2020-07-09 19:49:01 +00:00
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// VulcanizeDB
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// Copyright © 2019 Vulcanize
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package pgipfsethdb
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import (
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2020-09-09 15:51:10 +00:00
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"fmt"
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"github.com/ethereum/go-ethereum/common"
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2020-07-09 19:49:01 +00:00
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"github.com/ipfs/go-ipfs-blockstore"
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"github.com/ipfs/go-ipfs-ds-help"
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_ "github.com/lib/pq" //postgres driver
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"github.com/multiformats/go-multihash"
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)
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// MultihashKeyFromKeccak256 converts keccak256 hash bytes into a blockstore-prefixed multihash db key string
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func MultihashKeyFromKeccak256(h []byte) (string, error) {
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mh, err := multihash.Encode(h, multihash.KECCAK_256)
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if err != nil {
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return "", err
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}
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dbKey := dshelp.MultihashToDsKey(mh)
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return blockstore.BlockPrefix.String() + dbKey.String(), nil
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}
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2020-09-09 15:51:10 +00:00
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// DatastoreKeyFromGethKey returns the public.blocks key from the provided geth key
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2020-09-11 12:35:41 +00:00
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// It also returns the key's prefix, if it has one
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func DatastoreKeyFromGethKey(h []byte) (string, []byte, error) {
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keyType, keyComponents := ResolveKeyType(h)
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switch keyType {
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case Keccak:
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mhKey, err := MultihashKeyFromKeccak256(h)
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return mhKey, nil, err
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case Header:
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mhKey, err := MultihashKeyFromKeccak256(keyComponents[1])
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return mhKey, keyComponents[0], err
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case Preimage:
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mhKey, err := MultihashKeyFromKeccak256(keyComponents[1])
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return mhKey, keyComponents[0], err
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case Prefixed, Suffixed:
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2020-09-09 15:51:30 +00:00
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// This data is not mapped by hash => content by geth, store it using the prefixed/suffixed key directly
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// I.e. the public.blocks datastore key == the hex representation of the geth key
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2020-09-11 03:53:34 +00:00
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// Alternatively, decompose the data and derive the hash
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return common.Bytes2Hex(h), keyComponents[0], nil
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default:
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return "", nil, fmt.Errorf("invalid formatting of database key: %x", h)
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2020-09-09 15:51:10 +00:00
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}
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2020-07-09 19:49:01 +00:00
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}
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