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	diff --git a/mypy.ini b/mypy.ini
	--- a/mypy.ini
	+++ b/mypy.ini
	@@ -17,6 +17,9 @@
	[mypy-msgpack.*]
	ignore_missing_imports = True

	+[mypy-pika.*]
	+ignore_missing_imports = True
	+
	[mypy-pkg_resources.*]
	ignore_missing_imports = True

	diff --git a/swh/provenance/__init__.py b/swh/provenance/__init__.py
	--- a/swh/provenance/__init__.py
	+++ b/swh/provenance/__init__.py
	@@ -92,4 +92,12 @@
	engine = kwargs.get("engine", "pymongo")
	return ProvenanceStorageMongoDb(engine=engine, **kwargs["db"])

	+ elif cls == "rabbitmq":
	+ from .api.client import ProvenanceStorageRabbitMQClient
	+
	+ rmq_storage = ProvenanceStorageRabbitMQClient(**kwargs)
	+ if TYPE_CHECKING:
	+ assert isinstance(rmq_storage, ProvenanceStorageInterface)
	+ return rmq_storage
	+
	raise ValueError
	diff --git a/swh/provenance/api/client.py b/swh/provenance/api/client.py
	--- a/swh/provenance/api/client.py
	+++ b/swh/provenance/api/client.py
	@@ -2,3 +2,555 @@
	# See the AUTHORS file at the top-level directory of this distribution
	# License: GNU General Public License version 3, or any later version
	# See top-level LICENSE file for more information
	+
	+import functools
	+import inspect
	+import logging
	+import queue
	+import threading
	+import time
	+from typing import Any, Dict, Optional
	+import uuid
	+
	+import pika
	+import pika.channel
	+import pika.connection
	+import pika.frame
	+import pika.spec
	+
	+from swh.core.api.serializers import encode_data_client as encode_data
	+from swh.core.api.serializers import msgpack_loads as decode_data
	+from swh.core.statsd import statsd
	+
	+from .. import get_provenance_storage
	+from ..interface import ProvenanceStorageInterface
	+from .serializers import DECODERS, ENCODERS
	+from .server import ProvenanceStorageRabbitMQServer
	+
	+LOG_FORMAT = (
	+ "%(levelname) -10s %(asctime)s %(name) -30s %(funcName) "
	+ "-35s %(lineno) -5d: %(message)s"
	+)
	+LOGGER = logging.getLogger(__name__)
	+
	+STORAGE_DURATION_METRIC = "swh_provenance_storage_rabbitmq_duration_seconds"
	+
	+
	+class ConfigurationError(Exception):
	+ pass
	+
	+
	+class ResponseTimeout(Exception):
	+ pass
	+
	+
	+class TerminateSignal(Exception):
	+ pass
	+
	+
	+class MetaRabbitMQClient(type):
	+ def __new__(cls, name, bases, attributes):
	+ # For each method wrapped with @remote_api_endpoint in an API backend
	+ # (eg. :class:`swh.indexer.storage.IndexerStorage`), add a new
	+ # method in RemoteStorage, with the same documentation.
	+ #
	+ # Note that, despite the usage of decorator magic (eg. functools.wrap),
	+ # this never actually calls an IndexerStorage method.
	+ backend_class = attributes.get("backend_class", None)
	+ for base in bases:
	+ if backend_class is not None:
	+ break
	+ backend_class = getattr(base, "backend_class", None)
	+ if backend_class:
	+ for meth_name, meth in backend_class.__dict__.items():
	+ if hasattr(meth, "_endpoint_path"):
	+ cls.__add_endpoint(meth_name, meth, attributes)
	+ return super().__new__(cls, name, bases, attributes)
	+
	+ @staticmethod
	+ def __add_endpoint(meth_name, meth, attributes):
	+ wrapped_meth = inspect.unwrap(meth)
	+
	+ @functools.wraps(meth) # Copy signature and doc
	+ def meth_(args, *kwargs):
	+ with statsd.timed(
	+ metric=STORAGE_DURATION_METRIC, tags={"method": meth_name}
	+ ):
	+ # Match arguments and parameters
	+ data = inspect.getcallargs(wrapped_meth, args, *kwargs)
	+
	+ # Remove arguments that should not be passed
	+ self = data.pop("self")
	+
	+ # Call storage method with remaining arguments
	+ return getattr(self._storage, meth_name)(**data)
	+
	+ @functools.wraps(meth) # Copy signature and doc
	+ def write_meth_(args, *kwargs):
	+ with statsd.timed(
	+ metric=STORAGE_DURATION_METRIC, tags={"method": meth_name}
	+ ):
	+ # Match arguments and parameters
	+ post_data = inspect.getcallargs(wrapped_meth, args, *kwargs)
	+
	+ try:
	+ # Remove arguments that should not be passed
	+ self = post_data.pop("self")
	+ relation = post_data.pop("relation", None)
	+ assert len(post_data) == 1
	+ if relation is not None:
	+ items = [
	+ (src, rel.dst, rel.path)
	+ for src, dsts in next(iter(post_data.values())).items()
	+ for rel in dsts
	+ ]
	+ else:
	+ data = next(iter(post_data.values()))
	+ items = (
	+ list(data.items())
	+ if isinstance(data, dict)
	+ else list({(item,) for item in data})
	+ )
	+
	+ acks_expected = len(items)
	+ self._correlation_id = str(uuid.uuid4())
	+ exchange = ProvenanceStorageRabbitMQServer.get_exchange(
	+ meth_name, relation
	+ )
	+ for item in items:
	+ routing_key = ProvenanceStorageRabbitMQServer.get_routing_key(
	+ item, meth_name, relation
	+ )
	+ # FIXME: this is running in a different thread! Hence, if
	+ # self._connection drops, there is no guarantee that the
	+ # request can be sent for the current elements. This
	+ # situation should be handled properly.
	+ self._connection.ioloop.add_callback_threadsafe(
	+ functools.partial(
	+ ProvenanceStorageRabbitMQClient.request,
	+ channel=self._channel,
	+ reply_to=self._callback_queue,
	+ exchange=exchange,
	+ routing_key=routing_key,
	+ correlation_id=self._correlation_id,
	+ data=item,
	+ )
	+ )
	+ return self.wait_for_acks(acks_expected)
	+ except BaseException as ex:
	+ self.request_termination(str(ex))
	+ return False
	+
	+ if meth_name not in attributes:
	+ attributes[meth_name] = (
	+ write_meth_
	+ if ProvenanceStorageRabbitMQServer.is_write_method(meth_name)
	+ else meth_
	+ )
	+
	+
	+class ProvenanceStorageRabbitMQClient(threading.Thread, metaclass=MetaRabbitMQClient):
	+ """This is an example publisher that will handle unexpected interactions
	+ with RabbitMQ such as channel and connection closures.
