message is delivered from RabbitMQ. The channel is passed for your convenience. The basic_deliver object that is passed in carries the exchange, routing key, delivery tag and a redelivered flag for the message. the properties passed in is an instance of BasicProperties with the message properties and the body is the message that was sent.

Parameters:	channel (pika.channel.Channel) – The channel object basic_deliver (pika.Spec.Basic.Deliver) – basic_deliver method properties (pika.Spec.BasicProperties) – properties body (str\|unicode) – The message body

on_message_callback_complete(basic_deliver, future)[source]¶

Invoked when the future returned by _on_message_callback completes.

Parameters:	basic_deliver (pika.Spec.Basic.Deliver) – basic_deliver method future (concurrent.futures.Future) – Completed future
Returns:	None

open_channel()[source]¶

Opens a channel on the queueing service.

Open a new channel with RabbitMQ by issuing the Channel.Open RPC command. When RabbitMQ responds that the channel is open, the on_channel_open callback will be invoked by pika.

open_connection()[source]¶

Opens a connection to the queueing service.

This method connects to RabbitMQ, returning the connection handle. When the connection is established, the on_connection_open method will be invoked by pika.

Return type:	pika.SelectConnection

reconnect()[source]¶: Will be invoked by the IOLoop timer if the connection is closed.

run()[source]¶

Run the example consumer.

Creates a connection to the queueing service, then starts the IOLoop. The IOLoop will block and allow the SelectConnection to operate.

Returns:

start_consuming()[source]¶

Begin consuming messages from the queueing service.

This method sets up the consumer by first calling add_on_cancel_callback so that the object is notified if RabbitMQ cancels the consumer. It then issues the Basic.Consume RPC command which returns the consumer tag that is used to uniquely identify the consumer with RabbitMQ. We keep the value to use it when we want to cancel consuming. The on_message method is passed in as a callback pika will invoke when a message is fully received.

stop()[source]¶

Cleanly shutdown the connection.

Assumes the stop_consuming method has already been called. When the queueing service acknowledges the closure, the connection is closed which will end the RequestConsumer.

Returns:

stop_consuming()[source]¶: Stop consuming by sending the Basic.Cancel RPC command.

brewtils.schema_parser module¶

class brewtils.schema_parser.BrewmasterSchemaParser[source]¶: Bases: brewtils.schema_parser.SchemaParser

class brewtils.schema_parser.SchemaParser[source]¶

Bases: object

Serialize and deserialize Brewtils models

logger = <logging.Logger object>¶

classmethod parse_command(command, from_string=False, **kwargs)[source]¶

Convert raw JSON string or dictionary to a command model object

Parameters:	command – The raw input from_string – True if ‘command’ is a JSON string, False if a dictionary kwargs – Additional parameters to be passed to the Schema (e.g. many=True)
Returns:	A Command object

classmethod parse_event(event, from_string=False, **kwargs)[source]¶

Convert raw JSON string or dictionary to an event model object

Parameters:	event – The raw input from_string – True if ‘event’ is a JSON string, False if a dictionary kwargs – Additional parameters to be passed to the Schema (e.g. many=True)
Returns:	An Event object

classmethod parse_instance(instance, from_string=False, **kwargs)[source]¶

Convert raw JSON string or dictionary to an instance model object

Parameters:	instance – The raw input from_string – True if ‘instance’ is a JSON string, False if a dictionary kwargs – Additional parameters to be passed to the Schema (e.g. many=True)
Returns:	An Instance object

classmethod parse_logging_config(logging_config, from_string=False, **kwargs)[source]¶

Convert raw JSON string or dictionary to a logging config model object

Note: for our logging_config, many is _always_ set to False. We will always return a dict from this method.

Parameters:	logging_config – The raw input from_string – True if ‘logging_config’ is a JSON string, False if a dictionary kwargs – Additional parameters to be passed to the Schema (e.g. many=True)
Returns:	A LoggingConfig object

classmethod parse_parameter(parameter, from_string=False, **kwargs)[source]¶

Convert raw JSON string or dictionary to a parameter model object

Parameters:	parameter – The raw input from_string – True if ‘parameter’ is a JSON string, False if a dictionary kwargs – Additional parameters to be passed to the Schema (e.g. many=True)
Returns:	An Parameter object

classmethod parse_patch(patch, from_string=False, **kwargs)[source]¶

Convert raw JSON string or dictionary to a patch model object

Note: for our patches, many is _always_ set to True. We will always return a list from this method.

