Add /server/* endpoint group to REST API

This includes the implementation of the endpoints `/server/info` and
`/server/endpoints`. There are some slight changes over the old REST
API:

* The endpoint `/server/` has been moved to `/server/info`
* The key name in the response of endpoint `/server/endpoints` has been changed
  from `available_endpoints` to `endpoints`
* The strings in the response of endpoint `/server/endpoints` has been
  splitted up into a dictionary with keys "methods", "group", "path" that
  contain the same information as the strings but structured
* Updated API version to the version of the repo. This required a new
  file to prevent circular imports

aiida_restapi/__init__.py

@@ -1,5 +1,5 @@
 """AiiDA REST API for data queries and workflow managment."""
 
-__version__ = '0.1.0a1'
+__version__ = '0.1.0a'
 
 from .main import app  # noqa: F401

aiida_restapi/config.py

@@ -1,5 +1,7 @@
 """Configuration of API"""
 
+from importlib.metadata import version
+
 # to get a string like this run:
 # openssl rand -hex 32
 SECRET_KEY = '09d25e094faa6ca2556c818166b7a9563b93f7099f6f0f4caa6cf63b88e8d3e7'
@@ -20,3 +22,8 @@
 
 # The chunks size for streaming data for download
 DOWNLOAD_CHUNK_SIZE = 1024
+
+API_CONFIG = {
+    'PREFIX': version('aiida_restapi'),  # prefix for all URLs
+    'VERSION': '0.1.0a',
+}

aiida_restapi/main.py

@@ -1,9 +1,12 @@
 """Declaration of FastAPI application."""
 
+from typing import Any
+
 from fastapi import FastAPI
 
+from aiida_restapi.config import API_CONFIG
 from aiida_restapi.graphql import main
-from aiida_restapi.routers import auth, computers, daemon, groups, nodes, process, users
+from aiida_restapi.routers import auth, computers, daemon, groups, nodes, process, server, users
 
 app = FastAPI()
 app.include_router(auth.router)
@@ -14,3 +17,31 @@
 app.include_router(users.router)
 app.include_router(process.router)
 app.add_route('/graphql', main.app, name='graphql')
+
+
+# We need to create this endpoint here instead of in the server to avoid circular imports, since it is dependent on the
+# app
+@server.router.get('/server/endpoints', response_model=dict[str, Any])
+async def get_server_endpoints() -> dict[str, Any]:
+    """List available routes"""
+    import re
+
+    from fastapi.routing import APIRoute
+
+    routes = []
+    for route in app.routes:
+        if isinstance(route, APIRoute):
+            full_path = API_CONFIG['PREFIX'] + route.path
+            match = re.search(r'^\/([^\/]+)', route.path)
+            endpoint_group = None if match is None else match.group(1)
+            routes.append(
+                {
+                    'path': full_path,
+                    'group': endpoint_group,
+                    'methods': route.methods,
+                }
+            )
+    return {'endpoints': routes}
+
+
+app.include_router(server.router)

aiida_restapi/routers/server.py

@@ -0,0 +1,26 @@
+"""Declaration of FastAPI application."""
+
+from typing import Any
+
+from aiida import __version__ as aiida_version
+from fastapi import APIRouter
+
+from aiida_restapi.config import API_CONFIG
+
+router = APIRouter()
+
+
+@router.get('/server/info', response_model=dict[str, Any])
+async def get_server_info() -> dict[str, Any]:
+    """Get the API version information"""
+    response = {}
+    api_version = API_CONFIG['VERSION'].split('.')
+    response['API_major_version'] = api_version[0]
+    response['API_minor_version'] = api_version[1]
+    response['API_revision_version'] = api_version[2]
+    # Add Rest API prefix
+    response['API_prefix'] = API_CONFIG['PREFIX']
+
+    # Add AiiDA version
+    response['AiiDA_version'] = aiida_version
+    return response

tests/conftest.py

@@ -317,32 +317,39 @@ def _func(
     return _func
 
 
+def _create_node(
+    *,
+    label: str = '',
+    description: str = '',
+    attributes: Optional[dict] = None,
+    extras: Optional[dict] = None,
+    process_type: Optional[str] = None,
+    computer: Optional[orm.Computer] = None,
+    store: bool = True,
+) -> orm.nodes.Node:
+    node = orm.CalcJobNode(computer=computer) if process_type else orm.Data(computer=computer)
+    node.label = label
+    node.description = description
+    node.base.attributes.reset(attributes or {})
+    node.base.extras.reset(extras or {})
+    if process_type is not None:
+        node.process_type = process_type
+    if store:
+        node.store()
+    return node
+
+
 @pytest.fixture
 def create_node():
     """Create and store an AiiDA Node."""
+    return _create_node
 
-    def _func(
-        *,
-        label: str = '',
-        description: str = '',
-        attributes: Optional[dict] = None,
-        extras: Optional[dict] = None,
-        process_type: Optional[str] = None,
-        computer: Optional[orm.Computer] = None,
-        store: bool = True,
-    ) -> orm.nodes.Node:
-        node = orm.CalcJobNode(computer=computer) if process_type else orm.Data(computer=computer)
-        node.label = label
-        node.description = description
-        node.base.attributes.reset(attributes or {})
-        node.base.extras.reset(extras or {})
-        if process_type is not None:
-            node.process_type = process_type
-        if store:
-            node.store()
-        return node
 
-    return _func
+@pytest.fixture
+def calcjob_nodes():
+    """Populate database with calcjob nodes."""
+    nodes = [_create_node(label=f'node {i}', process_type='', store=False) for i in range(4)]
+    return nodes
 
 
 @pytest.fixture