PyCarol
Contents
Getting Started
Run pip install pycarol to install the latest stable version from PyPI. Documentation for the latest release is hosted on readthedocs.
This will install the minimal dependencies. To install pyCarol with the dataframes dependencies use
pip install pycarol[dataframe], or to install with dask+pipeline dependencies use pip install pycarol[pipeline,dask]
The options we have are: complete, dataframe, onlineapp, dask, pipeline
To install from source:
pip install -r requirements.txtto install the minimal requirements;pip install -e . ".[dev]"to install the minimal requirements + dev libs;pip install -e . ".[pipeline]"to install the minimal requirements + pipelines dependencies;pip install -e . ".[complete]"to install all dependencies;
Initializing pyCarol
Carol is the main object to access pyCarol and all Carol's APIs.
from pycarol import PwdAuth, Carol
carol = Carol(domain=TENANT_NAME, app_name=APP_NAME,
auth=PwdAuth(USERNAME, PASSWORD), organization=ORGANIZATION)where domain is the tenant name, app_name is the Carol's app name, if any, auth
is the authentication method to be used (using user/password in this case) and organization is the organization
one wants to connect. Carols's URL is build as www.ORGANIZATION.carol.ai/TENANT_NAME
It is also possible to initialize the object with a token generated via user/password. This is useful when creating an online app that interacts with Carol
from pycarol import PwdKeyAuth, Carol
carol = Carol(domain=TENANT_NAME, app_name=APP_NAME,
auth=PwdKeyAuth(pwd_auth_token), organization=ORGANIZATION)Using API Key
To use API keys instead of username and password:
from pycarol import ApiKeyAuth, Carol
carol = Carol(domain=DOMAIN,
app_name=APP_NAME,
auth=ApiKeyAuth(api_key=X_AUTH_KEY),
connector_id=CONNECTOR, organization=ORGANIZATION)In this case one changes the authentication method to ApiKeyAuth. Noticed that one needs to pass the connector_id
too. An API key is always associated to a connector ID.
It is possible to use pyCarol to generate an API key
from pycarol import PwdAuth, ApiKeyAuth, Carol
carol = Carol(domain=TENANT_NAME, app_name=APP_NAME, organization=ORGANIZATION,
auth=PwdAuth(USERNAME, PASSWORD), connector_id=CONNECTOR)
api_key = carol.issue_api_key()
print(f"This is a API key {api_key['X-Auth-Key']}")
print(f"This is the connector Id {api_key['X-Auth-ConnectorId']}")To get the details of the API key you can do:
details = carol.api_key_details(APIKEY, CONNECTORID)Finally, to revoke an API key:
carol.api_key_revoke(CONNECTORID)Good practice using token
Never write in plain text your password/API token in your application. Use environment variables. pyCarol can use environment variables automatically. When none parameter is passed to the Carol constructor pycarol will look for:
CAROLTENANTfor domainCAROLAPPNAMEfor app_nameCAROL_DOMAINfor environmentCAROLORGANIZATIONfor organizationCAROLAPPOAUTHfor authCAROLCONNECTORIDfor connector_idCAROLUSERfor carol user emailCAROLPWDfor user password.e.g., one can create a
.envfile like this:
CAROLAPPNAME=myApp
CAROLTENANT=myTenant
CAROLORGANIZATION=myOrganization
CAROLAPPOAUTH=myAPIKey
CAROLCONNECTORID=myConnectorand then
from pycarol import Carol
from dotenv import load_dotenv
load_dotenv(".env") #this will import these env variables to your execution.
carol = Carol()Ingesting data
From both Staging Tables and Data Models (CDS Layer)
Use this method when you need to read most of the records and columns from the source.
from pycarol import Carol, Staging
staging = Staging(Carol())
df = staging.fetch_parquet(
staging_name="execution_history",
connector_name="model"
)From both Staging Tables and Data Models (BQ Layer)
Use this method when you need to read only a subset of records and columns or when data transformation is needed.
from pycarol import BQ, Carol
bq = BQ(Carol())
query_str = "SELECT * FROM stg_connectorname_table_name"
results = bq.query(query_str)In case one needs a service account with access to BigQuery, the following code can be used:
from pycarol import Carol
from pycarol.bigquery import TokenManager
tm = TokenManager(Carol())
service_account = tm.get_token().service_accountAfter each execution of BQ.query, the BQ object will have an attribute called
job. This attribute is of type bigquery.job.query.QueryJob and may be useful for
monitoring/debug jobs.
PyCarol provides access to BigQuery Storage API also. It allows for much faster reading times, but with limited querying capabilities. For instance, only tables are readable, so 'ingestion_stg_model_deep_audit' is ok, but 'stg_model_deep_audit' is not (it is a view).
from pycarol import BQStorage, Carol
bq = BQStorage(Carol())
table_name = "ingestion_stg_model_deep_audit"
col_names = ["request_id", "version"]
restriction = "branch = '01'"
sample_size = 1000
df = bq.query(
table_name,
col_names,
row_restriction=restriction,
sample_percentage=sample_size,
return_dataframe=True
)From Data Models (RT Layer): Filter queries
Use this when you need low latency (only if RT layer is enabled).
from pycarol.filter import TYPE_FILTER, TERM_FILTER, Filter
from pycarol import Query
json_query = Filter.Builder() \
.must(TYPE_FILTER(value='ratings' + "Golden")) \
.must(TERM_FILTER(key='mdmGoldenFieldAndValues.userid.raw',value='123'))\
.build().to_json()
FIELDS_ITEMS = ['mdmGoldenFieldAndValues.mdmaddress.coordinates']
query = Query(carol, page_size=10, print_status=True, only_hits=True,
fields=FIELDS_ITEMS, max_hits=200).query(json_query).go()
query.resultsThe result will be 200 hits of the query json_query above, the pagination will be 10, that means in each response
there will be 10 records. The query will return only the fields set in FIELDS_ITEMS.
