extensions/openpower-pels/registry.cpp - openbmc/phosphor-logging - Gitiles

 /**
  * Copyright © 2019 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 "registry.hpp"

 #include "pel_types.hpp"
 #include "pel_values.hpp"

 #include <fstream>
 #include <phosphor-logging/log.hpp>

 namespace openpower
 {
 namespace pels
 {
 namespace message
 {

 namespace pv = pel_values;
 namespace fs = std::filesystem;
 using namespace phosphor::logging;

 constexpr auto debugFilePath = "/etc/phosphor-logging/";

 namespace helper
 {

 uint8_t getSubsystem(const std::string& subsystemName)
 {
     // Get the actual value to use in the PEL for the string name
     auto ss = pv::findByName(subsystemName, pv::subsystemValues);
     if (ss == pv::subsystemValues.end())
     {
         // Schema validation should be catching this.
         log<level::ERR>("Invalid subsystem name used in message registry",
                         entry("SUBSYSTEM=%s", subsystemName.c_str()));

         throw std::runtime_error("Invalid subsystem used in message registry");
     }

     return std::get<pv::fieldValuePos>(*ss);
 }

 uint8_t getSeverity(const std::string& severityName)
 {
     auto s = pv::findByName(severityName, pv::severityValues);
     if (s == pv::severityValues.end())
     {
         // Schema validation should be catching this.
         log<level::ERR>("Invalid severity name used in message registry",
                         entry("SEVERITY=%s", severityName.c_str()));

         throw std::runtime_error("Invalid severity used in message registry");
     }

     return std::get<pv::fieldValuePos>(*s);
 }

 std::vector<RegistrySeverity> getSeverities(const nlohmann::json& severity)
 {
     std::vector<RegistrySeverity> severities;

     // The plain string value, like "unrecoverable"
     if (severity.is_string())
     {
         RegistrySeverity s;
         s.severity = getSeverity(severity.get<std::string>());
         severities.push_back(std::move(s));
     }
     else
     {
         // An array, with an element like:
         // {
         //    "SevValue": "unrecoverable",
         //    "System", "systemA"
         // }
         for (const auto& sev : severity)
         {
             RegistrySeverity s;
             s.severity = getSeverity(sev["SevValue"].get<std::string>());

             if (sev.contains("System"))
             {
                 s.system = sev["System"].get<std::string>();
             }

             severities.push_back(std::move(s));
         }
     }

     return severities;
 }

 uint16_t getActionFlags(const std::vector<std::string>& flags)
 {
     uint16_t actionFlags = 0;

     // Make the bitmask based on the array of flag names
     for (const auto& flag : flags)
     {
         auto s = pv::findByName(flag, pv::actionFlagsValues);
         if (s == pv::actionFlagsValues.end())
         {
             // Schema validation should be catching this.
             log<level::ERR>("Invalid action flag name used in message registry",
                             entry("FLAG=%s", flag.c_str()));

             throw std::runtime_error(
                 "Invalid action flag used in message registry");
         }

         actionFlags |= std::get<pv::fieldValuePos>(*s);
     }

     return actionFlags;
 }

 uint8_t getEventType(const std::string& eventTypeName)
 {
     auto t = pv::findByName(eventTypeName, pv::eventTypeValues);
     if (t == pv::eventTypeValues.end())
     {
         log<level::ERR>("Invalid event type used in message registry",
                         entry("EVENT_TYPE=%s", eventTypeName.c_str()));

         throw std::runtime_error("Invalid event type used in message registry");
     }
     return std::get<pv::fieldValuePos>(*t);
 }

 uint8_t getEventScope(const std::string& eventScopeName)
 {
     auto s = pv::findByName(eventScopeName, pv::eventScopeValues);
     if (s == pv::eventScopeValues.end())
     {
         log<level::ERR>("Invalid event scope used in registry",
                         entry("EVENT_SCOPE=%s", eventScopeName.c_str()));

         throw std::runtime_error(
             "Invalid event scope used in message registry");
     }
     return std::get<pv::fieldValuePos>(*s);
 }

 uint16_t getSRCReasonCode(const nlohmann::json& src, const std::string& name)
 {
     std::string rc = src["ReasonCode"];
     uint16_t reasonCode = strtoul(rc.c_str(), nullptr, 16);
     if (reasonCode == 0)
     {
         log<phosphor::logging::level::ERR>(
             "Invalid reason code in message registry",
             entry("ERROR_NAME=%s", name.c_str()),
             entry("REASON_CODE=%s", rc.c_str()));

         throw std::runtime_error("Invalid reason code in message registry");
     }
     return reasonCode;
 }

 uint8_t getSRCType(const nlohmann::json& src, const std::string& name)
 {
     // Looks like: "22"
     std::string srcType = src["Type"];
     size_t type = strtoul(srcType.c_str(), nullptr, 16);
     if ((type == 0) || (srcType.size() != 2)) // 1 hex byte
     {
         log<phosphor::logging::level::ERR>(
             "Invalid SRC Type in message registry",
             entry("ERROR_NAME=%s", name.c_str()),
             entry("SRC_TYPE=%s", srcType.c_str()));

         throw std::runtime_error("Invalid SRC Type in message registry");
     }

     return type;
 }

 std::optional<std::map<SRC::WordNum, SRC::AdditionalDataField>>
     getSRCHexwordFields(const nlohmann::json& src, const std::string& name)
 {
     std::map<SRC::WordNum, SRC::AdditionalDataField> hexwordFields;

