mirror of
https://github.com/badaix/snapcast.git
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104 lines
1.8 KiB
C++
104 lines
1.8 KiB
C++
/***
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This file is part of snapcast
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Copyright (C) 2014-2018 Johannes Pohl
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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***/
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#ifndef METADATA_H
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#define METADATA_H
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#include "common/json.hpp"
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// Prefix used in output
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#define METADATA std::string("metadata")
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/*
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* Implement a generic metadata output handler
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*/
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using json = nlohmann::json;
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/*
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* Base class, prints to stdout
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*/
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class MetadataAdapter
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{
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public:
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MetadataAdapter()
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{
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reset();
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}
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virtual ~MetadataAdapter() = default;
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void reset()
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{
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msg_.reset(new json);
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}
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std::string serialize()
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{
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return METADATA + ":" + msg_->dump();
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}
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void tag(std::string name, std::string value)
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{
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(*msg_)[name] = value;
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}
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std::string operator[](std::string key)
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{
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try
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{
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return (*msg_)[key];
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}
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catch (std::domain_error&)
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{
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return std::string();
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}
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}
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virtual int push()
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{
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std::cout << serialize() << "\n";
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return 0;
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}
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int push(json& jtag)
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{
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msg_.reset(new json(jtag));
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return push();
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}
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protected:
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std::shared_ptr<json> msg_;
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};
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/*
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* Send metadata to stderr as json
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*/
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class MetaStderrAdapter: public MetadataAdapter
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{
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public:
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using MetadataAdapter::push;
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int push()
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{
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std::cerr << serialize() << "\n";
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return 0;
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}
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};
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#endif
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