pyDKB/common: move read_es_config() function from stage to library.

Function like this seem to be needed in multiple places, so why not to
have it in the common library.

Utils/Dataflow/091_datasetsRucio/datasets_processing.py

@@ -37,6 +37,7 @@
     sys.path.append(dkb_dir)
     import pyDKB
     from pyDKB import storages
+    from pyDKB.common.utils import read_es_config
 except Exception, err:
     sys.stderr.write("(ERROR) Failed to import pyDKB library: %s\n" % err)
     sys.exit(1)
@@ -103,34 +104,6 @@ def main(argv):
     sys.exit(exit_code)
 
 
-def read_es_config(cfg_file):
-    """ Read ES configuration file.
-
-    :param cfg_file: open file descriptor with ES access configuration
-    :type cfg_file: file descriptor
-    """
-    keys = {'ES_HOST': 'host',
-            'ES_PORT': 'port',
-            'ES_USER': 'user',
-            'ES_PASSWORD': '__passwd',
-            'ES_INDEX': 'index'
-            }
-    cfg = {}
-    for line in cfg_file.readlines():
-        if line.strip().startswith('#'):
-            continue
-        line = line.split('#')[0].strip()
-        if '=' not in line:
-            continue
-        key, val = line.split('=')[:2]
-        try:
-            cfg[keys[key]] = val
-        except KeyError:
-            sys.stderr.write("(WARN) Unknown configuration parameter: "
-                             "'%s'.\n" % key)
-    return cfg
-
-
 def init_rucio_client():
     """ Initialize global variable `rucio_client`. """
     global rucio_client

Utils/Dataflow/pyDKB/common/utils.py

@@ -54,3 +54,34 @@ def custom_readline(f, newline):
             pos = buf.index(newline)
             yield buf[:pos]
             buf = buf[pos + len(newline):]
+
+
+def read_es_config(cfg_file):
+    """ Read ES configuration file.
+
+    We have ES config in form of file with shell variables declaration,
+    but sometimes need to parse it in Python as well.
+
+    :param cfg_file: open file descriptor with ES access configuration
+    :type cfg_file: file descriptor
+    """
+    keys = {'ES_HOST': 'host',
+            'ES_PORT': 'port',
+            'ES_USER': 'user',
+            'ES_PASSWORD': '__passwd',
+            'ES_INDEX': 'index'
+            }
+    cfg = {}
+    for line in cfg_file.readlines():
+        if line.strip().startswith('#'):
+            continue
+        line = line.split('#')[0].strip()
+        if '=' not in line:
+            continue
+        key, val = line.split('=')[:2]
+        try:
+            cfg[keys[key]] = val
+        except KeyError:
+            sys.stderr.write("(WARN) Unknown configuration parameter: "
+                             "'%s'.\n" % key)
+    return cfg