NetLogEventParameter to Callback refactoring 7.

net/proxy/proxy_script_decider.cc

 // Copyright (c) 2012 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 "net/proxy/proxy_script_decider.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/compiler_specific.h"
 #include "base/format_macros.h"
 #include "base/logging.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
-#include "net/base/net_log.h"
+#include "base/values.h"
 #include "net/base/net_errors.h"
 #include "net/proxy/dhcp_proxy_script_fetcher.h"
 #include "net/proxy/dhcp_proxy_script_fetcher_factory.h"
 #include "net/proxy/proxy_script_fetcher.h"
 
 namespace net {
 
 namespace {
+
 bool LooksLikePacScript(const string16& script) {
   // Note: this is only an approximation! It may not always work correctly,
   // however it is very likely that legitimate scripts have this exact string,
   // since they must minimally define a function of this name. Conversely, a
   // file not containing the string is not likely to be a PAC script.
   //
   // An exact test would have to load the script in a javascript evaluator.
   return script.find(ASCIIToUTF16("FindProxyForURL")) != string16::npos;
 }
+
 }
 
 // This is the hard-coded location used by the DNS portion of web proxy
 // auto-discovery.
 //
 // Note that we not use DNS devolution to find the WPAD host, since that could
 // be dangerous should our top level domain registry  become out of date.
 //
 // Instead we directly resolve "wpad", and let the operating system apply the
 // DNS suffix search paths. This is the same approach taken by Firefox, and
 // compatibility hasn't been an issue.
 //
 // For more details, also check out this comment:
 // http://code.google.com/p/chromium/issues/detail?id=18575#c20
 static const char kWpadUrl[] = "http://wpad/wpad.dat";
 
+Value* ProxyScriptDecider::PacSource::NetLogCallback(
+    const GURL* effective_pac_url,
+    NetLog::LogLevel /* log_level */) const {
+  DictionaryValue* dict = new DictionaryValue();
+  std::string source;
+  switch (type) {
+    case PacSource::WPAD_DHCP:
+      source = "WPAD DHCP";
+      break;
+    case PacSource::WPAD_DNS:
+      source = "WPAD DNS: ";
+      source += effective_pac_url->possibly_invalid_spec();
+      break;
+    case PacSource::CUSTOM:
+      source = "Custom PAC URL: ";
+      source += effective_pac_url->possibly_invalid_spec();
+      break;
+  }
+  dict->SetString("source", source);
+  return dict;
+}
+
 ProxyScriptDecider::ProxyScriptDecider(
     ProxyScriptFetcher* proxy_script_fetcher,
     DhcpProxyScriptFetcher* dhcp_proxy_script_fetcher,
     NetLog* net_log)
     : resolver_(NULL),
       proxy_script_fetcher_(proxy_script_fetcher),
       dhcp_proxy_script_fetcher_(dhcp_proxy_script_fetcher),
       current_pac_source_index_(0u),
       pac_mandatory_(false),
       next_state_(STATE_NONE),
       net_log_(BoundNetLog::Make(
           net_log, NetLog::SOURCE_PROXY_SCRIPT_DECIDER)),
       fetch_pac_bytes_(false) {
 }
 
 ProxyScriptDecider::~ProxyScriptDecider() {
   if (next_state_ != STATE_NONE)
     Cancel();
 }
 
 int ProxyScriptDecider::Start(
     const ProxyConfig& config, const base::TimeDelta wait_delay,
     bool fetch_pac_bytes, const CompletionCallback& callback) {
   DCHECK_EQ(STATE_NONE, next_state_);
   DCHECK(!callback.is_null());
   DCHECK(config.HasAutomaticSettings());
 
-  net_log_.BeginEvent(NetLog::TYPE_PROXY_SCRIPT_DECIDER, NULL);
+  net_log_.BeginEvent(NetLog::TYPE_PROXY_SCRIPT_DECIDER);
 
   fetch_pac_bytes_ = fetch_pac_bytes;
 
   // Save the |wait_delay| as a non-negative value.
   wait_delay_ = wait_delay;
   if (wait_delay_ < base::TimeDelta())
     wait_delay_ = base::TimeDelta();
 
   pac_mandatory_ = config.pac_mandatory();
 
@@ skipping 94 matching lines @@
 int ProxyScriptDecider::DoWait() {
   next_state_ = STATE_WAIT_COMPLETE;
 
   // If no waiting is required, continue on to the next state.
   if (wait_delay_.ToInternalValue() == 0)
     return OK;
 
   // Otherwise wait the specified amount of time.
   wait_timer_.Start(FROM_HERE, wait_delay_, this,
                     &ProxyScriptDecider::OnWaitTimerFired);
-  net_log_.BeginEvent(NetLog::TYPE_PROXY_SCRIPT_DECIDER_WAIT, NULL);
+  net_log_.BeginEvent(NetLog::TYPE_PROXY_SCRIPT_DECIDER_WAIT);
   return ERR_IO_PENDING;
 }
 
 int ProxyScriptDecider::DoWaitComplete(int result) {
   DCHECK_EQ(OK, result);
   if (wait_delay_.ToInternalValue() != 0) {
     net_log_.EndEventWithNetErrorCode(NetLog::TYPE_PROXY_SCRIPT_DECIDER_WAIT,
                                       result);
   }
   next_state_ = GetStartState();
   return OK;
 }
 
 int ProxyScriptDecider::DoFetchPacScript() {
   DCHECK(fetch_pac_bytes_);
 
   next_state_ = STATE_FETCH_PAC_SCRIPT_COMPLETE;
 
   const PacSource& pac_source = current_pac_source();
 
