Class: Xasin::Telegram::HTTPCore

Inherits:
Object
  • Object
show all
Defined in:
lib/xasin/telegram/HTTPCore.rb

Overview

This class handles the direct connection to the Telegram API All it does is handle a receive loop with the fitting update IDs, as well as a rescue’d “perform post” message.

Direct Known Subclasses

TestCore

Instance Method Summary collapse

Constructor Details

#initialize(apikey) ⇒ HTTPCore

Returns a new instance of HTTPCore.



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# File 'lib/xasin/telegram/HTTPCore.rb', line 12

def initialize(apikey)
	@apikey = apikey;

	@lastUpdateID = 0;
	# Start the receive loop. Shouldn't crash, but if it does we
	# want to know.
	@receiveThread = Thread.new do
		receive_loop();
	end
	@receiveThread.abort_on_exception = true

	# Receptors are class instances that will receive updates
	# from the HTTP update connection
	@receptors = Array.new();
end

Instance Method Details

#attach_receptor(receptorClass) ⇒ Object

TODO check if the class supports handle_packet



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# File 'lib/xasin/telegram/HTTPCore.rb', line 123

def attach_receptor(receptorClass)
	@receptors << receptorClass;
end

#feed_receptors(data) ⇒ Object 



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# File 'lib/xasin/telegram/HTTPCore.rb', line 79

def feed_receptors(data)
	# Hand it out to the receptors
	@receptors.each do |r|
		begin
			r.handle_packet(data);
		rescue => e
			warn "Error in repector: #{e}"
			warn e.backtrace.join("\n");
		end
	end
end

#perform_post(method, data = nil) ⇒ Object

Perform a POST request.

Parameters:

  • method (String) —

    The Telegram bot API method that should be called

  • data (nil, Hash) (defaults to: nil) —

    The data to be sent with the command. Caution, any nested Hashes and Arrays will be converted to JSON BEFORE the Hash itself is also JSON-ified. Telegram apparently needs this to work.



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# File 'lib/xasin/telegram/HTTPCore.rb', line 58

def perform_post(method, data = nil)
	call_address = "https://api.telegram.org/bot#{@apikey}/#{method}"

	# Rescue-construct to prevent a HTTP error from
	# crashing our system.
	timeoutLen = data[:timeout] if data.is_a? Hash
	timeoutLen ||= 4;
	retryCount = 0;
	begin
		Timeout.timeout(timeoutLen) do
			return _raw_post(call_address, _double_json_data(data));
		end
	rescue
		retryCount += 1;
		return {} if retryCount >= 3;

		sleep 0.5;
		retry
	end
end

#receive_loop ⇒ Object

Handle receiving of the data from Telegram API This is done via the “getUpdates” HTTP Request, with a timeout of 20s Update-ID offset is handled automagically by the system, so you needn’t worry about it.



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# File 'lib/xasin/telegram/HTTPCore.rb', line 96

def receive_loop()
	loop do
		begin
			# Perform the update request
			packet = perform_post("getUpdates", {timeout: 20, offset: @lastUpdateID + 1})

			next unless packet[:ok];
			# Check if there even was a message sent by Telegram
			# Due to the 20s timeout, a zero-length reply can happen
			next if packet[:result].length == 0;

			# Handle each result individually.
			packet[:result].each do |data|
				hUpdateID = data[:update_id].to_i
				# Calculate the maximum Update ID (for the offset "getUpdates" parameter)
				@lastUpdateID = [hUpdateID, @lastUpdateID].max

				feed_receptors data
			end
		rescue
			sleep 1
			retry
		end
	end
end