390 lines
9.5 KiB
C++
390 lines
9.5 KiB
C++
/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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file Copyright.txt or https://cmake.org/licensing for details. */
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#include "cmFileMonitor.h"
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#include <cmsys/SystemTools.hxx>
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#include <cassert>
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#include <iostream>
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#include <set>
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#include <unordered_map>
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namespace {
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void on_directory_change(uv_fs_event_t* handle, const char* filename,
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int events, int status);
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void on_fs_close(uv_handle_t* handle);
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} // namespace
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class cmIBaseWatcher
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{
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public:
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cmIBaseWatcher() = default;
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virtual ~cmIBaseWatcher() = default;
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virtual void Trigger(const std::string& pathSegment, int events,
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int status) const = 0;
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virtual std::string Path() const = 0;
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virtual uv_loop_t* Loop() const = 0;
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virtual void StartWatching() = 0;
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virtual void StopWatching() = 0;
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virtual std::vector<std::string> WatchedFiles() const = 0;
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virtual std::vector<std::string> WatchedDirectories() const = 0;
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};
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class cmVirtualDirectoryWatcher : public cmIBaseWatcher
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{
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public:
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~cmVirtualDirectoryWatcher()
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{
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for (auto i : this->Children) {
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delete i.second;
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}
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}
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cmIBaseWatcher* Find(const std::string& ps)
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{
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const auto i = this->Children.find(ps);
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return (i == this->Children.end()) ? nullptr : i->second;
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}
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void Trigger(const std::string& pathSegment, int events,
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int status) const final
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{
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if (pathSegment.empty()) {
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for (const auto& i : this->Children) {
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i.second->Trigger(std::string(), events, status);
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}
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} else {
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const auto i = this->Children.find(pathSegment);
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if (i != this->Children.end()) {
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i->second->Trigger(std::string(), events, status);
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}
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}
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}
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void StartWatching() override
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{
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for (const auto& i : this->Children) {
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i.second->StartWatching();
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}
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}
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void StopWatching() override
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{
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for (const auto& i : this->Children) {
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i.second->StopWatching();
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}
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}
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std::vector<std::string> WatchedFiles() const final
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{
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std::vector<std::string> result;
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for (const auto& i : this->Children) {
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for (const auto& j : i.second->WatchedFiles()) {
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result.push_back(j);
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}
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}
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return result;
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}
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std::vector<std::string> WatchedDirectories() const override
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{
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std::vector<std::string> result;
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for (const auto& i : this->Children) {
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for (const auto& j : i.second->WatchedDirectories()) {
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result.push_back(j);
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}
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}
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return result;
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}
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void Reset()
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{
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for (auto c : this->Children) {
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delete c.second;
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}
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this->Children.clear();
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}
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void AddChildWatcher(const std::string& ps, cmIBaseWatcher* watcher)
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{
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assert(!ps.empty());
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assert(this->Children.find(ps) == this->Children.end());
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assert(watcher);
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this->Children.emplace(std::make_pair(ps, watcher));
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}
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private:
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std::unordered_map<std::string, cmIBaseWatcher*> Children; // owned!
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};
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// Root of all the different (on windows!) root directories:
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class cmRootWatcher : public cmVirtualDirectoryWatcher
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{
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public:
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cmRootWatcher(uv_loop_t* loop)
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: mLoop(loop)
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{
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assert(loop);
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}
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std::string Path() const final
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{
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assert(false);
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return std::string();
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}
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uv_loop_t* Loop() const final { return this->mLoop; }
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private:
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uv_loop_t* const mLoop; // no ownership!
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};
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// Real directories:
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class cmRealDirectoryWatcher : public cmVirtualDirectoryWatcher
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{
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public:
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cmRealDirectoryWatcher(cmVirtualDirectoryWatcher* p, const std::string& ps)
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: Parent(p)
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, PathSegment(ps)
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{
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assert(p);
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assert(!ps.empty());
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p->AddChildWatcher(ps, this);
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}
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~cmRealDirectoryWatcher()
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{
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// Handle is freed via uv_handle_close callback!
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}
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void StartWatching() final
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{
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if (!this->Handle) {
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this->Handle = new uv_fs_event_t;
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uv_fs_event_init(this->Loop(), this->Handle);
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this->Handle->data = this;
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uv_fs_event_start(this->Handle, &on_directory_change, Path().c_str(), 0);
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}
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cmVirtualDirectoryWatcher::StartWatching();
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}
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void StopWatching() final
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{
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if (this->Handle) {
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uv_fs_event_stop(this->Handle);
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uv_close(reinterpret_cast<uv_handle_t*>(this->Handle), &on_fs_close);
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this->Handle = nullptr;
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}
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cmVirtualDirectoryWatcher::StopWatching();
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}
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uv_loop_t* Loop() const final { return this->Parent->Loop(); }
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std::vector<std::string> WatchedDirectories() const override
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{
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std::vector<std::string> result = { Path() };
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for (const auto& j : cmVirtualDirectoryWatcher::WatchedDirectories()) {
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result.push_back(j);
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}
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return result;
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}
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protected:
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cmVirtualDirectoryWatcher* const Parent;
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const std::string PathSegment;
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private:
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uv_fs_event_t* Handle = nullptr; // owner!
