[Startup Tracing] The TraceConfig class [STALE]

base/trace_event/trace_config.cc

Index: base/trace_event/trace_config.cc
diff --git a/base/trace_event/trace_config.cc b/base/trace_event/trace_config.cc
new file mode 100644
index 0000000000000000000000000000000000000000..becebd30577a4b56195b73af061ef22268c30320
--- /dev/null
+++ b/base/trace_event/trace_config.cc
@@ -0,0 +1,595 @@
+// Copyright (c) 2015 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/trace_event/trace_config.h"
+
+#include "base/json/json_reader.h"
+#include "base/json/json_writer.h"
+#include "base/strings/string_split.h"
+#include "base/strings/string_tokenizer.h"
+#include "base/strings/stringprintf.h"
+#include "base/trace_event/trace_event.h"
+
+namespace base {
+namespace trace_event {
+
+namespace {
+
+// String options that can be used to initialize TraceOptions.
+const char kRecordUntilFull[] = "record-until-full";
+const char kRecordContinuously[] = "record-continuously";
+const char kRecordAsMuchAsPossible[] = "record-as-much-as-possible";
+const char kTraceToConsole[] = "trace-to-console";
+const char kEnableSampling[] = "enable-sampling";
+const char kEnableSystrace[] = "enable-systrace";
+const char kEnableArgumentFilter[] = "enable-argument-filter";
+
+// String parameters that can be used to parse the trace config string.
+const char kRecordModeParam[] = "record_mode";
+const char kEnableSamplingParam[] = "enable_sampling";
+const char kEnableSystraceParam[] = "enable_systrace";
+const char kIncludedCategoriesParam[] = "included_categories";
+const char kDisabledCategoriesParam[] = "disabled_categories";
+const char kExcludedCategoriesParam[] = "excluded_categories";
+const char kSyntheticDelaysParam[] = "synthetic_delays";
+
+const char kSyntheticDelayCategoryFilterPrefix[] = "DELAY(";
+
+}  // namespace
+
+bool TraceOptions::SetFromString(const std::string& options_string) {
+  record_mode = RECORD_UNTIL_FULL;
+  enable_sampling = false;
+  enable_systrace = false;
+
+  std::vector<std::string> split;
+  std::vector<std::string>::iterator iter;
+  base::SplitString(options_string, ',', &split);
+  for (iter = split.begin(); iter != split.end(); ++iter) {
+    if (*iter == kRecordUntilFull) {
+      record_mode = RECORD_UNTIL_FULL;
+    } else if (*iter == kRecordContinuously) {
+      record_mode = RECORD_CONTINUOUSLY;
+    } else if (*iter == kTraceToConsole) {
+      record_mode = ECHO_TO_CONSOLE;
+    } else if (*iter == kRecordAsMuchAsPossible) {
+      record_mode = RECORD_AS_MUCH_AS_POSSIBLE;
+    } else if (*iter == kEnableSampling) {
+      enable_sampling = true;
+    } else if (*iter == kEnableSystrace) {
+      enable_systrace = true;
+    } else if (*iter == kEnableArgumentFilter) {
+      enable_argument_filter = true;
+    } else {
+      return false;
+    }
+  }
+  return true;
+}
+
+std::string TraceOptions::ToString() const {
+  std::string ret;
+  switch (record_mode) {
+    case RECORD_UNTIL_FULL:
+      ret = kRecordUntilFull;
+      break;
+    case RECORD_CONTINUOUSLY:
+      ret = kRecordContinuously;
+      break;
+    case ECHO_TO_CONSOLE:
+      ret = kTraceToConsole;
+      break;
+    case RECORD_AS_MUCH_AS_POSSIBLE:
+      ret = kRecordAsMuchAsPossible;
+      break;
+    default:
+      NOTREACHED();
+  }
+  if (enable_sampling)
+    ret = ret + "," + kEnableSampling;
+  if (enable_systrace)
+    ret = ret + "," + kEnableSystrace;
+  if (enable_argument_filter)
+    ret = ret + "," + kEnableArgumentFilter;
+  return ret;
+}
+
+TraceConfig::TraceConfig() {
+  InitializeDefault();
+}
+
+TraceConfig::TraceConfig(const CategoryFilter& cf,
+                         const TraceOptions& options) {
+  record_mode_ = options.record_mode;
+  enable_sampling_ = options.enable_sampling;
+  enable_systrace_ = options.enable_systrace;
+
+  included_categories_ = cf.config_.included_categories_;
+  disabled_categories_ = cf.config_.disabled_categories_;
+  excluded_categories_ = cf.config_.excluded_categories_;
+  synthetic_delays_ = cf.config_.synthetic_delays_;
+}
+
+TraceConfig::TraceConfig(const std::string& category_filter_string,
+                         const std::string& trace_options_string) {
+  if (!category_filter_string.empty()) {
+    std::vector<std::string> split;
+    std::vector<std::string>::iterator iter;
+    base::SplitString(category_filter_string, ',', &split);
+    for (iter = split.begin(); iter != split.end(); ++iter) {
+      std::string category = *iter;
+      // Ignore empty categories.
