ipld-eth-server/examples/erc20_watcher/every_block/repository.go

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// VulcanizeDB
// Copyright © 2018 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 every_block
import (
"fmt"
"log"
"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
)
// Interface definition for a generic ERC20 token repository
type ERC20TokenDatastore interface {
CreateSupply(supply TokenSupply) error
CreateBalance(balance TokenBalance) error
CreateAllowance(allowance TokenAllowance) error
MissingSupplyBlocks(startingBlock, highestBlock int64, tokenAddress string) ([]int64, error)
MissingBalanceBlocks(startingBlock, highestBlock int64, tokenAddress, holderAddress string) ([]int64, error)
MissingAllowanceBlocks(startingBlock, highestBlock int64, tokenAddress, holderAddress, spenderAddress string) ([]int64, error)
}
// Generic ERC20 token Repo struct
type ERC20TokenRepository struct {
*postgres.DB
}
// Repo error
type repositoryError struct {
err string
msg string
blockNumber int64
}
// Repo error method
func (re *repositoryError) Error() string {
return fmt.Sprintf(re.msg, re.blockNumber, re.err)
}
// Used to create a new Repo error for a given error and fetch method
func newRepositoryError(err error, msg string, blockNumber int64) error {
e := repositoryError{err.Error(), msg, blockNumber}
log.Println(e.Error())
return &e
}
// Constant error definitions
const (
GetBlockError = "Error fetching block number %d: %s"
InsertTokenSupplyError = "Error inserting token_supply for block number %d: %s"
InsertTokenBalanceError = "Error inserting token_balance for block number %d: %s"
InsertTokenAllowanceError = "Error inserting token_allowance for block number %d: %s"
MissingBlockError = "Error finding missing token_supply records starting at block %d: %s"
)
// Supply methods
// This method inserts the supply for a given token contract address at a given block height into the token_supply table
func (tsp *ERC20TokenRepository) CreateSupply(supply TokenSupply) error {
var blockId int
err := tsp.DB.Get(&blockId, `SELECT id FROM blocks WHERE number = $1 AND eth_node_id = $2`, supply.BlockNumber, tsp.NodeID)
if err != nil {
return newRepositoryError(err, GetBlockError, supply.BlockNumber)
}
_, err = tsp.DB.Exec(
`INSERT INTO token_supply (supply, token_address, block_id)
VALUES($1, $2, $3)`,
supply.Value, supply.TokenAddress, blockId)
if err != nil {
return newRepositoryError(err, InsertTokenSupplyError, supply.BlockNumber)
}
return nil
}
// This method returns an array of blocks that are missing a token_supply entry for a given tokenAddress
func (tsp *ERC20TokenRepository) MissingSupplyBlocks(startingBlock, highestBlock int64, tokenAddress string) ([]int64, error) {
blockNumbers := make([]int64, 0)
err := tsp.DB.Select(
&blockNumbers,
`SELECT number FROM BLOCKS
LEFT JOIN token_supply ON blocks.id = block_id
AND token_address = $1
WHERE block_id ISNULL
AND eth_node_id = $2
AND number >= $3
AND number <= $4
LIMIT 20`,
tokenAddress,
tsp.NodeID,
startingBlock,
highestBlock,
)
if err != nil {
return []int64{}, newRepositoryError(err, MissingBlockError, startingBlock)
}
return blockNumbers, err
}
// Balance methods
// This method inserts the balance for a given token contract address and token owner address at a given block height into the token_balance table
func (tsp *ERC20TokenRepository) CreateBalance(balance TokenBalance) error {
var blockId int
err := tsp.DB.Get(&blockId, `SELECT id FROM blocks WHERE number = $1 AND eth_node_id = $2`, balance.BlockNumber, tsp.NodeID)
if err != nil {
return newRepositoryError(err, GetBlockError, balance.BlockNumber)
}
_, err = tsp.DB.Exec(
`INSERT INTO token_balance (balance, token_address, block_id, token_holder_address)
VALUES($1, $2, $3, $4)`,
balance.Value, balance.TokenAddress, blockId, balance.TokenHolderAddress)
if err != nil {
return newRepositoryError(err, InsertTokenBalanceError, balance.BlockNumber)
}
return nil
}
// This method returns an array of blocks that are missing a token_balance entry for a given token contract address and token owner address
func (tsp *ERC20TokenRepository) MissingBalanceBlocks(startingBlock, highestBlock int64, tokenAddress, holderAddress string) ([]int64, error) {
blockNumbers := make([]int64, 0)
err := tsp.DB.Select(
&blockNumbers,
`SELECT number FROM BLOCKS
LEFT JOIN token_balance ON blocks.id = block_id
AND token_address = $1
AND token_holder_address = $2
WHERE block_id ISNULL
AND eth_node_id = $3
AND number >= $4
AND number <= $5
LIMIT 20`,
tokenAddress,
holderAddress,
tsp.NodeID,
startingBlock,
highestBlock,
)
if err != nil {
return []int64{}, newRepositoryError(err, MissingBlockError, startingBlock)
}
return blockNumbers, err
}
// Allowance methods
// This method inserts the allowance for a given token contract address, token owner address, and token spender address at a given block height into the
func (tsp *ERC20TokenRepository) CreateAllowance(allowance TokenAllowance) error {
var blockId int
err := tsp.DB.Get(&blockId, `SELECT id FROM blocks WHERE number = $1 AND eth_node_id = $2`, allowance.BlockNumber, tsp.NodeID)
if err != nil {
return newRepositoryError(err, GetBlockError, allowance.BlockNumber)
}
_, err = tsp.DB.Exec(
`INSERT INTO token_allowance (allowance, token_address, block_id, token_holder_address, token_spender_address)
VALUES($1, $2, $3, $4, $5)`,
allowance.Value, allowance.TokenAddress, blockId, allowance.TokenHolderAddress, allowance.TokenSpenderAddress)
if err != nil {
return newRepositoryError(err, InsertTokenAllowanceError, allowance.BlockNumber)
}
return nil
}
// This method returns an array of blocks that are missing a token_allowance entry for a given token contract address, token owner address, and token spender address
func (tsp *ERC20TokenRepository) MissingAllowanceBlocks(startingBlock, highestBlock int64, tokenAddress, holderAddress, spenderAddress string) ([]int64, error) {
blockNumbers := make([]int64, 0)
err := tsp.DB.Select(
&blockNumbers,
`SELECT number FROM BLOCKS
LEFT JOIN token_allowance ON blocks.id = block_id
AND token_address = $1
AND token_holder_address = $2
AND token_spender_address = $3
WHERE block_id ISNULL
AND eth_node_id = $4
AND number >= $5
AND number <= $6
LIMIT 20`,
tokenAddress,
holderAddress,
spenderAddress,
tsp.NodeID,
startingBlock,
highestBlock,
)
if err != nil {
return []int64{}, newRepositoryError(err, MissingBlockError, startingBlock)
}
return blockNumbers, err
}