Resources reference#

Resource model#

The models defined in this file represent the resource JSON description format and provide a layer of abstraction from the raw JSON. The advantages of this are:

Pythonic interface (e.g. action.request.operation)
Consumers need not change for minor JSON changes (e.g. renamed field)

These models are used both by the resource factory to generate resource classes as well as by the documentation generator.

class boto3.resources.model.Action(name, definition, resource_defs)[source]#

A service operation action.

Parameters:

name (string) – The name of the action
definition (dict) – The JSON definition
resource_defs (dict) – All resources defined in the service

name#: (string) The name of the action

path#: (string) The JMESPath search path or None

request#: (Request) This action’s request or None

resource#: (ResponseResource) This action’s resource or None

class boto3.resources.model.Collection(name, definition, resource_defs)[source]#

A group of resources. See Action.

Parameters:

name (string) – The name of the collection
definition (dict) – The JSON definition
resource_defs (dict) – All resources defined in the service

property batch_actions#

Get a list of batch actions supported by the resource type contained in this action. This is a shortcut for accessing the same information through the resource model.

Return type:: list(Action)

name#: (string) The name of the action

path#: (string) The JMESPath search path or None

request#: (Request) This action’s request or None

resource#: (ResponseResource) This action’s resource or None

class boto3.resources.model.DefinitionWithParams(definition)[source]#

An item which has parameters exposed via the params property. A request has an operation and parameters, while a waiter has a name, a low-level waiter name and parameters.

Parameters:: definition (dict) – The JSON definition

property params#

Get a list of auto-filled parameters for this request.

Type:: list(Parameter)

class boto3.resources.model.Identifier(name, member_name=None)[source]#

A resource identifier, given by its name.

Parameters:: name (string) – The name of the identifier

name#: (string) The name of the identifier

class boto3.resources.model.Parameter(target, source, name=None, path=None, value=None, **kwargs)[source]#

An auto-filled parameter which has a source and target. For example, the QueueUrl may be auto-filled from a resource’s url identifier when making calls to queue.receive_messages.

Parameters:

target (string) – The destination parameter name, e.g. QueueUrl
source_type (string) – Where the source is defined.
source (string) – The source name, e.g. Url

name#: (string) The name of the source, if given

path#: (string) The JMESPath query of the source

source#: (string) Where the source is defined

target#: (string) The destination parameter name

value#: (string|int|float|bool) The source constant value

class boto3.resources.model.Request(definition)[source]#

A service operation action request.

Parameters:: definition (dict) – The JSON definition

operation#: (string) The name of the low-level service operation

property params#

Get a list of auto-filled parameters for this request.

Type:: list(Parameter)

class boto3.resources.model.ResourceModel(name, definition, resource_defs)[source]#

A model representing a resource, defined via a JSON description format. A resource has identifiers, attributes, actions, sub-resources, references and collections. For more information on resources, see Resources.

Parameters:

name (string) – The name of this resource, e.g. sqs or Queue
definition (dict) – The JSON definition
resource_defs (dict) – All resources defined in the service

property actions#

Get a list of actions for this resource.

Type:: list(Action)

property batch_actions#

Get a list of batch actions for this resource.

Type:: list(Action)

property collections#

Get a list of collections for this resource.

Type:: list(Collection)

get_attributes(shape)[source]#

Get a dictionary of attribute names to original name and shape models that represent the attributes of this resource. Looks like the following:

{
‘some_name’: (‘SomeName’, <Shape…>)

}

Parameters:: shape (botocore.model.Shape) – The underlying shape for this resource.
Return type:: dict
Returns:: Mapping of resource attributes.

property identifiers#

Get a list of resource identifiers.

Type:: list(Identifier)

property load#

Get the load action for this resource, if it is defined.

Type:: Action or None

load_rename_map(shape=None)[source]#

Load a name translation map given a shape. This will set up renamed values for any collisions, e.g. if the shape, an action, and a subresource all are all named foo then the resource will have an action foo, a subresource named Foo and a property named foo_attribute. This is the order of precedence, from most important to least important:

Load action (resource.load)
Identifiers
Actions
Subresources
References
Collections
Waiters
Attributes (shape members)

Batch actions are only exposed on collections, so do not get modified here. Subresources use upper camel casing, so are unlikely to collide with anything but other subresources.

Creates a structure like this:

renames = {
    ('action', 'id'): 'id_action',
    ('collection', 'id'): 'id_collection',
    ('attribute', 'id'): 'id_attribute'
}

# Get the final name for an action named 'id'
name = renames.get(('action', 'id'), 'id')

Parameters:: shape (botocore.model.Shape) – The underlying shape for this resource.

name#: (string) The name of this resource

property references#

Get a list of reference resources.

