generic transformer and watcher interfaces for plugging in transformers built from omni pkging

This commit is contained in:
Ian Norden 2019-03-11 11:20:22 -05:00
parent 8174ce4aee
commit 5101ed4369
2 changed files with 108 additions and 0 deletions

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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 transformer
import (
"github.com/vulcanize/vulcanizedb/pkg/config"
"github.com/vulcanize/vulcanizedb/pkg/core"
"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
)
type GenericTransformer interface {
Init() error
Execute() error
GetConfig() config.ContractConfig
}
type GenericTransformerInitializer func(db *postgres.DB, bc core.BlockChain) GenericTransformer

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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/>.
// Dynamic watcher is built with a more generic interface
// that allows offloading more of the operatinal logic to
// the transformers, allowing them to act more dynamically
// Built to work primarily with the omni pkging
package watcher
import (
"fmt"
log "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 GenericWatcher struct {
Transformers []transformer.GenericTransformer
DB *postgres.DB
BlockChain core.BlockChain
}
func NewGenericWatcher(db *postgres.DB, bc core.BlockChain) *GenericWatcher {
return &GenericWatcher{
DB: db,
BlockChain: bc,
}
}
func (watcher *GenericWatcher) AddTransformers(inits interface{}) error {
initializers, ok := inits.([]transformer.GenericTransformerInitializer)
if !ok {
return fmt.Errorf("initializers of type %T, not %T", inits, []transformer.GenericTransformerInitializer{})
}
watcher.Transformers = make([]transformer.GenericTransformer, 0, len(initializers))
for _, initializer := range initializers {
t := initializer(watcher.DB, watcher.BlockChain)
watcher.Transformers = append(watcher.Transformers, t)
}
for _, transformer := range watcher.Transformers {
err := transformer.Init()
if err != nil {
log.Print("Unable to initialize transformer:", transformer.GetConfig().Name, err)
return err
}
}
return nil
}
func (watcher *GenericWatcher) Execute(interface{}) error {
for _, transformer := range watcher.Transformers {
err := transformer.Execute()
if err != nil {
log.Error("Unable to execute transformer:", transformer.GetConfig().Name, err)
return err
}
}
return nil
}