Initial checkin of gRPC to third_party/

third_party/grpc/test/cpp/interop/stress_interop_client.cc

Index: third_party/grpc/test/cpp/interop/stress_interop_client.cc
diff --git a/third_party/grpc/test/cpp/interop/stress_interop_client.cc b/third_party/grpc/test/cpp/interop/stress_interop_client.cc
new file mode 100644
index 0000000000000000000000000000000000000000..b581e9b33cc3162d6a8a7bcdbefd65cbe631f68a
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+++ b/third_party/grpc/test/cpp/interop/stress_interop_client.cc
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+/*
+ *
+ * Copyright 2015-2016, 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.
+ *is % allowed in string
+ */
+
+#include "test/cpp/interop/stress_interop_client.h"
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include <grpc++/create_channel.h>
+
+#include "test/cpp/interop/interop_client.h"
+#include "test/cpp/util/metrics_server.h"
+
+namespace grpc {
+namespace testing {
+
+using std::pair;
+using std::vector;
+
+WeightedRandomTestSelector::WeightedRandomTestSelector(
+    const vector<pair<TestCaseType, int>>& tests)
+    : tests_(tests) {
+  total_weight_ = 0;
+  for (auto it = tests.begin(); it != tests.end(); it++) {
+    total_weight_ += it->second;
+  }
+}
+
+// Returns a weighted-randomly selected test case based on the test weights
+// passed in the constructror
+TestCaseType WeightedRandomTestSelector::GetNextTest() const {
+  int random = 0;
+  TestCaseType selected_test = UNKNOWN_TEST;
+
+  // Get a random number from [0 to the total_weight - 1]
+  random = rand() % total_weight_;
+
+  int weight_sofar = 0;
+  for (auto it = tests_.begin(); it != tests_.end(); it++) {
+    weight_sofar += it->second;
+    if (random < weight_sofar) {
+      selected_test = it->first;
+      break;
+    }
+  }
+
+  // It is a bug in the logic if no test is selected at this point
+  GPR_ASSERT(selected_test != UNKNOWN_TEST);
+  return selected_test;
+}
+
+StressTestInteropClient::StressTestInteropClient(
+    int test_id, const grpc::string& server_address,
+    std::shared_ptr<Channel> channel,
+    const WeightedRandomTestSelector& test_selector, long test_duration_secs,
+    long sleep_duration_ms, long metrics_collection_interval_secs)
+    : test_id_(test_id),
+      server_address_(server_address),
+      channel_(channel),
+      interop_client_(new InteropClient(channel, false)),
+      test_selector_(test_selector),
+      test_duration_secs_(test_duration_secs),
+      sleep_duration_ms_(sleep_duration_ms),
+      metrics_collection_interval_secs_(metrics_collection_interval_secs) {}
+
+void StressTestInteropClient::MainLoop(std::shared_ptr<Gauge> qps_gauge) {
+  gpr_log(GPR_INFO, "Running test %d. ServerAddr: %s", test_id_,
+          server_address_.c_str());
+
+  gpr_timespec test_end_time =
+      gpr_time_add(gpr_now(GPR_CLOCK_REALTIME),
+                   gpr_time_from_seconds(test_duration_secs_, GPR_TIMESPAN));
+
+  gpr_timespec current_time = gpr_now(GPR_CLOCK_REALTIME);
+  gpr_timespec next_stat_collection_time = current_time;
+  gpr_timespec collection_interval =
+      gpr_time_from_seconds(metrics_collection_interval_secs_, GPR_TIMESPAN);
+  long num_calls_per_interval = 0;
+
+  while (test_duration_secs_ < 0 ||
+         gpr_time_cmp(gpr_now(GPR_CLOCK_REALTIME), test_end_time) < 0) {
+    // Select the test case to execute based on the weights and execute it
+    TestCaseType test_case = test_selector_.GetNextTest();
+    gpr_log(GPR_DEBUG, "%d - Executing the test case %d", test_id_, test_case);
+    RunTest(test_case);
+
+    num_calls_per_interval++;
+
+    // See if its time to collect stats yet
+    current_time = gpr_now(GPR_CLOCK_REALTIME);
+    if (gpr_time_cmp(next_stat_collection_time, current_time) < 0) {
+      qps_gauge->Set(num_calls_per_interval /
+                     metrics_collection_interval_secs_);
+
+      num_calls_per_interval = 0;
+      next_stat_collection_time =
+          gpr_time_add(current_time, collection_interval);
+    }
+
+    // Sleep between successive calls if needed
+    if (sleep_duration_ms_ > 0) {
+      gpr_timespec sleep_time =
+          gpr_time_add(gpr_now(GPR_CLOCK_REALTIME),
+                       gpr_time_from_millis(sleep_duration_ms_, GPR_TIMESPAN));
+      gpr_sleep_until(sleep_time);
+    }
+  }
+}
+
+// TODO(sree): Add all interop tests
+void StressTestInteropClient::RunTest(TestCaseType test_case) {
+  switch (test_case) {
+    case EMPTY_UNARY: {
+      interop_client_->DoEmpty();
+      break;
+    }
+    case LARGE_UNARY: {
+      interop_client_->DoLargeUnary();
+      break;
+    }
+    case LARGE_COMPRESSED_UNARY: {
+      interop_client_->DoLargeCompressedUnary();
+      break;
+    }
+    case CLIENT_STREAMING: {
+      interop_client_->DoRequestStreaming();
+      break;
+    }
+    case SERVER_STREAMING: {
+      interop_client_->DoResponseStreaming();
+      break;
+    }
+    case EMPTY_STREAM: {
+      interop_client_->DoEmptyStream();
+      break;
+    }
+    default: {
+      gpr_log(GPR_ERROR, "Invalid test case (%d)", test_case);
+      GPR_ASSERT(false);
+      break;
+    }
+  }
+}
+
+}  // namespace testing
+}  // namespace grpc