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Subject[PATCH v11 04/18] kunit: test: add kunit_stream a std::stream like logger
From
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.

Note that kunit_stream is distinct from string_stream: whereas
string_stream is really just a string builder, kunit_stream is
specifically used for constructing expectation/assertion (introduced
later in this series) messages to a user of KUnit.

Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
---
include/kunit/kunit-stream.h | 97 +++++++++++++++++++++++++++++
include/kunit/test.h | 3 +
kunit/Makefile | 3 +-
kunit/kunit-stream.c | 115 +++++++++++++++++++++++++++++++++++
kunit/test.c | 6 ++
5 files changed, 223 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..ba0ff553b8301
--- /dev/null
+++ b/include/kunit/kunit-stream.h
@@ -0,0 +1,97 @@
+/* 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@google.com>
+ */
+
+#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. Note that the intention is to only use
+ * &struct kunit_stream to communicate with a user of KUnit, most often to
+ * communicate something about an expectation or an assertion to the user. If
+ * you want a similar interface, but aren't sure if this is the right class for
+ * you to use, you probably want to use the related string_stream class, which
+ * is allowed for generic string construction in a similar manner. This class is
+ * really only for the KUnit library to communicate certain kinds of information
+ * to KUnit users and should not be used by anyone else.
+ *
+ * A note on &struct kunit_stream's usage: a kunit_stream will generally
+ * accompany *one* expectation or assertion. Multiple expectations/assertions
+ * may be validated concurrently at any given time, even within a single test
+ * case, so sharing a kunit_stream between expectations/assertions may result in
+ * unintended consequences.
+ */
+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.
+ * @gfp: The GFP flags to use for internal allocations.
+ *
+ * Constructs a new test managed &struct kunit_stream.
+ */
+struct kunit_stream *alloc_kunit_stream(struct kunit *test,
+ const char *level,
+ gfp_t gfp);
+
+/**
+ * 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 d0bf112910caf..4b6e7d91afd34 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..42fcef8188b3a
--- /dev/null
+++ b/kunit/kunit-stream.c
@@ -0,0 +1,115 @@
+// 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@google.com>
+ */
+
+#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);
+ }
+
+ kunit_stream_clear(kstream);
+}
+
+struct kunit_stream_alloc_context {
+ struct kunit *test;
+ const char *level;
+ gfp_t gfp;
+};
+
+static int kunit_stream_init(struct kunit_resource *res, void *context)
+{
+ struct kunit_stream_alloc_context *ctx = context;
+ struct kunit_stream *stream;
+
+ stream = kunit_kzalloc(ctx->test, sizeof(*stream), ctx->gfp);
+ if (!stream)
+ return -ENOMEM;
+
+ res->allocation = stream;
+ stream->test = ctx->test;
+ stream->level = ctx->level;
+ stream->internal_stream = alloc_string_stream(ctx->test, ctx->gfp);
+
+ if (!stream->internal_stream)
+ return -ENOMEM;
+
+ return 0;
+}
+
+static void kunit_stream_free(struct kunit_resource *res)
+{
+ /* Do nothing because cleanup is handled by KUnit managed resources */
+}
+
+struct kunit_stream *alloc_kunit_stream(struct kunit *test,
+ const char *level,
+ gfp_t gfp)
+{
+ struct kunit_stream_alloc_context ctx = {
+ .test = test,
+ .level = level,
+ .gfp = gfp
+ };
+
+ return kunit_alloc_resource(test,
+ kunit_stream_init,
+ kunit_stream_free,
+ gfp,
+ &ctx);
+}
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
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