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122 lines
3.6 KiB
C++
122 lines
3.6 KiB
C++
// Copyright 2015 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef NET_SSL_SSL_CLIENT_SESSION_CACHE_H_
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#define NET_SSL_SSL_CLIENT_SESSION_CACHE_H_
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#include <stddef.h>
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#include <time.h>
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#include <memory>
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#include <string>
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#include "base/bind.h"
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#include "base/containers/mru_cache.h"
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#include "base/macros.h"
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#include "base/memory/memory_coordinator_client.h"
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#include "base/memory/memory_pressure_monitor.h"
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#include "base/synchronization/lock.h"
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#include "base/threading/thread_checker.h"
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#include "base/time/time.h"
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#include "net/base/net_export.h"
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#include "third_party/boringssl/src/include/openssl/base.h"
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namespace base {
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class Clock;
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namespace trace_event {
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class ProcessMemoryDump;
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}
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}
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namespace net {
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class NET_EXPORT SSLClientSessionCache : public base::MemoryCoordinatorClient {
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public:
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struct Config {
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// The maximum number of entries in the cache.
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size_t max_entries = 1024;
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// The number of calls to Lookup before a new check for expired sessions.
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size_t expiration_check_count = 256;
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};
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explicit SSLClientSessionCache(const Config& config);
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~SSLClientSessionCache() override;
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// Returns true if |entry| is expired as of |now|.
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static bool IsExpired(SSL_SESSION* session, time_t now);
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size_t size() const;
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// Returns the session associated with |cache_key| and moves it to the front
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// of the MRU list. Returns nullptr if there is none.
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bssl::UniquePtr<SSL_SESSION> Lookup(const std::string& cache_key);
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// Resets the count returned by Lookup to 0 for the session associated with
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// |cache_key|.
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void ResetLookupCount(const std::string& cache_key);
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// Inserts |session| into the cache at |cache_key|. If there is an existing
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// one, it is released. Every |expiration_check_count| calls, the cache is
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// checked for stale entries.
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void Insert(const std::string& cache_key, SSL_SESSION* session);
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// Removes all entries from the cache.
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void Flush();
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void SetClockForTesting(std::unique_ptr<base::Clock> clock);
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// Dumps memory allocation stats. |pmd| is the ProcessMemoryDump of the
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// browser process.
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void DumpMemoryStats(base::trace_event::ProcessMemoryDump* pmd);
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private:
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struct Entry {
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Entry();
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Entry(Entry&&);
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~Entry();
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// Adds a new session onto this entry, dropping the oldest one if two are
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// already stored.
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void Push(bssl::UniquePtr<SSL_SESSION> session);
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// Retrieves the latest session from the entry, removing it if its
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// single-use.
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bssl::UniquePtr<SSL_SESSION> Pop();
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// Removes any expired sessions, returning true if this entry can be
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// deleted.
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bool ExpireSessions(time_t now);
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bssl::UniquePtr<SSL_SESSION> sessions[2] = {nullptr};
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};
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// base::MemoryCoordinatorClient implementation:
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void OnPurgeMemory() override;
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// Removes all expired sessions from the cache.
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void FlushExpiredSessions();
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// Clear cache on low memory notifications callback.
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void OnMemoryPressure(
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base::MemoryPressureListener::MemoryPressureLevel memory_pressure_level);
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std::unique_ptr<base::Clock> clock_;
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Config config_;
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base::HashingMRUCache<std::string, Entry> cache_;
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size_t lookups_since_flush_;
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// TODO(davidben): After https://crbug.com/458365 is fixed, replace this with
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// a ThreadChecker. The session cache should be single-threaded like other
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// classes in net.
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base::Lock lock_;
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std::unique_ptr<base::MemoryPressureListener> memory_pressure_listener_;
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DISALLOW_COPY_AND_ASSIGN(SSLClientSessionCache);
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};
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} // namespace net
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#endif // NET_SSL_SSL_CLIENT_SESSION_CACHE_H_
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