ClickHouse/dbms/tests/external_dictionaries/dictionary_library/dictionary_library.cpp

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/// c++ sample dictionary library
/// proller: TODO: describe
#include <cstdint>
#include <functional>
#include <iostream>
#include <memory>
#include <sstream>
#include <vector>
#include <Dictionaries/LibraryDictionarySourceExternal.h>
//#define DUMPS(VAR) #VAR " = " << VAR
//#define DUMP(VAR) LOG(ptr->lib->log, __FILE__ << ":" << __LINE__ << " " << DUMPS(VAR));
#define LOG(logger, message) \
do \
{ \
std::stringstream builder; \
builder << message; \
(logger)(ClickHouseLibrary::INFORMATION, builder.str().c_str()); \
} while (false)
struct LibHolder
{
std::function<void(ClickHouseLibrary::LogLevel, ClickHouseLibrary::CString)> log;
//Some your data, maybe service connection
};
struct DataHolder
{
std::vector<std::vector<uint64_t>> dataHolder; // Actual data storage
std::vector<std::vector<ClickHouseLibrary::Field>> fieldHolder; // Pointers and sizes of data
std::unique_ptr<ClickHouseLibrary::Row[]> rowHolder;
ClickHouseLibrary::Table ctable; // Result data prepared for transfer via c-style interface
LibHolder * lib = nullptr;
};
void MakeColumnsFromVector(DataHolder * ptr)
{
for (const auto & row : ptr->dataHolder)
{
std::vector<ClickHouseLibrary::Field> fields;
for (const auto & field : row)
fields.push_back({&field, sizeof(field)});
ptr->fieldHolder.push_back(fields);
}
const auto rows_num = ptr->fieldHolder.size();
ptr->rowHolder = std::make_unique<ClickHouseLibrary::Row[]>(rows_num);
size_t i = 0;
for (auto & row : ptr->fieldHolder)
{
ptr->rowHolder[i].size = row.size();
ptr->rowHolder[i].data = row.data();
++i;
}
ptr->ctable.size = rows_num;
ptr->ctable.data = ptr->rowHolder.get();
}
extern "C" {
void * ClickHouseDictionary_v3_loadIds(void * data_ptr,
ClickHouseLibrary::CStrings * settings,
ClickHouseLibrary::CStrings * columns,
const struct ClickHouseLibrary::VectorUInt64 * ids)
{
auto ptr = static_cast<DataHolder *>(data_ptr);
if (ids)
LOG(ptr->lib->log, "loadIds lib call ptr=" << data_ptr << " => " << ptr << " size=" << ids->size);
if (!ptr)
return nullptr;
if (settings)
{
LOG(ptr->lib->log, "settings passed: " << settings->size);
for (size_t i = 0; i < settings->size; ++i)
{
LOG(ptr->lib->log, "setting " << i << " :" << settings->data[i]);
}
}
if (columns)
{
LOG(ptr->lib->log, "columns passed:" << columns->size);
for (size_t i = 0; i < columns->size; ++i)
{
LOG(ptr->lib->log, "column " << i << " :" << columns->data[i]);
}
}
if (ids)
{
LOG(ptr->lib->log, "ids passed: " << ids->size);
for (size_t i = 0; i < ids->size; ++i)
{
LOG(ptr->lib->log, "id " << i << " :" << ids->data[i] << " replying.");
ptr->dataHolder.emplace_back(std::vector<uint64_t>{ids->data[i], ids->data[i] + 1, (1 + ids->data[i]) * 10, 65});
}
}
MakeColumnsFromVector(ptr);
return static_cast<void *>(&ptr->ctable);
}
void * ClickHouseDictionary_v3_loadAll(void * data_ptr, ClickHouseLibrary::CStrings * settings, ClickHouseLibrary::CStrings * /*columns*/)
{
auto ptr = static_cast<DataHolder *>(data_ptr);
LOG(ptr->lib->log, "loadAll lib call ptr=" << data_ptr << " => " << ptr);
if (!ptr)
return nullptr;
if (settings)
{
LOG(ptr->lib->log, "settings passed: " << settings->size);
for (size_t i = 0; i < settings->size; ++i)
{
LOG(ptr->lib->log, "setting " << i << " :" << settings->data[i]);
}
}
for (size_t i = 0; i < 7; ++i)
{
LOG(ptr->lib->log,
"id " << i << " :"
<< " generating.");
ptr->dataHolder.emplace_back(std::vector<uint64_t>{i, i + 1, (1 + i) * 10, 65});
}
MakeColumnsFromVector(ptr);
return static_cast<void *>(&ptr->ctable);
}
void * ClickHouseDictionary_v3_loadKeys(void * data_ptr, ClickHouseLibrary::CStrings * settings, ClickHouseLibrary::Table * requested_keys)
{
auto ptr = static_cast<DataHolder *>(data_ptr);
LOG(ptr->lib->log, "loadKeys lib call ptr=" << data_ptr << " => " << ptr);
if (settings)
{
LOG(ptr->lib->log, "settings passed: " << settings->size);
for (size_t i = 0; i < settings->size; ++i)
{
LOG(ptr->lib->log, "setting " << i << " :" << settings->data[i]);
}
}
if (requested_keys)
{
LOG(ptr->lib->log, "requested_keys columns passed: " << requested_keys->size);
for (size_t i = 0; i < requested_keys->size; ++i) {
LOG(ptr->lib->log, "requested_keys at column " << i << " passed: " << requested_keys->data[i].size);
}
}
//MakeColumnsFromVector(ptr);
return nullptr;
}
void * ClickHouseDictionary_v3_libNew(
ClickHouseLibrary::CStrings * /*settings*/, void (*logFunc)(ClickHouseLibrary::LogLevel, ClickHouseLibrary::CString))
{
auto lib_ptr = new LibHolder;
lib_ptr->log = logFunc;
return lib_ptr;
}
void ClickHouseDictionary_v3_libDelete(void * lib_ptr)
{
auto ptr = static_cast<LibHolder *>(lib_ptr);
delete ptr;
return;
}
void * ClickHouseDictionary_v3_dataNew(void * lib_ptr)
{
auto data_ptr = new DataHolder;
data_ptr->lib = static_cast<decltype(data_ptr->lib)>(lib_ptr);
return data_ptr;
}
void ClickHouseDictionary_v3_dataDelete(void * /*lib_ptr*/, void * data_ptr)
{
auto ptr = static_cast<DataHolder *>(data_ptr);
delete ptr;
return;
}
}