Added /-/metadata /-/plugins /-/inspect, closes #225

datasette/app.py

@@ -17,7 +17,6 @@ import json
 import jinja2
 import hashlib
 import time
-import pkg_resources
 import pint
 import pluggy
 import traceback
@@ -31,6 +30,7 @@ from .utils import (
     escape_sqlite,
     filters_should_redirect,
     get_all_foreign_keys,
+    get_plugins,
     is_url,
     InvalidSql,
     module_from_path,
@@ -402,15 +402,16 @@ class IndexView(RenderMixin):
             }
             databases.append(database)
         if as_json:
+            headers = {}
+            if self.ds.cors:
+                headers['Access-Control-Allow-Origin'] = '*'
             return response.HTTPResponse(
                 json.dumps(
                     {db['name']: db for db in databases},
                     cls=CustomJSONEncoder
                 ),
                 content_type='application/json',
-                headers={
-                    'Access-Control-Allow-Origin': '*'
-                }
+                headers=headers,
             )
         else:
             return self.render(
@@ -423,6 +424,32 @@ class IndexView(RenderMixin):
             )
 
 
+class JsonDataView(RenderMixin):
+    def __init__(self, datasette, filename, data_callback):
+        self.ds = datasette
+        self.jinja_env = datasette.jinja_env
+        self.filename = filename
+        self.data_callback = data_callback
+
+    async def get(self, request, as_json):
+        data = self.data_callback()
+        if as_json:
+            headers = {}
+            if self.ds.cors:
+                headers['Access-Control-Allow-Origin'] = '*'
+            return response.HTTPResponse(
+                json.dumps(data),
+                content_type='application/json',
+                headers=headers,
+            )
+        else:
+            return self.render(
+                ['show_json.html'],
+                filename=self.filename,
+                data=data,
+            )
+
+
 async def favicon(request):
     return response.text('')
 
@@ -1302,15 +1329,25 @@ class Datasette:
         for path, dirname in self.static_mounts:
             app.static(path, dirname)
         # Mount any plugin static/ directories
-        for plugin_module in pm.get_plugins():
-            try:
-                if pkg_resources.resource_isdir(plugin_module.__name__, 'static'):
-                    modpath = '/-/static-plugins/{}/'.format(plugin_module.__name__)
-                    dirpath = pkg_resources.resource_filename(plugin_module.__name__, 'static')
-                    app.static(modpath, dirpath)
-            except (KeyError, ImportError):
-                # Caused by --plugins_dir= plugins - KeyError/ImportError thrown in Py3.5
-                pass
+        for plugin in get_plugins(pm):
+            if plugin['static_path']:
+                modpath = '/-/static-plugins/{}/'.format(plugin['name'])
+                app.static(modpath, plugin['static_path'])
+        app.add_route(
+            JsonDataView.as_view(self, 'inspect.json', lambda: self.inspect()),
+            '/-/inspect<as_json:(\.json)?$>'
+        )
+        app.add_route(
+            JsonDataView.as_view(self, 'metadata.json', lambda: self.metadata),
+            '/-/metadata<as_json:(\.json)?$>'
+        )
+        app.add_route(
+            JsonDataView.as_view(self, 'plugins.json', lambda: [{
+                'name': p['name'],
+                'static': p['static_path'] is not None
+            } for p in get_plugins(pm)]),
+            '/-/plugins<as_json:(\.json)?$>'
+        )
         app.add_route(
             DatabaseView.as_view(self),
             '/<db_name:[^/\.]+?><as_json:(\.jsono?)?$>'

datasette/templates/show_json.html

@@ -0,0 +1,12 @@
+{% extends "base.html" %}
+
+{% block title %}{{ filename }}{% endblock %}
+
+{% block body_class %}show-json{% endblock %}
+
+{% block content %}
+<h1>{{ filename }}</h1>
+
+<pre>{{ data|tojson(indent=4) }}</pre>
+
+{% endblock %}

datasette/utils.py

@@ -4,6 +4,7 @@ import hashlib
 import imp
 import json
 import os
+import pkg_resources
 import re
 import shlex
 import sqlite3
@@ -683,3 +684,20 @@ def module_from_path(path, name):
         code = compile(file.read(), path, 'exec', dont_inherit=True)
     exec(code, mod.__dict__)
     return mod
+
+
+def get_plugins(pm):
+    plugins = []
+    for plugin in pm.get_plugins():
+        static_path = None
+        try:
+            if pkg_resources.resource_isdir(plugin.__name__, 'static'):
+                static_path = pkg_resources.resource_filename(plugin.__name__, 'static')
+        except (KeyError, ImportError):
+            # Caused by --plugins_dir= plugins - KeyError/ImportError thrown in Py3.5
+            pass
+        plugins.append({
+            'name': plugin.__name__,
+            'static_path': static_path,
+        })
+    return plugins

tests/fixtures.py

@@ -29,7 +29,9 @@ def app_client(sql_time_limit_ms=None):
         ds.sqlite_functions.append(
             ('sleep', 1, lambda n: time.sleep(float(n))),
         )
-        yield ds.app().test_client
+        client = ds.app().test_client
+        client.ds = ds
+        yield client
 
 
 def app_client_longer_time_limit():

tests/test_api.py

@@ -3,6 +3,7 @@ from .fixtures import (
     app_client_longer_time_limit,
     generate_compound_rows,
     generate_sortable_rows,
+    METADATA,
 )
 import pytest
 
@@ -629,3 +630,30 @@ def test_plugins_dir_plugin(app_client):
         gather_request=False
     )
     assert pytest.approx(328.0839) == response.json['rows'][0][0]
+
+
+def test_metadata_json(app_client):
+    response = app_client.get(
+        "/-/metadata.json",
+        gather_request=False
+    )
+    assert METADATA == response.json
+
+
+def test_inspect_json(app_client):
+    response = app_client.get(
+        "/-/inspect.json",
+        gather_request=False
+    )
+    assert app_client.ds.inspect() == response.json
+
+
+def test_plugins_json(app_client):
+    response = app_client.get(
+        "/-/plugins.json",
+        gather_request=False
+    )
+    # This will include any plugins that have been installed into the
+    # current virtual environment, so we only check for the presence of
+    # the one we know will definitely be There
+    assert {'name': 'my_plugin.py', 'static': False} in response.json