signature_cache_interface.h

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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the Apache 2.0 License.
#pragma once
 
#include "ccf/node_subsystem_interface.h"
#include "ccf/tx_id.h"
#include "service/tables/signatures.h"
 
#include <optional>
#include <vector>
 
namespace ccf
{
  struct CachedSignature
  {
    std::optional<PrimarySignature> sig;
    std::optional<std::vector<uint8_t>> cose_signature;
    std::vector<uint8_t> serialised_tree;
    ccf::SeqNo sig_seqno;
  };
 
  class SignatureCacheInterface : public AbstractNodeSubSystem
  {
  public:
    ~SignatureCacheInterface() override = default;
 
    static char const* get_subsystem_name()
    {
      return "SignatureCache";
    }
 
    // Returns the covering signature for a given seqno, or nullopt if
    // unavailable. When a value is returned, Merkle tree and at least one of
    // the signatures is populated, or both if present.
    [[nodiscard]] virtual std::optional<CachedSignature> get_signature_for(
      ccf::SeqNo seqno) const = 0;
 
    virtual void set_max_cache_size(size_t n) = 0;
  };
}