gqlclient 2.0.0

Client library for making graphql calls.

A pythonic interface for making requests to a GraphQL server using pydantic V2 BaseModels to spare you from string manipulation.

Features

• Use pydantic v2 BaseModels to specify graphql parameters and responses

• As of gqlclient v2, standard library dataclasses are no longer supported

• As of gqlclient v2, pydantic dataclasses are no longer supported

• Create and execute GraphQL Queries based upon typed models

• Create and execute GraphQL Mutations based upon typed models

• Async support

Installation

pip install gqlclient

with asyncio support

pip install gqlclient[async]

for developers

pip install gqlclient[test]
pip install pre-commit
pre-commit install

Examples

Query

# limited to pydantic V2
from pydantic import BaseModel

from gqlclient import GraphQLClient
from gqlclient.request_wrap import wrap_request
from gqlclient.response_encoders import json_encoder

class GetRequest(BaseModel):
    attr_one: str
    attr_two: int

class Response(BaseModel):
    attr_three: int
    attr_four: str

# url for a running GQL server
client = GraphQLClient(gql_uri="http://localhost:8080/graphql")
query_params = GetRequest(attr_one="foo", attr_two=3)
query = client.get_query(query_base="baseType", query_response_cls=Response, query_parameters=wrap_request(query_params))
print(query)
# {'query': '{baseType(filterParams: {attr_one: "foo", attr_two: 3}){attr_three, attr_four} }'}
pseudo_response = client.execute_gql_query(query_base="baseType", query_response_cls=Response, query_parameters=wrap_request(query_params))
print(pseudo_response)
# [Response(attr_three=5, attr_four="bar")]

Mutation

# limited to pydantic V2
from pydantic import BaseModel

from gqlclient import GraphQLClient


class MutationRequest(BaseModel):
    attr_one: str
    attr_two: int


class Response(BaseModel):
    attr_three: int
    attr_four: str

# url for a running GQL server
client = GraphQLClient(gql_uri="http://localhost:8080/graphql")
mutation_params = MutationRequest(attr_one="foo", attr_two=3)
mutation = client.get_mutation(mutation_base="baseMutation", mutation_response_cls=Response, mutation_parameters=wrap_request(mutation_params))
print(mutation)
# {'query': 'mutation baseMutation {baseMutation(baseMuParams: {attr_one: "foo", attr_two: 3}){attr_three, attr_four} }', 'operationName': 'baseMutation'}

pseudo_response = client.execute_gql_mutation(mutation_base="baseMutation", mutation_response_cls=Response, mutation_parameters=wrap_request(mutation_params))
print(pseudo_response)
# [Response(attr_three=5, attr_four="bar")]

Encoders

# limited to pydantic V2
from pydantic import BaseModel

from gqlclient import GraphQLClient
from gqlclient import json_encoder

# url for a running GQL server
# set the default encoder to the json_encoder
client = GraphQLClient(gql_uri="http://localhost:8080/graphql", default_response_encoder=json_encoder)

class QueryResponse(BaseModel):
    workflowId: int
    workflowName: str
    workflowDescription: str | None = None

response = client.execute_gql_query("workflows",QueryResponse)
print(response)
# Response is a json formatted string
# {"workflows": [{"workflowId": 1, "workflowName": "gql3_full - workflow_name", "workflowDescription": "gql3_full - workflow_description"}, {"workflowId": 2, "workflowName": "VBI base calibration", "workflowDescription": "The base set of calibration tasks for VBI."}]}

from gqlclient import basemodel_encoder
# for this call override the default encoder
response = client.execute_gql_query("workflows", QueryResponse, response_encoder=basemodel_encoder)
print(response)
# Response type is a list of BaseModels
# [QueryResponse(workflowId=1, workflowName='gql3_full - workflow_name', workflowDescription='gql3_full - workflow_description'), QueryResponse(workflowId=2, workflowName='VBI base calibration', workflowDescription='The base set of calibration tasks for VBI.')]

Best Practices

Simple Conversions between Camel Case and Snake Case

If your target GQL endpoint uses camelCase, follow these steps.

First, create a CamelHelper class:

# limited to pydantic V2
from pydantic import BaseModel
from pydantic import ConfigDict
from pydantic.alias_generators import to_camel


class CamelHelper(BaseModel):
    """
    Helper Class.
    Extend this class as if it were BaseModel.
    Within the subclass, define the fields using snake_case.
    Upon BaseModel instantiation, either snake_case or camelCase is valid input.
    Normal model_dump will create a dict with snake_case keys.
    Alias model_dump, with `by_alias=True`, will create a dict with camelCase keys.
    """
    model_config = ConfigDict(
        alias_generator=to_camel,
        populate_by_name=True,
    )

When defining your models, extend CamelHelper, instead of BaseModel. Define the attributes using snake_case.

class AliasSample(CamelHelper):
    required_str: str
    optional_float: float | None = None

# camelCase accepted upon creation
alias_sample = AliasSample(requiredStr="hello")

The internal key names will be snake_case. You can dump to a dict with snake_case keys:

alias_data_snake: dict = alias_sample.model_dump()

Or you can dump to a dict with camelCase keys:

alias_data_camel: dict = alias_sample.model_dump(by_alias=True)

Passing a dict as a dict

To pass a dict as a dict, the GQL Server must define the data type of the corresponding field as JSON. Note that JSON and JSONString are not the same thing. JSONString expects a json encoded string (frequently via json.dumps) which is transformed via json.loads. JSON expects an object and no transformation occurs.

Define the field as a dict within the model:

# limited to pydantic V2
from pydantic import BaseModel

class SampleCreateRequest(CamelHelper):
    required_str:  str | None = "Awesome"
    payload: dict | None = None

dummy_payload = {
    "key_str": "Party On, Wayne",
    "key_int": 42,
    "key_float": 3.141592,
    "key_none": None,
    "key_true": True,
    "key_false": False,
}
create_request = SampleCreateRequest(
    payload = dummy_payload
    )

Execute the request:

# sample response
class SampleResponse(CamelHelper):
    payload: dict | None = None

# url for a running GQL server
client = GraphQLClient(gql_uri="http://localhost:8080/graphql")

# assuming GQL server defines `payload` as `JSON`
pseudo_response = client.execute_gql_mutation(
   mutation_base="sampleMutation",
   mutation_response_cls=SampleResponse,
   mutation_parameters=wrap_request(create_request)
)

assert isinstance(create_request.payload, dict)
assert isinstance(pseudo_response.payload, dict)
assert create_request.payload == pseudo_response.payload