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Django app for accessing the EVE Swagger Interface (ESI).

Project description

django-esi

Django app for easy access to the EVE Swagger Interface (ESI)

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Contents

Overview

Django-esi is a Django app that provides an interface for easy access to the EVE Swagger Interface (ESI), the official API for the game EVE Online.

It is build upon Bravado - a python client library for Swagger 2.0 services.

Django-esi adds the following main functionalities to a Django site:

  • Dynamically generated client for interacting with public and private ESI endpoints
  • Support for adding EVE SSO to authenticate characters and retrieve tokens
  • Control over which ESI endpoint versions are used

Installation

Step 1: Install the latest version directly from PyPI

pip install django-esi

Step 2: Add esi to your INSTALLED_APPS setting

INSTALLED_APPS += [
    # other apps
    'esi',
    # other apps
]

Step 3: Include the esi urlconf in your project's urls

url(r'^sso/', include('esi.urls', namespace='esi')),

Step 4: Register an application with the EVE Developers site

If your application requires scopes, select Authenticated API Access and register all possible scopes your app can request. Otherwise Authentication Only will suffice.

Set the Callback URL to https://example.com/sso/callback

Step 4: Add SSO client settings to your project settings

ESI_SSO_CLIENT_ID = "my client id"
ESI_SSO_CLIENT_SECRET = "my client secret"
ESI_SSO_CALLBACK_URL = "https://example.com/sso/callback"

Step 5: Run migrations to create models

python manage.py migrate

Upgrade

To update an existing installation please first make sure that you are in your virtual environment and in the main project folder (the one that has manage.py). Then run the following commands one by one:

pip install -U django-esi
python manage.py migrate
python manage.py collectstatic

Finally restart your Django application, e.g. by restarting your supervisors.

Usage in views

Single token

When views require a token, wrap with the token_required decorator and accept a token arg:

from esi.decorators import token_required

@token_required(scopes="esi-characters.read_medals.v1")
def my_view(request, token):
    # my code

This will prompt the user to either select a token from their current ones, or if none exist create a new one via SSO.

To specify scopes, add either a list of names or a space-delimited string:

@token_required(scopes=['esi-location.read_ship_type.v1', 'esi-location.read_location.v1'])
@token_required(scopes='esi-location.read_ship_type.v1 esi-location.read_location.v1')

New token

To require a new token, such as for logging in, add the new argument:

@token_required(new=True)

Multiple tokens

To request all of a user's tokens which have the required scopes, wrap instead with the tokens_required decorator and accept a tokens arg:

@tokens_required(scopes='esi-location.read_ship_type.v1')
def my_view(request, tokens):
    # my code

This skips prompting for token selection and instead passes that responsibility to the view. Tokens are provided as a queryset.

Single use token

It is also possible to request a token for single use. Single use tokens do not require a user to be logged in and are only available to the current view.

from esi.decorators import single_use_token

@single_use_token(scopes=['publicData'])
my_view(request, token):
    # my code

Accessing ESI

django-esi provides a convenience wrapper around the bravado SwaggerClient.

New approach for getting a client object

All access to ESI happens through a client object that is automatically generated for you and contains all of ESI's routes. The new and recommended way of getting that client object is through a single provider instance from the EsiClientProvider class.

The new provider approach has two main advantages: First, creating a new client is slow (e.g. can takes up to 5 seconds). So, for maximum performance you want to avoid creating multiple clients in your app. Using the provider automatically ensures this.

Second, the previous approach of creating multiple clients can cause memory leaks. Especially when used in concurrent environment (e.g. threads or celery tasks), where each worker is creating it's own client.

Example for creating a provider

The provider needs to be instantiated at "import time", so it must be defined in the global scope of a module.

from esi.clients import EsiClientProvider

# create your own provider
esi = EsiClientProvider()

def main():
    # do stuff with your provider

If you need to use the provider in several module than a good pattern is to define it in it's own module, e.g. providers.py, and then import the provider instance into all other modules that need an ESI client.

Using public endpoints

Here is a complete example how to use a public endpoint. Public endpoints can in general be accessed without any authentication.

from esi.clients import EsiClientProvider

# create your own provider
esi = EsiClientProvider()

def main():
    # call the endpoint
    result = esi.client.Status.get_status().results()

    # ... do stuff with the data
    print(result)

Using authenticated endpoints

Non-public endpoints will require authentication. You will therefore need to provide a valid access token with your request.

