[PATCH v10 04/18] kunit: test: add kunit_stream a std::stream like logger

[Brendan Higgins <brendanhiggins-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>]

A lot of the expectation and assertion infrastructure prints out fairly
complicated test failure messages, so add a C++ style log library for
for logging test results called `struct kunit_stream`.

kunit_stream allows us to construct a message before we know whether we
want to print it out; this can be extremely handy if there is
information you might need for a failure message that is easiest to
collect in the steps leading up to the actual check.

Signed-off-by: Brendan Higgins <brendanhiggins-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
Reviewed-by: Greg Kroah-Hartman <gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org>
Reviewed-by: Logan Gunthorpe <logang-OTvnGxWRz7hWk0Htik3J/w@public.gmane.org>
---
 include/kunit/kunit-stream.h |  81 ++++++++++++++++++++++++
 include/kunit/test.h         |   3 +
 kunit/Makefile               |   3 +-
 kunit/kunit-stream.c         | 116 +++++++++++++++++++++++++++++++++++
 kunit/test.c                 |   6 ++
 5 files changed, 208 insertions(+), 1 deletion(-)
 create mode 100644 include/kunit/kunit-stream.h
 create mode 100644 kunit/kunit-stream.c

diff --git a/include/kunit/kunit-stream.h b/include/kunit/kunit-stream.h
new file mode 100644
index 0000000000000..a7b53eabf6be4
--- /dev/null
+++ b/include/kunit/kunit-stream.h
@@ -0,0 +1,81 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * C++ stream style string formatter and printer used in KUnit for outputting
+ * KUnit messages.
+ *
+ * Copyright (C) 2019, Google LLC.
+ * Author: Brendan Higgins <brendanhiggins-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
+ */
+
+#ifndef _KUNIT_KUNIT_STREAM_H
+#define _KUNIT_KUNIT_STREAM_H
+
+#include <linux/types.h>
+#include <kunit/string-stream.h>
+
+struct kunit;
+
+/**
+ * struct kunit_stream - a std::stream style string builder.
+ *
+ * A std::stream style string builder. Allows messages to be built up and
+ * printed all at once.
+ */
+struct kunit_stream {
+	/* private: internal use only. */
+	struct kunit *test;
+	const char *level;
+	struct string_stream *internal_stream;
+};
+
+/**
+ * alloc_kunit_stream() - constructs a new &struct kunit_stream.
+ * @test: The test context object.
+ * @level: The log level at which to print out the message.
+ *
+ * Constructs a new test managed &struct kunit_stream.
+ */
+struct kunit_stream *alloc_kunit_stream(struct kunit *test, const char *level);
+
+/**
+ * kunit_stream_add(): adds the formatted input to the internal buffer.
+ * @kstream: the stream being operated on.
+ * @fmt: printf style format string to append to stream.
+ *
+ * Appends the formatted string, @fmt, to the internal buffer.
+ */
+void __printf(2, 3) kunit_stream_add(struct kunit_stream *kstream,
+				     const char *fmt, ...);
+
+/**
+ * kunit_stream_append(): appends the contents of @other to @kstream.
+ * @kstream: the stream to which @other is appended.
+ * @other: the stream whose contents are appended to @kstream.
+ *
+ * Appends the contents of @other to @kstream.
+ */
+void kunit_stream_append(struct kunit_stream *kstream,
+			 struct kunit_stream *other);
+
+/**
+ * kunit_stream_commit(): prints out the internal buffer to the user.
+ * @kstream: the stream being operated on.
+ *
+ * Outputs the contents of the internal buffer as a kunit_printk formatted
+ * output. KUNIT_STREAM ONLY OUTPUTS ITS BUFFER TO THE USER IF COMMIT IS
+ * CALLED!!! The reason for this is that it allows us to construct a message
+ * before we know whether we want to print it out; this can be extremely handy
+ * if there is information you might need for a failure message that is easiest
+ * to collect in the steps leading up to the actual check.
+ */
+void kunit_stream_commit(struct kunit_stream *kstream);
+
+/**
+ * kunit_stream_clear(): clears the internal buffer.
+ * @kstream: the stream being operated on.
+ *
+ * Clears the contents of the internal buffer.
+ */
+void kunit_stream_clear(struct kunit_stream *kstream);
+
+#endif /* _KUNIT_KUNIT_STREAM_H */
diff --git a/include/kunit/test.h b/include/kunit/test.h
index 12196719cf8f4..e92940d7e9e50 100644
--- a/include/kunit/test.h
+++ b/include/kunit/test.h
@@ -11,6 +11,7 @@
 
 #include <linux/types.h>
 #include <linux/slab.h>
+#include <kunit/kunit-stream.h>
 
 struct kunit_resource;
 
@@ -184,6 +185,8 @@ struct kunit {
 
 void kunit_init_test(struct kunit *test, const char *name);
 
