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Fix the global unique ID generator recursive constructor call

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This commit is contained in:
Stanislav Hejny
2025-07-12 22:59:21 +01:00
parent dd590a11b5
commit 0e294b223d
8 changed files with 122 additions and 326 deletions
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amqp/adapter/consul_global_id_generator.py
+30 -36
View File
@@ -1,23 +1,17 @@
import os
import logging
import os
import random
import socket
import time
from typing import Optional
import consul
from amqp.config.amq_configuration import AMQConfiguration
import consul_kv
from amqp.config.amq_configuration import AMQAdapter
logger = logging.getLogger(__name__)
# Default configuration values for Adapter
DEFAULT_CONSUL_HOST = 'localhost'
DEFAULT_CONSUL_PORT = 8500
DEFAULT_CONSUL_COUNTER_KEY = 'adapter/ids/counter'
DEFAULT_MAX_RETRIES = 5
DEFAULT_RETRY_DELAY_SECONDS = 0.1
def get_config_values():
def get_config_values(config: AMQAdapter) -> tuple:
"""
Get configuration values from AMQConfiguration or environment variables.
@@ -25,22 +19,23 @@ def get_config_values():
tuple: (consul_host, consul_port, consul_counter_key, max_retries, retry_delay_seconds)
"""
try:
config = AMQConfiguration("application.properties")
consul_host = os.environ.get('CONSUL_HOST', DEFAULT_CONSUL_HOST)
consul_port = int(os.environ.get('CONSUL_PORT', DEFAULT_CONSUL_PORT))
consul_counter_key = os.environ.get('CONSUL_COUNTER_KEY', DEFAULT_CONSUL_COUNTER_KEY)
max_retries = int(os.environ.get('CONSUL_MAX_RETRIES', DEFAULT_MAX_RETRIES))
retry_delay_seconds = float(os.environ.get('CONSUL_RETRY_DELAY_SECONDS', DEFAULT_RETRY_DELAY_SECONDS))
consul_host = config.consul_host
consul_port = config.consul_port
consul_counter_key = config.consul_counter_key
max_retries = config.consul_max_retries
retry_delay_seconds = config.consul_initial_retry_delay
return consul_host, consul_port, consul_counter_key, max_retries, retry_delay_seconds
except Exception as e:
logger.warning(f"Failed to load configuration: {str(e)}. Using default values.")
return (
os.environ.get('CONSUL_HOST', DEFAULT_CONSUL_HOST),
int(os.environ.get('CONSUL_PORT', DEFAULT_CONSUL_PORT)),
os.environ.get('CONSUL_COUNTER_KEY', DEFAULT_CONSUL_COUNTER_KEY),
int(os.environ.get('CONSUL_MAX_RETRIES', DEFAULT_MAX_RETRIES)),
float(os.environ.get('CONSUL_RETRY_DELAY_SECONDS', DEFAULT_RETRY_DELAY_SECONDS))
os.environ.get("CONSUL_HOST", consul_kv.settings.DEFAULT_ENDPOINT.split(":")[0]),
int(os.environ.get("CONSUL_PORT", consul_kv.settings.DEFAULT_ENDPOINT.split(":")[1])),
os.environ.get("CONSUL_COUNTER_KEY", "service/ids/counter"),
int(os.environ.get("CONSUL_MAX_RETRIES", 5)),
float(os.environ.get("CONSUL_RETRY_DELAY_SECONDS", 0.2)),
)
def generate_fallback_id() -> int:
"""
Generate a fallback ID when Consul is not available.
@@ -57,7 +52,8 @@ def generate_fallback_id() -> int:
logger.warning(f"Using fallback ID generation method: {unique_id}")
return unique_id
def get_unique_instance_id() -> int:
def get_unique_instance_id(config: AMQAdapter) -> int:
"""
Get a globally unique ID from Consul.
Uses Consul's atomic Compare-And-Set operations to safely increment a counter.