   GURL effective_pac_url;
-  NetLogStringParameter* log_parameter =
-      CreateNetLogParameterAndDetermineURL(pac_source, &effective_pac_url);
+  DetermineURL(pac_source, &effective_pac_url);
 
-  net_log_.BeginEvent(
-      NetLog::TYPE_PROXY_SCRIPT_DECIDER_FETCH_PAC_SCRIPT,
-      make_scoped_refptr(log_parameter));
+  net_log_.BeginEvent(NetLog::TYPE_PROXY_SCRIPT_DECIDER_FETCH_PAC_SCRIPT,
+                      base::Bind(&PacSource::NetLogCallback,
+                                 base::Unretained(&pac_source),
+                                 &effective_pac_url));
 
   if (pac_source.type == PacSource::WPAD_DHCP) {
     if (!dhcp_proxy_script_fetcher_) {
-      net_log_.AddEvent(NetLog::TYPE_PROXY_SCRIPT_DECIDER_HAS_NO_FETCHER, NULL);
+      net_log_.AddEvent(NetLog::TYPE_PROXY_SCRIPT_DECIDER_HAS_NO_FETCHER);
       return ERR_UNEXPECTED;
     }
 
     return dhcp_proxy_script_fetcher_->Fetch(
         &pac_script_, base::Bind(&ProxyScriptDecider::OnIOCompletion,
                                  base::Unretained(this)));
   }
 
   if (!proxy_script_fetcher_) {
-    net_log_.AddEvent(NetLog::TYPE_PROXY_SCRIPT_DECIDER_HAS_NO_FETCHER, NULL);
+    net_log_.AddEvent(NetLog::TYPE_PROXY_SCRIPT_DECIDER_HAS_NO_FETCHER);
     return ERR_UNEXPECTED;
   }
 
   return proxy_script_fetcher_->Fetch(
       effective_pac_url, &pac_script_,
       base::Bind(&ProxyScriptDecider::OnIOCompletion, base::Unretained(this)));
 }
 
 int ProxyScriptDecider::DoFetchPacScriptComplete(int result) {
   DCHECK(fetch_pac_bytes_);
@@ skipping 73 matching lines @@
 
   if (current_pac_source_index_ + 1 >= pac_sources_.size()) {
     // Nothing left to fall back to.
     return error;
   }
 
   // Advance to next URL in our list.
   ++current_pac_source_index_;
 
   net_log_.AddEvent(
-      NetLog::TYPE_PROXY_SCRIPT_DECIDER_FALLING_BACK_TO_NEXT_PAC_SOURCE, NULL);
+      NetLog::TYPE_PROXY_SCRIPT_DECIDER_FALLING_BACK_TO_NEXT_PAC_SOURCE);
 
   next_state_ = GetStartState();
 
   return OK;
 }
 
 ProxyScriptDecider::State ProxyScriptDecider::GetStartState() const {
   return fetch_pac_bytes_ ?  STATE_FETCH_PAC_SCRIPT : STATE_VERIFY_PAC_SCRIPT;
 }
 
-NetLogStringParameter* ProxyScriptDecider::CreateNetLogParameterAndDetermineURL(
-    const PacSource& pac_source,
-    GURL* effective_pac_url) {
+void ProxyScriptDecider::DetermineURL(const PacSource& pac_source,
+                                      GURL* effective_pac_url) {
   DCHECK(effective_pac_url);
 
-  std::string source_field;
   switch (pac_source.type) {
     case PacSource::WPAD_DHCP:
-      source_field = "WPAD DHCP";
       break;
     case PacSource::WPAD_DNS:
       *effective_pac_url = GURL(kWpadUrl);
-      source_field = "WPAD DNS: ";
-      source_field += effective_pac_url->possibly_invalid_spec();
       break;
     case PacSource::CUSTOM:
       *effective_pac_url = pac_source.url;
-      source_field = "Custom PAC URL: ";
-      source_field += effective_pac_url->possibly_invalid_spec();
       break;
   }
-  return new NetLogStringParameter("source", source_field);
 }
 
 const ProxyScriptDecider::PacSource&
     ProxyScriptDecider::current_pac_source() const {
   DCHECK_LT(current_pac_source_index_, pac_sources_.size());
   return pac_sources_[current_pac_source_index_];
 }
 
 void ProxyScriptDecider::OnWaitTimerFired() {
   OnIOCompletion(OK);
 }
 
 void ProxyScriptDecider::DidComplete() {
-  net_log_.EndEvent(NetLog::TYPE_PROXY_SCRIPT_DECIDER, NULL);
+  net_log_.EndEvent(NetLog::TYPE_PROXY_SCRIPT_DECIDER);
 }
 
 void ProxyScriptDecider::Cancel() {
   DCHECK_NE(STATE_NONE, next_state_);
 
-  net_log_.AddEvent(NetLog::TYPE_CANCELLED, NULL);
+  net_log_.AddEvent(NetLog::TYPE_CANCELLED);
 
   switch (next_state_) {
     case STATE_WAIT_COMPLETE:
       wait_timer_.Stop();
       break;
     case STATE_FETCH_PAC_SCRIPT_COMPLETE:
       proxy_script_fetcher_->Cancel();
       break;
     default:
       NOTREACHED();
       break;
   }
 
   // This is safe to call in any state.
   if (dhcp_proxy_script_fetcher_)
     dhcp_proxy_script_fetcher_->Cancel();
 
   DidComplete();
 }
 
 }  // namespace net