add workers autodicsovery feature

src/ahriman/application/ahriman.py

@@ -135,6 +135,8 @@ def _parser() -> argparse.ArgumentParser:
     _set_service_setup_parser(subparsers)
     _set_service_shell_parser(subparsers)
     _set_service_tree_migrate_parser(subparsers)
+    _set_service_worker_register_parser(subparsers)
+    _set_service_worker_unregister_parser(subparsers)
     _set_user_add_parser(subparsers)
     _set_user_list_parser(subparsers)
     _set_user_remove_parser(subparsers)
@@ -1052,6 +1054,40 @@ def _set_service_tree_migrate_parser(root: SubParserAction) -> argparse.Argument
     return parser
 
 
+def _set_service_worker_register_parser(root: SubParserAction) -> argparse.ArgumentParser:
+    """
+    add parser for remote worker registration subcommand
+
+    Args:
+        root(SubParserAction): subparsers for the commands
+
+    Returns:
+        argparse.ArgumentParser: created argument parser
+    """
+    parser = root.add_parser("service-worker-register", help="register itself as worker",
+                             description="call remote service registering itself as available worker",
+                             formatter_class=_formatter)
+    parser.set_defaults(handler=handlers.Triggers, trigger=["ahriman.core.distributed.WorkerRegisterTrigger"])
+    return parser
+
+
+def _set_service_worker_unregister_parser(root: SubParserAction) -> argparse.ArgumentParser:
+    """
+    add parser for remote worker removal subcommand
+
+    Args:
+        root(SubParserAction): subparsers for the commands
+
+    Returns:
+        argparse.ArgumentParser: created argument parser
+    """
+    parser = root.add_parser("service-worker-unregister", help="unregister itself as worker",
+                             description="call remote service removing itself from list of available workers",
+                             formatter_class=_formatter)
+    parser.set_defaults(handler=handlers.Triggers, trigger=["ahriman.core.distributed.WorkerUnregisterTrigger"])
+    return parser
+
+
 def _set_user_add_parser(root: SubParserAction) -> argparse.ArgumentParser:
     """
     add parser for create user subcommand

src/ahriman/application/handlers/web.py

@@ -24,6 +24,7 @@ from collections.abc import Generator
 from ahriman.application.handlers import Handler
 from ahriman.core.configuration import Configuration
 from ahriman.core.spawn import Spawn
+from ahriman.core.triggers import TriggerLoader
 from ahriman.models.repository_id import RepositoryId
 
 
@@ -53,13 +54,16 @@ class Web(Handler):
         spawner = Spawn(args.parser(), list(spawner_args))
         spawner.start()
 
+        triggers = TriggerLoader.load(repository_id, configuration)
+        triggers.on_start()
+
         dummy_args = argparse.Namespace(
             architecture=None,
             configuration=args.configuration,
             repository=None,
             repository_id=None,
         )
-        repositories = cls.repositories_extract(dummy_args)
+        repositories = Web.repositories_extract(dummy_args)
         application = setup_server(configuration, spawner, repositories)
         run_server(application)
 

src/ahriman/core/database/migrations/m013_workers.py

@@ -0,0 +1,31 @@
+#
+# Copyright (c) 2021-2023 ahriman team.
+#
+# This file is part of ahriman
+# (see https://github.com/arcan1s/ahriman).
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+__all__ = ["steps"]
+
+
+steps = [
+    """
+    create table workers (
+        identifier text not null,
+        address text not null,
+        unique (identifier)
+    )
+    """
+]

src/ahriman/core/database/operations/__init__.py

@@ -25,3 +25,4 @@ from ahriman.core.database.operations.changes_operations import ChangesOperation
 from ahriman.core.database.operations.logs_operations import LogsOperations
 from ahriman.core.database.operations.package_operations import PackageOperations
 from ahriman.core.database.operations.patch_operations import PatchOperations
+from ahriman.core.database.operations.workers_operations import WorkersOperations

src/ahriman/core/database/operations/workers_operations.py

@@ -0,0 +1,83 @@
+#
+# Copyright (c) 2021-2023 ahriman team.
+#
+# This file is part of ahriman
+# (see https://github.com/arcan1s/ahriman).
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+from sqlite3 import Connection
+
+from ahriman.core.database.operations import Operations
+from ahriman.models.worker import Worker
+
+
+class WorkersOperations(Operations):
+    """
+    operations for remote workers
+    """
+
+    def workers_get(self) -> list[Worker]:
+        """
+        retrieve registered workers
+
+        Returns:
+            list[Worker]: list of available workers
+        """
+        def run(connection: Connection) -> list[Worker]:
+            return [
+                Worker(row["address"], identifier=row["identifier"])
+                for row in connection.execute("""select * from workers""")
+            ]
+
+        return self.with_connection(run)
+
+    def workers_insert(self, worker: Worker) -> None:
+        """
+        insert or update worker in database
+
+        Args:
+            worker(Worker): remote worker descriptor
+        """
+        def run(connection: Connection) -> None:
+            connection.execute(
+                """
+                insert into workers
+                (identifier, address)
+                values
+                (:identifier, :address)
+                on conflict (identifier) do update set
+                address = :address
+                """,
+                worker.view()
+            )
+
+        return self.with_connection(run, commit=True)
+
+    def workers_remove(self, identifier: str | None = None) -> None:
+        """
+        unregister remote worker
+
+        Args:
+            identifier(str | None, optional): remote worker identifier. If none set it will clear all workers
+                (Default value = None)
+        """
+        def run(connection: Connection) -> None:
+            connection.execute(
+                """
+                delete from workers where (:identifier is null or identifier = :identifier)
+                """,
+                {"identifier": identifier})
+
+        return self.with_connection(run, commit=True)

src/ahriman/core/database/sqlite.py

@@ -26,11 +26,12 @@ from typing import Self
 from ahriman.core.configuration import Configuration
 from ahriman.core.database.migrations import Migrations
 from ahriman.core.database.operations import AuthOperations, BuildOperations, ChangesOperations, LogsOperations, \
-    PackageOperations, PatchOperations
+    PackageOperations, PatchOperations, WorkersOperations
 
