Class: RPCJSON

Inherits:
Object
  • Object
show all
Defined in:
lib/rpc-json.rb

Overview

Communicate with a JSON RPC server.

Instance Method Summary collapse

Constructor Details

#initialize(url) ⇒ RPCJSON

Returns a new instance of RPCJSON.



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# File 'lib/rpc-json.rb', line 11

def initialize(url)
	@url = url
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(meth, *args) ⇒ Object

Call call(meth, *args). If no error is raised, define_singleton_method(meth) to do the same.



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# File 'lib/rpc-json.rb', line 44

def method_missing(meth, *args)
	ret = call(meth, *args)

	# Make it so meth shows up in our methods list.
	unless methods.include?(meth.to_sym)
		define_singleton_method(meth) { |*args_| call(meth, *args_) }
	end

	ret
end

Instance Method Details

#call(meth, *args) ⇒ Object

Call the remote method meth with args. We raise NoMethodError if meth doesn’t exist on the remote side, and RPCJSONError if an error occured on the server.

Raises:



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# File 'lib/rpc-json.rb', line 18

def call(meth, *args)
	begin
		resp = RestClient.post(@url, {method: meth, params: args,
				                          id: :jsonrpc}.to_json)
	rescue RestClient::ResourceNotFound => ex
		if ex.http_code == 404
			raise(NoMethodError, "undefined method `#{meth}' for #{self}")
		else
			raise
		end
	rescue RestClient::InternalServerError => ex
		if ex.http_code == 500
			raise(RPCJSONError, JSON.parse(ex.http_body)['error']['message'])
		else
			raise
		end
	end

	parsed = JSON.parse(resp)
	raise(RPCJSONError, parsed['error']) if parsed['error']

	parsed['result']
end