/
loader.go
170 lines (147 loc) · 3.8 KB
/
loader.go
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package loader
import (
"fmt"
"os"
"strings"
coredag "github.com/ipfs/go-ipfs/core/coredag"
plugin "github.com/ipfs/go-ipfs/plugin"
fsrepo "github.com/ipfs/go-ipfs/repo/fsrepo"
opentracing "gx/ipfs/QmWLWmRVSiagqP15jczsGME1qpob6HDbtbHAY2he9W5iUo/opentracing-go"
coreiface "gx/ipfs/QmXLwxifxwfc2bAwq6rdjbYqAsGzWsDE9RM5TWMGtykyj6/interface-go-ipfs-core"
ipld "gx/ipfs/QmZ6nzCLwGLVfRzYLpD7pW6UNuBDKEcA2imJtVpbEx2rxy/go-ipld-format"
logging "gx/ipfs/QmbkT7eMTyXfpeyB3ZMxxcxg7XH8t6uXp49jqzz4HB7BGF/go-log"
)
var log = logging.Logger("plugin/loader")
var loadPluginsFunc = func(string) ([]plugin.Plugin, error) {
return nil, nil
}
// PluginLoader keeps track of loaded plugins
type PluginLoader struct {
plugins []plugin.Plugin
}
// NewPluginLoader creates new plugin loader
func NewPluginLoader(pluginDir string) (*PluginLoader, error) {
plMap := make(map[string]plugin.Plugin)
for _, v := range preloadPlugins {
plMap[v.Name()] = v
}
if pluginDir != "" {
newPls, err := loadDynamicPlugins(pluginDir)
if err != nil {
return nil, err
}
for _, pl := range newPls {
if ppl, ok := plMap[pl.Name()]; ok {
// plugin is already preloaded
return nil, fmt.Errorf(
"plugin: %s, is duplicated in version: %s, "+
"while trying to load dynamically: %s",
ppl.Name(), ppl.Version(), pl.Version())
}
plMap[pl.Name()] = pl
}
}
loader := &PluginLoader{plugins: make([]plugin.Plugin, 0, len(plMap))}
for _, v := range plMap {
loader.plugins = append(loader.plugins, v)
}
return loader, nil
}
func loadDynamicPlugins(pluginDir string) ([]plugin.Plugin, error) {
_, err := os.Stat(pluginDir)
if os.IsNotExist(err) {
return nil, nil
}
if err != nil {
return nil, err
}
return loadPluginsFunc(pluginDir)
}
// Initialize initializes all loaded plugins
func (loader *PluginLoader) Initialize() error {
for _, p := range loader.plugins {
err := p.Init()
if err != nil {
return err
}
}
return nil
}
// Inject hooks all the plugins into the appropriate subsystems.
func (loader *PluginLoader) Inject() error {
for _, pl := range loader.plugins {
if pl, ok := pl.(plugin.PluginIPLD); ok {
err := injectIPLDPlugin(pl)
if err != nil {
return err
}
}
if pl, ok := pl.(plugin.PluginTracer); ok {
err := injectTracerPlugin(pl)
if err != nil {
return err
}
}
if pl, ok := pl.(plugin.PluginDatastore); ok {
err := injectDatastorePlugin(pl)
if err != nil {
return err
}
}
}
return nil
}
// Start starts all long-running plugins.
func (loader *PluginLoader) Start(iface coreiface.CoreAPI) error {
for i, pl := range loader.plugins {
if pl, ok := pl.(plugin.PluginDaemon); ok {
err := pl.Start(iface)
if err != nil {
closePlugins(loader.plugins[i:])
return err
}
}
}
return nil
}
// StopDaemon stops all long-running plugins.
func (loader *PluginLoader) Close() error {
return closePlugins(loader.plugins)
}
func closePlugins(plugins []plugin.Plugin) error {
var errs []string
for _, pl := range plugins {
if pl, ok := pl.(plugin.PluginDaemon); ok {
err := pl.Close()
if err != nil {
errs = append(errs, fmt.Sprintf(
"error closing plugin %s: %s",
pl.Name(),
err.Error(),
))
}
}
}
if errs != nil {
return fmt.Errorf(strings.Join(errs, "\n"))
}
return nil
}
func injectDatastorePlugin(pl plugin.PluginDatastore) error {
return fsrepo.AddDatastoreConfigHandler(pl.DatastoreTypeName(), pl.DatastoreConfigParser())
}
func injectIPLDPlugin(pl plugin.PluginIPLD) error {
err := pl.RegisterBlockDecoders(ipld.DefaultBlockDecoder)
if err != nil {
return err
}
return pl.RegisterInputEncParsers(coredag.DefaultInputEncParsers)
}
func injectTracerPlugin(pl plugin.PluginTracer) error {
tracer, err := pl.InitTracer()
if err != nil {
return err
}
opentracing.SetGlobalTracer(tracer)
return nil
}