code to call recorder functions from frointend

backend/recorder_adapters/helpers.py

@@ -0,0 +1,61 @@
+import logging
+from typing import Union
+
+from backend.models import Recorder, RecorderCommand, LrcException
+from backend.recorder_adapters import get_recorder_adapter_by_id
+
+logger = logging.getLogger("lrc.recorder_adapters.helpers")
+
+
+def validate_recorder_command_params(recorder_command: RecorderCommand, params: dict, fail_on_missing_params=False):
+    if recorder_command.parameters is None or len(recorder_command.parameters) == 0:
+        if len(params) == 0:
+            logger.debug("Number (0) of parameters matching expected number of args of command signature.")
+            return True
+        logger.info("More arguments specified ({}) than expected!".format(len(params)))
+        return False
+    for p_n in recorder_command.parameters:
+        p_t = recorder_command.parameters[p_n]
+        p = params.get(p_n, None)
+        if p is None:
+            if fail_on_missing_params:
+                return False
+        else:
+            if p_t == 'int':
+                params[p_n] = int(p)
+    return True
+
+
+def get_function_from_recorder_command(recorder: Recorder, recorder_command: RecorderCommand,
+                                       connect_by_network_name=True):
+    adapter_name, function_name = recorder_command.name.split(':')
+    if connect_by_network_name and recorder.network_name is not None:
+        address = recorder.network_name
+    elif recorder.ip6 is not None:
+        address = recorder.ip6
+    else:
+        address = recorder.ip
+    logger.debug("Using {} to create recorder adapter to connect to {}.".format(address, recorder.name))
+    package_name, class_name = adapter_name.split('.')
+    adapter = get_recorder_adapter_by_id(class_name, address=address, user=recorder.username,
+                                         password=recorder.password, firmware_version=recorder.firmware_version)
+    logger.debug("Built adapter {}".format(adapter))
+    return getattr(adapter, function_name)
+
+
+def execute_recorder_command(recorder: Recorder, recorder_command: RecorderCommand, params: Union[dict, None] = None,
+                             connect_by_network_name=True):
+    if params is None:
+        params = dict()
+    if validate_recorder_command_params(recorder_command, params):
+        try:
+            func = get_function_from_recorder_command(recorder, recorder_command, connect_by_network_name)
+            logger.debug(
+                "Executing func: {} with params: '{}'".format(func, ", ".join(": ".join(str(_)) for _ in params.items())))
+            out = func(**params)
+            return True, out
+        except LrcException as e:
+            return False, str(e)
+    else:
+        logger.info("Could not validate given parameters!")
+        return False