feat: manually mirror opencoze's code from bytedance

Change-Id: I09a73aadda978ad9511264a756b2ce51f5761adf

backend/domain/workflow/internal/execute/event.go

@@ -0,0 +1,120 @@
+/*
+ * 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 execute
+
+import (
+	"time"
+
+	"github.com/coze-dev/coze-studio/backend/domain/workflow/entity"
+)
+
+type EventType string
+
+const (
+	WorkflowStart         EventType = "workflow_start"
+	WorkflowSuccess       EventType = "workflow_success"
+	WorkflowFailed        EventType = "workflow_failed"
+	WorkflowCancel        EventType = "workflow_cancel"
+	WorkflowInterrupt     EventType = "workflow_interrupt"
+	WorkflowResume        EventType = "workflow_resume"
+	NodeStart             EventType = "node_start"
+	NodeEnd               EventType = "node_end"
+	NodeEndStreaming      EventType = "node_end_streaming" // absolutely end, after all streaming content are sent
+	NodeError             EventType = "node_error"
+	NodeStreamingInput    EventType = "node_streaming_input"
+	NodeStreamingOutput   EventType = "node_streaming_output"
+	FunctionCall          EventType = "function_call"
+	ToolResponse          EventType = "tool_response"
+	ToolStreamingResponse EventType = "tool_streaming_response"
+	ToolError             EventType = "tool_error"
+)
+
+type Event struct {
+	Type EventType
+
+	*Context
+
+	Duration time.Duration
+	Input    map[string]any
+	Output   map[string]any
+
+	// if the node is output_emitter or exit node with answer as terminate plan, this field will be set.
+	// it contains the incremental change in the output.
+	Answer    string
+	StreamEnd bool
+
+	RawOutput map[string]any
+
+	Err   error
+	Token *TokenInfo
+
+	InterruptEvents []*entity.InterruptEvent
+
+	functionCall *entity.FunctionCallInfo
+	toolResponse *entity.ToolResponseInfo
+
+	outputExtractor func(o map[string]any) string
+	extra           *entity.NodeExtra
+
+	done chan struct{}
+
+	nodeCount int32
+}
+
+type TokenInfo struct {
+	InputToken  int64
+	OutputToken int64
+	TotalToken  int64
+}
+
+func (e *Event) GetInputTokens() int64 {
+	if e.Token == nil {
+		return 0
+	}
+	return e.Token.InputToken
+}
+
+func (e *Event) GetOutputTokens() int64 {
+	if e.Token == nil {
+		return 0
+	}
+	return e.Token.OutputToken
+}
+
+func (e *Event) GetResumedEventID() int64 {
+	if e.Context == nil {
+		return 0
+	}
+	if e.Context.RootCtx.ResumeEvent == nil {
+		return 0
+	}
+	return e.Context.RootCtx.ResumeEvent.ID
+}
+
+func (e *Event) GetFunctionCallInfo() (*entity.FunctionCallInfo, bool) {
+	if e.functionCall == nil {
+		return nil, false
+	}
+	return e.functionCall, true
+}
+
+func (e *Event) GetToolResponse() (*entity.ToolResponseInfo, bool) {
+	if e.toolResponse == nil {
+		return nil, false
+	}
+	return e.toolResponse, true
+}