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 (
"github.com/ipfs/go-ipfs-blockstore"
"github.com/ipfs/go-ipfs-ds-help"
"github.com/jmoiron/sqlx"
_ "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
}
// TestDB connect to the testing database
// it assumes the database has the IPFS public.blocks table present
// DO NOT use a production db for the test db, as it will remove all contents of the public.blocks table
func TestDB() (*sqlx.DB, error) {
connectStr := "postgresql://localhost:5432/vulcanize_testing?sslmode=disable"
return sqlx.Connect("postgres", connectStr)
}
// ResetTestDB drops all rows in the test db public.blocks table
func ResetTestDB(db *sqlx.DB) error {
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_, err := db.Exec("TRUNCATE public.blocks CASCADE")
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return err
}