1 files changed, 239 insertions, 0 deletions
diff --git a/test/core/statistics/trace_test.cc b/test/core/statistics/trace_test.cc
new file mode 100644
index 0000000000..ecbfed09ee
--- /dev/null
+++ b/test/core/statistics/trace_test.cc
@@ -0,0 +1,239 @@
+/*
+ *
+ * Copyright 2015 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#include <stdio.h>
+#include <string.h>
+
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+#include <grpc/support/port_platform.h>
+#include <grpc/support/sync.h>
+#include <grpc/support/thd.h>
+#include <grpc/support/time.h>
+#include <grpc/support/useful.h>
+#include "src/core/ext/census/census_interface.h"
+#include "src/core/ext/census/census_tracing.h"
+#include "test/core/util/test_config.h"
+
+/* Ensure all possible state transitions are called without causing problem */
+static void test_init_shutdown(void) {
+  census_tracing_init();
+  census_tracing_init();
+  census_tracing_shutdown();
+  census_tracing_shutdown();
+  census_tracing_init();
+}
+
+static void test_start_op_generates_locally_unique_ids(void) {
+/* Check that ids generated within window size of 1000 are unique.
+   TODO(hongyu): Replace O(n^2) duplicate detection algorithm with O(nlogn)
+   algorithm. Enhance the test to larger window size (>10^6) */
+#define WINDOW_SIZE 1000
+  census_op_id ids[WINDOW_SIZE];
+  int i;
+  census_init();
+  for (i = 0; i < WINDOW_SIZE; i++) {
+    ids[i] = census_tracing_start_op();
+    census_tracing_end_op(ids[i]);
+  }
+  for (i = 0; i < WINDOW_SIZE - 1; i++) {
+    int j;
+    for (j = i + 1; j < WINDOW_SIZE; j++) {
+      GPR_ASSERT(ids[i].upper != ids[j].upper || ids[i].lower != ids[j].lower);
+    }
+  }
+#undef WINDOW_SIZE
+  census_shutdown();
+}
+
+static void test_get_trace_method_name(void) {
+  census_op_id id;
+  const char write_name[] = "service/method";
+  census_tracing_init();
+  id = census_tracing_start_op();
+  census_add_method_tag(id, write_name);
+  census_internal_lock_trace_store();
+  {
+    const char* read_name =
+        census_get_trace_method_name(census_get_trace_obj_locked(id));
+    GPR_ASSERT(strcmp(read_name, write_name) == 0);
+  }
+  census_internal_unlock_trace_store();
+  census_tracing_shutdown();
+}
+
+typedef struct thd_arg {
+  int num_done;
+  gpr_cv done;
+  gpr_mu mu;
+} thd_arg;
+
+static void mimic_trace_op_sequences(void* arg) {
+  census_op_id id;
+  const char* method_name = "service_foo/method_bar";
+  int i = 0;
+  const int num_iter = 200;
+  thd_arg* args = (thd_arg*)arg;
+  GPR_ASSERT(args != NULL);
+  gpr_log(GPR_INFO, "Start trace op sequence thread.");
+  for (i = 0; i < num_iter; i++) {
+    id = census_tracing_start_op();
+    census_add_method_tag(id, method_name);
+    /* pretend doing 1us work. */
+    gpr_sleep_until(GRPC_TIMEOUT_MICROS_TO_DEADLINE(1));
+    census_tracing_end_op(id);
+  }
+  gpr_log(GPR_INFO, "End trace op sequence thread.");
+  gpr_mu_lock(&args->mu);
+  args->num_done += 1;
+  gpr_cv_broadcast(&args->done);
+  gpr_mu_unlock(&args->mu);
+}
+
+static void test_concurrency(void) {
+#define NUM_THREADS 1000
+  gpr_thd_id tid[NUM_THREADS];
+  int i = 0;
+  thd_arg arg;
+  arg.num_done = 0;
+  gpr_mu_init(&arg.mu);
+  gpr_cv_init(&arg.done);
+  census_tracing_init();
+  for (i = 0; i < NUM_THREADS; ++i) {
+    gpr_thd_new(tid + i, mimic_trace_op_sequences, &arg, NULL);
+  }
+  gpr_mu_lock(&arg.mu);
+  while (arg.num_done < NUM_THREADS) {
