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113 lines
3.3 KiB
113 lines
3.3 KiB
// Copyright (c) 2019 The Jaeger Authors.
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// Copyright (c) 2017 Uber Technologies, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package driver
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import (
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"context"
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"errors"
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"fmt"
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"math/rand"
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"sync"
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"go.opentelemetry.io/otel/attribute"
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"go.opentelemetry.io/otel/codes"
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"go.opentelemetry.io/otel/trace"
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"go.uber.org/zap"
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"github.com/jaegertracing/jaeger/examples/hotrod/pkg/delay"
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"github.com/jaegertracing/jaeger/examples/hotrod/pkg/log"
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"github.com/jaegertracing/jaeger/examples/hotrod/pkg/tracing"
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"github.com/jaegertracing/jaeger/examples/hotrod/services/config"
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"github.com/jaegertracing/jaeger/pkg/metrics"
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)
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// Redis is a simulator of remote Redis cache
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type Redis struct {
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tracer trace.Tracer // simulate redis as a separate process
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logger log.Factory
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errorSimulator
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}
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func newRedis(otelExporter string, metricsFactory metrics.Factory, logger log.Factory) *Redis {
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tp := tracing.InitOTEL("redis-manual", otelExporter, metricsFactory, logger)
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return &Redis{
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tracer: tp.Tracer("redis-manual"),
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logger: logger,
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}
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}
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// FindDriverIDs finds IDs of drivers who are near the location.
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func (r *Redis) FindDriverIDs(ctx context.Context, location string) []string {
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ctx, span := r.tracer.Start(ctx, "FindDriverIDs", trace.WithSpanKind(trace.SpanKindClient))
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span.SetAttributes(attribute.Key("param.driver.location").String(location))
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defer span.End()
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// simulate RPC delay
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delay.Sleep(config.RedisFindDelay, config.RedisFindDelayStdDev)
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drivers := make([]string, 10)
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for i := range drivers {
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// #nosec
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drivers[i] = fmt.Sprintf("T7%05dC", rand.Int()%100000)
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}
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r.logger.For(ctx).Info("Found drivers", zap.Strings("drivers", drivers))
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return drivers
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}
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// GetDriver returns driver and the current car location
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func (r *Redis) GetDriver(ctx context.Context, driverID string) (Driver, error) {
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ctx, span := r.tracer.Start(ctx, "GetDriver", trace.WithSpanKind(trace.SpanKindClient))
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span.SetAttributes(attribute.Key("param.driverID").String(driverID))
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defer span.End()
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// simulate RPC delay
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delay.Sleep(config.RedisGetDelay, config.RedisGetDelayStdDev)
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if err := r.checkError(); err != nil {
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span.RecordError(err)
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span.SetStatus(codes.Error, "An error occurred")
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r.logger.For(ctx).Error("redis timeout", zap.String("driver_id", driverID), zap.Error(err))
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return Driver{}, err
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}
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r.logger.For(ctx).Info("Got driver's ID", zap.String("driverID", driverID))
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// #nosec
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return Driver{
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DriverID: driverID,
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Location: fmt.Sprintf("%d,%d", rand.Int()%1000, rand.Int()%1000),
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}, nil
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}
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var errTimeout = errors.New("redis timeout")
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type errorSimulator struct {
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sync.Mutex
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countTillError int
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}
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func (es *errorSimulator) checkError() error {
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es.Lock()
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es.countTillError--
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if es.countTillError > 0 {
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es.Unlock()
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return nil
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}
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es.countTillError = 5
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es.Unlock()
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delay.Sleep(2*config.RedisGetDelay, 0) // add more delay for "timeout"
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return errTimeout
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}
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