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/*
*
* Copyright 2018 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#ifndef GRPC_CORE_TSI_SSL_SESSION_CACHE_SSL_SESSION_CACHE_H
#define GRPC_CORE_TSI_SSL_SESSION_CACHE_SSL_SESSION_CACHE_H
#include <grpc/support/port_platform.h>
#include "src/core/tsi/grpc_shadow_boringssl.h"
#include <grpc/slice.h>
#include <grpc/support/sync.h>
extern "C" {
#include <openssl/ssl.h>
}
#include "src/core/lib/avl/avl.h"
#include "src/core/lib/gprpp/memory.h"
#include "src/core/lib/gprpp/ref_counted.h"
#include "src/core/tsi/ssl/session_cache/ssl_session.h"
/// Cache for SSL sessions for sessions resumption.
///
/// Older sessions may be evicted from the cache using LRU policy if capacity
/// limit is hit. All sessions are associated with some key, usually server
/// name. Note that servers are required to share session ticket encryption keys
/// in order for cache to be effective.
///
/// This class is thread safe.
namespace tsi {
class SslSessionLRUCache : public grpc_core::RefCounted<SslSessionLRUCache> {
public:
/// Create new LRU cache with the given capacity.
static grpc_core::RefCountedPtr<SslSessionLRUCache> Create(size_t capacity) {
return grpc_core::MakeRefCounted<SslSessionLRUCache>(capacity);
}
// Not copyable nor movable.
SslSessionLRUCache(const SslSessionLRUCache&) = delete;
SslSessionLRUCache& operator=(const SslSessionLRUCache&) = delete;
/// Returns current number of sessions in the cache.
size_t Size();
/// Add \a session in the cache using \a key. This operation may discard older
/// sessions.
void Put(const char* key, SslSessionPtr session);
/// Returns the session from the cache associated with \a key or null if not
/// found.
SslSessionPtr Get(const char* key);
private:
// So New() can call our private ctor.
template <typename T, typename... Args>
friend T* grpc_core::New(Args&&... args);
// So Delete() can call our private dtor.
template <typename T>
friend void grpc_core::Delete(T*);
class Node;
explicit SslSessionLRUCache(size_t capacity);
~SslSessionLRUCache();
Node* FindLocked(const grpc_slice& key);
void Remove(Node* node);
void PushFront(Node* node);
void AssertInvariants();
gpr_mu lock_;
size_t capacity_;
Node* use_order_list_head_ = nullptr;
Node* use_order_list_tail_ = nullptr;
size_t use_order_list_size_ = 0;
grpc_avl entry_by_key_;
};
} // namespace tsi
#endif /* GRPC_CORE_TSI_SSL_SESSION_CACHE_SSL_SESSION_CACHE_H */
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