	+
	+ If RabbitMQ closes the connection, it will reopen it. You should
	+ look at the output, as there are limited reasons why the connection may
	+ be closed, which usually are tied to permission related issues or
	+ socket timeouts.
	+
	+ It uses delivery confirmations and illustrates one way to keep track of
	+ messages that have been sent and if they've been confirmed by RabbitMQ.
	+
	+ """
	+
	+ backend_class = ProvenanceStorageInterface
	+
	+ extra_type_decoders = DECODERS
	+ extra_type_encoders = ENCODERS
	+
	+ def __init__(self, url: str, storage_config: Dict[str, Any]) -> None:
	+ """Setup the example publisher object, passing in the URL we will use
	+ to connect to RabbitMQ.
	+
	+ :param str url: The URL for connecting to RabbitMQ
	+ :param str routing_key: The routing key name from which this worker will
	+ consume messages
	+ :param str storage_config: Configuration parameters for the underlying
	+ ``ProvenanceStorage`` object
	+
	+ """
	+ super().__init__()
	+
	+ self._connection = None
	+ self._callback_queue: Optional[str] = None
	+ self._channel = None
	+ self._closing = False
	+ self._consumer_tag = None
	+ self._consuming = False
	+ self._correlation_id = str(uuid.uuid4())
	+ self._prefetch_count = 100
	+
	+ self._response_queue: queue.Queue = queue.Queue()
	+ self._storage = get_provenance_storage(**storage_config)
	+ self._url = url
	+
	+ @statsd.timed(metric=STORAGE_DURATION_METRIC, tags={"method": "open"})
	+ def open(self) -> None:
	+ self.start()
	+ while self._callback_queue is None:
	+ time.sleep(0.1)
	+ self._storage.open()
	+
	+ @statsd.timed(metric=STORAGE_DURATION_METRIC, tags={"method": "close"})
	+ def close(self) -> None:
	+ assert self._connection is not None
	+ self._connection.ioloop.add_callback_threadsafe(self.request_termination)
	+ self.join()
	+ self._storage.close()
	+
	+ def request_termination(self, reason: str = "Normal shutdown") -> None:
	+ assert self._connection is not None
	+
	+ def termination_callback():
	+ raise TerminateSignal(reason)
	+
	+ self._connection.ioloop.add_callback_threadsafe(termination_callback)
	+
	+ def connect(self) -> pika.SelectConnection:
	+ """This method connects to RabbitMQ, returning the connection handle.
	+ When the connection is established, the on_connection_open method
	+ will be invoked by pika.
	+
	+ :rtype: pika.SelectConnection
	+
	+ """
	+ LOGGER.info("Connecting to %s", self._url)
	+ return pika.SelectConnection(
	+ parameters=pika.URLParameters(self._url),
	+ on_open_callback=self.on_connection_open,
	+ on_open_error_callback=self.on_connection_open_error,
	+ on_close_callback=self.on_connection_closed,
	+ )
	+
	+ def close_connection(self) -> None:
	+ assert self._connection is not None
	+ self._consuming = False
	+ if self._connection.is_closing or self._connection.is_closed:
	+ LOGGER.info("Connection is closing or already closed")
	+ else:
	+ LOGGER.info("Closing connection")
	+ self._connection.close()
	+
	+ def on_connection_open(self, _unused_connection: pika.SelectConnection) -> None:
	+ """This method is called by pika once the connection to RabbitMQ has
	+ been established. It passes the handle to the connection object in
	+ case we need it, but in this case, we'll just mark it unused.
	+
	+ :param pika.SelectConnection _unused_connection: The connection
	+
	+ """
	+ LOGGER.info("Connection opened")
	+ self.open_channel()
	+
	+ def on_connection_open_error(
	+ self, _unused_connection: pika.SelectConnection, err: Exception
	+ ) -> None:
	+ """This method is called by pika if the connection to RabbitMQ
	+ can't be established.
	+
	+ :param pika.SelectConnection _unused_connection: The connection
	+ :param Exception err: The error
	+
	+ """
	+ LOGGER.error("Connection open failed, reopening in 5 seconds: %s", err)
	+ assert self._connection is not None
	+ self._connection.ioloop.call_later(5, self._connection.ioloop.stop)
	+
	+ def on_connection_closed(self, _unused_connection: pika.SelectConnection, reason):
	+ """This method is invoked by pika when the connection to RabbitMQ is
	+ closed unexpectedly. Since it is unexpected, we will reconnect to
	+ RabbitMQ if it disconnects.
	+
	+ :param pika.connection.Connection connection: The closed connection obj
	+ :param Exception reason: exception representing reason for loss of
	+ connection.
	+
	+ """
	+ assert self._connection is not None
	+ self._channel = None
	+ if self._closing:
	+ self._connection.ioloop.stop()
	+ else:
	+ LOGGER.warning("Connection closed, reopening in 5 seconds: %s", reason)
	+ self._connection.ioloop.call_later(5, self._connection.ioloop.stop)
	+
	+ def open_channel(self) -> None:
	+ """Open a new channel with RabbitMQ by issuing the Channel.Open RPC
	+ command. When RabbitMQ responds that the channel is open, the
	+ on_channel_open callback will be invoked by pika.
	+
	+ """
	+ LOGGER.info("Creating a new channel")
	+ assert self._connection is not None
	+ self._connection.channel(on_open_callback=self.on_channel_open)
	+
	+ def on_channel_open(self, channel: pika.channel.Channel) -> None:
	+ """This method is invoked by pika when the channel has been opened.
	+ The channel object is passed in so we can make use of it.
	+
	+ Since the channel is now open, we'll declare the exchange to use.
	+
	+ :param pika.channel.Channel channel: The channel object
	+
	+ """
	+ LOGGER.info("Channel opened")
	+ self._channel = channel
	+ LOGGER.info("Adding channel close callback")
	+ assert self._channel is not None
	+ self._channel.add_on_close_callback(callback=self.on_channel_closed)
	+ self.setup_queue()
	+
	+ def on_channel_closed(
	+ self, channel: pika.channel.Channel, reason: Exception
	+ ) -> None:
	+ """Invoked by pika when RabbitMQ unexpectedly closes the channel.
	+ Channels are usually closed if you attempt to do something that
	+ violates the protocol, such as re-declare an exchange or queue with
	+ different parameters. In this case, we'll close the connection
	+ to shutdown the object.
	+
	+ :param pika.channel.Channel: The closed channel
	+ :param Exception reason: why the channel was closed
	+
	+ """
	+ LOGGER.warning("Channel %i was closed: %s", channel, reason)
	+ self.close_connection()
	+
	+ def setup_queue(self) -> None:
	+ """Setup the queue on RabbitMQ by invoking the Queue.Declare RPC
	+ command. When it is complete, the on_queue_declare_ok method will
	+ be invoked by pika.
