ipld-eth-server/pkg/datastore/postgres/repositories/logs_repository.go
Matt Krump 06f78e0083 Handle events
- Adds interfaces for developers to build handlers that update data in
response to log events
- Resolves #29
2018-03-05 10:01:50 -06:00

75 lines
1.8 KiB
Go

package repositories
import (
"context"
"database/sql"
"github.com/vulcanize/vulcanizedb/pkg/core"
"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
)
type LogRepository struct {
*postgres.DB
}
func (logRepository LogRepository) CreateLogs(lgs []core.Log) error {
tx, _ := logRepository.DB.BeginTx(context.Background(), nil)
for _, tlog := range lgs {
_, err := tx.Exec(
`INSERT INTO logs (block_number, address, tx_hash, index, topic0, topic1, topic2, topic3, data)
VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9)
`,
tlog.BlockNumber, tlog.Address, tlog.TxHash, tlog.Index, tlog.Topics[0], tlog.Topics[1], tlog.Topics[2], tlog.Topics[3], tlog.Data,
)
if err != nil {
tx.Rollback()
return postgres.ErrDBInsertFailed
}
}
tx.Commit()
return nil
}
func (logRepository LogRepository) GetLogs(address string, blockNumber int64) []core.Log {
logRows, _ := logRepository.DB.Query(
`SELECT block_number,
address,
tx_hash,
index,
topic0,
topic1,
topic2,
topic3,
data
FROM logs
WHERE address = $1 AND block_number = $2
ORDER BY block_number DESC`, address, blockNumber)
return logRepository.loadLogs(logRows)
}
func (logRepository LogRepository) loadLogs(logsRows *sql.Rows) []core.Log {
var lgs []core.Log
for logsRows.Next() {
var blockNumber int64
var address string
var txHash string
var index int64
var data string
var topics core.Topics
logsRows.Scan(&blockNumber, &address, &txHash, &index, &topics[0], &topics[1], &topics[2], &topics[3], &data)
lg := core.Log{
BlockNumber: blockNumber,
TxHash: txHash,
Address: address,
Index: index,
Data: data,
}
for i, topic := range topics {
lg.Topics[i] = topic
}
lgs = append(lgs, lg)
}
return lgs
}