beast_PropertyStream.cpp

#include <xrpl/beast/utility/PropertyStream.h>
#include <xrpl/beast/utility/instrumentation.h>
 
#include <algorithm>
#include <iostream>
#include <mutex>
#include <string>
#include <utility>
 
namespace beast {
 
//------------------------------------------------------------------------------
//
// Item
//
//------------------------------------------------------------------------------
 
PropertyStream::Item::Item(Source* source) : m_source(source)
{
}
 
PropertyStream::Source&
PropertyStream::Item::source() const
{
    return *m_source;
}
 
PropertyStream::Source*
PropertyStream::Item::operator->() const
{
    return &source();
}
 
PropertyStream::Source&
PropertyStream::Item::operator*() const
{
    return source();
}
 
//------------------------------------------------------------------------------
//
// Proxy
//
//------------------------------------------------------------------------------
 
PropertyStream::Proxy::Proxy(Map const& map, std::string const& key) : m_map(&map), m_key(key)
{
}
 
PropertyStream::Proxy::Proxy(Proxy const& other) : m_map(other.m_map), m_key(other.m_key)
{
}
 
PropertyStream::Proxy::~Proxy()
{
    std::string const s(m_ostream.str());
    if (!s.empty())
        m_map->add(m_key, s);
}
 
std::ostream&
PropertyStream::Proxy::operator<<(std::ostream& manip(std::ostream&)) const
{
    return m_ostream << manip;
}
 
//------------------------------------------------------------------------------
//
// Map
//
//------------------------------------------------------------------------------
 
PropertyStream::Map::Map(PropertyStream& stream) : m_stream(stream)
{
}
 
PropertyStream::Map::Map(Set& parent) : m_stream(parent.stream())
{
    m_stream.map_begin();
}
 
PropertyStream::Map::Map(std::string const& key, Map& map) : m_stream(map.stream())
{
    m_stream.map_begin(key);
}
 
PropertyStream::Map::Map(std::string const& key, PropertyStream& stream) : m_stream(stream)
{
    m_stream.map_begin(key);
}
 
PropertyStream::Map::~Map()
{
    m_stream.map_end();
}
 
PropertyStream&
PropertyStream::Map::stream()
{
    return m_stream;
}
 
PropertyStream const&
PropertyStream::Map::stream() const
{
    return m_stream;
}
 
PropertyStream::Proxy
PropertyStream::Map::operator[](std::string const& key)
{
    return Proxy(*this, key);
}
 
//------------------------------------------------------------------------------
//
// Set
//
//------------------------------------------------------------------------------
 
PropertyStream::Set::Set(std::string const& key, Map& map) : m_stream(map.stream())
{
    m_stream.array_begin(key);
}
 
PropertyStream::Set::Set(std::string const& key, PropertyStream& stream) : m_stream(stream)
{
    m_stream.array_begin(key);
}
 
PropertyStream::Set::~Set()
{
    m_stream.array_end();
}
 
PropertyStream&
PropertyStream::Set::stream()
{
    return m_stream;
}
 
PropertyStream const&
PropertyStream::Set::stream() const
{
    return m_stream;
}
 
//------------------------------------------------------------------------------
//
// Source
//
//------------------------------------------------------------------------------
 
PropertyStream::Source::Source(std::string const& name) : m_name(name), item_(this), parent_(nullptr)
{
}
 
PropertyStream::Source::~Source()
{
    std::lock_guard _(lock_);
    if (parent_ != nullptr)
        parent_->remove(*this);
    removeAll();
}
 
std::string const&
PropertyStream::Source::name() const
{
    return m_name;
}
 
void
PropertyStream::Source::add(Source& source)
{
    std::lock(lock_, source.lock_);
    std::lock_guard lk1(lock_, std::adopt_lock);
    std::lock_guard lk2(source.lock_, std::adopt_lock);
 
    XRPL_ASSERT(source.parent_ == nullptr, "beast::PropertyStream::Source::add : null source parent");
    children_.push_back(source.item_);
    source.parent_ = this;
}
 
void
PropertyStream::Source::remove(Source& child)
{
    std::lock(lock_, child.lock_);
    std::lock_guard lk1(lock_, std::adopt_lock);
    std::lock_guard lk2(child.lock_, std::adopt_lock);
 
    XRPL_ASSERT(child.parent_ == this, "beast::PropertyStream::Source::remove : child parent match");
    children_.erase(children_.iterator_to(child.item_));
    child.parent_ = nullptr;
}
 
void
PropertyStream::Source::removeAll()
{
    std::lock_guard _(lock_);
    for (auto iter = children_.begin(); iter != children_.end();)
    {
        std::lock_guard _cl((*iter)->lock_);
        remove(*(*iter));
    }
}
 
