[GitHub] [nifi-minifi-cpp] adamdebreceni commented on a diff in pull request #1413: MINIFICPP-1917 - Generate flow config JSON schema

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

adamdebreceni commented on code in PR #1413:
URL: https://github.com/apache/nifi-minifi-cpp/pull/1413#discussion_r1042158041


##########
minifi_main/JsonSchema.cpp:
##########
@@ -0,0 +1,436 @@
+/**
+ * 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 "JsonSchema.h"
+
+#include <string>
+#include <unordered_map>
+#include <vector>
+
+#include "agent/agent_version.h"
+#include "agent/build_description.h"
+#include "rapidjson/document.h"
+#include "rapidjson/prettywriter.h"
+#include "RemoteProcessorGroupPort.h"
+#include "utils/gsl.h"
+
+#include "range/v3/view/filter.hpp"
+#include "range/v3/view/transform.hpp"
+#include "range/v3/view/join.hpp"
+#include "range/v3/range/conversion.hpp"
+
+namespace org::apache::nifi::minifi::docs {
+
+static std::string escape(std::string str) {
+  utils::StringUtils::replaceAll(str, "\"", "\\\"");
+  utils::StringUtils::replaceAll(str, "\n", "\\n");
+  return str;
+}
+
+static std::string prettifyJson(const std::string& str) {
+  rapidjson::Document doc;
+  rapidjson::ParseResult res = doc.Parse(str.c_str(), str.length());
+  gsl_Assert(res);
+
+  rapidjson::StringBuffer buffer;
+
+  rapidjson::PrettyWriter<rapidjson::StringBuffer> writer(buffer);
+  doc.Accept(writer);
+
+  return std::string{buffer.GetString(), buffer.GetSize()};
+}
+
+void writePropertySchema(const core::Property& prop, std::ostream& out) {
+  out << "\"" << escape(prop.getName()) << "\" : {";
+  out << R"("description": ")" << escape(prop.getDescription()) << "\"";
+  if (const auto& values = prop.getAllowedValues(); !values.empty()) {
+    out << R"(, "enum": [)"
+        << (values
+            | ranges::views::transform([] (auto& val) {return '"' + escape(val.to_string()) + '"';})
+            | ranges::views::join(std::string{','})
+            | ranges::to<std::string>())
+        << "]";
+  }
+  if (const auto& def_value = prop.getDefaultValue(); !def_value.empty()) {
+    const auto& type = def_value.getTypeInfo();
+    // order is important as both DataSizeValue and TimePeriodValue's type_id is uint64_t
+    if (std::dynamic_pointer_cast<core::DataSizeValue>(def_value.getValue())
+        || std::dynamic_pointer_cast<core::TimePeriodValue>(def_value.getValue())) { // NOLINT(bugprone-branch-clone)
+      // special value types
+      out << R"(, "type": "string", "default": ")" << escape(def_value.to_string()) << "\"";
+    } else if (type == state::response::Value::INT_TYPE
+        || type == state::response::Value::INT64_TYPE
+        || type == state::response::Value::UINT32_TYPE
+        || type == state::response::Value::UINT64_TYPE) {
+      out << R"(, "type": "integer", "default": )" << static_cast<int64_t>(def_value);
+    } else if (type == state::response::Value::DOUBLE_TYPE) {
+      out << R"(, "type": "number", "default": )" << static_cast<double>(def_value);
+    } else if (type == state::response::Value::BOOL_TYPE) {
+      out << R"(, "type": "boolean", "default": )" << (static_cast<bool>(def_value) ? "true" : "false");
+    } else {
+      out << R"(, "type": "string", "default": ")" << escape(def_value.to_string()) << "\"";
+    }
+  } else {
+    // no default value, no type information, fallback to string
+    out << R"(, "type": "string")";
+  }
+  out << "}";  // property.getName()
+}
+
+template<typename PropertyContainer>
+void writeProperties(const PropertyContainer& props, bool supports_dynamic, std::ostream& out) {
+  out << R"("Properties": {)"