The parameter only_hits = True will make sure that only records into the path $hits.mdmGoldenFieldAndValues will return.
If one wants all the response use only_hits = False. Also, if your filter has an aggregation, one should use
only_hits = False and get_aggs=True, e.g.,
from pycarol import Query
from pycarol.filter import TYPE_FILTER, Filter, CARDINALITY
json_query = Filter.Builder() \
.must(TYPE_FILTER(value='datamodelname' + "Golden")) \
.aggregation(CARDINALITY(name='cardinality', params = ["mdmGoldenFieldAndValues.taxid.raw"], size=40))\
.build().to_json()
query = Query(carol, get_aggs=True, only_hits=False)
query.query(json_query).go()
query.resultsFrom Data Models (RT Layer): Named queries
from pycarol import Query
named_query = 'revenueHist' # named query name
params = {"bin":"1d","cnpj":"24386434000130"} #query parameters to send.
results = Query(carol).named(named_query, params=params).go().resultsIt is possible to use all the parameters used in the filter query, i.e., only_hits ,
save_results, etc. For more information for the possible input parameters check the docstring.
What if one does not remember the parameters for a given named query?
named_query = 'revenueHist' # named query name
Query(carol).named_query_params(named_query)
> {'revenueHist': ['*cnpj', 'dateFrom', 'dateTo', '*bin']} #Parameters starting by * are mandatory.Sending data
The first step to send data to Carol is to create a connector.
from pycarol import Connectors
connector_id = Connectors(carol).create(name='my_connector', label="connector_label", group_name="GroupName")
print(f"This is the connector id: {connector_id}")With the connector Id on hands we can create the staging schema and then create the staging table. Assuming we have a sample of the data we want to send.
from pycarol import Staging
json_ex = {"name":'Rafael',"email": {"type": "email", "email": '[email protected]'} }
staging = Staging(carol)
staging.create_schema(staging_name='my_stag', data = json_ex,
crosswalk_name= 'my_crosswalk' ,crosswalk_list=['name'],
connector_name='my_connector')The json schema will be in the variable schema.schema. The code above will create the following schema:
{
'mdmCrosswalkTemplate': {
'mdmCrossreference': {
'my_crosswalk': [
'name'
]
}
},
'mdmFlexible': 'false',
'mdmStagingMapping': {
'properties': {
'email': {
'properties': {
'email': {
'type': 'string'
},
'type': {
'type': 'string'
}
},
'type': 'nested'
},
'name': {
'type': 'string'
}
}
},
'mdmStagingType': 'my_stag'
}To send the data (assuming we have a json with the data we want to send).
from pycarol import Staging
json_ex = [{"name":'Rafael',"email": {"type": "email", "email": '[email protected]'} },
{"name":'Leandro',"email": {"type": "email", "email": '[email protected]'} },
{"name":'Joao',"email": {"type": "email", "email": '[email protected]'} },
{"name":'Marcelo',"email": {"type": "email", "email": '[email protected]'} }]
staging = Staging(carol)
staging.send_data(staging_name = 'my_stag', data = json_ex, step_size = 2,
connector_id=connectorId, print_stats = True)The parameter step_size says how many registers will be sent each time. Remember the the max size per payload is
5MB. The parameter data can be a pandas DataFrame.
OBS: It is not possible to create a mapping using pycarol. The Mapping has to be done via the UI
Logging
To log messages to Carol:
from pycarol import Carol, CarolHandler
import logging
logger = logging.getLogger(__name__)
logger.setLevel(logging.DEBUG)
carol = CarolHandler(Carol())
carol.setLevel(logging.INFO)
logger.addHandler(carol)
logger.debug('This is a debug message') #This will not be logged in Carol. Level is set to INFO
logger.info('This is an info message')
logger.warning('This is a warning message')
logger.error('This is an error message')
logger.critical('This is a critical message')These methods will use the current long task id provided by Carol when running your application. For local environments you need to set that manually first on the beginning of your code:
import os
os.environ['LONGTASKID'] = task_idWe recommend to log only INFO+ information in Carol. If no TASK ID is passed it works as a Console Handler.
Settings
We can use pyCarol to access the settings of your Carol App.
from pycarol.apps import Apps
app = Apps(carol)
settings = app.get_settings(app_name='my_app')
print(settings)The settings will be returned as a dictionary where the keys are the parameter names and the values are the value for that parameter. Please note that your app must be created in Carol.
Useful Functions
track_tasks: Track a list of tasks.
from pycarol import Carol
from pycarol.functions import track_tasks
carol = Carol()
def callback(task_list):
print(task_list)
track_tasks(carol=carol, task_list=['task_id_1', 'task_id_2'], callback=callback)Release process
- Open a PR with your change for master branch;
- Once approved, merge into master;
- In case there are any changes to the default release notes, please update them
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