szaszm commented on a change in pull request #1152:
URL: https://github.com/apache/nifi-minifi-cpp/pull/1152#discussion_r732604183
##########
File path: extensions/procfs/CPPLINT.cfg
##########
@@ -0,0 +1 @@
+filter=-runtime/int
Review comment:
Is this still relevant? I didn't see any `long` in the code and this
checks for `short`, `long`, and `long long` AFAIK.
##########
File path: extensions/procfs/CpuStat.cpp
##########
@@ -0,0 +1,116 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 "CpuStat.h"
+
+namespace org::apache::nifi::minifi::procfs {
+
+std::optional<CpuStatData> CpuStatData::parseCpuStatLine(std::istringstream&
iss) {
Review comment:
This only depends on the `std::istream` interface, consider relaxing the
requirements by accepting `std::istream&`.
##########
File path: extensions/procfs/CpuStat.h
##########
@@ -0,0 +1,140 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.
+ */
+
+#pragma once
+
+#include <sstream>
+#include <string>
+#include <utility>
+#include <optional>
+#include "rapidjson/document.h"
+
+namespace org::apache::nifi::minifi::procfs {
+
+class CpuStatData {
+ CpuStatData() = default;
+
+ public:
+ CpuStatData(const CpuStatData& src) = default;
+ CpuStatData(CpuStatData&& src) noexcept = default;
+
+ static std::optional<CpuStatData> parseCpuStatLine(std::istringstream& iss);
+
+ bool operator>=(const CpuStatData &rhs) const;
+ bool operator==(const CpuStatData &rhs) const;
+ CpuStatData operator-(const CpuStatData &rhs) const;
+
+ uint64_t getUser() const { return user_; }
+ uint64_t getNice() const { return nice_; }
+ uint64_t getSystem() const { return system_; }
+ uint64_t getIdle() const { return idle_; }
+ uint64_t getIoWait() const { return io_wait_; }
+ uint64_t getIrq() const { return irq_; }
+ uint64_t getSoftIrq() const { return soft_irq_; }
+ uint64_t getSteal() const { return steal_; }
+ uint64_t getGuest() const { return guest_; }
+ uint64_t getGuestNice() const { return guest_nice_; }
+
+ uint64_t getIdleAll() const { return idle_ + io_wait_; }
+ uint64_t getSystemAll() const { return system_ + irq_ + soft_irq_; }
+ uint64_t getVirtAll() const { return guest_ + guest_nice_; }
+ uint64_t getTotal() const { return user_ + nice_ + getSystemAll() +
getIdleAll() + steal_ + getVirtAll(); }
Review comment:
Cosider using `[[nodiscard]]` and `noexcept` on getters
##########
File path: extensions/procfs/CpuStat.cpp
##########
@@ -0,0 +1,116 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 "CpuStat.h"
+
+namespace org::apache::nifi::minifi::procfs {
+
+std::optional<CpuStatData> CpuStatData::parseCpuStatLine(std::istringstream&
iss) {
+ CpuStatData data;
+ iss >> data.user_ >> data.nice_ >> data.system_ >> data.idle_ >>
data.io_wait_ >> data.irq_ >> data.soft_irq_ >> data.steal_ >> data.guest_ >>
data.guest_nice_;
+ if (iss.fail())
+ return std::nullopt;
+ data.user_ -= data.guest_; // Guest time is already accounted in usertime
+ data.nice_ -= data.guest_nice_;
+ return data;
+}
+
+bool CpuStatData::operator>=(const CpuStatData &rhs) const {
+ return user_ >= rhs.user_
+ && nice_ >= rhs.nice_
+ && system_ >= rhs.system_
+ && idle_ >= rhs.idle_
+ && io_wait_ >= rhs.io_wait_
+ && irq_ >= rhs.irq_
+ && soft_irq_ >= rhs.soft_irq_
+ && steal_ >= rhs.steal_
+ && guest_ >= rhs.guest_
+ && guest_nice_ >= rhs.guest_nice_;
+}
Review comment:
Does this implementation makes sense? It can happen that both `a < b &&
b < a` are true. If you want lexicographical comparison instead, you can use an
explicitly defaulted `operator<=>` instead of both implemented operators.
