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Merge pull request #4806 from PlayerWithoutName/feat/plugins/loader
Stateful plugin loading
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,125 @@ | ||
| package loader | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "github.com/ipfs/go-ipfs/core/coredag" | ||
| "github.com/ipfs/go-ipfs/plugin" | ||
| "github.com/ipfs/go-ipfs/repo/fsrepo" | ||
| "os" | ||
|
|
||
| opentracing "gx/ipfs/QmWLWmRVSiagqP15jczsGME1qpob6HDbtbHAY2he9W5iUo/opentracing-go" | ||
| ipld "gx/ipfs/QmcKKBwfz6FyQdHR2jsXrrF6XeSBXYL86anmWNewpFpoF5/go-ipld-format" | ||
| logging "gx/ipfs/QmcuXC5cxs79ro2cUuHs4HQ2bkDLJUYokwL8aivcX6HW3C/go-log" | ||
| ) | ||
|
|
||
| var log = logging.Logger("plugin/loader") | ||
|
|
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| var loadPluginsFunc = func(string) ([]plugin.Plugin, error) { | ||
| return nil, nil | ||
| } | ||
|
|
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| // PluginLoader keeps track of loaded plugins | ||
| type PluginLoader struct { | ||
| plugins []plugin.Plugin | ||
| } | ||
|
|
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| // 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 all loaded plugins | ||
| func (loader *PluginLoader) Initialize() error { | ||
| for _, p := range loader.plugins { | ||
| err := p.Init() | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| //Run the plugins | ||
| func (loader *PluginLoader) Run() error { | ||
| for _, pl := range loader.plugins { | ||
| switch pl := pl.(type) { | ||
| case plugin.PluginIPLD: | ||
| err := runIPLDPlugin(pl) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| case plugin.PluginTracer: | ||
| err := runTracerPlugin(pl) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| case plugin.PluginDatastore: | ||
| err := fsrepo.AddDatastoreConfigHandler(pl.DatastoreTypeName(), pl.DatastoreConfigParser()) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| default: | ||
| panic(pl) | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func runIPLDPlugin(pl plugin.PluginIPLD) error { | ||
| err := pl.RegisterBlockDecoders(ipld.DefaultBlockDecoder) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| return pl.RegisterInputEncParsers(coredag.DefaultInputEncParsers) | ||
| } | ||
|
|
||
| func runTracerPlugin(pl plugin.PluginTracer) error { | ||
| tracer, err := pl.InitTracer() | ||
| if err != nil { | ||
| return err | ||
| } | ||
| opentracing.SetGlobalTracer(tracer) | ||
| return nil | ||
| } |
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