	+
	+ """
	+ LOGGER.info("Declaring callback queue")
	+ assert self._channel is not None
	+ self._channel.queue_declare(
	+ queue="", exclusive=True, callback=self.on_queue_declare_ok
	+ )
	+
	+ def on_queue_declare_ok(self, frame: pika.frame.Method) -> None:
	+ """Method invoked by pika when the Queue.Declare RPC call made in
	+ setup_queue has completed. This method sets up the consumer prefetch
	+ to only be delivered one message at a time. The consumer must
	+ acknowledge this message before RabbitMQ will deliver another one.
	+ You should experiment with different prefetch values to achieve desired
	+ performance.
	+
	+ :param pika.frame.Method method_frame: The Queue.DeclareOk frame
	+
	+ """
	+ LOGGER.info("Binding queue to default exchanger")
	+ assert self._channel is not None
	+ self._callback_queue = frame.method.queue
	+ self._channel.basic_qos(
	+ prefetch_count=self._prefetch_count, callback=self.on_basic_qos_ok
	+ )
	+
	+ def on_basic_qos_ok(self, _unused_frame: pika.frame.Method) -> None:
	+ """Invoked by pika when the Basic.QoS method has completed. At this
	+ point we will start consuming messages by calling start_consuming
	+ which will invoke the needed RPC commands to start the process.
	+
	+ :param pika.frame.Method _unused_frame: The Basic.QosOk response frame
	+
	+ """
	+ LOGGER.info("QOS set to: %d", self._prefetch_count)
	+ self.start_consuming()
	+
	+ def start_consuming(self) -> None:
	+ """This method sets up the consumer by first calling
	+ add_on_cancel_callback so that the object is notified if RabbitMQ
	+ cancels the consumer. It then issues the Basic.Consume RPC command
	+ which returns the consumer tag that is used to uniquely identify the
	+ consumer with RabbitMQ. We keep the value to use it when we want to
	+ cancel consuming. The on_response method is passed in as a callback pika
	+ will invoke when a message is fully received.
	+
	+ """
	+ LOGGER.info("Issuing consumer related RPC commands")
	+ LOGGER.info("Adding consumer cancellation callback")
	+ assert self._channel is not None
	+ self._channel.add_on_cancel_callback(callback=self.on_consumer_cancelled)
	+ assert self._callback_queue is not None
	+ self._consumer_tag = self._channel.basic_consume(
	+ queue=self._callback_queue, on_message_callback=self.on_response
	+ )
	+ self._consuming = True
	+
	+ def on_consumer_cancelled(self, method_frame: pika.frame.Method) -> None:
	+ """Invoked by pika when RabbitMQ sends a Basic.Cancel for a consumer
	+ receiving messages.
	+
	+ :param pika.frame.Method method_frame: The Basic.Cancel frame
	+
	+ """
	+ LOGGER.info("Consumer was cancelled remotely, shutting down: %r", method_frame)
	+ if self._channel:
	+ self._channel.close()
	+
	+ def on_response(
	+ self,
	+ channel: pika.channel.Channel,
	+ deliver: pika.spec.Basic.Deliver,
	+ properties: pika.spec.BasicProperties,
	+ body: bytes,
	+ ) -> None:
	+ """Invoked by pika when a message is delivered from RabbitMQ. The
	+ channel is passed for your convenience. The deliver object that
	+ is passed in carries the exchange, routing key, delivery tag and
	+ a redelivered flag for the message. The properties passed in is an
	+ instance of BasicProperties with the message properties and the body
	+ is the message that was sent.
	+
	+ :param pika.channel.Channel channel: The channel object
	+ :param pika.spec.Basic.Deliver: deliver method
	+ :param pika.spec.BasicProperties: properties
	+ :param bytes body: The message body
	+
	+ """
	+ LOGGER.info(
	+ "Received message # %s from %s: %s",
	+ deliver.delivery_tag,
	+ properties.app_id,
	+ body,
	+ )
	+ self._response_queue.put(
	+ (
	+ properties.correlation_id,
	+ decode_data(body, extra_decoders=self.extra_type_decoders),
	+ )
	+ )
	+ LOGGER.info("Acknowledging message %s", deliver.delivery_tag)
	+ channel.basic_ack(delivery_tag=deliver.delivery_tag)
	+
	+ def stop_consuming(self) -> None:
	+ """Tell RabbitMQ that you would like to stop consuming by sending the
	+ Basic.Cancel RPC command.
	+
	+ """
	+ if self._channel:
	+ LOGGER.info("Sending a Basic.Cancel RPC command to RabbitMQ")
	+ self._channel.basic_cancel(self._consumer_tag, self.on_cancel_ok)
	+
	+ def on_cancel_ok(self, _unused_frame: pika.frame.Method) -> None:
	+ """This method is invoked by pika when RabbitMQ acknowledges the
	+ cancellation of a consumer. At this point we will close the channel.
	+ This will invoke the on_channel_closed method once the channel has been
	+ closed, which will in-turn close the connection.
	+
	+ :param pika.frame.Method _unused_frame: The Basic.CancelOk frame
	+ :param str\|unicode consumer_tag: Tag of the consumer to be stopped
	+
	+ """
	+ self._consuming = False
	+ LOGGER.info(
	+ "RabbitMQ acknowledged the cancellation of the consumer: %s",
	+ self._consumer_tag,
	+ )
	+ LOGGER.info("Closing the channel")
	+ assert self._channel is not None
	+ self._channel.close()
	+
	+ def run(self) -> None:
	+ """Run the example code by connecting and then starting the IOLoop."""
	+
	+ while not self._closing:
	+ try:
	+ self._connection = self.connect()
	+ assert self._connection is not None
	+ self._connection.ioloop.start()
	+ except KeyboardInterrupt:
	+ LOGGER.info("Connection closed by keyboard interruption, reopening")
	+ if self._connection is not None:
	+ self._connection.ioloop.stop()
	+ except TerminateSignal as ex:
	+ LOGGER.info("Termination requested: %s", ex)
	+ self.stop()
	+ if self._connection is not None and not self._connection.is_closed:
	+ # Finish closing
	+ self._connection.ioloop.start()
	+ except BaseException as ex:
	+ LOGGER.warning("Unexpected exception, terminating: %s", ex)
	+ self.stop()
	+ if self._connection is not None and not self._connection.is_closed:
	+ # Finish closing
	+ self._connection.ioloop.start()
	+ LOGGER.info("Stopped")
	+
	+ def stop(self) -> None:
	+ """Cleanly shutdown the connection to RabbitMQ by stopping the consumer
	+ with RabbitMQ. When RabbitMQ confirms the cancellation, on_cancel_ok
	+ will be invoked by pika, which will then closing the channel and
	+ connection. The IOLoop is started again because this method is invoked
	+ by raising a TerminateSignal exception. This exception stops the IOLoop
	+ which needs to be running for pika to communicate with RabbitMQ. All of
	+ the commands issued prior to starting the IOLoop will be buffered but
	+ not processed.