##########
File path: CMakeLists.txt
##########
@@ -587,6 +587,14 @@ if (ENABLE_SYSTEMD)
createExtension(SYSTEMD-EXTENSIONS "SYSTEMD EXTENSIONS" "Enabled log
collection from journald" "extensions/systemd" "extensions/systemd/tests")
endif()
+## Add the procfs extension
+if(CMAKE_SYSTEM_NAME STREQUAL "Linux")
Review comment:
This has no extra dependencies other than procfs, which is already
present on all systems. I would consider adding it to standard-processors on
linux.
##########
File path: extensions/procfs/CpuStat.h
##########
@@ -0,0 +1,140 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.
+ */
+
+#pragma once
+
+#include <sstream>
+#include <string>
+#include <utility>
+#include <optional>
+#include "rapidjson/document.h"
+
+namespace org::apache::nifi::minifi::procfs {
+
+class CpuStatData {
+ CpuStatData() = default;
+
+ public:
+ CpuStatData(const CpuStatData& src) = default;
+ CpuStatData(CpuStatData&& src) noexcept = default;
+
+ static std::optional<CpuStatData> parseCpuStatLine(std::istringstream& iss);
+
+ bool operator>=(const CpuStatData &rhs) const;
+ bool operator==(const CpuStatData &rhs) const;
+ CpuStatData operator-(const CpuStatData &rhs) const;
+
+ uint64_t getUser() const { return user_; }
+ uint64_t getNice() const { return nice_; }
+ uint64_t getSystem() const { return system_; }
+ uint64_t getIdle() const { return idle_; }
+ uint64_t getIoWait() const { return io_wait_; }
+ uint64_t getIrq() const { return irq_; }
+ uint64_t getSoftIrq() const { return soft_irq_; }
+ uint64_t getSteal() const { return steal_; }
+ uint64_t getGuest() const { return guest_; }
+ uint64_t getGuestNice() const { return guest_nice_; }
+
+ uint64_t getIdleAll() const { return idle_ + io_wait_; }
+ uint64_t getSystemAll() const { return system_ + irq_ + soft_irq_; }
+ uint64_t getVirtAll() const { return guest_ + guest_nice_; }
+ uint64_t getTotal() const { return user_ + nice_ + getSystemAll() +
getIdleAll() + steal_ + getVirtAll(); }
+
+ private:
+ uint64_t user_;
+ uint64_t nice_;
+ uint64_t system_;
+ uint64_t idle_;
+ uint64_t io_wait_;
+ uint64_t irq_;
+ uint64_t soft_irq_;
+ uint64_t steal_;
+ uint64_t guest_;
+ uint64_t guest_nice_;
+};
+
+class CpuStat {
+ public:
+ static constexpr const char USER_STR[] = "user time";
+ static constexpr const char NICE_STR[] = "nice time";
+ static constexpr const char SYSTEM_STR[] = "system time";
+ static constexpr const char IDLE_STR[] = "idle time";
+ static constexpr const char IO_WAIT_STR[] = "io wait time";
+ static constexpr const char IRQ_STR[] = "irq time";
+ static constexpr const char SOFT_IRQ_STR[] = "soft irq time";
+ static constexpr const char STEAL_STR[] = "steal time";
+ static constexpr const char GUEST_STR[] = "guest time";
+ static constexpr const char GUEST_NICE_STR[] = "guest nice time";
+
+ CpuStat(const CpuStat& src) = default;
+ CpuStat(CpuStat&& src) noexcept = default;
+
Review comment:
The class would be simpler without these lines, since all of the [rule
of
five](https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#c21-if-you-define-or-delete-any-copy-move-or-destructor-function-define-or-delete-them-all)
operations are defaulted in one way or another.
##########
File path: extensions/procfs/CpuStat.h
##########
@@ -0,0 +1,140 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.
