11 files changed, 240 insertions, 0 deletions
diff --git a/test/core/census/data/context_empty.pb b/test/core/census/data/context_empty.pb
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/test/core/census/data/context_empty.pb
diff --git a/test/core/census/data/context_empty.txt b/test/core/census/data/context_empty.txt
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/test/core/census/data/context_empty.txt
diff --git a/test/core/census/data/context_full.pb b/test/core/census/data/context_full.pb
new file mode 100644
index 0000000000..80ebcf280b
--- /dev/null
+++ b/test/core/census/data/context_full.pb
diff --git a/test/core/census/data/context_full.txt b/test/core/census/data/context_full.txt
new file mode 100644
index 0000000000..7901a10c33
--- /dev/null
+++ b/test/core/census/data/context_full.txt
@@ -0,0 +1,3 @@
+trace_id { hi : 5; lo : 1 }
+span_id : 7
+is_sampled : true
diff --git a/test/core/census/data/context_no_sample.pb b/test/core/census/data/context_no_sample.pb
new file mode 100644
index 0000000000..ab7ad7d109
--- /dev/null
+++ b/test/core/census/data/context_no_sample.pb
diff --git a/test/core/census/data/context_no_sample.txt b/test/core/census/data/context_no_sample.txt
new file mode 100644
index 0000000000..150298002f
--- /dev/null
+++ b/test/core/census/data/context_no_sample.txt
@@ -0,0 +1,2 @@
+trace_id { hi : 5; lo : 1 }
+span_id : 7
diff --git a/test/core/census/data/context_span_only.pb b/test/core/census/data/context_span_only.pb
new file mode 100644
index 0000000000..2a9527a75a
--- /dev/null
+++ b/test/core/census/data/context_span_only.pb
diff --git a/test/core/census/data/context_span_only.txt b/test/core/census/data/context_span_only.txt
new file mode 100644
index 0000000000..d90de2e614
--- /dev/null
+++ b/test/core/census/data/context_span_only.txt
@@ -0,0 +1,2 @@
+span_id : 7
+is_sampled : true
diff --git a/test/core/census/data/context_trace_only.pb b/test/core/census/data/context_trace_only.pb
new file mode 100644
index 0000000000..7fdf6f61a3
--- /dev/null
+++ b/test/core/census/data/context_trace_only.pb
diff --git a/test/core/census/data/context_trace_only.txt b/test/core/census/data/context_trace_only.txt
new file mode 100644
index 0000000000..9b68a6aa92
--- /dev/null
+++ b/test/core/census/data/context_trace_only.txt
@@ -0,0 +1,2 @@
+trace_id { hi : 5; lo : 1 }
+is_sampled : true
diff --git a/test/core/census/trace_context_test.c b/test/core/census/trace_context_test.c
new file mode 100644
index 0000000000..ee409e8d1a
--- /dev/null
+++ b/test/core/census/trace_context_test.c
@@ -0,0 +1,231 @@
+/*
+ *
+ * Copyright 2016, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include <grpc/census.h>
+#include <grpc/support/log.h>
+#include <grpc/support/port_platform.h>
+#include <grpc/support/useful.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include "src/core/ext/census/base_resources.h"
+#include "src/core/ext/census/resource.h"
+#include "test/core/util/test_config.h"
+
+#include "src/core/ext/census/gen/trace_context.pb.h"
+#include "src/core/ext/census/trace_context.h"
+#include "third_party/nanopb/pb_decode.h"
+#include "third_party/nanopb/pb_encode.h"
+
+#define BUF_SIZE 256
+
+/* Encodes a TraceContext structure (ctxt1) to a buffer, and then decodes it
+to a second TraceContext (ctxt2).  Validates that the resulting TraceContext
+has a span_id, trace_id, and that the values are equal to those in initial
+TraceContext. On success, returns true.  If encode_trace_context returns 0,
+decode_trace_context fails, or the resulting TraceContext is missing a trace_id
+or span_id, it will return false. */
+bool validate_encode_decode_context(google_trace_TraceContext *ctxt1,
+                                    uint8_t *buffer, size_t buf_size) {
+  google_trace_TraceContext ctxt2 = google_trace_TraceContext_init_zero;
+  size_t msg_length;
+  GPR_ASSERT(ctxt1->has_trace_id && ctxt1->has_span_id);
+
+  msg_length = encode_trace_context(ctxt1, buffer, buf_size);
+  if (msg_length == 0) {
+    return false;
+  }
+
+  if (!decode_trace_context(&ctxt2, buffer, msg_length)) {
+    return false;
+  }
+
+  if (!ctxt2.has_trace_id || !ctxt2.has_span_id) {
+    return false;
+  }
+
+  GPR_ASSERT(
+      ctxt1->trace_id.hi == ctxt2.trace_id.hi &&
+      ctxt1->trace_id.lo == ctxt2.trace_id.lo &&
+      ctxt1->span_id == ctxt2.span_id &&
+      ctxt1->has_is_sampled == ctxt2.has_is_sampled &&
+      (ctxt1->has_is_sampled ? ctxt1->is_sampled == ctxt2.is_sampled : true));
+
+  return true;
+}
+
+/* Decodes a proto-encoded TraceContext from a buffer.  If decode_trace_context
+fails or the resulting TraceContext is missing a trace_id or span_id it will
+return false, otherwise returns true. */
+bool validate_decode_context(google_trace_TraceContext *ctxt, uint8_t *buffer,
+                             size_t msg_length) {
+  // Validate the decoding of a context written to buffer.
