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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "stackdumpiterator.h"
#include <vespa/vespalib/util/compress.h>
#include <vespa/vespalib/objects/nbo.h>
#include <cassert>
#include <charconv>
using search::query::PredicateQueryTerm;
namespace search {
SimpleQueryStackDumpIterator::SimpleQueryStackDumpIterator(vespalib::stringref buf)
: _buf(buf.begin()),
_bufEnd(buf.end()),
_currPos(0),
_currEnd(0),
_currType(ParseItem::ITEM_UNDEF),
_currFlags(0),
_currWeight(100),
_currUniqueId(0),
_currArity(0),
_curr_index_name(),
_curr_term(),
_curr_integer_term(0),
_extraIntArg1(0),
_extraIntArg2(0),
_extraIntArg3(0),
_extraDoubleArg4(0),
_extraDoubleArg5(0),
_predicate_query_term()
{
}
SimpleQueryStackDumpIterator::~SimpleQueryStackDumpIterator() = default;
vespalib::stringref
SimpleQueryStackDumpIterator::read_stringref(const char *&p)
{
uint64_t len;
p += vespalib::compress::Integer::decompressPositive(len, p);
if ((p + len) > _bufEnd) throw false;
vespalib::stringref result(p, len);
p += len;
return result;
}
uint64_t
SimpleQueryStackDumpIterator::readUint64(const char *&p)
{
uint64_t value;
memcpy(&value, p, sizeof(value));
p += sizeof(value);
return vespalib::nbo::n2h(value);
}
double
SimpleQueryStackDumpIterator::read_double(const char *&p)
{
double value;
memcpy(&value, p, sizeof(value));
p += sizeof(value);
return vespalib::nbo::n2h(value);
}
uint64_t
SimpleQueryStackDumpIterator::readCompressedPositiveInt(const char *&p)
{
uint64_t tmp;
p += vespalib::compress::Integer::decompressPositive(tmp, p);
if (p > _bufEnd) throw false;
return tmp;
}
bool
SimpleQueryStackDumpIterator::next() {
try {
return readNext();
} catch (...) {
return false;
}
}
bool SimpleQueryStackDumpIterator::readNext() {
if ((_buf + _currEnd) >= _bufEnd)
// End of buffer, so no more items available
return false;
// Set the position to the previous end. If just starting, sets pos to _buf
_currPos = _currEnd;
// Find an item at the current position
const char *p = _buf + _currPos;
uint8_t typefield = *p++;
_currType = ParseItem::GetType(typefield);
if (ParseItem::GetFeature_Weight(typefield)) {
int64_t tmpLong;
if (p >= _bufEnd) return false;
p += vespalib::compress::Integer::decompress(tmpLong, p);
_currWeight.setPercent(tmpLong);
if (p > _bufEnd) return false;
} else {
_currWeight.setPercent(100);
}
if (__builtin_expect(ParseItem::getFeature_UniqueId(typefield), false)) {
_currUniqueId = readCompressedPositiveInt(p);
} else {
_currUniqueId = 0;
}
if (__builtin_expect(ParseItem::getFeature_Flags(typefield), false)) {
if ((p + sizeof(uint8_t)) > _bufEnd) return false;
_currFlags = (uint8_t)*p++;
} else {
_currFlags = 0;
}
switch (_currType) {
case ParseItem::ITEM_OR:
case ParseItem::ITEM_EQUIV:
case ParseItem::ITEM_AND:
case ParseItem::ITEM_NOT:
case ParseItem::ITEM_RANK:
case ParseItem::ITEM_ANY:
_currArity = readCompressedPositiveInt(p);
_curr_index_name = vespalib::stringref();
_curr_term = vespalib::stringref();
break;
case ParseItem::ITEM_NEAR:
case ParseItem::ITEM_ONEAR:
_currArity = readCompressedPositiveInt(p);
_extraIntArg1 = readCompressedPositiveInt(p);
_curr_index_name = vespalib::stringref();
_curr_term = vespalib::stringref();
break;
case ParseItem::ITEM_WEAK_AND:
_currArity = readCompressedPositiveInt(p);
_extraIntArg1 = readCompressedPositiveInt(p); // targetNumHits
_curr_index_name = read_stringref(p);
_curr_term = vespalib::stringref();
break;
case ParseItem::ITEM_SAME_ELEMENT:
_currArity = readCompressedPositiveInt(p);
_curr_index_name = read_stringref(p);
_curr_term = vespalib::stringref();
break;
case ParseItem::ITEM_PURE_WEIGHTED_STRING:
_curr_term = read_stringref(p);
