Add QuicStrCat.

net/quic/core/quic_connection.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/quic/core/quic_connection.h"
 
 #include <string.h>
 #include <sys/types.h>
 
 #include <algorithm>
@@ skipping 518 matching lines @@
     DLOG(WARNING) << error_details;
     TearDownLocalConnectionState(QUIC_INVALID_VERSION_NEGOTIATION_PACKET,
                                  error_details,
                                  ConnectionCloseSource::FROM_SELF);
     return;
   }
 
   if (!SelectMutualVersion(packet.versions)) {
     CloseConnection(
         QUIC_INVALID_VERSION,
-        "No common version found. Supported versions: {" +
-            QuicVersionVectorToString(framer_.supported_versions()) +
-            "}, peer supported versions: {" +
-            QuicVersionVectorToString(packet.versions) + "}",
+        QuicStrCat("No common version found. Supported versions: {",
+                   QuicVersionVectorToString(framer_.supported_versions()),
+                   "}, peer supported versions: {",
+                   QuicVersionVectorToString(packet.versions), "}"),
         ConnectionCloseBehavior::SEND_CONNECTION_CLOSE_PACKET);
     return;
   }
 
   DVLOG(1) << ENDPOINT
            << "Negotiated version: " << QuicVersionToString(version());
   server_supported_versions_ = packet.versions;
   version_negotiation_state_ = NEGOTIATION_IN_PROGRESS;
   RetransmitUnackedPackets(ALL_UNACKED_RETRANSMISSION);
 }
@@ skipping 813 matching lines @@
                     ConnectionCloseBehavior::SEND_CONNECTION_CLOSE_PACKET);
     return false;
   }
 
   if (version_negotiation_state_ != NEGOTIATED_VERSION) {
     if (perspective_ == Perspective::IS_SERVER) {
       if (!header.public_header.version_flag) {
         // Packets should have the version flag till version negotiation is
         // done.
         string error_details =
-            StringPrintf("%s Packet %" PRIu64
-                         " without version flag before version negotiated.",
-                         ENDPOINT, header.packet_number);
+            QuicStrCat(ENDPOINT, "Packet ", header.packet_number,
+                       " without version flag before version negotiated.");
         DLOG(WARNING) << error_details;
         CloseConnection(QUIC_INVALID_VERSION, error_details,
                         ConnectionCloseBehavior::SEND_CONNECTION_CLOSE_PACKET);
         return false;
       } else {
         DCHECK_EQ(1u, header.public_header.versions.size());
         DCHECK_EQ(header.public_header.versions[0], version());
         version_negotiation_state_ = NEGOTIATED_VERSION;
         visitor_->OnSuccessfulVersionNegotiation(version());
         if (debug_visitor_ != nullptr) {
@@ skipping 298 matching lines @@
   return false;
 }
 
 void QuicConnection::OnWriteError(int error_code) {
   if (write_error_occured_) {
     // A write error already occurred. The connection is being closed.
     return;
   }
   write_error_occured_ = true;
 
-  const string error_details = "Write failed with error: " +
-                               base::IntToString(error_code) + " (" +
-                               ErrorToString(error_code) + ")";
+  const string error_details = QuicStrCat(
+      "Write failed with error: ", error_code, " (", strerror(error_code), ")");
   DVLOG(1) << ENDPOINT << error_details;
   // We can't send an error as the socket is presumably borked.
   switch (error_code) {
     case kMessageTooBigErrorCode:
       CloseConnection(
           QUIC_PACKET_WRITE_ERROR, error_details,
           ConnectionCloseBehavior::SEND_CONNECTION_CLOSE_PACKET_WITH_NO_ACK);
       break;
     default:
       // We can't send an error as the socket is presumably borked.
@@ skipping 748 matching lines @@
 
 void QuicConnection::CheckIfApplicationLimited() {
   if (queued_packets_.empty() &&
       !sent_packet_manager_->HasPendingRetransmissions() &&
       !visitor_->WillingAndAbleToWrite()) {
     sent_packet_manager_->OnApplicationLimited();
   }
 }
 
 }  // namespace net