 
 # pylint: disable=too-many-ancestors
-class SQLite(AuthOperations, BuildOperations, ChangesOperations, LogsOperations, PackageOperations, PatchOperations):
+class SQLite(AuthOperations, BuildOperations, ChangesOperations, LogsOperations, PackageOperations, PatchOperations,
+             WorkersOperations):
     """
     wrapper for sqlite3 database
 

src/ahriman/core/distributed/__init__.py

@@ -0,0 +1,23 @@
+#
+# Copyright (c) 2021-2023 ahriman team.
+#
+# This file is part of ahriman
+# (see https://github.com/arcan1s/ahriman).
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+from ahriman.core.distributed.worker_loader_trigger import WorkerLoaderTrigger
+from ahriman.core.distributed.worker_register_trigger import WorkerRegisterTrigger
+from ahriman.core.distributed.worker_trigger import WorkerTrigger
+from ahriman.core.distributed.worker_unregister_trigger import WorkerUnregisterTrigger

src/ahriman/core/distributed/distributed_system.py

@@ -0,0 +1,170 @@
+#
+# Copyright (c) 2021-2023 ahriman team.
+#
+# This file is part of ahriman
+# (see https://github.com/arcan1s/ahriman).
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+import tempfile
+import uuid
+
+from pathlib import Path
+
+from ahriman.core.configuration import Configuration
+from ahriman.core.configuration.schema import ConfigurationSchema
+from ahriman.core.status.web_client import WebClient
+from ahriman.core.triggers import Trigger
+from ahriman.models.repository_id import RepositoryId
+from ahriman.models.worker import Worker
+
+
+class DistributedSystem(Trigger, WebClient):
+    """
+    simple class to (un)register itself as a distributed worker
+
+    Attributes:
+        identifier_path(Path): path to cached worker identifier
+        worker(Worker): unique self identifier
+    """
+
+    CONFIGURATION_SCHEMA: ConfigurationSchema = {
+        "worker": {
+            "type": "dict",
+            "schema": {
+                "address": {
+                    "type": "string",
+                    "required": True,
+                    "empty": False,
+                    "is_url": [],
+                },
+                "identifier": {
+                    "type": "string",
+                    "empty": False,
+                },
+                "identifier_path": {
+                    "type": "path",
+                    "coerce": "absolute_path",
+                },
+            },
+        },
+    }
+
+    def __init__(self, repository_id: RepositoryId, configuration: Configuration) -> None:
+        """
+        default constructor
+
+        Args:
+            repository_id(RepositoryId): repository unique identifier
+            configuration(Configuration): configuration instance
+        """
+        Trigger.__init__(self, repository_id, configuration)
+        WebClient.__init__(self, repository_id, configuration)
+
+        section = next(iter(self.configuration_sections(configuration)))
+        self.identifier_path = configuration.getpath(
+            section, "identifier_path", fallback=Path(tempfile.gettempdir()) / "ahriman-worker-identifier")
+        self._owe_identifier = False
+
+        identifier = self.load_identifier(configuration, section)
+        self.worker = Worker(configuration.get(section, "address"), identifier=identifier)
+
+    @classmethod
+    def configuration_sections(cls, configuration: Configuration) -> list[str]:
+        """
+        extract configuration sections from configuration
+
+        Args:
+            configuration(Configuration): configuration instance
+
+        Returns:
+            list[str]: read configuration sections belong to this trigger
+        """
+        return list(cls.CONFIGURATION_SCHEMA.keys())
+
+    def _workers_url(self, identifier: str = "") -> str:
+        """
+        workers url generator
+
+        Args:
+            identifier(str, optional): worker identifier (Default value = "")
+
+        Returns:
+            str: full url of web service for specific worker
+        """
+        suffix = f"/{identifier}" if identifier else ""
+        return f"{self.address}/api/v1/distributed{suffix}"
+
+    def load_identifier(self, configuration: Configuration, section: str) -> str:
+        """
+        load identifier from filesystem if available or from configuration otherwise. If cache file is available,
+        the method will read from it. Otherwise, it will try to read it from configuration. And, finally, if no
+        identifier set, it will generate uuid
+
+        Args:
+            configuration(Configuration): configuration instance
+            section(str): settings section name
+
+        Returns:
+            str: unique worker identifier
+        """
+        if self.identifier_path.is_file():  # load cached value
+            return self.identifier_path.read_text(encoding="utf8")
+        return configuration.get(section, "identifier", fallback=str(uuid.uuid4()))
+
+    def register(self, force: bool = False) -> None:
+        """
+        register itself in remote system
+
+        Args:
+            force(bool, optional): register worker even if it has been already registered before (Default value = False)
+        """
+        if self.identifier_path.is_file() and not force:
+            return  # there is already registered identifier
+
+        self.make_request("POST", self._workers_url(), json=self.worker.view())
+        # save identifier
+        self.identifier_path.write_text(self.worker.identifier, encoding="utf8")
+        self._owe_identifier = True
+        self.logger.info("registered instance %s at %s", self.worker, self.address)
+
+    def unregister(self, force: bool = False) -> None:
+        """
+        unregister itself in remote system
+
+        Args:
+            force(bool, optional): unregister worker even if it has been registered in another process
+                (Default value = False)
+        """
+        if not self._owe_identifier and not force:
+            return  # we do not owe this identifier
+
+        self.make_request("DELETE", self._workers_url(self.worker.identifier))
+        self.identifier_path.unlink(missing_ok=True)
+        self.logger.info("unregistered instance %s at %s", self.worker, self.address)
+
+    def workers(self) -> list[Worker]:
+        """
+        retrieve list of available remote workers
+
+        Returns:
+            list[Worker]: currently registered workers
+        """
+        response = self.make_request("GET", self._workers_url())
+        response_json = response.json()
+
+        return [
+            Worker(worker["address"], identifier=worker["identifier"])
+            for worker in response_json
+        ]

src/ahriman/core/distributed/worker_loader_trigger.py

@@ -0,0 +1,37 @@
+#
+# Copyright (c) 2021-2023 ahriman team.
+#
+# This file is part of ahriman
+# (see https://github.com/arcan1s/ahriman).
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+from ahriman.core.distributed.distributed_system import DistributedSystem
+
+
+class WorkerLoaderTrigger(DistributedSystem):
+    """
+    remote worker processor trigger (server side)
+    """
+
+    def on_start(self) -> None:
+        """
+        trigger action which will be called at the start of the application
+        """
+        if self.configuration.has_option("build", "workers"):
+            return  # there is manually set option
+
+        workers = [worker.address for worker in self.workers()]
+        self.logger.info("load workers %s", workers)
+        self.configuration.set_option("build", "workers", " ".join(workers))

src/ahriman/core/distributed/worker_register_trigger.py

@@ -0,0 +1,32 @@
+#
+# Copyright (c) 2021-2023 ahriman team.
+#
+# This file is part of ahriman
+# (see https://github.com/arcan1s/ahriman).
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+from ahriman.core.distributed.distributed_system import DistributedSystem
+
+
+class WorkerRegisterTrigger(DistributedSystem):
+    """
+    remote worker registration trigger
+    """
+
+    def on_start(self) -> None:
+        """
+        trigger action which will be called at the start of the application
+        """
+        self.register(force=True)

src/ahriman/core/distributed/worker_trigger.py

@@ -0,0 +1,38 @@
+#
+# Copyright (c) 2021-2023 ahriman team.
+#
+# This file is part of ahriman
+# (see https://github.com/arcan1s/ahriman).
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+from ahriman.core.distributed.distributed_system import DistributedSystem
+
+
+class WorkerTrigger(DistributedSystem):
+    """
+    remote worker processor trigger (client side)
+    """
+
+    def on_start(self) -> None:
+        """
+        trigger action which will be called at the start of the application
+        """
+        self.register()
+
+    def on_stop(self) -> None:
+        """
+        trigger action which will be called before the stop of the application
+        """
+        self.unregister()

src/ahriman/core/distributed/worker_unregister_trigger.py

@@ -0,0 +1,32 @@
+#
+# Copyright (c) 2021-2023 ahriman team.
+#
+# This file is part of ahriman
+# (see https://github.com/arcan1s/ahriman).
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+from ahriman.core.distributed.distributed_system import DistributedSystem
+
+
+class WorkerUnregisterTrigger(DistributedSystem):
+    """
+    remote worker registration trigger
+    """
+
+    def on_start(self) -> None:
+        """
+        trigger action which will be called at the start of the application
+        """
+        self.unregister(force=True)

src/ahriman/core/http/sync_http_client.py

@@ -47,8 +47,8 @@ class SyncHttpClient(LazyLogging):
         default constructor
 
