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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#pragma once
#include <fmt/format.h>
#include <iosfwd>
#include <string>
#include <boost/optional.hpp>
#include "mongo/bson/util/builder.h"
namespace mongo {
class Status;
template <typename T>
class StatusWith;
class StringData;
/**
* Name of a process on the network.
*
* Composed of some name component, followed optionally by a colon and a numeric port. The name
* might be an IPv4 or IPv6 address or a relative or fully qualified host name, or an absolute
* path to a unix socket.
*/
struct HostAndPort {
/**
* Parses "text" to produce a HostAndPort. Returns either that or an error status describing
* the parse failure.
*/
static StatusWith<HostAndPort> parse(StringData text);
/**
* A version of 'parse' that throws a UserException if a parsing error is encountered.
*/
static HostAndPort parseThrowing(StringData text) {
return uassertStatusOK(parse(text));
}
/**
* Construct an empty/invalid HostAndPort.
*/
HostAndPort();
/**
* Constructs a HostAndPort by parsing "text" of the form hostname[:portnumber]
* Throws an AssertionException if bad config std::string or bad port #.
*/
explicit HostAndPort(StringData text);
/**
* Constructs a HostAndPort with the hostname "h" and port "p".
*
* If "p" is -1, port() returns ServerGlobalParams::DefaultDBPort.
*/
HostAndPort(const std::string& h, int p);
/**
* (Re-)initializes this HostAndPort by parsing "s". Returns
* Status::OK on success. The state of this HostAndPort is unspecified
* after initialize() returns a non-OK status, though it is safe to
* assign to it or re-initialize it.
*/
Status initialize(StringData s);
bool operator<(const HostAndPort& r) const;
bool operator==(const HostAndPort& r) const;
bool operator!=(const HostAndPort& r) const {
return !(*this == r);
}
/**
* Returns true if the hostname looks localhost-y.
*
* TODO: Make a more rigorous implementation, perhaps elsewhere in
* the networking library.
*/
bool isLocalHost() const;
/**
* Returns true if the hostname is an IP matching the default route.
*/
bool isDefaultRoute() const;
/**
* Returns a string representation of "host:port".
*/
std::string toString() const;
/**
* Returns true if this object represents no valid HostAndPort.
*/
bool empty() const;
const std::string& host() const {
return _host;
}
int port() const;
bool hasPort() const {
return _port >= 0;
}
template <typename H>
friend H AbslHashValue(H h, const HostAndPort& hostAndPort) {
return H::combine(std::move(h), hostAndPort.host(), hostAndPort.port());
}
private:
friend struct fmt::formatter<HostAndPort>;
struct AppendVisitor {
virtual void operator()(StringData v) = 0;
virtual void operator()(std::uint16_t v) = 0;
virtual ~AppendVisitor() = default;
};
void _appendToVisitor(AppendVisitor& sink) const;
template <typename F>
void _appendToPolymorphicFunc(F f) const;
template <typename Stream>
Stream& _appendToStream(Stream& os) const {
_appendToPolymorphicFunc([&](const auto& v) { os << v; });
return os;
}
friend std::ostream& operator<<(std::ostream& os, const HostAndPort& hp) {
return hp._appendToStream(os);
}
friend StringBuilder& operator<<(StringBuilder& os, const HostAndPort& hp) {
return hp._appendToStream(os);
}
friend StackStringBuilder& operator<<(StackStringBuilder& os, const HostAndPort& hp) {
return hp._appendToStream(os);
}
std::string _host;
int _port; // -1 indicates unspecified
};
template <typename F>
void HostAndPort::_appendToPolymorphicFunc(F f) const {
struct Vis : AppendVisitor {
explicit Vis(F f) : _f{std::move(f)} {}
void operator()(StringData v) override {
_f(v);
}
void operator()(std::uint16_t v) override {
_f(v);
}
F _f;
};
Vis visitor(std::move(f));
_appendToVisitor(visitor);
}
} // namespace mongo
namespace fmt {
template <>
struct formatter<mongo::HostAndPort> {
template <typename ParseContext>
constexpr auto parse(ParseContext& ctx) {
return ctx.begin();
}
template <typename FormatContext>
auto format(const mongo::HostAndPort& hp, FormatContext& ctx) {
auto&& it = ctx.out();
hp._appendToPolymorphicFunc([&](const auto& v) { it = fmt::format_to(it, "{}", v); });
return it;
}
};
} // namespace fmt
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