Instrument SSL sockets using MemoryDumpProvider

net/ssl/ssl_client_session_cache.cc

Index: net/ssl/ssl_client_session_cache.cc
diff --git a/net/ssl/ssl_client_session_cache.cc b/net/ssl/ssl_client_session_cache.cc
index fc817fdba0b410f37294f964c63be70d6e7753c4..4f40e23a7f1c6f5d163089c3623a4cd1384c4c6f 100644
--- a/net/ssl/ssl_client_session_cache.cc
+++ b/net/ssl/ssl_client_session_cache.cc
@@ -4,11 +4,16 @@
 
 #include "net/ssl/ssl_client_session_cache.h"
 
+#include <openssl/ssl.h>
+#include <openssl/x509.h>
 #include <utility>
 
 #include "base/memory/memory_coordinator_client_registry.h"
+#include "base/strings/stringprintf.h"
 #include "base/time/clock.h"
 #include "base/time/default_clock.h"
+#include "base/trace_event/process_memory_dump.h"
+#include "net/cert/x509_util_openssl.h"
 #include "third_party/boringssl/src/include/openssl/ssl.h"
 
 namespace net {
@@ -82,6 +87,45 @@ bool SSLClientSessionCache::IsExpired(SSL_SESSION* session, time_t now) {
              SSL_SESSION_get_time(session) + SSL_SESSION_get_timeout(session);
 }
 
+void SSLClientSessionCache::DumpMemoryStats(
+    base::trace_event::ProcessMemoryDump* pmd) {
+  base::AutoLock lock(lock_);

[eroman, 2016/12/02 00:27:24]

Can the lock acquisition be moved to after CreateAllocatorDump() ?

[xunjieli, 2016/12/02 15:31:34]

Done.

+
+  std::string absolute_name = "net/ssl_session_cache";
+  base::trace_event::MemoryAllocatorDump* cache_dump =
+      pmd->GetAllocatorDump(absolute_name);
+  // This method can be reached from different URLRequestContexts. Since this is
+  // a singleton, only log memory stats once.
+  if (cache_dump)
+    return;
+  cache_dump = pmd->CreateAllocatorDump(absolute_name);
+  auto iter = cache_.begin();
+  while (iter != cache_.end()) {
+    auto entry = iter->second.get();
+    auto cert_chain = entry->x509_chain;
+    size_t cert_count = sk_X509_num(cert_chain);
+    base::trace_event::MemoryAllocatorDump* entry_dump =
+        pmd->CreateAllocatorDump(
+            base::StringPrintf("%s/entry_%p", absolute_name.c_str(), entry));
+    int cert_size = 0;
+    for (size_t i = 0; i < cert_count; ++i) {
+      X509* cert = sk_X509_value(cert_chain, i);
+      cert_size += i2d_X509(cert, nullptr);
+    }
+    entry_dump->AddScalar("cert_size",
+                          base::trace_event::MemoryAllocatorDump::kUnitsBytes,
+                          cert_size);
+    entry_dump->AddScalar("cert_count",
+                          base::trace_event::MemoryAllocatorDump::kUnitsObjects,
+                          cert_count);
+    entry_dump->AddScalar(base::trace_event::MemoryAllocatorDump::kNameSize,
+                          base::trace_event::MemoryAllocatorDump::kUnitsBytes,
+                          cert_size);
+
+    ++iter;
+  }
+}
+
 void SSLClientSessionCache::FlushExpiredSessions() {
   time_t now = clock_->Now().ToTimeT();
   auto iter = cache_.begin();