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Go

/*
* Copyright 2025 CloudWeGo 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 trace
import (
"context"
"log"
"os"
ccb "github.com/cloudwego/eino-ext/callbacks/cozeloop"
"github.com/cloudwego/eino/callbacks"
"github.com/coze-dev/cozeloop-go"
)
type CloseFn func(ctx context.Context)
type (
EndSpanFn func(ctx context.Context, output any)
StartSpanFn func(ctx context.Context, name string, input any) (nCtx context.Context, endFn EndSpanFn)
)
func AppendCozeLoopCallbackIfConfigured(_ context.Context) (closeFn CloseFn, startSpanFn StartSpanFn) {
// setup cozeloop
// COZELOOP_WORKSPACE_ID=your workspace id
// COZELOOP_API_TOKEN=your token
wsID := os.Getenv("COZELOOP_WORKSPACE_ID") // use cozeloop trace, from https://loop.coze.cn/open/docs/cozeloop/go-sdk#4a8c980e
apiKey := os.Getenv("COZELOOP_API_TOKEN")
if wsID == "" || apiKey == "" {
return func(ctx context.Context) {}, buildStartSpanFn(nil)
}
client, err := cozeloop.NewClient(
cozeloop.WithWorkspaceID(wsID),
cozeloop.WithAPIToken(apiKey),
)
if err != nil {
log.Fatalf("cozeloop.NewClient failed, err: %v", err)
}
// init once
handler := ccb.NewLoopHandler(client)
callbacks.AppendGlobalHandlers(handler)
return client.Close, buildStartSpanFn(client)
}
func buildStartSpanFn(client cozeloop.Client) StartSpanFn {
return func(ctx context.Context, name string, input any) (nCtx context.Context, endFn EndSpanFn) {
if client == nil {
return ctx, func(ctx context.Context, output any) {}
}
nCtx, span := client.StartSpan(ctx, name, "custom")
span.SetInput(ctx, input)
return nCtx, buildEndSpanFn(span)
}
}
func buildEndSpanFn(span cozeloop.Span) EndSpanFn {
return func(ctx context.Context, output any) {
if span == nil {
return
}
span.SetOutput(ctx, output)
span.Finish(ctx)
}
}