+      if (category.empty())
+        continue;
+      // Synthetic delays are of the form 'DELAY(delay;option;option;...)'.
+      if (category.find(kSyntheticDelayCategoryFilterPrefix) == 0 &&
+          category.at(category.size() - 1) == ')') {
+        category = category.substr(
+            strlen(kSyntheticDelayCategoryFilterPrefix),
+            category.size() - strlen(kSyntheticDelayCategoryFilterPrefix) - 1);
+        size_t name_length = category.find(';');
+        if (name_length != std::string::npos && name_length > 0 &&
+            name_length != category.size() - 1) {
+          synthetic_delays_.push_back(category);
+        }
+      } else if (category.at(0) == '-') {
+        // Excluded categories start with '-'.
+        // Remove '-' from category string.
+        category = category.substr(1);
+        excluded_categories_.push_back(category);
+      } else if (category.compare(0, strlen(TRACE_DISABLED_BY_DEFAULT("")),
+                                  TRACE_DISABLED_BY_DEFAULT("")) == 0) {
+        disabled_categories_.push_back(category);
+      } else {
+        included_categories_.push_back(category);
+      }
+    }
+  }
+
+  record_mode_ = RECORD_UNTIL_FULL;
+  enable_sampling_ = false;
+  enable_systrace_ = false;
+  if(!trace_options_string.empty()) {
+    std::vector<std::string> split;
+    std::vector<std::string>::iterator iter;
+    base::SplitString(trace_options_string, ',', &split);
+    for (iter = split.begin(); iter != split.end(); ++iter) {
+      if (*iter == kRecordUntilFull) {
+        record_mode_ = RECORD_UNTIL_FULL;
+      } else if (*iter == kRecordContinuously) {
+        record_mode_ = RECORD_CONTINUOUSLY;
+      } else if (*iter == kTraceToConsole) {
+        record_mode_ = ECHO_TO_CONSOLE;
+      } else if (*iter == kRecordAsMuchAsPossible) {
+        record_mode_ = RECORD_AS_MUCH_AS_POSSIBLE;
+      } else if (*iter == kEnableSampling) {
+        enable_sampling_ = true;
+      } else if (*iter == kEnableSystrace) {
+        enable_systrace_ = true;
+      }
+    }
+  }
+}
+
+TraceConfig::TraceConfig(const std::string& config_string) {
+  if (!config_string.empty())
+    Initialize(config_string);
+  else
+    InitializeDefault();
+}
+
+TraceConfig::TraceConfig(const TraceConfig& tc)
+    : record_mode_(tc.record_mode_),
+      enable_sampling_(tc.enable_sampling_),
+      enable_systrace_(tc.enable_systrace_),
+      included_categories_(tc.included_categories_),
+      disabled_categories_(tc.disabled_categories_),
+      excluded_categories_(tc.excluded_categories_),
+      synthetic_delays_(tc.synthetic_delays_) {
+}
+
+TraceConfig::~TraceConfig() {
+}
+
+TraceConfig& TraceConfig::operator=(const TraceConfig& rhs) {
+  if (this == &rhs)
+    return *this;
+
+  record_mode_ = rhs.record_mode_;
+  enable_sampling_ = rhs.enable_sampling_;
+  enable_systrace_ = rhs.enable_systrace_;
+  included_categories_ = rhs.included_categories_;
+  disabled_categories_ = rhs.disabled_categories_;
+  excluded_categories_ = rhs.excluded_categories_;
+  synthetic_delays_ = rhs.synthetic_delays_;
+  return *this;
+}
+
+void TraceConfig::Initialize(const std::string& config_string) {
+  scoped_ptr<base::Value> value(base::JSONReader::Read(config_string));
+  if (!value || !value->IsType(base::Value::TYPE_DICTIONARY)) {
+    InitializeDefault();
+    return;
+  }
+  scoped_ptr<base::DictionaryValue> dict(
+        static_cast<base::DictionaryValue*>(value.release()));
+
+  record_mode_ = RECORD_UNTIL_FULL;
+  std::string record_mode;
+  if (dict->GetString(kRecordModeParam, &record_mode)) {
+    if (record_mode == kRecordUntilFull) {
+      record_mode_ = RECORD_UNTIL_FULL;
+    } else if (record_mode == kRecordContinuously) {
+      record_mode_ = RECORD_CONTINUOUSLY;
+    } else if (record_mode == kTraceToConsole) {
+      record_mode_ = ECHO_TO_CONSOLE;
+    } else if (record_mode == kRecordAsMuchAsPossible) {