         Args:
-            configuration(Configuration | None): configuration instance (Default value = None)
-            section(str, optional): settings section name (Default value = None)
+            configuration(Configuration | None, optional): configuration instance (Default value = None)
+            section(str | None, optional): settings section name (Default value = None)
             suppress_errors(bool, optional): suppress logging of request errors (Default value = False)
         """
         if configuration is None:

src/ahriman/core/status/watcher.py

@@ -26,6 +26,7 @@ from ahriman.models.log_record_id import LogRecordId
 from ahriman.models.package import Package
 from ahriman.models.pkgbuild_patch import PkgbuildPatch
 from ahriman.models.repository_id import RepositoryId
+from ahriman.models.worker import Worker
 
 
 class Watcher(LazyLogging):
@@ -223,3 +224,30 @@ class Watcher(LazyLogging):
             status(BuildStatusEnum): new service status
         """
         self.status = BuildStatus(status)
+
+    def workers_get(self) -> list[Worker]:
+        """
+        retrieve registered remote workers
+
+        Returns:
+            list[Worker]: list of currently available workers
+        """
+        return self.database.workers_get()
+
+    def workers_remove(self, identifier: str | None = None) -> None:
+        """
+        unregister remote worker
+
+        Args:
+            identifier(str | None, optional): remote worker identifier if any (Default value = None)
+        """
+        self.database.workers_remove(identifier)
+
+    def workers_update(self, worker: Worker) -> None:
+        """
+        register or update remote worker
+
+        Args:
+            worker(Worker): worker to register
+        """
+        self.database.workers_insert(worker)

src/ahriman/core/status/web_client.py

@@ -118,7 +118,6 @@ class WebClient(Client, SyncAhrimanClient):
         Returns:
             str: full url of web service for specific package base
         """
-        # in case if unix socket is used we need to normalize url
         suffix = f"/{package_base}" if package_base else ""
         return f"{self.address}/api/v1/packages{suffix}"
 

src/ahriman/models/worker.py

@@ -18,8 +18,11 @@
 # along with this program. If not, see <http://www.gnu.org/licenses/>.
 #
 from dataclasses import dataclass, field
+from typing import Any
 from urllib.parse import urlparse
 
+from ahriman.core.util import dataclass_view
+
 
 @dataclass(frozen=True)
 class Worker:
@@ -39,3 +42,12 @@ class Worker:
         update identifier based on settings
         """
         object.__setattr__(self, "identifier", self.identifier or urlparse(self.address).netloc)
+
+    def view(self) -> dict[str, Any]:
+        """
+        generate json patch view
+
+        Returns:
+            dict[str, Any]: json-friendly dictionary
+        """
+        return dataclass_view(self)

src/ahriman/web/schemas/__init__.py

@@ -47,5 +47,7 @@ from ahriman.web.schemas.remote_schema import RemoteSchema
 from ahriman.web.schemas.repository_id_schema import RepositoryIdSchema
 from ahriman.web.schemas.search_schema import SearchSchema
 from ahriman.web.schemas.status_schema import StatusSchema
-from ahriman.web.schemas.versioned_log_schema import VersionedLogSchema
 from ahriman.web.schemas.update_flags_schema import UpdateFlagsSchema
+from ahriman.web.schemas.versioned_log_schema import VersionedLogSchema
+from ahriman.web.schemas.worker_id_schema import WorkerIdSchema
+from ahriman.web.schemas.worker_schema import WorkerSchema

src/ahriman/web/schemas/worker_id_schema.py

@@ -0,0 +1,31 @@
+#
+# Copyright (c) 2021-2023 ahriman team.
+#
+# This file is part of ahriman
+# (see https://github.com/arcan1s/ahriman).
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+from marshmallow import Schema, fields
+
+
+class WorkerIdSchema(Schema):
+    """
+    request and response schema for workers
+    """
+
+    identifier = fields.String(required=True, metadata={
+        "description": "Worker unique identifier",
+        "example": "42f03a62-48f7-46b7-af40-dacc720e92fa",
+    })

src/ahriman/web/schemas/worker_schema.py

@@ -0,0 +1,33 @@
+#
+# Copyright (c) 2021-2023 ahriman team.
+#
+# This file is part of ahriman
+# (see https://github.com/arcan1s/ahriman).
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+from marshmallow import fields
+
+from ahriman.web.schemas.worker_id_schema import WorkerIdSchema
+
+
+class WorkerSchema(WorkerIdSchema):
+    """
+    request and response schema for workers
+    """
+
+    address = fields.String(required=True, metadata={
+        "description": "Worker address",
+        "example": "http://localhost:8081",
+    })

src/ahriman/web/views/v1/distributed/__init__.py

@@ -0,0 +1,19 @@
+#
+# Copyright (c) 2021-2023 ahriman team.
+#
+# This file is part of ahriman
+# (see https://github.com/arcan1s/ahriman).
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+#

