Basic plugin system with centralized registry

example/pluggable/.gitignore

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+/bin

example/pluggable/Makefile

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+build: extension
+	go build -o ./bin/app ./
+
+extension:
+	go build  -o ./bin/myplugin.so -buildmode=plugin ./myplugin
+
+watch:
+	modd
+
+run:
+	./bin/app

example/pluggable/hook/initializable.go

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+package hook
+
+type Initializable interface {
+	HookInit() error
+}

example/pluggable/main.go

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+package main
+
+import (
+	"context"
+	"log"
+
+	"github.com/pkg/errors"
+	"gitlab.com/wpetit/goweb/example/pluggable/hook"
+	"gitlab.com/wpetit/goweb/plugin"
+)
+
+func main() {
+	reg := plugin.NewRegistry()
+	ctx := context.Background()
+
+	_, err := reg.LoadAll(ctx, "./bin/*.so")
+	if err != nil {
+		log.Fatal(errors.WithStack(err))
+	}
+
+	for _, ext := range reg.Plugins() {
+		log.Printf("Loaded plugin '%s', version '%s'", ext.PluginName(), ext.PluginVersion())
+	}
+
+	// Iterate over plugins
+	err = reg.Each(func(p plugin.Plugin) error {
+		h, ok := p.(hook.Initializable)
+		if !ok {
+			// Skip non initializable plugins
+			return nil
+		}
+
+		// Initialize plugin
+		if err := h.HookInit(); err != nil {
+			return errors.WithStack(err)
+		}
+
+		return nil
+	})
+
+	if err != nil {
+		log.Fatal(errors.WithStack(err))
+	}
+}

example/pluggable/modd.conf

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+**/*.go
+modd.conf
+Makefile {
+    prep: make build
+    prep: make run
+}

example/pluggable/myplugin/main.go

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+package main
+
+import (
+	"context"
+
+	"gitlab.com/wpetit/goweb/plugin"
+)
+
+func RegisterPlugin(ctx context.Context) (plugin.Plugin, error) {
+	return &MyPlugin{}, nil
+}

example/pluggable/myplugin/plugin.go

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+package main
+
+import "log"
+
+type MyPlugin struct{}
+
+func (e *MyPlugin) PluginName() string {
+	return "my.plugin"
+}
+
+func (e *MyPlugin) PluginVersion() string {
+	return "0.0.0"
+}
+
+func (e *MyPlugin) HookInit() error {
+	log.Println("MyPlugin initialized !")
+
+	return nil
+}