Add configurable throttle mechanism

freqtrade/misc.py

@@ -1,11 +1,15 @@
 import argparse
 import enum
 import logging
+from typing import Any, Callable
 
+import time
 from wrapt import synchronized
 
 from freqtrade import __version__
 
+logger = logging.getLogger(__name__)
+
 
 class State(enum.Enum):
     RUNNING = 0
@@ -36,6 +40,23 @@ def get_state() -> State:
     return _STATE
 
 
+def throttle(func: Callable[..., Any], min_secs: float, *args, **kwargs) -> Any:
+    """
+    Throttles the given callable that it
+    takes at least `min_secs` to finish execution.
+    :param func: Any callable
+    :param min_secs: minimum execution time in seconds
+    :return: Any
+    """
+    start = time.time()
+    result = func(*args, **kwargs)
+    end = time.time()
+    duration = max(min_secs - (end - start), 0.0)
+    logger.debug('Throttling %s for %.2f seconds', func.__name__, duration)
+    time.sleep(duration)
+    return result
+
+
 def build_arg_parser() -> argparse.ArgumentParser:
     """ Builds and returns an ArgumentParser instance """
     parser = argparse.ArgumentParser(
@@ -104,6 +125,12 @@ CONF_SCHEMA = {
             'required': ['enabled', 'token', 'chat_id']
         },
         'initial_state': {'type': 'string', 'enum': ['running', 'stopped']},
+        'internals': {
+            'type': 'object',
+            'properties': {
+                'process_throttle_secs': {'type': 'number'}
+            }
+        }
     },
     'definitions': {
         'exchange': {