	+
	+ """
	+ assert self._connection is not None
	+ if not self._closing:
	+ self._closing = True
	+ LOGGER.info("Stopping")
	+ if self._consuming:
	+ self.stop_consuming()
	+ self._connection.ioloop.start()
	+ else:
	+ self._connection.ioloop.stop()
	+ LOGGER.info("Stopped")
	+
	+ @staticmethod
	+ def request(
	+ channel: pika.channel.Channel,
	+ reply_to: str,
	+ exchange: str,
	+ routing_key: str,
	+ correlation_id: str,
	+ **kwargs,
	+ ) -> None:
	+ channel.basic_publish(
	+ exchange=exchange,
	+ routing_key=routing_key,
	+ properties=pika.BasicProperties(
	+ content_type="application/msgpack",
	+ correlation_id=correlation_id,
	+ reply_to=reply_to,
	+ ),
	+ body=encode_data(
	+ kwargs,
	+ extra_encoders=ProvenanceStorageRabbitMQClient.extra_type_encoders,
	+ ),
	+ )
	+
	+ def wait_for_acks(self, acks_expected: int) -> bool:
	+ acks_received = 0
	+ while acks_received < acks_expected:
	+ try:
	+ acks_received += self.wait_for_response()
	+ except ResponseTimeout:
	+ LOGGER.warning(
	+ "Timed out waiting for acks, %s received, %s expected",
	+ acks_received,
	+ acks_expected,
	+ )
	+ return False
	+ return acks_received == acks_expected
	+
	+ def wait_for_response(self, timeout: float = 60.0) -> Any:
	+ while True:
	+ try:
	+ correlation_id, response = self._response_queue.get(timeout=timeout)
	+ if correlation_id == self._correlation_id:
	+ return response
	+ except queue.Empty:
	+ raise ResponseTimeout
	diff --git a/swh/provenance/api/server.py b/swh/provenance/api/server.py
	--- a/swh/provenance/api/server.py
	+++ b/swh/provenance/api/server.py
	@@ -3,10 +3,787 @@
	# License: GNU General Public License version 3, or any later version
	# See top-level LICENSE file for more information

	+from collections import Counter
	+from datetime import datetime
	+from enum import Enum
	+import functools
	+import logging
	+import multiprocessing
	import os
	-from typing import Any, Dict, Optional
	+import queue
	+import threading
	+from typing import Any, Callable
	+from typing import Counter as TCounter
	+from typing import Dict, Generator, Iterable, List, Optional, Set, Tuple, Union, cast
	+
	+import pika
	+import pika.channel
	+import pika.connection
	+import pika.exceptions
	+from pika.exchange_type import ExchangeType
	+import pika.frame
	+import pika.spec

	from swh.core import config
	+from swh.core.api.serializers import encode_data_client as encode_data
	+from swh.core.api.serializers import msgpack_loads as decode_data
	+from swh.model.model import Sha1Git
	+from swh.provenance import get_provenance_storage
	+from swh.provenance.interface import (
	+ EntityType,
	+ ProvenanceStorageInterface,
	+ RelationData,
	+ RelationType,
	+ RevisionData,
	+)
	+
	+from .serializers import DECODERS, ENCODERS
	+
	+LOG_FORMAT = (
	+ "%(levelname) -10s %(asctime)s %(name) -30s %(funcName) "
	+ "-35s %(lineno) -5d: %(message)s"
	+)
	+LOGGER = logging.getLogger(__name__)
	+
	+TERMINATE = object()
	+
	+
	+class ServerCommand(Enum):
	+ TERMINATE = "terminate"
	+ CONSUMING = "consuming"
	+
	+
	+class TerminateSignal(BaseException):
	+ pass
	+
	+
	+def resolve_dates(
	+ dates: Iterable[Union[Tuple[Sha1Git, Optional[datetime]], Tuple[Sha1Git]]]
	+) -> Dict[Sha1Git, Optional[datetime]]:
	+ result: Dict[Sha1Git, Optional[datetime]] = {}
	+ for row in dates:
	+ sha1 = row[0]
	+ date = (
	+ cast(Tuple[Sha1Git, Optional[datetime]], row)[1] if len(row) > 1 else None
	+ )
	+ known = result.setdefault(sha1, None)
	+ if date is not None and (known is None or date < known):
	+ result[sha1] = date
	+ return result
	+
	+
	+def resolve_revision(
	+ data: Iterable[Union[Tuple[Sha1Git, RevisionData], Tuple[Sha1Git]]]
	+) -> Dict[Sha1Git, RevisionData]:
	+ result: Dict[Sha1Git, RevisionData] = {}
	+ for row in data:
	+ sha1 = row[0]
	+ rev = (
	+ cast(Tuple[Sha1Git, RevisionData], row)[1]
	+ if len(row) > 1
	+ else RevisionData(date=None, origin=None)
	+ )
	+ known = result.setdefault(sha1, RevisionData(date=None, origin=None))
	+ value = known
	+ if rev.date is not None and (known.date is None or rev.date < known.date):
	+ value = RevisionData(date=rev.date, origin=value.origin)
	+ if rev.origin is not None:
	+ value = RevisionData(date=value.date, origin=rev.origin)
	+ if value != known:
	+ result[sha1] = value
	+ return result
	+
	+
	+def resolve_relation(
	+ data: Iterable[Tuple[Sha1Git, Sha1Git, bytes]]
	+) -> Dict[Sha1Git, Set[RelationData]]:
	+ result: Dict[Sha1Git, Set[RelationData]] = {}
	+ for src, dst, path in data:
	+ result.setdefault(src, set()).add(RelationData(dst=dst, path=path))
	+ return result
	+
	+
	+class ProvenanceStorageRabbitMQWorker(multiprocessing.Process):
	+ """This is an example publisher that will handle unexpected interactions
	+ with RabbitMQ such as channel and connection closures.
	+
	+ If RabbitMQ closes the connection, it will reopen it. You should
	+ look at the output, as there are limited reasons why the connection may
	+ be closed, which usually are tied to permission related issues or
	+ socket timeouts.
	+
	+ It uses delivery confirmations and illustrates one way to keep track of
	+ messages that have been sent and if they've been confirmed by RabbitMQ.
	+
	+ """
	+
	+ EXCHANGE_TYPE = ExchangeType.direct
	+
	+ extra_type_decoders = DECODERS
	+ extra_type_encoders = ENCODERS
	+
	+ def __init__(
	+ self, url: str, exchange: str, range: int, storage_config: Dict[str, Any]
	+ ) -> None:
	+ """Setup the example publisher object, passing in the URL we will use
	+ to connect to RabbitMQ.