     // Build the map of which AdditionalData fields to use for which SRC words

     // Like:
     // {
     //   "8":
     //   {
     //     "AdditionalDataPropSource": "TEST"
     //   }
     //
     // }

     for (const auto& word : src["Words6To9"].items())
     {
         std::string num = word.key();
         size_t wordNum = std::strtoul(num.c_str(), nullptr, 10);

         if (wordNum == 0)
         {
             log<phosphor::logging::level::ERR>(
                 "Invalid SRC word number in message registry",
                 entry("ERROR_NAME=%s", name.c_str()),
                 entry("SRC_WORD_NUM=%s", num.c_str()));

             throw std::runtime_error("Invalid SRC word in message registry");
         }

         auto attributes = word.value();
         std::string adPropName = attributes["AdditionalDataPropSource"];
         hexwordFields[wordNum] = std::move(adPropName);
     }

     if (!hexwordFields.empty())
     {
         return hexwordFields;
     }

     return std::nullopt;
 }
 std::optional<std::vector<SRC::WordNum>>
     getSRCSymptomIDFields(const nlohmann::json& src, const std::string& name)
 {
     std::vector<SRC::WordNum> symptomIDFields;

     // Looks like:
     // "SymptomIDFields": ["SRCWord3", "SRCWord6"],

     for (const std::string& field : src["SymptomIDFields"])
     {
         // Just need the last digit off the end, e.g. SRCWord6.
         // The schema enforces the format of these.
         auto srcWordNum = field.substr(field.size() - 1);
         size_t num = std::strtoul(srcWordNum.c_str(), nullptr, 10);
         if (num == 0)
         {
             log<phosphor::logging::level::ERR>(
                 "Invalid symptom ID field in message registry",
                 entry("ERROR_NAME=%s", name.c_str()),
                 entry("FIELD_NAME=%s", srcWordNum.c_str()));

             throw std::runtime_error("Invalid symptom ID in message registry");
         }
         symptomIDFields.push_back(num);
     }
     if (!symptomIDFields.empty())
     {
         return symptomIDFields;
     }

     return std::nullopt;
 }

 uint16_t getComponentID(uint8_t srcType, uint16_t reasonCode,
                         const nlohmann::json& pelEntry, const std::string& name)
 {
     uint16_t id = 0;

     // If the ComponentID field is there, use that.  Otherwise, if it's a
     // 0xBD BMC error SRC, use the reasoncode.
     if (pelEntry.contains("ComponentID"))
     {
         std::string componentID = pelEntry["ComponentID"];
         id = strtoul(componentID.c_str(), nullptr, 16);
     }
     else
     {
         // On BMC error SRCs (BD), can just get the component ID from
         // the first byte of the reason code.
         if (srcType == static_cast<uint8_t>(SRCType::bmcError))
         {
             id = reasonCode & 0xFF00;
         }
         else
         {
             log<level::ERR>("Missing component ID field in message registry",
                             entry("ERROR_NAME=%s", name.c_str()));

             throw std::runtime_error(
                 "Missing component ID field in message registry");
         }
     }

     return id;
 }

 /**
  * @brief Says if the JSON is the format that contains AdditionalData keys
  *        as in index into them.
  *
  * @param[in] json - The highest level callout JSON
  *
  * @return bool - If it is the AdditionalData format or not
  */
 bool calloutUsesAdditionalData(const nlohmann::json& json)
 {
     return (json.contains("ADName") &&
             json.contains("CalloutsWithTheirADValues"));
 }

 /**
  * @brief Finds the callouts to use when there is no AdditionalData,
  *        but the system type may be used as a key.
  *
  * One entry in the array looks like the following.  The System key
  * is optional and if not present it means that entry applies to
  * every configuration that doesn't have another entry with a matching
  * System key.
  *
  *    {
  *        "System": "system1",
  *        "CalloutList":
  *        [
  *            {
  *                "Priority": "high",
  *                "LocCode": "P1-C1"
  *            },
  *            {
  *                "Priority": "low",
  *                "LocCode": "P1"
  *            }
  *        ]
  *    }
  */
 const nlohmann::json& findCalloutList(const nlohmann::json& json,
                                       const std::string& systemType)
 {
     const nlohmann::json* callouts = nullptr;

     if (!json.is_array())
     {
         throw std::runtime_error{"findCalloutList was not passed a JSON array"};
     }

