Split the IPC code into ipc/

This splits the ipc code from the common project.  The 'common' project pulls in
all of webkit, the v8 bindings, skia, googleurl, and a number of other projects
which makes it very difficult to deal with especially for external projects
wanting just to use some of Chromium's infrastructure.  This puts the ipc code
into its top-level ipc/ directory with a dependency only on base.  The common
project depends on the new ipc/ipc.gyp:ipc target so that all projects currently
pulling common in to get the IPC code still have it available.  This mostly
follows agl's pre-gyp attempt to do this which was r13062.

Known issues:
- Currently a number of projects depend on chrome/chrome.gyp:common in order to
use the IPC infrastructure.  Rather than fixing all of these dependencies I have
made common depend on ipc/ipc.gyp:ipc and added "ipc" to the include_rules
section of DEPS so that checkdeps.py doesn't complain.  Over time projects that
need IPC should depend on the IPC project themselves and dependencies on common
removed, although I don't think many projects that need IPC will be able to get
away without common currently.
- ipc/ipc_message_macros.h still has #include "chrome/common/..." inside of a
ipc/ should not refer to files in chrome/... now.  I'm not sure how to resolve
this since it's really an IDE bug
- the named pipe name (windows+linux) and the logging event name (all) + env
variable (posix) refer explicitly to 'Chrome' which somewhat hurts the illusion
of ipc/ being an independent library.  I think this should be examined in a
subsequent, much smaller patch.
- I've eliminated the IPC.SendMsgCount counter since it was implemented in a way
to create a dependency from ipc/ to chrome/common/chrome_counters. This is the
same approach that r13062 took.

http://codereview.chromium.org/155905

(Patch from James Robinson)


git-svn-id: svn://svn.chromium.org/chrome/trunk/src@21342 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 235 insertions, 0 deletions

