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collector_proxy.go
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collector_proxy.go
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// 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 httpserver
import (
"time"
"github.com/uber/jaeger-lib/metrics"
"github.com/uber/tchannel-go"
"github.com/uber/tchannel-go/thrift"
"github.com/jaegertracing/jaeger/thrift-gen/baggage"
"github.com/jaegertracing/jaeger/thrift-gen/sampling"
)
type collectorProxy struct {
samplingClient sampling.TChanSamplingManager
baggageClient baggage.TChanBaggageRestrictionManager
metrics struct {
// Number of successful sampling rate responses from collector
SamplingSuccess metrics.Counter `metric:"collector-proxy" tags:"result=ok,endpoint=sampling"`
// Number of failed sampling rate responses from collector
SamplingFailures metrics.Counter `metric:"collector-proxy" tags:"result=err,endpoint=sampling"`
// Number of successful baggage restriction responses from collector
BaggageSuccess metrics.Counter `metric:"collector-proxy" tags:"result=ok,endpoint=baggage"`
// Number of failed baggage restriction responses from collector
BaggageFailures metrics.Counter `metric:"collector-proxy" tags:"result=err,endpoint=baggage"`
}
}
// NewCollectorProxy implements Manager by proxying the requests to collector.
func NewCollectorProxy(svc string, channel *tchannel.Channel, mFactory metrics.Factory) ClientConfigManager {
thriftClient := thrift.NewClient(channel, svc, nil)
res := &collectorProxy{
samplingClient: sampling.NewTChanSamplingManagerClient(thriftClient),
baggageClient: baggage.NewTChanBaggageRestrictionManagerClient(thriftClient),
}
metrics.Init(&res.metrics, mFactory, nil)
return res
}
func (c *collectorProxy) GetSamplingStrategy(serviceName string) (*sampling.SamplingStrategyResponse, error) {
ctx, cancel := tchannel.NewContextBuilder(time.Second).DisableTracing().Build()
defer cancel()
// TODO: enable tracer on the tchannel and get metrics for free (sampler can be off)
resp, err := c.samplingClient.GetSamplingStrategy(ctx, serviceName)
if err != nil {
c.metrics.SamplingFailures.Inc(1)
return nil, err
}
c.metrics.SamplingSuccess.Inc(1)
return resp, nil
}
func (c *collectorProxy) GetBaggageRestrictions(serviceName string) ([]*baggage.BaggageRestriction, error) {
ctx, cancel := tchannel.NewContextBuilder(time.Second).DisableTracing().Build()
defer cancel()
resp, err := c.baggageClient.GetBaggageRestrictions(ctx, serviceName)
if err != nil {
c.metrics.BaggageFailures.Inc(1)
return nil, err
}
c.metrics.BaggageSuccess.Inc(1)
return resp, nil
}