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binding.cpp
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#include "binding.hpp"
#include <sstream>
#include <cmath>
#include <cassert>
#include <limits>
#include <algorithm>
#include <memory>
#include <protozero/pbf_writer.hpp>
#include <protozero/pbf_reader.hpp>
namespace carmen {
using namespace v8;
Nan::Persistent<FunctionTemplate> Cache::constructor;
inline std::string shard(uint64_t level, uint64_t id) {
if (level == 0) return "0";
unsigned int bits = 52 - (static_cast<unsigned int>(level) * 4);
unsigned int shard_id = static_cast<unsigned int>(std::floor(id / static_cast<double>(std::pow(2, bits))));
return std::to_string(shard_id);
}
inline std::vector<unsigned> arrayToVector(Local<Array> const& array) {
std::vector<unsigned> cpp_array;
cpp_array.reserve(array->Length());
for (uint32_t i = 0; i < array->Length(); i++) {
int64_t js_value = array->Get(i)->IntegerValue();
if (js_value < 0 || js_value >= std::numeric_limits<unsigned>::max()) {
std::stringstream s;
s << "value in array too large (cannot fit '" << js_value << "' in unsigned)";
throw std::runtime_error(s.str());
}
cpp_array.emplace_back(static_cast<unsigned>(js_value));
}
return cpp_array;
}
inline Local<Array> vectorToArray(Cache::intarray const& vector) {
std::size_t size = vector.size();
Local<Array> array = Nan::New<Array>(static_cast<int>(size));
for (uint32_t i = 0; i < size; i++) {
array->Set(i, Nan::New<Number>(vector[i]));
}
return array;
}
inline Local<Object> mapToObject(std::map<std::uint64_t,std::uint64_t> const& map) {
Local<Object> object = Nan::New<Object>();
for (auto const& item : map) {
object->Set(Nan::New<Number>(item.first), Nan::New<Number>(item.second));
}
return object;
}
inline std::string cacheGet(Cache const* c, std::string const& key) {
Cache::message_cache const& messages = c->msg_;
Cache::message_cache::const_iterator mitr = messages.find(key);
return mitr->second->second;
}
inline bool cacheHas(Cache const* c, std::string const& key) {
Cache::message_cache const& messages = c->msg_;
Cache::message_cache::const_iterator mitr = messages.find(key);
return mitr != messages.end();
}
inline void cacheInsert(Cache & c, std::string const& key, const char * data, std::size_t data_size) {
Cache::message_cache &messages = c.msg_;
Cache::message_cache::iterator mitr = messages.find(key);
if (mitr == messages.end()) {
Cache::message_list &list = c.msglist_;
list.emplace_front(key, std::string(data,data_size));
messages.emplace(key, list.begin());
if (list.size() > c.cachesize) {
messages.erase(list.back().first);
list.pop_back();
}
}
}
inline bool cacheRemove(Cache * c, std::string const& key) {
Cache::message_list &list = c->msglist_;
Cache::message_cache &messages = c->msg_;
Cache::message_cache::iterator mitr = messages.find(key);
if (mitr != messages.end()) {
list.erase(mitr->second);
messages.erase(mitr);
return true;
} else {
return false;
}
}
Cache::intarray __get(Cache const* c, std::string const& type, std::string const& shard, uint64_t id) {
std::string key = type + "-" + shard;
Cache::memcache const& mem = c->cache_;
Cache::memcache::const_iterator itr = mem.find(key);
Cache::intarray array;
if (itr == mem.end()) {
if (!cacheHas(c, key)) return array;
std::string ref = cacheGet(c, key);
protozero::pbf_reader message(ref);
while (message.next(CACHE_MESSAGE)) {
protozero::pbf_reader item = message.get_message();
while (item.next(CACHE_ITEM)) {
uint64_t key_id = item.get_uint64();
if (key_id != id) break;
item.next();
auto vals = item.get_packed_uint64();
uint64_t lastval = 0;
// delta decode values.