     // The entry with the system type match will take precedence over the entry
     // without any "System" field in it at all, which will match all other
     // cases.
     for (const auto& calloutList : json)
     {
         if (calloutList.contains("System"))
         {
             if (systemType == calloutList["System"].get<std::string>())
             {
                 callouts = &calloutList["CalloutList"];
                 break;
             }
         }
         else
         {
             // Any entry with no System key
             callouts = &calloutList["CalloutList"];
         }
     }

     if (!callouts)
     {
         log<level::WARNING>(
             "No matching system type entry or default system type entry "
             " for PEL callout list",
             entry("SYSTEMTYPE=%s", systemType.c_str()));

         throw std::runtime_error{
             "Could not find a CalloutList JSON for this error and system type"};
     }

     return *callouts;
 }

 /**
  * @brief Creates a RegistryCallout based on the input JSON.
  *
  * The JSON looks like:
  *     {
  *          "Priority": "high",
  *          "LocCode": "E1"
  *          ...
  *     }
  *
  * Schema validation enforces what keys are present.
  *
  * @param[in] json - The JSON dictionary entry for a callout
  *
  * @return RegistryCallout - A filled in RegistryCallout
  */
 RegistryCallout makeRegistryCallout(const nlohmann::json& json)
 {
     RegistryCallout callout;

     callout.priority = "high";

     if (json.contains("Priority"))
     {
         callout.priority = json["Priority"].get<std::string>();
     }

     if (json.contains("LocCode"))
     {
         callout.locCode = json["LocCode"].get<std::string>();
     }

     if (json.contains("Procedure"))
     {
         callout.procedure = json["Procedure"].get<std::string>();
     }
     else if (json.contains("SymbolicFRU"))
     {
         callout.symbolicFRU = json["SymbolicFRU"].get<std::string>();
     }
     else if (json.contains("SymbolicFRUTrusted"))
     {
         callout.symbolicFRUTrusted =
             json["SymbolicFRUTrusted"].get<std::string>();
     }

     return callout;
 }

 /**
  * @brief Returns the callouts to use when an AdditionalData key is
  *        required to find the correct entries.
  *
  *       The System property is used to find which CalloutList to use.
  *       If System is missing, then that CalloutList is valid for
  *       everything.
  *
  * The JSON looks like:
  *    [
  *        {
  *            "System": "systemA",
  *            "CalloutList":
  *            [
  *                {
  *                    "Priority": "high",
  *                    "LocCode": "P1-C5"
  *                }
  *            ]
  *         }
  *    ]
  *
  * @param[in] json - The callout JSON
  * @param[in] systemType - The system type from EntityManager
  *
  * @return std::vector<RegistryCallout> - The callouts to use
  */
 std::vector<RegistryCallout> getCalloutsWithoutAD(const nlohmann::json& json,
                                                   const std::string& systemType)
 {
     std::vector<RegistryCallout> calloutEntries;

     // Find the CalloutList to use based on the system type
     const auto& calloutList = findCalloutList(json, systemType);

     // We finally found the callouts, make the objects.
     for (const auto& callout : calloutList)
     {
         calloutEntries.push_back(std::move(makeRegistryCallout(callout)));
     }

     return calloutEntries;
 }

 /**
  * @brief Returns the callouts to use when an AdditionalData key is
  *        required to find the correct entries.
  *
  * The JSON looks like:
  *    {
  *        "ADName": "PROC_NUM",
  *        "CalloutsWithTheirADValues":
  *        [
  *            {
  *                "ADValue": "0",
  *                "Callouts":
  *                [
  *                    {
  *                        "CalloutList":
  *                        [
  *                            {
  *                                "Priority": "high",
  *                                "LocCode": "P1-C5"
  *                            }
  *                        ]
  *                    }
  *                ]
  *            }
  *        ]
  *     }
  *
  * Note that the "Callouts" entry above is the same as the top level
  * entry used when there is no AdditionalData key.
  *
  * @param[in] json - The callout JSON
  * @param[in] systemType - The system type from EntityManager
  * @param[in] additionalData - The AdditionalData property
  *
  * @return std::vector<RegistryCallout> - The callouts to use
  */
 std::vector<RegistryCallout>
     getCalloutsUsingAD(const nlohmann::json& json,
                        const std::string& systemType,
                        const AdditionalData& additionalData)
 {
     // This indicates which AD field we'll be using
     auto keyName = json["ADName"].get<std::string>();

     // Get the actual value from the AD data
     auto adValue = additionalData.getValue(keyName);

     if (!adValue)
     {
         // The AdditionalData did not contain the necessary key
         log<level::WARNING>(
             "The PEL message registry callouts JSON "
             "said to use an AdditionalData key that isn't in the "
             "AdditionalData event log property",
             entry("ADNAME=%s\n", keyName.c_str()));
         throw std::runtime_error{
             "Missing AdditionalData entry for this callout"};
     }

     const auto& callouts = json["CalloutsWithTheirADValues"];

     // find the entry with that AD value
     auto it = std::find_if(
         callouts.begin(), callouts.end(), [adValue](const nlohmann::json& j) {
             return *adValue == j["ADValue"].get<std::string>();
         });

     if (it == callouts.end())
     {
         log<level::WARNING>(
             "No callout entry found for the AdditionalData value used",
             entry("AD_VALUE=%s", adValue->c_str()));

         throw std::runtime_error{
             "No callout entry found for the AdditionalData value used"};
     }