	+
	+ :param str url: The URL for connecting to RabbitMQ
	+ :param str routing_key: The routing key name from which this worker will
	+ consume messages
	+ :param str storage_config: Configuration parameters for the underlying
	+ ``ProvenanceStorage`` object
	+
	+ """
	+ super().__init__(name=f"{exchange}_{range:x}")
	+
	+ self._connection = None
	+ self._channel = None
	+ self._closing = False
	+ self._consumer_tag: Dict[str, str] = {}
	+ self._consuming: Dict[str, bool] = {}
	+ self._prefetch_count = 100
	+
	+ self._url = url
	+ self._exchange = exchange
	+ self._binding_keys = list(
	+ ProvenanceStorageRabbitMQServer.get_binding_keys(self._exchange, range)
	+ )
	+ self._queues: Dict[str, str] = {}
	+ self._storage_config = storage_config
	+ self._batch_size = 100
	+
	+ self.command: multiprocessing.Queue = multiprocessing.Queue()
	+ self.signal: multiprocessing.Queue = multiprocessing.Queue()
	+
	+ def connect(self) -> pika.SelectConnection:
	+ """This method connects to RabbitMQ, returning the connection handle.
	+ When the connection is established, the on_connection_open method
	+ will be invoked by pika.
	+
	+ :rtype: pika.SelectConnection
	+
	+ """
	+ LOGGER.info("Connecting to %s", self._url)
	+ return pika.SelectConnection(
	+ parameters=pika.URLParameters(self._url),
	+ on_open_callback=self.on_connection_open,
	+ on_open_error_callback=self.on_connection_open_error,
	+ on_close_callback=self.on_connection_closed,
	+ )
	+
	+ def close_connection(self) -> None:
	+ assert self._connection is not None
	+ self._consuming = {binding_key: False for binding_key in self._binding_keys}
	+ if self._connection.is_closing or self._connection.is_closed:
	+ LOGGER.info("Connection is closing or already closed")
	+ else:
	+ LOGGER.info("Closing connection")
	+ self._connection.close()
	+
	+ def on_connection_open(self, _unused_connection: pika.SelectConnection) -> None:
	+ """This method is called by pika once the connection to RabbitMQ has
	+ been established. It passes the handle to the connection object in
	+ case we need it, but in this case, we'll just mark it unused.
	+
	+ :param pika.SelectConnection _unused_connection: The connection
	+
	+ """
	+ LOGGER.info("Connection opened")
	+ self.open_channel()
	+
	+ def on_connection_open_error(
	+ self, _unused_connection: pika.SelectConnection, err: Exception
	+ ) -> None:
	+ """This method is called by pika if the connection to RabbitMQ
	+ can't be established.
	+
	+ :param pika.SelectConnection _unused_connection: The connection
	+ :param Exception err: The error
	+
	+ """
	+ LOGGER.error("Connection open failed, reopening in 5 seconds: %s", err)
	+ assert self._connection is not None
	+ self._connection.ioloop.call_later(5, self._connection.ioloop.stop)
	+
	+ def on_connection_closed(self, _unused_connection: pika.SelectConnection, reason):
	+ """This method is invoked by pika when the connection to RabbitMQ is
	+ closed unexpectedly. Since it is unexpected, we will reconnect to
	+ RabbitMQ if it disconnects.
	+
	+ :param pika.connection.Connection connection: The closed connection obj
	+ :param Exception reason: exception representing reason for loss of
	+ connection.
	+
	+ """
	+ assert self._connection is not None
	+ self._channel = None
	+ if self._closing:
	+ self._connection.ioloop.stop()
	+ else:
	+ LOGGER.warning("Connection closed, reopening in 5 seconds: %s", reason)
	+ self._connection.ioloop.call_later(5, self._connection.ioloop.stop)
	+
	+ def open_channel(self) -> None:
	+ """Open a new channel with RabbitMQ by issuing the Channel.Open RPC
	+ command. When RabbitMQ responds that the channel is open, the
	+ on_channel_open callback will be invoked by pika.
	+
	+ """
	+ LOGGER.info("Creating a new channel")
	+ assert self._connection is not None
	+ self._connection.channel(on_open_callback=self.on_channel_open)
	+
	+ def on_channel_open(self, channel: pika.channel.Channel) -> None:
	+ """This method is invoked by pika when the channel has been opened.
	+ The channel object is passed in so we can make use of it.
	+
	+ Since the channel is now open, we'll declare the exchange to use.
	+
	+ :param pika.channel.Channel channel: The channel object
	+
	+ """
	+ LOGGER.info("Channel opened")
	+ self._channel = channel
	+ LOGGER.info("Adding channel close callback")
	+ assert self._channel is not None
	+ self._channel.add_on_close_callback(callback=self.on_channel_closed)
	+ self.setup_exchange()
	+
	+ def on_channel_closed(
	+ self, channel: pika.channel.Channel, reason: Exception
	+ ) -> None:
	+ """Invoked by pika when RabbitMQ unexpectedly closes the channel.
	+ Channels are usually closed if you attempt to do something that
	+ violates the protocol, such as re-declare an exchange or queue with
	+ different parameters. In this case, we'll close the connection
	+ to shutdown the object.
	+
	+ :param pika.channel.Channel: The closed channel
	+ :param Exception reason: why the channel was closed
	+
	+ """
	+ LOGGER.warning("Channel %i was closed: %s", channel, reason)
	+ self.close_connection()
	+
	+ def setup_exchange(self) -> None:
	+ """Setup the exchange on RabbitMQ by invoking the Exchange.Declare RPC
	+ command. When it is complete, the on_exchange_declare_ok method will
	+ be invoked by pika.
	+
	+ """
	+ LOGGER.info("Declaring exchange %s", self._exchange)
	+ assert self._channel is not None
	+ self._channel.exchange_declare(
	+ exchange=self._exchange,
	+ exchange_type=self.EXCHANGE_TYPE,
	+ callback=self.on_exchange_declare_ok,
	+ )
	+
	+ def on_exchange_declare_ok(self, _unused_frame: pika.frame.Method) -> None:
	+ """Invoked by pika when RabbitMQ has finished the Exchange.Declare RPC
	+ command.
	+
	+ :param pika.frame.Method unused_frame: Exchange.DeclareOk response frame
	+
	+ """
	+ LOGGER.info("Exchange declared: %s", self._exchange)
	+ self.setup_queues()
	+
	+ def setup_queues(self) -> None:
	+ """Setup the queues on RabbitMQ by invoking the Queue.Declare RPC
	+ command. When it is complete, the on_queue_declare_ok method will
	+ be invoked by pika.
