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pypph.cpp
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pypph.cpp
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/*
* Copyright 2020 Rene Sugar. All rights reserved.
*
* 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.
*/
/*
* @file pypph.cpp
* @author Rene Sugar <[email protected]>
* @brief Creates an order-preserving perfect hash function for a list of strings
*/
#include "pypph.h"
PphKeyFunctions::PphKeyFunctions() {
m_uuids.push_back("F80F007A-26C3-4BD0-A481-24EE9AE94D01"); // "crc64"
m_uuids.push_back("BCC54D42-34F0-43FF-88EB-59C7B47EE210"); // "djb_hash"
m_uuids.push_back("87333E59-7C1A-4613-9C6F-81F1BB1F6AED"); // "fnv64a_hash"
m_uuids.push_back("3AC2A805-6771-4189-8C62-5F41297126FE"); // "oat_hash"
m_uuids.push_back("A647F03D-A02E-477F-9635-420F3BCEB394"); // "spookyV2_hash"
}
PphKeyFunctions::~PphKeyFunctions() {
}
std::vector<std::string> PphKeyFunctions::getKeys() {
return this->m_uuids;
}
std::string PphKeyFunctions::name(const std::string& uuid) {
if (uuid == "F80F007A-26C3-4BD0-A481-24EE9AE94D01") {
return "crc64";
} else if (uuid == "BCC54D42-34F0-43FF-88EB-59C7B47EE210") {
return "djb_hash";
} else if (uuid == "87333E59-7C1A-4613-9C6F-81F1BB1F6AED") {
return "fnv64a_hash";
} else if (uuid == "3AC2A805-6771-4189-8C62-5F41297126FE") {
return "oat_hash";
} else if (uuid == "A647F03D-A02E-477F-9635-420F3BCEB394") {
return "spookyV2_hash";
}
return "unknown";
}
uint64_t PphRandomNumber::next() {
return dist(random_gen);
}
PphHashTable::PphHashTable() {
m_table = new pph::Table();
m_uuid = "BCC54D42-34F0-43FF-88EB-59C7B47EE210"; // djb_hash
m_use_loading_factor = false;
m_loading_factor = pph::DEFAULT_LOADING_FACTOR;
m_timeout = pph::DEFAULT_TIMEOUT;
m_seed = 0;
m_multiplier = pph::HASH_MULTIPLIER;
m_adjustment = 0;
m_initialized = false;
}
PphHashTable::~PphHashTable() {
delete this->m_table;
}
std::vector<std::string> PphHashTable::getKeys() {
// return list of keys (wrap std::vector in Python list)
return this->m_keys;
}
std::string& PphHashTable::getUuid() {
return this->m_uuid;
}
void PphHashTable::setUuid(std::string& uuid) {
this->m_uuid = uuid;
}
double PphHashTable::getLoadingFactor() {
return this->m_loading_factor;
}
void PphHashTable::setLoadingFactor(double value) {
this->m_loading_factor = value;
}
uint64_t PphHashTable::getTimeout() {
return this->m_timeout;
}
void PphHashTable::setTimeout(uint64_t value) {
this->m_timeout = value;
}
uint64_t PphHashTable::getSeed() {
return this->m_seed;
}
void PphHashTable::setSeed(uint64_t value) {
this->m_seed = value;
}
uint64_t PphHashTable::getMultiplier() {
return this->m_multiplier;
}
void PphHashTable::setMultiplier(uint64_t value) {
this->m_multiplier = value;
}
uint64_t PphHashTable::getAdjustment() {
return this->m_adjustment;
}
void PphHashTable::setAdjustment(uint64_t value) {
this->m_adjustment = value;
}
bool PphHashTable::contains(std::string& key) {
int val = this->m_table->find_val(key);
if (this->m_table->notfound_val(val)) {
return false;
}
return true;
}
py::object PphHashTable::getitem(std::string& key) {
if (this->m_initialized == false) {
throw pybind11::key_error();
}
uint64_t val = this->m_table->find_val(key);
if (this->m_table->notfound_val(val)) {
// https://pybind11.readthedocs.io/en/stable/advanced/exceptions.html
throw pybind11::key_error();
}
return this->m_values[val];
}
void PphHashTable::setitem(std::string& key, py::object value) {
py::gil_scoped_acquire gil;
if (this->m_initialized == true) {
throw pybind11::value_error();
}
m_keys.push_back(key);
m_values.push_back(value);
}
void PphHashTable::delitem(std::string& key) {
// Hash table is loaded and then built; values do not change
throw pybind11::key_error();
}
bool PphHashTable::load(py::object pystream) {
if (this->m_initialized == true) {
// Cannot reuse hash table to create a new one once it has been initialized.