     // Proceed to find the callouts possibly based on system type.
     return getCalloutsWithoutAD((*it)["Callouts"], systemType);
 }

 } // namespace helper

 std::optional<Entry> Registry::lookup(const std::string& name, LookupType type,
                                       bool toCache)
 {
     std::optional<nlohmann::json> registryTmp;
     auto& registryOpt = (_registry) ? _registry : registryTmp;
     if (!registryOpt)
     {
         registryOpt = readRegistry(_registryFile);
         if (!registryOpt)
         {
             return std::nullopt;
         }
         else if (toCache)
         {
             // Save message registry in memory for peltool
             _registry = std::move(registryTmp);
         }
     }
     auto& reg = (_registry) ? _registry : registryTmp;
     const auto& registry = reg.value();
     // Find an entry with this name in the PEL array.
     auto e = std::find_if(
         registry["PELs"].begin(), registry["PELs"].end(),
         [&name, &type](const auto& j) {
             return ((name == j["Name"] && type == LookupType::name) ||
                     (name == j["SRC"]["ReasonCode"] &&
                      type == LookupType::reasonCode));
         });

     if (e != registry["PELs"].end())
     {
         // Fill in the Entry structure from the JSON.  Most, but not all, fields
         // are optional.

         try
         {
             Entry entry;
             entry.name = (*e)["Name"];
             entry.subsystem = helper::getSubsystem((*e)["Subsystem"]);

             if (e->contains("ActionFlags"))
             {
                 entry.actionFlags = helper::getActionFlags((*e)["ActionFlags"]);
             }

             if (e->contains("MfgActionFlags"))
             {
                 entry.mfgActionFlags =
                     helper::getActionFlags((*e)["MfgActionFlags"]);
             }

             if (e->contains("Severity"))
             {
                 entry.severity = helper::getSeverities((*e)["Severity"]);
             }

             if (e->contains("MfgSeverity"))
             {
                 entry.mfgSeverity = helper::getSeverities((*e)["MfgSeverity"]);
             }

             if (e->contains("EventType"))
             {
                 entry.eventType = helper::getEventType((*e)["EventType"]);
             }

             if (e->contains("EventScope"))
             {
                 entry.eventScope = helper::getEventScope((*e)["EventScope"]);
             }

             auto& src = (*e)["SRC"];
             entry.src.reasonCode = helper::getSRCReasonCode(src, name);

             if (src.contains("Type"))
             {
                 entry.src.type = helper::getSRCType(src, name);
             }
             else
             {
                 entry.src.type = static_cast<uint8_t>(SRCType::bmcError);
             }

             // Now that we know the SRC type and reason code,
             // we can get the component ID.
             entry.componentID = helper::getComponentID(
                 entry.src.type, entry.src.reasonCode, *e, name);

             if (src.contains("Words6To9"))
             {
                 entry.src.hexwordADFields =
                     helper::getSRCHexwordFields(src, name);
             }

             if (src.contains("SymptomIDFields"))
             {
                 entry.src.symptomID = helper::getSRCSymptomIDFields(src, name);
             }

             if (src.contains("PowerFault"))
             {
                 entry.src.powerFault = src["PowerFault"];
             }

             auto& doc = (*e)["Documentation"];
             entry.doc.message = doc["Message"];
             entry.doc.description = doc["Description"];
             if (doc.contains("MessageArgSources"))
             {
                 entry.doc.messageArgSources = doc["MessageArgSources"];
             }

             // If there are callouts defined, save the JSON for later
             if (_loadCallouts)
             {
                 if (e->contains("Callouts"))
                 {
                     entry.callouts = (*e)["Callouts"];
                 }
                 else if (e->contains("CalloutsUsingAD"))
                 {
                     entry.callouts = (*e)["CalloutsUsingAD"];
                 }
             }

             return entry;
         }
         catch (std::exception& e)
         {
             log<level::ERR>("Found invalid message registry field",
                             entry("ERROR=%s", e.what()));
         }
     }

     return std::nullopt;
 }

 std::optional<nlohmann::json>
     Registry::readRegistry(const std::filesystem::path& registryFile)
 {
     // Look in /etc first in case someone put a test file there
     fs::path debugFile{fs::path{debugFilePath} / registryFileName};
     nlohmann::json registry;
     std::ifstream file;

     if (fs::exists(debugFile))
     {
         log<level::INFO>("Using debug PEL message registry");
         file.open(debugFile);
     }
     else
     {
         file.open(registryFile);
     }

     try
     {
         registry = nlohmann::json::parse(file);
     }
     catch (std::exception& e)
     {
         log<level::ERR>("Error parsing message registry JSON",
                         entry("JSON_ERROR=%s", e.what()));
         return std::nullopt;
     }
     return registry;
 }

 std::vector<RegistryCallout>
     Registry::getCallouts(const nlohmann::json& calloutJSON,
                           const std::string& systemType,
                           const AdditionalData& additionalData)
 {
     // The JSON may either use an AdditionalData key
     // as an index, or not.
     if (helper::calloutUsesAdditionalData(calloutJSON))
     {
         return helper::getCalloutsUsingAD(calloutJSON, systemType,
                                           additionalData);
     }

     return helper::getCalloutsWithoutAD(calloutJSON, systemType);
 }

 } // namespace message
 } // namespace pels
 } // namespace openpower
	/**
	* Copyright © 2019 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 "registry.hpp"