+ */
+
+#pragma once
+
+#include <sstream>
+#include <string>
+#include <utility>
+#include <optional>
+#include "rapidjson/document.h"
+
+namespace org::apache::nifi::minifi::procfs {
+
+class CpuStatData {
+ CpuStatData() = default;
+
+ public:
+ CpuStatData(const CpuStatData& src) = default;
+ CpuStatData(CpuStatData&& src) noexcept = default;
+
+ static std::optional<CpuStatData> parseCpuStatLine(std::istringstream& iss);
+
+ bool operator>=(const CpuStatData &rhs) const;
+ bool operator==(const CpuStatData &rhs) const;
+ CpuStatData operator-(const CpuStatData &rhs) const;
+
+ uint64_t getUser() const { return user_; }
+ uint64_t getNice() const { return nice_; }
+ uint64_t getSystem() const { return system_; }
+ uint64_t getIdle() const { return idle_; }
+ uint64_t getIoWait() const { return io_wait_; }
+ uint64_t getIrq() const { return irq_; }
+ uint64_t getSoftIrq() const { return soft_irq_; }
+ uint64_t getSteal() const { return steal_; }
+ uint64_t getGuest() const { return guest_; }
+ uint64_t getGuestNice() const { return guest_nice_; }
+
+ uint64_t getIdleAll() const { return idle_ + io_wait_; }
+ uint64_t getSystemAll() const { return system_ + irq_ + soft_irq_; }
+ uint64_t getVirtAll() const { return guest_ + guest_nice_; }
+ uint64_t getTotal() const { return user_ + nice_ + getSystemAll() +
getIdleAll() + steal_ + getVirtAll(); }
+
+ private:
+ uint64_t user_;
+ uint64_t nice_;
+ uint64_t system_;
+ uint64_t idle_;
+ uint64_t io_wait_;
+ uint64_t irq_;
+ uint64_t soft_irq_;
+ uint64_t steal_;
+ uint64_t guest_;
+ uint64_t guest_nice_;
+};
+
+class CpuStat {
+ public:
+ static constexpr const char USER_STR[] = "user time";
+ static constexpr const char NICE_STR[] = "nice time";
+ static constexpr const char SYSTEM_STR[] = "system time";
+ static constexpr const char IDLE_STR[] = "idle time";
+ static constexpr const char IO_WAIT_STR[] = "io wait time";
+ static constexpr const char IRQ_STR[] = "irq time";
+ static constexpr const char SOFT_IRQ_STR[] = "soft irq time";
+ static constexpr const char STEAL_STR[] = "steal time";
+ static constexpr const char GUEST_STR[] = "guest time";
+ static constexpr const char GUEST_NICE_STR[] = "guest nice time";
+
+ CpuStat(const CpuStat& src) = default;
+ CpuStat(CpuStat&& src) noexcept = default;
+
+ CpuStat(std::string cpu_name, CpuStatData data) :
cpu_name_(std::move(cpu_name)), data_(data) {}
+
+ void addToJson(rapidjson::Value& body, rapidjson::Document::AllocatorType&
alloc) const;
+ const CpuStatData& getData() const { return data_; }
+ const std::string& getName() const { return cpu_name_; }
+
+ protected:
+ std::string cpu_name_;
+ CpuStatData data_;
+};
+
+class CpuStatPeriod {
+ CpuStatPeriod(std::string cpu_name, double period, CpuStatData data_diff) :
cpu_name_(std::move(cpu_name)), period_(period), data_diff_(data_diff) {}
+
+ public:
+ static constexpr const char USER_PERCENT_STR[] = "user time %";
+ static constexpr const char NICE_PERCENT_STR[] = "nice time %";
+ static constexpr const char SYSTEM_PERCENT_STR[] = "system time %";
+ static constexpr const char IDLE_PERCENT_STR[] = "idle time %";
+ static constexpr const char IO_WAIT_PERCENT_STR[] = "io wait time %";
+ static constexpr const char IRQ_PERCENT_STR[] = "irq time %";
+ static constexpr const char SOFT_IRQ_PERCENT_STR[] = "soft irq %";
+ static constexpr const char STEAL_PERCENT_STR[] = "steal time %";
+ static constexpr const char GUEST_PERCENT_STR[] = "guest time %";
+ static constexpr const char GUEST_NICE_PERCENT_STR[] = "guest nice time %";
+
+ CpuStatPeriod(const CpuStatPeriod& src) = default;
+ CpuStatPeriod(CpuStatPeriod&& src) noexcept = default;
Review comment:
same here
##########
File path: extensions/procfs/CpuStat.h
##########
@@ -0,0 +1,140 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.