@@ -66,35 +62,33 @@ def get_unique_instance_id() -> int:
Returns:
int: A globally unique integer ID
"""
consul_host, consul_port, consul_counter_key, max_retries, retry_delay_seconds = get_config_values()
consul_host, consul_port, consul_counter_key, max_retries, retry_delay_seconds = (
get_config_values(config)
)
try:
c = consul.Consul(host=consul_host, port=consul_port)
index, data = c.kv.get(consul_counter_key)
c = consul_kv.Connection(endpoint=f"{consul_host}:{consul_port}", timeout=5)
index, data = c.get(consul_counter_key)
if data is None:
logger.info(f"Initializing Consul counter at {consul_counter_key}")
if c.kv.put(consul_counter_key, "1"):
if c.put(consul_counter_key, "1", cas=1):
return 1
else:
logger.error("Failed to initialize Consul counter")
return generate_fallback_id()
current_value = int(data['Value'].decode('utf-8'))
current_value = int(data["Value"].decode("utf-8"))
new_value = current_value + 1
for attempt in range(max_retries):
success = c.kv.put(
consul_counter_key,
str(new_value),
cas=data['ModifyIndex']
)
success = c.put(consul_counter_key, str(new_value), cas=data["ModifyIndex"])
if success:
logger.debug(f"Successfully obtained unique ID: {new_value}")
return new_value
logger.debug(f"CAS update failed on attempt {attempt + 1}, retrying...")
time.sleep(retry_delay_seconds)
index, data = c.kv.get(consul_counter_key)
time.sleep(retry_delay_seconds * (1 << attempt)) # Exponential backoff
index, data = c.get(consul_counter_key)
if data is None:
logger.error("Counter disappeared during update")
return generate_fallback_id()
current_value = int(data['Value'].decode('utf-8'))
current_value = int(data["Value"].decode("utf-8"))
new_value = current_value + 1
logger.error(f"Failed to update counter after {max_retries} attempts")
return generate_fallback_id()
amqp/config/amq_configuration.py
+40 -32
View File
@@ -24,9 +24,7 @@ class AMQAdapter:
:param config: config parser to read configuration values
"""
self.generator_id = config.getint(
"CleverMicro-AMQ", self.PREFIX + "generator-id", fallback=164
)
self.generator_id = 0
self.service_name = config.get(
"CleverMicro-AMQ",
self.PREFIX + "service-name",
@@ -50,49 +48,48 @@ class AMQAdapter:
self.swarm_task_id = os.getenv("SWARM_TASK_ID", default="python-adapter")
#
# Consul related configuration
self.consul_port = int(os.getenv(
self.consul_port = (
int(
os.getenv(
"CONSUL_PORT",
config.get(
"CleverMicro-AMQ",
self.PREFIX + "consul-port",
fallback="8500"
config.get("CleverMicro-AMQ", self.PREFIX + "consul-port", fallback="8500"),
)
)) if os.getenv("CONSUL_PORT") is not None else config.getint(
"CleverMicro-AMQ",
self.PREFIX + "consul-port",
fallback=8500
)
if os.getenv("CONSUL_PORT") is not None
else config.getint("CleverMicro-AMQ", self.PREFIX + "consul-port", fallback=8500)
)
self.consul_host = os.getenv(
"CONSUL_HOST",
config.get(
"CleverMicro-AMQ",
self.PREFIX + "consul-host",
fallback="consul"
config.get("CleverMicro-AMQ", self.PREFIX + "consul-host", fallback="consul"),
)
)
self.consul_max_retries = int(os.getenv(
self.consul_max_retries = (
int(
os.getenv(
"CONSUL_MAX_RETRIES",
config.get(
"CleverMicro-AMQ",
self.PREFIX + "consul-max-retries",
fallback="5"
config.get("CleverMicro-AMQ", self.PREFIX + "consul-max-retries", fallback="5"),
)
)) if os.getenv("CONSUL_MAX_RETRIES") is not None else config.getint(
"CleverMicro-AMQ",
self.PREFIX + "consul-max-retries",
fallback=5
)
self.consul_initial_retry_delay = float(os.getenv(
if os.getenv("CONSUL_MAX_RETRIES") is not None
else config.getint("CleverMicro-AMQ", self.PREFIX + "consul-max-retries", fallback=5)
)
self.consul_initial_retry_delay = (
float(
os.getenv(
"CONSUL_INITIAL_RETRY_DELAY",
config.get(
"CleverMicro-AMQ",
self.PREFIX + "consul-initial-retry-delay",
fallback="0.2"
fallback="0.2",
),
)
)) if os.getenv("CONSUL_INITIAL_RETRY_DELAY") is not None else config.getfloat(
"CleverMicro-AMQ",
self.PREFIX + "consul-initial-retry-delay",
fallback=0.2
)
if os.getenv("CONSUL_INITIAL_RETRY_DELAY") is not None
else config.getfloat(
"CleverMicro-AMQ", self.PREFIX + "consul-initial-retry-delay", fallback=0.2
)
)
self.consul_counter_key = config.get(
"CleverMicro-AMQ", self.PREFIX + "consul-counter-key", fallback="service/ids/counter"
)
def adapter_prefix(self) -> str:
@@ -218,3 +215,14 @@ class AMQConfiguration:
self.amq_adapter: AMQAdapter = AMQAdapter(config)
self.dispatch: Dispatch = Dispatch(config)
self.backpressure: Backpressure = Backpressure(config)
def get_unique_instance_id(self) -> int:
"""
Get a unique instance ID for this AMQ service.
