ipfs-ethdb/postgres/util.go

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// VulcanizeDB
// Copyright © 2019 Vulcanize
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package pgipfsethdb
import (
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"fmt"
"github.com/ethereum/go-ethereum/common"
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"github.com/ipfs/go-ipfs-blockstore"
"github.com/ipfs/go-ipfs-ds-help"
_ "github.com/lib/pq" //postgres driver
"github.com/multiformats/go-multihash"
)
// MultihashKeyFromKeccak256 converts keccak256 hash bytes into a blockstore-prefixed multihash db key string
func MultihashKeyFromKeccak256(h []byte) (string, error) {
mh, err := multihash.Encode(h, multihash.KECCAK_256)
if err != nil {
return "", err
}
dbKey := dshelp.MultihashToDsKey(mh)
return blockstore.BlockPrefix.String() + dbKey.String(), nil
}
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// DatastoreKeyFromGethKey returns the public.blocks key from the provided geth key
// It also returns the key's prefix, if it has one
func DatastoreKeyFromGethKey(h []byte) (string, []byte, error) {
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keyType, keyComponents := ResolveKeyType(h)
switch keyType {
case Keccak:
mhKey, err := MultihashKeyFromKeccak256(h)
return mhKey, nil, err
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case Header:
mhKey, err := MultihashKeyFromKeccak256(keyComponents[1])
return mhKey, keyComponents[0], err
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case Preimage:
mhKey, err := MultihashKeyFromKeccak256(keyComponents[1])
return mhKey, keyComponents[0], err
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case Prefixed, Suffixed:
// This data is not mapped by hash => content by geth, store it using the prefixed/suffixed key directly
// I.e. the public.blocks datastore key == the hex representation of the geth key
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// Alternatively, decompose the data and derive the hash
return common.Bytes2Hex(h), keyComponents[0], nil
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default:
return "", nil, fmt.Errorf("invalid formatting of database key: %x", h)
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}
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}