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