forked from cerc-io/ipld-eth-server
132 lines
3.7 KiB
Go
132 lines
3.7 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 builder
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import (
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"fmt"
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"os"
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"os/exec"
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"path/filepath"
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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 compile Go code written by the
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// PluginWriter into a shared object (.so file)
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// which can be used loaded as a plugin
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type PluginBuilder interface {
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BuildPlugin() error
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CleanUp() error
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}
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type builder struct {
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GenConfig config.Plugin
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dependencies []string
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tmpVenDirs []string // Keep track of temp vendor directories
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goFile string // Keep track of goFile name
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}
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// Requires populated plugin config
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func NewPluginBuilder(gc config.Plugin) *builder {
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return &builder{
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GenConfig: gc,
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tmpVenDirs: make([]string, 0),
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}
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}
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func (b *builder) BuildPlugin() error {
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// Get plugin .go and .so file paths
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var err error
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var soFile string
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b.goFile, soFile, err = b.GenConfig.GetPluginPaths()
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if err != nil {
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return err
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}
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// setup env to build plugin
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setupErr := b.setupBuildEnv()
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if setupErr != nil {
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return setupErr
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}
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// Build the .go file into a .so plugin
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execErr := exec.Command("go", "build", "-buildmode=plugin", "-o", soFile, b.goFile).Run()
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if execErr != nil {
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return fmt.Errorf("unable to build .so file: %s", execErr.Error())
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}
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return nil
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}
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// Sets up temporary vendor libs needed for plugin build
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// This is to work around a conflict between plugins and vendoring (https://github.com/golang/go/issues/20481)
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func (b *builder) setupBuildEnv() error {
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// TODO: Less hacky way of handling plugin build deps
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vendorPath, err := helpers.CleanPath(filepath.Join("$GOPATH/src", b.GenConfig.Home, "vendor"))
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if err != nil {
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return err
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}
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repoPaths := b.GenConfig.GetRepoPaths()
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// Import transformer dependencies so that we can build our plugin
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for importPath := range repoPaths {
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dst := filepath.Join(vendorPath, importPath)
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src, cleanErr := helpers.CleanPath(filepath.Join("$GOPATH/src", importPath))
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if cleanErr != nil {
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return cleanErr
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}
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copyErr := helpers.CopyDir(src, dst, "vendor")
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if copyErr != nil {
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return fmt.Errorf("unable to copy transformer dependency from %s to %s: %v", src, dst, copyErr)
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}
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// Have to clear out the copied over vendor lib or plugin won't build (see issue above)
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removeErr := os.RemoveAll(filepath.Join(dst, "vendor"))
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if removeErr != nil {
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return removeErr
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}
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// Keep track of this vendor directory to clear later
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b.tmpVenDirs = append(b.tmpVenDirs, dst)
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}
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return nil
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}
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// Used to clear all of the tmp vendor libs used to build the plugin
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// Also clears the go file if saving it has not been specified in the config
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// Do not call until after the MigrationManager has performed its operations
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// as it needs to pull the db migrations from the tmpVenDirs
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func (b *builder) CleanUp() error {
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if !b.GenConfig.Save {
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err := helpers.ClearFiles(b.goFile)
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if err != nil {
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return err
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}
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}
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for _, venDir := range b.tmpVenDirs {
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err := os.RemoveAll(venDir)
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if err != nil {
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return err
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}
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}
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return nil
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}
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