PumpWood Communication

This package facilitates communication with PumpWood-pattern endpoints and helps with authentication. It was developed by Murabei Data Science and is under the BSD-3-Clause license.

Pumpwood is a native Brazilian tree which has a symbiotic relation with ants (Murabei)

Objective and motivation

Python client library for PumpWood-style REST backends: login, CRUD, actions, batch and parallel calls, disk cache, and typed exceptions.

Why this exists

PumpWood services share a common endpoint layout (rest/<model>/…). This package centralizes HTTP calls, auth token handling, error rehydration, and parallel chunking so workers and scripts do not reimplement that wiring.

How it is used

Import PumpWoodMicroService, configure server_url and credentials, call login(), then use list, save, retrieve, delete, and action helpers from workers, ETL jobs, notebooks, or other Murabei services.

Scope

Owns the HTTP client, serializers, cache, and exception mapping. Backend business rules, models, and deploy live in PumpWood API services. See the generated docs for the full method list.

Documentation

Check the documentation page here.

Install

Requires Python 3.6 or newer (requires-python in pyproject.toml).

pip install pumpwood-communication

For local development, install from the repository root with Poetry or pip in editable mode.

Quick start

The main class in the package is PumpWoodMicroService. It abstracts all endpoint communication using helper methods. Set credentials when initializing the object or afterward with init.

from pumpwood_communication.microservices import PumpWoodMicroService

microservice = PumpWoodMicroService(
    server_url="http://0.0.0.0:8080/",
    username="pumpwood", password="pumpwood")
microservice.login()

Sometimes it is easier to create the object first and set credentials later with init:

from pumpwood_communication.microservices import PumpWoodMicroService

microservice = PumpWoodMicroService()

# After many validations or other functions
[...]

microservice.init(
    server_url="http://0.0.0.0:8080/",
    username="pumpwood", password="pumpwood")
microservice.login()

PumpWoodMicroService constructor and init accept these parameters:

• name: Microservice name for debug purposes only; does not affect usage.
• server_url: Server URL using the PumpWood pattern.
• username: Username for the connection.
• password: Password for the connection.
• verify_ssl: In some test environments the endpoint may use a self-assigned certificate.

Basic definition

These concepts help understand the general structure of PumpWood-based endpoints.

PumpWood endpoints are organized by model_class, the class exposed through the PumpWood API. Every object has its own primary key, returned as pk in JSON responses regardless of the database column name (pk may map to id or identification_id in the DB).

All endpoints for a given model_class follow rest/[model_class]/[endpoint]/[?pk]&[query parameters]. Examples:

• [POST] rest/user/list/
• [POST] rest/user/list-without-pag/
• [POST] rest/user/save/
• [GET] rest/user/retrieve/5/
• [POST] rest/company/save/
• [POST] rest/company/actions/duplicate/5/
• [GET] rest/company/actions/

Raise and error treatment

When a PumpWood exception is identified in the request response, the microservice re-raises it using the same exception type. This helps debugging and propagating errors across endpoints.

Exceptions defined in the package can be raised directly:

from pumpwood_communication.exceptions import PumpWoodException

raise PumpWoodException(
  message="Error to be mapped using the APIs",
  payload={
      "payload": "payload-data"
  })

Base query filters and superuser

Many endpoints accept base_filter_skip to skip backend base query filters (row-level restrictions). When the argument is omitted:

• Superusers (after login) default to ['ALL'].
• Other users default to [] (no filters skipped).

Superuser status comes from the user object returned at login and stored on the microservice instance. Explicit values are always passed through unchanged.

logout and logout_all clear the cached user, token, and auth header so is_superuser() and base_filter_skip defaults reset correctly.

Environment variables

Correct spelling is PUMPWOOD_COMMUNICATION__*. Legacy typo spelling PUMPWOOD_COMUNICATION__* is still supported as fallback when the correct name is not set.

