[GitHub] [nifi-minifi-cpp] martinzink commented on a diff in pull request #1367: MINIFICPP-1822 - Add alert capability

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

martinzink commented on code in PR #1367:
URL: https://github.com/apache/nifi-minifi-cpp/pull/1367#discussion_r941662489


##########
libminifi/include/core/logging/alert/AlertSink.h:
##########
@@ -0,0 +1,112 @@
+/**
+ * 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 <deque>
+#include <mutex>
+#include <unordered_set>
+#include <regex>
+#include <utility>
+#include <string>
+#include <memory>
+
+#include "core/controller/ControllerServiceProvider.h"
+#include "core/logging/LoggerProperties.h"
+#include "utils/ThreadPool.h"
+#include "utils/StagingQueue.h"
+#include "properties/Configure.h"
+#include "spdlog/sinks/base_sink.h"
+
+namespace org::apache::nifi::minifi::controllers {
+class SSLContextService;
+}  // namespace org::apache::nifi::minifi::controllers
+
+namespace org::apache::nifi::minifi::core::logging {
+
+class AlertSink : public spdlog::sinks::base_sink<std::mutex> {
+  struct Config {
+    std::string url;
+    std::optional<std::string> ssl_service_name;
+    int batch_size;
+    std::chrono::milliseconds flush_period;
+    std::chrono::milliseconds rate_limit;
+    int buffer_limit;
+    std::regex filter;
+    spdlog::level::level_enum level;
+  };
+
+  struct Services {
+    std::shared_ptr<controllers::SSLContextService> ssl_service;
+    std::shared_ptr<AgentIdentificationProvider> agent_id;
+  };
+
+  struct LogBuffer {
+    size_t size_{0};
+    std::deque<std::pair<std::string, size_t>> data_;
+
+    static LogBuffer allocate(size_t size);
+    LogBuffer commit();
+    [[nodiscard]]
+    size_t size() const;
+  };
+
+  class LiveLogSet {
+    using Hash = size_t;
+    std::chrono::milliseconds lifetime_{};
+    std::unordered_set<Hash> hashes_to_ignore_;
+    std::deque<std::pair<std::chrono::milliseconds, Hash>> timestamped_hashes_;
+   public:
+    bool tryAdd(std::chrono::milliseconds now, Hash hash);
+    void setLifetime(std::chrono::milliseconds lifetime);
+  };
+
+ public:
+  // must be public for make_shared
+  AlertSink(Config config, std::shared_ptr<Logger> logger);

Review Comment:
   I faced a similar problem recently and this can be made private with a trick like this
   https://github.com/apache/nifi-minifi-cpp/pull/1383/files#diff-4205c4389dbd9a8dee16d4d38da02ada57c19d038893abdcb3f29424c7d1dd86R112-R124



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