	#include "pel_types.hpp"
	#include "pel_values.hpp"

	#include <fstream>
	#include <phosphor-logging/log.hpp>

	namespace openpower
	{
	namespace pels
	{
	namespace message
	{

	namespace pv = pel_values;
	namespace fs = std::filesystem;
	using namespace phosphor::logging;

	constexpr auto debugFilePath = "/etc/phosphor-logging/";

	namespace helper
	{

	uint8_t getSubsystem(const std::string& subsystemName)
	{
	// Get the actual value to use in the PEL for the string name
	auto ss = pv::findByName(subsystemName, pv::subsystemValues);
	if (ss == pv::subsystemValues.end())
	{
	// Schema validation should be catching this.
	log<level::ERR>("Invalid subsystem name used in message registry",
	entry("SUBSYSTEM=%s", subsystemName.c_str()));

	throw std::runtime_error("Invalid subsystem used in message registry");
	}

	return std::get<pv::fieldValuePos>(*ss);
	}

	uint8_t getSeverity(const std::string& severityName)
	{
	auto s = pv::findByName(severityName, pv::severityValues);
	if (s == pv::severityValues.end())
	{
	// Schema validation should be catching this.
	log<level::ERR>("Invalid severity name used in message registry",
	entry("SEVERITY=%s", severityName.c_str()));

	throw std::runtime_error("Invalid severity used in message registry");
	}

	return std::get<pv::fieldValuePos>(*s);
	}

	std::vector<RegistrySeverity> getSeverities(const nlohmann::json& severity)
	{
	std::vector<RegistrySeverity> severities;

	// The plain string value, like "unrecoverable"
	if (severity.is_string())
	{
	RegistrySeverity s;
	s.severity = getSeverity(severity.get<std::string>());
	severities.push_back(std::move(s));
	}
	else
	{
	// An array, with an element like:
	// {
	// "SevValue": "unrecoverable",
	// "System", "systemA"
	// }
	for (const auto& sev : severity)
	{
	RegistrySeverity s;
	s.severity = getSeverity(sev["SevValue"].get<std::string>());

	if (sev.contains("System"))
	{
	s.system = sev["System"].get<std::string>();
	}

	severities.push_back(std::move(s));
	}
	}

	return severities;
	}

	uint16_t getActionFlags(const std::vector<std::string>& flags)
	{
	uint16_t actionFlags = 0;

	// Make the bitmask based on the array of flag names
	for (const auto& flag : flags)
	{
	auto s = pv::findByName(flag, pv::actionFlagsValues);
	if (s == pv::actionFlagsValues.end())
	{
	// Schema validation should be catching this.
	log<level::ERR>("Invalid action flag name used in message registry",
	entry("FLAG=%s", flag.c_str()));

	throw std::runtime_error(
	"Invalid action flag used in message registry");
	}

	actionFlags \|= std::get<pv::fieldValuePos>(*s);
	}

	return actionFlags;
	}

	uint8_t getEventType(const std::string& eventTypeName)
	{
	auto t = pv::findByName(eventTypeName, pv::eventTypeValues);
	if (t == pv::eventTypeValues.end())
	{
	log<level::ERR>("Invalid event type used in message registry",
	entry("EVENT_TYPE=%s", eventTypeName.c_str()));

	throw std::runtime_error("Invalid event type used in message registry");
	}
	return std::get<pv::fieldValuePos>(*t);
	}

	uint8_t getEventScope(const std::string& eventScopeName)
	{
	auto s = pv::findByName(eventScopeName, pv::eventScopeValues);
	if (s == pv::eventScopeValues.end())
	{
	log<level::ERR>("Invalid event scope used in registry",
	entry("EVENT_SCOPE=%s", eventScopeName.c_str()));

	throw std::runtime_error(
	"Invalid event scope used in message registry");
	}
	return std::get<pv::fieldValuePos>(*s);
	}

	uint16_t getSRCReasonCode(const nlohmann::json& src, const std::string& name)
	{
	std::string rc = src["ReasonCode"];
	uint16_t reasonCode = strtoul(rc.c_str(), nullptr, 16);
	if (reasonCode == 0)
	{
	log<phosphor::logging::level::ERR>(
	"Invalid reason code in message registry",
	entry("ERROR_NAME=%s", name.c_str()),
	entry("REASON_CODE=%s", rc.c_str()));

	throw std::runtime_error("Invalid reason code in message registry");
	}
	return reasonCode;
	}

	uint8_t getSRCType(const nlohmann::json& src, const std::string& name)
	{
	// Looks like: "22"
	std::string srcType = src["Type"];
	size_t type = strtoul(srcType.c_str(), nullptr, 16);
	if ((type == 0) \|\| (srcType.size() != 2)) // 1 hex byte
	{
	log<phosphor::logging::level::ERR>(
	"Invalid SRC Type in message registry",
	entry("ERROR_NAME=%s", name.c_str()),
	entry("SRC_TYPE=%s", srcType.c_str()));

	throw std::runtime_error("Invalid SRC Type in message registry");
	}

	return type;
	}

	std::optional<std::map<SRC::WordNum, SRC::AdditionalDataField>>
	getSRCHexwordFields(const nlohmann::json& src, const std::string& name)
	{
	std::map<SRC::WordNum, SRC::AdditionalDataField> hexwordFields;

