A utility driver for doing client/server HTTP transaction...

net/tools/fetch/fetch_client.cc

Index: net/tools/fetch/fetch_client.cc
===================================================================
--- net/tools/fetch/fetch_client.cc	(revision 0)
+++ net/tools/fetch/fetch_client.cc	(revision 0)
@@ -0,0 +1,185 @@
+// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/at_exit.h"
+#include "base/command_line.h"
+#include "base/message_loop.h"
+#include "base/singleton.h"
+#include "base/stats_counters.h"
+#include "base/string_util.h"
+#include "net/base/completion_callback.h"
+#include "net/base/io_buffer.h"
+#include "net/base/net_errors.h"
+#include "net/http/http_cache.h"
+#include "net/http/http_network_layer.h"
+#include "net/http/http_request_info.h"
+#include "net/http/http_transaction.h"
+#include "net/proxy/proxy_service.h"
+
+void usage(const char* program_name) {
+  printf("usage: %s --url=<url>  [--n=<clients>] [--stats] [--use_cache]\n",
+         program_name);
+  exit(1);
+}
+
+// Test Driver
+class Driver {
+ public:
+  Driver()
+      : clients_(0) {}
+
+  void ClientStarted() { clients_++; }
+  void ClientStopped() {
+    if (!--clients_) {
+      MessageLoop::current()->Quit();
+    }
+  }
+
+ private:
+  int clients_;
+};
+
+// A network client
+class Client {
+ public:
+  Client(net::HttpTransactionFactory* factory, const std::string& url) :
+      url_(url),
+      transaction_(factory->CreateTransaction()),
+      buffer_(new net::IOBuffer(kBufferSize)),
+      ALLOW_THIS_IN_INITIALIZER_LIST(
+          connect_callback_(this, &Client::OnConnectComplete)),
+      ALLOW_THIS_IN_INITIALIZER_LIST(
+          read_callback_(this, &Client::OnReadComplete)) {
+    buffer_->AddRef();
+    driver_->ClientStarted();
+    request_info_.url = url_;
+    request_info_.method = "GET";
+    int state = transaction_->Start(&request_info_, &connect_callback_);
+    DCHECK(state == net::ERR_IO_PENDING);
+  };
+
+ private:
+  void OnConnectComplete(int result) {
+    // Do work here.
+    int state = transaction_->Read(buffer_.get(), kBufferSize, &read_callback_);
+    if (state == net::ERR_IO_PENDING)
+      return;  // IO has started.
+    if (state < 0)
+      return;  // ERROR!
+    OnReadComplete(state);
+  }
+
+  void OnReadComplete(int result) {
+    if (result == 0) {
+      OnRequestComplete(result);
+      return;
+    }
+
+    // Deal with received data here.
+    static StatsCounter bytes_read("FetchClient.bytes_read");
+    bytes_read.Add(result);
+
+    // Issue a read for more data.
+    int state = transaction_->Read(buffer_.get(), kBufferSize, &read_callback_);
+    if (state == net::ERR_IO_PENDING)
+      return;  // IO has started.
+    if (state < 0)
+      return;  // ERROR!
+    OnReadComplete(state);
+  }
+
+  void OnRequestComplete(int result) {
+    static StatsCounter requests("FetchClient.requests");
+    requests.Increment();
+    driver_->ClientStopped();
+    printf(".");
+  }
+
+  static const int kBufferSize = (16 * 1024);
+  GURL url_;
+  net::HttpRequestInfo request_info_;
+  scoped_ptr<net::HttpTransaction> transaction_;
+  scoped_ptr<net::IOBuffer> buffer_;
+  net::CompletionCallbackImpl<Client> connect_callback_;
+  net::CompletionCallbackImpl<Client> read_callback_;
+  Singleton<Driver> driver_;
+};
+
+int main(int argc, char**argv) {
+  base::AtExitManager exit;
+  StatsTable table("fetchclient", 50, 1000);
+  table.set_current(&table);
+
+  CommandLine::Init(0, NULL);
+  const CommandLine& parsed_command_line = *CommandLine::ForCurrentProcess();
+  std::string url = WideToASCII(parsed_command_line.GetSwitchValue(L"url"));
+  if (!url.length())
+    usage(argv[0]);
+  int client_limit = 1;
+  if (parsed_command_line.HasSwitch(L"n"))
+    StringToInt(WideToASCII(parsed_command_line.GetSwitchValue(L"n")),
+                &client_limit);
+  bool use_cache = parsed_command_line.HasSwitch(L"use-cache");
+
+  // Do work here.
+  MessageLoop loop;
+
+  scoped_ptr<net::ProxyService> proxy_service(net::ProxyService::CreateNull());
+  net::HttpTransactionFactory* factory = NULL;
+  if (use_cache)
+    factory = new net::HttpCache(proxy_service.get(), 0);
+  else
+    factory = new net::HttpNetworkLayer(proxy_service.get());
+
+  {
+    StatsCounterTimer driver_time("FetchClient.total_time");
+    StatsScope<StatsCounterTimer> scope(driver_time);
+
+    Client** clients = new Client*[client_limit];
+    for (int i = 0; i < client_limit; i++)
+      clients[i] = new Client(factory, url);
+
+    MessageLoop::current()->Run();
+  }
+
+  // Print Statistics here.
+  int num_clients = table.GetCounterValue("c:FetchClient.requests");
+  int test_time = table.GetCounterValue("t:FetchClient.total_time");
+  int bytes_read = table.GetCounterValue("c:FetchClient.bytes_read");
+
+  printf("\n");
+  printf("Clients     : %d\n", num_clients);
+  printf("Time        : %dms\n", test_time);
+  printf("Bytes Read  : %d\n", bytes_read); 
+  if (test_time > 0) {
+    const char *units = "bps";
+    double bps = static_cast<float>(bytes_read * 8) /
+        (static_cast<float>(test_time) / 1000.0);
+
+    if (bps > (1024*1024)) {
+      bps /= (1024*1024);
+      units = "Mbps";
+    } else if (bps > 1024) {
+      bps /= 1024;
+      units = "Kbps";
+    }
+    printf("Bandwidth   : %.2f%s\n", bps, units);
+  }
+
+  if (parsed_command_line.HasSwitch(L"stats")) {
+    // Dump the stats table.
+    printf("<stats>\n");
+    int counter_max = table.GetMaxCounters();
+    for (int index=0; index < counter_max; index++) {
+      std::string name(table.GetRowName(index));
+      if (name.length() > 0) {
+        int value = table.GetRowValue(index);
+        printf("%s:\t%d\n", name.c_str(), value);
+         
+      }
+    }
+    printf("</stats>\n");
+  }
+  return 0;
+}