_currArity = 0;
break;
case ParseItem::ITEM_PURE_WEIGHTED_LONG:
{
if (p + sizeof(int64_t) > _bufEnd) return false;
_curr_integer_term = vespalib::nbo::n2h(*reinterpret_cast<const int64_t *>(p));
p += sizeof(int64_t);
_currArity = 0;
}
break;
case ParseItem::ITEM_WORD_ALTERNATIVES:
_curr_index_name = read_stringref(p);
_currArity = readCompressedPositiveInt(p);
_curr_term = vespalib::stringref();
break;
case ParseItem::ITEM_NUMTERM:
case ParseItem::ITEM_GEO_LOCATION_TERM:
case ParseItem::ITEM_TERM:
case ParseItem::ITEM_PREFIXTERM:
case ParseItem::ITEM_SUBSTRINGTERM:
case ParseItem::ITEM_EXACTSTRINGTERM:
case ParseItem::ITEM_SUFFIXTERM:
case ParseItem::ITEM_REGEXP:
_curr_index_name = read_stringref(p);
_curr_term = read_stringref(p);
_currArity = 0;
break;
case ParseItem::ITEM_PREDICATE_QUERY:
if ( ! readPredicate(p)) return false;
break;
case ParseItem::ITEM_WEIGHTED_SET:
case ParseItem::ITEM_DOT_PRODUCT:
case ParseItem::ITEM_WAND:
case ParseItem::ITEM_PHRASE:
if (!readComplexTerm(p)) return false;
break;
case ParseItem::ITEM_NEAREST_NEIGHBOR:
if ( ! readNN(p)) return false;
break;
case ParseItem::ITEM_FUZZY:
if (!readFuzzy(p)) return false;
break;
case ParseItem::ITEM_TRUE:
case ParseItem::ITEM_FALSE:
// no content
_currArity = 0;
break;
default:
// Unknown item, so report that no more are available
return false;
}
_currEnd = p - _buf;
// We should not have passed the buffer
return (p <= _bufEnd);
}
bool
SimpleQueryStackDumpIterator::readPredicate(const char *&p) {
_curr_index_name = read_stringref(p);
_predicate_query_term = std::make_unique<PredicateQueryTerm>();
size_t count = readCompressedPositiveInt(p);
for (size_t i = 0; i < count; ++i) {
vespalib::stringref key = read_stringref(p);
vespalib::stringref value = read_stringref(p);
if (p + sizeof(uint64_t) > _bufEnd) return false;
uint64_t sub_queries = readUint64(p);
_predicate_query_term->addFeature(key, value, sub_queries);
}
count = readCompressedPositiveInt(p);
for (size_t i = 0; i < count; ++i) {
vespalib::stringref key = read_stringref(p);
if (p + 2*sizeof(uint64_t) > _bufEnd) return false;
uint64_t value = readUint64(p);
uint64_t sub_queries = readUint64(p);
_predicate_query_term->addRangeFeature(key, value, sub_queries);
}
return true;
}
bool
SimpleQueryStackDumpIterator::readNN(const char *& p) {
_curr_index_name = read_stringref(p);
_curr_term = read_stringref(p); // query_tensor_name
_extraIntArg1 = readCompressedPositiveInt(p); // targetNumHits
_extraIntArg2 = readCompressedPositiveInt(p); // allow_approximate
_extraIntArg3 = readCompressedPositiveInt(p); // explore_additional_hits
// XXX: remove later when QRS doesn't send this extra flag
_extraIntArg2 &= ~0x40;
// QRS always sends this now:
if ((p + sizeof(double))> _bufEnd) return false;
_extraDoubleArg4 = read_double(p); // distance threshold
_currArity = 0;
return true;
}
bool
SimpleQueryStackDumpIterator::readComplexTerm(const char *& p) {
_currArity = readCompressedPositiveInt(p);
_curr_index_name = read_stringref(p);
if (_currType == ParseItem::ITEM_WAND) {
_extraIntArg1 = readCompressedPositiveInt(p); // targetNumHits
if ((p + 2*sizeof(double))> _bufEnd) return false;
_extraDoubleArg4 = read_double(p); // scoreThreshold
_extraDoubleArg5 = read_double(p); // thresholdBoostFactor
}
_curr_term = vespalib::stringref();
return true;
}
bool
SimpleQueryStackDumpIterator::readFuzzy(const char *&p) {
_curr_index_name = read_stringref(p);
_curr_term = read_stringref(p); // fuzzy term
_extraIntArg1 = readCompressedPositiveInt(p); // maxEditDistance
_extraIntArg2 = readCompressedPositiveInt(p); // prefixLength
_currArity = 0;
return true;
}
}
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