115 lines
4.0 KiB
Go
115 lines
4.0 KiB
Go
// VulcanizeDB
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// Copyright © 2018 Vulcanize
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package contract
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import (
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"errors"
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"github.com/ethereum/go-ethereum/accounts/abi"
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"github.com/vulcanize/vulcanizedb/pkg/core"
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"github.com/vulcanize/vulcanizedb/pkg/filters"
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"github.com/vulcanize/vulcanizedb/pkg/omni/shared/helpers"
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"github.com/vulcanize/vulcanizedb/pkg/omni/shared/types"
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)
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// Contract object to hold our contract data
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type Contract struct {
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Name string // Name of the contract
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Address string // Address of the contract
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Network string // Network on which the contract is deployed; default empty "" is Ethereum mainnet
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StartingBlock int64 // Starting block of the contract
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LastBlock int64 // Most recent block on the network
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Abi string // Abi string
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ParsedAbi abi.ABI // Parsed abi
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Events map[string]types.Event // Map of events to their names
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Methods map[string]types.Method // Map of methods to their names
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Filters map[string]filters.LogFilter // Map of event filters to their names
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EventAddrs map[string]bool // User-input list of account addresses to watch events for
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MethodAddrs map[string]bool // User-input list of account addresses to poll methods for
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TknHolderAddrs map[string]bool // List of all contract-associated addresses, populated as events are transformed
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}
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// Use contract info to generate event filters
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func (c *Contract) GenerateFilters() error {
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c.Filters = map[string]filters.LogFilter{}
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for name, event := range c.Events {
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c.Filters[name] = filters.LogFilter{
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Name: name,
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FromBlock: c.StartingBlock,
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ToBlock: -1,
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Address: c.Address,
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Topics: core.Topics{helpers.GenerateSignature(event.Sig())}, // move generate signatrue to pkg
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}
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}
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// If no filters were generated, throw an error (no point in continuing with this contract)
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if len(c.Filters) == 0 {
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return errors.New("error: no filters created")
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}
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return nil
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}
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// Returns true if address is in list of addresses to
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// filter events for or if no filtering is specified
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func (c *Contract) IsEventAddr(addr string) bool {
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if c.EventAddrs == nil {
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return false
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} else if len(c.EventAddrs) == 0 {
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return true
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} else if a, ok := c.EventAddrs[addr]; ok {
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return a
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}
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return false
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}
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// Returns true if address is in list of addresses to
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// poll methods for or if no filtering is specified
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func (c *Contract) IsMethodAddr(addr string) bool {
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if c.MethodAddrs == nil {
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return false
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} else if len(c.MethodAddrs) == 0 {
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return true
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} else if a, ok := c.MethodAddrs[addr]; ok {
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return a
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}
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return false
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}
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// Returns true if mapping value matches filtered for address or if not filter exists
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// Used to check if an event log name-value mapping should be filtered or not
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func (c *Contract) PassesEventFilter(args map[string]string) bool {
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for _, arg := range args {
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if c.IsEventAddr(arg) {
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return true
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}
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}
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return false
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}
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// Used to add an address to the token holder address list
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// if it is on the method polling list or the filter is open
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func (c *Contract) AddTokenHolderAddress(addr string) {
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if c.TknHolderAddrs != nil && c.IsMethodAddr(addr) {
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c.TknHolderAddrs[addr] = true
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}
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}
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