From 1525e85805e22f3434b7f9e9e87e15c1e8acbac0 Mon Sep 17 00:00:00 2001
From: Robert Baldyga <robert.baldyga@intel.com>
Date: Thu, 3 Oct 2019 14:43:21 +0200
Subject: [PATCH] Add global random seed config

This is needed to make fuzzy tests work with xdist as each
xdist gateway expects to receive the same set of parameter
values, which for random generators may be achieved only by
providing globally shared seed.

Signed-off-by: Robert Baldyga <robert.baldyga@intel.com>
---
 tests/functional/Makefile                  |  7 +++++--
 tests/functional/config/random.cfg         |  2 ++
 tests/functional/tests/utils/random.py     |  8 ++++++--
 tests/functional/utils/configure_random.py | 13 +++++++++++++
 4 files changed, 26 insertions(+), 4 deletions(-)
 create mode 100644 tests/functional/config/random.cfg
 create mode 100755 tests/functional/utils/configure_random.py

diff --git a/tests/functional/Makefile b/tests/functional/Makefile
index b8963b2..71a77dc 100755
--- a/tests/functional/Makefile
+++ b/tests/functional/Makefile
@@ -18,7 +18,7 @@ SRC=$(shell find $(SRCDIR) $(WRAPDIR) -name \*.c)
 OBJS=$(patsubst %.c, %.o, $(SRC))
 OCFLIB=$(ADAPTERDIR)/libocf.so
 
-all: | sync
+all: | sync config_random
 	$(MAKE) $(OCFLIB)
 
 $(OCFLIB): $(OBJS)
@@ -36,6 +36,9 @@ sync:
 	@$(MAKE) -C $(OCFDIR) src O=$(ADAPTERDIR)/ocf
 	@$(MAKE) -C $(OCFDIR) env O=$(ADAPTERDIR)/ocf OCF_ENV=posix
 
+config_random:
+	@python3 utils/configure_random.py
+
 clean:
 	@rm -rf $(OCFLIB) $(OBJS)
 	@echo "  CLEAN "
@@ -46,4 +49,4 @@ distclean: clean
 	@rm -rf $(INCDIR)/ocf
 	@echo "  DISTCLEAN "
 
-.PHONY: all clean sync distclean
+.PHONY: all clean sync config_random distclean
diff --git a/tests/functional/config/random.cfg b/tests/functional/config/random.cfg
new file mode 100644
index 0000000..f7ab212
--- /dev/null
+++ b/tests/functional/config/random.cfg
@@ -0,0 +1,2 @@
+# This file content will be generated by utils/configure_random.py
+# triggered from the Makefile
diff --git a/tests/functional/tests/utils/random.py b/tests/functional/tests/utils/random.py
index 924e018..2773570 100644
--- a/tests/functional/tests/utils/random.py
+++ b/tests/functional/tests/utils/random.py
@@ -36,6 +36,8 @@ class DefaultRanges(Range, enum.Enum):
 
 class RandomGenerator:
     def __init__(self, base_range=DefaultRanges.INT, count=1000):
+        with open("config/random.cfg") as f:
+            self.random = random.Random(int(f.read()))
         self.exclude = []
         self.range = base_range
         self.count = count
@@ -53,7 +55,7 @@ class RandomGenerator:
             raise StopIteration()
         self.n += 1
         while True:
-            val = random.randint(self.range.min, self.range.max)
+            val = self.random.randint(self.range.min, self.range.max)
             if self.exclude:
                 excl_map = map(lambda e: e.is_within(val), self.exclude)
                 is_excluded = reduce(lambda a, b: a or b, excl_map)
@@ -64,6 +66,8 @@ class RandomGenerator:
 
 class RandomStringGenerator:
     def __init__(self, len_range=Range(0, 20), count=700):
+        with open("config/random.cfg") as f:
+            self.random = random.Random(int(f.read()))
         self.generator = self.__string_generator(len_range)
         self.count = count
         self.n = 0
@@ -78,7 +82,7 @@ class RandomStringGenerator:
                       string.punctuation,
                       string.hexdigits]:
                 yield ''.join(random.choice(t) for _ in range(
-                    random.randint(len_range.min, len_range.max)
+                    self.random.randint(len_range.min, len_range.max)
                 ))
 
     def __iter__(self):
diff --git a/tests/functional/utils/configure_random.py b/tests/functional/utils/configure_random.py
new file mode 100755
index 0000000..71a0440
--- /dev/null
+++ b/tests/functional/utils/configure_random.py
@@ -0,0 +1,13 @@
+#!/usr/bin/env python3
+
+#
+# Copyright(c) 2012-2018 Intel Corporation
+# SPDX-License-Identifier: BSD-3-Clause-Clear
+#
+
+import sys
+import random
+
+
+with open("config/random.cfg", "w") as f:
+    f.write(str(random.randint(0, sys.maxsize)))