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net/socket/ssl_session_cache_openssl.cc

 // Copyright 2013 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/socket/ssl_session_cache_openssl.h"
 
 #include <list>
 #include <map>
 
 #include <openssl/rand.h>
@@ skipping 218 matching lines @@
       return false;  // Session has not yet been marked good. Treat as a miss.
 
     // Move to front of MRU list.
     ordering_.push_front(session);
     ordering_.erase(it->second);
     it->second = ordering_.begin();
 
     return SSL_set_session(ssl, session) == 1;
   }
 
+  bool SSLSessionIsInCache(const std::string& cache_key) {
+    base::AutoLock locked(lock_);
+    KeyIndex::const_iterator it = key_index_.find(cache_key);
+    if (it == key_index_.end())
+      return false;
+    return true;
+  }
+
   void MarkSSLSessionAsGood(SSL* ssl) {
     SSL_SESSION* session = SSL_get_session(ssl);
     if (!session)
       return;
 
     // Mark the session as good, allowing it to be used for future connections.
     SSL_SESSION_set_ex_data(
         session, GetSSLSessionExIndex(), reinterpret_cast<void*>(1));
   }
 
@@ skipping 213 matching lines @@
     DLOG(ERROR) << "Couldn't generate unique session ID of " << id_len
                 << "bytes after " << kMaxTries << " tries.";
     return false;
   }
 
   SSL_CTX* ctx_;
   SSLSessionCacheOpenSSL::Config config_;
 
   // method to get the index which can later be used with SSL_CTX_get_ex_data()
   // or SSL_CTX_set_ex_data().
-  base::Lock lock_;  // Protects access to containers below.
+  mutable base::Lock lock_;  // Protects access to containers below.

[wtc, 2014/06/19 19:38:11]

In general we should avoid the 'mutable' keyword. It is commonly used on members
that are a lock or mutex, or a cached value that is computed lazily. So this is
fine.

But if I understand the code correctly, 'mutable' is necessary only if we also
declare the SSLSessionIsInCache method on line 239 as const, right? We should do
that.

[mshelley1, 2014/06/24 17:03:59]

Done.

 
   MRUSessionList ordering_;
   KeyIndex key_index_;
   SessionIdIndex id_index_;
 
   size_t expiration_check_;
 };
 
 SSLSessionCacheOpenSSL::~SSLSessionCacheOpenSSL() { delete impl_; }
 
 size_t SSLSessionCacheOpenSSL::size() const { return impl_->size(); }
 
 void SSLSessionCacheOpenSSL::Reset(SSL_CTX* ctx, const Config& config) {
   if (impl_)
     delete impl_;
 
   impl_ = new SSLSessionCacheOpenSSLImpl(ctx, config);
 }
 
 bool SSLSessionCacheOpenSSL::SetSSLSession(SSL* ssl) {
   return impl_->SetSSLSession(ssl);
 }
 
 bool SSLSessionCacheOpenSSL::SetSSLSessionWithKey(
     SSL* ssl,
     const std::string& cache_key) {
   return impl_->SetSSLSessionWithKey(ssl, cache_key);
 }
 
+bool SSLSessionCacheOpenSSL::SSLSessionIsInCache(
+    const std::string& cache_key) const {
+  return impl_->SSLSessionIsInCache(cache_key);
+}
+
 void SSLSessionCacheOpenSSL::MarkSSLSessionAsGood(SSL* ssl) {
   return impl_->MarkSSLSessionAsGood(ssl);
 }
 
 void SSLSessionCacheOpenSSL::Flush() { impl_->Flush(); }
 
 }  // namespace net