erigon-pulse/cmd/sentinel/decode/main.go

/*
   Copyright 2022 Erigon-Lightclient contributors
   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at
       http://www.apache.org/licenses/LICENSE-2.0
   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/

package main

import (
	"bytes"
	"encoding/hex"
	"fmt"
	"io"
	"strings"

	"github.com/golang/snappy"
	"github.com/ledgerwatch/erigon/cl/cltypes"
)

var (
	// Hex encoded.
	metadataV1Response       = "10ff060000734e6150705901140000a43afc0e0b000000000000000000000000002000"
	metadataV2Response       = "11ff060000734e6150705901150000b3a056ea0000000000000000000000000000000000"
	finalityUpdateResponse   = "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"
	optimisticUpdateResponse = "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"
	lightClientUpdate        = `
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`
)

func decodeTestResponses(data string, result cltypes.ObjectSSZ, prefixBytes uint8) {
	msg, err := hex.DecodeString(data)
	if err != nil {
		fmt.Printf("unable to decode string into byte slice: %v", err)
		return
	}
	fmt.Printf("Hex Packet: %x\n", msg)

	// Get the size of the object.
	ln := result.SizeSSZ()
	fmt.Printf("size: %d\n", ln)

	// Read first six bytes.
	r := bytes.NewReader(msg)
	r.Read(make([]byte, prefixBytes))

	// Now we can construct the snappy reader.
	sr := snappy.NewReader(r)
	decompressed := make([]byte, ln)

	// Do the snappy decompression.
	if _, err := io.ReadFull(sr, decompressed); err != nil {
		fmt.Printf("unable to decompress data: %v\n", err)
		return
	}

	// Unmarshal into our result object.
	err = result.UnmarshalSSZ(decompressed)
	if err != nil {
		fmt.Printf("unable to unmarshall data: %v\n", err)
		return
	}
	fmt.Printf("decoded object: %+v\n", result)
}

func main() {
	decodeTestResponses(metadataV1Response, &cltypes.MetadataV1{}, 1)
	decodeTestResponses(metadataV2Response, &cltypes.MetadataV2{}, 1) // Doesn't work.
	decodeTestResponses(finalityUpdateResponse, &cltypes.LightClientFinalityUpdate{}, 6)
	decodeTestResponses(optimisticUpdateResponse, &cltypes.LightClientOptimisticUpdate{}, 6)
	decodeTestResponses(strings.ReplaceAll(lightClientUpdate, "\n", ""), &cltypes.LightClientUpdate{}, 7)
}