+      record_mode_ = RECORD_AS_MUCH_AS_POSSIBLE;
+    }
+  }
+
+  bool enable_sampling;
+  if (!dict->GetBoolean(kEnableSamplingParam, &enable_sampling))
+    enable_sampling_ = false;
+  else
+    enable_sampling_ = enable_sampling;
+
+  bool enable_systrace;
+  if (!dict->GetBoolean(kEnableSystraceParam, &enable_systrace))
+    enable_systrace_ = false;
+  else
+    enable_systrace_ = enable_systrace;
+
+  base::ListValue* category_list = NULL;
+  if (dict->GetList(kIncludedCategoriesParam, &category_list))
+    SetCategoriesFromList(included_categories_, *category_list);
+  if (dict->GetList(kDisabledCategoriesParam, &category_list))
+    SetCategoriesFromList(disabled_categories_, *category_list);
+  if (dict->GetList(kExcludedCategoriesParam, &category_list))
+    SetCategoriesFromList(excluded_categories_, *category_list);
+  if (dict->GetList(kSyntheticDelaysParam, &category_list))
+    SetSyntheticDelaysFromList(synthetic_delays_, *category_list);
+}
+
+void TraceConfig::InitializeDefault() {
+  record_mode_ = RECORD_UNTIL_FULL;
+  enable_sampling_ = false;
+  enable_systrace_ = false;
+  excluded_categories_.push_back("*Debug");
+  excluded_categories_.push_back("*Test");
+}
+
+const TraceConfig::StringList& TraceConfig::GetSyntheticDelayValues() const {
+  return synthetic_delays_;
+}
+
+void TraceConfig::ToDict(base::DictionaryValue& dict) const {
+  switch (record_mode_) {
+    case RECORD_UNTIL_FULL:
+      dict.SetString(kRecordModeParam, kRecordUntilFull);
+      break;
+    case RECORD_CONTINUOUSLY:
+      dict.SetString(kRecordModeParam, kRecordContinuously);
+      break;
+    case ECHO_TO_CONSOLE:
+      dict.SetString(kRecordModeParam, kTraceToConsole);
+      break;
+    case RECORD_AS_MUCH_AS_POSSIBLE:
+      dict.SetString(kRecordModeParam, kRecordAsMuchAsPossible);
+      break;
+    default:
+      NOTREACHED();
+  }
+
+  if (enable_sampling_)
+    dict.SetBoolean(kEnableSamplingParam, true);
+  else
+    dict.SetBoolean(kEnableSamplingParam, false);
+
+  if (enable_systrace_)
+    dict.SetBoolean(kEnableSystraceParam, true);
+  else
+    dict.SetBoolean(kEnableSystraceParam, false);
+
+  AddCategoryToDict(dict, kIncludedCategoriesParam, included_categories_);
+  AddCategoryToDict(dict, kDisabledCategoriesParam, disabled_categories_);
+  AddCategoryToDict(dict, kExcludedCategoriesParam, excluded_categories_);
+  AddCategoryToDict(dict, kSyntheticDelaysParam, synthetic_delays_);
+}
+
+std::string TraceConfig::ToString() const {
+  base::DictionaryValue dict;
+  ToDict(dict);
+
+  std::string json;
+  base::JSONWriter::Write(dict, &json);
+
+  return json;
+}
+
+std::string TraceConfig::ToCategoryFilterString() const {
+  CategoryFilter cf;
+  cf.config_ = *this;
+  return cf.ToString();
+}
+
+std::string TraceConfig::ToTraceOptionsString() const {
+  TraceOptions to;
+  to.record_mode = record_mode_;
+  to.enable_sampling = enable_sampling_;
+  to.enable_systrace = enable_systrace_;
+  return to.ToString();
+}
+
+void TraceConfig::AddCategoryToDict(base::DictionaryValue& dict,
+                                    const char* param,
+                                    const StringList& categories) const {
+  if (categories.empty())
+    return;
+
+  scoped_ptr<base::ListValue> list(new base::ListValue());
+  for (StringList::const_iterator ci = categories.begin();
+       ci != categories.end();
+       ++ci) {
+    list->AppendString(*ci);
+  }
+
+  dict.Set(param, list.Pass());
+}
+
+void TraceConfig::Merge(const TraceConfig& config) {
+  if (record_mode_ != config.record_mode_
+      || enable_sampling_ != config.enable_sampling_
+      || enable_systrace_ != config.enable_systrace_) {
+    DLOG(ERROR) << "Attempting to merge trace config with a different "
+                << "set of options.";
+  }
+
+  // Keep included patterns only if both filters have an included entry.
