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Add database transactions to postgres repository

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* Repository returns error when CreateBlock fails.
This commit is contained in:
Matt Krump 2017-11-07 11:56:49 -06:00 committed by Eric Meyer
parent d3b3da7f17
commit df9e7ebcc5
4 changed files with 82 additions and 12 deletions
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3
pkg/repositories/in_memory.go
View File

@ -24,8 +24,9 @@ func NewInMemory() *InMemory {
}
}
func (repository *InMemory) CreateBlock(block core.Block) {
func (repository *InMemory) CreateBlock(block core.Block) error {
repository.blocks[block.Number] = &block
return nil
}
func (repository *InMemory) BlockCount() int {

43
pkg/repositories/postgres.go
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@ -3,6 +3,9 @@ package repositories
import (
"database/sql"
"context"
"errors"
"github.com/8thlight/vulcanizedb/pkg/core"
"github.com/jmoiron/sqlx"
_ "github.com/lib/pq"
@ -12,6 +15,10 @@ type Postgres struct {
Db *sqlx.DB
}
var (
ErrDBInsertFailed = errors.New("postgres: insert failed")
)
func (repository Postgres) MaxBlockNumber() int64 {
var highestBlockNumber int64
repository.Db.Get(&highestBlockNumber, `SELECT MAX(block_number) FROM blocks`)
@ -57,26 +64,42 @@ func (repository Postgres) BlockCount() int {
return count
}
func (repository Postgres) CreateBlock(block core.Block) {
insertedBlock := repository.Db.QueryRow(
func (repository Postgres) CreateBlock(block core.Block) error {
tx, _ := repository.Db.BeginTx(context.Background(), nil)
var blockId int64
err := tx.QueryRow(
`INSERT INTO blocks
(block_number, block_gaslimit, block_gasused, block_time, block_difficulty, block_hash, block_nonce, block_parenthash, block_size, uncle_hash)
VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10) RETURNING id`,
block.Number, block.GasLimit, block.GasUsed, block.Time, block.Difficulty, block.Hash, block.Nonce, block.ParentHash, block.Size, block.UncleHash)
var blockId int64
insertedBlock.Scan(&blockId)
repository.createTransactions(blockId, block.Transactions)
VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10)
RETURNING id `,
block.Number, block.GasLimit, block.GasUsed, block.Time, block.Difficulty, block.Hash, block.Nonce, block.ParentHash, block.Size, block.UncleHash).
Scan(&blockId)
if err != nil {
tx.Rollback()
return ErrDBInsertFailed
}
err = repository.createTransactions(tx, blockId, block.Transactions)
if err != nil {
tx.Rollback()
return ErrDBInsertFailed
}
tx.Commit()
return nil
}
func (repository Postgres) createTransactions(blockId int64, transactions []core.Transaction) {
func (repository Postgres) createTransactions(tx *sql.Tx, blockId int64, transactions []core.Transaction) error {
for _, transaction := range transactions {
repository.Db.MustExec(
_, err := tx.Exec(
`INSERT INTO transactions
(block_id, tx_hash, tx_nonce, tx_to, tx_gaslimit, tx_gasprice, tx_value)
VALUES ($1, $2, $3, $4, $5, $6, $7)`,
blockId, transaction.Hash, transaction.Nonce, transaction.To, transaction.GasLimit, transaction.GasPrice, transaction.Value)
if err != nil {
return err
}
}
return nil
}
func (repository Postgres) loadBlock(blockRows *sql.Rows) core.Block {
var blockId int64
@ -107,7 +130,7 @@ func (repository Postgres) loadBlock(blockRows *sql.Rows) core.Block {
}
}
func (repository Postgres) loadTransactions(blockId int64) []core.Transaction {
transactionRows, _ := repository.Db.Query("SELECT tx_hash, tx_nonce, tx_to, tx_gaslimit, tx_gasprice, tx_value FROM transactions")
transactionRows, _ := repository.Db.Query(`SELECT tx_hash, tx_nonce, tx_to, tx_gaslimit, tx_gasprice, tx_value FROM transactions`)
var transactions []core.Transaction
for transactionRows.Next() {
var hash string

2
pkg/repositories/repository.go
View File

@ -3,7 +3,7 @@ package repositories
import "github.com/8thlight/vulcanizedb/pkg/core"
type Repository interface {
CreateBlock(block core.Block)
CreateBlock(block core.Block) error
BlockCount() int
FindBlockByNumber(blockNumber int64) *core.Block
MaxBlockNumber() int64

46
pkg/repositories/repository_test.go
View File

@ -1,6 +1,9 @@
package repositories_test
import (
"fmt"
"strings"
"github.com/8thlight/vulcanizedb/pkg/config"
"github.com/8thlight/vulcanizedb/pkg/core"
"github.com/8thlight/vulcanizedb/pkg/repositories"
@ -133,6 +136,7 @@ var _ = Describe("Repositories", func() {
Expect(savedTransaction.GasPrice).To(Equal(gasPrice))
Expect(savedTransaction.Value).To(Equal(value))
})
})
Describe("The missing block numbers", func() {
@ -219,6 +223,48 @@ var _ = Describe("Repositories", func() {
Expect(db).ShouldNot(BeNil())
})
It("does not commit block if block is invalid", func() {
//badNonce violates db Nonce field length
badNonce := fmt.Sprintf("x %s", strings.Repeat("1", 100))
badBlock := core.Block{
Number: 123,
Nonce: badNonce,
Transactions: []core.Transaction{},
}
pgConfig := config.DbConnectionString(config.NewConfig("private").Database)
db, _ := sqlx.Connect("postgres", pgConfig)
Expect(db).ShouldNot(BeNil())
repository := repositories.NewPostgres(db)
err := repository.CreateBlock(badBlock)
savedBlock := repository.FindBlockByNumber(123)
Expect(err).ToNot(BeNil())
Expect(savedBlock).To(BeNil())
})
It("does not commit block or transactions if transaction is invalid", func() {
//badHash violates db To field length
badHash := fmt.Sprintf("x %s", strings.Repeat("1", 100))
badTransaction := core.Transaction{To: badHash}
pgConfig := config.DbConnectionString(config.NewConfig("private").Database)
block := core.Block{
Number: 123,
Transactions: []core.Transaction{badTransaction},
}
db, _ := sqlx.Connect("postgres", pgConfig)
Expect(db).ShouldNot(BeNil())
repository := repositories.NewPostgres(db)
err := repository.CreateBlock(block)
savedBlock := repository.FindBlockByNumber(123)
Expect(err).ToNot(BeNil())
Expect(savedBlock).To(BeNil())
})
AssertRepositoryBehavior(func() repositories.Repository {
pgConfig := config.DbConnectionString(config.NewConfig("private").Database)
db, _ := sqlx.Connect("postgres", pgConfig)