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fbb68dbcd0
In essence, namespace behaviors acted as hooks for update operations on namespaces. Two behaviors were implemented: - `NamespaceBehavior`: allows the update operation unless it acts on a value that itself was explicitly marked as constant. - `ConstNamespaceBehavior`: initially allows insert operations but marks the individual values as const. Additionally provides a `Freeze()` member function. After this was called, updates are rejected unless a special `overrideFrozen` flag is set explicitly. This marvel of object-oriented programming can be replaced with a simple bool. This commit basically replaces `Namespace::m_Behavior` with `Namespace::m_ConstValues` and inlines the behavior functions where they were called. While doing so, the code was slightly simplified by assuming that `m_ConstValues` is true if `m_Frozen` is true. This is similar to what the API allowed in the old code as you could only freeze a `ConstNamespaceBehavior`. However, this PR moves the `Freeze()` member function and the related `m_Freeze` member variable to the `Namespace` class. So now the API allows any namespace to be frozen. The new code also makes sense with the previously mentioned simplification: a `Namespace` with `m_ConstValues = false` can be modified without restrictions until `Freeze()` is called. When this is done, it becomes read-only. The changes outside of `namespace.*` just adapt the code to the slightly changed API.
128 lines
3.0 KiB
C++
128 lines
3.0 KiB
C++
/* Icinga 2 | (c) 2012 Icinga GmbH | GPLv2+ */
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#include "base/scriptframe.hpp"
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#include "base/scriptglobal.hpp"
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#include "base/namespace.hpp"
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#include "base/exception.hpp"
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#include "base/configuration.hpp"
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using namespace icinga;
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boost::thread_specific_ptr<std::stack<ScriptFrame *> > ScriptFrame::m_ScriptFrames;
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static Namespace::Ptr l_InternalNS;
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/* Ensure that this gets called with highest priority
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* and wins against other static initializers in lib/icinga, etc.
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* LTO-enabled builds will cause trouble otherwise, see GH #6575.
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*/
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INITIALIZE_ONCE_WITH_PRIORITY([]() {
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Namespace::Ptr globalNS = ScriptGlobal::GetGlobals();
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Namespace::Ptr systemNS = new Namespace(true);
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systemNS->Freeze();
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globalNS->SetAttribute("System", new ConstEmbeddedNamespaceValue(systemNS));
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systemNS->SetAttribute("Configuration", new EmbeddedNamespaceValue(new Configuration()));
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Namespace::Ptr typesNS = new Namespace(true);
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typesNS->Freeze();
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globalNS->SetAttribute("Types", new ConstEmbeddedNamespaceValue(typesNS));
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Namespace::Ptr statsNS = new Namespace(true);
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statsNS->Freeze();
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globalNS->SetAttribute("StatsFunctions", new ConstEmbeddedNamespaceValue(statsNS));
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l_InternalNS = new Namespace(true);
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globalNS->SetAttribute("Internal", new ConstEmbeddedNamespaceValue(l_InternalNS));
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}, 1000);
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INITIALIZE_ONCE_WITH_PRIORITY([]() {
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l_InternalNS->Freeze();
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}, 0);
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ScriptFrame::ScriptFrame(bool allocLocals)
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: Locals(allocLocals ? new Dictionary() : nullptr), Self(ScriptGlobal::GetGlobals()), Sandboxed(false), Depth(0)
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{
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InitializeFrame();
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}
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ScriptFrame::ScriptFrame(bool allocLocals, Value self)
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: Locals(allocLocals ? new Dictionary() : nullptr), Self(std::move(self)), Sandboxed(false), Depth(0)
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{
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InitializeFrame();
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}
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void ScriptFrame::InitializeFrame()
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{
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std::stack<ScriptFrame *> *frames = m_ScriptFrames.get();
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if (frames && !frames->empty()) {
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ScriptFrame *frame = frames->top();
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Sandboxed = frame->Sandboxed;
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}
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PushFrame(this);
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}
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ScriptFrame::~ScriptFrame()
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{
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ScriptFrame *frame = PopFrame();
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ASSERT(frame == this);
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#ifndef I2_DEBUG
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(void)frame;
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#endif /* I2_DEBUG */
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}
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void ScriptFrame::IncreaseStackDepth()
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{
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if (Depth + 1 > 300)
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BOOST_THROW_EXCEPTION(ScriptError("Stack overflow while evaluating expression: Recursion level too deep."));
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Depth++;
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}
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void ScriptFrame::DecreaseStackDepth()
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{
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Depth--;
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}
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ScriptFrame *ScriptFrame::GetCurrentFrame()
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{
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std::stack<ScriptFrame *> *frames = m_ScriptFrames.get();
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ASSERT(!frames->empty());
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return frames->top();
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}
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ScriptFrame *ScriptFrame::PopFrame()
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{
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std::stack<ScriptFrame *> *frames = m_ScriptFrames.get();
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ASSERT(!frames->empty());
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ScriptFrame *frame = frames->top();
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frames->pop();
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return frame;
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}
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void ScriptFrame::PushFrame(ScriptFrame *frame)
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{
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std::stack<ScriptFrame *> *frames = m_ScriptFrames.get();
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if (!frames) {
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frames = new std::stack<ScriptFrame *>();
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m_ScriptFrames.reset(frames);
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}
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if (!frames->empty()) {
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ScriptFrame *parent = frames->top();
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frame->Depth += parent->Depth;
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}
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frames->push(frame);
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}
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