src/ahriman/web/views/v1/distributed/worker.py

@@ -0,0 +1,99 @@
+#
+# Copyright (c) 2021-2023 ahriman team.
+#
+# This file is part of ahriman
+# (see https://github.com/arcan1s/ahriman).
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+import aiohttp_apispec  # type: ignore[import-untyped]
+
+from aiohttp.web import HTTPNoContent, HTTPNotFound, Response, json_response
+
+from ahriman.models.user_access import UserAccess
+from ahriman.web.schemas import AuthSchema, ErrorSchema, WorkerIdSchema, WorkerSchema
+from ahriman.web.views.base import BaseView
+
+
+class WorkerView(BaseView):
+    """
+    distributed worker view
+
+    Attributes:
+        DELETE_PERMISSION(UserAccess): (class attribute) delete permissions of self
+        GET_PERMISSION(UserAccess): (class attribute) get permissions of self
+    """
+
+    DELETE_PERMISSION = GET_PERMISSION = UserAccess.Full
+    ROUTES = ["/api/v1/distributed/{identifier}"]
+
+    @aiohttp_apispec.docs(
+        tags=["Distributed"],
+        summary="Unregister worker",
+        description="Unregister worker and remove it from the service",
+        responses={
+            204: {"description": "Success response"},
+            401: {"description": "Authorization required", "schema": ErrorSchema},
+            403: {"description": "Access is forbidden", "schema": ErrorSchema},
+            500: {"description": "Internal server error", "schema": ErrorSchema},
+        },
+        security=[{"token": [DELETE_PERMISSION]}],
+    )
+    @aiohttp_apispec.cookies_schema(AuthSchema)
+    @aiohttp_apispec.match_info_schema(WorkerIdSchema)
+    async def delete(self) -> None:
+        """
+        unregister worker
+
+        Raises:
+            HTTPNoContent: on success response
+        """
+        identifier = self.request.match_info["identifier"]
+        self.service().workers_remove(identifier)
+
+        raise HTTPNoContent
+
+    @aiohttp_apispec.docs(
+        tags=["Distributed"],
+        summary="Get worker",
+        description="Retrieve registered worker by its identifier",
+        responses={
+            200: {"description": "Success response", "schema": WorkerSchema(many=True)},
+            401: {"description": "Authorization required", "schema": ErrorSchema},
+            403: {"description": "Access is forbidden", "schema": ErrorSchema},
+            404: {"description": "Worker is unknown", "schema": ErrorSchema},
+            500: {"description": "Internal server error", "schema": ErrorSchema},
+        },
+        security=[{"token": [GET_PERMISSION]}],
+    )
+    @aiohttp_apispec.cookies_schema(AuthSchema)
+    @aiohttp_apispec.match_info_schema(WorkerIdSchema)
+    async def get(self) -> Response:
+        """
+        get worker by identifier
+
+        Returns:
+            Response: 200 with workers list on success
+
+        Raises:
+            HTTPNotFound: if no worker was found
+        """
+        identifier = self.request.match_info["identifier"]
+
+        try:
+            worker = next(worker for worker in self.service().workers_get() if worker.identifier == identifier)
+        except StopIteration:
+            raise HTTPNotFound(reason=f"Worker {identifier} not found")
+
+        return json_response([worker.view()])

src/ahriman/web/views/v1/distributed/workers.py

@@ -0,0 +1,126 @@
+#
+# Copyright (c) 2021-2023 ahriman team.
+#
+# This file is part of ahriman
+# (see https://github.com/arcan1s/ahriman).
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+import aiohttp_apispec  # type: ignore[import-untyped]
+
+from collections.abc import Callable
+from aiohttp.web import HTTPBadRequest, HTTPNoContent, Response, json_response
+
+from ahriman.models.user_access import UserAccess
+from ahriman.models.worker import Worker
+from ahriman.web.schemas import AuthSchema, ErrorSchema, WorkerSchema
+from ahriman.web.views.base import BaseView
+
+
+class WorkersView(BaseView):
+    """
+    distributed workers view
+
+    Attributes:
+        DELETE_PERMISSION(UserAccess): (class attribute) delete permissions of self
+        GET_PERMISSION(UserAccess): (class attribute) get permissions of self
+        POST_PERMISSION(UserAccess): (class attribute) post permissions of self
+    """
+
+    DELETE_PERMISSION = GET_PERMISSION = POST_PERMISSION = UserAccess.Full
+    ROUTES = ["/api/v1/distributed"]
+
+    @aiohttp_apispec.docs(
+        tags=["Distributed"],
+        summary="Unregister all workers",
+        description="Unregister and remove all known workers from the service",
+        responses={
+            204: {"description": "Success response"},
+            401: {"description": "Authorization required", "schema": ErrorSchema},
+            403: {"description": "Access is forbidden", "schema": ErrorSchema},
+            500: {"description": "Internal server error", "schema": ErrorSchema},
+        },
+        security=[{"token": [DELETE_PERMISSION]}],
+    )
+    @aiohttp_apispec.cookies_schema(AuthSchema)
+    async def delete(self) -> None:
+        """
+        unregister worker
+
+        Raises:
+            HTTPNoContent: on success response
+        """
+        self.service().workers_remove()
+
+        raise HTTPNoContent
+
+    @aiohttp_apispec.docs(
+        tags=["Distributed"],
+        summary="Get workers",
+        description="Retrieve registered workers",
+        responses={
+            200: {"description": "Success response", "schema": WorkerSchema(many=True)},
+            401: {"description": "Authorization required", "schema": ErrorSchema},
+            403: {"description": "Access is forbidden", "schema": ErrorSchema},
+            500: {"description": "Internal server error", "schema": ErrorSchema},
+        },
+        security=[{"token": [GET_PERMISSION]}],
+    )
+    @aiohttp_apispec.cookies_schema(AuthSchema)
+    async def get(self) -> Response:
+        """
+        get workers list
+
+        Returns:
+            Response: 200 with workers list on success
+        """
+        workers = self.service().workers_get()
+
+        comparator: Callable[[Worker], str] = lambda item: item.identifier
+        response = [worker.view() for worker in sorted(workers, key=comparator)]
+
+        return json_response(response)
+
+    @aiohttp_apispec.docs(
+        tags=["Distributed"],
+        summary="Register worker",
+        description="Register or update remote worker",
+        responses={
+            204: {"description": "Success response"},
+            400: {"description": "Bad data is supplied", "schema": ErrorSchema},
+            401: {"description": "Authorization required", "schema": ErrorSchema},
+            403: {"description": "Access is forbidden", "schema": ErrorSchema},
+            500: {"description": "Internal server error", "schema": ErrorSchema},
+        },
+        security=[{"token": [POST_PERMISSION]}],
+    )
+    @aiohttp_apispec.cookies_schema(AuthSchema)
+    @aiohttp_apispec.json_schema(WorkerSchema)
+    async def post(self) -> None:
+        """
+        register remote worker
+
+        Raises:
+            HTTPBadRequest: if bad data is supplied
+            HTTPNoContent: in case of success response
+        """
+        try:
+            data = await self.request.json()
+            worker = Worker(data["address"], identifier=data["identifier"])
+        except Exception as ex:
+            raise HTTPBadRequest(reason=str(ex))
+
+        self.service().workers_update(worker)
+
+        raise HTTPNoContent

tests/ahriman/application/handlers/test_handler_web.py

@@ -39,6 +39,7 @@ def test_run(args: argparse.Namespace, configuration: Configuration, repository:
     setup_mock = mocker.patch("ahriman.web.web.setup_server")
     run_mock = mocker.patch("ahriman.web.web.run_server")
     start_mock = mocker.patch("ahriman.core.spawn.Spawn.start")
+    trigger_mock = mocker.patch("ahriman.core.triggers.TriggerLoader.load")
     stop_mock = mocker.patch("ahriman.core.spawn.Spawn.stop")
     join_mock = mocker.patch("ahriman.core.spawn.Spawn.join")
     _, repository_id = configuration.check_loaded()
@@ -48,6 +49,8 @@ def test_run(args: argparse.Namespace, configuration: Configuration, repository:
     setup_mock.assert_called_once_with(configuration, pytest.helpers.anyvar(int), [repository_id])
     run_mock.assert_called_once_with(pytest.helpers.anyvar(int))
     start_mock.assert_called_once_with()
+    trigger_mock.assert_called_once_with(repository_id, configuration)
+    trigger_mock().on_start.assert_called_once_with()
     stop_mock.assert_called_once_with()
     join_mock.assert_called_once_with()
 

tests/ahriman/application/test_ahriman.py

@@ -1320,6 +1320,80 @@ def test_subparsers_service_tree_migrate(parser: argparse.ArgumentParser) -> Non
     assert not args.report
 