The following example shows how to retrieve data from a non-public endpoint using an already existing token in your database. See also the section Usage in apps on how to create tokens in your app.

from esi.clients import EsiClientProvider
from esi.models import Token

# create your own provider
esi = EsiClientProvider()

def main():
    character_id = 1234
    required_scopes = ['esi-characters.read_notifications.v1']

    # get a token
    token = Token.get_token(character_id, required_scopes)

    # call the endpoint
    notifications = esi.client.Character.get_characters_character_id_notifications(
        # required parameter for endpoint
        character_id = character_id,
        # provide a valid access token, which wil be refresh the token if required
        token = token.valid_access_token()
    ).results()

    # ... do stuff with the data

results() vs. result()

django-esi offers two similar methods for requesting the response from an endpoint: results() and result(). Here is a quick overview how they differ:

Topic results() result()
Paging Automatically returns all pages if they are more than one Only returns the fist page or the requested page (when specified with page parameter)
Headers Returns the headers for the last retrieved page Returns the headers for the first / requested page
Backwards compatibility New feature in 2.0 Works mostly as in 1.6

In general we recommend to use results(), so you don't have to worry about paging. Nevertheless, result() gives you more direct control of your API request and has it's uses, e.g when you are only interested in the first page and do not want to wait for all pages to download from the API.

Getting localized responses from ESI

Some ESI endpoints support localization, which means they are able to return the content localized in one of the supported languages.

To retrieve localized content just provide the language code in your request. The following example will retrieve the type info for the Svipul in Korean:

result = (
    esi.client.Universe
    .get_universe_types_type_id(type_id=30004984, language='ko')
    .results()
)

A common use case it to retrieve localizations for all languages for the current request. For this django-esi provides the convenience method results_localized(). It substitutes results() and will return the response in all officially supported languages by default.

result = (
    esi.client.Universe
    .get_universe_types_type_id(type_id=30004984)
    .results_localized()
)

Alternatively you can pass the list of languages (as language code) that you are interested in:

result = (
    esi.client.Universe
    .get_universe_types_type_id(type_id=30004984)
    .results_localized(languages=['ko', 'de'])
)

Specifying resource versions

As explained on the EVE Developers Blog, it's best practice to call a specific version of the resource and allow the ESI router to map it to the correct route, being legacy, latest or dev.

Client initialization begins with a base swagger spec. By default this is the version defined in settings (ESI_API_VERSION), but can be overridden with an extra argument to the factory:

client = esi_client_factory(version='v4')

Only resources with the specified version number will be available. For instance, if you specify v4 but Universe does not have a v4 version, it will not be available to that specific client. Only legacy, latest and dev are guaranteed to have all resources available.

Individual resources are versioned and can be accessed by passing additional arguments to the factory:

client = esi_client_factory(Universe='v1', Character='v3')

A list of available resources is available on the EVE Swagger Interface browser. If the resource is not available with the specified version, an AttributeError will be raised.

This version of the resource replaces the resource originally initialized. If the requested base version does not have the specified resource, it will be added.

Note that only one old revision of each resource is kept available through the legacy route. Keep an eye on the deployment timeline for resource updates.

User Agent header

CCP asks developers to provide a "good User-Agent header" with all requests to ESI, so that CCP can identify which app the request belongs to and is able to contact the server owner running the app in case of any issues. This requirement is specified in the CCP's Developer Guidelines and detailed in the ESI guidelines.

Django-esi provides two features for setting the User-Agent header:

Application Info

You configure the User-Agent to represent your application by setting the app_info_text parameter when creating a client with EsiClientProvider() or with esi_client_factory().

There is no official format for the User-Agent, but we would suggest including the distribution name (same as e.g. in your setup.py) and current version of your application like so:

"my-app v1.0.0"

Here is a complete example for defining an application string with your app:

from esi.clients import EsiClientProvider

esi = EsiClientProvider(app_info_text="my-app v1.0.0")

Hint
Spaces are used as delimiter in the User Agent, so your application name should not include any.

Note
If you do not define an application string, the application string used will be "django-esi vX.Y.Z".

Contact email

To enable CCP to contact the maintainer of a server that is using ESI it is important to specify a contact email. This can be done through the setting ESI_USER_CONTACT_EMAIL.