for (auto it = vals.first; it != vals.second; ++it) {
if (lastval == 0) {
lastval = *it;
array.emplace_back(lastval);
} else {
lastval = lastval - *it;
array.emplace_back(lastval);
}
}
return array;
}
}
return array;
} else {
Cache::arraycache::const_iterator aitr = itr->second.find(id);
if (aitr == itr->second.end()) {
return array;
} else {
return aitr->second;
}
}
}
Cache::intarray __getTruncated(Cache const* c, std::string const& type, std::string const& shard, uint64_t id, uint64_t truncate) {
std::string key = type + "-" + shard;
Cache::memcache const& mem = c->cache_;
Cache::memcache::const_iterator itr = mem.find(key);
Cache::intarray array;
if (itr == mem.end()) {
if (!cacheHas(c, key)) return array;
std::string ref = cacheGet(c, key);
protozero::pbf_reader message(ref);
while (message.next(CACHE_MESSAGE)) {
protozero::pbf_reader item = message.get_message();
while (item.next(CACHE_ITEM)) {
uint64_t key_id = item.get_uint64();
if (key_id != id) break;
item.next();
auto vals = item.get_packed_uint64();
uint64_t lastval = 0;
uint64_t length = 0;
// delta decode values.
for (auto it = vals.first; it != vals.second; ++it) {
if (lastval == 0) {
lastval = *it;
array.emplace_back(lastval);
} else {
lastval = lastval - *it;
array.emplace_back(lastval);
}
length++;
if (length >= truncate) break;
}
return array;
}
}
return array;
} else {
Cache::arraycache::const_iterator aitr = itr->second.find(id);
if (aitr == itr->second.end()) {
return array;
} else {
return aitr->second;
}
}
}
void Cache::Initialize(Handle<Object> target) {
Nan::HandleScope scope;
Local<FunctionTemplate> t = Nan::New<FunctionTemplate>(Cache::New);
t->InstanceTemplate()->SetInternalFieldCount(1);
t->SetClassName(Nan::New("Cache").ToLocalChecked());
Nan::SetPrototypeMethod(t, "has", has);
Nan::SetPrototypeMethod(t, "loadSync", loadSync);
Nan::SetPrototypeMethod(t, "pack", pack);
Nan::SetPrototypeMethod(t, "merge", merge);
Nan::SetPrototypeMethod(t, "list", list);
Nan::SetPrototypeMethod(t, "_set", _set);
Nan::SetPrototypeMethod(t, "_get", _get);
Nan::SetPrototypeMethod(t, "unload", unload);
Nan::SetMethod(t, "coalesce", coalesce);
target->Set(Nan::New("Cache").ToLocalChecked(), t->GetFunction());
constructor.Reset(t);
}
Cache::Cache()
: ObjectWrap(),
cache_(),
msg_() {}
Cache::~Cache() { }
NAN_METHOD(Cache::pack)
{
if (info.Length() < 1) {
return Nan::ThrowTypeError("expected two info: 'type', 'shard'");
}
if (!info[0]->IsString()) {
return Nan::ThrowTypeError("first argument must be a String");
}
if (!info[1]->IsNumber()) {
return Nan::ThrowTypeError("second arg must be an Integer");
}
try {
std::string type = *String::Utf8Value(info[0]->ToString());
std::string shard = *String::Utf8Value(info[1]->ToString());
std::string key = type + "-" + shard;
Cache* c = node::ObjectWrap::Unwrap<Cache>(info.This());
Cache::memcache const& mem = c->cache_;
Cache::memcache::const_iterator itr = mem.find(key);
if (itr != mem.end()) {
std::string message;
// Optimization idea: pre-pass on arrays to assemble guess about
// how long the final message will be in order to be able to call
// message.reserve(<length>)
protozero::pbf_writer writer(message);
for (auto const& item : itr->second) {
std::size_t array_size = item.second.size();
if (array_size > 0) {
protozero::pbf_writer item_writer(writer,1);
item_writer.add_uint64(1,item.first);
// make copy of intarray so we can sort without
// modifying the original array
Cache::intarray varr = item.second;
// delta-encode values, sorted in descending order.
