func()

in step1/src/client/main.go [57:95]

• 32 lines of code
• 5 McCabe index (conditional complexity)

func (cs *clientService) handler(w http.ResponseWriter, r *http.Request) {
	// NOTE: do not pass the raw query in production systems.
	rawQuery := r.URL.Query().Get("q")
	query, err := url.QueryUnescape(rawQuery)
	if err != nil {
		writeError(w, fmt.Sprintf("can't unescape the query: %s", rawQuery))
		return
	}

	ctx := r.Context()
	ctx, cancel := context.WithCancel(ctx)
	defer cancel()
	// step1. instrument trace
	span := trace.SpanFromContext(ctx)
	defer span.End()
	// step1. end instrument

	cli := shakesapp.NewShakespeareServiceClient(cs.serverSvcConn)
	resp, err := cli.GetMatchCount(ctx, &shakesapp.ShakespeareRequest{
		Query: query,
	})
	if err != nil {
		writeError(w, fmt.Sprintf("error calling GetMatchCount: %v", err))
		return
	}
	ret, err := json.Marshal(resp)
	if err != nil {
		writeError(w, fmt.Sprintf("error marshalling data: %v", err))
		return
	}
	// step1. add span specific attribute
	span.SetAttributes(attribute.Key("matched").Int64(resp.MatchCount))
	// step1. end adding attribute
	log.Println(string(ret))
	if _, err = w.Write(ret); err != nil {
		writeError(w, fmt.Sprintf("error on writing response: %v", err))
		return
	}
}