Issue/6025 implement discovery handler

changelogs/unreleased/6025-implement-discovery-handler.yml

@@ -0,0 +1,6 @@
+description: Add DiscoveryHandler interface to discover unmanaged resources.
+issue-nr: 6025
+change-type: minor
+destination-branches: [master, iso6]
+sections:
+  feature: "{{description}}"

docs/glossary.rst

@@ -124,7 +124,7 @@ Glossary
         server.
 
     infrastructure
-        That what Inmanta manages. This could be virtual machines with resources in these virtual
+        This is what Inmanta manages. This could be virtual machines with resources in these virtual
         machines. Physical servers and their os. Containers or resources at a cloud provider without
         any servers (e.g. "serverless")
 

src/inmanta/agent/agent.py

@@ -35,7 +35,7 @@
 from inmanta.agent import config as cfg
 from inmanta.agent import handler
 from inmanta.agent.cache import AgentCache
-from inmanta.agent.handler import ResourceHandler, SkipResource
+from inmanta.agent.handler import HandlerAPI, SkipResource
 from inmanta.agent.io.remote import ChannelClosedException
 from inmanta.agent.reporting import collect_report
 from inmanta.const import ParameterSource, ResourceState
@@ -151,7 +151,7 @@ async def _execute(self, ctx: handler.HandlerContext, requires: Dict[ResourceIdS
         ctx.debug("Start deploy %(deploy_id)s of resource %(resource_id)s", deploy_id=self.gid, resource_id=self.resource_id)
 
         # setup provider
-        provider: Optional[ResourceHandler] = None
+        provider: Optional[HandlerAPI] = None
         try:
             provider = await self.scheduler.agent.get_provider(self.resource)
         except ChannelClosedException as e:
@@ -766,7 +766,7 @@ def _can_get_resources(self) -> bool:
             return False
         return True
 
-    async def get_provider(self, resource: Resource) -> ResourceHandler:
+    async def get_provider(self, resource: Resource) -> HandlerAPI:
         provider = await asyncio.get_running_loop().run_in_executor(
             self.provider_thread_pool, handler.Commander.get_provider, self._cache, self, resource
         )