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zipkin.go
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zipkin.go
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package handlers
import (
"net/http"
"github.com/urfave/negroni"
router_http "code.cloudfoundry.org/gorouter/common/http"
"code.cloudfoundry.org/lager"
)
type zipkin struct {
zipkinEnabled bool
logger lager.Logger
headersToLog *[]string // Shared state with proxy for access logs
}
func NewZipkin(enabled bool, headersToLog *[]string, logger lager.Logger) negroni.Handler {
return &zipkin{
zipkinEnabled: enabled,
headersToLog: headersToLog,
logger: logger,
}
}
func (z *zipkin) ServeHTTP(rw http.ResponseWriter, r *http.Request, next http.HandlerFunc) {
defer next(rw, r)
if !z.zipkinEnabled {
return
}
router_http.SetB3Headers(r, z.logger)
if !contains(*z.headersToLog, router_http.B3TraceIdHeader) {
*z.headersToLog = append(*z.headersToLog, router_http.B3TraceIdHeader)
}
if !contains(*z.headersToLog, router_http.B3SpanIdHeader) {
*z.headersToLog = append(*z.headersToLog, router_http.B3SpanIdHeader)
}
if !contains(*z.headersToLog, router_http.B3ParentSpanIdHeader) {
*z.headersToLog = append(*z.headersToLog, router_http.B3ParentSpanIdHeader)
}
}
func contains(s []string, e string) bool {
for _, a := range s {
if a == e {
return true
}
}
return false
}