 
+def test_subparsers_service_worker_register(parser: argparse.ArgumentParser) -> None:
+    """
+    service-worker-register command must imply trigger
+    """
+    args = parser.parse_args(["service-worker-register"])
+    assert args.trigger == ["ahriman.core.distributed.WorkerRegisterTrigger"]
+
+
+def test_subparsers_service_worker_register_option_architecture(parser: argparse.ArgumentParser) -> None:
+    """
+    service-worker-register command must correctly parse architecture list
+    """
+    args = parser.parse_args(["service-worker-register"])
+    assert args.architecture is None
+    args = parser.parse_args(["-a", "x86_64", "service-worker-register"])
+    assert args.architecture == "x86_64"
+
+
+def test_subparsers_service_worker_register_option_repository(parser: argparse.ArgumentParser) -> None:
+    """
+    service-worker-register command must correctly parse repository list
+    """
+    args = parser.parse_args(["service-worker-register"])
+    assert args.repository is None
+    args = parser.parse_args(["-r", "repo", "service-worker-register"])
+    assert args.repository == "repo"
+
+
+def test_subparsers_service_worker_register_repo_triggers(parser: argparse.ArgumentParser) -> None:
+    """
+    service-worker-register must have same keys as repo-triggers
+    """
+    args = parser.parse_args(["service-worker-register"])
+    reference_args = parser.parse_args(["repo-triggers"])
+    assert dir(args) == dir(reference_args)
+
+
+def test_subparsers_service_worker_unregister(parser: argparse.ArgumentParser) -> None:
+    """
+    service-worker-unregister command must imply trigger
+    """
+    args = parser.parse_args(["service-worker-unregister"])
+    assert args.trigger == ["ahriman.core.distributed.WorkerUnregisterTrigger"]
+
+
+def test_subparsers_service_worker_unregister_option_architecture(parser: argparse.ArgumentParser) -> None:
+    """
+    service-worker-unregister command must correctly parse architecture list
+    """
+    args = parser.parse_args(["service-worker-unregister"])
+    assert args.architecture is None
+    args = parser.parse_args(["-a", "x86_64", "service-worker-unregister"])
+    assert args.architecture == "x86_64"
+
+
+def test_subparsers_service_worker_unregister_option_repository(parser: argparse.ArgumentParser) -> None:
+    """
+    service-worker-unregister command must correctly parse repository list
+    """
+    args = parser.parse_args(["service-worker-unregister"])
+    assert args.repository is None
+    args = parser.parse_args(["-r", "repo", "service-worker-unregister"])
+    assert args.repository == "repo"
+
+
+def test_subparsers_service_worker_unregister_repo_triggers(parser: argparse.ArgumentParser) -> None:
+    """
+    service-worker-unregister must have same keys as repo-triggers
+    """
+    args = parser.parse_args(["service-worker-unregister"])
+    reference_args = parser.parse_args(["repo-triggers"])
+    assert dir(args) == dir(reference_args)
+
+
 def test_subparsers_user_add(parser: argparse.ArgumentParser) -> None:
     """
     user-add command must imply action, architecture, exit code, lock, quiet, report and repository

tests/ahriman/core/database/migrations/test_m013_workers.py

@@ -0,0 +1,8 @@
+from ahriman.core.database.migrations.m013_workers import steps
+
+
+def test_migration_workers() -> None:
+    """
+    migration must not be empty
+    """
+    assert steps

tests/ahriman/core/database/operations/test_workers_operations.py

@@ -0,0 +1,46 @@
+from ahriman.core.database import SQLite
+from ahriman.models.worker import Worker
+
+
+def test_workers_get_insert(database: SQLite) -> None:
+    """
+    must insert workers to database
+    """
+    database.workers_insert(Worker("address1", identifier="1"))
+    database.workers_insert(Worker("address2", identifier="2"))
+    assert database.workers_get() == [
+        Worker("address1", identifier="1"), Worker("address2", identifier="2")
+    ]
+
+
+def test_workers_insert_remove(database: SQLite) -> None:
+    """
+    must remove worker from database
+    """
+    database.workers_insert(Worker("address1", identifier="1"))
+    database.workers_insert(Worker("address2", identifier="2"))
+    database.workers_remove("1")
+
+    assert database.workers_get() == [Worker("address2", identifier="2")]
+
+
+def test_workers_insert_remove_all(database: SQLite) -> None:
+    """
+    must remove all workers
+    """
+    database.workers_insert(Worker("address1", identifier="1"))
+    database.workers_insert(Worker("address2", identifier="2"))
+    database.workers_remove()
+
+    assert database.workers_get() == []
+
+
+def test_workers_insert_insert(database: SQLite) -> None:
+    """
+    must update worker in database
+    """
+    database.workers_insert(Worker("address1", identifier="1"))
+    assert database.workers_get() == [Worker("address1", identifier="1")]
+
+    database.workers_insert(Worker("address2", identifier="1"))
+    assert database.workers_get() == [Worker("address2", identifier="1")]

tests/ahriman/core/distributed/conftest.py

@@ -0,0 +1,20 @@
+import pytest
+
+from ahriman.core.configuration import Configuration
+from ahriman.core.distributed.distributed_system import DistributedSystem
+
+
+@pytest.fixture
+def distributed_system(configuration: Configuration) -> DistributedSystem:
+    """
+    distributed system fixture
+
+    Args:
+        configuration(Configuration): configuration fixture
+
+    Returns:
+        DistributedSystem: distributed system test instance
+    """
+    configuration.set_option("status", "address", "http://localhost:8081")
+    _, repository_id = configuration.check_loaded()
+    return DistributedSystem(repository_id, configuration)

