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| Original file line number | Diff line number | Diff line change |
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| #pragma once | ||
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| #include "kafka/Project.h" | ||
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| // https://github.com/Tencent/rapidjson/releases/tag/v1.1.0 | ||
| #include "rapidjson/document.h" | ||
| #include "rapidjson/stringbuffer.h" | ||
| #include "rapidjson/writer.h" | ||
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| #include <algorithm> | ||
| #include <iostream> | ||
| #include <sstream> | ||
| #include <stdexcept> | ||
| #include <string> | ||
| #include <utility> | ||
| #include <vector> | ||
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| namespace KAFKA_API { | ||
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| /** | ||
| * \brief Helps to parse the metrics string with JSON format. | ||
| */ | ||
| class KafkaMetrics | ||
| { | ||
| public: | ||
| /** | ||
| * \brief Initilize with the metrics string. | ||
| */ | ||
| explicit KafkaMetrics(std::string jsonMetrics); | ||
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| static const constexpr char* WILDCARD = "*"; | ||
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| using KeysType = std::vector<std::string>; | ||
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| /** | ||
| * \brief The matched keys (for wildcards) and the value. | ||
| */ | ||
| template<typename ValueType> | ||
| using ResultsType = std::vector<std::pair<KeysType, ValueType>>; | ||
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| /** | ||
| * \brief Get integer value(s) for the specified metrics. | ||
| * Note: the wildcard ("*") is supported. | ||
| */ | ||
| ResultsType<std::int64_t> getInt(const KeysType& keys) { return get<std::int64_t>(keys); } | ||
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| /** | ||
| * \brief Get string value(s) for the specified metrics. | ||
| * Note: the wildcard ("*") is supported. | ||
| */ | ||
| ResultsType<std::string> getString(const KeysType& keys) { return get<std::string>(keys); } | ||
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| static std::string toString(const KafkaMetrics::KeysType& keys); | ||
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| template<typename ValueType> | ||
| static std::string toString(const KafkaMetrics::ResultsType<ValueType>& results); | ||
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| private: | ||
| template<typename ValueType> | ||
| ResultsType<ValueType> get(const KeysType& keys); | ||
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| template<typename ValueType> | ||
| void getResults(ResultsType<ValueType>& results, | ||
| KeysType& keysForWildcards, | ||
| rapidjson::Value::ConstMemberIterator iter, | ||
| KeysType::const_iterator keysToParse, | ||
| KeysType::const_iterator keysEnd); | ||
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| template<typename ValueType> | ||
| static ValueType getValue(rapidjson::Value::ConstMemberIterator iter); | ||
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| #if COMPILER_SUPPORTS_CPP_17 | ||
| std::string _decodeBuf; | ||
| #else | ||
| std::vector<char> _decodeBuf; | ||
| #endif | ||
| rapidjson::Document _jsonDoc; | ||
| }; | ||
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| inline | ||
| KafkaMetrics::KafkaMetrics(std::string jsonMetrics) | ||
| #if COMPILER_SUPPORTS_CPP_17 | ||
| : _decodeBuf(std::move(jsonMetrics)) | ||
| #else | ||
| : _decodeBuf(jsonMetrics.cbegin(), jsonMetrics.cend() + 1) | ||
| #endif | ||
| { | ||
| if (_jsonDoc.ParseInsitu(_decodeBuf.data()).HasParseError()) | ||
| { | ||
| throw std::runtime_error("Failed to parse string with JSON format!"); | ||
| } | ||
| } | ||
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| template<> | ||
| inline std::int64_t | ||
| KafkaMetrics::getValue<std::int64_t>(rapidjson::Value::ConstMemberIterator iter) | ||
| { | ||
| return iter->value.GetInt(); | ||
| } | ||
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| template<> | ||
| inline std::string | ||
| KafkaMetrics::getValue<std::string>(rapidjson::Value::ConstMemberIterator iter) | ||
| { | ||
| return iter->value.GetString(); | ||
| } | ||
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| template<typename ValueType> | ||
| inline KafkaMetrics::ResultsType<ValueType> | ||
