Change Config Files to JSON

[moiri]

Instead of XML use JSON.

This will simplify work with a web backend.

[moiri]

The current config format is as follows:

<app name="app_name" log="log_conf_path">
  <net1 profiler="off" ...>
     ...
  </net1>
  ...
</app>

With json this would be mapped and extended as follows:

{
    "name": "app_name",
    "log": "log_conf_path",
    "nets": {
        "_default": {
            "profiler": false
        },
        "box_name1": {
            "_default": {
                "config": {}
            },
            "net_name1": {
                "_default": {
                    "config": "path to config file of net_id1"
                },
                "net_id1": null,
                "net_id2": {
                    "profiler": true,
                    "config": null
                }
            },
            "net_name2": null
        },
        "box_name2": {
            "_default": {
                "profiler": true,
                "config": {}
            }
        }
    }
}

Some notes:

• The XML structure allowed to map configurations to net names. The JSON structure is based on a hierarchy of the form all nets > box_name > net_name > net_id which allows to address each instance but also allows to use the same configuration for all instances at a certain hierarchy level (with the _default key). This covers moiri/streamix-rts#14.
• The field config of each net instance can have three types:
  • null: use the default configuration of the parent hierarchy
  • object: the list of net configuration options
  • string: a path to a json configuration file holding the list net configuration options. This covers moiri/streamix-rts#7
• With the new structure fields that are valid for all nets (e.g profiler) are separated from fields that are only valid for a specific box. The latter are defined in the config key.

[moiri]

implemented with 9c7df00

[moiri]

Adapted other projects accordingly:

• moiri/streamix-graph2c#e3a47a9
• box implementation smx_src_rand
• box implementation smx_prc_worker
• box implementation smx_snk_mongo