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62 lines
1.8 KiB
62 lines
1.8 KiB
package proto
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import (
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"errors"
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)
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/*
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The message structure of any message in Harmony network
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---- content start -----
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1 byte - message category
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0x00: CONSENSUS
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0x01: NODE...
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1 byte - message type
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- for CONSENSUS category
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0x00: consensus
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0x01: sharding ...
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- for NODE category
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0x00: transaction ...
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n - 2 bytes - actual message payload
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---- content end -----
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*/
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// The message category enum
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type MessageCategory byte
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const (
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CONSENSUS MessageCategory = iota
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NODE
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CLIENT
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// TODO: add more types
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)
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// MESSAGE_CATEGORY_BYTES is the number of bytes message category takes
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const MESSAGE_CATEGORY_BYTES = 1
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// MESSAGE_TYPE_BYTES is the number of bytes message type takes
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const MESSAGE_TYPE_BYTES = 1
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// Get the message category from the p2p message content
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func GetMessageCategory(message []byte) (MessageCategory, error) {
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if len(message) < MESSAGE_CATEGORY_BYTES {
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return 0, errors.New("Failed to get message category: no data available.")
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}
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return MessageCategory(message[MESSAGE_CATEGORY_BYTES-1]), nil
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}
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// Get the message type from the p2p message content
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func GetMessageType(message []byte) (byte, error) {
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if len(message) < MESSAGE_CATEGORY_BYTES+MESSAGE_TYPE_BYTES {
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return 0, errors.New("Failed to get message type: no data available.")
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}
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return byte(message[MESSAGE_CATEGORY_BYTES+MESSAGE_TYPE_BYTES-1]), nil
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}
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// Get the node message payload from the p2p message content
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func GetMessagePayload(message []byte) ([]byte, error) {
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if len(message) < MESSAGE_CATEGORY_BYTES+MESSAGE_TYPE_BYTES {
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return []byte{}, errors.New("Failed to get message payload: no data available.")
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}
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return message[MESSAGE_CATEGORY_BYTES+MESSAGE_TYPE_BYTES:], nil
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}
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