Returns:
int: A unique instance ID
"""
if self.instance_id == -1:
logging_warning(f"Generated unique instance ID: {self.instance_id}")
return self.instance_id
amqp/config/application.properties
+8 -2
View File
@@ -14,8 +14,12 @@ cm.amq-adapter.generator-id=1
cm.amq-adapter.route-mapping=
# Indicate if AMQ Adapter should respond with HTTP 401 Unauthorized if the request does not contain valid JWT token
cm.amq-adapter.require-authenticated-user=false
# Indicate if AMQ Adapter should use inbuilt backpressure monitor (True) or rely only on the service backpressure updates (False)
cm.amq-adapter.default-backpressure-enabled=false
# Consul configuration for CleverMicro AMQ Adapter
cm.amq-adapter.consul-host=consul
cm.amq-adapter.consul-port=8500
cm.amq-adapter.consul-max-retries=5
cm.amq-adapter.consul-initial-retry-delay=0.2
cm.amq-adapter.consul-id-generator-key=services/ids/counter
# CleverMicro AMQ Adapter dispatcher, settings related to RabbitMQ connection and optional REST forwarding
cm.dispatch.use-dlq=true
@@ -42,3 +46,5 @@ cm.backpressure.time-window=10
cm.backpressure.cpu-overload-duration=30
# Define the time window length, in seconds, during which, if no request is made to the Service, the system will trigger IDLE alert
cm.backpressure.cpu-idle-duration=30
# AMQ Adapter can monitor CPU usage and trigger backpressure alerts based on CPU usage. Enable this feature explicitly
cm.backpressure.cpu-monitoring-enabled=false
amqp/service/amq_service.py
+16 -3
View File
@@ -10,6 +10,7 @@ from aio_pika.abc import AbstractRobustExchange
from amqp.adapter.amq_route_factory import AMQRouteFactory
from amqp.adapter.backpressure_handler import BackpressureHandler
from amqp.adapter.consul_global_id_generator import get_unique_instance_id
from amqp.adapter.data_message_factory import DataMessageFactory
from amqp.adapter.logging_utils import logging_info, logging_warning
from amqp.adapter.service_message_factory import ServiceMessageFactory
@@ -37,14 +38,17 @@ class AMQService:
def __init__(self, amq_configuration: AMQConfiguration, service_adapter=None):
logging.info("***********************************************")
logging.info("********** AMQ Service *******************")
logging.info("************** AMQ Service ***************")
logging.info("***********************************************")
self.loop = asyncio.new_event_loop()
self.amq_configuration = amq_configuration
self.service_adapter = service_adapter
self.unique_id = get_unique_instance_id(amq_configuration.amq_adapter)
amq_configuration.amq_adapter.generator_id = self.unique_id
self.data_message_factory = DataMessageFactory.get_instance(
self.amq_configuration.amq_adapter.generator_id
self.unique_id & DataMessageFactory.MACHINE_ID_MASK
)
self.router = RouterConsumer(self.amq_configuration)
self.rabbit_mq_client = RabbitMQClient(self.amq_configuration, self.router)
@@ -63,7 +67,7 @@ class AMQService:
# =======================================================================
# =======================================================================
# ====================== A P I M e t h o d s =========================
# ============== P u b l i c A P I M e t h o d s ===================
# =======================================================================
# =======================================================================
def run(self):
@@ -123,6 +127,15 @@ class AMQService:
)
return result
def get_unique_instance_id(self) -> int:
"""
Provides cluster-wide unique instance ID for this AMQ service instance.