return false;
}
this->m_initialized = true;
if (!(py::hasattr(pystream, "readinto"))) {
throw py::type_error("PphHashTable::load(pystream): incompatible function argument: `pystream` must be a file-like object, but `"
+ (std::string)(py::repr(pystream)) + "` provided");
}
py::detail::ipythonbuf buf(pystream);
std::istream cpp_stream(&buf);
bool status = m_table->unserialize(cpp_stream);
if (status == true) {
uint64_t val = 0;
this->m_keys.reserve(m_table->keys().size());
this->m_keys.resize(m_table->keys().size());
this->m_index_values.reserve(m_table->keys().size());
this->m_index_values.resize(m_table->keys().size());
this->m_values.reserve(m_table->keys().size());
this->m_values.resize(m_table->keys().size());
for (uint64_t i = 0; i < m_table->keys().size(); i++) {
val = m_table->find_val(m_table->keys()[i]);
if (m_table->notfound_val(val)) {
return false;
}
m_keys.at(val) = m_table->keys()[i];
m_index_values.at(val) = val;
// Only index values are stored in the hash table
m_values.at(val) = py::int_(val);
}
}
return status;
}
bool PphHashTable::save(py::object pystream) {
if (this->m_initialized == false) {
// Cannot save hash table that has not been initialized.
return false;
}
if (!(py::hasattr(pystream, "write") && py::hasattr(pystream, "flush"))) {
throw py::type_error("PphHashTable::load(pystream): incompatible function argument: `pystream` must be a file-like object, but `"
+ (std::string)(py::repr(pystream)) + "` provided");
}
// https://pybind11.readthedocs.io/en/stable/reference.html#redirecting-c-streams
// py::scoped_ostream_redirect output{std::cout, pystream};
// return m_table->serialize(std::cout);
py::detail::pythonbuf buf(pystream);
std::ostream cpp_stream(&buf);
return m_table->serialize(cpp_stream);
}
// Call initialize() before calling getitem()
bool PphHashTable::initialize() {
py::gil_scoped_acquire gil;
if (this->m_initialized == true) {
// Cannot reuse hash table to create a new one once it has been initialized.
return false;
}
this->m_initialized = true;
pph::keyfunc_t keyfunc = pph::uuid_to_keyfunc(this->m_uuid);
this->m_table->setup(m_keys.size(),
this->m_use_loading_factor,
this->m_loading_factor,
this->m_timeout,
this->m_seed,
this->m_multiplier,
this->m_adjustment,
keyfunc);
this->m_table->set_uuid(this->m_uuid);
this->m_index_values.reserve(m_keys.size());
this->m_index_values.resize(m_keys.size());
std::iota(std::begin(this->m_index_values), std::end(this->m_index_values), 0);
return this->m_table->load(this->m_keys, this->m_index_values);
}
PYBIND11_MODULE(pph, m) {
m.doc() = "Practical Perfect Hashing module";
py::class_<PphKeyFunctions>(m, "PphKeyFunctions")
.def(py::init<>())
.def_property("keys", &PphKeyFunctions::getKeys, nullptr)
.def("name", &PphKeyFunctions::name)
;
py::class_<PphRandomNumber>(m, "PphRandomNumber")
.def(py::init<>())
.def("next", &PphRandomNumber::next)
;
py::class_<PphHashTable>(m, "PphHashTable")
.def(py::init<>())
.def_property("keys", &PphHashTable::getKeys, nullptr)
.def_property("key_function_uuid", &PphHashTable::getUuid, &PphHashTable::setUuid)
.def_property("loading_factor", &PphHashTable::getLoadingFactor, &PphHashTable::setLoadingFactor)
.def_property("timeout", &PphHashTable::getTimeout, &PphHashTable::setTimeout)
.def_property("seed", &PphHashTable::getSeed, &PphHashTable::setSeed)
.def_property("multiplier", &PphHashTable::getMultiplier, &PphHashTable::setMultiplier)
.def_property("adjustment", &PphHashTable::getAdjustment, &PphHashTable::setAdjustment)
.def("__contains__", &PphHashTable::contains)
.def("__getitem__", &PphHashTable::getitem)
.def("__setitem__", &PphHashTable::setitem)
.def("__delitem__", &PphHashTable::delitem)
.def("load", &PphHashTable::load)
.def("save", &PphHashTable::save)
.def("initialize", &PphHashTable::initialize)
;
m.attr("__version__") = py::make_tuple(0, 2, 0, "alpha", 0);
m.attr("__version__") = "0.2.0";
m.attr("__author__") = "Rene Sugar";
m.attr("__email__") = "[email protected]";
}