text: /*
   *
   * Copyright 2015, Google Inc.
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   * notice, this list of conditions and the following disclaimer.
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   * in the documentation and/or other materials provided with the
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   * 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
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   * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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   *is % allowed in string
   */
  
  #include <memory>
  #include <string>
  #include <thread>
  #include <utility>
  #include <vector>
  
  #include <gflags/gflags.h>
  #include <grpc++/create_channel.h>
  #include <grpc++/grpc++.h>
  #include <grpc++/impl/thd.h>
  #include <grpc/support/time.h>
  
  #include "test/cpp/interop/interop_client.h"
  #include "test/cpp/interop/stress_interop_client.h"
  #include "test/cpp/util/metrics_server.h"
  #include "test/cpp/util/test_config.h"
  #include "test/proto/metrics.grpc.pb.h"
  #include "test/proto/metrics.pb.h"
  
  DEFINE_int32(metrics_port, 8081, "The metrics server port.");
  
  DEFINE_int32(metrics_collection_interval_secs, 5,
               "How often (in seconds) should metrics be recorded.");
  
  DEFINE_int32(sleep_duration_ms, 0,
               "The duration (in millisec) between two"
               " consecutive test calls (per server) issued by the server.");
  
  DEFINE_int32(test_duration_secs, -1,
               "The length of time (in seconds) to run"
               " the test. Enter -1 if the test should run continuously until"
               " forcefully terminated.");
  
  DEFINE_string(server_addresses, "localhost:8080",
                "The list of server"
                " addresses in the format:\n"
                " \"<name_1>:<port_1>,<name_2>:<port_1>...<name_N>:<port_N>\"\n"
                " Note: <name> can be servername or IP address.");
  
  DEFINE_int32(num_channels_per_server, 1, "Number of channels for each server");
  
  DEFINE_int32(num_stubs_per_channel, 1,
               "Number of stubs per each channels to server. This number also "
               "indicates the max number of parallel RPC calls on each channel "
               "at any given time.");
  
  // TODO(sreek): Add more test cases here in future
  DEFINE_string(test_cases, "",
                "List of test cases to call along with the"
                " relative weights in the following format:\n"
                " \"<testcase_1:w_1>,<testcase_2:w_2>...<testcase_n:w_n>\"\n"
                " The following testcases are currently supported:\n"
                "   empty_unary\n"
                "   large_unary\n"
                "   large_compressed_unary\n"
                "   client_streaming\n"
                "   server_streaming\n"
                "   empty_stream\n"
                " Example: \"empty_unary:20,large_unary:10,empty_stream:70\"\n"
                " The above will execute 'empty_unary', 20% of the time,"
                " 'large_unary', 10% of the time and 'empty_stream' the remaining"
                " 70% of the time");
  
  using grpc::testing::kTestCaseList;
  using grpc::testing::MetricsService;
  using grpc::testing::MetricsServiceImpl;
  using grpc::testing::StressTestInteropClient;
  using grpc::testing::TestCaseType;
  using grpc::testing::UNKNOWN_TEST;
  using grpc::testing::WeightedRandomTestSelector;
  
  TestCaseType GetTestTypeFromName(const grpc::string& test_name) {
    TestCaseType test_case = UNKNOWN_TEST;
  
    for (auto it = kTestCaseList.begin(); it != kTestCaseList.end(); it++) {
      if (test_name == it->second) {
        test_case = it->first;
        break;
      }
    }
  
    return test_case;
  }
  
  // Converts a string of comma delimited tokens to a vector of tokens
  bool ParseCommaDelimitedString(const grpc::string& comma_delimited_str,
                                 std::vector<grpc::string>& tokens) {
    size_t bpos = 0;
    size_t epos = grpc::string::npos;
  
    while ((epos = comma_delimited_str.find(',', bpos)) != grpc::string::npos) {
      tokens.emplace_back(comma_delimited_str.substr(bpos, epos - bpos));
      bpos = epos + 1;
    }
  
    tokens.emplace_back(comma_delimited_str.substr(bpos));  // Last token
    return true;
  }
  
  // Input: Test case string "<testcase_name:weight>,<testcase_name:weight>...."
  // Output:
  //   - Whether parsing was successful (return value)
  //   - Vector of (test_type_enum, weight) pairs returned via 'tests' parameter
  bool ParseTestCasesString(const grpc::string& test_cases,
                            std::vector<std::pair<TestCaseType, int>>& tests) {
    bool is_success = true;
  
    std::vector<grpc::string> tokens;
    ParseCommaDelimitedString(test_cases, tokens);
  
    for (auto it = tokens.begin(); it != tokens.end(); it++) {
      // Token is in the form <test_name>:<test_weight>
      size_t colon_pos = it->find(':');
      if (colon_pos == grpc::string::npos) {
        gpr_log(GPR_ERROR, "Error in parsing test case string: %s", it->c_str());
        is_success = false;
        break;
      }
  