This ID is used to identify the service instance in the cluster and is unique across all instances.
IDs are managed by shared Consul KV store, ensuring that even if multiple instances of the service are running,
they will each have unique ID.
"""
return self.unique_id
# =======================================================================
# ====================== Internal Methods ============================
# =======================================================================
amqp/service/consul_global_id_generator.py
-233
View File
@@ -1,233 +0,0 @@
import consul_kv
import socket
import os
import time
import logging
import threading
# --- Configuration ---
CONSUL_HOST = os.environ.get('CONSUL_HOST', 'localhost')
CONSUL_PORT = int(os.environ.get('CONSUL_PORT', 8500))
CONSUL_COUNTER_KEY = 'service/ids/counter'
MAX_RETRIES = 5 # Max attempts for atomic update
RETRY_DELAY_SECONDS = 0.1 # Delay between retries for atomic update
# --- Logging Setup ---
logging.basicConfig(level=logging.INFO, format='%(asctime)s - %(threadName)s - %(levelname)s - %(message)s')
logger = logging.getLogger(__name__)
# --- Fallback ID Generation ---
def generate_fallback_id() -> int:
"""
Generates a fallback ID based on hostname and PID if Consul is unavailable.
This provides a unique-ish ID for local testing/development but is not guaranteed
to be globally unique across different machines or after restarts.
"""
hostname = socket.gethostname()
pid = os.getpid()
# A simple way to combine them into a number.
# Hash hostname to an integer and combine with PID.
# Note: This is a simple fallback. For production, consider a more robust
# local ID generation or a different strategy if Consul is critical.
fallback_id = (hash(hostname) % 1000000) * 100000 + pid
logger.warning(
f"Consul is unavailable. Generating fallback ID: {fallback_id} (based on hostname: {hostname}, PID: {pid})")
return fallback_id
# --- Unique Instance ID Generation Function ---
def get_unique_instance_id() -> int:
"""
Reads and atomically increments a counter in Consul KV to get a unique instance ID.
If Consul is unavailable or the atomic update fails after retries,
it falls back to generating an ID based on hostname and PID.
"""
try:
# Initialize Consul client
client = consul_kv.Connection(endpoint=f"{CONSUL_HOST}:{CONSUL_PORT}")
logger.info(f"Attempting to connect to Consul at {CONSUL_HOST}:{CONSUL_PORT}")
for attempt in range(MAX_RETRIES):
try:
# 1. Read the current value and its modifyIndex (for CAS)
# client.get returns (value, modifyIndex)
current_value_str, modify_index = client.get(CONSUL_COUNTER_KEY)
# If key doesn't exist, initialize it to 0
if current_value_str is None:
current_value = 0
modify_index = 0 # For a non-existent key, modify_index is 0 for initial CAS
logger.info(f"Consul key '{CONSUL_COUNTER_KEY}' not found. Initializing to 0.")
else:
current_value = int(current_value_str)
new_value = current_value + 1
# 2. Attempt atomic update using CAS (Check-And-Set)
# client.set returns True on success, False on failure (if modify_index changed)
success = client.put(CONSUL_COUNTER_KEY, str(new_value), cas=modify_index)
if success:
logger.info(f"Successfully obtained unique ID: {new_value} (Attempt {attempt + 1}/{MAX_RETRIES})")
return new_value
else:
logger.warning(
f"CAS failed for '{CONSUL_COUNTER_KEY}' (modify_index changed). Retrying... (Attempt {attempt + 1}/{MAX_RETRIES})")
time.sleep(RETRY_DELAY_SECONDS * (attempt + 1)) # Exponential backoff for retries
except ValueError:
# Handle case where the stored value is not an integer
logger.error(
f"Value stored at '{CONSUL_COUNTER_KEY}' is not a valid integer. Please check Consul KV. Attempting to overwrite.")
