refactor: how to add a node type in workflow (#558)

backend/domain/workflow/internal/nodes/exit/exit.go

@@ -0,0 +1,113 @@
+/*
+ * Copyright 2025 coze-dev Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package exit
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/coze-dev/coze-studio/backend/domain/workflow/entity"
+	"github.com/coze-dev/coze-studio/backend/domain/workflow/entity/vo"
+	"github.com/coze-dev/coze-studio/backend/domain/workflow/internal/canvas/convert"
+	"github.com/coze-dev/coze-studio/backend/domain/workflow/internal/nodes"
+	"github.com/coze-dev/coze-studio/backend/domain/workflow/internal/nodes/emitter"
+	"github.com/coze-dev/coze-studio/backend/domain/workflow/internal/schema"
+)
+
+type Config struct {
+	Template      string
+	TerminatePlan vo.TerminatePlan
+}
+
+func (c *Config) Adapt(_ context.Context, n *vo.Node, _ ...nodes.AdaptOption) (*schema.NodeSchema, error) {
+	if n.Parent() != nil {
+		return nil, fmt.Errorf("exit node cannot have parent: %s", n.Parent().ID)
+	}
+
+	if n.ID != entity.ExitNodeKey {
+		return nil, fmt.Errorf("exit node id must be %s, got %s", entity.ExitNodeKey, n.ID)
+	}
+
+	ns := &schema.NodeSchema{
+		Key:     entity.ExitNodeKey,
+		Type:    entity.NodeTypeExit,
+		Name:    n.Data.Meta.Title,
+		Configs: c,
+	}
+
+	var (
+		content         *vo.BlockInput
+		streamingOutput bool
+	)
+	if n.Data.Inputs.OutputEmitter != nil {
+		content = n.Data.Inputs.Content
+		streamingOutput = n.Data.Inputs.StreamingOutput
+	}
+
+	if streamingOutput {
+		ns.StreamConfigs = &schema.StreamConfig{
+			RequireStreamingInput: true,
+		}
+	} else {
+		ns.StreamConfigs = &schema.StreamConfig{
+			RequireStreamingInput: false,
+		}
+	}
+
+	if content != nil {
+		if content.Type != vo.VariableTypeString {
+			return nil, fmt.Errorf("exit node's content type must be %s, got %s", vo.VariableTypeString, content.Type)
+		}
+
+		if content.Value.Type != vo.BlockInputValueTypeLiteral {
+			return nil, fmt.Errorf("exit node's content value type must be %s, got %s", vo.BlockInputValueTypeLiteral, content.Value.Type)
+		}
+
+		c.Template = content.Value.Content.(string)
+	}
+
+	if n.Data.Inputs.TerminatePlan == nil {
+		return nil, fmt.Errorf("exit node requires a TerminatePlan")
+	}
+	c.TerminatePlan = *n.Data.Inputs.TerminatePlan
+
+	if err := convert.SetInputsForNodeSchema(n, ns); err != nil {
+		return nil, err
+	}
+
+	return ns, nil
+}
+
+func (c *Config) Build(_ context.Context, ns *schema.NodeSchema, _ ...schema.BuildOption) (any, error) {
+	if c.TerminatePlan == vo.ReturnVariables {
+		return &Exit{}, nil
+	}
+
+	return &emitter.OutputEmitter{
+		Template:    c.Template,
+		FullSources: ns.FullSources,
+	}, nil
+}
+
+type Exit struct{}
+
+func (e *Exit) Invoke(_ context.Context, in map[string]any) (map[string]any, error) {
+	if in == nil {
+		return map[string]any{}, nil
+	}
+	return in, nil
+}