Parallel and requests

• PUMPWOOD_COMMUNICATION__N_PARALLEL: Number of parallel requests. Default 4.
• PUMPWOOD_COMMUNICATION__PARALLEL_CHUNK_SIZE: Chunk size for parallel bulk save. Default 10000.
• PUMPWOOD_COMMUNICATION__DEFAULT_TIMEOUT: Default HTTP request timeout in seconds. Default 60.
• PUMPWOOD_COMMUNICATION__DEBUG: Refresh token on each request when TRUE. Default FALSE.
• PUMPWOOD_COMMUNICATION__VERIFY_SSL: Validate server certificates when TRUE. Default TRUE.

Cache

• PUMPWOOD_COMMUNICATION__CACHE_ENABLE: Enable disk cache. Default TRUE.
• PUMPWOOD_COMMUNICATION__CACHE_BASE_PATH: Sub-path under /tmp/pumpwood_cache/. Default empty string.
• PUMPWOOD_COMMUNICATION__CACHE_LIMIT_MB: Disk cache size limit in megabytes. Default 250.
• PUMPWOOD_COMMUNICATION__CACHE_DEFAULT_EXPIRE: Default cache entry TTL in seconds. Default 60.
• PUMPWOOD_COMMUNICATION__CACHE_TRANSACTION_TIMEOUT: SQLite transaction timeout in seconds. Default 0.1. Use 5 or higher under heavy parallel load.
• PUMPWOOD_COMMUNICATION__CACHE_N_SHARDS: Number of FanoutCache shards. Default 8.
• PUMPWOOD_COMMUNICATION__CACHE_RETRY_ATTEMPTS: Retries on SQLite lock contention. Default 5.
• PUMPWOOD_COMMUNICATION__CACHE_RETRY_DELAY: Base delay in seconds between cache retries. Default 0.05.
• PUMPWOOD_COMMUNICATION__AUTHORIZATION_CACHE_TIMEOUT: TTL for authorization and row-permission cache. Default 60.

Encryption

• PUMPWOOD_COMMUNICATION__CRYPTO_FERNET_KEY: Fernet key for PumpwoodCryptography. No default; encrypt/decrypt raise when unset.

Basic usage

The sections below cover common operations. For the full API, see the generated documentation.

List and list without pagination

Both methods list objects using dictionaries passed as payload on a POST request.

from pumpwood_communication.microservices import PumpWoodMicroService

microservice = PumpWoodMicroService(
    server_url="http://0.0.0.0:8080/",
    username="pumpwood", password="pumpwood")
microservice.login()

list_results = microservice.list(
    model_class="Company",
    filter_dict={
      "name__icontains": "Acme",
    }, exclude_dict={
      "status__in": ["deprected", "inactive"],
    },
    order_by=["holding_name", "-name"]
)

Use filter_dict and exclude_dict to adjust the query. Order results with a list of fields; names starting with - sort in descending order.

list paginates results according to the backend page size. list_without_pag does not paginate and must be used with caution for large result sets. Manual pagination using received primary keys is also possible:

microservice = PumpWoodMicroService(
    server_url="http://0.0.0.0:8080/",
    username="pumpwood", password="pumpwood")
microservice.login()

# Get the first page results using the filters and the order
pag_1 = microservice.list(
    model_class="Company",
    filter_dict={
      "name__icontains": "Acme",
    }, exclude_dict={
      "status__in": ["deprected", "inactive"],
    },
    order_by=["holding_name", "-name"]
)

# Get the list of the pks received
pag_1_pks = [obj["pk"] for obj in pag_1]

# Use in the next page query
pag_2 = microservice.list(
    model_class="Company",
    filter_dict={
      "name__icontains": "Acme",
    }, exclude_dict={
      "status__in": ["deprected", "inactive"],
      "pk__in": pag_1_pks
    },
    order_by=["holding_name", "-name"]
)

Restrict fields returned by the endpoint with the fields parameter. When fields is None, default columns are returned.

Use __ to access related fields and apply operators (similar to the Django ORM). Some examples:

Time, date, and numeric

• gt: Greater than.
• lt: Less than.
• gte: Greater than or equal.
• lte: Less than or equal.

List of values

• in: Check if a value is present in a list.