std::sort(varr.begin(), varr.end(), std::greater<uint64_t>());
// Using new (in protozero 1.3.0) packed writing API
// https://github.com/mapbox/protozero/commit/4e7e32ac5350ea6d3dcf78ff5e74faeee513a6e1
protozero::packed_field_uint64 field{item_writer, 2};
uint64_t lastval = 0;
for (auto const& vitem : varr) {
if (lastval == 0) {
field.add_element(static_cast<uint64_t>(vitem));
} else {
field.add_element(static_cast<uint64_t>(lastval - vitem));
}
lastval = vitem;
}
}
}
if (message.empty()) {
return Nan::ThrowTypeError("pack: invalid message ByteSize encountered");
} else {
info.GetReturnValue().Set(Nan::CopyBuffer(message.data(), message.size()).ToLocalChecked());
return;
}
} else {
if (!cacheHas(c, key)) {
return Nan::ThrowTypeError("pack: cannot pack empty data");
} else {
std::string ref = cacheGet(c, key);
Local<Object> buf = Nan::CopyBuffer((char*)ref.data(), ref.size()).ToLocalChecked();
info.GetReturnValue().Set(buf);
return;
}
}
} catch (std::exception const& ex) {
return Nan::ThrowTypeError(ex.what());
}
info.GetReturnValue().Set(Nan::Undefined());
return;
}
struct MergeBaton : carmen::noncopyable {
uv_work_t request;
std::unique_ptr<std::string> pbf3;
const char * pbf1_data;
const char * pbf2_data;
std::string method;
std::string error;
Nan::Persistent<v8::Function> callback;
Nan::Persistent<v8::Object> buffer1;
Nan::Persistent<v8::Object> buffer2;
std::size_t pbf1_size;
std::size_t pbf2_size;
MergeBaton(Local<Object> obj1,
Local<Object> obj2,
Local<Value> cb,
std::string const& meth)
: pbf1_data(node::Buffer::Data(obj1)),
pbf1_size(node::Buffer::Length(obj1)),
pbf2_data(node::Buffer::Data(obj2)),
pbf2_size(node::Buffer::Length(obj2)),
pbf3(std::make_unique<std::string>()),
method(meth)
{
this->request.data = this;
callback.Reset(cb.As<Function>());
buffer1.Reset(obj1);
buffer2.Reset(obj2);
// Reserve memory at least at pbf1_size. TODO: should we reserve more?
pbf3.get()->reserve(pbf1_size);
}
~MergeBaton() {
callback.Reset();
buffer1.Reset();
buffer2.Reset();
}
};
void mergeQueue(uv_work_t* req) {
MergeBaton *baton = static_cast<MergeBaton *>(req->data);
std::string const& method = baton->method;
// Ids that have been seen
std::map<uint64_t,bool> ids1;
std::map<uint64_t,bool> ids2;
std::string & merged = *baton->pbf3.get();
try {
protozero::pbf_writer writer(merged);
// Store ids from 1
protozero::pbf_reader pre1(baton->pbf1_data,baton->pbf1_size);
while (pre1.next(CACHE_MESSAGE)) {
protozero::pbf_reader item = pre1.get_message();
while (item.next(CACHE_ITEM)) {
ids1.emplace(item.get_uint64(), true);
}
}
// Store ids from 2
protozero::pbf_reader pre2(baton->pbf2_data,baton->pbf2_size);
while (pre2.next(CACHE_MESSAGE)) {
protozero::pbf_reader item = pre2.get_message();
while (item.next(CACHE_ITEM)) {
ids2.emplace(item.get_uint64(), true);
}
}
// No delta writes from message1
protozero::pbf_reader message1(baton->pbf1_data,baton->pbf1_size);
while (message1.next(CACHE_MESSAGE)) {
protozero::pbf_writer item_writer(writer,1);
protozero::pbf_reader item = message1.get_message();
while (item.next(CACHE_ITEM)) {
uint64_t key_id = item.get_uint64();
// Skip this id if also in message 2
if (ids2.find(key_id) != ids2.end()) break;
item_writer.add_uint64(1,key_id);
item.next();
protozero::packed_field_uint64 field{item_writer, 2};
auto vals = item.get_packed_uint64();
for (auto it = vals.first; it != vals.second; ++it) {
field.add_element(static_cast<uint64_t>(*it));
}
}
}
// No delta writes from message2
protozero::pbf_reader message2(baton->pbf2_data,baton->pbf2_size);
while (message2.next(CACHE_MESSAGE)) {