Type:: list(Action)

shape#: (string) The service shape name for this resource or None

property subresources#

Get a list of sub-resources.

Type:: list(Action)

property waiters#

Get a list of waiters for this resource.

Type:: list(Waiter)

class boto3.resources.model.ResponseResource(definition, resource_defs)[source]#

A resource response to create after performing an action.

Parameters:

definition (dict) – The JSON definition
resource_defs (dict) – All resources defined in the service

property identifiers#

A list of resource identifiers.

Type:: list(Identifier)

property model#

Get the resource model for the response resource.

Type:: ResourceModel

path#: (string) The JMESPath search query or None

type#: (string) The name of the response resource type

class boto3.resources.model.Waiter(name, definition)[source]#

An event waiter specification.

Parameters:

name (string) – Name of the waiter
definition (dict) – The JSON definition

PREFIX = 'WaitUntil'#

name#: (string) The name of this waiter

property params#

Get a list of auto-filled parameters for this request.

Type:: list(Parameter)

waiter_name#: (string) The name of the underlying event waiter

Request parameters#

boto3.resources.params.build_param_structure(params, target, value, index=None)[source]#

This method provides a basic reverse JMESPath implementation that lets you go from a JMESPath-like string to a possibly deeply nested object. The params are mutated in-place, so subsequent calls can modify the same element by its index.

>>> build_param_structure(params, 'test[0]', 1)
>>> print(params)
{'test': [1]}

>>> build_param_structure(params, 'foo.bar[0].baz', 'hello world')
>>> print(params)
{'test': [1], 'foo': {'bar': [{'baz': 'hello, world'}]}}

boto3.resources.params.create_request_parameters(parent, request_model, params=None, index=None)[source]#

Handle request parameters that can be filled in from identifiers, resource data members or constants.

By passing params, you can invoke this method multiple times and build up a parameter dict over time, which is particularly useful for reverse JMESPath expressions that append to lists.

Parameters:

parent (ServiceResource) – The resource instance to which this action is attached.
request_model (Request) – The action request model.
params (dict) – If set, then add to this existing dict. It is both edited in-place and returned.
index (int) – The position of an item within a list

Return type:

dict

Returns:

Pre-filled parameters to be sent to the request operation.

boto3.resources.params.get_data_member(parent, path)[source]#

Get a data member from a parent using a JMESPath search query, loading the parent if required. If the parent cannot be loaded and no data is present then an exception is raised.

Parameters:

parent (ServiceResource) – The resource instance to which contains data we are interested in.
path (string) – The JMESPath expression to query

Raises:

ResourceLoadException – When no data is present and the resource cannot be loaded.

Returns:

The queried data or None.

Response handlers#

class boto3.resources.response.RawHandler(search_path)[source]#

A raw action response handler. This passed through the response dictionary, optionally after performing a JMESPath search if one has been defined for the action.

Parameters:: search_path (string) – JMESPath expression to search in the response
Return type:: dict
Returns:: Service response

class boto3.resources.response.ResourceHandler(search_path, factory, resource_model, service_context, operation_name=None)[source]#

Creates a new resource or list of new resources from the low-level response based on the given response resource definition.

Parameters:

search_path (string) – JMESPath expression to search in the response
factory (ResourceFactory) – The factory that created the resource class to which this action is attached.
resource_model (ResponseResource) – Response resource model.
service_context (ServiceContext) – Context about the AWS service
operation_name (string) – Name of the underlying service operation, if it exists.

Return type:

ServiceResource or list

Returns:

New resource instance(s).

handle_response_item(resource_cls, parent, identifiers, resource_data)[source]#

Handles the creation of a single response item by setting parameters and creating the appropriate resource instance.

Parameters:

resource_cls (ServiceResource subclass) – The resource class to instantiate.
parent (ServiceResource) – The resource instance to which this action is attached.
identifiers (dict) – Map of identifier names to value or values.
resource_data (dict or None) – Data for resource attributes.

Return type:

ServiceResource

Returns:

New resource instance.

boto3.resources.response.all_not_none(iterable)[source]#: Return True if all elements of the iterable are not None (or if the iterable is empty). This is like the built-in all, except checks against None, so 0 and False are allowable values.

boto3.resources.response.build_empty_response(search_path, operation_name, service_model)[source]#

Creates an appropriate empty response for the type that is expected, based on the service model’s shape type. For example, a value that is normally a list would then return an empty list. A structure would return an empty dict, and a number would return None.

