net/log/write_to_file_net_log_observer.cc

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "net/log/write_to_file_net_log_observer.h"
   6
   7 #include <stdio.h>
   8
   9 #include <set>
  10
  11 #include "base/json/json_writer.h"
  12 #include "base/logging.h"
  13 #include "base/memory/scoped_ptr.h"
  14 #include "base/values.h"
  15 #include "net/log/net_log_util.h"
  16 #include "net/url_request/url_request_context.h"
  17
  18 namespace net {
  19
  20 WriteToFileNetLogObserver::WriteToFileNetLogObserver()
  21     : capture_mode_(NetLogCaptureMode::Default()), added_events_(false) {
  22 }
  23
  24 WriteToFileNetLogObserver::~WriteToFileNetLogObserver() {
  25 }
  26
  27 void WriteToFileNetLogObserver::set_capture_mode(
  28     net::NetLogCaptureMode capture_mode) {
  29   DCHECK(!net_log());
  30   capture_mode_ = capture_mode;
  31 }
  32
  33 void WriteToFileNetLogObserver::StartObserving(
  34     net::NetLog* net_log,
  35     base::ScopedFILE file,
  36     base::Value* constants,
  37     net::URLRequestContext* url_request_context) {
  38   DCHECK(file.get());
  39   file_ = file.Pass();
  40   added_events_ = false;
  41
  42   // Write constants to the output file.  This allows loading files that have
  43   // different source and event types, as they may be added and removed
  44   // between Chrome versions.
  45   std::string json;
  46   if (constants) {
  47     base::JSONWriter::Write(constants, &json);
  48   } else {
  49     scoped_ptr<base::DictionaryValue> scoped_constants(GetNetConstants());
  50     base::JSONWriter::Write(scoped_constants.get(), &json);
  51   }
  52   fprintf(file_.get(), "{\"constants\": %s,\n", json.c_str());
  53
  54   // Start events array.  It's closed in StopObserving().
  55   fprintf(file_.get(), "\"events\": [\n");
  56
  57   // Add events for in progress requests if a context is given.
  58   if (url_request_context) {
  59     DCHECK(url_request_context->CalledOnValidThread());
  60
  61     std::set<URLRequestContext*> contexts;
  62     contexts.insert(url_request_context);
  63     CreateNetLogEntriesForActiveObjects(contexts, this);
  64   }
  65
  66   net_log->DeprecatedAddObserver(this, capture_mode_);
  67 }
  68
  69 void WriteToFileNetLogObserver::StopObserving(
  70     net::URLRequestContext* url_request_context) {
  71   net_log()->DeprecatedRemoveObserver(this);
  72
  73   // End events array.
  74   fprintf(file_.get(), "]");
  75
  76   // Write state of the URLRequestContext when logging stopped.
  77   if (url_request_context) {
  78     DCHECK(url_request_context->CalledOnValidThread());
  79
  80     std::string json;
  81     scoped_ptr<base::DictionaryValue> net_info =
  82         GetNetInfo(url_request_context, NET_INFO_ALL_SOURCES);
  83     base::JSONWriter::Write(net_info.get(), &json);
  84     fprintf(file_.get(), ",\"tabInfo\": %s\n", json.c_str());
  85   }
  86   fprintf(file_.get(), "}");
  87
  88   file_.reset();
  89 }
  90
  91 void WriteToFileNetLogObserver::OnAddEntry(const net::NetLog::Entry& entry) {
  92   // Add a comma and newline for every event but the first.  Newlines are needed
  93   // so can load partial log files by just ignoring the last line.  For this to
  94   // work, lines cannot be pretty printed.
  95   scoped_ptr<base::Value> value(entry.ToValue());
  96   std::string json;
  97   base::JSONWriter::Write(value.get(), &json);
  98   fprintf(file_.get(), "%s%s", (added_events_ ? ",\n" : ""), json.c_str());
  99   added_events_ = true;
 100 }
 101
 102 }  // namespace net