ipld-eth-server/pkg/shared/functions.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 shared
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import (
"github.com/ethereum/go-ethereum/common"
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"github.com/ipfs/go-cid"
blockstore "github.com/ipfs/go-ipfs-blockstore"
dshelp "github.com/ipfs/go-ipfs-ds-help"
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"github.com/jmoiron/sqlx"
"github.com/sirupsen/logrus"
)
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// HandleZeroAddrPointer will return an emtpy string for a nil address pointer
func HandleZeroAddrPointer(to *common.Address) string {
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if to == nil {
return ""
}
return to.Hex()
}
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// HandleZeroAddr will return an empty string for a 0 value address
func HandleZeroAddr(to common.Address) string {
if to.Hex() == "0x0000000000000000000000000000000000000000" {
return ""
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}
return to.Hex()
}
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// Rollback sql transaction and log any error
func Rollback(tx *sqlx.Tx) {
if err := tx.Rollback(); err != nil {
logrus.Error(err)
}
}
// FetchIPLDByMhKeyAndBlockNumber is used to retrieve an ipld from Postgres blockstore with the provided tx, mhkey string and blockNumber
func FetchIPLDByMhKeyAndBlockNumber(tx *sqlx.Tx, mhKey string, blockNumber uint64) ([]byte, error) {
pgStr := `SELECT data FROM public.blocks WHERE key = $1 AND block_number = $2`
var block []byte
return block, tx.Get(&block, pgStr, mhKey, blockNumber)
}
// FetchIPLD is used to retrieve an IPLD from Postgres mhkey and blockNumber
func FetchIPLD(db *sqlx.DB, mhKey string, blockNumber uint64) ([]byte, error) {
pgStr := `SELECT data FROM public.blocks WHERE key = $1 AND block_number = $2`
var block []byte
return block, db.Get(&block, pgStr, mhKey, blockNumber)
}
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// MultihashKeyFromCID converts a cid into a blockstore-prefixed multihash db key string
func MultihashKeyFromCID(c cid.Cid) string {
dbKey := dshelp.MultihashToDsKey(c.Hash())
return blockstore.BlockPrefix.String() + dbKey.String()
}
// MultihashKeyFromCIDString converts a cid string into a blockstore-prefixed multihash db key string
func MultihashKeyFromCIDString(c string) (string, error) {
dc, err := cid.Decode(c)
if err != nil {
return "", err
}
dbKey := dshelp.MultihashToDsKey(dc.Hash())
return blockstore.BlockPrefix.String() + dbKey.String(), nil
}