nejigane/jsonconfig

jsonconfig

jsonconfig is a simple helper class with json object for application configuration.

• simply wrap pficommon json object
• readable error messages with jsonpath which indicates invalid configuration

Build

$ ./waf configure & ./waf & ./waf install

Supported Types

pficommon json compatible.

• bool
• int
• long
• float
• double
• std::string
• std::vector
• std::map
• pfi::data::unordered_map
• pfi::data::optional

Example

Assume you have a configuration file like this:

{ "web_server": {
    "host": "http://hoge.com",
    "port": 8080  },
  "users": ["saitama", "gumma", "ibaraki"]
}

You can access it with as method:

jsonconfig::config_root config = jsonconfig::load("path/to/json/file");
// print "http://hoge.com"
std::cout << config["web_server"]["host"].as<std::string>() << std::endl;
// print 8080
std::cout << config["web_server"]["port"].as<int>() << std::endl;

You can use struct to define schema of configuration explicitly:

struct server_conf {
  struct web_conf {
    std::string host;
    int port;

    templpate <typename Ar>
    void serialize(Ar& ar) {
      ar & MEMBER(host) & MEMBER(port);
    }
  } web_server;

  std::vector<std::string> users;

  template <typename Ar>
  void serialize(Ar& ar) {
    ar & MEMBER(web_server) & MEMBER(users);
  }
};

server_conf server = jsonconfig::config_cast<server_conf>(conf);