Fantom-foundation/go-lachesis

package main

import (
    "fmt"

    "github.com/ethereum/go-ethereum/rlp"

    "github.com/Fantom-foundation/go-lachesis/hash"
    "github.com/Fantom-foundation/go-lachesis/inter"
    "github.com/Fantom-foundation/go-lachesis/kvdb"
    "github.com/Fantom-foundation/go-lachesis/kvdb/table"
)

func checkEvents(db kvdb.KeyValueStore) {
    t := table.New(db, []byte("e"))

    it := t.NewIterator(nil, nil)
    defer it.Release()

    found := make(map[hash.Event]struct{})
    losts := make(map[hash.Event]struct{})

    exists := func(e hash.Event) bool {
        _, ok := found[e]
        return ok
    }

    for it.Next() {
        event := &inter.Event{}
        err := rlp.DecodeBytes(it.Value(), event)
        if err != nil {
            panic(err)
        }

        found[event.Hash()] = struct{}{}

        for _, p := range event.Parents {
            if exists(p) {
                continue
            }
            losts[p] = struct{}{}
        }
    }

    // sanity check
    for p := range losts {
        if exists(p) {
            panic("event order")
        }
        fmt.Printf("%v\n", p)
    }
}