Add histograms to collect handshake status when connection migration is...

Add histograms to collect handshake status when connection migration is triggered based on migration cause.

Bug: 790547
Change-Id: I08efdc45b558d711b310aac55f412381efc3eaa6
Reviewed-on: https://chromium-review.googlesource.com/1140532Reviewed-by: Ryan Hamilton <rch@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Zhongyi Shi <zhongyi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#576205}

net/quic/chromium/quic_chromium_client_session.cc

@@ -1661,12 +1661,6 @@ void QuicChromiumClientSession::MigrateSessionOnWriteError(
   }
 
   current_connection_migration_cause_ = ON_WRITE_ERROR;
-  LogHandshakeStatusOnConnectionMigrationSignal();
-  const NetLogWithSource migration_net_log = NetLogWithSource::Make(
-      net_log_.net_log(), NetLogSourceType::QUIC_CONNECTION_MIGRATION);
-  migration_net_log.BeginEvent(
-      NetLogEventType::QUIC_CONNECTION_MIGRATION_TRIGGERED,
-      base::Bind(&NetLogQuicConnectionMigrationTriggerCallback, "WriteError"));
 
   if (!IsSessionMigratable(/*close_session_if_not_migratable*/ false)) {
     // Close the connection if migration failed. Do not cause a
@@ -1677,6 +1671,14 @@ void QuicChromiumClientSession::MigrateSessionOnWriteError(
     return;
   }
 
+  LogHandshakeStatusOnConnectionMigrationSignal();
+
+  const NetLogWithSource migration_net_log = NetLogWithSource::Make(
+      net_log_.net_log(), NetLogSourceType::QUIC_CONNECTION_MIGRATION);
+  migration_net_log.BeginEvent(
+      NetLogEventType::QUIC_CONNECTION_MIGRATION_TRIGGERED,
+      base::Bind(&NetLogQuicConnectionMigrationTriggerCallback, "WriteError"));
+
   NetworkChangeNotifier::NetworkHandle new_network =
       stream_factory_->FindAlternateNetwork(
           GetDefaultSocket()->GetBoundNetwork());
@@ -1853,8 +1855,6 @@ void QuicChromiumClientSession::OnNetworkConnected(
     current_connection_migration_cause_ = ON_NETWORK_CONNECTED;
   }
 
-  LogHandshakeStatusOnConnectionMigrationSignal();
-
   if (wait_for_new_network_) {
     wait_for_new_network_ = false;
     // |wait_for_new_network_| is true, there was no working network previously.
@@ -1891,6 +1891,8 @@ void QuicChromiumClientSession::OnNetworkDisconnectedV2(
   }
 
   current_connection_migration_cause_ = ON_NETWORK_DISCONNECTED;
+  LogHandshakeStatusOnConnectionMigrationSignal();
+
   // Attempt to find alternative network.
   NetworkChangeNotifier::NetworkHandle new_network =
       stream_factory_->FindAlternateNetwork(disconnected_network);
@@ -1900,8 +1902,6 @@ void QuicChromiumClientSession::OnNetworkDisconnectedV2(
     return;
   }
 
-  LogHandshakeStatusOnConnectionMigrationSignal();
-
   // Current network is being disconnected, migrate immediately to the
   // alternative network.
   MigrateImmediately(new_network);
@@ -1923,9 +1923,8 @@ void QuicChromiumClientSession::OnNetworkMadeDefault(
   current_connection_migration_cause_ = ON_NETWORK_MADE_DEFAULT;
   current_migrations_to_non_default_network_on_path_degrading_ = 0;
 
-  // Connection migration v2.
-  // If we are already on the new network, simply cancel the timer to migrate
-  // back to the default network.
+  // Simply cancel the timer to migrate back to the default network if session
+  // is already on the default network.
   if (GetDefaultSocket()->GetBoundNetwork() == new_network) {
     CancelMigrateBackToDefaultNetworkTimer();
     HistogramAndLogMigrationFailure(
@@ -2019,13 +2018,16 @@ void QuicChromiumClientSession::OnPathDegrading() {
   if (most_recent_path_degrading_timestamp_ == base::TimeTicks())
     most_recent_path_degrading_timestamp_ = base::TimeTicks::Now();
 
-  if (stream_factory_) {
+  if (!stream_factory_)
+    return;
+
   const NetLogWithSource migration_net_log = NetLogWithSource::Make(
       net_log_.net_log(), NetLogSourceType::QUIC_CONNECTION_MIGRATION);
   migration_net_log.BeginEvent(
       NetLogEventType::QUIC_CONNECTION_MIGRATION_TRIGGERED,
       base::Bind(&NetLogQuicConnectionMigrationTriggerCallback,
                  "PathDegrading"));
+
   if (migrate_session_early_v2_) {
     NetworkChangeNotifier::NetworkHandle alternate_network =
         stream_factory_->FindAlternateNetwork(
@@ -2062,7 +2064,6 @@ void QuicChromiumClientSession::OnPathDegrading() {
   }
   migration_net_log.EndEvent(
       NetLogEventType::QUIC_CONNECTION_MIGRATION_TRIGGERED);
-  }
 }
 
 bool QuicChromiumClientSession::HasOpenDynamicStreams() const {
@@ -2463,6 +2464,15 @@ void QuicChromiumClientSession::LogHandshakeStatusOnConnectionMigrationSignal()
     const {
   UMA_HISTOGRAM_BOOLEAN("Net.QuicSession.HandshakeStatusOnConnectionMigration",
                         IsCryptoHandshakeConfirmed());
+
+  const std::string histogram_name =
+      "Net.QuicSession.HandshakeStatusOnConnectionMigration." +
+      ConnectionMigrationCauseToString(current_connection_migration_cause_);
+  STATIC_HISTOGRAM_POINTER_GROUP(
+      histogram_name, current_connection_migration_cause_,
+      MIGRATION_CAUSE_MAX, AddBoolean(IsCryptoHandshakeConfirmed()),
+      base::BooleanHistogram::FactoryGet(
+          histogram_name, base::HistogramBase::kUmaTargetedHistogramFlag));
 }
 
 void QuicChromiumClientSession::HistogramAndLogMigrationFailure(

tools/metrics/histograms/histograms.xml

@@ -53515,8 +53515,8 @@ uploading your change for review.
     enum="BooleanConfirmed">
   <owner>zhongyi@chromium.org</owner>
   <summary>
-    Whether hanshake has been confirmed when the session attempts to migrate the
-    connection.
+    The handshake status when when the session attempts to migrate the
+    connection according to different migration causes.
   </summary>
 </histogram>
 
@@ -116300,6 +116300,8 @@ uploading your change for review.
   <suffix name="Unknown"/>
   <affected-histogram name="Net.QuicSession.ConnectionMigration"/>
   <affected-histogram name="Net.QuicSession.ConnectionMigrationProbeSuccess"/>
+  <affected-histogram
+      name="Net.QuicSession.HandshakeStatusOnConnectionMigration"/>
 </histogram_suffixes>
 
 <histogram_suffixes name="ConnectivityDiagnostics" separator=".">