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/**
* Copyright © 2020 IBM Corporation
*
* 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.
*/
#include "user_data_json.hpp"
#include "json_utils.hpp"
#include "pel_types.hpp"
#include "pel_values.hpp"
#include "stream.hpp"
#include "user_data_formats.hpp"
#include <Python.h>
#include <fifo_map.hpp>
#include <iomanip>
#include <nlohmann/json.hpp>
#include <phosphor-logging/log.hpp>
#include <sstream>
namespace openpower::pels::user_data
{
namespace pv = openpower::pels::pel_values;
using namespace phosphor::logging;
// Use fifo_map as nlohmann::json's map. We are just ignoring the 'less'
// compare. With this map the keys are kept in FIFO order.
template <class K, class V, class dummy_compare, class A>
using fifoMap = nlohmann::fifo_map<K, V, nlohmann::fifo_map_compare<K>, A>;
using fifoJSON = nlohmann::basic_json<fifoMap>;
void pyDecRef(PyObject* pyObj)
{
Py_XDECREF(pyObj);
}
/**
* @brief Returns a JSON string for use by PEL::printSectionInJSON().
*
* The returning string will contain a JSON object, but without
* the outer {}. If the input JSON isn't a JSON object (dict), then
* one will be created with the input added to a 'Data' key.
*
* @param[in] json - The JSON to convert to a string
*
* @return std::string - The JSON string
*/
std::string prettyJSON(uint16_t componentID, uint8_t subType, uint8_t version,
const fifoJSON& json)
{
fifoJSON output;
output[pv::sectionVer] = std::to_string(version);
output[pv::subSection] = std::to_string(subType);
output[pv::createdBy] = getNumberString("0x%04X", componentID);
if (!json.is_object())
{
output["Data"] = json;
}
else
{
for (const auto& [key, value] : json.items())
{
output[key] = value;
}
}
// Let nlohmann do the pretty printing.
std::stringstream stream;
stream << std::setw(4) << output;
auto jsonString = stream.str();
// Now it looks like:
// {
// "Section Version": ...
// ...
// }
// Since PEL::printSectionInJSON() will supply the outer { }s,
// remove the existing ones.
// Replace the { and the following newline, and the } and its
// preceeding newline.
jsonString.erase(0, 2);
auto pos = jsonString.find_last_of('}');
jsonString.erase(pos - 1);
return jsonString;
}
/**
* @brief Return a JSON string from the passed in CBOR data.
*
* @param[in] componentID - The comp ID from the UserData section header
* @param[in] subType - The subtype from the UserData section header
* @param[in] version - The version from the UserData section header
* @param[in] data - The CBOR data
*
* @return std::string - The JSON string
*/
std::string getCBORJSON(uint16_t componentID, uint8_t subType, uint8_t version,
const std::vector<uint8_t>& data)
{
// The CBOR parser needs the pad bytes added to 4 byte align
// removed. The number of bytes added to the pad is on the
// very end, so will remove both fields before parsing.
// If the data vector is too short, an exception will get
// thrown which will be handled up the call stack.
auto cborData = data;
uint32_t pad{};
Stream stream{cborData};
stream.offset(cborData.size() - 4);
stream >> pad;
if (cborData.size() > (pad + sizeof(pad)))
{
cborData.resize(data.size() - sizeof(pad) - pad);
}
fifoJSON json = nlohmann::json::from_cbor(cborData);
return prettyJSON(componentID, subType, version, json);
}
/**
* @brief Return a JSON string from the passed in text data.
*
* The function breaks up the input text into a vector of strings with
* newline as separator and converts that into JSON. It will convert any
* unprintable characters to periods.
