py-sc-client

The python implementation of the client for communication with sc-server. This module is compatible with 0.6.0 - 0.6.1 versions of sc-machine.

Installing py-sc-client

py-sc-client is available on PyPI:

$ pip install py-sc-client

py-sc-client officially supports Python 3.8+.

API Reference

connect

Connect to the server by the URL. Run the client in another thread.

Parameters: A URL of the sc-server as a string.

from sc_client import client

client.connect("ws://localhost:8090/ws_json")

disconnect

Close the connection with the sc-server.

from sc_client import client

client.disconnect()

is_connected

Check the state of the connection with the sc-server.

Returns: The boolean value (true if a connection is established).

from sc_client import client

client.is_connected() # True

check_elements

Check the type of given elements.

Parameters: ScAddr class objects. Returns: A list of ScType class objects.

elem_types = client.check_elements(node_addr, edge_addr, link_addr)
elem_types[0].is_node() #True
elem_types[1].is_edge() #True
elem_types[2].is_link() #True

create_elements

Create a given construction in the KB memory.

Parameters: An ScConstruction class object. Returns: A list of ScAddr class objects.

const = ScConstruction()
const.create_node(sc_types.NODE_CONST, 'node')
link_content = ScLinkContent("Hello!", ScLinkContentType.STRING.value)
const.create_link(sc_types.LINK_CONST, link_content, 'link')
const.create_edge(sc_types.EDGE_ACCESS_CONST_POS_PERM, 'node', 'link')
addr_list = client.create_elements(const)
addr_list # [node_addr, link_addr, edge_addr]

delete_elements

Delete elements from the KB memory.

Parameters: ScAddr class objects. Returns: The boolean value (true if elements were deleted).

status = client.delete_elements(node_addr, edge_addr, link_addr)
status #True

set_link_contents

Set the new content to corresponding links.

Parameters: ScLinkContent class objects. Returns: The boolean value (true if the link content is set).

link_content = ScLinkContent("Hello world!", ScLinkContentType.STRING.value)
link_content.addr = link_addr
status = client.set_link_contents(link_content)
status # True

get_link_content

Get the content of the given link.

Parameters: An ScAddr class object. Returns: A list of ScLinkContent class objects.

link_content = client.get_link_content(link_addr)
link_content[0].data # link content
link_content[0].addr # link addr

get_links_by_content

Get links from the KB with content.

Parameters: ScLinkContent class objects, strings. Returns: A list of lists of ScAddr class objects.

content = client.get_links_by_content("testing search by the link content as a string", "no content")
content[0]  # get a list of ScAddrs links with the given content
content[1]  # get an empty list if there is no link with the given content in the memory

resolve_keynodes

Get a keynode from the KB memory by identifier and type. If it doesn't exist, then create a new one. If ScType is None, try to find an element by the system identifier.

Parameters: An ScIdtfResolveParams class object. Returns: A list of ScAddr class objects.

params = ScIdtfResolveParams(idtf='my_new_keynode_that_not_exist', type=sc_types.NODE_CONST)
addr = client.resolve_keynodes([params])
addr # list with new keynode addr

params = ScIdtfResolveParams(idtf='technology_OSTIS', type=sc_types.NODE_CONST)
addr = client.resolve_keynodes([params])
addr # list with keynode addr

params = ScIdtfResolveParams(idtf='my_another_keynode_that_not_exist', type=None)
addr = client.resolve_keynodes([params])
addr # list with invalid addr

params = ScIdtfResolveParams(idtf='nrel_format', type=None)
addr = client.resolve_keynodes([params])
addr # list with keynode addr

template_search

Search in the KB memory by template.

Parameters: An ScTemplate class object or an scs-template as a string. Returns: A list of ScTemplateResult class objects.

templ = ScTemplate()
templ.triple([class_node_addr, '_class_node'], sc_types.EDGE_ACCESS_VAR_POS_PERM, node_addr) # faf
templ.triple('_class_node', sc_types.EDGE_ACCESS_VAR_POS_TEMP, link_addr) # faf
templ.triple('_class_node', edge_addr, sc_types.NODE_VAR) # ffa
templ.triple(node_addr, edge_addr, sc_types.NODE_VAR) # ffa
search_results = client.template_search(templ)
search_result = search_results[0]

search_result.size() # count of elements in the resulting construction
search_result.get(0).value # get an element from the result by index
search_result.get('_class_node').value # get an element from the result by alias

def for_each_tripple_func(src: ScAddr, edge: ScAddr, trg: ScAddr):
    ...
search_result.for_each_triple(for_each_tripple_func) # call a function for each triple in the result

template_generate

Generate a construction in the KB memory by template.

