graceful is documentation centered falcon REST toolkit. It is highly inspired
by Django REST framework - mostly by
how object serialization is done but more emphasis here is put on API to
being self-descriptive.
Features:
- generic classes for list 8000 and single object resources
- simple but extendable pagination
- structured responses with content/meta separation
- declarative fields and parameters
- self-descriptive-everything: API description accessible both in python and
through
OPTIONSrequests - painless validation
- 100% tests coverage
- falcon>=0.3.0
- python3 exclusive (tested from 3.3 to 3.4)
There is no community behind graceful yet but I hope we will build one someday with your help. Anyway there is a mailing list on Librelist. Just send an email to graceful@librelist.com and you're subscribed.
Important: graceful is python3 exclusive because right now should be
a good time to forget about python2. There are no plans for making graceful
python2 compatibile although it would be pretty straightforward do do so with
existing tools (like six).
For extended tutorial and more information please refer to guide included in documentation.
Anyway here is simple example of working API made made with graceful:
import falcon
from graceful.serializers import BaseSerializer
from graceful.fields import IntField, RawField
from graceful.parameters import StringParam
from graceful.resources.generic import (
RetrieveAPI,
PaginatedListAPI,
)
api = application = falcon.API()
# lets pretend that this is our backend storage
CATS_STORAGE = [
{"id": 0, "name": "kitty", "breed": "saimese"},
{"id": 1, "name": "lucie", "breed": "maine coon"},
{"id": 2, "name": "molly", "breed": "sphynx"},
]
# this is how we represent cats in our API
class CatSerializer(BaseSerializer):
id = IntField("cat identification number", read_only=True)
name = RawField("cat name")
breed = RawField("official breed name")
class Cat(RetrieveAPI):
"""
Single cat identified by its id
"""
serializer = CatSerializer()
def get_cat(self, cat_id):
try:
return [
cat for cat in CATS_STORAGE if cat['id'] == int(cat_id)
][0]
except IndexError:
raise falcon.HTTPNotFound
def retrieve(self, params, meta, **kwargs):
cat_id = kwargs['cat_id']
return self.get_cat(cat_id)
class CatList(PaginatedListAPI):
"""
List of all cats in our API
"""
serializer = CatSerializer()
breed = StringParam("set this param to filter cats by breed")
def list(self, params, meta, **kwargs):
if 'breed' in params:
filtered = [
cat for cat in CATS_STORAGE
if cat['breed'] == params['breed']
]
return filtered
else:
return CATS_STORAGE
api.add_route("/v1/cats/{cat_id}", Cat())
api.add_route("/v1/cats/", CatList())Assume this code is in python module named example.py.
Now run it with gunicorn:
gunicorn -b localhost:8888 example
And you're ready to query it (here with awesome hhtpie tool):
$ http localhost:8888/v0/cats/?breed=saimese
HTTP/1.1 200 OK
Connection: close
Date: Tue, 16 Jun 2015 08:43:05 GMT
Server: gunicorn/19.3.0
content-length: 116
content-type: application/json
{
"content": [
{
"breed": "saimese",
"id": 0,
"name": "kitty"
}
],
"meta": {
"params": {
"breed": "saimese",
"indent": 0
}
}
}
Or access API description issuing OPTIONS request:
$ http OPTIONS localhost:8888/v0/cats
HTTP/1.1 200 OK
Connection: close
Date: Tue, 16 Jun 2015 08:40:00 GMT
Server: gunicorn/19.3.0
content-length: 740
content-type: application/json
{
"details": "List of all cats in our API",
"fields": {
"breed": {
"details": "official breed name",
"label": null,
"spec": null,
"type": "string"
},
"id": {
"details": "cat identification number",
"label": null,
"spec": null,
"type": "int"
},
"name": {
"details": "cat name",
"label": null,
"spec": null,
"type": "string"
}
},
"methods": [
"GET",
"OPTIONS"
],
"name": "CatList",
"params": {
"breed": {
"default": null,
"details": "set this param to filter cats by breed",
"label": null,
"required": false,
"spec": null,
"type": "string"
},
"indent": {
"default": "0",
"details": "JSON output indentation. Set to 0 if output should not be formated.",
"label": null,
"required": false,
"spec": null,
"type": "integer"
}
},
"path": "/v0/cats",
"type": "list"
}
Any contribution is welcome. Issues, suggestions, pull requests - whatever. There is only short set of rules that guide this project development you should be aware of before submitting a pull request:
- only requests that have passing CI builds (Travis) will be merged
- code is checked with flakes8 during build so this implicitely means that PEP-8 is a must
- no changes that decrease coverage will be merged
One thing: if you submit a PR please do not rebase it later unless you are asked for that explicitely. Reviewing pull requests that suddenly had their history rewritten just drives me crazy.
See LICENSE file