	// Build the map of which AdditionalData fields to use for which SRC words

	// Like:
	// {
	// "8":
	// {
	// "AdditionalDataPropSource": "TEST"
	// }
	//
	// }

	for (const auto& word : src["Words6To9"].items())
	{
	std::string num = word.key();
	size_t wordNum = std::strtoul(num.c_str(), nullptr, 10);

	if (wordNum == 0)
	{
	log<phosphor::logging::level::ERR>(
	"Invalid SRC word number in message registry",
	entry("ERROR_NAME=%s", name.c_str()),
	entry("SRC_WORD_NUM=%s", num.c_str()));

	throw std::runtime_error("Invalid SRC word in message registry");
	}

	auto attributes = word.value();
	std::string adPropName = attributes["AdditionalDataPropSource"];
	hexwordFields[wordNum] = std::move(adPropName);
	}

	if (!hexwordFields.empty())
	{
	return hexwordFields;
	}

	return std::nullopt;
	}
	std::optional<std::vector<SRC::WordNum>>
	getSRCSymptomIDFields(const nlohmann::json& src, const std::string& name)
	{
	std::vector<SRC::WordNum> symptomIDFields;

	// Looks like:
	// "SymptomIDFields": ["SRCWord3", "SRCWord6"],

	for (const std::string& field : src["SymptomIDFields"])
	{
	// Just need the last digit off the end, e.g. SRCWord6.
	// The schema enforces the format of these.
	auto srcWordNum = field.substr(field.size() - 1);
	size_t num = std::strtoul(srcWordNum.c_str(), nullptr, 10);
	if (num == 0)
	{
	log<phosphor::logging::level::ERR>(
	"Invalid symptom ID field in message registry",
	entry("ERROR_NAME=%s", name.c_str()),
	entry("FIELD_NAME=%s", srcWordNum.c_str()));

	throw std::runtime_error("Invalid symptom ID in message registry");
	}
	symptomIDFields.push_back(num);
	}
	if (!symptomIDFields.empty())
	{
	return symptomIDFields;
	}

	return std::nullopt;
	}

	uint16_t getComponentID(uint8_t srcType, uint16_t reasonCode,
	const nlohmann::json& pelEntry, const std::string& name)
	{
	uint16_t id = 0;

	// If the ComponentID field is there, use that. Otherwise, if it's a
	// 0xBD BMC error SRC, use the reasoncode.
	if (pelEntry.contains("ComponentID"))
	{
	std::string componentID = pelEntry["ComponentID"];
	id = strtoul(componentID.c_str(), nullptr, 16);
	}
	else
	{
	// On BMC error SRCs (BD), can just get the component ID from
	// the first byte of the reason code.
	if (srcType == static_cast<uint8_t>(SRCType::bmcError))
	{
	id = reasonCode & 0xFF00;
	}
	else
	{
	log<level::ERR>("Missing component ID field in message registry",
	entry("ERROR_NAME=%s", name.c_str()));

	throw std::runtime_error(
	"Missing component ID field in message registry");
	}
	}

	return id;
	}

	/**
	* @brief Says if the JSON is the format that contains AdditionalData keys
	* as in index into them.
	*
	* @param[in] json - The highest level callout JSON
	*
	* @return bool - If it is the AdditionalData format or not
	*/
	bool calloutUsesAdditionalData(const nlohmann::json& json)
	{
	return (json.contains("ADName") &&
	json.contains("CalloutsWithTheirADValues"));
	}

	/**
	* @brief Finds the callouts to use when there is no AdditionalData,
	* but the system type may be used as a key.
	*
	* One entry in the array looks like the following. The System key
	* is optional and if not present it means that entry applies to
	* every configuration that doesn't have another entry with a matching
	* System key.
	*
	* {
	* "System": "system1",
	* "CalloutList":
	* [
	* {
	* "Priority": "high",
	* "LocCode": "P1-C1"
	* },
	* {
	* "Priority": "low",
	* "LocCode": "P1"
	* }
	* ]
	* }
	*/
	const nlohmann::json& findCalloutList(const nlohmann::json& json,
	const std::string& systemType)
	{
	const nlohmann::json* callouts = nullptr;

	if (!json.is_array())
	{
	throw std::runtime_error{"findCalloutList was not passed a JSON array"};
	}