# To recover, you might force a set without CAS, but that risks data loss.
# For this demo, we'll just let it retry or fall back.
time.sleep(RETRY_DELAY_SECONDS * (attempt + 1))
except Exception as e:
# Catch specific ConsulKV errors (e.g., connection issues, invalid response)
logger.error(f"ConsulKV error during atomic update (Attempt {attempt + 1}/{MAX_RETRIES}): {e}")
time.sleep(RETRY_DELAY_SECONDS * (attempt + 1)) # Exponential backoff
logger.error(f"Failed to obtain unique ID from Consul after {MAX_RETRIES} attempts.")
return generate_fallback_id() # Fallback if all retries fail
except Exception as e:
# Catch broader connection errors or unexpected issues with Consul client initialization
logger.error(f"Could not connect to Consul or an unexpected error occurred: {e}")
return generate_fallback_id() # Fallback if Consul is completely unreachable
import os
import logging
import random
import socket
import time
from typing import Optional
import consul
from amqp.config.amq_configuration import AMQConfiguration
from amqp.config.amq_configuration import AMQConfiguration
# Configuration from environment variables with defaults
CONSUL_HOST = os.environ.get('CONSUL_HOST', 'localhost')
CONSUL_PORT = int(os.environ.get('CONSUL_PORT', 8500))
CONSUL_COUNTER_KEY = 'service/ids/counter'
MAX_RETRIES = 5 # Max attempts for atomic update
RETRY_DELAY_SECONDS = 0.1 # Delay between retries for atomic update
logger = logging.getLogger(__name__)
def generate_fallback_id() -> int:
"""
Generate a fallback ID when Consul is not available.
Uses a combination of timestamp, hostname hash, and random number.
Returns:
int: A reasonably unique integer ID
"""
# Get current timestamp in milliseconds
timestamp = int(time.time() * 1000)
# Get hostname and hash it to an integer
hostname = socket.gethostname()
hostname_hash = hash(hostname) % 10000 # Limit to 4 digits
# Generate a random number
random_part = random.randint(0, 9999) # 4 digits
# Combine all parts into a single integer
# Format: TTTTTTTTTTT-HHHH-RRRR (T=timestamp, H=hostname hash, R=random)
unique_id = (timestamp * 100000000) + (hostname_hash * 10000) + random_part
logger.warning(f"Using fallback ID generation method: {unique_id}")
return unique_id
def get_unique_instance_id() -> int:
"""
Get a globally unique ID from Consul.
Uses Consul's atomic Compare-And-Set operations to safely increment a counter.
Falls back to a local generation method if Consul is unavailable.
Returns:
int: A globally unique integer ID
"""
consul_host, consul_port, consul_counter_key, max_retries, retry_delay_seconds = get_config_values()
try:
# Connect to Consul
c = consul.Consul(host=consul_host, port=consul_port)
# Try to get the current counter value
index, data = c.kv.get(CONSUL_COUNTER_KEY)
# If the key doesn't exist yet, create it with initial value
if data is None:
logger.info(f"Initializing Consul counter at {CONSUL_COUNTER_KEY}")
if c.kv.put(CONSUL_COUNTER_KEY, "1"):
return 1
else:
logger.error("Failed to initialize Consul counter")
return generate_fallback_id()
# Get the current value
current_value = int(data['Value'].decode('utf-8'))
new_value = current_value + 1
# Try to atomically update the counter
for attempt in range(MAX_RETRIES):
# Use Compare-And-Set to ensure atomicity
success = c.kv.put(
CONSUL_COUNTER_KEY,
str(new_value),
cas=data['ModifyIndex']
)
if success:
logger.debug(f"Successfully obtained unique ID: {new_value}")
return new_value
# If CAS failed, someone else updated the value, retry
logger.debug(f"CAS update failed on attempt {attempt+1}, retrying...")
time.sleep(RETRY_DELAY_SECONDS)
# Get the latest value for the next attempt
index, data = c.kv.get(CONSUL_COUNTER_KEY)
if data is None:
logger.error("Counter disappeared during update")
return generate_fallback_id()
current_value = int(data['Value'].decode('utf-8'))
new_value = current_value + 1
# If we've exhausted all retries, use the fallback
logger.error(f"Failed to update counter after {MAX_RETRIES} attempts")
return generate_fallback_id()
except Exception as e:
logger.error(f"Error accessing Consul: {str(e)}")
return generate_fallback_id()
def get_config_values():
"""
Get configuration values from AMQConfiguration or environment variables.