+  if (!decode_trace_context(ctxt, buffer, msg_length)) {
+    return false;
+  }
+
+  if (!ctxt->has_trace_id || !ctxt->has_span_id) {
+    return false;
+  }
+
+  return true;
+}
+
+/* Read an encoded trace context from a file.  Validates that the decoding
+gives the expected result (succeed). */
+static void read_and_validate_context_from_file(google_trace_TraceContext *ctxt,
+                                                const char *file,
+                                                const bool succeed) {
+  uint8_t buffer[BUF_SIZE];
+  FILE *input = fopen(file, "rb");
+  GPR_ASSERT(input != NULL);
+  size_t nbytes = fread(buffer, 1, BUF_SIZE, input);
+  GPR_ASSERT(nbytes <= BUF_SIZE && feof(input) && !ferror(input));
+  bool res = validate_decode_context(ctxt, buffer, nbytes);
+  GPR_ASSERT(res == succeed);
+  GPR_ASSERT(fclose(input) == 0);
+}
+
+// Test full proto-buffer.
+static void test_full() {
+  google_trace_TraceContext ctxt = google_trace_TraceContext_init_zero;
+  read_and_validate_context_from_file(
+      &ctxt, "test/core/census/data/context_full.pb", true);
+}
+
+// Test empty proto-buffer.
+static void test_empty() {
+  google_trace_TraceContext ctxt = google_trace_TraceContext_init_zero;
+  read_and_validate_context_from_file(
+      &ctxt, "test/core/census/data/context_empty.pb", false);
+}
+
+// Test proto-buffer with only trace_id.
+static void test_trace_only() {
+  google_trace_TraceContext ctxt = google_trace_TraceContext_init_zero;
+  read_and_validate_context_from_file(
+      &ctxt, "test/core/census/data/context_trace_only.pb", false);
+}
+
+// Test proto-buffer with only span_id.
+static void test_span_only() {
+  google_trace_TraceContext ctxt = google_trace_TraceContext_init_zero;
+  read_and_validate_context_from_file(
+      &ctxt, "test/core/census/data/context_span_only.pb", false);
+}
+
+// Test proto-buffer without is_sampled value.
+static void test_no_sample() {
+  google_trace_TraceContext ctxt = google_trace_TraceContext_init_zero;
+  read_and_validate_context_from_file(
+      &ctxt, "test/core/census/data/context_no_sample.pb", true);
+  GPR_ASSERT(ctxt.has_is_sampled == false && ctxt.is_sampled == false);
+}
+
+static void test_encode_decode() {
+  uint8_t buffer[BUF_SIZE] = {0};
+
+  google_trace_TraceContext ctxt1 = google_trace_TraceContext_init_zero;
+  ctxt1.has_trace_id = true;
+  ctxt1.trace_id.has_hi = true;
+  ctxt1.trace_id.has_lo = true;
+  ctxt1.trace_id.lo = 1;
+  ctxt1.trace_id.hi = 2;
+  ctxt1.has_span_id = true;
+  ctxt1.span_id = 3;
+  validate_encode_decode_context(&ctxt1, buffer, sizeof(buffer));
+
+  google_trace_TraceContext ctxt2 = google_trace_TraceContext_init_zero;
+  ctxt2.has_trace_id = true;
+  ctxt2.trace_id.has_hi = false;
+  ctxt2.trace_id.has_lo = false;
+  ctxt2.has_span_id = true;
+  validate_encode_decode_context(&ctxt2, buffer, sizeof(buffer));
+}
+
+// Test a corrupted proto-buffer.
+static void test_corrupt() {
+  uint8_t buffer[BUF_SIZE] = {0};
+  google_trace_TraceContext ctxt1 = google_trace_TraceContext_init_zero;
+  size_t msg_length;
+
+  ctxt1.has_trace_id = true;
+  ctxt1.trace_id.has_hi = true;
+  ctxt1.trace_id.has_lo = true;
+  ctxt1.trace_id.lo = 1;
+  ctxt1.trace_id.hi = 2;
+  ctxt1.has_span_id = true;
+  ctxt1.span_id = 3;
+  ctxt1.is_sampled = true;
+  msg_length = encode_trace_context(&ctxt1, buffer, sizeof(buffer));
+
+  /* Corrupt some bytes.  255 (0xFF) should be illegal for the first byte of the
+  proto encoded object. */
+  buffer[0] = 255;
+
+  bool res = validate_decode_context(&ctxt1, buffer, msg_length);
+  GPR_ASSERT(res == false);
+}
+
+static void test_buffer_size() {
+  // This buffer is too small, so the encode should fail.
+  uint8_t buffer[16] = {0};
+  google_trace_TraceContext ctxt1 = google_trace_TraceContext_init_zero;
+  size_t msg_length;
+
+  ctxt1.has_trace_id = true;
+  ctxt1.trace_id.has_hi = true;
+  ctxt1.trace_id.has_lo = true;
+  ctxt1.trace_id.lo = 1;
+  ctxt1.trace_id.hi = 2;
+  ctxt1.has_span_id = true;
+  ctxt1.span_id = 3;
+  ctxt1.is_sampled = true;
+  msg_length = encode_trace_context(&ctxt1, buffer, sizeof(buffer));
+
+  GPR_ASSERT(msg_length == 0);
+}
+
+int main(int argc, char **argv) {
+  grpc_test_init(argc, argv);
+  test_full();
+  test_empty();
+  test_trace_only();
+  test_span_only();
+  test_encode_decode();
+  test_corrupt();
+  test_no_sample();
+  test_buffer_size();
+
+  return 0;
+}