6d49bb981c
If the zpages server exits for any reason, or is unable to bind, rather than exiting silently, throw an error.
116 lines
3.0 KiB
Go
116 lines
3.0 KiB
Go
// Copyright © 2017 The virtual-kubelet authors
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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 root
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import (
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"context"
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"net"
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"net/http"
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"os"
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"strconv"
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"strings"
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"github.com/cpuguy83/strongerrors"
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"github.com/pkg/errors"
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"github.com/virtual-kubelet/virtual-kubelet/log"
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"github.com/virtual-kubelet/virtual-kubelet/trace/opencensus"
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octrace "go.opencensus.io/trace"
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"go.opencensus.io/zpages"
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)
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var (
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reservedTagNames = map[string]bool{
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"operatingSystem": true,
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"provider": true,
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"nodeName": true,
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}
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)
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func setupTracing(ctx context.Context, c Opts) error {
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for k := range c.TraceConfig.Tags {
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if reservedTagNames[k] {
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return strongerrors.InvalidArgument(errors.Errorf("invalid trace tag %q, must not use a reserved tag key"))
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}
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}
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if c.TraceConfig.Tags == nil {
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c.TraceConfig.Tags = make(map[string]string, 3)
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}
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c.TraceConfig.Tags["operatingSystem"] = c.OperatingSystem
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c.TraceConfig.Tags["provider"] = c.Provider
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c.TraceConfig.Tags["nodeName"] = c.NodeName
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for _, e := range c.TraceExporters {
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if e == "zpages" {
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setupZpages(ctx)
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continue
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}
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exporter, err := opencensus.GetTracingExporter(e, c.TraceConfig)
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if err != nil {
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return err
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}
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octrace.RegisterExporter(exporter)
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}
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if len(c.TraceExporters) > 0 {
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var s octrace.Sampler
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switch strings.ToLower(c.TraceSampleRate) {
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case "":
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case "always":
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s = octrace.AlwaysSample()
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case "never":
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s = octrace.NeverSample()
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default:
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rate, err := strconv.Atoi(c.TraceSampleRate)
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if err != nil {
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return strongerrors.InvalidArgument(errors.Wrap(err, "unsupported trace sample rate"))
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}
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if rate < 0 || rate > 100 {
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return strongerrors.InvalidArgument(errors.Wrap(err, "trace sample rate must be between 0 and 100"))
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}
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s = octrace.ProbabilitySampler(float64(rate) / 100)
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}
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if s != nil {
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octrace.ApplyConfig(
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octrace.Config{
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DefaultSampler: s,
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},
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)
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}
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}
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return nil
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}
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func setupZpages(ctx context.Context) {
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p := os.Getenv("ZPAGES_PORT")
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if p == "" {
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log.G(ctx).Error("Missing ZPAGES_PORT env var, cannot setup zpages endpoint")
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}
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listener, err := net.Listen("tcp", p)
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if err != nil {
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log.G(ctx).WithError(err).Error("Cannot bind to ZPAGES PORT, cannot setup listener")
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return
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}
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mux := http.NewServeMux()
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zpages.Handle(mux, "/debug")
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go func() {
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// This should never terminate, if it does, it will always terminate with an error
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e := http.Serve(listener, mux)
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if e == http.ErrServerClosed {
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return
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}
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log.G(ctx).WithError(e).Error("Zpages server exited")
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}()
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}
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