protozero::pbf_writer item_writer(writer,1);
protozero::pbf_reader item = message2.get_message();
while (item.next(CACHE_ITEM)) {
uint64_t key_id = item.get_uint64();
// Skip this id if also in message 2
if (ids1.find(key_id) != ids1.end()) break;
item_writer.add_uint64(1,key_id);
item.next();
protozero::packed_field_uint64 field{item_writer, 2};
auto vals = item.get_packed_uint64();
for (auto it = vals.first; it != vals.second; ++it) {
field.add_element(static_cast<uint64_t>(*it));
}
}
}
// Delta writes for ids in both message1 and message2
protozero::pbf_reader overlap1(baton->pbf1_data,baton->pbf1_size);
while (overlap1.next(CACHE_MESSAGE)) {
protozero::pbf_writer item_writer(writer,1);
protozero::pbf_reader item = overlap1.get_message();
while (item.next(CACHE_ITEM)) {
uint64_t key_id = item.get_uint64();
// Skip ids that are only in one or the other lists
if (ids1.find(key_id) == ids1.end() || ids2.find(key_id) == ids2.end()) break;
item_writer.add_uint64(1,key_id);
item.next();
uint64_t lastval = 0;
Cache::intarray varr;
// Add values from pbf1
auto vals = item.get_packed_uint64();
for (auto it = vals.first; it != vals.second; ++it) {
if (method == "freq") {
varr.emplace_back(*it);
break;
} else if (lastval == 0) {
lastval = *it;
varr.emplace_back(lastval);
} else {
lastval = lastval - *it;
varr.emplace_back(lastval);
}
}
// Check pbf2 for this id and merge its items if found
protozero::pbf_reader overlap2(baton->pbf2_data,baton->pbf2_size);
while (overlap2.next(CACHE_MESSAGE)) {
protozero::pbf_reader item2 = overlap2.get_message();
while (item2.next(CACHE_ITEM)) {
uint64_t key_id2 = item2.get_uint64();
if (key_id2 != key_id) break;
item2.next();
lastval = 0;
auto vals2 = item2.get_packed_uint64();
for (auto it = vals2.first; it != vals2.second; ++it) {
if (method == "freq") {
if (key_id2 == 1) {
varr[0] = varr[0] > *it ? varr[0] : *it;
} else {
varr[0] = varr[0] + *it;
}
break;
} else if (lastval == 0) {
lastval = *it;
varr.emplace_back(lastval);
} else {
lastval = lastval - *it;
varr.emplace_back(lastval);
}
}
}
}
// Sort for proper delta encoding
std::sort(varr.begin(), varr.end(), std::greater<uint64_t>());
// Write varr to merged protobuf
protozero::packed_field_uint64 field{item_writer, 2};
lastval = 0;
for (auto const& vitem : varr) {
if (lastval == 0) {
field.add_element(static_cast<uint64_t>(vitem));
} else {
field.add_element(static_cast<uint64_t>(lastval - vitem));
}
lastval = vitem;
}
}
}
} catch (std::exception const& ex) {
baton->error = ex.what();
}
}
void mergeAfter(uv_work_t* req) {
Nan::HandleScope scope;
MergeBaton *baton = static_cast<MergeBaton *>(req->data);
if (!baton->error.empty()) {
v8::Local<v8::Value> argv[1] = { Nan::Error(baton->error.c_str()) };
Nan::MakeCallback(Nan::GetCurrentContext()->Global(), Nan::New(baton->callback), 1, argv);
} else {
std::string & merged = *baton->pbf3.get();
baton->pbf3.release();
v8::Local<v8::Value> argv[2] = { Nan::Null(),
Nan::NewBuffer(&merged[0],
merged.size(),
[](char *, void * hint) {
delete reinterpret_cast<std::string*>(hint);
},
baton->pbf3.get()
).ToLocalChecked()
};
Nan::MakeCallback(Nan::GetCurrentContext()->Global(), Nan::New(baton->callback), 2, argv);
}
delete baton;
}
NAN_METHOD(Cache::list)
{
if (info.Length() < 1) {
return Nan::ThrowTypeError("expected at least one arg: 'type' and optional a 'shard'");
}
if (!info[0]->IsString()) {
return Nan::ThrowTypeError("first argument must be a String");
}
try {
std::string type = *String::Utf8Value(info[0]->ToString());
Cache* c = node::ObjectWrap::Unwrap<Cache>(info.This());
Cache::memcache const& mem = c->cache_;