      grpc::string test_name = it->substr(0, colon_pos);
      int weight = std::stoi(it->substr(colon_pos + 1));
      TestCaseType test_case = GetTestTypeFromName(test_name);
      if (test_case == UNKNOWN_TEST) {
        gpr_log(GPR_ERROR, "Unknown test case: %s", test_name.c_str());
        is_success = false;
        break;
      }
  
      tests.emplace_back(std::make_pair(test_case, weight));
    }
  
    return is_success;
  }
  
  // For debugging purposes
  void LogParameterInfo(const std::vector<grpc::string>& addresses,
                        const std::vector<std::pair<TestCaseType, int>>& tests) {
    gpr_log(GPR_INFO, "server_addresses: %s", FLAGS_server_addresses.c_str());
    gpr_log(GPR_INFO, "test_cases : %s", FLAGS_test_cases.c_str());
    gpr_log(GPR_INFO, "sleep_duration_ms: %d", FLAGS_sleep_duration_ms);
    gpr_log(GPR_INFO, "test_duration_secs: %d", FLAGS_test_duration_secs);
  
    int num = 0;
    for (auto it = addresses.begin(); it != addresses.end(); it++) {
      gpr_log(GPR_INFO, "%d:%s", ++num, it->c_str());
    }
  
    num = 0;
    for (auto it = tests.begin(); it != tests.end(); it++) {
      TestCaseType test_case = it->first;
      int weight = it->second;
      gpr_log(GPR_INFO, "%d. TestCaseType: %d, Weight: %d", ++num, test_case,
              weight);
    }
  }
  
  int main(int argc, char** argv) {
    grpc::testing::InitTest(&argc, &argv, true);
  
    srand(time(NULL));
  
    // Parse the server addresses
    std::vector<grpc::string> server_addresses;
    ParseCommaDelimitedString(FLAGS_server_addresses, server_addresses);
  
    // Parse test cases and weights
    if (FLAGS_test_cases.length() == 0) {
      gpr_log(GPR_INFO, "Not running tests. The 'test_cases' string is empty");
      return 1;
    }
  
    std::vector<std::pair<TestCaseType, int>> tests;
    if (!ParseTestCasesString(FLAGS_test_cases, tests)) {
      gpr_log(GPR_ERROR, "Error in parsing test cases string %s ",
              FLAGS_test_cases.c_str());
      return 1;
    }
  
    LogParameterInfo(server_addresses, tests);
  
    WeightedRandomTestSelector test_selector(tests);
    MetricsServiceImpl metrics_service;
  
    gpr_log(GPR_INFO, "Starting test(s)..");
  
    std::vector<grpc::thread> test_threads;
  
    // Create and start the test threads.
    // Note that:
    // - Each server can have multiple channels (as configured by
    // FLAGS_num_channels_per_server).
    //
    // - Each channel can have multiple stubs (as configured by
    // FLAGS_num_stubs_per_channel). This is to test calling multiple RPCs in
    // parallel on the same channel.
    int thread_idx = 0;
    int server_idx = -1;
    char buffer[256];
    for (auto it = server_addresses.begin(); it != server_addresses.end(); it++) {
      ++server_idx;
      // Create channel(s) for each server
      for (int channel_idx = 0; channel_idx < FLAGS_num_channels_per_server;
           channel_idx++) {
        // TODO (sreek). This won't work for tests that require Authentication
        std::shared_ptr<grpc::Channel> channel(
            grpc::CreateChannel(*it, grpc::InsecureChannelCredentials()));
  
        // Create stub(s) for each channel
        for (int stub_idx = 0; stub_idx < FLAGS_num_stubs_per_channel;
             stub_idx++) {
          StressTestInteropClient* client = new StressTestInteropClient(
              ++thread_idx, *it, channel, test_selector, FLAGS_test_duration_secs,
              FLAGS_sleep_duration_ms, FLAGS_metrics_collection_interval_secs);
  
          bool is_already_created;
          // Gauge name
          std::snprintf(buffer, sizeof(buffer),
                        "/stress_test/server_%d/channel_%d/stub_%d/qps",
                        server_idx, channel_idx, stub_idx);
  
          test_threads.emplace_back(grpc::thread(
              &StressTestInteropClient::MainLoop, client,
              metrics_service.CreateGauge(buffer, &is_already_created)));
  
          // The Gauge should not have been already created
          GPR_ASSERT(!is_already_created);
        }
      }
    }
  
    // Start metrics server before waiting for the stress test threads
    std::unique_ptr<grpc::Server> metrics_server =
        metrics_service.StartServer(FLAGS_metrics_port);
  
    // Wait for the stress test threads to complete
    for (auto it = test_threads.begin(); it != test_threads.end(); it++) {
      it->join();
    }
  
    metrics_server->Wait();
    return 0;
  }
  