	+
	+ """
	+ for binding_key in self._binding_keys:
	+ LOGGER.info("Declaring queue %s", binding_key)
	+ assert self._channel is not None
	+ callback = functools.partial(
	+ self.on_queue_declare_ok,
	+ binding_key=binding_key,
	+ )
	+ self._channel.queue_declare(queue=binding_key, callback=callback)
	+
	+ def on_queue_declare_ok(self, frame: pika.frame.Method, binding_key: str) -> None:
	+ """Method invoked by pika when the Queue.Declare RPC call made in
	+ setup_queue has completed. In this method we will bind the queue
	+ and exchange together with the routing key by issuing the Queue.Bind
	+ RPC command. When this command is complete, the on_bind_ok method will
	+ be invoked by pika.
	+
	+ :param pika.frame.Method frame: The Queue.DeclareOk frame
	+ :param str\|unicode binding_key: Binding key of the queue to declare
	+
	+ """
	+ LOGGER.info(
	+ "Binding queue %s to exchange %s with routing key %s",
	+ frame.method.queue,
	+ self._exchange,
	+ binding_key,
	+ )
	+ assert self._channel is not None
	+ callback = functools.partial(self.on_bind_ok, queue_name=frame.method.queue)
	+ self._queues[binding_key] = frame.method.queue
	+ self._channel.queue_bind(
	+ queue=frame.method.queue,
	+ exchange=self._exchange,
	+ routing_key=binding_key,
	+ callback=callback,
	+ )
	+
	+ def on_bind_ok(self, _unused_frame: pika.frame.Method, queue_name: str) -> None:
	+ """Invoked by pika when the Queue.Bind method has completed. At this
	+ point we will set the prefetch count for the channel.
	+
	+ :param pika.frame.Method _unused_frame: The Queue.BindOk response frame
	+ :param str\|unicode queue_name: The name of the queue to declare
	+
	+ """
	+ LOGGER.info("Queue bound: %s", queue_name)
	+ self.set_qos()
	+
	+ def set_qos(self) -> None:
	+ """This method sets up the consumer prefetch to only be delivered
	+ one message at a time. The consumer must acknowledge this message
	+ before RabbitMQ will deliver another one. You should experiment
	+ with different prefetch values to achieve desired performance.
	+
	+ """
	+ assert self._channel is not None
	+ self._channel.basic_qos(
	+ prefetch_count=self._prefetch_count, callback=self.on_basic_qos_ok
	+ )
	+
	+ def on_basic_qos_ok(self, _unused_frame: pika.frame.Method) -> None:
	+ """Invoked by pika when the Basic.QoS method has completed. At this
	+ point we will start consuming messages by calling start_consuming
	+ which will invoke the needed RPC commands to start the process.
	+
	+ :param pika.frame.Method _unused_frame: The Basic.QosOk response frame
	+
	+ """
	+ LOGGER.info("QOS set to: %d", self._prefetch_count)
	+ self.start_consuming()
	+
	+ def start_consuming(self) -> None:
	+ """This method sets up the consumer by first calling
	+ add_on_cancel_callback so that the object is notified if RabbitMQ
	+ cancels the consumer. It then issues the Basic.Consume RPC command
	+ which returns the consumer tag that is used to uniquely identify the
	+ consumer with RabbitMQ. We keep the value to use it when we want to
	+ cancel consuming. The on_request method is passed in as a callback pika
	+ will invoke when a message is fully received.
	+
	+ """
	+ LOGGER.info("Issuing consumer related RPC commands")
	+ LOGGER.info("Adding consumer cancellation callback")
	+ assert self._channel is not None
	+ self._channel.add_on_cancel_callback(callback=self.on_consumer_cancelled)
	+ for binding_key in self._binding_keys:
	+ self._consumer_tag[binding_key] = self._channel.basic_consume(
	+ queue=self._queues[binding_key], on_message_callback=self.on_request
	+ )
	+ self._consuming[binding_key] = True
	+ self.signal.put(ServerCommand.CONSUMING)
	+
	+ def on_consumer_cancelled(self, method_frame: pika.frame.Method) -> None:
	+ """Invoked by pika when RabbitMQ sends a Basic.Cancel for a consumer
	+ receiving messages.
	+
	+ :param pika.frame.Method method_frame: The Basic.Cancel frame
	+
	+ """
	+ LOGGER.info("Consumer was cancelled remotely, shutting down: %r", method_frame)
	+ if self._channel:
	+ self._channel.close()
	+
	+ def on_request(
	+ self,
	+ channel: pika.channel.Channel,
	+ deliver: pika.spec.Basic.Deliver,
	+ properties: pika.spec.BasicProperties,
	+ body: bytes,
	+ ) -> None:
	+ """Invoked by pika when a message is delivered from RabbitMQ. The
	+ channel is passed for your convenience. The deliver object that
	+ is passed in carries the exchange, routing key, delivery tag and
	+ a redelivered flag for the message. The properties passed in is an
	+ instance of BasicProperties with the message properties and the body
	+ is the message that was sent.
	+
	+ :param pika.channel.Channel channel: The channel object
	+ :param pika.spec.Basic.Deliver: deliver method
	+ :param pika.spec.BasicProperties: properties
	+ :param bytes body: The message body
	+
	+ """
	+ LOGGER.info(
	+ "Received message # %s from %s: %s",
	+ deliver.delivery_tag,
	+ properties.app_id,
	+ body,
	+ )
	+ # XXX: for some reason this function is returning lists instead of tuples
	+ # (the client send tuples)
	+ item = decode_data(data=body, extra_decoders=self.extra_type_decoders)["data"]
	+ self._request_queues[deliver.routing_key].put(
	+ (tuple(item), (properties.correlation_id, properties.reply_to))
	+ )
	+ LOGGER.info("Acknowledging message %s", deliver.delivery_tag)
	+ channel.basic_ack(delivery_tag=deliver.delivery_tag)
	+
	+ def stop_consuming(self) -> None:
	+ """Tell RabbitMQ that you would like to stop consuming by sending the
	+ Basic.Cancel RPC command.
	+
	+ """
	+ if self._channel:
	+ LOGGER.info("Sending a Basic.Cancel RPC command to RabbitMQ")
	+ for binding_key in self._binding_keys:
	+ callback = functools.partial(self.on_cancel_ok, binding_key=binding_key)
	+ self._channel.basic_cancel(
	+ self._consumer_tag[binding_key], callback=callback
	+ )
	+
	+ def on_cancel_ok(self, _unused_frame: pika.frame.Method, binding_key: str) -> None:
	+ """This method is invoked by pika when RabbitMQ acknowledges the
	+ cancellation of a consumer. At this point we will close the channel.
	+ This will invoke the on_channel_closed method once the channel has been
	+ closed, which will in-turn close the connection.
