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 (
"bytes"
"github.com/ethereum/go-ethereum/common"
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"github.com/ipfs/go-cid"
"github.com/ipfs/go-ipfs-blockstore"
"github.com/ipfs/go-ipfs-ds-help"
node "github.com/ipfs/go-ipld-format"
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"github.com/jmoiron/sqlx"
"github.com/sirupsen/logrus"
"github.com/vulcanize/ipfs-blockchain-watcher/pkg/ipfs"
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"github.com/vulcanize/ipfs-blockchain-watcher/pkg/ipfs/ipld"
)
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// ListContainsString used to check if a list of strings contains a particular string
func ListContainsString(sss []string, s string) bool {
for _, str := range sss {
if s == str {
return true
}
}
return false
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}
// IPLDsContainBytes used to check if a list of strings contains a particular string
func IPLDsContainBytes(iplds []ipfs.BlockModel, b []byte) bool {
for _, ipld := range iplds {
if bytes.Equal(ipld.Data, b) {
return true
}
}
return false
}
// ListContainsGap used to check if a list of Gaps contains a particular Gap
func ListContainsGap(gapList []Gap, gap Gap) bool {
for _, listGap := range gapList {
if listGap == gap {
return true
}
}
return false
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}
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// HandleNullAddrPointer will return an emtpy string for a nil address pointer
func HandleNullAddrPointer(to *common.Address) string {
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if to == nil {
return ""
}
return to.Hex()
}
// HandleNullAddr will return an empty string for a a null address
func HandleNullAddr(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)
}
}
// PublishIPLD is used to insert an ipld into Postgres blockstore with the provided tx
func PublishIPLD(tx *sqlx.Tx, i node.Node) error {
dbKey := dshelp.MultihashToDsKey(i.Cid().Hash())
prefixedKey := blockstore.BlockPrefix.String() + dbKey.String()
raw := i.RawData()
_, err := tx.Exec(`INSERT INTO public.blocks (key, data) VALUES ($1, $2) ON CONFLICT (key) DO NOTHING`, prefixedKey, raw)
return err
}
// FetchIPLD is used to retrieve an ipld from Postgres blockstore with the provided tx
func FetchIPLD(tx *sqlx.Tx, cid string) ([]byte, error) {
mhKey, err := MultihashKeyFromCIDString(cid)
if err != nil {
return nil, err
}
pgStr := `SELECT data FROM public.blocks WHERE key = $1`
var block []byte
return block, tx.Get(&block, pgStr, mhKey)
}
// 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
}
// PublishRaw derives a cid from raw bytes and provided codec and multihash type, and writes it to the db tx
func PublishRaw(tx *sqlx.Tx, codec, mh uint64, raw []byte) (string, error) {
c, err := ipld.RawdataToCid(codec, raw, mh)
if err != nil {
return "", err
}
dbKey := dshelp.MultihashToDsKey(c.Hash())
prefixedKey := blockstore.BlockPrefix.String() + dbKey.String()
_, err = tx.Exec(`INSERT INTO public.blocks (key, data) VALUES ($1, $2) ON CONFLICT (key) DO NOTHING`, prefixedKey, raw)
return c.String(), err
}