*
* @param[in] componentID - The comp ID from the UserData section header
* @param[in] subType - The subtype from the UserData section header
* @param[in] version - The version from the UserData section header
* @param[in] data - The CBOR data
*
* @return std::string - The JSON string
*/
std::string getTextJSON(uint16_t componentID, uint8_t subType, uint8_t version,
const std::vector<uint8_t>& data)
{
std::vector<std::string> text;
size_t startPos = 0;
// Converts any unprintable characters to periods
auto validate = [](char& ch) {
if ((ch < ' ') || (ch > '~'))
{
ch = '.';
}
};
// Break up the data into an array of strings with newline as separator
for (size_t pos = 0; pos < data.size(); ++pos)
{
if (data[pos] == '\n')
{
std::string line{reinterpret_cast<const char*>(&data[startPos]),
pos - startPos};
std::for_each(line.begin(), line.end(), validate);
text.push_back(std::move(line));
startPos = pos + 1;
}
}
if (startPos < data.size())
{
std::string line{reinterpret_cast<const char*>(&data[startPos]),
data.size() - startPos};
std::for_each(line.begin(), line.end(), validate);
text.push_back(std::move(line));
}
fifoJSON json = text;
return prettyJSON(componentID, subType, version, json);
}
/**
* @brief Convert to an appropriate JSON string as the data is one of
* the formats that we natively support.
*
* @param[in] componentID - The comp ID from the UserData section header
* @param[in] subType - The subtype from the UserData section header
* @param[in] version - The version from the UserData section header
* @param[in] data - The data itself
*
* @return std::optional<std::string> - The JSON string if it could be created,
* else std::nullopt.
*/
std::optional<std::string>
getBuiltinFormatJSON(uint16_t componentID, uint8_t subType, uint8_t version,
const std::vector<uint8_t>& data)
{
switch (subType)
{
case static_cast<uint8_t>(UserDataFormat::json):
{
std::string jsonString{data.begin(), data.begin() + data.size()};
fifoJSON json = nlohmann::json::parse(jsonString);
return prettyJSON(componentID, subType, version, json);
}
case static_cast<uint8_t>(UserDataFormat::cbor):
{
return getCBORJSON(componentID, subType, version, data);
}
case static_cast<uint8_t>(UserDataFormat::text):
{
return getTextJSON(componentID, subType, version, data);
}
default:
break;
}
return std::nullopt;
}
/**
* @brief Call Python modules to parse the data into a JSON string
*
* The module to call is based on the Creator Subsystem ID and the Component
* ID under the namespace "udparsers". For example: "udparsers.xyyyy.xyyyy"
* where "x" is the Creator Subsystem ID and "yyyy" is the Component ID.
*
* All modules must provide the following:
* Function: parseUDToJson
* Argument list:
* 1. (int) Sub-section type
* 2. (int) Section version
* 3. (memoryview): Data
*-Return data:
* 1. (str) JSON string
*
* @param[in] componentID - The comp ID from the UserData section header
* @param[in] subType - The subtype from the UserData section header
* @param[in] version - The version from the UserData section header
* @param[in] data - The data itself
* @param[in] creatorID - The creatorID from the PrivateHeader section
* @return std::optional<std::string> - The JSON string if it could be created,
* else std::nullopt
*/
std::optional<std::string> getPythonJSON(uint16_t componentID, uint8_t subType,
uint8_t version,
const std::vector<uint8_t>& data,
uint8_t creatorID)
{
PyObject *pName, *pModule, *pDict, *pFunc, *pArgs, *pData, *pResult,
*pBytes, *eType, *eValue, *eTraceback;
