125 lines
4.4 KiB
Go
125 lines
4.4 KiB
Go
// VulcanizeDB
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// Copyright © 2019 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 writer
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import (
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"fmt"
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. "github.com/dave/jennifer/jen"
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"github.com/vulcanize/vulcanizedb/pkg/config"
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"github.com/vulcanize/vulcanizedb/pkg/plugin/helpers"
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)
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// Interface for writing a .go file for a simple
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// plugin that exports the set of transformer
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// initializers specified in the config
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type PluginWriter interface {
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WritePlugin() error
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}
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type writer struct {
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GenConfig config.Plugin
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}
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// Requires populated plugin config
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func NewPluginWriter(gc config.Plugin) PluginWriter {
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return &writer{
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GenConfig: gc,
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}
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}
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// Generates the plugin code according to config specification
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func (w *writer) WritePlugin() error {
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// Setup plugin file paths
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goFile, err := w.setupFilePath()
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if err != nil {
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return err
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}
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// Begin code generation
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f := NewFile("main")
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f.HeaderComment("This is a plugin generated to export the configured transformer initializers")
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// Import pkgs for generic TransformerInitializer interface and specific TransformerInitializers specified in config
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f.ImportAlias("github.com/vulcanize/vulcanizedb/libraries/shared/transformer", "interface")
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for name, transformer := range w.GenConfig.Transformers {
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f.ImportAlias(transformer.RepositoryPath+"/"+transformer.Path, name)
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}
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// Collect initializer code
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code, err := w.collectTransformers()
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if err != nil {
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return err
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}
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// Create Exporter variable with method to export the set of the imported storage and event transformer initializers
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f.Type().Id("exporter").String()
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f.Var().Id("Exporter").Id("exporter")
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f.Func().Params(Id("e").Id("exporter")).Id("Export").Params().Parens(List(
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Index().Qual("github.com/vulcanize/vulcanizedb/libraries/shared/transformer", "EventTransformerInitializer"),
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Index().Qual("github.com/vulcanize/vulcanizedb/libraries/shared/transformer", "StorageTransformerInitializer"),
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Index().Qual("github.com/vulcanize/vulcanizedb/libraries/shared/transformer", "ContractTransformerInitializer"),
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)).Block(Return(
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Index().Qual(
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"github.com/vulcanize/vulcanizedb/libraries/shared/transformer",
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"EventTransformerInitializer").Values(code[config.EthEvent]...),
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Index().Qual(
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"github.com/vulcanize/vulcanizedb/libraries/shared/transformer",
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"StorageTransformerInitializer").Values(code[config.EthStorage]...),
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Index().Qual(
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"github.com/vulcanize/vulcanizedb/libraries/shared/transformer",
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"ContractTransformerInitializer").Values(code[config.EthContract]...))) // Exports the collected event and storage transformer initializers
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// Write code to destination file
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err = f.Save(goFile)
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if err != nil {
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return fmt.Errorf("failed to save generated .go file: %s\r\n%s", goFile, err.Error())
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}
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return nil
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}
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// Collect code for various types of initializers
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func (w *writer) collectTransformers() (map[config.TransformerType][]Code, error) {
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code := make(map[config.TransformerType][]Code)
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for _, transformer := range w.GenConfig.Transformers {
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path := transformer.RepositoryPath + "/" + transformer.Path
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switch transformer.Type {
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case config.EthEvent:
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code[config.EthEvent] = append(code[config.EthEvent], Qual(path, "EventTransformerInitializer"))
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case config.EthStorage:
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code[config.EthStorage] = append(code[config.EthStorage], Qual(path, "StorageTransformerInitializer"))
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case config.EthContract:
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code[config.EthContract] = append(code[config.EthContract], Qual(path, "ContractTransformerInitializer"))
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default:
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return nil, fmt.Errorf("invalid transformer type %s", transformer.Type)
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}
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}
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return code, nil
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}
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// Setup the .go, clear old ones if present
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func (w *writer) setupFilePath() (string, error) {
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goFile, soFile, err := w.GenConfig.GetPluginPaths()
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if err != nil {
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return "", err
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}
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// Clear .go and .so files of the same name if they exist
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return goFile, helpers.ClearFiles(goFile, soFile)
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}
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