//------------------------------------------------------------------------------
 
void
PropertyStream::Source::write_one(PropertyStream& stream)
{
    Map map(m_name, stream);
    onWrite(map);
}
 
void
PropertyStream::Source::write(PropertyStream& stream)
{
    Map map(m_name, stream);
    onWrite(map);
 
    std::lock_guard _(lock_);
 
    for (auto& child : children_)
        child.source().write(stream);
}
 
void
PropertyStream::Source::write(PropertyStream& stream, std::string const& path)
{
    std::pair<Source*, bool> result(find(path));
 
    if (result.first == nullptr)
        return;
 
    if (result.second)
        result.first->write(stream);
    else
        result.first->write_one(stream);
}
 
std::pair<PropertyStream::Source*, bool>
PropertyStream::Source::find(std::string path)
{
    bool const deep(peel_trailing_slashstar(&path));
    bool const rooted(peel_leading_slash(&path));
    Source* source(this);
    if (!path.empty())
    {
        if (!rooted)
        {
            std::string const name(peel_name(&path));
            source = find_one_deep(name);
            if (source == nullptr)
                return std::make_pair(nullptr, deep);
        }
        source = source->find_path(path);
    }
    return std::make_pair(source, deep);
}
 
bool
PropertyStream::Source::peel_leading_slash(std::string* path)
{
    if (!path->empty() && path->front() == '/')
    {
        *path = std::string(path->begin() + 1, path->end());
        return true;
    }
    return false;
}
 
bool
PropertyStream::Source::peel_trailing_slashstar(std::string* path)
{
    bool found(false);
    if (path->empty())
        return false;
    if (path->back() == '*')
    {
        found = true;
        path->pop_back();
    }
    if (!path->empty() && path->back() == '/')
        path->pop_back();
    return found;
}
 
std::string
PropertyStream::Source::peel_name(std::string* path)
{
    if (path->empty())
        return "";
 
    std::string::const_iterator first = (*path).begin();
    std::string::const_iterator last = (*path).end();
    std::string::const_iterator pos = std::find(first, last, '/');
    std::string s(first, pos);
 
    if (pos != last)
        *path = std::string(pos + 1, last);
    else
        *path = std::string();
 
    return s;
}
 
// Recursive search through the whole tree until name is found
PropertyStream::Source*
PropertyStream::Source::find_one_deep(std::string const& name)
{
    Source* found = find_one(name);
    if (found != nullptr)
        return found;
 
    std::lock_guard _(lock_);
    for (auto& s : children_)
    {
        found = s.source().find_one_deep(name);
        if (found != nullptr)
            return found;
    }
    return nullptr;
}
 
PropertyStream::Source*
PropertyStream::Source::find_path(std::string path)
{
    if (path.empty())
        return this;
    Source* source(this);
    do
    {
        std::string const name(peel_name(&path));
        if (name.empty())
            break;
        source = source->find_one(name);
    } while (source != nullptr);
    return source;
}
 
// This function only looks at immediate children
// If no immediate children match, then return nullptr
PropertyStream::Source*
PropertyStream::Source::find_one(std::string const& name)
{
    std::lock_guard _(lock_);
    for (auto& s : children_)
    {
        if (s.source().m_name == name)
            return &s.source();
    }
    return nullptr;
}
 
void
PropertyStream::Source::onWrite(Map&)
{
}
 
//------------------------------------------------------------------------------
//
// PropertyStream
//
//------------------------------------------------------------------------------
 
void
PropertyStream::add(std::string const& key, bool value)
{
    if (value)
        add(key, "true");
    else
        add(key, "false");
}
 
void
PropertyStream::add(std::string const& key, char value)
{
    lexical_add(key, value);
}
 
void
PropertyStream::add(std::string const& key, signed char value)
{
    lexical_add(key, value);
}
 
void
PropertyStream::add(std::string const& key, unsigned char value)
{
    lexical_add(key, value);
}
 
void
PropertyStream::add(std::string const& key, short value)
{
    lexical_add(key, value);
}
 
void
PropertyStream::add(std::string const& key, unsigned short value)
{
    lexical_add(key, value);
}
 
void
PropertyStream::add(std::string const& key, int value)
{
    lexical_add(key, value);
}
 
void
PropertyStream::add(std::string const& key, unsigned int value)
{
    lexical_add(key, value);
}
 
void
PropertyStream::add(std::string const& key, long value)
{
    lexical_add(key, value);
}
 
void
PropertyStream::add(std::string const& key, unsigned long value)
{
    lexical_add(key, value);
}
 
void
PropertyStream::add(std::string const& key, long long value)
{
    lexical_add(key, value);
}
 
void
PropertyStream::add(std::string const& key, unsigned long long value)
{
    lexical_add(key, value);
}
 
void
PropertyStream::add(std::string const& key, float value)
{
    lexical_add(key, value);
}
 
void
PropertyStream::add(std::string const& key, double value)
{
    lexical_add(key, value);
}
 
void
PropertyStream::add(std::string const& key, long double value)
{
    lexical_add(key, value);
}
 
void
PropertyStream::add(bool value)
{
    if (value)
        add("true");
    else
        add("false");
}
 
void
PropertyStream::add(char value)
{
    lexical_add(value);
}
 
void
PropertyStream::add(signed char value)
{
    lexical_add(value);
}
 
void
PropertyStream::add(unsigned char value)
{
    lexical_add(value);
}
 
void
PropertyStream::add(short value)
{
    lexical_add(value);
}
 
void
PropertyStream::add(unsigned short value)
{
    lexical_add(value);
}
 
void
PropertyStream::add(int value)
{
    lexical_add(value);
}
 
void
PropertyStream::add(unsigned int value)
{
    lexical_add(value);
}
 
void
PropertyStream::add(long value)
{
    lexical_add(value);
}
 
void
PropertyStream::add(unsigned long value)
{
    lexical_add(value);
}
 
void
PropertyStream::add(long long value)
{
    lexical_add(value);
}
 
void
PropertyStream::add(unsigned long long value)
{
    lexical_add(value);
}
 
void
PropertyStream::add(float value)
{
    lexical_add(value);
}
 
void
PropertyStream::add(double value)
{
    lexical_add(value);
}
 
void
PropertyStream::add(long double value)
{
    lexical_add(value);
}
 
}  // namespace beast