Parameters:	patch – The raw input from_string – True if ‘patch’ is a JSON string, False if a dictionary kwargs – Additional parameters to be passed to the Schema (e.g. many=True)
Returns:	A PatchOperation object

classmethod parse_queue(queue, from_string=False, **kwargs)[source]¶

Convert raw JSON string or dictionary to a queue model object

Parameters:	queue – The raw input from_string – True if ‘event’ is a JSON string, False if a dictionary kwargs – Additional parameters to be passed to the Schema (e.g. many=True)
Returns:	A Queue object

classmethod parse_request(request, from_string=False, **kwargs)[source]¶

Convert raw JSON string or dictionary to a request model object

Parameters:	request – The raw input from_string – True if ‘request’ is a JSON string, False if a dictionary kwargs – Additional parameters to be passed to the Schema (e.g. many=True)
Returns:	A Request object

classmethod parse_system(system, from_string=False, **kwargs)[source]¶

Convert raw JSON string or dictionary to a system model object

Parameters:	system – The raw input from_string – True if ‘system’ is a JSON string, False if a dictionary kwargs – Additional parameters to be passed to the Schema (e.g. many=True)
Returns:	A System object

classmethod serialize_command(command, to_string=True, **kwargs)[source]¶

Convert a command model into serialized form

Parameters:	command – The command object(s) to be serialized to_string – True to generate a JSON-formatted string, False to generate a dictionary kwargs – Additional parameters to be passed to the Schema (e.g. many=True)
Returns:	Serialized representation of command

classmethod serialize_event(event, to_string=True, **kwargs)[source]¶

Convert a logging config model into serialized form

Parameters:	event – The event object(s) to be serialized to_string – True to generate a JSON-formatted string, False to generate a dictionary kwargs – Additional parameters to be passed to the Schema (e.g. many=True)
Returns:	Serialized representation of event

classmethod serialize_instance(instance, to_string=True, **kwargs)[source]¶

Convert an instance model into serialized form

Parameters:	instance – The instance object(s) to be serialized to_string – True to generate a JSON-formatted string, False to generate a dictionary kwargs – Additional parameters to be passed to the Schema (e.g. many=True)
Returns:	Serialized representation of instance

classmethod serialize_logging_config(logging_config, to_string=True, **kwargs)[source]¶

Convert a logging config model into serialize form

Parameters:	logging_config – The logging config object(s) to be serialized to_string – True to generate a JSON-formatted string, False to generate a dictionary kwargs – Additional parameters to be passed to the Schema (e.g. many=True)
Returns:	Serialized representation of logging config

classmethod serialize_parameter(parameter, to_string=True, **kwargs)[source]¶

Convert a parameter model into serialized form

Parameters:	parameter – The parameter object(s) to be serialized to_string – True to generate a JSON-formatted string, False to generate a dictionary kwargs – Additional parameters to be passed to the Schema (e.g. many=True)
Returns:	Serialized representation of parameter

classmethod serialize_patch(patch, to_string=True, **kwargs)[source]¶

Convert a patch model into serialized form

Parameters:	patch – The patch object(s) to be serialized to_string – True to generate a JSON-formatted string, False to generate a dictionary kwargs – Additional parameters to be passed to the Schema (e.g. many=True)
Returns:	Serialized representation of patch

classmethod serialize_queue(queue, to_string=True, **kwargs)[source]¶

Convert a queue model into serialized form

Parameters:	queue – The queue object(s) to be serialized to_string – True to generate a JSON-formatted string, False to generate a dictionary kwargs – Additional parameters to be passed to the Schema (e.g. many=True)
Returns:	Serialized representation of queue

classmethod serialize_request(request, to_string=True, **kwargs)[source]¶

Convert a request model into serialized form

Parameters:	request – The request object(s) to be serialized to_string – True to generate a JSON-formatted string, False to generate a dictionary kwargs – Additional parameters to be passed to the Schema (e.g. many=True)
Returns:	Serialized representation of request

classmethod serialize_system(system, to_string=True, include_commands=True, **kwargs)[source]¶

Convert a system model into serialized form

Parameters:	system – The system object(s) to be serialized to_string – True to generate a JSON-formatted string, False to generate a dictionary include_commands – True if the system’s command list should be included kwargs – Additional parameters to be passed to the Schema (e.g. many=True)
Returns:	Serialized representation of system

