ipld-eth-server/cmd/composeAndExecute.go
2019-02-24 21:38:47 -06:00

161 lines
5.0 KiB
Go

// Copyright © 2019 Vulcanize, Inc
//
// 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 cmd
import (
"fmt"
"log"
"os"
"plugin"
"time"
"github.com/spf13/cobra"
"github.com/spf13/viper"
"github.com/vulcanize/vulcanizedb/libraries/shared/transformer"
"github.com/vulcanize/vulcanizedb/libraries/shared/watcher"
"github.com/vulcanize/vulcanizedb/pkg/config"
p2 "github.com/vulcanize/vulcanizedb/pkg/plugin"
"github.com/vulcanize/vulcanizedb/pkg/plugin/helpers"
"github.com/vulcanize/vulcanizedb/utils"
)
// executePluginCmd represents the execute command
var composeAndExecuteCmd = &cobra.Command{
Use: "composeAndExecute",
Short: "Composes, loads, and executes transformer initializer plugin",
Long: `This command needs a config .toml file of form:
[database]
name = "vulcanize_public"
hostname = "localhost"
user = "vulcanize"
password = "vulcanize"
port = 5432
[client]
ipcPath = "http://kovan0.vulcanize.io:8545"
[exporter]
name = "exporter"
[exporter.transformers]
transformer1 = "github.com/path/to/transformer1"
transformer2 = "github.com/path/to/transformer2"
transformer3 = "github.com/path/to/transformer3"
transformer4 = "github.com/different/path/to/transformer1"
[exporter.repositories]
transformers = "github.com/path/to"
transformer4 = "github.com/different/path
[exporter.migrations]
transformers = "db/migrations"
transformer4 = "to/db/migrations"
Note: If any of the imported transformer need additional
config variables do not forget to include those as well
This information is used to write and build a .so with an arbitrary transformer
set composed from the transformer imports specified in the config file
This .so is loaded as a plugin and the set of transformer initializers is
loaded into and executed over by a generic watcher`,
Run: func(cmd *cobra.Command, args []string) {
composeAndExecute()
},
}
func composeAndExecute() {
// generate code to build the plugin according to the config file
genConfig = config.Plugin{
FilePath: "$GOPATH/src/github.com/vulcanize/vulcanizedb/plugins",
FileName: viper.GetString("exporter.name"),
Save: viper.GetBool("exporter.save"),
Initializers: viper.GetStringMapString("exporter.transformers"),
Dependencies: viper.GetStringMapString("exporter.repositories"),
Migrations: viper.GetStringMapString("exporter.migrations"),
}
fmt.Println("generating plugin")
generator, err := p2.NewGenerator(genConfig, databaseConfig)
if err != nil {
log.Fatal(err)
}
err = generator.GenerateExporterPlugin()
if err != nil {
fmt.Fprint(os.Stderr, "generating plugin failed")
log.Fatal(err)
}
// Get the plugin path and load the plugin
_, pluginPath, err := genConfig.GetPluginPaths()
if err != nil {
log.Fatal(err)
}
if !genConfig.Save {
defer helpers.ClearFiles(pluginPath)
}
fmt.Println("opening plugin")
plug, err := plugin.Open(pluginPath)
if err != nil {
fmt.Fprint(os.Stderr, "opening pluggin failed")
log.Fatal(err)
}
// Load the `Exporter` symbol from the plugin
fmt.Println("loading transformers from plugin")
symExporter, err := plug.Lookup("Exporter")
if err != nil {
fmt.Fprint(os.Stderr, "loading Exporter symbol failed")
log.Fatal(err)
}
// Assert that the symbol is of type Exporter
exporter, ok := symExporter.(Exporter)
if !ok {
fmt.Fprint(os.Stderr, "plugged-in symbol not of type Exporter")
os.Exit(1)
}
// Use the Exporters export method to load the TransformerInitializer set
initializers := exporter.Export()
// Setup bc and db objects
blockChain := getBlockChain()
db := utils.LoadPostgres(databaseConfig, blockChain.Node())
// Create a watcher and load the TransformerInitializer set into it
w := watcher.NewWatcher(&db, blockChain)
w.AddTransformers(initializers)
// Execute over the TransformerInitializer set using the watcher
fmt.Println("executing transformers")
ticker := time.NewTicker(pollingInterval)
defer ticker.Stop()
for range ticker.C {
err := w.Execute()
if err != nil {
// TODO Handle watcher errors in composeAndExecute
}
}
}
type Exporter interface {
Export() []transformer.TransformerInitializer
}
func init() {
rootCmd.AddCommand(composeAndExecuteCmd)
composeAndExecuteCmd.Flags().Int64VarP(&startingBlockNumber, "starting-block-number", "s", 0, "Block number to start transformer execution from")
}