2b76578994
* Move tracing exporter registration This doesn't belong in the library and should be configured by the consumer of the opencensus package. * Rename `vkublet` package to `node` `vkubelet` does not convey any information to the consumers of the package. Really it would be nice to move this package to the root of the repo, but then you wind up with... interesting... import semantics due to the repo name... and after thinking about it some, a subpackage is really not so bad as long as it has a name that convey's some information. `node` was chosen since this package deals with all the semantics of operating a node in Kubernetes.
115 lines
2.9 KiB
Go
115 lines
2.9 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/pkg/errors"
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"github.com/virtual-kubelet/virtual-kubelet/errdefs"
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"github.com/virtual-kubelet/virtual-kubelet/log"
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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 errdefs.InvalidInputf("invalid trace tag %q, must not use a reserved tag key", k)
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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 := 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 errdefs.AsInvalidInput(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 errdefs.AsInvalidInput(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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