+  // Otherwise, one of the filter was specifying "*" and we want to honor the
+  // broadest filter.
+  if (HasIncludedPatterns() && config.HasIncludedPatterns()) {
+    included_categories_.insert(included_categories_.end(),
+                                config.included_categories_.begin(),
+                                config.included_categories_.end());
+  } else {
+    included_categories_.clear();
+  }
+
+  disabled_categories_.insert(disabled_categories_.end(),
+                              config.disabled_categories_.begin(),
+                              config.disabled_categories_.end());
+  excluded_categories_.insert(excluded_categories_.end(),
+                              config.excluded_categories_.begin(),
+                              config.excluded_categories_.end());
+  synthetic_delays_.insert(synthetic_delays_.end(),
+                           config.synthetic_delays_.begin(),
+                           config.synthetic_delays_.end());
+}
+
+void TraceConfig::Clear() {
+  record_mode_ = RECORD_UNTIL_FULL;
+  enable_sampling_ = false;
+  enable_systrace_ = false;
+  included_categories_.clear();
+  disabled_categories_.clear();
+  excluded_categories_.clear();
+  synthetic_delays_.clear();
+}
+
+void TraceConfig::SetCategoriesFromList(StringList& categories,
+                                        const base::ListValue& list) {
+  categories.clear();
+  for (size_t i = 0; i < list.GetSize(); ++i) {
+    std::string category;
+    if (list.GetString(i, &category))
+      categories.push_back(category);
+  }
+}
+
+void TraceConfig::SetSyntheticDelaysFromList(StringList& delays,
+                                             const base::ListValue& list) {
+  delays.clear();
+  for (size_t i = 0; i < list.GetSize(); ++i) {
+    std::string delay;
+    if (!list.GetString(i, &delay))
+      continue;
+    // Synthetic delays are of the form "delay;option;option;...".
+    size_t name_length = delay.find(';');
+    if (name_length != std::string::npos && name_length > 0 &&
+        name_length != delay.size() - 1) {
+      delays.push_back(delay);
+    }
+  }
+}
+
+bool TraceConfig::IsCategoryGroupEnabled(
+    const char* category_group_name) const {
+  // TraceLog should call this method only as  part of enabling/disabling
+  // categories.
+
+  bool had_enabled_by_default = false;
+  DCHECK(category_group_name);
+  CStringTokenizer category_group_tokens(
+      category_group_name, category_group_name + strlen(category_group_name),
+      ",");
+  while (category_group_tokens.GetNext()) {
+    std::string category_group_token = category_group_tokens.token();
+    // Don't allow empty tokens, nor tokens with leading or trailing space.
+    DCHECK(!TraceConfig::IsEmptyOrContainsLeadingOrTrailingWhitespace(
+               category_group_token))
+        << "Disallowed category string";
+    if (IsCategoryEnabled(category_group_token.c_str())) {
+      return true;
+    }
+    if (!MatchPattern(category_group_token.c_str(),
+                      TRACE_DISABLED_BY_DEFAULT("*")))
+      had_enabled_by_default = true;
+  }
+  // Do a second pass to check for explicitly disabled categories
+  // (those explicitly enabled have priority due to first pass).
+  category_group_tokens.Reset();
+  bool category_group_disabled = false;
+  while (category_group_tokens.GetNext()) {
+    std::string category_group_token = category_group_tokens.token();
+    for (StringList::const_iterator ci = excluded_categories_.begin();
+         ci != excluded_categories_.end();
+         ++ci) {
+      if (MatchPattern(category_group_token.c_str(), ci->c_str())) {
+        // Current token of category_group_name is present in excluded_list.
+        // Flag the exclusion and proceed further to check if any of the
+        // remaining categories of category_group_name is not present in the
+        // excluded_ list.
+        category_group_disabled = true;
+        break;
+      }
+      // One of the category of category_group_name is not present in
+      // excluded_ list. So, it has to be included_ list. Enable the
+      // category_group_name for recording.
+      category_group_disabled = false;
+    }
+    // One of the categories present in category_group_name is not present in
+    // excluded_ list. Implies this category_group_name group can be enabled
+    // for recording, since one of its groups is enabled for recording.
+    if (!category_group_disabled)
+      break;
+  }
+  // If the category group is not excluded, and there are no included patterns
+  // we consider this category group enabled, as long as it had categories
+  // other than disabled-by-default.