+void kunit_fail(struct kunit *test, struct kunit_stream *stream);
+
 int kunit_run_tests(struct kunit_suite *suite);
 
 /**
diff --git a/kunit/Makefile b/kunit/Makefile
index 275b565a0e81f..6ddc622ee6b1c 100644
--- a/kunit/Makefile
+++ b/kunit/Makefile
@@ -1,2 +1,3 @@
 obj-$(CONFIG_KUNIT) +=			test.o \
-					string-stream.o
+					string-stream.o \
+					kunit-stream.o
diff --git a/kunit/kunit-stream.c b/kunit/kunit-stream.c
new file mode 100644
index 0000000000000..c87b7fd3c06b4
--- /dev/null
+++ b/kunit/kunit-stream.c
@@ -0,0 +1,116 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * C++ stream style string formatter and printer used in KUnit for outputting
+ * KUnit messages.
+ *
+ * Copyright (C) 2019, Google LLC.
+ * Author: Brendan Higgins <brendanhiggins-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
+ */
+
+#include <kunit/test.h>
+#include <kunit/kunit-stream.h>
+#include <kunit/string-stream.h>
+
+void kunit_stream_add(struct kunit_stream *kstream, const char *fmt, ...)
+{
+	va_list args;
+	struct string_stream *stream = kstream->internal_stream;
+
+	va_start(args, fmt);
+
+	if (string_stream_vadd(stream, fmt, args))
+		kunit_err(kstream->test,
+			  "Failed to allocate fragment: %s\n",
+			  fmt);
+
+	va_end(args);
+}
+
+void kunit_stream_append(struct kunit_stream *kstream,
+			 struct kunit_stream *other)
+{
+	int ret;
+
+	ret = string_stream_append(kstream->internal_stream,
+				   other->internal_stream);
+
+	if (ret)
+		kunit_err(kstream->test,
+			  "Failed to append other stream: %d\n", ret);
+}
+
+void kunit_stream_clear(struct kunit_stream *kstream)
+{
+	string_stream_clear(kstream->internal_stream);
+}
+
+void kunit_stream_commit(struct kunit_stream *kstream)
+{
+	struct string_stream *stream = kstream->internal_stream;
+	struct string_stream_fragment *fragment;
+	struct kunit *test = kstream->test;
+	char *buf;
+
+	buf = string_stream_get_string(stream);
+	if (!buf) {
+		kunit_err(test,
+			  "Could not allocate buffer, dumping stream:\n");
+		list_for_each_entry(fragment, &stream->fragments, node) {
+			kunit_err(test, fragment->fragment);
+		}
+		kunit_err(test, "\n");
+	} else {
+		kunit_printk(kstream->level, test, buf);
+		kfree(buf);
+	}
+
+	kunit_stream_clear(kstream);
+}
+
+static int kunit_stream_init(struct kunit_resource *res, void *context)
+{
+	struct kunit *test = context;
+	struct kunit_stream *stream;
+
+	stream = kzalloc(sizeof(*stream), GFP_KERNEL);
+	if (!stream)
+		return -ENOMEM;
+
+	res->allocation = stream;
+	stream->test = test;
+	stream->internal_stream = alloc_string_stream(test);
+
+	if (!stream->internal_stream)
+		return -ENOMEM;
+
+	return 0;
+}
+
+static void kunit_stream_free(struct kunit_resource *res)
+{
+	struct kunit_stream *stream = res->allocation;
+
+	if (!string_stream_is_empty(stream->internal_stream)) {
+		kunit_err(stream->test,
+			  "End of test case reached with uncommitted stream entries\n");
+		kunit_stream_commit(stream);
+	}
+}
+
+struct kunit_stream *alloc_kunit_stream(struct kunit *test, const char *level)
+{
+	struct kunit_stream *kstream;
+
+	kstream = kunit_alloc_resource(test,
+				       kunit_stream_init,
+				       kunit_stream_free,
+				       GFP_KERNEL,
+				       test);
+
+	if (!kstream)
+		return NULL;
+
+	kstream->level = level;
+
+	return kstream;
+}
diff --git a/kunit/test.c b/kunit/test.c
index 4c178a817f2fe..fdab07bb0b529 100644
--- a/kunit/test.c
+++ b/kunit/test.c
@@ -120,6 +120,12 @@ static void kunit_print_test_case_ok_not_ok(struct kunit_case *test_case,
 			      test_case->name);
 }
 
+void kunit_fail(struct kunit *test, struct kunit_stream *stream)
+{
+	kunit_set_failure(test);
+	kunit_stream_commit(stream);
+}
+
 void kunit_init_test(struct kunit *test, const char *name)
 {
 	spin_lock_init(&test->lock);
-- 
2.22.0.510.g264f2c817a-goog