utils: disallow empty strings as series names

iobeam/resources/data.py

@@ -56,7 +56,7 @@ def asMilliseconds(self):
         elif self._type == TimeUnit.MILLISECONDS:
             return self._value
         elif self._type == TimeUnit.SECONDS:
-            return (self._value * 1000)
+            return self._value * 1000
 
     def asMicroseconds(self):
         """This timestamp value represented in microseconds.
@@ -137,8 +137,6 @@ def toDict(self):
 class DataStore(object):
     """A collection of data streams with rows batched by time."""
 
-    _RESERVED_NAMES = ["time", "time_offset", "all"]
-
     def __init__(self, columns):
         """Construct a new DataStore object with given columns.
 
@@ -153,9 +151,8 @@ def __init__(self, columns):
             raise ValueError("columns cannot be None or empty")
         if not isinstance(columns, list):
             raise ValueError("columns must be a list of strings")
-        for name in DataStore._RESERVED_NAMES:
-            if name in [c.lower() for c in columns]:
-                raise ValueError("'{}' is a reserved column name".format(name))
+        for c in columns:
+            utils.checkValidSeriesName(c)
 
         self._columns = list(columns)  # defensive copy
         self._rows = []

iobeam/utils/utils.py

@@ -67,6 +67,22 @@ def __checkNon0LengthString(value, valueName):
     elif len(value) == 0:
         raise ValueError("{} must be more than 0 characters".format(valueName))
 
+__RESERVED_COL_NAMES = ["time", "time_offset", "all"]
+
+def checkValidSeriesName(name):
+    """Check that a series name is valid.
+
+    A valid series name is not reserved by iobeam (time, time_offset, all) and
+    a non-0 length string.
+
+    Raises:
+        ValueError - If `name` is (a) None, (b) not a string/unicode, (c)
+                     is of length 0, or (d) reserved.
+    """
+    __checkNon0LengthString(name, "columns")
+    if name.lower() in __RESERVED_COL_NAMES:
+        raise ValueError("'{}' is a reserved column name".format(name))
+
 def checkValidDeviceId(deviceId):
     """Check that a deviceId is valid: string of len > 0
 
@@ -92,6 +108,8 @@ def checkValidProjectToken(token):
 __LOGGER = None
 
 def getLogger():
+    """Get the logger for this library."""
+
     global __LOGGER
     if __LOGGER is not None:
         logger = __LOGGER

pylintrc

@@ -139,7 +139,7 @@ required-attributes=
 bad-functions=map,filter,input
 
 # Good variable names which should always be accepted, separated by a comma
-good-names=i,j,k,ex,Run,_,r,p,d,f,pt
+good-names=i,j,k,ex,Run,_,r,p,d,f,pt,ts,c
 
 # Bad variable names which should always be refused, separated by a comma
 bad-names=foo,bar,baz,toto,tutu,tata

tests/resources/test_data.py

@@ -154,7 +154,8 @@ def verify(fields):
             ["time_offset", "col"],
             ["col", "TIME_OFfset"],
             ["all"],
-            ["AlL"]
+            ["AlL"],
+            ["fine", ""]
         ]
         for c in cases:
             verify(c)