Minor airtime_analyzer error handling improvements and documentation

python_apps/airtime_analyzer/airtime_analyzer/message_listener.py

@@ -233,7 +233,7 @@ class MessageListener:
             AnalyzerPipeline.run_analysis(q, audio_file_path, import_directory, original_filename, storage_backend, file_prefix, cloud_storage_config)
             results = q.get()
         except Exception as e:
-            logging.error("Analyzer pipeline exception", e)
+            logging.error("Analyzer pipeline exception: %s" % str(e))
             pass
 
         # Ensure our queue doesn't fill up and block due to unexpected behaviour. Defensive code.

python_apps/airtime_analyzer/airtime_analyzer/playability_analyzer.py

@@ -27,6 +27,6 @@ class PlayabilityAnalyzer(Analyzer):
             logging.warn("Failed to run: %s - %s. %s" % (command[0], e.strerror, "Do you have liquidsoap installed?"))
         except (subprocess.CalledProcessError, Exception) as e: # liquidsoap returned an error code
             logging.warn(e)
-            raise UnplayableFileError
+            raise UnplayableFileError()
 
         return metadata

python_apps/airtime_analyzer/airtime_analyzer/status_reporter.py

@@ -25,7 +25,7 @@ class PicklableHttpRequest:
                                 auth=requests.auth.HTTPBasicAuth(self.api_key, ''))
 
 def process_http_requests(ipc_queue, http_retry_queue_path):
-    ''' Runs in a separate process and performs all the HTTP requests where we're
+    ''' Runs in a separate thread and performs all the HTTP requests where we're
         reporting extracted audio file metadata or errors back to the Airtime web application.
 
         This process also checks every 5 seconds if there's failed HTTP requests that we