	+
	+ :param pika.frame.Method _unused_frame: The Basic.CancelOk frame
	+ :param str\|unicode binding_key: Binding key of of the consumer to be stopped
	+
	+ """
	+ self._consuming[binding_key] = False
	+ LOGGER.info(
	+ "RabbitMQ acknowledged the cancellation of the consumer: %s",
	+ self._consuming[binding_key],
	+ )
	+ LOGGER.info("Closing the channel")
	+ assert self._channel is not None
	+ self._channel.close()
	+
	+ def run(self) -> None:
	+ """Run the example code by connecting and then starting the IOLoop."""
	+
	+ self._command_thread = threading.Thread(target=self.run_command_thread)
	+ self._command_thread.start()
	+
	+ self._request_queues: Dict[str, queue.Queue] = {}
	+ self._request_threads: Dict[str, threading.Thread] = {}
	+ for binding_key in self._binding_keys:
	+ meth_name, relation = ProvenanceStorageRabbitMQServer.get_meth_name(
	+ binding_key
	+ )
	+ self._request_queues[binding_key] = queue.Queue()
	+ self._request_threads[binding_key] = threading.Thread(
	+ target=self.run_request_thread,
	+ args=(binding_key, meth_name, relation),
	+ )
	+ self._request_threads[binding_key].start()
	+
	+ while not self._closing:
	+ try:
	+ self._connection = self.connect()
	+ assert self._connection is not None
	+ self._connection.ioloop.start()
	+ except KeyboardInterrupt:
	+ LOGGER.info("Connection closed by keyboard interruption, reopening")
	+ if self._connection is not None:
	+ self._connection.ioloop.stop()
	+ except TerminateSignal as ex:
	+ LOGGER.info("Termination requested: %s", ex)
	+ self.stop()
	+ if self._connection is not None and not self._connection.is_closed:
	+ # Finish closing
	+ self._connection.ioloop.start()
	+ except BaseException as ex:
	+ LOGGER.warning("Unexpected exception, terminating: %s", ex)
	+ self.stop()
	+ if self._connection is not None and not self._connection.is_closed:
	+ # Finish closing
	+ self._connection.ioloop.start()
	+
	+ for binding_key in self._binding_keys:
	+ self._request_queues[binding_key].put(TERMINATE)
	+ for binding_key in self._binding_keys:
	+ self._request_threads[binding_key].join()
	+ self._command_thread.join()
	+ LOGGER.info("Stopped")
	+
	+ def run_command_thread(self) -> None:
	+ while True:
	+ try:
	+ command = self.command.get()
	+ if command == ServerCommand.TERMINATE:
	+ self.request_termination()
	+ break
	+ except queue.Empty:
	+ pass
	+ except BaseException as ex:
	+ self.request_termination(str(ex))
	+ break
	+
	+ def request_termination(self, reason: str = "Normal shutdown") -> None:
	+ assert self._connection is not None
	+
	+ def termination_callback():
	+ raise TerminateSignal(reason)
	+
	+ self._connection.ioloop.add_callback_threadsafe(termination_callback)
	+
	+ def run_request_thread(
	+ self, binding_key: str, meth_name: str, relation: Optional[RelationType]
	+ ) -> None:
	+ storage = get_provenance_storage(**self._storage_config)
	+ storage.open()
	+ request_queue = self._request_queues[binding_key]
	+ merge_items = ProvenanceStorageRabbitMQWorker.get_conflicts_func(meth_name)
	+ while True:
	+ terminate = False
	+ elements = []
	+ while True:
	+ try:
	+ # TODO: consider reducing this timeout or removing it
	+ elem = request_queue.get(timeout=0.1)
	+ if elem is TERMINATE:
	+ terminate = True
	+ break
	+ elements.append(elem)
	+ except queue.Empty:
	+ break
	+
	+ if len(elements) >= self._batch_size:
	+ break
	+
	+ if terminate:
	+ break
	+
	+ if not elements:
	+ continue
	+
	+ try:
	+ items, props = zip(*elements)
	+ acks_count: TCounter[Tuple[str, str]] = Counter(props)
	+ data = merge_items(items)
	+
	+ args = (relation, data) if relation is not None else (data,)
	+ if getattr(storage, meth_name)(*args):
	+ for (correlation_id, reply_to), count in acks_count.items():
	+ # FIXME: this is running in a different thread! Hence, if
	+ # self._connection drops, there is no guarantee that the
	+ # response can be sent for the current elements. This
	+ # situation should be handled properly.
	+ assert self._connection is not None
	+ self._connection.ioloop.add_callback_threadsafe(
	+ functools.partial(
	+ ProvenanceStorageRabbitMQServer.respond,
	+ channel=self._channel,
	+ correlation_id=correlation_id,
	+ reply_to=reply_to,
	+ response=count,
	+ )
	+ )
	+ else:
	+ LOGGER.warning(
	+ "Unable to process elements for queue %s", binding_key
	+ )
	+ for elem in elements:
	+ request_queue.put(elem)
	+ except BaseException as ex:
	+ self.request_termination(str(ex))
	+ break
	+ storage.close()
	+
	+ def stop(self) -> None:
	+ """Cleanly shutdown the connection to RabbitMQ by stopping the consumer
	+ with RabbitMQ. When RabbitMQ confirms the cancellation, on_cancel_ok
	+ will be invoked by pika, which will then closing the channel and
	+ connection. The IOLoop is started again because this method is invoked
	+ by raising a TerminateSignal exception. This exception stops the IOLoop
	+ which needs to be running for pika to communicate with RabbitMQ. All of
	+ the commands issued prior to starting the IOLoop will be buffered but
	+ not processed.
