60 lines
1.5 KiB
Crystal
60 lines
1.5 KiB
Crystal
require "json"
|
|
|
|
# IPC::JSON is the root class for all exchanged messages (using JSON).
|
|
# IPC::JSON inherited classes have a common 'type' class attribute,
|
|
# which enables to find the right IPC::JSON+ class given a TypedMessage's type.
|
|
|
|
# All transfered messages are typed messages.
|
|
# TypedMessage = u8 type (= IPC::JSON+ class type) + JSON content.
|
|
# 'JSON content' being a serialized IPC::JSON+ class.
|
|
|
|
# Conventionally, IPC::JSON+ classes have a 'handle' method to process incoming messages.
|
|
class IPC::JSON
|
|
include ::JSON::Serializable
|
|
|
|
class_property type = -1
|
|
property id : ::JSON::Any?
|
|
|
|
def type
|
|
@@type
|
|
end
|
|
|
|
macro message(id, type, &block)
|
|
class {{id}} < ::IPC::JSON
|
|
include ::JSON::Serializable
|
|
|
|
@@type = {{type}}
|
|
|
|
{{yield}}
|
|
end
|
|
end
|
|
end
|
|
|
|
class IPC
|
|
# Schedule messages contained into IPC::JSON+.
|
|
def schedule(fd : Int32, message : IPC::JSON)
|
|
typed_msg = IPCMessage::TypedMessage.new message.type.to_u8, message.to_json
|
|
schedule fd, typed_msg
|
|
end
|
|
|
|
def write(fd : Int32, message : IPC::JSON)
|
|
typed_msg = IPCMessage::TypedMessage.new message.type.to_u8, message.to_json
|
|
write fd, typed_msg
|
|
end
|
|
end
|
|
|
|
# CAUTION: only use this method on an Array(IPC::JSON.class).
|
|
class Array(T)
|
|
def parse_ipc_json(message : IPCMessage::TypedMessage) : IPC::JSON?
|
|
message_type = find &.type.==(message.type)
|
|
|
|
payload = String.new message.payload
|
|
|
|
if message_type.nil?
|
|
raise "invalid message type (#{message.type})"
|
|
end
|
|
|
|
message_type.from_json payload
|
|
end
|
|
end
|