tests/ahriman/core/distributed/test_distributed_system.py

@@ -0,0 +1,176 @@
+import json
+import requests
+
+from pytest_mock import MockerFixture
+
+from ahriman.core.configuration import Configuration
+from ahriman.core.distributed.distributed_system import DistributedSystem
+from ahriman.models.worker import Worker
+
+
+def test_identifier_path(configuration: Configuration) -> None:
+    """
+    must correctly set default identifier path
+    """
+    configuration.set_option("status", "address", "http://localhost:8081")
+    _, repository_id = configuration.check_loaded()
+    assert DistributedSystem(repository_id, configuration).identifier_path
+
+
+def test_configuration_sections(configuration: Configuration) -> None:
+    """
+    must correctly parse target list
+    """
+    assert DistributedSystem.configuration_sections(configuration) == ["worker"]
+
+
+def test_workers_url(distributed_system: DistributedSystem) -> None:
+    """
+    must generate workers url correctly
+    """
+    assert distributed_system._workers_url().startswith(distributed_system.address)
+    assert distributed_system._workers_url().endswith("/api/v1/distributed")
+
+    assert distributed_system._workers_url("id").startswith(distributed_system.address)
+    assert distributed_system._workers_url("id").endswith("/api/v1/distributed/id")
+
+
+def test_load_identifier(configuration: Configuration, mocker: MockerFixture) -> None:
+    """
+    must generate identifier
+    """
+    mocker.patch("pathlib.Path.is_file", return_value=False)
+    configuration.set_option("status", "address", "http://localhost:8081")
+    _, repository_id = configuration.check_loaded()
+    system = DistributedSystem(repository_id, configuration)
+
+    assert system.load_identifier(configuration, "worker")
+
+
+def test_load_identifier_configuration(configuration: Configuration, mocker: MockerFixture) -> None:
+    """
+    must load identifier from configuration
+    """
+    identifier = "id"
+    mocker.patch("pathlib.Path.is_file", return_value=False)
+    configuration.set_option("worker", "identifier", identifier)
+    configuration.set_option("status", "address", "http://localhost:8081")
+    _, repository_id = configuration.check_loaded()
+    system = DistributedSystem(repository_id, configuration)
+
+    assert system.worker.identifier == identifier
+
+
+def test_load_identifier_filesystem(configuration: Configuration, mocker: MockerFixture) -> None:
+    """
+    must load identifier from filesystem
+    """
+    identifier = "id"
+    mocker.patch("pathlib.Path.is_file", return_value=True)
+    read_mock = mocker.patch("pathlib.Path.read_text", return_value=identifier)
+    configuration.set_option("status", "address", "http://localhost:8081")
+    _, repository_id = configuration.check_loaded()
+    system = DistributedSystem(repository_id, configuration)
+
+    assert system.worker.identifier == identifier
+    read_mock.assert_called_once_with(encoding="utf8")
+
+
+def test_register(distributed_system: DistributedSystem, mocker: MockerFixture) -> None:
+    """
+    must register service
+    """
+    mocker.patch("pathlib.Path.is_file", return_value=False)
+    run_mock = mocker.patch("ahriman.core.distributed.distributed_system.DistributedSystem.make_request")
+    write_mock = mocker.patch("pathlib.Path.write_text")
+
+    distributed_system.register()
+    run_mock.assert_called_once_with("POST", f"{distributed_system.address}/api/v1/distributed",
+                                     json=distributed_system.worker.view())
+    write_mock.assert_called_once_with(distributed_system.worker.identifier, encoding="utf8")
+    assert distributed_system._owe_identifier
+
+
+def test_register_skip(distributed_system: DistributedSystem, mocker: MockerFixture) -> None:
+    """
+    must skip service registration if it doesn't owe the identifier
+    """
+    mocker.patch("pathlib.Path.is_file", return_value=True)
+    run_mock = mocker.patch("ahriman.core.distributed.distributed_system.DistributedSystem.make_request")
+    write_mock = mocker.patch("pathlib.Path.write_text")
+
+    distributed_system.register()
+    run_mock.assert_not_called()
+    write_mock.assert_not_called()
+    assert not distributed_system._owe_identifier
+
+
+def test_register_force(distributed_system: DistributedSystem, mocker: MockerFixture) -> None:
+    """
+    must register service even if it doesn't owe the identifier if force is supplied
+    """
+    mocker.patch("pathlib.Path.is_file", return_value=True)
+    run_mock = mocker.patch("ahriman.core.distributed.distributed_system.DistributedSystem.make_request")
+    write_mock = mocker.patch("pathlib.Path.write_text")
+
+    distributed_system.register(force=True)
+    run_mock.assert_called_once_with("POST", f"{distributed_system.address}/api/v1/distributed",
+                                     json=distributed_system.worker.view())
+    write_mock.assert_called_once_with(distributed_system.worker.identifier, encoding="utf8")
+    assert distributed_system._owe_identifier
+
+
+def test_unregister(distributed_system: DistributedSystem, mocker: MockerFixture) -> None:
+    """
+    must unregister service
+    """
+    run_mock = mocker.patch("ahriman.core.distributed.distributed_system.DistributedSystem.make_request")
+    remove_mock = mocker.patch("pathlib.Path.unlink")
+    distributed_system._owe_identifier = True
+
+    distributed_system.unregister()
+    run_mock.assert_called_once_with(
+        "DELETE", f"{distributed_system.address}/api/v1/distributed/{distributed_system.worker.identifier}")
+    remove_mock.assert_called_once_with(missing_ok=True)
+
+
+def test_unregister_skip(distributed_system: DistributedSystem, mocker: MockerFixture) -> None:
+    """
+    must skip service removal if it doesn't owe the identifier
+    """
+    run_mock = mocker.patch("ahriman.core.distributed.distributed_system.DistributedSystem.make_request")
+    remove_mock = mocker.patch("pathlib.Path.unlink")
+
+    distributed_system.unregister()
+    run_mock.assert_not_called()
+    remove_mock.assert_not_called()
+
+
+def test_unregister_force(distributed_system: DistributedSystem, mocker: MockerFixture) -> None:
+    """
+    must remove service even if it doesn't owe the identifier if force is supplied
+    """
+    run_mock = mocker.patch("ahriman.core.distributed.distributed_system.DistributedSystem.make_request")
+    remove_mock = mocker.patch("pathlib.Path.unlink")
+
+    distributed_system.unregister(force=True)
+    run_mock.assert_called_once_with(
+        "DELETE", f"{distributed_system.address}/api/v1/distributed/{distributed_system.worker.identifier}")
+    remove_mock.assert_called_once_with(missing_ok=True)
+
+
+def test_workers_get(distributed_system: DistributedSystem, mocker: MockerFixture) -> None:
+    """
+    must return available remote workers
+    """
+    worker = Worker("remote")
+    response_obj = requests.Response()
+    response_obj._content = json.dumps([worker.view()]).encode("utf8")
+    response_obj.status_code = 200
+
+    requests_mock = mocker.patch("ahriman.core.status.web_client.WebClient.make_request",
+                                 return_value=response_obj)
+
+    result = distributed_system.workers()
+    requests_mock.assert_called_once_with("GET", distributed_system._workers_url())
+    assert result == [worker]