diff --git a/ipc/ipc_message_utils.cc b/ipc/ipc_message_utils.cc
new file mode 100644
index 0000000..ac188bf
--- /dev/null
+++ b/ipc/ipc_message_utils.cc
@@ -0,0 +1,235 @@
+// Copyright (c) 2006-2008 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 "ipc/ipc_message_utils.h"
+
+#include "base/json_writer.h"
+#include "base/scoped_ptr.h"
+#include "base/time.h"
+#include "base/values.h"
+
+namespace IPC {
+
+const int kMaxRecursionDepth = 100;
+
+// Value serialization
+
+static bool ReadValue(const Message* m, void** iter, Value** value,
+                      int recursion);
+
+static void WriteValue(Message* m, const Value* value, int recursion) {
+  if (recursion > kMaxRecursionDepth) {
+    LOG(WARNING) << "Max recursion depth hit in WriteValue.";
+    return;
+  }
+
+  m->WriteInt(value->GetType());
+
+  switch (value->GetType()) {
+  case Value::TYPE_NULL:
+    break;
+  case Value::TYPE_BOOLEAN: {
+      bool val;
+      value->GetAsBoolean(&val);
+      WriteParam(m, val);
+      break;
+    }
+  case Value::TYPE_INTEGER: {
+      int val;
+      value->GetAsInteger(&val);
+      WriteParam(m, val);
+      break;
+    }
+  case Value::TYPE_REAL: {
+      double val;
+      value->GetAsReal(&val);
+      WriteParam(m, val);
+      break;
+    }
+  case Value::TYPE_STRING: {
+      std::string val;
+      value->GetAsString(&val);
+      WriteParam(m, val);
+      break;
+    }
+  case Value::TYPE_BINARY: {
+      NOTREACHED() << "Don't send BinaryValues over IPC.";
+    }
+  case Value::TYPE_DICTIONARY: {
+      const DictionaryValue* dict = static_cast<const DictionaryValue*>(value);
+
+      WriteParam(m, static_cast<int>(dict->GetSize()));
+
+      for (DictionaryValue::key_iterator it = dict->begin_keys();
+           it != dict->end_keys(); ++it) {
+        Value* subval;
+        if (dict->Get(*it, &subval)) {
+          WriteParam(m, *it);
+          WriteValue(m, subval, recursion + 1);
+        } else {
+          NOTREACHED() << "DictionaryValue iterators are filthy liars.";
+        }
+      }
+      break;
+    }
+  case Value::TYPE_LIST: {
+      const ListValue* list = static_cast<const ListValue*>(value);
+      WriteParam(m, static_cast<int>(list->GetSize()));
+      for (size_t i = 0; i < list->GetSize(); ++i) {
+        Value* subval;
+        if (list->Get(i, &subval)) {
+          WriteValue(m, subval, recursion + 1);
+        } else {
+          NOTREACHED() << "ListValue::GetSize is a filthy liar.";
+        }
+      }
+      break;
+    }
+  }
+}
+
+// Helper for ReadValue that reads a DictionaryValue into a pre-allocated
+// object.
+static bool ReadDictionaryValue(const Message* m, void** iter,
+                                DictionaryValue* value, int recursion) {
+  int size;
+  if (!ReadParam(m, iter, &size))
+    return false;
+
+  for (int i = 0; i < size; ++i) {
+    std::wstring key;
+    Value* subval;
+    if (!ReadParam(m, iter, &key) ||
+        !ReadValue(m, iter, &subval, recursion + 1))
+      return false;
+    value->Set(key, subval);
+  }
+
+  return true;
+}
+
+// Helper for ReadValue that reads a ReadListValue into a pre-allocated
+// object.
+static bool ReadListValue(const Message* m, void** iter,
+                          ListValue* value, int recursion) {
+  int size;
+  if (!ReadParam(m, iter, &size))
+    return false;
+
+  for (int i = 0; i < size; ++i) {
+    Value* subval;
+    if (!ReadValue(m, iter, &subval, recursion + 1))
+      return false;
+    value->Set(i, subval);
+  }
+
+  return true;
+}
+
+static bool ReadValue(const Message* m, void** iter, Value** value,
+                      int recursion) {
+  if (recursion > kMaxRecursionDepth) {
+    LOG(WARNING) << "Max recursion depth hit in ReadValue.";
+    return false;
+  }
+
+  int type;
+  if (!ReadParam(m, iter, &type))
+    return false;
+
+  switch (type) {
+  case Value::TYPE_NULL:
+    *value = Value::CreateNullValue();
+    break;
+  case Value::TYPE_BOOLEAN: {
+      bool val;
+      if (!ReadParam(m, iter, &val))
+        return false;
+      *value = Value::CreateBooleanValue(val);
+      break;
+    }
+  case Value::TYPE_INTEGER: {
+      int val;
+      if (!ReadParam(m, iter, &val))
+        return false;
+      *value = Value::CreateIntegerValue(val);
+      break;
+    }
+  case Value::TYPE_REAL: {
+      double val;
+      if (!ReadParam(m, iter, &val))
+        return false;
+      *value = Value::CreateRealValue(val);
+      break;
+    }
+  case Value::TYPE_STRING: {
+      std::string val;
+      if (!ReadParam(m, iter, &val))
+        return false;
+      *value = Value::CreateStringValue(val);
+      break;
+    }
+  case Value::TYPE_BINARY: {
+      NOTREACHED() << "Don't send BinaryValues over IPC.";
+      break;
+    }
+  case Value::TYPE_DICTIONARY: {
+      scoped_ptr<DictionaryValue> val(new DictionaryValue());
+      if (!ReadDictionaryValue(m, iter, val.get(), recursion))
+        return false;
+      *value = val.release();
+      break;
+    }
+  case Value::TYPE_LIST: {
+      scoped_ptr<ListValue> val(new ListValue());
+      if (!ReadListValue(m, iter, val.get(), recursion))
+        return false;
+      *value = val.release();
+      break;
+    }
+  default:
+    return false;
+  }
+
+  return true;
+}
+
+void ParamTraits<DictionaryValue>::Write(Message* m, const param_type& p) {
+  WriteValue(m, &p, 0);
+}
+
+bool ParamTraits<DictionaryValue>::Read(
+    const Message* m, void** iter, param_type* r) {
+  int type;
+  if (!ReadParam(m, iter, &type) || type != Value::TYPE_DICTIONARY)
+    return false;
+
+  return ReadDictionaryValue(m, iter, r, 0);
+}
+
+void ParamTraits<DictionaryValue>::Log(const param_type& p, std::wstring* l) {
+  std::string json;
+  JSONWriter::Write(&p, false, &json);
+  l->append(UTF8ToWide(json));
+}
+
+void ParamTraits<ListValue>::Write(Message* m, const param_type& p) {
+  WriteValue(m, &p, 0);
+}
+
+bool ParamTraits<ListValue>::Read(
+    const Message* m, void** iter, param_type* r) {
+  int type;
+  if (!ReadParam(m, iter, &type) || type != Value::TYPE_LIST)
+    return false;
+
+  return ReadListValue(m, iter, r, 0);
+}
+
+void ParamTraits<ListValue>::Log(const param_type& p, std::wstring* l) {
+  std::string json;
+  JSONWriter::Write(&p, false, &json);
+  l->append(UTF8ToWide(json));
+}
+}  // namespace IPC