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database.go
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database.go
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// Copyright (c) 2019 The Jaeger Authors.
// Copyright (c) 2017 Uber Technologies, Inc.
//
// 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 customer
import (
"context"
"errors"
"fmt"
"go.opentelemetry.io/otel/attribute"
semconv "go.opentelemetry.io/otel/semconv/v1.20.0"
"go.opentelemetry.io/otel/trace"
"go.uber.org/zap"
"github.com/jaegertracing/jaeger/examples/hotrod/pkg/delay"
"github.com/jaegertracing/jaeger/examples/hotrod/pkg/log"
"github.com/jaegertracing/jaeger/examples/hotrod/pkg/tracing"
"github.com/jaegertracing/jaeger/examples/hotrod/services/config"
)
// database simulates Customer repository implemented on top of an SQL database
type database struct {
tracer trace.Tracer
logger log.Factory
customers map[int]*Customer
lock *tracing.Mutex
}
func newDatabase(tracer trace.Tracer, logger log.Factory) *database {
return &database{
tracer: tracer,
logger: logger,
lock: &tracing.Mutex{
SessionBaggageKey: "request",
LogFactory: logger,
},
customers: map[int]*Customer{
123: {
ID: "123",
Name: "Rachel's_Floral_Designs",
Location: "115,277",
},
567: {
ID: "567",
Name: "Amazing_Coffee_Roasters",
Location: "211,653",
},
392: {
ID: "392",
Name: "Trom_Chocolatier",
Location: "577,322",
},
731: {
ID: "731",
Name: "Japanese_Desserts",
Location: "728,326",
},
},
}
}
func (d *database) Get(ctx context.Context, customerID int) (*Customer, error) {
d.logger.For(ctx).Info("Loading customer", zap.Int("customer_id", customerID))
ctx, span := d.tracer.Start(ctx, "SQL SELECT", trace.WithSpanKind(trace.SpanKindClient))
span.SetAttributes(
semconv.PeerServiceKey.String("mysql"),
attribute.
Key("sql.query").
String(fmt.Sprintf("SELECT * FROM customer WHERE customer_id=%d", customerID)),
)
defer span.End()
if !config.MySQLMutexDisabled {
// simulate misconfigured connection pool that only gives one connection at a time
d.lock.Lock(ctx)
defer d.lock.Unlock()
}
// simulate RPC delay
delay.Sleep(config.MySQLGetDelay, config.MySQLGetDelayStdDev)
if customer, ok := d.customers[customerID]; ok {
return customer, nil
}
return nil, errors.New("invalid customer ID")
}