Cache::message_cache const& messages = c->msg_;
Local<Array> ids = Nan::New<Array>();
if (info.Length() == 1) {
unsigned idx = 0;
std::size_t type_size = type.size();
for (auto const& item : mem) {
std::size_t item_size = item.first.size();
if (item_size > type_size && item.first.substr(0,type_size) == type) {
std::string shard = item.first.substr(type_size+1,item_size);
ids->Set(idx++, Nan::New(Nan::New(shard.c_str()).ToLocalChecked()->NumberValue()));
}
}
for (auto const& item : messages) {
std::size_t item_size = item.first.size();
if (item_size > type_size && item.first.substr(0,type_size) == type) {
std::string shard = item.first.substr(type_size+1,item_size);
ids->Set(idx++, Nan::New(Nan::New(shard.c_str()).ToLocalChecked()->NumberValue()));
}
}
info.GetReturnValue().Set(ids);
return;
} else if (info.Length() == 2) {
std::string shard = *String::Utf8Value(info[1]->ToString());
std::string key = type + "-" + shard;
Cache::memcache::const_iterator itr = mem.find(key);
unsigned idx = 0;
if (itr != mem.end()) {
for (auto const& item : itr->second) {
ids->Set(idx++,Nan::New<Number>(item.first)->ToString());
}
}
// parse message for ids
if (cacheHas(c, key)) {
std::string ref = cacheGet(c, key);
protozero::pbf_reader message(ref);
while (message.next(CACHE_MESSAGE)) {
protozero::pbf_reader item = message.get_message();
while (item.next(CACHE_ITEM)) {
uint64_t key_id = item.get_uint64();
ids->Set(idx++, Nan::New<Number>(key_id)->ToString());
}
}
}
info.GetReturnValue().Set(ids);
return;
}
} catch (std::exception const& ex) {
return Nan::ThrowTypeError(ex.what());
}
info.GetReturnValue().Set(Nan::Undefined());
return;
}
NAN_METHOD(Cache::merge)
{
if (!info[0]->IsObject()) return Nan::ThrowTypeError("argument 1 must be a Buffer");
if (!info[1]->IsObject()) return Nan::ThrowTypeError("argument 2 must be a Buffer");
if (!info[2]->IsString()) return Nan::ThrowTypeError("argument 3 must be a String");
if (!info[3]->IsFunction()) return Nan::ThrowTypeError("argument 3 must be a callback function");
Local<Object> obj1 = info[0]->ToObject();
Local<Object> obj2 = info[1]->ToObject();
Local<Value> callback = info[3];
std::string method = *String::Utf8Value(info[2]->ToString());
if (obj1->IsNull() || obj1->IsUndefined() || !node::Buffer::HasInstance(obj1)) return Nan::ThrowTypeError("argument 1 must be a Buffer");
if (obj2->IsNull() || obj2->IsUndefined() || !node::Buffer::HasInstance(obj2)) return Nan::ThrowTypeError("argument 2 must be a Buffer");
MergeBaton *baton = new MergeBaton(obj1,obj2,callback,method);
uv_queue_work(uv_default_loop(), &baton->request, mergeQueue, (uv_after_work_cb)mergeAfter);
info.GetReturnValue().Set(Nan::Undefined());
return;
}
NAN_METHOD(Cache::_set)
{
if (info.Length() < 3) {
return Nan::ThrowTypeError("expected four info: 'type', 'shard', 'id', 'data'");
}
if (!info[0]->IsString()) {
return Nan::ThrowTypeError("first argument must be a String");
}
if (!info[1]->IsNumber()) {
return Nan::ThrowTypeError("second arg must be an Integer");
}
if (!info[2]->IsNumber()) {
return Nan::ThrowTypeError("third arg must be an Integer");
}
if (!info[3]->IsArray()) {
return Nan::ThrowTypeError("fourth arg must be an Array");
}
Local<Array> data = Local<Array>::Cast(info[3]);
if (data->IsNull() || data->IsUndefined()) {
return Nan::ThrowTypeError("an array expected for fourth argument");
}
try {
std::string type = *String::Utf8Value(info[0]->ToString());
std::string shard = *String::Utf8Value(info[1]->ToString());
std::string key = type + "-" + shard;
Cache* c = node::ObjectWrap::Unwrap<Cache>(info.This());
