python: Documented meta data.

diff --git a/src/collectd-python.pod b/src/collectd-python.pod
index 8742104..05a411c 100644 (file)
--- a/src/collectd-python.pod
+++ b/src/collectd-python.pod
@@ -231,6 +231,28 @@ collectd you're done.
 The following complex types are used to pass values between the Python plugin
 and collectd:
 
+=head2 Signed
+
+The Signed class is just a long. It has all its methods and behaves exactly
+like any other long object. It is used to indicate if an integer was or should
+be stored as a signed or unsigned integer object.
+
+ class Signed(long)
+
+This is a long by another name. Use it in meta data dicts
+to choose the way it is stored in the meta data.
+
+=head2 Unsigned
+
+The Unsigned class is just a long. It has all its methods and behaves exactly
+like any other long object. It is used to indicate if an integer was or should
+be stored as a signed or unsigned integer object.
+
+ class Unsigned(long)
+
+This is a long by another name. Use it in meta data dicts
+to choose the way it is stored in the meta data.
+
 =head2 Config
 
 The Config class is an object which keeps the informations provided in the
@@ -394,6 +416,15 @@ If the sequence does not have the correct size upon dispatch a I<RuntimeError>
 exception will be raised. If the content of the sequence is not a number, a
 I<TypeError> exception will be raised.
 
+=item meta
+These are the meta data for this Value object.
+It has to be a dictionary of numbers, strings or bools. All keys must be
+strings. I<int> and <long> objects will be dispatched as signed integers unless
+they are between 2**63 and 2**64-1, which will result in a unsigned integer.
+You can force one of these storage classes by using the classes
+B<collectd.Signed> and B<collectd.Unsigned>. A meta object received by a write
+callback will always contain B<Signed> or B<Unsigned> objects.
+
 =back
 
 =head2 Notification

diff --git a/src/pyvalues.c b/src/pyvalues.c
index a928cbc..890dc4e 100644 (file)
--- a/src/pyvalues.c
+++ b/src/pyvalues.c
@@ -309,8 +309,12 @@ static char values_doc[] = "These are the actual values that get dispatched to c
                "a TypeError exception will be raised.";
 
 static char meta_doc[] = "These are the meta data for this Value object.\n"
-               "It has to be a dictionary of numbers, strings or bools.\n"
-               "If the dict contains anything else a TypeError exception will be raised.";
+               "It has to be a dictionary of numbers, strings or bools. All keys must be\n"
+               "strings. int and long objects will be dispatched as signed integers unless\n"
+               "they are between 2**63 and 2**64-1, which will result in a unsigned integer.\n"
+               "You can force one of these storage classes by using the classes\n"
+               "collectd.Signed and collectd.Unsigned. A meta object received by a write\n"
+               "callback will always contain Signed or Unsigned objects.";
 
 static char dispatch_doc[] = "dispatch([type][, values][, plugin_instance][, type_instance]"
                "[, plugin][, host][, time][, interval]) -> None.  Dispatch a value list.\n"
@@ -340,6 +344,7 @@ static PyObject *Values_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
                return NULL;
        
        self->values = PyList_New(0);
+       self->meta = PyDict_New();
        self->interval = 0;
        return (PyObject *) self;
 }
@@ -386,9 +391,12 @@ static int Values_init(PyObject *s, PyObject *args, PyObject *kwds) {
        
        tmp = self->values;
        self->values = values;
-       self->meta = meta;
        Py_XDECREF(tmp);
        
+       tmp = self->meta;
+       self->meta = meta;
+       Py_XDECREF(tmp);
+
        self->interval = interval;
        return 0;
 }
@@ -1001,6 +1009,9 @@ PyTypeObject NotificationType = {
        Notification_new           /* tp_new */
 };
 
+static const char Signed_doc[] = "This is a long by another name. Use it in meta data dicts\n"
+               "to choose the way it is stored in the meta data.";
+
 PyTypeObject SignedType = {
        CPY_INIT_TYPE
        "collectd.Signed",         /* tp_name */
@@ -1022,8 +1033,12 @@ PyTypeObject SignedType = {
        0,                         /* tp_setattro */
        0,                         /* tp_as_buffer */
        Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /*tp_flags*/
+       Signed_doc                 /* tp_doc */
 };
 
+static const char Unsigned_doc[] = "This is a long by another name. Use it in meta data dicts\n"
+               "to choose the way it is stored in the meta data.";
+
 PyTypeObject UnsignedType = {
        CPY_INIT_TYPE
        "collectd.Unsigned",       /* tp_name */
@@ -1045,4 +1060,5 @@ PyTypeObject UnsignedType = {
        0,                         /* tp_setattro */
        0,                         /* tp_as_buffer */
        Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /*tp_flags*/
+       Unsigned_doc               /* tp_doc */
 };