+        << R"("type": "object",)"
+        << R"("additionalProperties": )" << (supports_dynamic? "true" : "false") << ","
+        << R"("required": [)"
+        << (props
+            | ranges::views::filter([] (auto& prop) {return prop.getRequired() && prop.getDefaultValue().empty();})
+            | ranges::views::transform([] (auto& prop) {return '"' + escape(prop.getName()) + '"';})
+            | ranges::views::join(std::string{','})
+            | ranges::to<std::string>())
+        << "]";
+
+  out << R"(, "properties": {)";
+  for (size_t prop_idx = 0; prop_idx < props.size(); ++prop_idx) {
+    const auto& property = props[prop_idx];
+    if (prop_idx != 0) out << ",";
+    writePropertySchema(property, out);
+  }
+  out << "}";  // "properties"
+  out << "}";  // "Properties"
+}
+
+static std::string buildSchema(const std::unordered_map<std::string, std::string>& relationships, const std::string& processors, const std::string& controller_services) {
+  std::stringstream all_rels;
+  for (const auto& [name, rels] : relationships) {
+    all_rels << "\"relationships-" << escape(name) << "\": " << rels << ", ";
+  }
+
+  std::stringstream remote_port_props;
+  writeProperties(minifi::RemoteProcessorGroupPort::properties(), minifi::RemoteProcessorGroupPort::SupportsDynamicProperties, remote_port_props);
+
+  std::string process_group_properties = R"(
+    "Processors": {
+      "type": "array",
+      "items": {"$ref": "#/$defs/processor"}
+    },
+    "Connections": {
+      "type": "array",
+      "items": {"$ref": "#/$defs/connection"}
+    },
+    "Controller Services": {
+      "type": "array",
+      "items": {"$ref": "#/$defs/controller_service"}
+    },
+    "Remote Process Groups": {
+      "type": "array",
+      "items": {"$ref": "#/$defs/remote_process_group"}
+    },
+    "Process Groups": {
+      "type": "array",
+      "items": {"$ref": "#/$defs/simple_process_group"}
+    },
+    "Funnels": {
+      "type": "array",
+      "items": {"$ref": "#/$defs/funnel"}
+    }
+  )";
+
+  std::stringstream cron_pattern;
+  {
+    const char* all = "\\\\*";
+    const char* any = "\\\\?";
+    const char* increment = "(-?[0-9]+)";
+    const char* secs = "([0-5]?[0-9])";
+    const char* mins = "([0-5]?[0-9])";
+    const char* hours = "(1?[0-9]|2[0-3])";
+    const char* days = "([1-2]?[0-9]|3[0-1])";
+    const char* months = "([0-9]|1[0-2]|jan|feb|mar|apr|may|jun|jul|aug|sep|oct|nov|dec)";
+    const char* weekdays = "([0-7]|sun|mon|tue|wed|thu|fri|sat)";
+    const char* years = "([0-9]+)";
+
+    auto makeCommon = [&] (const char* pattern) {
+      std::stringstream common;
+      common << all << "|" << any
+        << "|" << pattern << "(," << pattern << ")*"
+        << "|" << pattern << "-" << pattern
+        << "|" << "(" << all << "|" << pattern << ")" << "/" << increment;
+      return std::move(common).str();
+    };
+
+    cron_pattern << "(?i)^"
+      << "(" << makeCommon(secs) << ")"
+      << " (" << makeCommon(mins) << ")"
+      << " (" << makeCommon(hours) << ")"
+      << " (" << makeCommon(days) << "|LW|L|L-" << days << "|" << days << "W" << ")"
+      << " (" << makeCommon(months) << ")"
+      << " (" << makeCommon(weekdays) << "|" << weekdays << "?L|" << weekdays << "#" << "[1-5]" << ")"
+      << "( (" << makeCommon(years) << "))?"
+      << "$";
+
+  }
+
+  return prettifyJson(R"(
+{
+  "$schema": "http://json-schema.org/draft-07/schema",

Review Comment:
   yes, good idea, added in [f939b06](https://github.com/apache/nifi-minifi-cpp/pull/1413/commits/f939b06657939ba54c325fbf462c4a04bc8286da)



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