tests/ahriman/core/distributed/test_worker_loader_trigger.py

@@ -0,0 +1,34 @@
+from pytest_mock import MockerFixture
+
+from ahriman.core.configuration import Configuration
+from ahriman.core.distributed import WorkerLoaderTrigger
+from ahriman.models.worker import Worker
+
+
+def test_on_start(configuration: Configuration, mocker: MockerFixture) -> None:
+    """
+    must load workers from remote
+    """
+    worker = Worker("address")
+    configuration.set_option("status", "address", "http://localhost:8081")
+    run_mock = mocker.patch("ahriman.core.distributed.WorkerLoaderTrigger.workers", return_value=[worker])
+    _, repository_id = configuration.check_loaded()
+
+    trigger = WorkerLoaderTrigger(repository_id, configuration)
+    trigger.on_start()
+    run_mock.assert_called_once_with()
+    assert configuration.getlist("build", "workers") == [worker.address]
+
+
+def test_on_start_skip(configuration: Configuration, mocker: MockerFixture) -> None:
+    """
+    must skip loading if option is already set
+    """
+    configuration.set_option("status", "address", "http://localhost:8081")
+    configuration.set_option("build", "workers", "address")
+    run_mock = mocker.patch("ahriman.core.distributed.WorkerLoaderTrigger.workers")
+    _, repository_id = configuration.check_loaded()
+
+    trigger = WorkerLoaderTrigger(repository_id, configuration)
+    trigger.on_start()
+    run_mock.assert_not_called()

tests/ahriman/core/distributed/test_worker_register_trigger.py

@@ -0,0 +1,17 @@
+from pytest_mock import MockerFixture
+
+from ahriman.core.configuration import Configuration
+from ahriman.core.distributed import WorkerRegisterTrigger
+
+
+def test_on_start(configuration: Configuration, mocker: MockerFixture) -> None:
+    """
+    must register itself as worker
+    """
+    configuration.set_option("status", "address", "http://localhost:8081")
+    run_mock = mocker.patch("ahriman.core.distributed.WorkerRegisterTrigger.register")
+    _, repository_id = configuration.check_loaded()
+
+    trigger = WorkerRegisterTrigger(repository_id, configuration)
+    trigger.on_start()
+    run_mock.assert_called_once_with(force=True)

tests/ahriman/core/distributed/test_worker_trigger.py

@@ -0,0 +1,30 @@
+from pytest_mock import MockerFixture
+
+from ahriman.core.configuration import Configuration
+from ahriman.core.distributed import WorkerTrigger
+
+
+def test_on_start(configuration: Configuration, mocker: MockerFixture) -> None:
+    """
+    must register itself as worker
+    """
+    configuration.set_option("status", "address", "http://localhost:8081")
+    run_mock = mocker.patch("ahriman.core.distributed.WorkerTrigger.register")
+    _, repository_id = configuration.check_loaded()
+
+    trigger = WorkerTrigger(repository_id, configuration)
+    trigger.on_start()
+    run_mock.assert_called_once_with()
+
+
+def test_on_stop(configuration: Configuration, mocker: MockerFixture) -> None:
+    """
+    must unregister itself as worker
+    """
+    configuration.set_option("status", "address", "http://localhost:8081")
+    run_mock = mocker.patch("ahriman.core.distributed.WorkerTrigger.unregister")
+    _, repository_id = configuration.check_loaded()
+
+    trigger = WorkerTrigger(repository_id, configuration)
+    trigger.on_stop()
+    run_mock.assert_called_once_with()

tests/ahriman/core/distributed/test_worker_unregister_trigger.py

@@ -0,0 +1,17 @@
+from pytest_mock import MockerFixture
+
+from ahriman.core.configuration import Configuration
+from ahriman.core.distributed import WorkerUnregisterTrigger
+
+
+def test_on_start(configuration: Configuration, mocker: MockerFixture) -> None:
+    """
+    must unregister itself as worker
+    """
+    configuration.set_option("status", "address", "http://localhost:8081")
+    run_mock = mocker.patch("ahriman.core.distributed.WorkerUnregisterTrigger.unregister")
+    _, repository_id = configuration.check_loaded()
+
+    trigger = WorkerUnregisterTrigger(repository_id, configuration)
+    trigger.on_start()
+    run_mock.assert_called_once_with(force=True)

tests/ahriman/core/status/test_watcher.py

@@ -10,6 +10,7 @@ from ahriman.models.changes import Changes
 from ahriman.models.log_record_id import LogRecordId
 from ahriman.models.package import Package
 from ahriman.models.pkgbuild_patch import PkgbuildPatch
+from ahriman.models.worker import Worker
 
 
 def test_load(watcher: Watcher, package_ahriman: Package, mocker: MockerFixture) -> None:
@@ -227,3 +228,40 @@ def test_status_update(watcher: Watcher) -> None:
     """
     watcher.status_update(BuildStatusEnum.Success)
     assert watcher.status.status == BuildStatusEnum.Success
+
+
+def test_workers_get(watcher: Watcher, mocker: MockerFixture) -> None:
+    """
+    must retrieve workers
+    """
+    worker = Worker("remote")
+    worker_mock = mocker.patch("ahriman.core.database.SQLite.workers_get", return_value=[worker])
+
+    assert watcher.workers_get() == [worker]
+    worker_mock.assert_called_once_with()
+
+
+def test_workers_remove(watcher: Watcher, mocker: MockerFixture) -> None:
+    """
+    must remove workers
+    """
+    identifier = "identifier"
+    worker_mock = mocker.patch("ahriman.core.database.SQLite.workers_remove")
+
+    watcher.workers_remove(identifier)
+    watcher.workers_remove()
+    worker_mock.assert_has_calls([
+        MockCall(identifier),
+        MockCall(None),
+    ])
+
+
+def test_workers_update(watcher: Watcher, mocker: MockerFixture) -> None:
+    """
+    must update workers
+    """
+    worker = Worker("remote")
+    worker_mock = mocker.patch("ahriman.core.database.SQLite.workers_insert")
+
+    watcher.workers_update(worker)
+    worker_mock.assert_called_once_with(worker)

tests/ahriman/core/status/test_web_client.py

@@ -12,6 +12,7 @@ from ahriman.models.changes import Changes
 from ahriman.models.internal_status import InternalStatus
 from ahriman.models.log_record_id import LogRecordId
 from ahriman.models.package import Package
+from ahriman.models.worker import Worker
 
 
 def test_parse_address(configuration: Configuration) -> None:
@@ -32,14 +33,6 @@ def test_parse_address(configuration: Configuration) -> None:
     assert WebClient.parse_address(configuration) == ("status", "http://localhost:8082")
 
 
-def test_status_url(web_client: WebClient) -> None:
-    """
-    must generate package status url correctly
-    """
-    assert web_client._status_url().startswith(web_client.address)
-    assert web_client._status_url().endswith("/api/v1/status")
-
-
 def test_changes_url(web_client: WebClient, package_ahriman: Package) -> None:
     """
     must generate changes url correctly
@@ -67,6 +60,14 @@ def test_package_url(web_client: WebClient, package_ahriman: Package) -> None:
     assert web_client._package_url(package_ahriman.base).endswith(f"/api/v1/packages/{package_ahriman.base}")
 
