ipld-eth-server/pkg/omni/shared/contract/contract.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 contract
import (
"errors"
"github.com/ethereum/go-ethereum/accounts/abi"
"github.com/vulcanize/vulcanizedb/pkg/core"
"github.com/vulcanize/vulcanizedb/pkg/filters"
"github.com/vulcanize/vulcanizedb/pkg/omni/shared/helpers"
"github.com/vulcanize/vulcanizedb/pkg/omni/shared/types"
)
// Contract object to hold our contract data
type Contract struct {
Name string // Name of the contract
Address string // Address of the contract
Network string // Network on which the contract is deployed; default empty "" is Ethereum mainnet
StartingBlock int64 // Starting block of the contract
LastBlock int64 // Most recent block on the network
Abi string // Abi string
ParsedAbi abi.ABI // Parsed abi
Events map[string]types.Event // Map of events to their names
Methods map[string]types.Method // Map of methods to their names
Filters map[string]filters.LogFilter // Map of event filters to their names
EventAddrs map[string]bool // User-input list of account addresses to watch events for
MethodAddrs map[string]bool // User-input list of account addresses to poll methods for
TknHolderAddrs map[string]bool // List of all contract-associated addresses, populated as events are transformed
}
// Use contract info to generate event filters
func (c *Contract) GenerateFilters() error {
c.Filters = map[string]filters.LogFilter{}
for name, event := range c.Events {
c.Filters[name] = filters.LogFilter{
Name: name,
FromBlock: c.StartingBlock,
ToBlock: -1,
Address: c.Address,
Topics: core.Topics{helpers.GenerateSignature(event.Sig())}, // move generate signatrue to pkg
}
}
// If no filters were generated, throw an error (no point in continuing with this contract)
if len(c.Filters) == 0 {
return errors.New("error: no filters created")
}
return nil
}
// Returns true if address is in list of addresses to
// filter events for or if no filtering is specified
func (c *Contract) IsEventAddr(addr string) bool {
if c.EventAddrs == nil {
return false
} else if len(c.EventAddrs) == 0 {
return true
} else if a, ok := c.EventAddrs[addr]; ok {
return a
}
return false
}
// Returns true if address is in list of addresses to
// poll methods for or if no filtering is specified
func (c *Contract) IsMethodAddr(addr string) bool {
if c.MethodAddrs == nil {
return false
} else if len(c.MethodAddrs) == 0 {
return true
} else if a, ok := c.MethodAddrs[addr]; ok {
return a
}
return false
}
// Returns true if mapping value matches filtered for address or if not filter exists
// Used to check if an event log name-value mapping should be filtered or not
func (c *Contract) PassesEventFilter(args map[string]string) bool {
for _, arg := range args {
if c.IsEventAddr(arg) {
return true
}
}
return false
}
// Used to add an address to the token holder address list
// if it is on the method polling list or the filter is open
func (c *Contract) AddTokenHolderAddress(addr string) {
if c.TknHolderAddrs != nil && c.IsMethodAddr(addr) {
c.TknHolderAddrs[addr] = true
}
}