feat(core): Add execution flow to native Python runner (no-changelog) (#18485)

packages/@n8n/task-runner-python/src/constants.py

@@ -1,26 +1,48 @@
-# Message Types
+# Messages
 BROKER_INFO_REQUEST = "broker:inforequest"
 BROKER_RUNNER_REGISTERED = "broker:runnerregistered"
 BROKER_TASK_OFFER_ACCEPT = "broker:taskofferaccept"
-
+BROKER_TASK_SETTINGS = "broker:tasksettings"
+BROKER_TASK_CANCEL = "broker:taskcancel"
 RUNNER_INFO = "runner:info"
 RUNNER_TASK_OFFER = "runner:taskoffer"
 RUNNER_TASK_ACCEPTED = "runner:taskaccepted"
 RUNNER_TASK_REJECTED = "runner:taskrejected"
+RUNNER_TASK_DONE = "runner:taskdone"
+RUNNER_TASK_ERROR = "runner:taskerror"
 
-# Task Runner Defaults
+# Runner
 TASK_TYPE_PYTHON = "python"
-DEFAULT_MAX_CONCURRENCY = 5
+RUNNER_NAME = "Python Task Runner"
+DEFAULT_MAX_CONCURRENCY = 5  # tasks
 DEFAULT_MAX_PAYLOAD_SIZE = 1024 * 1024 * 1024  # 1 GiB
+DEFAULT_TASK_TIMEOUT = 60  # seconds
 OFFER_INTERVAL = 0.25  # 250ms
 OFFER_VALIDITY = 5000  # ms
 OFFER_VALIDITY_MAX_JITTER = 500  # ms
 OFFER_VALIDITY_LATENCY_BUFFER = 0.1  # 100ms
-DEFAULT_TASK_BROKER_URI = "http://127.0.0.1:5679"
 
-# Environment Variables
+# Executor
+EXECUTOR_USER_OUTPUT_KEY = "__n8n_internal_user_output__"
+
+# Broker
+DEFAULT_TASK_BROKER_URI = "http://127.0.0.1:5679"
+TASK_BROKER_WS_PATH = "/runners/_ws"
+
+# Env vars
 ENV_TASK_BROKER_URI = "N8N_RUNNERS_TASK_BROKER_URI"
 ENV_GRANT_TOKEN = "N8N_RUNNERS_GRANT_TOKEN"
+ENV_MAX_CONCURRENCY = "N8N_RUNNERS_MAX_CONCURRENCY"
+ENV_MAX_PAYLOAD_SIZE = "N8N_RUNNERS_MAX_PAYLOAD"
+ENV_TASK_TIMEOUT = "N8N_RUNNERS_TASK_TIMEOUT"
+ENV_HIDE_TASK_OFFER_LOGS = "N8N_RUNNERS_HIDE_TASK_OFFER_LOGS"
 
-# WebSocket Paths
-WS_RUNNERS_PATH = "/runners/_ws"
+# Logging
+LOG_FORMAT = "%(asctime)s.%(msecs)03d\t%(levelname)s\t%(message)s"
+LOG_TIMESTAMP_FORMAT = "%Y-%m-%d %H:%M:%S"
+
+# Rejection reasons
+TASK_REJECTED_REASON_OFFER_EXPIRED = (
+    "Offer expired - not accepted within validity window"
+)
+TASK_REJECTED_REASON_AT_CAPACITY = "No open task slots - runner already at capacity"