+    gpr_log(GPR_INFO, "num done %d", arg.num_done);
+    gpr_cv_wait(&arg.done, &arg.mu, gpr_inf_future(GPR_CLOCK_REALTIME));
+  }
+  gpr_mu_unlock(&arg.mu);
+  census_tracing_shutdown();
+#undef NUM_THREADS
+}
+
+static void test_add_method_tag_to_unknown_op_id(void) {
+  census_op_id unknown_id = {0xDEAD, 0xBEEF};
+  int ret = 0;
+  census_tracing_init();
+  ret = census_add_method_tag(unknown_id, "foo");
+  GPR_ASSERT(ret != 0);
+  census_tracing_shutdown();
+}
+
+static void test_trace_print(void) {
+  census_op_id id;
+  int i;
+  const char* annotation_txt[4] = {"abc", "", "$%^ *()_"};
+  char long_txt[CENSUS_MAX_ANNOTATION_LENGTH + 10];
+
+  memset(long_txt, 'a', GPR_ARRAY_SIZE(long_txt));
+  long_txt[CENSUS_MAX_ANNOTATION_LENGTH + 9] = '\0';
+  annotation_txt[3] = long_txt;
+
+  census_tracing_init();
+  id = census_tracing_start_op();
+  /* Adds large number of annotations to each trace */
+  for (i = 0; i < 1000; i++) {
+    census_tracing_print(id,
+                         annotation_txt[i % GPR_ARRAY_SIZE(annotation_txt)]);
+  }
+  census_tracing_end_op(id);
+
+  census_tracing_shutdown();
+}
+
+/* Returns 1 if two ids are equal, otherwise returns 0. */
+static int ids_equal(census_op_id id1, census_op_id id2) {
+  return (id1.upper == id2.upper) && (id1.lower == id2.lower);
+}
+
+static void test_get_active_ops(void) {
+  census_op_id id_1, id_2, id_3;
+  census_trace_obj** active_ops;
+  const char* annotation_txt[] = {"annotation 1", "a2"};
+  int i = 0;
+  int n = 0;
+
+  gpr_log(GPR_INFO, "test_get_active_ops");
+  census_tracing_init();
+  /* No active ops before calling start_op(). */
+  active_ops = census_get_active_ops(&n);
+  GPR_ASSERT(active_ops == NULL);
+  GPR_ASSERT(n == 0);
+
+  /* Starts one op */
+  id_1 = census_tracing_start_op();
+  census_add_method_tag(id_1, "foo_1");
+  active_ops = census_get_active_ops(&n);
+  GPR_ASSERT(active_ops != NULL);
+  GPR_ASSERT(n == 1);
+  GPR_ASSERT(ids_equal(active_ops[0]->id, id_1));
+  census_trace_obj_destroy(active_ops[0]);
+  gpr_free(active_ops);
+  active_ops = NULL;
+
+  /* Start the second and the third ops */
+  id_2 = census_tracing_start_op();
+  census_add_method_tag(id_2, "foo_2");
+  id_3 = census_tracing_start_op();
+  census_add_method_tag(id_3, "foo_3");
+
+  active_ops = census_get_active_ops(&n);
+  GPR_ASSERT(n == 3);
+  for (i = 0; i < 3; i++) {
+    census_trace_obj_destroy(active_ops[i]);
+  }
+  gpr_free(active_ops);
+  active_ops = NULL;
+
+  /* End the second op  and add annotations to the third ops */
+  census_tracing_end_op(id_2);
+  census_tracing_print(id_3, annotation_txt[0]);
+  census_tracing_print(id_3, annotation_txt[1]);
+
+  active_ops = census_get_active_ops(&n);
+  GPR_ASSERT(active_ops != NULL);
+  GPR_ASSERT(n == 2);
+  for (i = 0; i < 2; i++) {
+    census_trace_obj_destroy(active_ops[i]);
+  }
+  gpr_free(active_ops);
+  active_ops = NULL;
+
+  /* End all ops. */
+  census_tracing_end_op(id_1);
+  census_tracing_end_op(id_3);
+  active_ops = census_get_active_ops(&n);
+  GPR_ASSERT(active_ops == NULL);
+  GPR_ASSERT(n == 0);
+
+  census_tracing_shutdown();
+}
+
+int main(int argc, char** argv) {
+  grpc_test_init(argc, argv);
+  test_init_shutdown();
+  test_start_op_generates_locally_unique_ids();
+  test_get_trace_method_name();
+  test_concurrency();
+  test_add_method_tag_to_unknown_op_id();
+  test_trace_print();
+  test_get_active_ops();
+  return 0;
+}