Text field

• contains: Check if a value contains another.
• icontains: Case-insensitive contains.
• unaccent_icontains: Contains, case and accent insensitive.
• startswith: Starts with the given text.
• istartswith: Starts with, case insensitive.
• unaccent_istartswith: Starts with, case and accent insensitive.
• endswith: Ends with the given text.
• iendswith: Ends with, case insensitive.
• unaccent_iendswith: Ends with, case and accent insensitive.

Date and time fields

• year: Date is in the specified year.
• month: Date is in the specified month.
• day: Date is on the specified day.

JSON fields

Access JSON key/value pairs with the -> operator.

list_results = microservice.list(
    model_class="Company",
    filter_dict={
      "json_dimensions->dim1__icontains": "test_dimention",
    }, exclude_dict={
      "json_extra_info->parameter__in": [
        1, "1", None],
    },
    order_by=[
      "json_extra_info->company-cat", "-name"]
)

Saving and updating objects

Use the save method with a dictionary that includes model_class to select the endpoint.

If pk is present, the object is updated. pk=None creates a new row.

# Creating a new object
microservice.save(obj_dict={
  "model_class": "Company",
  "name": "New Company",
  "json_extra_info": {
      "cat": "joe"
  },
  "json_dimensions": {
      "dim1": "test_save"
  }
})

# Updating an object in the database
microservice.save(obj_dict={
  "pk": 5,
  "model_class": "Company",
  "name": "New Company",
  "json_extra_info": {
      "cat": "joe"
  },
  "json_dimensions": {
      "dim1": "test_save"
  }
})

Deleting objects

Use delete to remove a single object by primary key. Some model classes soft-delete (deleted=True) instead of removing the row.

Pass force_delete=True to request a hard delete when the backend supports it (default False).

microservice.delete(model_class="Company", pk=5)

microservice.delete(
    model_class="Company", pk=5, force_delete=True)

Use delete_many with filter_dict and exclude_dict to remove multiple rows. force_delete is accepted on the simple endpoint but raises NotImplementedError when set to True until backend support is complete.

Actions: listing and executing

Each model_class can expose actions, regular or static (not tied to an object). List available actions with list_actions:

resp_list_actions = microservice.list_actions(
    model_class="Company")
# [
#   {
#     "action_name": "duplicate",
#     "doc_string": "Doc string of the function",
#     "info": "Duplicate the company at the database.",
#     "is_static_function": false,
#     "parameters": {
#       "suffix": {
#         "default_value": "new ",
#         "required": false,
#         "type": "bool"
#       },
#       "clone_id": {
#         "default_value": None,
#         "required": true,
#         "type": "bool"
#       }
#     }
#   },
#   {
#     "action_name": "create_company_from_holding",
#     "doc_string": "Doc string of the function",
#     "info": "Create a company associated to a holding.",
#     "is_static_function": true,
#     "parameters": {
#       "holding_name": {
#         "default_value": None,
#         "required": true,
#         "type": "str"
#       },
#       "parameters": {
#         "default_value": {},
#         "required": false,
#         "type": "dict"
#       }
#     }
#   }
# ]

Execute an action with execute_action:

microservice.execute_action(
    model_class="Company", pk=1, action="duplicate", parameters={
        "clone_id": True})

microservice.execute_action(
    model_class="Company", action="create_company_from_holding", parameters={
        "holding_name": "Holding one",
        "parameters": {"parm1": 1, "param2": 2}})

Other functions

Other methods are documented in their docstrings. Some of the helpers on PumpWoodMicroService:

• error_handler
• request_post
• request_get
• request_delete
• list_registered_routes
• list_registered_endpoints
• list
• list_without_pag
• list_dimentions
• list_dimention_values
• list_one
• retrieve
• retrieve_file
• retrieve_streaming_file
• save
• save_streaming_file
• delete
• remove_file_field
• delete_many
• list_actions
• execute_action
• search_options
• fill_options
• pivot
• bulk_save
• parallel_request_get
• parallel_request_post
• parallel_request_delete
• parallel_retrieve
• parallel_list
• parallel_list_without_pag
• parallel_list_one
• parallel_save
• parallel_delete
• parallel_delete_many
• parallel_execute_action
• parallel_bulk_save
• parallel_pivot