Parameters: An ScTemplate class object or an scs-template as a string, an ScTemplateGenParams class object. Returns: An ScTemplateResult class object.

templ = ScTemplate()
templ.triple_with_relation( # faaaf
    [main_node, '_main_node'],
    sc_types.EDGE_D_COMMON_VAR,
    [sc_types.LINK_VAR, '_link'],
    sc_types.EDGE_ACCESS_VAR_POS_PERM,
    relation_node,
)
templ.triple( # faa
    '_main_node',
    sc_types.EDGE_ACCESS_VAR_POS_TEMP,
    [sc_types.NODE_VAR, '_var_node']
)
gen_params = {'_link': link_node, '_var_node': var_node}
gen_result = client.template_generate(templ, gen_params)

events_create

Create an event in the KB memory.

Parameters: ScEventParams class objects. Returns: A list of ScEvent class objects.

def event_callback(src: ScAddr, edge: ScAddr, trg: ScAddr):
    ...

event_type = common.ScEventType.ADD_OUTGOING_EDGE
event_params = ScEventParams(bounded_elem_addr, event_type, event_callback)
sc_event = client.events_create(event_params)

is_event_valid

Check whether an event is active or not.

Parameters: An ScEvent class object. Returns: The boolean value (true if an event is valid).

status = client.is_event_valid(sc_event)
status # True

events_destroy

Destroy an event in the KB memory.

Parameters: ScEvent class objects. Returns: The boolean value (true if an event was destroyed).

status = client.events_destroy(sc_event)
status # true

Classes

The library contains the python implementation of useful classes and functions to work with the sc-memory.

There is a list of classes:

ScKeynodes
ScAgent
ScModule

ScKeynodes

A singleton dictionary object which provides the ability to cache the identifier and ScAddr of keynodes stored in the KB. Create an instance of the ScKeynodes class to get access to the cache:

keynodes = ScKeynodes()

Get the provided identifier:

keynodes["identifier_of_keynode"] # returns an ScAddr of the given identifier
keynodes["not_stored_in_kb"] # returns an invalid ScAddr if an identifier does not exist in the memory

Use resolve_identifiers() to upload identifiers from Enum classes:

class CommonIdentifiers(Enum):
    RREL_ONE = "rrel_1"
    RREL_TWO = "rrel_2"

class QuestionStatus(Enum):
    QUESTION_INITIATED = "question_initiated"
    QUESTION_FINISHED = "question_finished"
    QUESTION_FINISHED_SUCCESSFULLY = "question_finished_successfully"
    QUESTION_FINISHED_UNSUCCESSFULLY = "question_finished_unsuccessfully"

keynodes.resolve_identifiers([QuestionStatus, CommonIdentifiers])

ScAgent

A class for handling a single ScEvent. Define your agents like this:

class MyAgent(ScAgent):
    action = "Identifier_of_action_class"

    def register(self) -> ScEvent:
        # override method, must return an ScEvent instance
        params = [
            MyAgent.keynodes["action_initiated"],
            common.ScEventType.ADD_OUTGOING_EDGE,
            MyAgent.run_impl
        ]
        event_params = ScEventParams(*params)
        sc_event = client.events_create(event_params)
        return sc_event[0]

    @staticmethod
    def run_impl(action_class: ScAddr, edge: ScAddr, action_node: ScAddr) -> None:
        # override method, must have 3 args and be static
        ...

ScModule

A class for handling a multiple ScAgent. Define your modules like this:

class MyModule(ScModule):
    def __init__(self) -> None:
        agents_to_register = [MyAgent1, MyAgent2] # list of agent classes
        super().__init__(agents_to_register)

rudi-kit/py-sc-client