+  return !category_group_disabled &&
+         included_categories_.empty() && had_enabled_by_default;
+}
+
+bool TraceConfig::IsCategoryEnabled(const char* category_name) const {
+  StringList::const_iterator ci;
+
+  // Check the disabled- filters and the disabled-* wildcard first so that a
+  // "*" filter does not include the disabled.
+  for (ci = disabled_categories_.begin();
+       ci != disabled_categories_.end();
+       ++ci) {
+    if (MatchPattern(category_name, ci->c_str()))
+      return true;
+  }
+
+  if (MatchPattern(category_name, TRACE_DISABLED_BY_DEFAULT("*")))
+    return false;
+
+  for (ci = included_categories_.begin();
+       ci != included_categories_.end();
+       ++ci) {
+    if (MatchPattern(category_name, ci->c_str()))
+      return true;
+  }
+
+  return false;
+}
+
+bool TraceConfig::IsEmptyOrContainsLeadingOrTrailingWhitespace(
+    const std::string& str) {
+  return  str.empty() ||
+          str.at(0) == ' ' ||
+          str.at(str.length() - 1) == ' ';
+}
+
+bool TraceConfig::HasIncludedPatterns() const {
+  return !included_categories_.empty();
+}
+
+bool CategoryFilter::IsEmptyOrContainsLeadingOrTrailingWhitespace(
+    const std::string& str) {
+  return  TraceConfig::IsEmptyOrContainsLeadingOrTrailingWhitespace(str);
+}
+
+CategoryFilter::CategoryFilter(const std::string& filter_string)
+    : config_(TraceConfig(filter_string, "")) {
+}
+
+CategoryFilter::CategoryFilter()
+    : config_(TraceConfig()) {
+}
+
+CategoryFilter::CategoryFilter(const CategoryFilter& cf)
+    : config_(cf.config_) {
+}
+
+CategoryFilter::~CategoryFilter() {
+}
+
+CategoryFilter& CategoryFilter::operator=(const CategoryFilter& rhs) {
+  if (this == &rhs)
+    return *this;
+
+  config_ = rhs.config_;
+  return *this;
+}
+
+void CategoryFilter::WriteString(const StringList& values,
+                                 std::string* out,
+                                 bool included) const {
+  bool prepend_comma = !out->empty();
+  int token_cnt = 0;
+  for (StringList::const_iterator ci = values.begin();
+       ci != values.end(); ++ci) {
+    if (token_cnt > 0 || prepend_comma)
+      StringAppendF(out, ",");
+    StringAppendF(out, "%s%s", (included ? "" : "-"), ci->c_str());
+    ++token_cnt;
+  }
+}
+
+void CategoryFilter::WriteString(const StringList& delays,
+                                 std::string* out) const {
+  bool prepend_comma = !out->empty();
+  int token_cnt = 0;
+  for (StringList::const_iterator ci = delays.begin();
+       ci != delays.end(); ++ci) {
+    if (token_cnt > 0 || prepend_comma)
+      StringAppendF(out, ",");
+    StringAppendF(out, "%s%s)", kSyntheticDelayCategoryFilterPrefix,
+                  ci->c_str());
+    ++token_cnt;
+  }
+}
+
+std::string CategoryFilter::ToString() const {
+  std::string filter_string;
+  WriteString(config_.included_categories_, &filter_string, true);
+  WriteString(config_.disabled_categories_, &filter_string, true);
+  WriteString(config_.excluded_categories_, &filter_string, false);
+  WriteString(config_.synthetic_delays_, &filter_string);
+  return filter_string;
+}
+
+bool CategoryFilter::IsCategoryGroupEnabled(
+    const char* category_group_name) const {
+  return config_.IsCategoryGroupEnabled(category_group_name);
+}
+
+bool CategoryFilter::IsCategoryEnabled(const char* category_name) const {
+  return config_.IsCategoryEnabled(category_name);
+}
+
+bool CategoryFilter::HasIncludedPatterns() const {
+  return config_.HasIncludedPatterns();
+}
+
+void CategoryFilter::Merge(const CategoryFilter& nested_filter) {
+  config_.Merge(nested_filter.config_);
+}
+
+void CategoryFilter::Clear() {
+  config_.included_categories_.clear();
+  config_.disabled_categories_.clear();
+  config_.excluded_categories_.clear();
+}
+
+const CategoryFilter::StringList&
+    CategoryFilter::GetSyntheticDelayValues() const {
+  return config_.GetSyntheticDelayValues();
+}
+
+}  // namespace trace_event
+}  // namespace base