brewtils.schemas module¶

class brewtils.schemas.BaseSchema(strict=True, **kwargs)[source]¶

Bases: marshmallow.schema.Schema

classmethod get_attribute_names()[source]¶

make_object(data)[source]¶

opts = <marshmallow.schema.SchemaOpts object>¶

class brewtils.schemas.ChoicesSchema(strict=True, **kwargs)[source]¶

Bases: brewtils.schemas.BaseSchema

opts = <marshmallow.schema.SchemaOpts object>¶

class brewtils.schemas.CommandSchema(strict=True, **kwargs)[source]¶

Bases: brewtils.schemas.BaseSchema

opts = <marshmallow.schema.SchemaOpts object>¶

class brewtils.schemas.DateTime(format='epoch', **kwargs)[source]¶

Bases: marshmallow.fields.DateTime

Class that adds methods for (de)serializing DateTime fields as an epoch

static from_epoch(epoch)[source]¶

static to_epoch(dt, localtime=False)[source]¶

class brewtils.schemas.EventSchema(strict=True, **kwargs)[source]¶

Bases: brewtils.schemas.BaseSchema

opts = <marshmallow.schema.SchemaOpts object>¶

class brewtils.schemas.InstanceSchema(strict=True, **kwargs)[source]¶

Bases: brewtils.schemas.BaseSchema

opts = <marshmallow.schema.SchemaOpts object>¶

class brewtils.schemas.LoggingConfigSchema(strict=True, **kwargs)[source]¶

Bases: brewtils.schemas.BaseSchema

opts = <marshmallow.schema.SchemaOpts object>¶

class brewtils.schemas.ParameterSchema(strict=True, **kwargs)[source]¶

Bases: brewtils.schemas.BaseSchema

opts = <marshmallow.schema.SchemaOpts object>¶

class brewtils.schemas.PatchSchema(strict=True, **kwargs)[source]¶

Bases: brewtils.schemas.BaseSchema

opts = <marshmallow.schema.SchemaOpts object>¶

unwrap_envelope(data, many)[source]¶

wrap_envelope(data, many)[source]¶

class brewtils.schemas.QueueSchema(strict=True, **kwargs)[source]¶

Bases: brewtils.schemas.BaseSchema

opts = <marshmallow.schema.SchemaOpts object>¶

class brewtils.schemas.RequestSchema(strict=True, **kwargs)[source]¶

Bases: brewtils.schemas.BaseSchema

opts = <marshmallow.schema.SchemaOpts object>¶

class brewtils.schemas.StatusInfoSchema(strict=True, **kwargs)[source]¶

Bases: brewtils.schemas.BaseSchema

opts = <marshmallow.schema.SchemaOpts object>¶

class brewtils.schemas.SystemSchema(strict=True, **kwargs)[source]¶

Bases: brewtils.schemas.BaseSchema

opts = <marshmallow.schema.SchemaOpts object>¶

brewtils.stoppable_thread module¶

class brewtils.stoppable_thread.StoppableThread(**kwargs)[source]¶

Bases: threading.Thread

Thread class with a stop() method. The thread itself has to check regularly for the stopped() condition.

stop()[source]¶: Sets the stop event

stopped()[source]¶: Determines if stop has been called yet.

wait(timeout=None)[source]¶: Delegate wait call to threading.Event

Module contents¶

brewtils.get_bg_connection_parameters(**kwargs)[source]¶

Parse the keyword arguments, search in the arguments, and environment for the values

Parameters:	kwargs –
Returns:

brewtils.get_bool_from_kwargs_and_env(key, env_name, **kwargs)[source]¶: Gets a boolean value defaults to True

brewtils.get_easy_client(**kwargs)[source]¶

Initialize an EasyClient using Environment variables as default values

Parameters:	kwargs – Options for configuring the EasyClient
Returns:	An EasyClient

brewtils.get_from_kwargs_or_env(key, env_names, default, **kwargs)[source]¶

Get a value from the kwargs provided or environment

Parameters:	key – Key to search in the keyword args env_names – Environment names to search default – The default if it is not found elsewhere kwargs – Keyword Arguments
Returns:

Contributing¶

Contributions are welcome, and they are greatly appreciated! Every little bit helps, and credit will always be given.

You can contribute in many ways:

Types of Contributions¶

Report Bugs¶

Report bugs at https://github.com/beer-garden/brewtils/issues.

If you are reporting a bug, please include:

Your operating system name and version.
Any details about your local setup that might be helpful in troubleshooting.
Detailed steps to reproduce the bug.

Fix Bugs¶

Look through the GitHub issues for bugs. Anything tagged with “bug” and “help wanted” is open to whoever wants to implement it.

Implement Features¶

Look through the GitHub issues for features. Anything tagged with “enhancement” and “help wanted” is open to whoever wants to implement it.

Write Documentation¶

Brewtils could always use more documentation, whether as part of the official Brewtils docs, in docstrings, or even on the web in blog posts, articles, and such.