+ */
+
+#pragma once
+
+#include <sstream>
+#include <string>
+#include <utility>
+#include <optional>
+#include "rapidjson/document.h"
+
+namespace org::apache::nifi::minifi::procfs {
+
+class CpuStatData {
+ CpuStatData() = default;
+
+ public:
+ CpuStatData(const CpuStatData& src) = default;
+ CpuStatData(CpuStatData&& src) noexcept = default;
Review comment:
Follow the [rule of
zero](https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#c20-if-you-can-avoid-defining-default-operations-do)
##########
File path: extensions/procfs/MemInfo.h
##########
@@ -0,0 +1,51 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.
+ */
+
+#pragma once
+
+#include <string>
+#include <sstream>
+#include <fstream>
+#include <optional>
+#include "rapidjson/document.h"
+
+namespace org::apache::nifi::minifi::procfs {
+
+class MemInfo {
+ MemInfo() = default;
+
+ public:
+ MemInfo(const MemInfo& src) = default;
+ MemInfo(MemInfo&& src) noexcept = default;
+ static std::optional<MemInfo> parseMemInfoFile(std::ifstream& mem_info_file);
+
+ void addToJson(rapidjson::Value& body, rapidjson::Document::AllocatorType&
alloc) const;
+
+ uint64_t getTotalMemory() const { return memory_total_; }
+ uint64_t getFreeMemory() const { return memory_free_; }
+ uint64_t getAvailableMemory() const { return memory_available_; }
+ uint64_t getTotalSwap() const { return swap_total_; }
+ uint64_t getFreeSwap() const { return swap_free_; }
Review comment:
Please consider adding `[[nodiscard]]` and `noexcept` to all getters.
##########
File path: extensions/procfs/DiskStat.h
##########
@@ -0,0 +1,152 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.
+ */
+
+#pragma once
+
+#include <sstream>
+#include <string>
+#include <chrono>
+#include <optional>
+#include "rapidjson/document.h"
+
+namespace org::apache::nifi::minifi::procfs {
+
+class DiskStatData {
+ DiskStatData() = default;
+
+ public:
+ struct MonotonicIncreasingMembers {
+ uint64_t reads_completed_;
+ uint64_t reads_merged_;
+ uint64_t sectors_read_;
+ uint64_t milliseconds_spent_reading_;
+ uint64_t writes_completed_;
+ uint64_t writes_merges_;
+ uint64_t sectors_written_;
+ uint64_t milliseconds_spent_writing_;
+ uint64_t milliseconds_spent_io_;
+ uint64_t weighted_milliseconds_spent_io_;
+
+ bool operator>=(const MonotonicIncreasingMembers& rhs) const {
+ return reads_completed_ >= rhs.reads_completed_
+ && reads_merged_ >= rhs.reads_merged_
+ && sectors_read_ >= rhs.sectors_read_
+ && milliseconds_spent_reading_ >= rhs.milliseconds_spent_reading_
+ && writes_completed_ >= rhs.writes_completed_
+ && writes_merges_ >= rhs.writes_merges_
+ && sectors_written_ >= rhs.sectors_written_
+ && milliseconds_spent_writing_ >= rhs.milliseconds_spent_writing_
+ && milliseconds_spent_io_ >= rhs.milliseconds_spent_io_
+ && weighted_milliseconds_spent_io_ >=
rhs.weighted_milliseconds_spent_io_;
+ }
+ };
+ static std::optional<DiskStatData> parseDiskStatLine(std::istringstream&
iss) {
+ DiskStatData disk_stat_data;
+ iss >> disk_stat_data.major_device_number_ >>
disk_stat_data.minor_device_number_ >> disk_stat_data.disk_name >>
disk_stat_data.monotonic_increasing_members_.reads_completed_
+ >> disk_stat_data.monotonic_increasing_members_.reads_merged_ >>
disk_stat_data.monotonic_increasing_members_.sectors_read_
+ >>
disk_stat_data.monotonic_increasing_members_.milliseconds_spent_reading_ >>
disk_stat_data.monotonic_increasing_members_.writes_completed_
+ >> disk_stat_data.monotonic_increasing_members_.writes_merges_ >>
disk_stat_data.monotonic_increasing_members_.sectors_written_
+ >>
disk_stat_data.monotonic_increasing_members_.milliseconds_spent_reading_ >>
disk_stat_data.monotonic_increasing_members_.writes_completed_
+ >> disk_stat_data.monotonic_increasing_members_.writes_merges_ >>
