[GitHub] [nifi-minifi-cpp] martinzink commented on a diff in pull request #1152: MINIFICPP-1593 ProcFsMonitor to monitor /proc pseduo filesystem

[GitBox <gi...@apache.org>]

martinzink commented on code in PR #1152:
URL: https://github.com/apache/nifi-minifi-cpp/pull/1152#discussion_r842679992


##########
extensions/procfs/ProcFs.h:
##########
@@ -0,0 +1,64 @@
+/**
+ * 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 <unistd.h>
+
+#include <unordered_map>
+#include <utility>
+#include <string>
+#include <optional>
+#include <filesystem>
+#include <memory>
+
+#include "ProcessStat.h"
+#include "MemInfo.h"
+#include "CpuStat.h"
+#include "NetDev.h"
+#include "DiskStat.h"
+
+#include "core/logging/LoggerConfiguration.h"
+#include "core/logging/Logger.h"
+
+namespace org::apache::nifi::minifi::extensions::procfs {
+
+class ProcFs {
+  static constexpr const char* DEFAULT_ROOT_PATH = "/proc";
+  static constexpr const char* MEMINFO_FILE = "meminfo";
+  static constexpr const char* STAT_FILE = "stat";
+  static constexpr const char* NET_DEV_FILE = "net/dev";
+  static constexpr const char* DISK_STATS_FILE = "diskstats";
+ public:
+  explicit ProcFs(std::filesystem::path path = DEFAULT_ROOT_PATH)
+      : root_path_(std::move(path)) {
+  }
+
+  [[nodiscard]] std::unordered_map<pid_t, ProcessStat> getProcessStats() const;
+  [[nodiscard]] std::unordered_map<std::string, CpuStatData> getCpuStats() const;
+  [[nodiscard]] std::optional<MemInfo> getMemInfo() const;
+  [[nodiscard]] std::unordered_map<std::string, NetDevData> getNetDevs() const;
+  [[nodiscard]] std::unordered_map<std::string, DiskStatData> getDiskStats() const;

Review Comment:
   I changed the FlatMaps to vector of pairs in https://github.com/apache/nifi-minifi-cpp/pull/1152/commits/da1e32e1bec73705ccad155130947615bb70f804
   I also refactored a bit so the processXYZInformation functions are not as overwhelming anymore. 



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