Submit Feedback¶

The best way to send feedback is to file an issue at https://github.com/beer-garden/brewtils/issues.

If you are proposing a feature:

Explain in detail how it would work.
Keep the scope as narrow as possible, to make it easier to implement.
Remember that this is a volunteer-driven project, and that contributions are welcome :)

Get Started!¶

Ready to contribute? Here’s how to set up brewtils for local development.

Fork the brewtils repo on GitHub.

Clone your fork locally:

$ git clone git@github.com:your_name_here/brewtils.git

Install your local copy into a virtualenv. Assuming you have virtualenvwrapper installed, this is how you set up your fork for local development:
```
$ mkvirtualenv brewtils
$ cd brewtils/
$ python setup.py develop
```
Create a branch for local development:
```
$ git checkout -b name-of-your-bugfix-or-feature
```
Now you can make your changes locally.
When you’re done making changes, check that your changes pass flake8 and the tests, including testing other Python versions with tox:
```
$ flake8 brewtils test
$ nosetests
$ tox
```
To get flake8 and tox, just pip install them into your virtualenv.

Commit your changes and push your branch to GitHub:

$ git add .
$ git commit -m "Your detailed description of your changes."
$ git push origin name-of-your-bugfix-or-feature

Submit a pull request through the GitHub website.

Pull Request Guidelines¶

Before you submit a pull request, check that it meets these guidelines:

The pull request should include tests.
If the pull request adds functionality, the docs should be updated. Put your new functionality into a function with a docstring, and add the feature to the list in README.rst.
The pull request should work for Python 2.7, 3.5, and 3.6. Check https://travis-ci.org/beer-garden/brewtils/pull_requests and make sure that the tests pass for all supported Python versions.

Tips¶

To run a subset of tests:

$ nosetests test/models_test.py:SystemTest.test_instance_names

Credits¶

Development Leads¶

Logan Asher Jones <loganasherjones@gmail.com>
Matt Patrick

Contributors¶

None yet. Why not be the first?

Brewtils Changelog¶

2.3.3¶

Date: 3/20/18

Bug Fixes¶

Fixed issue (#39) to avoid possible infinite loops

2.3.2¶

Date: 3/7/18

Bug Fixes¶

Fixed issue with multi-instance remote plugins failing to initialize

2.3.1¶

Date: 2/22/18

New Features¶

Added description keyword argument to @command decorator

2.3.0¶

Date: 1/26/18

New Features¶

Added methods for interacting with the Queue API to RestClient and EasyClient
Clients and Plugins can now be configured to skip server certificate verification when making HTTPS requests
Timestamps now have true millisecond precision on platforms that support it
Added form_input_type to Parameter model
Plugins can now be stopped correctly by calling their _stop method
Added Event model

Bug Fixes¶

Plugins now additionally look for ca_cert and client_cert in BG_CA_CERT and BG_CLIENT_CERT

Other Changes¶

Better data integrity by only allowing certain Request status transitions

2.2.1¶

Date: 1/11/18

Bug Fixes¶

Nested requests that reference a different beer-garden no longer fail

2.2.0¶

Date: 10/23/17

New Features¶

Command descriptions can now be changed without updating the System version
Standardized Remote Plugin logging configuration
Added domain-specific language for dynamic choices configuration
Added metadata field to Instance model

Bug Fixes¶

Removed some default values from model __init__ functions
System descriptors (description, display name, icon name, metadata) now always updated during startup
Requests with output type ‘JSON’ will now have JSON error messages

Other changes¶

Added license file

2.1.1¶

Date: 8/25/17

New Features¶

Added updated_at field to Request model
SystemClient now allows specifying a client_cert
RestClient now reuses the same session for subsequent connections
SystemClient can now make non-blocking requests
RestClient and EasyClient now support PATCHing a System

Deprecations / Removals¶

multithreaded argument to PluginBase has been superseded by max_concurrent
These decorators are now deprecated - @command_registrar, instead use @system - @plugin_param, instead use @parameter - @register, instead use @command
These classes are now deprecated - BrewmasterSchemaParser, instead use SchemaParser - BrewmasterRestClient, instead use RestClient - BrewmasterEasyClient, instead use EasyClient - BrewmasterSystemClient, instead use SystemClient

Bug Fixes¶

Reworked message processing to remove the possibility of a failed request being stuck in IN_PROGRESS
Correctly handle custom form definitions with a top-level array
Smarter reconnect logic when the RabbitMQ connection fails

Other changes¶

Removed dependency on pyopenssl so there’s need to compile any Python extensions
Request processing now occurs inside of a ThreadPoolExecutor thread
Better serialization handling for epoch fields