nghttp: Rewrite statistics output with -s option

Now timing information (completion, request, processing), status code
and request path are listed in the order by completion time.  This
ordering is very convenient to check resource prioritization
validation.

src/nghttp.cc

@@ -37,6 +37,7 @@
 #include <cstdlib>
 #include <cstring>
 #include <iostream>
+#include <iomanip>
 #include <sstream>
 #include <tuple>
 
@@ -1857,31 +1858,60 @@ int on_stream_close_callback(nghttp2_session *session, int32_t stream_id,
 }
 } // namespace
 
+struct RequestResult {
+  std::chrono::microseconds time;
+};
+
 namespace {
 void print_stats(const HttpClient &client) {
   std::cout << "***** Statistics *****" << std::endl;
-  int i = 0;
-  for (auto &req : client.reqvec) {
-    std::cout << "#" << ++i << ": " << req->uri << std::endl;
-    std::cout << "    Status: " << req->status << std::endl;
-    std::cout << "    Delta (ms) from handshake(HEADERS):" << std::endl;
-    if (req->timing.state >= RequestState::ON_RESPONSE) {
-      std::cout << "        response HEADERS: "
-                << time_delta(req->timing.on_response_time,
-                              client.timing.on_handshake_time).count() << "("
-                << time_delta(req->timing.on_response_time,
-                              req->timing.on_request_time).count() << ")"
-                << std::endl;
+
+  std::vector<Request *> reqs;
+  reqs.reserve(client.reqvec.size());
+  for (const auto &req : client.reqvec) {
+    if (req->timing.state == RequestState::ON_COMPLETE) {
+      reqs.push_back(req.get());
     }
-    if (req->timing.state >= RequestState::ON_COMPLETE) {
-      std::cout << "        Completed: "
-                << time_delta(req->timing.on_complete_time,
-                              client.timing.on_handshake_time).count() << "("
-                << time_delta(req->timing.on_complete_time,
-                              req->timing.on_request_time).count() << ")"
-                << std::endl;
   }
-    std::cout << std::endl;
+
+  std::sort(std::begin(reqs), std::end(reqs),
+            [](const Request *lhs, const Request *rhs) {
+    const auto &ltiming = lhs->timing;
+    const auto &rtiming = rhs->timing;
+    return ltiming.on_complete_time < rtiming.on_complete_time ||
+           (ltiming.on_complete_time == rtiming.on_complete_time &&
+            ltiming.on_request_time < rtiming.on_request_time);
+  });
+
+  std::cout << R"(
+Request timing:
+  complete: relative time from protocol handshake to stream close
+   request: relative   time  from   protocol   handshake  to   request
+            transmission
+   process: time for request and response
+      code: HTTP status code
+       URI: request URI
+
+sorted by 'complete'
+
+complete request  process  code request path)" << std::endl;
+
+  const auto &base = client.timing.on_handshake_time;
+  for (const auto &req : reqs) {
+    auto completed_delta =
+        std::chrono::duration_cast<std::chrono::microseconds>(
+            req->timing.on_complete_time - base);
+    auto request_delta = std::chrono::duration_cast<std::chrono::microseconds>(
+        req->timing.on_request_time - base);
+    auto total = std::chrono::duration_cast<std::chrono::microseconds>(
+        req->timing.on_complete_time - req->timing.on_request_time);
+
+    std::cout << std::setw(8) << ("+" + util::format_duration(completed_delta))
+              << " " << std::setw(8)
+              << ("+" + util::format_duration(request_delta)) << " "
+              << std::setw(8) << util::format_duration(total) << " "
+              << std::setw(4) << req->status << " " << req->make_reqpath()
+              << std::endl;
   }
 }
 } // namespace