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debug.go
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debug.go
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package metrics
import (
"expvar"
"net/http"
"strings"
"code.cloudfoundry.org/debugserver"
"code.cloudfoundry.org/lager/v3"
"github.com/tedsuo/ifrit"
"github.com/tedsuo/ifrit/http_server"
)
func StartDebugServer(address string, sink *lager.ReconfigurableSink, metrics Metrics) (ifrit.Process, error) {
for key, metric := range metrics {
// https://github.com/golang/go/wiki/CommonMistakes
captureKey := key
captureMetric := metric
expvar.Publish(captureKey, expvar.Func(func() interface{} {
return captureMetric()
}))
}
server := http_server.New(address, handler(sink))
p := ifrit.Invoke(server)
select {
case <-p.Ready():
case err := <-p.Wait():
return nil, err
}
return p, nil
}
func handler(sink *lager.ReconfigurableSink) http.Handler {
pprofHandler := debugserver.Handler(sink)
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if strings.HasPrefix(r.URL.Path, "/debug/vars") {
http.DefaultServeMux.ServeHTTP(w, r)
return
}
pprofHandler.ServeHTTP(w, r)
})
}