ipld-eth-server/libraries/shared/watcher/contract_watcher.go
2019-12-02 23:08:48 -06:00

76 lines
2.4 KiB
Go

// VulcanizeDB
// Copyright © 2019 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/>.
// Contract watcher is built with a more generic interface
// that allows offloading more of the operational logic to
// the transformers, allowing them to act more dynamically
// Built to work primarily with the contract_watcher packaging
package watcher
import (
"fmt"
"github.com/sirupsen/logrus"
"github.com/vulcanize/vulcanizedb/libraries/shared/transformer"
"github.com/vulcanize/vulcanizedb/pkg/core"
"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
)
type ContractWatcher struct {
Transformers []transformer.ContractTransformer
DB *postgres.DB
BlockChain core.BlockChain
}
func NewContractWatcher(db *postgres.DB, bc core.BlockChain) ContractWatcher {
return ContractWatcher{
DB: db,
BlockChain: bc,
}
}
func (watcher *ContractWatcher) AddTransformers(inits interface{}) error {
initializers, ok := inits.([]transformer.ContractTransformerInitializer)
if !ok {
return fmt.Errorf("initializers of type %T, not %T", inits, []transformer.ContractTransformerInitializer{})
}
for _, initializer := range initializers {
t := initializer(watcher.DB, watcher.BlockChain)
watcher.Transformers = append(watcher.Transformers, t)
}
for _, contractTransformer := range watcher.Transformers {
err := contractTransformer.Init()
if err != nil {
logrus.Print("Unable to initialize transformer:", contractTransformer.GetConfig().Name, err)
return err
}
}
return nil
}
func (watcher *ContractWatcher) Execute() error {
for _, contractTransformer := range watcher.Transformers {
err := contractTransformer.Execute()
if err != nil {
logrus.Error("Unable to execute transformer:", contractTransformer.GetConfig().Name, err)
return err
}
}
return nil
}