 
+def test_status_url(web_client: WebClient) -> None:
+    """
+    must generate package status url correctly
+    """
+    assert web_client._status_url().startswith(web_client.address)
+    assert web_client._status_url().endswith("/api/v1/status")
+
+
 def test_package_add(web_client: WebClient, package_ahriman: Package, mocker: MockerFixture) -> None:
     """
     must process package addition

tests/ahriman/models/test_worker.py

@@ -8,3 +8,17 @@ def test_post_init() -> None:
     assert Worker("http://localhost:8080").identifier == "localhost:8080"
     assert Worker("remote").identifier == ""  # not a valid url
     assert Worker("remote", identifier="id").identifier == "id"
+
+
+def test_view() -> None:
+    """
+    must generate json view
+    """
+    worker = Worker("address")
+    assert worker.view() == {"address": worker.address, "identifier": worker.identifier}
+
+    worker = Worker("http://localhost:8080")
+    assert worker.view() == {"address": worker.address, "identifier": worker.identifier}
+
+    worker = Worker("http://localhost:8080", identifier="abc")
+    assert worker.view() == {"address": worker.address, "identifier": worker.identifier}

tests/ahriman/web/schemas/test_worker_id_schema.py

@@ -0,0 +1 @@
+# schema testing goes in view class tests

tests/ahriman/web/schemas/test_worker_schema.py

@@ -0,0 +1 @@
+# schema testing goes in view class tests

tests/ahriman/web/views/v1/distributed/test_view_v1_distributed_worker.py

@@ -0,0 +1,70 @@
+import pytest
+
+from aiohttp.test_utils import TestClient
+
+from ahriman.models.user_access import UserAccess
+from ahriman.models.worker import Worker
+from ahriman.web.views.v1.distributed.worker import WorkerView
+
+
+async def test_get_permission() -> None:
+    """
+    must return correct permission for the request
+    """
+    for method in ("DELETE", "GET"):
+        request = pytest.helpers.request("", "", method)
+        assert await WorkerView.get_permission(request) == UserAccess.Full
+
+
+def test_routes() -> None:
+    """
+    must return correct routes
+    """
+    assert WorkerView.ROUTES == ["/api/v1/distributed/{identifier}"]
+
+
+async def test_delete(client: TestClient) -> None:
+    """
+    must delete single worker
+    """
+    await client.post("/api/v1/distributed", json={"address": "address1", "identifier": "1"})
+    await client.post("/api/v1/distributed", json={"address": "address2", "identifier": "2"})
+
+    response = await client.delete("/api/v1/distributed/1")
+    assert response.status == 204
+
+    response = await client.get("/api/v1/distributed/1")
+    assert response.status == 404
+
+    response = await client.get("/api/v1/distributed/2")
+    assert response.ok
+
+
+async def test_get(client: TestClient) -> None:
+    """
+    must return specific worker
+    """
+    worker = Worker("address1", identifier="1")
+
+    await client.post("/api/v1/distributed", json=worker.view())
+    await client.post("/api/v1/distributed", json={"address": "address2", "identifier": "2"})
+    response_schema = pytest.helpers.schema_response(WorkerView.get)
+
+    response = await client.get(f"/api/v1/distributed/{worker.identifier}")
+    assert response.ok
+    json = await response.json()
+    assert not response_schema.validate(json, many=True)
+
+    workers = [Worker(item["address"], identifier=item["identifier"]) for item in json]
+    assert workers == [worker]
+
+
+async def test_get_not_found(client: TestClient) -> None:
+    """
+    must return Not Found for unknown package
+    """
+    response_schema = pytest.helpers.schema_response(WorkerView.get, code=404)
+
+    response = await client.get("/api/v1/distributed/1")
+    assert response.status == 404
+    assert not response_schema.validate(await response.json())

tests/ahriman/web/views/v1/distributed/test_view_v1_distributed_workers.py

@@ -0,0 +1,83 @@
+import pytest
+
+from aiohttp.test_utils import TestClient
+
+from ahriman.models.user_access import UserAccess
+from ahriman.models.worker import Worker
+from ahriman.web.views.v1.distributed.workers import WorkersView
+
+
+async def test_get_permission() -> None:
+    """
+    must return correct permission for the request
+    """
+    for method in ("DELETE", "GET", "POST"):
+        request = pytest.helpers.request("", "", method)
+        assert await WorkersView.get_permission(request) == UserAccess.Full
+
+
+def test_routes() -> None:
+    """
+    must return correct routes
+    """
+    assert WorkersView.ROUTES == ["/api/v1/distributed"]
+
+
+async def test_delete(client: TestClient) -> None:
+    """
+    must delete all workers
+    """
+    await client.post("/api/v1/distributed", json={"address": "address1", "identifier": "1"})
+    await client.post("/api/v1/distributed", json={"address": "address2", "identifier": "2"})
+
+    response = await client.delete("/api/v1/distributed")
+    assert response.status == 204
+
+    response = await client.get("/api/v1/distributed")
+    json = await response.json()
+    assert not json
+
+
+async def test_get(client: TestClient) -> None:
+    """
+    must return all workers
+    """
+    await client.post("/api/v1/distributed", json={"address": "address1", "identifier": "1"})
+    await client.post("/api/v1/distributed", json={"address": "address2", "identifier": "2"})
+    response_schema = pytest.helpers.schema_response(WorkersView.get)
+
+    response = await client.get("/api/v1/distributed")
+    assert response.ok
+    json = await response.json()
+    assert not response_schema.validate(json, many=True)
+
+    workers = [Worker(item["address"], identifier=item["identifier"]) for item in json]
+    assert workers == [Worker("address1", identifier="1"), Worker("address2", identifier="2")]
+
+
+async def test_post(client: TestClient) -> None:
+    """
+    must update worker
+    """
+    worker = Worker("address1", identifier="1")
+    request_schema = pytest.helpers.schema_request(WorkersView.post)
+
+    payload = worker.view()
+    assert not request_schema.validate(payload)
+
+    response = await client.post("/api/v1/distributed", json=payload)
+    assert response.status == 204
+
+    response = await client.get(f"/api/v1/distributed/{worker.identifier}")
+    assert response.ok
+
+
+async def test_post_exception(client: TestClient) -> None:
+    """
+    must raise exception on invalid payload
+    """
+    response_schema = pytest.helpers.schema_response(WorkersView.post, code=400)
+
+    response = await client.post("/api/v1/distributed", json={})
+    assert response.status == 400
+    assert not response_schema.validate(await response.json())

tests/testresources/core/ahriman.ini

@@ -116,3 +116,6 @@ enable_archive_upload = yes
 host = 127.0.0.1
 static_path = ../web/templates/static
 templates = ../web/templates
+
+[worker]
+address = http://localhost:8081