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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "idstring.h"
#include "idstringexception.h"
#include <vespa/document/bucket/bucketid.h>
#include <vespa/vespalib/util/md5.h>
#include <vespa/vespalib/util/stringfmt.h>
#include <cstring>
#include <charconv>
using vespalib::string;
using vespalib::stringref;
using vespalib::make_string;
namespace document {
VESPA_IMPLEMENT_EXCEPTION(IdParseException, vespalib::Exception);
namespace {
void reportError(const char* part) __attribute__((noinline));
void reportTooShortDocId(const char * id, size_t sz) __attribute__((noinline));
void reportNoSchemeSeparator(const char * id) __attribute__((noinline));
void reportNoId(const char * id) __attribute__((noinline));
void
reportError(const char* part) {
throw IdParseException(make_string("Unparseable id: No %s separator ':' found", part), VESPA_STRLOC);
}
void
reportNoSchemeSeparator(const char * id) {
throw IdParseException(make_string("Unparseable id '%s': No scheme separator ':' found", id), VESPA_STRLOC);
}
void
reportNoId(const char * id){
throw IdParseException(make_string("Unparseable id '%s': No 'id:' found", id), VESPA_STRLOC);
}
void
reportTooShortDocId(const char * id, size_t sz) {
throw IdParseException( make_string( "Unparseable id '%s': It is too short(%li) " "to make any sense", id, sz), VESPA_STRLOC);
}
union TwoByte {
char asChar[2];
uint16_t as16;
};
union FourByte {
char asChar[4];
uint32_t as32;
};
constexpr FourByte G_null = {{'n', 'u', 'l', 'l'}};
constexpr TwoByte G_id = {{'i', 'd'}};
const char *
fmemchr(const char * s, const char * e) noexcept {
return static_cast<const char *>(memchr(s, ':', e - s));
}
// Avoid issues with primitive alignment when reading from buffer.
// Requires caller to ensure buffer is big enough to read from.
template <typename T>
constexpr T read_unaligned(const char* buf) noexcept
{
T tmp;
memcpy(&tmp, buf, sizeof(T));
return tmp;
}
void
verifyIdString(const char * id, size_t sz_)
{
if (sz_ > 4) [[likely]] {
if ((G_id.as16 == read_unaligned<uint16_t>(id)) && (id[2] == ':')) [[likely]] {
return;
} else if ((sz_ == 6) && (G_null.as32 == read_unaligned<uint32_t>(id)) && (id[4] == ':') && (id[5] == ':')) {
reportNoId(id);
} else if (sz_ > 8) {
reportNoSchemeSeparator(id);
} else {
reportTooShortDocId(id, 8);
}
} else {
reportTooShortDocId(id, 5);
}
}
void
validate(uint16_t numComponents)
{
if (numComponents < 2) {
reportError("namespace");
}
if (numComponents < 3) {
reportError("document type");
}
if (numComponents < 4) {
reportError("key/value-pairs");
}
}
constexpr uint32_t NAMESPACE_OFFSET = 3;
constexpr vespalib::stringref DEFAULT_ID("id::::", 6);
union LocationUnion {
uint8_t _key[16];
IdString::LocationType _location[2];
};
uint64_t
parseNumber(stringref s) {
uint64_t n(0);
auto res = std::from_chars(s.data(), s.data() + s.size(), n, 10);
if (res.ptr != s.data() + s.size()) [[unlikely]]{
throw IdParseException("'n'-value must be a 64-bit number. It was " + s, VESPA_STRLOC);
}
if (res.ec == std::errc::result_out_of_range) [[unlikely]] {
throw IdParseException("'n'-value out of range (" + s + ")", VESPA_STRLOC);
}
return n;
}
void
setLocation(IdString::LocationType &loc, IdString::LocationType val,
bool &has_set_location, stringref key_values) {
if (has_set_location) [[unlikely]] {
throw IdParseException("Illegal key combination in " + key_values);
}
loc = val;
has_set_location = true;
}
} // namespace
const IdString::Offsets IdString::Offsets::DefaultID(DEFAULT_ID);
IdString::Offsets::Offsets(stringref id) noexcept
: _offsets()
{
compute(id);
}
uint16_t
IdString::Offsets::compute(stringref id)
{
_offsets[0] = NAMESPACE_OFFSET;
size_t index(1);
const char * s(id.data() + NAMESPACE_OFFSET);
const char * e(id.data() + id.size());
for(s=fmemchr(s, e);
(s != nullptr) && (index < MAX_COMPONENTS);
s = fmemchr(s+1, e))
{
_offsets[index++] = s - id.data() + 1;
}
uint16_t numComponents = index;
for (;index < VESPA_NELEMS(_offsets); index++) {
_offsets[index] = id.size() + 1; // 1 is added due to the implicitt accounting for ':'
}
return numComponents;
}
IdString::LocationType
IdString::makeLocation(stringref s) {
LocationUnion location;
fastc_md5sum(reinterpret_cast<const unsigned char*>(s.data()), s.size(), location._key);
return location._location[0];
}
IdString::IdString()
: _rawId(DEFAULT_ID),
_location(0),
_offsets(Offsets::DefaultID),
_groupOffset(0),
_has_number(false)
{
}
IdString::IdString(stringref id)
: _rawId(id),
_location(0),
_offsets(),
_groupOffset(0),
_has_number(false)
{
// TODO(magnarn): Require that keys are lexicographically ordered.
verifyIdString(id.data(), id.size());
validate(_offsets.compute(id));
stringref key_values(getComponent(2));
char key(0);
string::size_type pos = 0;
bool has_set_location = false;
bool hasFoundKey(false);
for (string::size_type i = 0; i < key_values.size(); ++i) {
if (!hasFoundKey && (key_values[i] == '=')) {
key = key_values[i-1];
pos = i + 1;
hasFoundKey = true;
} else if (key_values[i] == ',' || i == key_values.size() - 1) {
stringref value(key_values.substr(pos, i - pos + (i == key_values.size() - 1)));
if (key == 'n') {
char tmp=value[value.size()];
const_cast<char &>(value[value.size()]) = 0;
setLocation(_location, parseNumber(value), has_set_location, key_values);
_has_number = true;
const_cast<char &>(value[value.size()]) = tmp;
} else if (key == 'g') {
setLocation(_location, makeLocation(value), has_set_location, key_values);
_groupOffset = offset(2) + pos;
} else {
throw IdParseException(make_string("Illegal key '%c'", key));
}
pos = i + 1;
hasFoundKey = false;
}
}
if (!has_set_location) {
_location = makeLocation(getNamespaceSpecific());
}
}
} // document
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