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binaryserializer.h
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binaryserializer.h
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#ifndef __BINARY_SERIALIZER__
#define __BINARY_SERIALIZER__
#include "common/armhelper.h"
#include <string>
using namespace std;
namespace swss {
class BinarySerializer {
public:
static size_t serializeBuffer(
const char* buffer,
const size_t size,
const std::string& dbName,
const std::string& tableName,
const std::vector<KeyOpFieldsValuesTuple>& kcos)
{
auto tmpSerializer = BinarySerializer(buffer, size);
// Set the first pair as DB name and table name.
tmpSerializer.setKeyAndValue(
dbName.c_str(), dbName.length(),
tableName.c_str(), tableName.length());
for (auto& kco : kcos)
{
auto& key = kfvKey(kco);
auto& fvs = kfvFieldsValues(kco);
std::string fvs_len = std::to_string(fvs.size());
// For each request, the first pair is the key and the number of attributes,
// followed by the attribute pairs.
// The operation is not set, when there is no attribute, it is a DEL request.
tmpSerializer.setKeyAndValue(
key.c_str(), key.length(),
fvs_len.c_str(), fvs_len.length());
for (auto& fv : fvs)
{
auto& field = fvField(fv);
auto& value = fvValue(fv);
tmpSerializer.setKeyAndValue(
field.c_str(), field.length(),
value.c_str(), value.length());
}
}
return tmpSerializer.finalize();
}
static void deserializeBuffer(
const char* buffer,
const size_t size,
std::vector<swss::FieldValueTuple>& values)
{
WARNINGS_NO_CAST_ALIGN;
auto pkvp_count = (const size_t*)buffer;
WARNINGS_RESET;
size_t kvp_count = *pkvp_count;
auto tmp_buffer = buffer + sizeof(size_t);
while (kvp_count > 0)
{
kvp_count--;
// read key and value from buffer
WARNINGS_NO_CAST_ALIGN;
auto pkeylen = (const size_t*)tmp_buffer;
WARNINGS_RESET;
tmp_buffer += sizeof(size_t);
if ((size_t)(tmp_buffer - buffer + *pkeylen) > size)
{
SWSS_LOG_THROW("serialized key data was truncated, key length: %zu, increase buffer size: %zu",
*pkeylen,
size);
}
auto pkey = string(tmp_buffer, *pkeylen);
tmp_buffer += *pkeylen;
WARNINGS_NO_CAST_ALIGN;
auto pvallen = (const size_t*)tmp_buffer;
WARNINGS_RESET;
tmp_buffer += sizeof(size_t);
if ((size_t)(tmp_buffer - buffer + *pvallen) > size)
{
SWSS_LOG_THROW("serialized value data was truncated,, value length: %zu increase buffer size: %zu",
*pvallen,
size);
}
auto pval = string(tmp_buffer, *pvallen);
tmp_buffer += *pvallen;
values.push_back(std::make_pair(pkey, pval));
}
}
static void deserializeBuffer(
const char* buffer,
const size_t size,
std::string& dbName,
std::string& tableName,
std::vector<std::shared_ptr<KeyOpFieldsValuesTuple>>& kcos)
{
std::vector<FieldValueTuple> values;
deserializeBuffer(buffer, size, values);
int fvs_size = -1;
KeyOpFieldsValuesTuple kco;
auto& key = kfvKey(kco);
auto& op = kfvOp(kco);
auto& fvs = kfvFieldsValues(kco);
for (auto& fv : values)
{
auto& field = fvField(fv);
auto& value = fvValue(fv);
// The first pair is the DB name and the table name.
if (fvs_size < 0)
{
dbName = field;
tableName = value;
fvs_size = 0;
continue;
}
// This is the beginning of a request.
// The first pair is the key and the number of attributes.
// If the attribute count is zero, it is a DEL request.
if (fvs_size == 0)
{
key = field;
fvs_size = std::stoi(value);
op = (fvs_size == 0) ? DEL_COMMAND : SET_COMMAND;
fvs.clear();
}
// This is an attribut pair.
else
{
fvs.push_back(fv);
--fvs_size;
}
// We got the last attribut pair. This is the end of a request.
if (fvs_size == 0)
{
kcos.push_back(std::make_shared<KeyOpFieldsValuesTuple>(kco));
}
}
}
private:
const char* m_buffer;
const size_t m_buffer_size;
char* m_current_position;
size_t m_kvp_count;
BinarySerializer(const char* buffer, const size_t size)
: m_buffer(buffer), m_buffer_size(size)
{
resetSerializer();
}
void resetSerializer()
{
m_current_position = const_cast<char*>(m_buffer) + sizeof(size_t);
m_kvp_count = 0;
}
void setKeyAndValue(const char* key, size_t klen,
const char* value, size_t vlen)
{
setData(key, klen);
setData(value, vlen);
m_kvp_count++;
}
size_t finalize()
{
// set key value pair count to message
WARNINGS_NO_CAST_ALIGN;
size_t* pkvp_count = (size_t*)const_cast<char*>(m_buffer);
WARNINGS_RESET;
*pkvp_count = m_kvp_count;
// return size
return m_current_position - m_buffer;
}
void setData(const char* data, size_t datalen)
{
if ((size_t)(m_current_position - m_buffer + datalen + sizeof(size_t)) > m_buffer_size)
{
SWSS_LOG_THROW("There are not enough buffer for binary serializer to serialize,\
key count: %zu, data length %zu, buffer size: %zu",
m_kvp_count,
datalen,
m_buffer_size);
}
WARNINGS_NO_CAST_ALIGN;
size_t* pdatalen = (size_t*)m_current_position;
WARNINGS_RESET;
*pdatalen = datalen;
m_current_position += sizeof(size_t);
memcpy(m_current_position, data, datalen);
m_current_position += datalen;
}
};
}
#endif