	// The entry with the system type match will take precedence over the entry
	// without any "System" field in it at all, which will match all other
	// cases.
	for (const auto& calloutList : json)
	{
	if (calloutList.contains("System"))
	{
	if (systemType == calloutList["System"].get<std::string>())
	{
	callouts = &calloutList["CalloutList"];
	break;
	}
	}
	else
	{
	// Any entry with no System key
	callouts = &calloutList["CalloutList"];
	}
	}

	if (!callouts)
	{
	log<level::WARNING>(
	"No matching system type entry or default system type entry "
	" for PEL callout list",
	entry("SYSTEMTYPE=%s", systemType.c_str()));

	throw std::runtime_error{
	"Could not find a CalloutList JSON for this error and system type"};
	}

	return *callouts;
	}

	/**
	* @brief Creates a RegistryCallout based on the input JSON.
	*
	* The JSON looks like:
	* {
	* "Priority": "high",
	* "LocCode": "E1"
	* ...
	* }
	*
	* Schema validation enforces what keys are present.
	*
	* @param[in] json - The JSON dictionary entry for a callout
	*
	* @return RegistryCallout - A filled in RegistryCallout
	*/
	RegistryCallout makeRegistryCallout(const nlohmann::json& json)
	{
	RegistryCallout callout;

	callout.priority = "high";

	if (json.contains("Priority"))
	{
	callout.priority = json["Priority"].get<std::string>();
	}

	if (json.contains("LocCode"))
	{
	callout.locCode = json["LocCode"].get<std::string>();
	}

	if (json.contains("Procedure"))
	{
	callout.procedure = json["Procedure"].get<std::string>();
	}
	else if (json.contains("SymbolicFRU"))
	{
	callout.symbolicFRU = json["SymbolicFRU"].get<std::string>();
	}
	else if (json.contains("SymbolicFRUTrusted"))
	{
	callout.symbolicFRUTrusted =
	json["SymbolicFRUTrusted"].get<std::string>();
	}

	return callout;
	}

	/**
	* @brief Returns the callouts to use when an AdditionalData key is
	* required to find the correct entries.
	*
	* The System property is used to find which CalloutList to use.
	* If System is missing, then that CalloutList is valid for
	* everything.
	*
	* The JSON looks like:
	* [
	* {
	* "System": "systemA",
	* "CalloutList":
	* [
	* {
	* "Priority": "high",
	* "LocCode": "P1-C5"
	* }
	* ]
	* }
	* ]
	*
	* @param[in] json - The callout JSON
	* @param[in] systemType - The system type from EntityManager
	*
	* @return std::vector<RegistryCallout> - The callouts to use
	*/
	std::vector<RegistryCallout> getCalloutsWithoutAD(const nlohmann::json& json,
	const std::string& systemType)
	{
	std::vector<RegistryCallout> calloutEntries;

	// Find the CalloutList to use based on the system type
	const auto& calloutList = findCalloutList(json, systemType);

	// We finally found the callouts, make the objects.
	for (const auto& callout : calloutList)
	{
	calloutEntries.push_back(std::move(makeRegistryCallout(callout)));
	}

	return calloutEntries;
	}

	/**
	* @brief Returns the callouts to use when an AdditionalData key is
	* required to find the correct entries.
	*
	* The JSON looks like:
	* {
	* "ADName": "PROC_NUM",
	* "CalloutsWithTheirADValues":
	* [
	* {
	* "ADValue": "0",
	* "Callouts":
	* [
	* {
	* "CalloutList":
	* [
	* {
	* "Priority": "high",
	* "LocCode": "P1-C5"
	* }
	* ]
	* }
	* ]
	* }
	* ]
	* }
	*
	* Note that the "Callouts" entry above is the same as the top level
	* entry used when there is no AdditionalData key.
	*
	* @param[in] json - The callout JSON
	* @param[in] systemType - The system type from EntityManager
	* @param[in] additionalData - The AdditionalData property
	*
	* @return std::vector<RegistryCallout> - The callouts to use
	*/
	std::vector<RegistryCallout>
	getCalloutsUsingAD(const nlohmann::json& json,
	const std::string& systemType,
	const AdditionalData& additionalData)
	{
	// This indicates which AD field we'll be using
	auto keyName = json["ADName"].get<std::string>();

	// Get the actual value from the AD data
	auto adValue = additionalData.getValue(keyName);

	if (!adValue)
	{
	// The AdditionalData did not contain the necessary key
	log<level::WARNING>(
	"The PEL message registry callouts JSON "
	"said to use an AdditionalData key that isn't in the "
	"AdditionalData event log property",
	entry("ADNAME=%s\n", keyName.c_str()));
	throw std::runtime_error{
	"Missing AdditionalData entry for this callout"};
	}

	const auto& callouts = json["CalloutsWithTheirADValues"];

	// find the entry with that AD value
	auto it = std::find_if(
	callouts.begin(), callouts.end(), [adValue](const nlohmann::json& j) {
	return *adValue == j["ADValue"].get<std::string>();
	});

	if (it == callouts.end())
	{
	log<level::WARNING>(
	"No callout entry found for the AdditionalData value used",
	entry("AD_VALUE=%s", adValue->c_str()));

	throw std::runtime_error{
	"No callout entry found for the AdditionalData value used"};
	}

	// Proceed to find the callouts possibly based on system type.
	return getCalloutsWithoutAD((*it)["Callouts"], systemType);
	}