Cache::memcache & mem = c->cache_;
Cache::memcache::const_iterator itr = mem.find(key);
if (itr == mem.end()) {
c->cache_.emplace(key,Cache::arraycache());
}
Cache::arraycache & arrc = c->cache_[key];
Cache::arraycache::key_type key_id = static_cast<Cache::arraycache::key_type>(info[2]->IntegerValue());
Cache::arraycache::iterator itr2 = arrc.find(key_id);
if (itr2 == arrc.end()) {
arrc.emplace(key_id,Cache::intarray());
}
Cache::intarray & vv = arrc[key_id];
unsigned array_size = data->Length();
if (info[4]->IsBoolean() && info[4]->BooleanValue()) {
vv.reserve(vv.size() + array_size);
} else {
if (itr2 != arrc.end()) vv.clear();
vv.reserve(array_size);
}
for (unsigned i=0;i<array_size;++i) {
vv.emplace_back(static_cast<uint64_t>(data->Get(i)->NumberValue()));
}
} catch (std::exception const& ex) {
return Nan::ThrowTypeError(ex.what());
}
info.GetReturnValue().Set(Nan::Undefined());
return;
}
/*
Note: This function will not override data for keys already inserted into the cache
*/
NAN_METHOD(Cache::loadSync)
{
if (info.Length() < 2) {
return Nan::ThrowTypeError("expected at least three args: 'buffer', 'type', and 'shard'");
}
if (!info[0]->IsObject()) {
return Nan::ThrowTypeError("first argument must be a Buffer");
}
Local<Object> obj = info[0]->ToObject();
if (obj->IsNull() || obj->IsUndefined()) {
return Nan::ThrowTypeError("a buffer expected for first argument");
}
if (!node::Buffer::HasInstance(obj)) {
return Nan::ThrowTypeError("first argument must be a Buffer");
}
if (!info[1]->IsString()) {
return Nan::ThrowTypeError("second arg 'type' must be a String");
}
if (!info[2]->IsNumber()) {
return Nan::ThrowTypeError("third arg 'shard' must be an Integer");
}
try {
std::string type = *String::Utf8Value(info[1]->ToString());
std::string shard = *String::Utf8Value(info[2]->ToString());
std::string key = type + "-" + shard;
Cache & c = *node::ObjectWrap::Unwrap<Cache>(info.This());
cacheInsert(c, key, node::Buffer::Data(obj), node::Buffer::Length(obj));
} catch (std::exception const& ex) {
return Nan::ThrowTypeError(ex.what());
}
info.GetReturnValue().Set(Nan::Undefined());
return;
}
NAN_METHOD(Cache::has)
{
if (info.Length() < 2) {
return Nan::ThrowTypeError("expected two info: 'type' and 'shard'");
}
if (!info[0]->IsString()) {
return Nan::ThrowTypeError("first arg must be a String");
}
if (!info[1]->IsNumber()) {
return Nan::ThrowTypeError("second arg must be an Integer");
}
try {
std::string type = *String::Utf8Value(info[0]->ToString());
std::string shard = *String::Utf8Value(info[1]->ToString());
std::string key = type + "-" + shard;
Cache* c = node::ObjectWrap::Unwrap<Cache>(info.This());
Cache::memcache const& mem = c->cache_;
Cache::memcache::const_iterator itr = mem.find(key);
if (itr != mem.end()) {
info.GetReturnValue().Set(Nan::True());
return;
} else {
if (cacheHas(c, key)) {
info.GetReturnValue().Set(Nan::True());
return;
} else {
info.GetReturnValue().Set(Nan::False());
return;
}
}
} catch (std::exception const& ex) {
return Nan::ThrowTypeError(ex.what());
}
}
NAN_METHOD(Cache::_get)
{
if (info.Length() < 3) {
return Nan::ThrowTypeError("expected three info: type, shard, and id");
}
if (!info[0]->IsString()) {
return Nan::ThrowTypeError("first arg must be a String");
}
if (!info[1]->IsNumber()) {
return Nan::ThrowTypeError("second arg must be an Integer");
}
if (!info[2]->IsNumber()) {
return Nan::ThrowTypeError("third arg must be a positive Integer");
}
try {
std::string type = *String::Utf8Value(info[0]->ToString());
std::string shard = *String::Utf8Value(info[1]->ToString());
