ipld-eth-server/pkg/plugin/writer/writer.go
2019-03-21 18:36:49 -05:00

126 lines
4.4 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/>.
package writer
import (
"errors"
"fmt"
. "github.com/dave/jennifer/jen"
"github.com/vulcanize/vulcanizedb/pkg/config"
"github.com/vulcanize/vulcanizedb/pkg/plugin/helpers"
)
// Interface for writing a .go file for a simple
// plugin that exports the set of transformer
// initializers specified in the config
type PluginWriter interface {
WritePlugin() error
}
type writer struct {
GenConfig config.Plugin
}
// Requires populated plugin config
func NewPluginWriter(gc config.Plugin) *writer {
return &writer{
GenConfig: gc,
}
}
// Generates the plugin code according to config specification
func (w *writer) WritePlugin() error {
// Setup plugin file paths
goFile, err := w.setupFilePath()
if err != nil {
return err
}
// Begin code generation
f := NewFile("main")
f.HeaderComment("This is a plugin generated to export the configured transformer initializers")
// Import pkgs for generic TransformerInitializer interface and specific TransformerInitializers specified in config
f.ImportAlias("github.com/vulcanize/vulcanizedb/libraries/shared/transformer", "interface")
for name, transformer := range w.GenConfig.Transformers {
f.ImportAlias(transformer.RepositoryPath+"/"+transformer.Path, name)
}
// Collect initializer code
code, err := w.collectTransformers()
if err != nil {
return err
}
// Create Exporter variable with method to export the set of the imported storage and event transformer initializers
f.Type().Id("exporter").String()
f.Var().Id("Exporter").Id("exporter")
f.Func().Params(Id("e").Id("exporter")).Id("Export").Params().Parens(List(
Index().Qual("github.com/vulcanize/vulcanizedb/libraries/shared/transformer", "EventTransformerInitializer"),
Index().Qual("github.com/vulcanize/vulcanizedb/libraries/shared/transformer", "StorageTransformerInitializer"),
Index().Qual("github.com/vulcanize/vulcanizedb/libraries/shared/transformer", "ContractTransformerInitializer"),
)).Block(Return(
Index().Qual(
"github.com/vulcanize/vulcanizedb/libraries/shared/transformer",
"EventTransformerInitializer").Values(code[config.EthEvent]...),
Index().Qual(
"github.com/vulcanize/vulcanizedb/libraries/shared/transformer",
"StorageTransformerInitializer").Values(code[config.EthStorage]...),
Index().Qual(
"github.com/vulcanize/vulcanizedb/libraries/shared/transformer",
"ContractTransformerInitializer").Values(code[config.EthContract]...))) // Exports the collected event and storage transformer initializers
// Write code to destination file
err = f.Save(goFile)
if err != nil {
return errors.New(fmt.Sprintf("failed to save generated .go file: %s\r\n%s", goFile, err.Error()))
}
return nil
}
// Collect code for various types of initializers
func (w *writer) collectTransformers() (map[config.TransformerType][]Code, error) {
code := make(map[config.TransformerType][]Code)
for _, transformer := range w.GenConfig.Transformers {
path := transformer.RepositoryPath + "/" + transformer.Path
switch transformer.Type {
case config.EthEvent:
code[config.EthEvent] = append(code[config.EthEvent], Qual(path, "EventTransformerInitializer"))
case config.EthStorage:
code[config.EthStorage] = append(code[config.EthStorage], Qual(path, "StorageTransformerInitializer"))
case config.EthContract:
code[config.EthContract] = append(code[config.EthContract], Qual(path, "ContractTransformerInitializer"))
default:
return nil, errors.New(fmt.Sprintf("invalid transformer type %s", transformer.Type))
}
}
return code, nil
}
// Setup the .go, clear old ones if present
func (w *writer) setupFilePath() (string, error) {
goFile, soFile, err := w.GenConfig.GetPluginPaths()
if err != nil {
return "", err
}
// Clear .go and .so files of the same name if they exist
return goFile, helpers.ClearFiles(goFile, soFile)
}