Returns:
tuple: (consul_host, consul_port, consul_counter_key, max_retries, retry_delay_seconds)
"""
try:
config = AMQConfiguration("application.properties")
consul_host = os.environ.get('CONSUL_HOST', 'localhost')
consul_port = int(os.environ.get('CONSUL_PORT', 8500))
consul_counter_key = os.environ.get('CONSUL_COUNTER_KEY', 'service/ids/counter')
max_retries = int(os.environ.get('CONSUL_MAX_RETRIES', 5))
retry_delay_seconds = float(os.environ.get('CONSUL_RETRY_DELAY_SECONDS', 0.1))
return consul_host, consul_port, consul_counter_key, max_retries, retry_delay_seconds
except Exception as e:
logger.warning(f"Failed to load configuration: {str(e)}. Using default values.")
return (
os.environ.get('CONSUL_HOST', 'localhost'),
int(os.environ.get('CONSUL_PORT', 8500)),
os.environ.get('CONSUL_COUNTER_KEY', 'service/ids/counter'),
int(os.environ.get('CONSUL_MAX_RETRIES', 5)),
float(os.environ.get('CONSUL_RETRY_DELAY_SECONDS', 0.1))
)
tests/adapter/perf_test_consul_global_id_generator.py
+3 -2
View File
@@ -2,7 +2,8 @@ import logging
import os
import threading
from amqp.service.consul_global_id_generator import get_unique_instance_id
from amqp.adapter.consul_global_id_generator import get_unique_instance_id
from amqp.config.amq_configuration import AMQConfiguration
CONSUL_HOST = os.environ.get("CONSUL_HOST", "localhost")
CONSUL_PORT = int(os.environ.get("CONSUL_PORT", 8500))
@@ -20,7 +21,7 @@ logger = logging.getLogger(__name__)
# --- Demo: Simulate Concurrent Access ---
def worker_thread(results_list):
"""A function to be run by multiple threads to get unique IDs."""
instance_id = get_unique_instance_id()
instance_id = get_unique_instance_id(AMQConfiguration("").amq_adapter)
results_list.append(instance_id)
logger.info(f"Thread {threading.current_thread().name} got ID: {instance_id}")
tests/adapter/test_backpressure_handler.py
+13 -5
View File
@@ -275,7 +275,9 @@ class TestBackpressureHandler:
"""
Pytest fixture to create a mock AMQConfiguration.
"""
return AMQConfiguration("")
amq_cfg = AMQConfiguration("")
amq_cfg.backpressure.cpu_monitoring_enabled = True
return amq_cfg
def test_backpressure_handler_initialization(self, mock_channel, mock_loop, mock_config):
"""
@@ -649,8 +651,12 @@ class TestBackpressureHandler:
mock_time.return_value = current_time
# Set last data message time to be older than idle_duration
handler.last_data_message_time = current_time - mock_config.backpressure.idle_duration - 10
handler.last_backpressure_event_time = current_time - mock_config.backpressure.time_window - 10
handler.last_data_message_time = (
current_time - mock_config.backpressure.idle_duration - 10
)
handler.last_backpressure_event_time = (
current_time - mock_config.backpressure.time_window - 10
)
# Call the method
await handler.check_overload_condition()
@@ -679,7 +685,9 @@ class TestBackpressureHandler:
mock_time.return_value = current_time
# Set last event time to be older than time_window
handler.last_backpressure_event_time = current_time - mock_config.backpressure.time_window - 10
handler.last_backpressure_event_time = (
current_time - mock_config.backpressure.time_window - 10
)
# Call the method
await handler.check_overload_condition()
@@ -701,7 +709,7 @@ class TestBackpressureHandler:
# Verify no thread was started
assert thread is None
assert not hasattr(handler, 'thread') or handler.thread is None
assert not hasattr(handler, "thread") or handler.thread is None
def test_start_backpressure_monitor_enabled(self, mock_channel, mock_loop, mock_config):
"""
tests/service/test_amq_service.py
-1
View File
@@ -10,7 +10,6 @@ class TestAMQService(unittest.IsolatedAsyncioTestCase):
def setUp(self):
# Create a mock configuration
self.mock_adapter = Mock(spec=AMQAdapter)
self.mock_adapter.generator_id = 12345
self.mock_adapter.service_name = "test-service"
self.mock_adapter.route_mapping = {}
self.mock_adapter.swarm_service_id = "test-swarm-id"