int64_t id = info[2]->IntegerValue();
if (id < 0) {
return Nan::ThrowTypeError("third arg must be a positive Integer");
}
uint64_t id2 = static_cast<uint64_t>(id);
Cache* c = node::ObjectWrap::Unwrap<Cache>(info.This());
Cache::intarray vector = __get(c, type, shard, id2);
if (!vector.empty()) {
info.GetReturnValue().Set(vectorToArray(vector));
return;
} else {
info.GetReturnValue().Set(Nan::Undefined());
return;
}
} catch (std::exception const& ex) {
return Nan::ThrowTypeError(ex.what());
}
}
NAN_METHOD(Cache::unload)
{
if (info.Length() < 2) {
return Nan::ThrowTypeError("expected at least two info: 'type' and 'shard'");
}
if (!info[0]->IsString()) {
return Nan::ThrowTypeError("first arg must be a String");
}
if (!info[1]->IsNumber()) {
return Nan::ThrowTypeError("second arg must be an Integer");
}
bool hit = false;
try {
std::string type = *String::Utf8Value(info[0]->ToString());
std::string shard = *String::Utf8Value(info[1]->ToString());
std::string key = type + "-" + shard;
Cache* c = node::ObjectWrap::Unwrap<Cache>(info.This());
Cache::memcache & mem = c->cache_;
Cache::memcache::iterator itr = mem.find(key);
if (itr != mem.end()) {
hit = true;
mem.erase(itr);
}
hit = hit || cacheRemove(c, key);
} catch (std::exception const& ex) {
return Nan::ThrowTypeError(ex.what());
}
info.GetReturnValue().Set(Nan::New<Boolean>(hit));
return;
}
NAN_METHOD(Cache::New)
{
if (!info.IsConstructCall()) {
return Nan::ThrowTypeError("Cannot call constructor as function, you need to use 'new' keyword");
}
try {
if (info.Length() < 1) {
return Nan::ThrowTypeError("expected 'id' argument");
}
if (!info[0]->IsString()) {
return Nan::ThrowTypeError("first argument 'id' must be a String");
}
Cache* im = new Cache();
if (info[1]->IsNumber()) {
im->cachesize = static_cast<unsigned>(info[1]->NumberValue());
}
im->Wrap(info.This());
info.This()->Set(Nan::New("id").ToLocalChecked(), info[0]);
info.GetReturnValue().Set(info.This());
return;
} catch (std::exception const& ex) {
return Nan::ThrowTypeError(ex.what());
}
info.GetReturnValue().Set(Nan::Undefined());
return;
}
//relev = 5 bits
//count = 3 bits
//reason = 12 bits
//* 1 bit gap
//id = 32 bits
constexpr double _pow(double x, int y)
{
return y == 0 ? 1.0 : x * _pow(x, y-1);
}
constexpr uint64_t POW2_51 = static_cast<uint64_t>(_pow(2.0,51));
constexpr uint64_t POW2_48 = static_cast<uint64_t>(_pow(2.0,48));
constexpr uint64_t POW2_34 = static_cast<uint64_t>(_pow(2.0,34));
constexpr uint64_t POW2_28 = static_cast<uint64_t>(_pow(2.0,28));
constexpr uint64_t POW2_25 = static_cast<uint64_t>(_pow(2.0,25));
constexpr uint64_t POW2_20 = static_cast<uint64_t>(_pow(2.0,20));
constexpr uint64_t POW2_14 = static_cast<uint64_t>(_pow(2.0,14));
constexpr uint64_t POW2_3 = static_cast<uint64_t>(_pow(2.0,3));
constexpr uint64_t POW2_2 = static_cast<uint64_t>(_pow(2.0,2));
struct PhrasematchSubq {
carmen::Cache *cache;
double weight;
uint64_t phrase;
unsigned short idx;
unsigned short zoom;
uint32_t mask;
};
struct Cover {
double relev;
uint32_t id;
uint32_t tmpid;
unsigned short x;
unsigned short y;
unsigned short score;
unsigned short idx;
uint32_t mask;
unsigned distance;
double scoredist;
};
struct Context {
std::vector<Cover> coverList;
uint32_t mask;
double relev;
Context(Context const& c) = default;
Context(Cover && cov,
uint32_t mask,
double relev)
: coverList(),
mask(mask),
relev(relev) {
coverList.emplace_back(std::move(cov));
}
Context& operator=(Context && c) {
coverList = std::move(c.coverList);
mask = std::move(c.mask);
relev = std::move(c.relev);
return *this;
}
Context(std::vector<Cover> && cl,
