mirror of https://github.com/status-im/evmc.git
examples: Rewrite Host example to use Host abstract class
This commit is contained in:
Paweł Bylica
parent
9eb9608b4a
commit
0c1e13b485
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@ -8,7 +8,7 @@
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#include "example_host.h"
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#include <evmc/helpers.h>
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#include <evmc/evmc.hpp>
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#include <evmc/helpers.hpp>
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#include <map>
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@ -21,153 +21,122 @@ struct account
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std::map<evmc_bytes32, evmc_bytes32> storage;
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};
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struct example_host_context : evmc_context
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class ExampleHost : public evmc::Host
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{
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example_host_context();
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evmc_tx_context tx_context = {};
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std::map<evmc_address, account> accounts;
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public:
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bool account_exists(const evmc_address& addr) noexcept final
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{
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return accounts.find(addr) != accounts.end();
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}
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evmc_bytes32 get_storage(const evmc_address& addr, const evmc_bytes32& key) noexcept final
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{
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auto it = accounts.find(addr);
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if (it != accounts.end())
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return it->second.storage[key];
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return {};
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}
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evmc_storage_status set_storage(const evmc_address& addr,
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const evmc_bytes32& key,
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const evmc_bytes32& value) noexcept final
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{
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auto& account = accounts[addr];
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auto prev_value = account.storage[key];
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account.storage[key] = value;
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return (prev_value == value) ? EVMC_STORAGE_UNCHANGED : EVMC_STORAGE_MODIFIED;
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}
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evmc_uint256be get_balance(const evmc_address& addr) noexcept final
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{
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auto it = accounts.find(addr);
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if (it != accounts.end())
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return it->second.balance;
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return {};
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}
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size_t get_code_size(const evmc_address& addr) noexcept final
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{
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auto it = accounts.find(addr);
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if (it != accounts.end())
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return it->second.code_size;
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return 0;
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}
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evmc_bytes32 get_code_hash(const evmc_address& addr) noexcept final
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{
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auto it = accounts.find(addr);
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if (it != accounts.end())
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return it->second.code_hash;
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return {};
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}
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size_t copy_code(const evmc_address& addr,
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size_t code_offset,
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uint8_t* buffer_data,
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size_t buffer_size) noexcept final
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{
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(void)addr;
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(void)code_offset;
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(void)buffer_data;
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(void)buffer_size;
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return 0;
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}
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void selfdestruct(const evmc_address& addr, const evmc_address& beneficiary) noexcept final
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{
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(void)addr;
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(void)beneficiary;
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}
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evmc::result call(const evmc_message& msg) noexcept final
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{
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(void)msg;
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// TODO: Improve C++ API for result creation.
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evmc_result res{};
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res.status_code = EVMC_FAILURE;
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return evmc::result{res};
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}
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evmc_tx_context get_tx_context() noexcept final { return {}; }
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evmc_bytes32 get_block_hash(int64_t number) noexcept final
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{
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int64_t current_block_number = get_tx_context().block_number;
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auto example_block_hash = evmc_bytes32{};
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if (number < current_block_number && number >= current_block_number - 256)
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example_block_hash = {{1, 1, 1, 1}};
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return example_block_hash;
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}
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void emit_log(const evmc_address& addr,
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const uint8_t* data,
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size_t data_size,
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const evmc_bytes32 topics[],
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size_t topics_count) noexcept final
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{
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(void)addr;
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(void)data;
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(void)data_size;
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(void)topics;
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(void)topics_count;
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}
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};
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static bool account_exists(evmc_context* context, const evmc_address* address)
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{
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auto* host = static_cast<example_host_context*>(context);
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return host->accounts.find(*address) != host->accounts.end();
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}
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static evmc_bytes32 get_storage(evmc_context* context,
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const evmc_address* address,
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const evmc_bytes32* key)
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{
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auto* host = static_cast<example_host_context*>(context);
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auto it = host->accounts.find(*address);
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if (it != host->accounts.end())
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return it->second.storage[*key];
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return {};
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}
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static evmc_storage_status set_storage(evmc_context* context,
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const evmc_address* address,
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const evmc_bytes32* key,
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const evmc_bytes32* value)
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{
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auto* host = static_cast<example_host_context*>(context);
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auto& account = host->accounts[*address];
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auto prev_value = account.storage[*key];
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account.storage[*key] = *value;
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return (prev_value == *value) ? EVMC_STORAGE_UNCHANGED : EVMC_STORAGE_MODIFIED;
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}
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static evmc_uint256be get_balance(evmc_context* context, const evmc_address* address)
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{
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auto* host = static_cast<example_host_context*>(context);
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auto it = host->accounts.find(*address);
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if (it != host->accounts.end())
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return it->second.balance;
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return {};
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}
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static size_t get_code_size(evmc_context* context, const evmc_address* address)
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{
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auto* host = static_cast<example_host_context*>(context);
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auto it = host->accounts.find(*address);
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if (it != host->accounts.end())
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return it->second.code_size;
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return 0;
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}
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static evmc_bytes32 get_code_hash(evmc_context* context, const evmc_address* address)
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{
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auto* host = static_cast<example_host_context*>(context);
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auto it = host->accounts.find(*address);
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if (it != host->accounts.end())
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return it->second.code_hash;
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return {};
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}
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static size_t copy_code(evmc_context* context,
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const evmc_address* address,
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size_t code_offset,
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uint8_t* buffer_data,
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size_t buffer_size)
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{
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(void)context;
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(void)address;
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(void)code_offset;
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(void)buffer_data;
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(void)buffer_size;
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return 0;
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}
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static void selfdestruct(evmc_context* context,
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const evmc_address* address,
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const evmc_address* beneficiary)
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{
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(void)context;
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(void)address;
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(void)beneficiary;
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}
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static evmc_result call(evmc_context* context, const evmc_message* msg)
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{
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(void)context;
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(void)msg;
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evmc_result result{};
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result.status_code = EVMC_FAILURE;
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return result;
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}
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static evmc_tx_context get_tx_context(evmc_context* context)
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{
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(void)context;
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evmc_tx_context result{};
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return result;
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}
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static evmc_bytes32 get_block_hash(evmc_context* context, int64_t number)
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{
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auto* host = static_cast<example_host_context*>(context);
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int64_t current_block_number = host->tx_context.block_number;
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auto example_block_hash = evmc_bytes32{};
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if (number < current_block_number && number >= current_block_number - 256)
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example_block_hash = {{1, 1, 1, 1}};
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return example_block_hash;
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}
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static void emit_log(evmc_context* context,
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const evmc_address* address,
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const uint8_t* data,
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size_t data_size,
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const evmc_bytes32 topics[],
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size_t topics_count)
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{
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(void)context;
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(void)address;
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(void)data;
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(void)data_size;
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(void)topics;
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(void)topics_count;
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}
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static const evmc_host_interface interface = {
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account_exists, get_storage, set_storage, get_balance, get_code_size, get_code_hash,
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copy_code, selfdestruct, call, get_tx_context, get_block_hash, emit_log,
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};
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example_host_context::example_host_context() : evmc_context{&interface} {}
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extern "C" {
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evmc_context* example_host_create_context()
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{
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return new example_host_context;
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return new ExampleHost;
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}
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void example_host_destroy_context(evmc_context* context)
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{
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delete context;
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delete static_cast<ExampleHost*>(context);
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}
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}
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