std::string pErrStr;
std::string module = getNumberString("%c", tolower(creatorID)) +
getNumberString("%04x", componentID);
pName = PyUnicode_FromString(
std::string("udparsers." + module + "." + module).c_str());
std::unique_ptr<PyObject, decltype(&pyDecRef)> modNamePtr(pName, &pyDecRef);
pModule = PyImport_Import(pName);
std::unique_ptr<PyObject, decltype(&pyDecRef)> modPtr(pModule, &pyDecRef);
if (pModule == NULL)
{
pErrStr = "No error string found";
PyErr_Fetch(&eType, &eValue, &eTraceback);
if (eValue)
{
PyObject* pStr = PyObject_Str(eValue);
if (pStr)
{
pErrStr = PyUnicode_AsUTF8(pStr);
}
Py_XDECREF(pStr);
}
}
else
{
pDict = PyModule_GetDict(pModule);
pFunc = PyDict_GetItemString(pDict, "parseUDToJson");
if (PyCallable_Check(pFunc))
{
auto ud = data.data();
pArgs = PyTuple_New(3);
std::unique_ptr<PyObject, decltype(&pyDecRef)> argPtr(pArgs,
&pyDecRef);
PyTuple_SetItem(pArgs, 0,
PyLong_FromUnsignedLong((unsigned long)subType));
PyTuple_SetItem(pArgs, 1,
PyLong_FromUnsignedLong((unsigned long)version));
pData = PyMemoryView_FromMemory(
reinterpret_cast<char*>(const_cast<unsigned char*>(ud)),
data.size(), PyBUF_READ);
std::unique_ptr<PyObject, decltype(&pyDecRef)> dataPtr(pData,
&pyDecRef);
PyTuple_SetItem(pArgs, 2, pData);
pResult = PyObject_CallObject(pFunc, pArgs);
std::unique_ptr<PyObject, decltype(&pyDecRef)> resPtr(pResult,
&pyDecRef);
if (pResult)
{
pBytes = PyUnicode_AsEncodedString(pResult, "utf-8", "~E~");
std::unique_ptr<PyObject, decltype(&pyDecRef)> pyBytePtr(
pBytes, &pyDecRef);
const char* output = PyBytes_AS_STRING(pBytes);
try
{
fifoJSON json = nlohmann::json::parse(output);
return prettyJSON(componentID, subType, version, json);
}
catch (std::exception& e)
{
log<level::ERR>("Bad JSON from parser",
entry("ERROR=%s", e.what()),
entry("PARSER_MODULE=%s", module.c_str()),
entry("SUBTYPE=0x%X", subType),
entry("VERSION=%d", version),
entry("DATA_LENGTH=%lu\n", data.size()));
return std::nullopt;
}
}
else
{
pErrStr = "No error string found";
PyErr_Fetch(&eType, &eValue, &eTraceback);
if (eValue)
{
PyObject* pStr = PyObject_Str(eValue);
if (pStr)
{
pErrStr = PyUnicode_AsUTF8(pStr);
}
Py_XDECREF(pStr);
}
}
}
}
if (!pErrStr.empty())
{
log<level::ERR>("Python exception thrown by parser",
entry("ERROR=%s", pErrStr.c_str()),
entry("PARSER_MODULE=%s", module.c_str()),
entry("SUBTYPE=0x%X", subType),
entry("VERSION=%d", version),
entry("DATA_LENGTH=%lu\n", data.size()));
}
Py_XDECREF(eType);
Py_XDECREF(eValue);
Py_XDECREF(eTraceback);
return std::nullopt;
}
std::optional<std::string> getJSON(uint16_t componentID, uint8_t subType,
uint8_t version,
const std::vector<uint8_t>& data,
uint8_t creatorID,
const std::vector<std::string>& plugins)
{
std::string subsystem = getNumberString("%c", tolower(creatorID));
std::string component = getNumberString("%04x", componentID);
try
{
if (pv::creatorIDs.at(getNumberString("%c", creatorID)) == "BMC" &&
componentID == static_cast<uint16_t>(ComponentID::phosphorLogging))
{
return getBuiltinFormatJSON(componentID, subType, version, data);
}
else if (std::find(plugins.begin(), plugins.end(),
subsystem + component) != plugins.end())
{
return getPythonJSON(componentID, subType, version, data,
creatorID);
}
}
catch (std::exception& e)
{
log<level::ERR>("Failed parsing UserData", entry("ERROR=%s", e.what()),
entry("COMP_ID=0x%X", componentID),
entry("SUBTYPE=0x%X", subType),
entry("VERSION=%d", version),
entry("DATA_LENGTH=%lu\n", data.size()));
}
return std::nullopt;
}
} // namespace openpower::pels::user_data