	} // namespace helper

	std::optional<Entry> Registry::lookup(const std::string& name, LookupType type,
	bool toCache)
	{
	std::optional<nlohmann::json> registryTmp;
	auto& registryOpt = (_registry) ? _registry : registryTmp;
	if (!registryOpt)
	{
	registryOpt = readRegistry(_registryFile);
	if (!registryOpt)
	{
	return std::nullopt;
	}
	else if (toCache)
	{
	// Save message registry in memory for peltool
	_registry = std::move(registryTmp);
	}
	}
	auto& reg = (_registry) ? _registry : registryTmp;
	const auto& registry = reg.value();
	// Find an entry with this name in the PEL array.
	auto e = std::find_if(
	registry["PELs"].begin(), registry["PELs"].end(),
	[&name, &type](const auto& j) {
	return ((name == j["Name"] && type == LookupType::name) \|\|
	(name == j["SRC"]["ReasonCode"] &&
	type == LookupType::reasonCode));
	});

	if (e != registry["PELs"].end())
	{
	// Fill in the Entry structure from the JSON. Most, but not all, fields
	// are optional.

	try
	{
	Entry entry;
	entry.name = (*e)["Name"];
	entry.subsystem = helper::getSubsystem((*e)["Subsystem"]);

	if (e->contains("ActionFlags"))
	{
	entry.actionFlags = helper::getActionFlags((*e)["ActionFlags"]);
	}

	if (e->contains("MfgActionFlags"))
	{
	entry.mfgActionFlags =
	helper::getActionFlags((*e)["MfgActionFlags"]);
	}

	if (e->contains("Severity"))
	{
	entry.severity = helper::getSeverities((*e)["Severity"]);
	}

	if (e->contains("MfgSeverity"))
	{
	entry.mfgSeverity = helper::getSeverities((*e)["MfgSeverity"]);
	}

	if (e->contains("EventType"))
	{
	entry.eventType = helper::getEventType((*e)["EventType"]);
	}

	if (e->contains("EventScope"))
	{
	entry.eventScope = helper::getEventScope((*e)["EventScope"]);
	}

	auto& src = (*e)["SRC"];
	entry.src.reasonCode = helper::getSRCReasonCode(src, name);

	if (src.contains("Type"))
	{
	entry.src.type = helper::getSRCType(src, name);
	}
	else
	{
	entry.src.type = static_cast<uint8_t>(SRCType::bmcError);
	}

	// Now that we know the SRC type and reason code,
	// we can get the component ID.
	entry.componentID = helper::getComponentID(
	entry.src.type, entry.src.reasonCode, *e, name);

	if (src.contains("Words6To9"))
	{
	entry.src.hexwordADFields =
	helper::getSRCHexwordFields(src, name);
	}

	if (src.contains("SymptomIDFields"))
	{
	entry.src.symptomID = helper::getSRCSymptomIDFields(src, name);
	}

	if (src.contains("PowerFault"))
	{
	entry.src.powerFault = src["PowerFault"];
	}

	auto& doc = (*e)["Documentation"];
	entry.doc.message = doc["Message"];
	entry.doc.description = doc["Description"];
	if (doc.contains("MessageArgSources"))
	{
	entry.doc.messageArgSources = doc["MessageArgSources"];
	}

	// If there are callouts defined, save the JSON for later
	if (_loadCallouts)
	{
	if (e->contains("Callouts"))
	{
	entry.callouts = (*e)["Callouts"];
	}
	else if (e->contains("CalloutsUsingAD"))
	{
	entry.callouts = (*e)["CalloutsUsingAD"];
	}
	}

	return entry;
	}
	catch (std::exception& e)
	{
	log<level::ERR>("Found invalid message registry field",
	entry("ERROR=%s", e.what()));
	}
	}

	return std::nullopt;
	}

	std::optional<nlohmann::json>
	Registry::readRegistry(const std::filesystem::path& registryFile)
	{
	// Look in /etc first in case someone put a test file there
	fs::path debugFile{fs::path{debugFilePath} / registryFileName};
	nlohmann::json registry;
	std::ifstream file;

	if (fs::exists(debugFile))
	{
	log<level::INFO>("Using debug PEL message registry");
	file.open(debugFile);
	}
	else
	{
	file.open(registryFile);
	}

	try
	{
	registry = nlohmann::json::parse(file);
	}
	catch (std::exception& e)
	{
	log<level::ERR>("Error parsing message registry JSON",
	entry("JSON_ERROR=%s", e.what()));
	return std::nullopt;
	}
	return registry;
	}

	std::vector<RegistryCallout>
	Registry::getCallouts(const nlohmann::json& calloutJSON,
	const std::string& systemType,
	const AdditionalData& additionalData)
	{
	// The JSON may either use an AdditionalData key
	// as an index, or not.
	if (helper::calloutUsesAdditionalData(calloutJSON))
	{
	return helper::getCalloutsUsingAD(calloutJSON, systemType,
	additionalData);
	}

	return helper::getCalloutsWithoutAD(calloutJSON, systemType);
	}

	} // namespace message
	} // namespace pels
	} // namespace openpower