Compiling again

2 files changed, 181 insertions, 0 deletions

diff --git a/test/core/backoff/BUILD b/test/core/backoff/BUILD
new file mode 100644
index 0000000000..6c2ceb499b
--- /dev/null
+++ b/test/core/backoff/BUILD
@@ -0,0 +1,34 @@
+# Copyright 2016 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.
+
+load("//bazel:grpc_build_system.bzl", "grpc_cc_library", "grpc_cc_test", "grpc_cc_binary")
+
+licenses(["notice"])  # Apache v2
+
+package(
+    features = [
+        "-layering_check",
+        "-parse_headers",
+    ],
+)
+
+grpc_cc_test(
+    name = "backoff_test",
+    srcs = ["backoff_test.c"],
+    language = "C",
+    deps = [
+        "//:gpr",
+        "//test/core/util:gpr_test_util",
+    ],
+)
diff --git a/test/core/backoff/backoff_test.c b/test/core/backoff/backoff_test.c
new file mode 100644
index 0000000000..302ac7b3a0
--- /dev/null
+++ b/test/core/backoff/backoff_test.c
@@ -0,0 +1,147 @@
+/*
+ *
+ * Copyright 2016 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 "src/core/lib/backoff/backoff.h"
+
+#include <grpc/support/log.h>
+
+#include "test/core/util/test_config.h"
+
+static void test_constant_backoff(void) {
+  grpc_backoff backoff;
+  grpc_backoff_init(&backoff, 200 /* initial timeout */, 1.0 /* multiplier */,
+                    0.0 /* jitter */, 100 /* min timeout */,
+                    1000 /* max timeout */);
+
+  grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
+  grpc_millis next = grpc_backoff_begin(&exec_ctx, &backoff);
+  GPR_ASSERT(next - grpc_exec_ctx_now(&exec_ctx) == 200);
+  for (int i = 0; i < 10000; i++) {
+    next = grpc_backoff_step(&exec_ctx, &backoff);
+    GPR_ASSERT(next - grpc_exec_ctx_now(&exec_ctx) == 200);
+    exec_ctx.now = next;
+  }
+  grpc_exec_ctx_finish(&exec_ctx);
+}
+
+static void test_min_connect(void) {
+  grpc_backoff backoff;
+  grpc_backoff_init(&backoff, 100 /* initial timeout */, 1.0 /* multiplier */,
+                    0.0 /* jitter */, 200 /* min timeout */,
+                    1000 /* max timeout */);
+
+  grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
+  grpc_millis next = grpc_backoff_begin(&exec_ctx, &backoff);
+  GPR_ASSERT(next - grpc_exec_ctx_now(&exec_ctx) == 200);
+  grpc_exec_ctx_finish(&exec_ctx);
+}
+
+static void test_no_jitter_backoff(void) {
+  grpc_backoff backoff;
+  grpc_backoff_init(&backoff, 2 /* initial timeout */, 2.0 /* multiplier */,
+                    0.0 /* jitter */, 1 /* min timeout */,
+                    513 /* max timeout */);
+  // x_1 = 2
+  // x_n = 2**i + x_{i-1} ( = 2**(n+1) - 2 )
+  grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
+  grpc_millis next = grpc_backoff_begin(&exec_ctx, &backoff);
+  GPR_ASSERT(next - grpc_exec_ctx_now(&exec_ctx) == 2);
+  exec_ctx.now = next;
+  next = grpc_backoff_step(&exec_ctx, &backoff);
+  GPR_ASSERT(next - grpc_exec_ctx_now(&exec_ctx) == 6);
+  exec_ctx.now = next;
+  next = grpc_backoff_step(&exec_ctx, &backoff);
+  GPR_ASSERT(next - grpc_exec_ctx_now(&exec_ctx) == 14);
+  exec_ctx.now = next;
+  next = grpc_backoff_step(&exec_ctx, &backoff);
+  GPR_ASSERT(next - grpc_exec_ctx_now(&exec_ctx) == 30);
+  exec_ctx.now = next;
+  next = grpc_backoff_step(&exec_ctx, &backoff);
+  GPR_ASSERT(next - grpc_exec_ctx_now(&exec_ctx) == 62);
+  exec_ctx.now = next;
+  next = grpc_backoff_step(&exec_ctx, &backoff);
+  GPR_ASSERT(next - grpc_exec_ctx_now(&exec_ctx) == 126);
+  exec_ctx.now = next;
+  next = grpc_backoff_step(&exec_ctx, &backoff);
+  GPR_ASSERT(next - grpc_exec_ctx_now(&exec_ctx) == 254);
+  exec_ctx.now = next;
+  next = grpc_backoff_step(&exec_ctx, &backoff);
+  GPR_ASSERT(next - grpc_exec_ctx_now(&exec_ctx) == 510);
+  exec_ctx.now = next;
+  next = grpc_backoff_step(&exec_ctx, &backoff);
+  GPR_ASSERT(next - grpc_exec_ctx_now(&exec_ctx) == 1022);
+  exec_ctx.now = next;
+  next = grpc_backoff_step(&exec_ctx, &backoff);
+  // Hit the maximum timeout. From this point onwards, retries will increase
+  // only by max timeout.
+  GPR_ASSERT(next - grpc_exec_ctx_now(&exec_ctx) == 1535);
+  exec_ctx.now = next;
+  next = grpc_backoff_step(&exec_ctx, &backoff);
+  GPR_ASSERT(next - grpc_exec_ctx_now(&exec_ctx) == 2048);
+  exec_ctx.now = next;
+  next = grpc_backoff_step(&exec_ctx, &backoff);
+  GPR_ASSERT(next - grpc_exec_ctx_now(&exec_ctx) == 2561);
+  grpc_exec_ctx_finish(&exec_ctx);
+}
+
+static void test_jitter_backoff(void) {
+  const int64_t initial_timeout = 500;
+  const double jitter = 0.1;
+  grpc_backoff backoff;
+  grpc_backoff_init(&backoff, initial_timeout, 1.0 /* multiplier */, jitter,
+                    100 /* min timeout */, 1000 /* max timeout */);
+
+  backoff.rng_state = 0;  // force consistent PRNG
+
+  grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
+  grpc_millis next = grpc_backoff_begin(&exec_ctx, &backoff);
+  GPR_ASSERT(next - grpc_exec_ctx_now(&exec_ctx) == 500);
+
+  int64_t expected_next_lower_bound =
+      (int64_t)((double)initial_timeout * (1 - jitter));
+  int64_t expected_next_upper_bound =
+      (int64_t)((double)initial_timeout * (1 + jitter));
+
+  for (int i = 0; i < 10000; i++) {
+    next = grpc_backoff_step(&exec_ctx, &backoff);
+
+    // next-now must be within (jitter*100)% of the previous timeout.
+    const int64_t timeout_millis = next - grpc_exec_ctx_now(&exec_ctx);
+    GPR_ASSERT(timeout_millis >= expected_next_lower_bound);
+    GPR_ASSERT(timeout_millis <= expected_next_upper_bound);
+
+    expected_next_lower_bound =
+        (int64_t)((double)timeout_millis * (1 - jitter));
+    expected_next_upper_bound =
+        (int64_t)((double)timeout_millis * (1 + jitter));
+    exec_ctx.now = next;
+  }
+  grpc_exec_ctx_finish(&exec_ctx);
+}
+
+int main(int argc, char **argv) {
+  grpc_test_init(argc, argv);
+  gpr_time_init();
+
+  test_constant_backoff();
+  test_min_connect();
+  test_no_jitter_backoff();
+  test_jitter_backoff();
+
+  return 0;
+}