forked from jaegertracing/jaeger
/
database.go
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/
database.go
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// Copyright (c) 2017 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package customer
import (
"context"
"errors"
"go.uber.org/zap"
"github.com/opentracing/opentracing-go"
tags "github.com/opentracing/opentracing-go/ext"
"github.com/uber/jaeger/examples/hotrod/pkg/delay"
"github.com/uber/jaeger/examples/hotrod/pkg/log"
"github.com/uber/jaeger/examples/hotrod/pkg/tracing"
"github.com/uber/jaeger/examples/hotrod/services/config"
)
// database simulates Customer repository implemented on top of an SQL database
type database struct {
tracer opentracing.Tracer
logger log.Factory
customers map[string]*Customer
lock *tracing.Mutex
}
func newDatabase(tracer opentracing.Tracer, logger log.Factory) *database {
return &database{
tracer: tracer,
logger: logger,
lock: &tracing.Mutex{
SessionBaggageKey: "request",
},
customers: map[string]*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 Deserts",
Location: "728,326",
},
},
}
}
func (d *database) Get(ctx context.Context, customerID string) (*Customer, error) {
d.logger.For(ctx).Info("Loading customer", zap.String("customer_id", customerID))
// simulate opentracing instrumentation of an SQL query
if span := opentracing.SpanFromContext(ctx); span != nil {
span := d.tracer.StartSpan("SQL SELECT", opentracing.ChildOf(span.Context()))
tags.SpanKindRPCClient.Set(span)
tags.PeerService.Set(span, "mysql")
span.SetTag("sql.query", "SELECT * FROM customer WHERE customer_id="+customerID)
defer span.Finish()
ctx = opentracing.ContextWithSpan(ctx, span)
}
// 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")
}