spanner/lar_trace.go

/*
Copyright 2026 Google LLC

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 spanner

import (
	"context"
	"encoding/hex"
	"fmt"
	"strings"

	"cloud.google.com/go/internal/trace"
	sppb "cloud.google.com/go/spanner/apiv1/spannerpb"
	"go.opentelemetry.io/otel/attribute"
	"google.golang.org/protobuf/encoding/protojson"
	"google.golang.org/protobuf/proto"
)

func larTraceEvent(ctx context.Context, eventName string, attrs ...attribute.KeyValue) {
	if ctx == nil {
		return
	}
	trace.TracePrintf(ctx, attrsToMap(attrs...), "%s", eventName)
}

func larProtoJSON(m proto.Message) string {
	if m == nil {
		return "{}"
	}
	out, err := protojson.MarshalOptions{
		UseProtoNames:   true,
		EmitUnpopulated: false,
		Multiline:       false,
	}.Marshal(m)
	if err != nil {
		return fmt.Sprintf("{\"marshal_error\":%q}", err.Error())
	}
	return string(out)
}

const (
	traceJSONChunkSize = 200
	traceJSONMaxChunks = 100
)

func larJSONPayloadAttrs(jsonPayload string) []attribute.KeyValue {
	if len(jsonPayload) <= traceJSONChunkSize {
		return []attribute.KeyValue{
			attribute.Int("payload_json_parts", 1),
			attribute.Int("payload_json_bytes", len(jsonPayload)),
			attribute.String("payload_json_part_000", jsonPayload),
		}
	}
	payloadBytes := []byte(jsonPayload)
	totalParts := (len(payloadBytes) + traceJSONChunkSize - 1) / traceJSONChunkSize
	partsToEmit := totalParts
	if partsToEmit > traceJSONMaxChunks {
		partsToEmit = traceJSONMaxChunks
	}
	attrs := []attribute.KeyValue{
		attribute.Int("payload_json_parts", totalParts),
		attribute.Int("payload_json_parts_emitted", partsToEmit),
		attribute.Int("payload_json_bytes", len(payloadBytes)),
	}
	for i := 0; i < partsToEmit; i++ {
		start := i * traceJSONChunkSize
		end := start + traceJSONChunkSize
		if end > len(payloadBytes) {
			end = len(payloadBytes)
		}
		attrs = append(attrs, attribute.String(fmt.Sprintf("payload_json_part_%03d", i), string(payloadBytes[start:end])))
	}
	if partsToEmit < totalParts {
		attrs = append(attrs, attribute.Bool("payload_json_partially_emitted", true))
	}
	return attrs
}

func larRoutingHintDecodedHex(req *sppb.ExecuteSqlRequest) string {
	if req == nil || req.GetRoutingHint() == nil {
		return ""
	}
	hint := req.GetRoutingHint()
	parts := []string{
		fmt.Sprintf("schema_generation_hex=%s", hex.EncodeToString(hint.GetSchemaGeneration())),
		fmt.Sprintf("key_hex=%s", hex.EncodeToString(hint.GetKey())),
		fmt.Sprintf("limit_key_hex=%s", hex.EncodeToString(hint.GetLimitKey())),
	}
	return strings.Join(parts, " ")
}

func attrsToMap(attrs ...attribute.KeyValue) map[string]interface{} {
	if len(attrs) == 0 {
		return nil
	}
	result := make(map[string]interface{}, len(attrs))
	for _, attr := range attrs {
		key := string(attr.Key)
		switch attr.Value.Type() {
		case attribute.BOOL:
			result[key] = attr.Value.AsBool()
		case attribute.INT64:
			result[key] = attr.Value.AsInt64()
		case attribute.FLOAT64:
			result[key] = attr.Value.AsFloat64()
		case attribute.STRING:
			result[key] = attr.Value.AsString()
		case attribute.BOOLSLICE:
			result[key] = attr.Value.AsBoolSlice()
		case attribute.INT64SLICE:
			result[key] = attr.Value.AsInt64Slice()
		case attribute.FLOAT64SLICE:
			result[key] = attr.Value.AsFloat64Slice()
		case attribute.STRINGSLICE:
			result[key] = attr.Value.AsStringSlice()
		default:
			result[key] = attr.Value.AsString()
		}
	}
	return result
}