| KafkaMetrics::get(const KeysType& keys) | ||
| { | ||
| if (keys.empty()) throw std::invalid_argument("Input keys cannot be empty!"); | ||
| if (keys.front() == WILDCARD) throw std::invalid_argument("The first key cannot be wildcard!"); | ||
| if (keys.back() == WILDCARD) throw std::invalid_argument("The last key cannot be wildcard!"); | ||
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| ResultsType<ValueType> results; | ||
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| rapidjson::Value::ConstMemberIterator iter = _jsonDoc.FindMember(keys.front().c_str()); | ||
| if (iter == _jsonDoc.MemberEnd()) return results; | ||
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| if (keys.size() == 1) | ||
| { | ||
| if (std::is_same<ValueType, std::string>::value ? iter->value.IsString() : iter->value.IsInt()) | ||
| { | ||
| results.emplace_back(KeysType{}, getValue<ValueType>(iter)); | ||
| } | ||
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| return results; | ||
| } | ||
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| KeysType keysForWildcards; | ||
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| getResults(results, keysForWildcards, iter, keys.cbegin() + 1, keys.cend()); | ||
| return results; | ||
| } | ||
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| template<typename ValueType> | ||
| inline void | ||
| KafkaMetrics::getResults(KafkaMetrics::ResultsType<ValueType>& results, | ||
| KeysType& keysForWildcards, | ||
| rapidjson::Value::ConstMemberIterator iter, | ||
| KeysType::const_iterator keysToParse, | ||
| KeysType::const_iterator keysEnd) | ||
| { | ||
| if (!iter->value.IsObject()) return; | ||
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| const auto& key = *(keysToParse++); | ||
| const bool isTheEnd = (keysToParse == keysEnd); | ||
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| if (key == WILDCARD) | ||
| { | ||
| for (rapidjson::Value::ConstMemberIterator subIter = iter->value.MemberBegin(); subIter != iter->value.MemberEnd(); ++subIter) | ||
| { | ||
| KeysType newKeysForWildcards = keysForWildcards; | ||
| newKeysForWildcards.emplace_back(subIter->name.GetString()); | ||
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| getResults(results, newKeysForWildcards, subIter, keysToParse, keysEnd); | ||
| } | ||
| } | ||
| else | ||
| { | ||
| rapidjson::Value::ConstMemberIterator subIter = iter->value.FindMember(key.c_str()); | ||
| if (subIter == iter->value.MemberEnd()) return; | ||
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| if (!isTheEnd) | ||
| { | ||
| getResults(results, keysForWildcards, subIter, keysToParse, keysEnd); | ||
| } | ||
| else if (std::is_same<ValueType, std::string>::value ? subIter->value.IsString() : subIter->value.IsInt()) | ||
| { | ||
| results.emplace_back(keysForWildcards, getValue<ValueType>(subIter)); | ||
| } | ||
| } | ||
| } | ||
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| inline std::string | ||
| KafkaMetrics::toString(const KafkaMetrics::KeysType& keys) | ||
| { | ||
| std::string ret; | ||
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| std::for_each(keys.cbegin(), keys.cend(), | ||
| [&ret](const auto& key){ ret.append((ret.empty() ? std::string() : std::string(", ")) + "\"" + key + "\""); }); | ||
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| return ret; | ||
| } | ||
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| template<typename ValueType> | ||
| inline std::string | ||
| KafkaMetrics::toString(const KafkaMetrics::ResultsType<ValueType>& results) | ||
| { | ||
| std::ostringstream oss; | ||
| bool isTheFirstOne = true; | ||
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| std::for_each(results.cbegin(), results.cend(), | ||
| [&oss, &isTheFirstOne](const auto& result) { | ||
| const auto keysString = toString(result.first); | ||
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| oss << (isTheFirstOne ? (isTheFirstOne = false, "") : ", ") | ||
| << (keysString.empty() ? "" : (std::string("[") + keysString + "]:")); | ||
| oss << (std::is_same<ValueType, std::string>::value ? "\"" : "") << result.second << (std::is_same<ValueType, std::string>::value ? "\"" : ""); | ||
| }); | ||
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| return oss.str(); | ||
| } | ||
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| } // end of KAFKA_API | ||
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