disk_stat_data.monotonic_increasing_members_.sectors_written_
+ >>
disk_stat_data.monotonic_increasing_members_.milliseconds_spent_writing_ >>
disk_stat_data.ios_in_progress_ >> disk_stat_data.ios_in_progress_
+ >> disk_stat_data.monotonic_increasing_members_.milliseconds_spent_io_
>> disk_stat_data.monotonic_increasing_members_.weighted_milliseconds_spent_io_;
+
+ if (iss.fail())
+ return std::nullopt;
+ return disk_stat_data;
+ }
+
+ uint64_t getMajorDeviceNumber() const { return major_device_number_; }
+ uint64_t getMinorDeviceNumber() const { return minor_device_number_; }
+ const std::string& getDiskName() const { return disk_name; }
+ uint64_t getReadsCompleted() const { return
monotonic_increasing_members_.reads_completed_; }
+ uint64_t getReadsMerged() const { return
monotonic_increasing_members_.reads_merged_; }
+ uint64_t getSectorsRead() const { return
monotonic_increasing_members_.sectors_read_; }
+ uint64_t getMillisecondsSpentReading() const { return
monotonic_increasing_members_.milliseconds_spent_reading_; }
+ uint64_t getWritesCompleted() const { return
monotonic_increasing_members_.writes_completed_; }
+ uint64_t getWritesMerged() const { return
monotonic_increasing_members_.writes_merges_; }
+ uint64_t getSectorsWritten() const { return
monotonic_increasing_members_.sectors_written_; }
+ uint64_t getMillisecondsSpentWriting() const { return
monotonic_increasing_members_.milliseconds_spent_writing_; }
+ uint64_t getIosInProgress() const { return ios_in_progress_; }
+ uint64_t getMillisecondsSpentIo() const { return
monotonic_increasing_members_.milliseconds_spent_io_; }
+ uint64_t getWeightedMillisecondsSpentIo() const { return
monotonic_increasing_members_.weighted_milliseconds_spent_io_; }
+
+ const MonotonicIncreasingMembers& getMonotonicIncreasingMembers() const {
return monotonic_increasing_members_; }
+
+ private:
+ uint64_t major_device_number_;
+ uint64_t minor_device_number_;
+ std::string disk_name;
+ MonotonicIncreasingMembers monotonic_increasing_members_;
+ uint64_t ios_in_progress_;
+};
+
+class DiskStat {
+ public:
+ static constexpr const char DEVICE_MAJOR_NUMBER_STR[] = "Major Device
Number";
+ static constexpr const char DEVICE_MINOR_NUMBER_STR[] = "Minor Device
Number";
+ static constexpr const char READS_COMPLETED_STR[] = "Reads Completed";
+ static constexpr const char READS_MERGED_STR[] = "Reads Merged";
+ static constexpr const char SECTORS_READ_STR[] = "Sectors Read";
+ static constexpr const char WRITES_COMPLETED_STR[] = "Writes Completed";
+ static constexpr const char WRITES_MERGED_STR[] = "Writes Merged";
+ static constexpr const char SECTORS_WRITTEN_STR[] = "Sectors Written";
+ static constexpr const char IOS_IN_PROGRESS_STR[] = "IO-s in progress";
+
+ DiskStat(DiskStatData disk_stat_data,
std::chrono::time_point<std::chrono::system_clock> time_point) :
data_(disk_stat_data), time_point_(time_point) {}
+ void addToJson(rapidjson::Value& body, rapidjson::Document::AllocatorType&
alloc) const;
Review comment:
Avoid mixing the data and serialization, because of the SRP.
Would it be possible to refactor the code in a way that the data is an
object and the serialization function is a free function that serializes the
data? It doesn't even have to depend on rapidjson, just take a callback and
call it for every data point.
```c++
void serialize(const DiskStatData& data, std::invocable<std::string_view /*
key */, std::string_view /* value */> auto append_callback) {
append_callback(DEVICE_MAJOR_NUMBER_STR, major_device_number_);
// ...
}
// on the call site:
serialize(data, [&device_stat_json, &alloc](std::string_view key,
std::string_view data) { device_stat_json.AddMember(key, value, alloc); });
```
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