	+
	+ """
	+ assert self._connection is not None
	+ if not self._closing:
	+ self._closing = True
	+ LOGGER.info("Stopping")
	+ if any(self._consuming):
	+ self.stop_consuming()
	+ self._connection.ioloop.start()
	+ else:
	+ self._connection.ioloop.stop()
	+ LOGGER.info("Stopped")
	+
	+ @staticmethod
	+ def get_conflicts_func(meth_name: str) -> Callable[[Iterable[Any]], Any]:
	+ if meth_name in ["content_add", "directory_add"]:
	+ return resolve_dates
	+ elif meth_name == "location_add":
	+ return lambda data: set(data) # just remove duplicates
	+ elif meth_name == "origin_add":
	+ return lambda data: dict(data) # last processed value is good enough
	+ elif meth_name == "revision_add":
	+ return resolve_revision
	+ elif meth_name == "relation_add":
	+ return resolve_relation
	+ else:
	+ LOGGER.warning(
	+ "Unexpected conflict resolution function request for method %s",
	+ meth_name,
	+ )
	+ return lambda x: x
	+
	+
	+class ProvenanceStorageRabbitMQServer:
	+ backend_class = ProvenanceStorageInterface
	+ extra_type_decoders = DECODERS
	+ extra_type_encoders = ENCODERS
	+
	+ queue_count = 16
	+
	+ def __init__(self, url: str, storage_config: Dict[str, Any]) -> None:
	+ self._workers: List[ProvenanceStorageRabbitMQWorker] = []
	+ for exchange in ProvenanceStorageRabbitMQServer.get_exchanges():
	+ for range in ProvenanceStorageRabbitMQServer.get_ranges():
	+ worker = ProvenanceStorageRabbitMQWorker(
	+ url, exchange, range, storage_config
	+ )
	+ self._workers.append(worker)
	+ self._running = False
	+
	+ def start(self) -> None:
	+ if not self._running:
	+ self._running = True
	+ for worker in self._workers:
	+ worker.start()
	+ for worker in self._workers:
	+ try:
	+ signal = worker.signal.get(timeout=60)
	+ assert signal == ServerCommand.CONSUMING
	+ except queue.Empty:
	+ LOGGER.error(
	+ "Could not initialize worker %s. Leaving...", worker.name
	+ )
	+ self.stop()
	+ return
	+ LOGGER.info("Start serving")
	+
	+ def stop(self) -> None:
	+ if self._running:
	+ for worker in self._workers:
	+ worker.command.put(ServerCommand.TERMINATE)
	+ for worker in self._workers:
	+ worker.join()
	+ LOGGER.info("Stop serving")
	+ self._running = False
	+
	+ @staticmethod
	+ def ack(channel: pika.channel.Channel, delivery_tag: int) -> None:
	+ channel.basic_ack(delivery_tag=delivery_tag)
	+
	+ @staticmethod
	+ def get_binding_keys(exchange: str, range: int) -> Generator[str, None, None]:
	+ for meth_name, relation in ProvenanceStorageRabbitMQServer.get_meth_names(
	+ exchange
	+ ):
	+ if relation is None:
	+ yield f"{meth_name}.unknown.{range:x}".lower()
	+ else:
	+ yield f"{meth_name}.{relation.value}.{range:x}".lower()
	+
	+ @staticmethod
	+ def get_exchange(meth_name: str, relation: Optional[RelationType] = None) -> str:
	+ if meth_name == "relation_add":
	+ assert relation is not None
	+ split = relation.value
	+ else:
	+ split = meth_name
	+ exchange, *_ = split.split("_")
	+ return exchange
	+
	+ @staticmethod
	+ def get_exchanges() -> Generator[str, None, None]:
	+ yield from [entity.value for entity in EntityType] + ["location"]
	+
	+ @staticmethod
	+ def get_meth_name(
	+ binding_key: str,
	+ ) -> Tuple[str, Optional[RelationType]]:
	+ meth_name, relation, *_ = binding_key.split(".")
	+ return meth_name, (RelationType(relation) if relation != "unknown" else None)
	+
	+ @staticmethod
	+ def get_meth_names(
	+ exchange: str,
	+ ) -> Generator[Tuple[str, Optional[RelationType]], None, None]:
	+ if exchange == EntityType.CONTENT.value:
	+ yield from [
	+ ("content_add", None),
	+ ("relation_add", RelationType.CNT_EARLY_IN_REV),
	+ ("relation_add", RelationType.CNT_IN_DIR),
	+ ]
	+ elif exchange == EntityType.DIRECTORY.value:
	+ yield from [
	+ ("directory_add", None),
	+ ("relation_add", RelationType.DIR_IN_REV),
	+ ]
	+ elif exchange == EntityType.ORIGIN.value:
	+ yield from [("origin_add", None)]
	+ elif exchange == EntityType.REVISION.value:
	+ yield from [
	+ ("revision_add", None),
	+ ("relation_add", RelationType.REV_BEFORE_REV),
	+ ("relation_add", RelationType.REV_IN_ORG),
	+ ]
	+ elif exchange == "location":
	+ yield "location_add", None
	+
	+ @staticmethod
	+ def get_ranges() -> Generator[int, None, None]:
	+ yield from range(ProvenanceStorageRabbitMQServer.queue_count)
	+
	+ @staticmethod
	+ def get_routing_key(
	+ data: Tuple[bytes, ...], meth_name: str, relation: Optional[RelationType] = None
	+ ) -> str:
	+ idx = (
	+ int(data[0][0]) % ProvenanceStorageRabbitMQServer.queue_count
	+ if data and data[0]
	+ else 0
	+ )
	+ if relation is None:
	+ return f"{meth_name}.unknown.{idx:x}".lower()
	+ else:
	+ return f"{meth_name}.{relation.value}.{idx:x}".lower()
	+
	+ @staticmethod
	+ def is_write_method(meth_name: str) -> bool:
	+ return "_add" in meth_name
	+
	+ @staticmethod
	+ def respond(
	+ channel: pika.channel.Channel,
	+ correlation_id: str,
	+ reply_to: str,
	+ response: Any,
	+ ):
	+ channel.basic_publish(
	+ exchange="",
	+ routing_key=reply_to,
	+ properties=pika.BasicProperties(
	+ content_type="application/msgpack",
	+ correlation_id=correlation_id,
	+ ),
	+ body=encode_data(
	+ response,
	+ extra_encoders=ProvenanceStorageRabbitMQServer.extra_type_encoders,
	+ ),
	+ )


	def load_and_check_config(
	@@ -56,3 +833,12 @@
	raise KeyError("Invalid configuration; missing 'db' config entry")

	return cfg
	+
	+
	+def make_server_from_configfile() -> ProvenanceStorageRabbitMQServer:
	+ config_path = os.environ.get("SWH_CONFIG_FILENAME")
	+ server_cfg = load_and_check_config(config_path)
	+ return ProvenanceStorageRabbitMQServer(
	+ url=server_cfg["provenance"]["rabbitmq"]["url"],
	+ storage_config=server_cfg["provenance"]["storage"],
	+ )
	diff --git a/swh/provenance/cli.py b/swh/provenance/cli.py
	--- a/swh/provenance/cli.py
	+++ b/swh/provenance/cli.py
	@@ -42,18 +42,30 @@
	},
	"storage": {
	# Local PostgreSQL Storage
	- "cls": "postgresql",
	- "db": {
	- "host": "localhost",
	- "user": "postgres",
	- "password": "postgres",
	- "dbname": "provenance",
	- },
	+ # "cls": "postgresql",
	+ # "db": {
	+ # "host": "localhost",
	+ # "user": "postgres",
	+ # "password": "postgres",
	+ # "dbname": "provenance",
	+ # },
	# Local MongoDB Storage
	# "cls": "mongodb",
	# "db": {
	# "dbname": "provenance",
	# },
	+ # Remote RabbitMQ/PostgreSQL Storage
	+ "cls": "rabbitmq",
	+ "url": "amqp://localhost:5672/%2f",
	+ "storage_config": {
	+ "cls": "postgresql",
	+ "db": {
	+ "host": "localhost",
	+ "user": "postgres",
	+ "password": "postgres",
	+ "dbname": "provenance",
	+ },
	+ },
	},
	}
	}

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