uint32_t mask,
double relev)
: coverList(std::move(cl)),
mask(mask),
relev(relev) {}
Context(Context && c)
: coverList(std::move(c.coverList)),
mask(std::move(c.mask)),
relev(std::move(c.relev)) {}
};
Cover numToCover(uint64_t num) {
Cover cover;
assert(((num >> 34) % POW2_14) <= static_cast<double>(std::numeric_limits<unsigned short>::max()));
assert(((num >> 34) % POW2_14) >= static_cast<double>(std::numeric_limits<unsigned short>::min()));
unsigned short y = static_cast<unsigned short>((num >> 34) % POW2_14);
assert(((num >> 20) % POW2_14) <= static_cast<double>(std::numeric_limits<unsigned short>::max()));
assert(((num >> 20) % POW2_14) >= static_cast<double>(std::numeric_limits<unsigned short>::min()));
unsigned short x = static_cast<unsigned short>((num >> 20) % POW2_14);
assert(((num >> 48) % POW2_3) <= static_cast<double>(std::numeric_limits<unsigned short>::max()));
assert(((num >> 48) % POW2_3) >= static_cast<double>(std::numeric_limits<unsigned short>::min()));
unsigned short score = static_cast<unsigned short>((num >> 48) % POW2_3);
uint32_t id = static_cast<uint32_t>(num % POW2_20);
cover.x = x;
cover.y = y;
double relev = 0.4 + (0.2 * static_cast<double>((num >> 51) % POW2_2));
cover.relev = relev;
cover.score = score;
cover.id = id;
// These are not derived from decoding the input num but by
// external values after initialization.
cover.idx = 0;
cover.mask = 0;
cover.tmpid = 0;
cover.distance = 0;
return cover;
};
struct ZXY {
unsigned z;
unsigned x;
unsigned y;
};
ZXY pxy2zxy(unsigned z, unsigned x, unsigned y, unsigned target_z) {
ZXY zxy;
zxy.z = target_z;
// Interval between parent and target zoom level
unsigned zDist = target_z - z;
unsigned zMult = zDist - 1;
if (zDist == 0) {
zxy.x = x;
zxy.y = y;
return zxy;
}
// Midpoint length @ z for a tile at parent zoom level
unsigned pMid_d = static_cast<unsigned>(std::pow(2,zDist) / 2);
assert(pMid_d <= static_cast<double>(std::numeric_limits<unsigned>::max()));
assert(pMid_d >= static_cast<double>(std::numeric_limits<unsigned>::min()));
unsigned pMid = static_cast<unsigned>(pMid_d);
zxy.x = (x * zMult) + pMid;
zxy.y = (y * zMult) + pMid;
return zxy;
}
ZXY bxy2zxy(unsigned z, unsigned x, unsigned y, unsigned target_z, bool max=false) {
ZXY zxy;
zxy.z = target_z;
// Interval between parent and target zoom level
signed zDist = target_z - z;
if (zDist == 0) {
zxy.x = x;
zxy.y = y;
return zxy;
}
// zoom conversion multiplier
float mult = static_cast<float>(std::pow(2,zDist));
// zoom in min
if (zDist > 0 && !max) {
zxy.x = static_cast<unsigned>(static_cast<float>(x) * mult);
zxy.y = static_cast<unsigned>(static_cast<float>(y) * mult);
return zxy;
}
// zoom in max
else if (zDist > 0 && max) {
zxy.x = static_cast<unsigned>(static_cast<float>(x) * mult + (mult - 1));
zxy.y = static_cast<unsigned>(static_cast<float>(y) * mult + (mult - 1));
return zxy;
}
// zoom out
else {
unsigned mod = static_cast<unsigned>(std::pow(2,target_z));
unsigned xDiff = x % mod;
unsigned yDiff = y % mod;
unsigned newX = x - xDiff;
unsigned newY = y - yDiff;
zxy.x = static_cast<unsigned>(static_cast<float>(newX) * mult);
zxy.y = static_cast<unsigned>(static_cast<float>(newY) * mult);
return zxy;
}
}
inline bool coverSortByRelev(Cover const& a, Cover const& b) noexcept {
if (b.relev > a.relev) return false;
else if (b.relev < a.relev) return true;
else if (b.scoredist > a.scoredist) return false;
else if (b.scoredist < a.scoredist) return true;
else if (b.idx < a.idx) return false;
else if (b.idx > a.idx) return true;
else if (b.id < a.id) return false;
else if (b.id > a.id) return true;