Looks up for plugin by a given ParserFormat, using eventually pluginsFolder and library exception excluded the dot, in case one of them is empty string it will be replaced with the package DefaultPluginsFolder and DefaultLibraryExtension variables.

Default library file extension.

Default Plugin libraries folder.

Describe the exposed Plugin interface for the proxies access to the service triplets ( made of: Path string, net/common.ApiAction, net/cluster/types.Command).

Describe Proxy Lookup function, expected with name = ServiceDiscovery -> func()([]ServicePlugin).