Improve logging for pedalboard screenshots

Signed-off-by: falkTX <falktx@falktx.com>

mod/screenshot.py

@@ -5,6 +5,7 @@
 import os
 import subprocess
 import sys
+import logging
 
 from tornado.ioloop import IOLoop
 from mod.settings import HTML_DIR, DEV_ENVIRONMENT, DEVICE_KEY, CACHE_DIR
@@ -27,7 +28,7 @@ def generate_screenshot(bundle_path, callback):
         cmd = [os.path.join(cwd, 'mod-pedalboard'), 'take_screenshot', bundle_path, HTML_DIR, CACHE_DIR]
         if sys.platform == 'win32':
             cmd[0] += ".exe"
-        print(' '.join(cmd))
+        logging.debug('[screenshot] now running: %s', ' '.join(cmd))
 
     # regular run
     else:
@@ -44,6 +45,7 @@ def proc_callback():
             return
 
         if not os.path.exists(screenshot) or not os.path.exists(thumbnail):
+            logging.warn('[screenshot] process finished but image files do not exist')
             callback()
             return
 
@@ -94,7 +96,7 @@ def img_callback(thumbnail=None):
         try:
             generate_screenshot(self.processing, img_callback)
         except Exception as ex:
-            print('ERROR: {0}'.format(ex))
+            logging.error('[screenshot] %s', ex)
             img_callback()
 
     def check_screenshot(self, bundlepath):