Merge pull request #2203 from minrk/entrypoints

allow spawners and authenticators to register via entry points

docs/source/reference/authenticators.md

@@ -75,7 +75,6 @@ Writing an Authenticator that looks up passwords in a dictionary
 requires only overriding this one method:
 
 ```python
-from tornado import gen
 from IPython.utils.traitlets import Dict
 from jupyterhub.auth import Authenticator
 
@@ -85,8 +84,7 @@ class DictionaryAuthenticator(Authenticator):
         help="""dict of username:password for authentication"""
     )
 
-    @gen.coroutine
-    def authenticate(self, handler, data):
+    async def authenticate(self, handler, data):
         if self.passwords.get(data['username']) == data['password']:
             return data['username']
 ```
@@ -143,6 +141,41 @@ See a list of custom Authenticators [on the wiki](https://github.com/jupyterhub/
 If you are interested in writing a custom authenticator, you can read
 [this tutorial](http://jupyterhub-tutorial.readthedocs.io/en/latest/authenticators.html).
 
+### Registering custom Authenticators via entry points
+
+As of JupyterHub 1.0, custom authenticators can register themselves via
+the `jupyterhub.authenticators` entry point metadata.
+To do this, in your `setup.py` add:
+
+```python
+setup(
+  ...
+  entry_points={
+    'jupyterhub.authenticators': [
+        'myservice = mypackage:MyAuthenticator',
+    ],
+  },
+)
+```
+
+If you have added this metadata to your package,
+users can select your authenticator with the configuration:
+
+```python
+c.JupyterHub.authenticator_class = 'myservice'
+```
+
+instead of the full
+
+```python
+c.JupyterHub.authenticator_class = 'mypackage:MyAuthenticator'
+```
+
+previously required.
+Additionally, configurable attributes for your spawner will
+appear in jupyterhub help output and auto-generated configuration files
+via `jupyterhub --generate-config`.
+
 
 ### Authentication state
 

docs/source/reference/spawners.md

@@ -10,6 +10,7 @@ and a custom Spawner needs to be able to take three actions:
 
 
 ## Examples
+
 Custom Spawners for JupyterHub can be found on the [JupyterHub wiki](https://github.com/jupyterhub/jupyterhub/wiki/Spawners).
 Some examples include:
 
@@ -174,6 +175,42 @@ When `Spawner.start` is called, this dictionary is accessible as `self.user_opti
 
 If you are interested in building a custom spawner, you can read [this tutorial](http://jupyterhub-tutorial.readthedocs.io/en/latest/spawners.html).
 
+### Registering custom Spawners via entry points
+
+As of JupyterHub 1.0, custom Spawners can register themselves via
+the `jupyterhub.spawners` entry point metadata.
+To do this, in your `setup.py` add:
+
+```python
+setup(
+  ...
+  entry_points={
+    'jupyterhub.spawners': [
+        'myservice = mypackage:MySpawner',
+    ],
+  },
+)
+```
+
+If you have added this metadata to your package,
+users can select your authenticator with the configuration:
+
+```python
+c.JupyterHub.spawner_class = 'myservice'
+```
+
+instead of the full
+
+```python
+c.JupyterHub.spawner_class = 'mypackage:MySpawner'
+```
+
+previously required.
+Additionally, configurable attributes for your spawner will
+appear in jupyterhub help output and auto-generated configuration files
+via `jupyterhub --generate-config`.
+
+
 ## Spawners, resource limits, and guarantees (Optional)
 
 Some spawners of the single-user notebook servers allow setting limits or