113 lines
3.5 KiB
Diff
113 lines
3.5 KiB
Diff
From 52ee1dab95436128b44c37cc495022ff90108b2e Mon Sep 17 00:00:00 2001
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From: Nikolaus Rath <Nikolaus@rath.org>
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Date: Mon, 9 May 2022 10:04:30 +0100
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Subject: [PATCH] Add nbdkit.parse_size() Python function.
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This enables Python plugins to parse sizes the same way as C plugins.
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I'm not sure about the best way to test this - input is appreciated.
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I'm not too happy with the way this code is tested. It workes, but putting the tests into
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test-python-plugin.py feels misplaced: this file is intended to support the unit tests in
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test_python.py, not run its own unit tests.
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(cherry picked from commit 1b7d72542be68e254c1ef86ecb1a82b05c78ff63)
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---
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plugins/python/modfunctions.c | 21 +++++++++++++++++++++
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plugins/python/nbdkit-python-plugin.pod | 5 +++++
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tests/test-python-plugin.py | 19 +++++++++++++++++++
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3 files changed, 45 insertions(+)
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diff --git a/plugins/python/modfunctions.c b/plugins/python/modfunctions.c
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index fffbaab2..46b0c904 100644
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--- a/plugins/python/modfunctions.c
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+++ b/plugins/python/modfunctions.c
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@@ -93,11 +93,32 @@ do_shutdown (PyObject *self, PyObject *args)
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Py_RETURN_NONE;
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}
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+/* nbdkit.parse_size */
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+static PyObject *
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+parse_size (PyObject *self, PyObject *args)
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+{
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+ const char *s;
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+ if (!PyArg_ParseTuple (args, "s", &s)) {
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+ PyErr_SetString (PyExc_TypeError, "Expected string, got something else");
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+ return NULL;
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+ }
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+
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+ int64_t size = nbdkit_parse_size(s);
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+ if (size == -1) {
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+ PyErr_SetString (PyExc_ValueError, "Unable to parse string as size");
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+ return NULL;
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+ }
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+
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+ return PyLong_FromSize_t((size_t)size);
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+}
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+
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static PyMethodDef NbdkitMethods[] = {
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{ "debug", debug, METH_VARARGS,
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"Print a debug message" },
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{ "export_name", export_name, METH_VARARGS,
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"Return the optional export name negotiated with the client" },
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+ { "parse_size", parse_size, METH_VARARGS,
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+ "Parse human-readable size strings into bytes" },
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{ "set_error", set_error, METH_VARARGS,
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"Store an errno value prior to throwing an exception" },
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{ "shutdown", do_shutdown, METH_VARARGS,
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diff --git a/plugins/python/nbdkit-python-plugin.pod b/plugins/python/nbdkit-python-plugin.pod
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index 051b0237..ccc9406f 100644
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--- a/plugins/python/nbdkit-python-plugin.pod
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+++ b/plugins/python/nbdkit-python-plugin.pod
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@@ -131,6 +131,11 @@ Record C<err> as the reason you are about to throw an exception. C<err>
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should correspond to usual errno values, where it may help to
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C<import errno>.
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+=head3 C<nbdkit.parse_size(str)>
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+
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+Parse a string (such as "100M") into a size in bytes. Wraps the
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+C<nbdkit_parse_size()> C function.
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+
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=head3 C<nbdkit.shutdown()>
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Request asynchronous server shutdown.
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diff --git a/tests/test-python-plugin.py b/tests/test-python-plugin.py
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index 0b34d532..d4f379fc 100644
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--- a/tests/test-python-plugin.py
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+++ b/tests/test-python-plugin.py
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@@ -34,12 +34,31 @@
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import nbdkit
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import pickle
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import base64
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+import unittest
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API_VERSION = 2
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cfg = {}
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+# Not nice, but there doesn't seem to be a better way of putting this
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+class TestAPI(unittest.TestCase):
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+
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+ def test_parse_size(self):
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+ self.assertEqual(nbdkit.parse_size('511'), 511)
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+ self.assertEqual(nbdkit.parse_size('7k'), 7*1024)
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+ self.assertEqual(nbdkit.parse_size('17M'), 17*1024*1024)
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+
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+ with self.assertRaises(TypeError):
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+ nbdkit.parse_size(17)
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+
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+ with self.assertRaises(ValueError):
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+ nbdkit.parse_size('foo')
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+
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+
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+TestAPI().test_parse_size()
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+
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+
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def config(k, v):
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global cfg
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if k == "cfg":
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--
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2.31.1
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