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};
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// Root directories:
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class cmRootDirectoryWatcher : public cmRealDirectoryWatcher
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{
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public:
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cmRootDirectoryWatcher(cmRootWatcher* p, const std::string& ps)
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: cmRealDirectoryWatcher(p, ps)
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{
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}
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std::string Path() const final { return this->PathSegment; }
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};
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// Normal directories below root:
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class cmDirectoryWatcher : public cmRealDirectoryWatcher
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{
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public:
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cmDirectoryWatcher(cmRealDirectoryWatcher* p, const std::string& ps)
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: cmRealDirectoryWatcher(p, ps)
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{
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}
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std::string Path() const final
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{
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return this->Parent->Path() + this->PathSegment + "/";
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}
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};
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class cmFileWatcher : public cmIBaseWatcher
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{
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public:
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cmFileWatcher(cmRealDirectoryWatcher* p, const std::string& ps,
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cmFileMonitor::Callback cb)
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: Parent(p)
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, PathSegment(ps)
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, CbList({ cb })
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{
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assert(p);
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assert(!ps.empty());
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p->AddChildWatcher(ps, this);
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}
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void StartWatching() final {}
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void StopWatching() final {}
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void AppendCallback(cmFileMonitor::Callback cb) { CbList.push_back(cb); }
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std::string Path() const final
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{
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return this->Parent->Path() + this->PathSegment;
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}
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std::vector<std::string> WatchedDirectories() const final { return {}; }
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std::vector<std::string> WatchedFiles() const final
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{
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return { this->Path() };
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}
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void Trigger(const std::string& ps, int events, int status) const final
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{
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assert(ps.empty());
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assert(status == 0);
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static_cast<void>(ps);
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const std::string path = this->Path();
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for (const auto& cb : this->CbList) {
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cb(path, events, status);
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}
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}
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uv_loop_t* Loop() const final { return this->Parent->Loop(); }
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private:
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cmRealDirectoryWatcher* Parent;
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const std::string PathSegment;
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std::vector<cmFileMonitor::Callback> CbList;
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};
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namespace {
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void on_directory_change(uv_fs_event_t* handle, const char* filename,
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int events, int status)
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{
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const cmIBaseWatcher* const watcher =
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static_cast<const cmIBaseWatcher*>(handle->data);
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const std::string pathSegment(filename);
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watcher->Trigger(pathSegment, events, status);
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}
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void on_fs_close(uv_handle_t* handle)
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{
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delete reinterpret_cast<uv_fs_event_t*>(handle);
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}
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} // namespace
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cmFileMonitor::cmFileMonitor(uv_loop_t* l)
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: Root(new cmRootWatcher(l))
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{
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}
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cmFileMonitor::~cmFileMonitor()
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{
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delete this->Root;
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}
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void cmFileMonitor::MonitorPaths(const std::vector<std::string>& paths,
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Callback cb)
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{
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for (const auto& p : paths) {
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std::vector<std::string> pathSegments;
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cmsys::SystemTools::SplitPath(p, pathSegments, true);
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const size_t segmentCount = pathSegments.size();
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if (segmentCount < 2) { // Expect at least rootdir and filename
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continue;
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}
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cmVirtualDirectoryWatcher* currentWatcher = this->Root;
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for (size_t i = 0; i < segmentCount; ++i) {
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assert(currentWatcher);
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const bool fileSegment = (i == segmentCount - 1);
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const bool rootSegment = (i == 0);
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assert(
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!(fileSegment &&
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rootSegment)); // Can not be both filename and root part of the path!
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const std::string& currentSegment = pathSegments[i];
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cmIBaseWatcher* nextWatcher = currentWatcher->Find(currentSegment);
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if (!nextWatcher) {
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if (rootSegment) { // Root part
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assert(currentWatcher == this->Root);
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nextWatcher = new cmRootDirectoryWatcher(this->Root, currentSegment);
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assert(currentWatcher->Find(currentSegment) == nextWatcher);
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} else if (fileSegment) { // File part
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assert(currentWatcher != this->Root);
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nextWatcher = new cmFileWatcher(
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dynamic_cast<cmRealDirectoryWatcher*>(currentWatcher),
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currentSegment, cb);
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assert(currentWatcher->Find(currentSegment) == nextWatcher);
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} else { // Any normal directory in between
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nextWatcher = new cmDirectoryWatcher(
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dynamic_cast<cmRealDirectoryWatcher*>(currentWatcher),
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currentSegment);
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assert(currentWatcher->Find(currentSegment) == nextWatcher);
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}
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} else {
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if (fileSegment) {
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auto filePtr = dynamic_cast<cmFileWatcher*>(nextWatcher);
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assert(filePtr);
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filePtr->AppendCallback(cb);
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continue;
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}
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}
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currentWatcher = dynamic_cast<cmVirtualDirectoryWatcher*>(nextWatcher);
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}
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}
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this->Root->StartWatching();
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}
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void cmFileMonitor::StopMonitoring()
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{
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this->Root->StopWatching();
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this->Root->Reset();
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}
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std::vector<std::string> cmFileMonitor::WatchedFiles() const
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{
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std::vector<std::string> result;
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if (this->Root) {
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result = this->Root->WatchedFiles();
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}
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return result;
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}
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std::vector<std::string> cmFileMonitor::WatchedDirectories() const
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{
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std::vector<std::string> result;
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if (this->Root) {
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result = this->Root->WatchedDirectories();
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}
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return result;
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}
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