Add custom actions with golang interpreter

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

agent/actions_custom.go

@@ -0,0 +1,126 @@
+package agent
+
+import (
+	"context"
+	"fmt"
+	"strings"
+
+	"github.com/mudler/local-agent-framework/action"
+	"github.com/mudler/local-agent-framework/xlog"
+	"github.com/sashabaranov/go-openai/jsonschema"
+	"github.com/traefik/yaegi/interp"
+	"github.com/traefik/yaegi/stdlib"
+)
+
+func NewCustom(config map[string]string, goPkgPath string) (*CustomAction, error) {
+	a := &CustomAction{
+		config:    config,
+		goPkgPath: goPkgPath,
+	}
+
+	if err := a.initializeInterpreter(); err != nil {
+		return nil, err
+	}
+
+	if err := a.callInit(); err != nil {
+		xlog.Error("Error calling custom action init", "error", err)
+	}
+
+	return a, nil
+}
+
+type CustomAction struct {
+	config    map[string]string
+	goPkgPath string
+	i         *interp.Interpreter
+}
+
+func (a *CustomAction) callInit() error {
+	if a.i == nil {
+		return nil
+	}
+
+	v, err := a.i.Eval(fmt.Sprintf("%s.Init", a.config["name"]))
+	if err != nil {
+		return err
+	}
+
+	run := v.Interface().(func() error)
+
+	return run()
+}
+
+func (a *CustomAction) initializeInterpreter() error {
+	if _, exists := a.config["code"]; exists && a.i == nil {
+		unsafe := strings.ToLower(a.config["unsafe"]) == "true"
+		i := interp.New(interp.Options{
+			GoPath:       a.goPkgPath,
+			Unrestricted: unsafe,
+		})
+		if err := i.Use(stdlib.Symbols); err != nil {
+			return err
+		}
+
+		if _, exists := a.config["name"]; !exists {
+			a.config["name"] = "custom"
+		}
+
+		_, err := i.Eval(fmt.Sprintf("package %s\n%s", a.config["name"], a.config["code"]))
+		if err != nil {
+			return err
+		}
+
+		a.i = i
+	}
+
+	return nil
+}
+
+func (a *CustomAction) Run(ctx context.Context, params action.ActionParams) (string, error) {
+	v, err := a.i.Eval(fmt.Sprintf("%s.Run", a.config["name"]))
+	if err != nil {
+		return "", err
+	}
+
+	run := v.Interface().(func(map[string]interface{}) (string, error))
+
+	return run(params)
+}
+
+func (a *CustomAction) Definition() action.ActionDefinition {
+
+	v, err := a.i.Eval(fmt.Sprintf("%s.Definition", a.config["name"]))
+	if err != nil {
+		xlog.Error("Error getting custom action definition", "error", err)
+		return action.ActionDefinition{}
+	}
+
+	properties := v.Interface().(func() map[string][]string)
+
+	v, err = a.i.Eval(fmt.Sprintf("%s.RequiredFields", a.config["name"]))
+	if err != nil {
+		xlog.Error("Error getting custom action definition", "error", err)
+		return action.ActionDefinition{}
+	}
+
+	requiredFields := v.Interface().(func() []string)
+
+	prop := map[string]jsonschema.Definition{}
+
+	for k, v := range properties() {
+		if len(v) != 2 {
+			xlog.Error("Invalid property definition", "property", k)
+			continue
+		}
+		prop[k] = jsonschema.Definition{
+			Type:        jsonschema.DataType(v[0]),
+			Description: v[1],
+		}
+	}
+	return action.ActionDefinition{
+		Name:        action.ActionDefinitionName(a.config["name"]),
+		Description: a.config["description"],
+		Properties:  prop,
+		Required:    requiredFields(),
+	}
+}

agent/actions_custom_test.go

@@ -0,0 +1,87 @@
+package agent_test
+
+import (
+	"context"
+
+	"github.com/mudler/local-agent-framework/action"
+	. "github.com/mudler/local-agent-framework/agent"
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
+
+	"github.com/sashabaranov/go-openai/jsonschema"
+)
+
+var _ = Describe("Agent custom action", func() {
+	Context("custom action", func() {
+		It("initializes correctly", func() {
+
+			testCode := `
+
+import (
+	"encoding/json"
+)
+type Params struct {
+	Foo string
+}
+
+func Run(config map[string]interface{}) (string, error) {
+
+p := Params{}
+b, err := json.Marshal(config)
+	if err != nil {
+		return "", err
+	}
+if err := json.Unmarshal(b, &p); err != nil {
+	return "", err
+}
+
+return p.Foo, nil
+}
+
+func Definition() map[string][]string {
+return map[string][]string{
+	"foo": []string{
+		"string",
+		"The foo value",
+		},
+	}
+}
+
+func RequiredFields() []string {
+return []string{"foo"}
+}
+
+			`
+
+			customAction, err := NewCustom(
+				map[string]string{
+					"code":        testCode,
+					"name":        "test",
+					"description": "A test action",
+				},
+				"",
+			)
+			Expect(err).ToNot(HaveOccurred())
+
+			definition := customAction.Definition()
+			Expect(definition).To(Equal(action.ActionDefinition{
+				Properties: map[string]jsonschema.Definition{
+					"foo": {
+						Type:        jsonschema.String,
+						Description: "The foo value",
+					},
+				},
+				Required:    []string{"foo"},
+				Name:        "test",
+				Description: "A test action",
+			}))
+
+			runResult, err := customAction.Run(context.Background(), action.ActionParams{
+				"Foo": "bar",
+			})
+			Expect(err).ToNot(HaveOccurred())
+			Expect(runResult).To(Equal("bar"))
+
+		})
+	})
+})