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census_tracing.go
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/
census_tracing.go
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package cmd
import (
"context"
"net/http"
"os"
"github.com/cpuguy83/strongerrors"
"github.com/pkg/errors"
"github.com/virtual-kubelet/virtual-kubelet/log"
"go.opencensus.io/trace"
"go.opencensus.io/zpages"
)
var (
tracingExporters = make(map[string]TracingExporterInitFunc)
reservedTagNames = map[string]bool{
"operatingSystem": true,
"provider": true,
"nodeName": true,
}
)
// TracingExporterOptions is used to pass options to the configured tracer
type TracingExporterOptions struct {
Tags map[string]string
ServiceName string
}
// TracingExporterInitFunc is the function that is called to initialize an exporter.
// This is used when registering an exporter and called when a user specifed they want to use the exporter.
type TracingExporterInitFunc func(TracingExporterOptions) (trace.Exporter, error)
// RegisterTracingExporter registers a tracing exporter.
// For a user to select an exporter, it must be registered here.
func RegisterTracingExporter(name string, f TracingExporterInitFunc) {
tracingExporters[name] = f
}
// GetTracingExporter gets the specified tracing exporter passing in the options to the exporter init function.
// For an exporter to be availbale here it must be registered with `RegisterTracingExporter`.
func GetTracingExporter(name string, opts TracingExporterOptions) (trace.Exporter, error) {
f, ok := tracingExporters[name]
if !ok {
return nil, strongerrors.NotFound(errors.Errorf("tracing exporter %q not found", name))
}
return f(opts)
}
// AvailableTraceExporters gets the list of registered exporters
func AvailableTraceExporters() []string {
out := make([]string, 0, len(tracingExporters))
for k := range tracingExporters {
out = append(out, k)
}
return out
}
func setupZpages() {
ctx := context.TODO()
p := os.Getenv("ZPAGES_PORT")
if p == "" {
log.G(ctx).Error("Missing ZPAGES_PORT env var, cannot setup zpages endpoint")
}
mux := http.NewServeMux()
zpages.Handle(mux, "/debug")
http.ListenAndServe(p, mux)
}