Example:

ESI_USER_CONTACT_EMAIL = "admin@example.com"

In case you are not hosting the app yourself, we would recommend including this setting in the installation guide for your app.

Cleaning the database

Two tasks are available:

  • cleanup_callbackredirect removes all CallbackRedirect models older than a specified age (in seconds). Default is 300.
  • cleanup_token checks all Token models, and if expired, attempts to refresh. If expired and cannot refresh, or fails to refresh, the model is deleted.

To schedule these automatically with celerybeat, add them to your settings.py CELERYBEAT_SCHEDULE dict like so:

from celery.schedules import crontab

CELERYBEAT_SCHEDULE = {
    ...
    'esi_cleanup_callbackredirect': {
        'task': 'esi.tasks.cleanup_callbackredirect',
        'schedule': crontab(hour='*/4'),
    },
    'esi_cleanup_token': {
        'task': 'esi.tasks.cleanup_token',
        'schedule': crontab(day_of_month='*/1'),
    },
}

Recommended intervals are four hours for callback redirect cleanup and daily for token cleanup (token cleanup can get quite slow with a large database, so adjust as needed). If your app does not require background token validation, it may be advantageous to not schedule the token cleanup task, instead relying on the validation check when using @token_required decorators or adding .require_valid() to the end of a query.

Advanced Features

Using a local spec file

Specifying resource versions introduces one major problem for shared code: not all resources nor all their operations are available on any given version. This can be addressed by shipping a copy of the versioned latest spec with your app. This is the preferred method for deployment.

To build a client using this local spec, pass an additional parameter spec_file which contains the path to your local swagger.json:

from esi.clients import EsiClientProvider

esi = EsiClientProvider(spec_file='/path/to/swagger.json')

For example, a swagger.json in the current file's directory would look like:

import os
from esi.clients import EsiClientProvider

SWAGGER_SPEC = os.path.join(os.path.dirname(os.path.abspath(__file__)), 'swagger.json')
esi = EsiClientProvider(spec_file=SWAGGER_SPEC)

If a spec_file is specified all other versioning is unavailable: ensure you ship a spec with resource versions your app can handle.

Getting Response Data

Sometimes you may want to also get the internal response object from an ESI response. For example to inspect the response header. For that simply set the request_config.also_return_response to True and then call the endpoint. This works in the same way for both .result() and .results()

from esi.clients import EsiClientProvider
from esi.models import Token

# create your own provider
esi = EsiClientProvider()

def main():
    character_id = 1234
    required_scopes = ['esi-characters.read_notifications.v1']

    # get a token
    token = Token.get_token(character_id, required_scopes)

    # call the endpoint but don't request data.
    operation = esi.client.Character.get_characters_character_id_notifications(
        character_id = character_id,
        token = token.valid_access_token()
    )

    # set to get the response as well
    operation.request_config.also_return_response = True

    # get your data
    notifications, response = operation.results()

    # ... do stuff with the data
    print(response.headers['Expires'])

Accessing alternate data sources

ESI data source can also be specified during client creation:

from esi.clients import EsiClientProvider
from esi.models import Token

# create your own provider
esi = EsiClientProvider(datasource='tranquility')

Currently the only available data source is tranquility, which is also the default The previously available datasource singularity is no longer available.

Settings

Django-esi can be configured through settings by adding them to your Django settings file. Here is a list of often used settings:

Name Description Default
ESI_CONNECTION_POOL_MAXSIZE Max size of the connection pool. Increase this setting if you hav more parallel threads connected to ESI at the same time, e.g. if you are running more concurrent celery tasks that are doing ESI calls. 10
ESI_USER_CONTACT_EMAIL Contact email address of the ESI user, e.g. server admin, which will be included in the User-Agent header of every request. None
ESI_INFO_LOGGING_ENABLED Enable/disable verbose info logging False
ESI_SSO_CALLBACK_URL Required to enable SSO login / token creation N/A
ESI_SSO_CLIENT_ID Client ID of Eve SSO app. Required to enable SSO login / token creation. N/A
ESI_SSO_CLIENT_SECRET Client secret of Eve SSO app. Required to enable SSO login / token creation N/A

Please see the file app_settings.py for a list of all settings.

History of this app

This app is a fork from adarnauth-esi. Since this app is an important component of the Alliance Auth system and Adarnof - the original author - was no longer able to maintain it the AA dev team has decided in December 2019 to take over maintenance and further developing for this app within the Alliance Auth project.

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