Parameters:

search_path (string) – JMESPath expression to search in the response
operation_name (string) – Name of the underlying service operation.
service_model (botocore.model.ServiceModel) – The Botocore service model

Return type:

dict, list, or None

Returns:

An appropriate empty value

boto3.resources.response.build_identifiers(identifiers, parent, params=None, raw_response=None)[source]#

Builds a mapping of identifier names to values based on the identifier source location, type, and target. Identifier values may be scalars or lists depending on the source type and location.

Parameters:

identifiers (list) – List of Parameter definitions
parent (ServiceResource) – The resource instance to which this action is attached.
params (dict) – Request parameters sent to the service.
raw_response (dict) – Low-level operation response.

Return type:

list

Returns:

An ordered list of (name, value) identifier tuples.

Resource actions#

class boto3.resources.action.BatchAction(action_model, factory=None, service_context=None)[source]#

An action which operates on a batch of items in a collection, typically a single page of results from the collection’s underlying service operation call. For example, this allows you to delete up to 999 S3 objects in a single operation rather than calling .delete() on each one individually.

Parameters:

action_model (:py:class`~boto3.resources.model.Action`) – The action model.
factory (ResourceFactory) – The factory that created the resource class to which this action is attached.
service_context (ServiceContext) – Context about the AWS service

class boto3.resources.action.CustomModeledAction(action_name, action_model, function, event_emitter)[source]#

A custom, modeled action to inject into a resource.

Parameters:

action_name (str) – The name of the action to inject, e.g. ‘delete_tags’
action_model (dict) – A JSON definition of the action, as if it were part of the resource model.
function (function) – The function to perform when the action is called. The first argument should be ‘self’, which will be the resource the function is to be called on.
event_emitter (botocore.hooks.BaseEventHooks) – The session event emitter.

inject(class_attributes, service_context, event_name, **kwargs)[source]#

class boto3.resources.action.ServiceAction(action_model, factory=None, service_context=None)[source]#

A class representing a callable action on a resource, for example sqs.get_queue_by_name(...) or s3.Bucket('foo').delete(). The action may construct parameters from existing resource identifiers and may return either a raw response or a new resource instance.

Parameters:

action_model (:py:class`~boto3.resources.model.Action`) – The action model.
factory (ResourceFactory) – The factory that created the resource class to which this action is attached.
service_context (ServiceContext) – Context about the AWS service

class boto3.resources.action.WaiterAction(waiter_model, waiter_resource_name)[source]#

A class representing a callable waiter action on a resource, for example s3.Bucket('foo').wait_until_bucket_exists(). The waiter action may construct parameters from existing resource identifiers.

Parameters:

waiter_model (:py:class`~boto3.resources.model.Waiter`) – The action waiter.
waiter_resource_name (string) – The name of the waiter action for the resource. It usually begins with a wait_until_

Resource base#

class boto3.resources.base.ResourceMeta(service_name, identifiers=None, client=None, data=None, resource_model=None)[source]#

An object containing metadata about a resource.

client#: (BaseClient) Low-level Botocore client

copy()[source]#: Create a copy of this metadata object.

data#: (dict) Loaded resource data attributes

identifiers#: (list) List of identifier names

service_name#: (string) The service name, e.g. ‘s3’

class boto3.resources.base.ServiceResource(*args, **kwargs)[source]#

A base class for resources.

Parameters:: client (botocore.client) – A low-level Botocore client instance

meta = None#

Stores metadata about this resource instance, such as the service_name, the low-level client and any cached data from when the instance was hydrated. For example:

# Get a low-level client from a resource instance
client = resource.meta.client
response = client.operation(Param='foo')

# Print the resource instance's service short name
print(resource.meta.service_name)

See ResourceMeta for more information.

Resource factory#

class boto3.resources.factory.ResourceFactory(emitter)[source]#

A factory to create new ServiceResource classes from a ResourceModel. There are two types of lookups that can be done: one on the service itself (e.g. an SQS resource) and another on models contained within the service (e.g. an SQS Queue resource).

load_from_definition(resource_name, single_resource_json_definition, service_context)[source]#

Loads a resource from a model, creating a new ServiceResource subclass with the correct properties and methods, named based on the service and resource name, e.g. EC2.Instance.

Parameters:

resource_name (string) – Name of the resource to look up. For services, this should match the service_name.
single_resource_json_definition (dict) – The loaded json of a single service resource or resource definition.
service_context (ServiceContext) – Context about the AWS service

Return type:

Subclass of ServiceResource

Returns:

The service or resource class.