Insights/src/SourceGenerator/KustoPartitioningPolicyBuilder.cs at main · NuGet/Insights · GitHub

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// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.

using System.Text.RegularExpressions;
using Microsoft.CodeAnalysis;

namespace NuGet.Insights
{
    public class KustoPartitioningPolicyBuilder : IPropertyVisitor
    {
        private const string AttributeName = "KustoPartitionKeyAttribute";
        private readonly int _intent;
        private readonly bool _escapeQuotes;
        private readonly StringBuilder _builder;

        public KustoPartitioningPolicyBuilder(int indent, bool escapeQuotes)
        {
            _intent = indent;
            _escapeQuotes = escapeQuotes;
            _builder = new StringBuilder();
        }

        public void OnProperty(SourceProductionContext context, CsvRecordModel model, CsvPropertyModel property)
        {
            if (!property.IsKustoPartitionKey)
            {
                return;
            }

            if (property.IsKustoIgnore)
            {
                context.ReportDiagnostic(Diagnostic.Create(
                    new DiagnosticDescriptor(
                        id: DiagnosticIds.IgnoredKustoPartitioningKey,
                        title: "An attribute was marked as both a Kusto partition key and it was ignored.",
                        messageFormat: "An attribute was marked as both a Kusto partition key and it was ignored.",
                        Constants.Category,
                        DiagnosticSeverity.Error,
                        isEnabledByDefault: true),
                    property.Locations.FirstOrDefault() ?? Location.None));
                return;
            }

            var policy = new PartitioningPolicy
            {
                PartitionKeys = new List<PartitionKey>
                {
                    new PartitionKey
                    {
                        ColumnName = property.Name,
                        Kind = "Hash",
                        Properties = new PartitionKeyProperties
                        {
                             Function = "XxHash64",
                             MaxPartitionCount = 256,
                        }
                    }
                }
            };

            var json = JsonSerializer.Serialize(policy, new JsonSerializerOptions { WriteIndented = true });

            if (_escapeQuotes)
            {
                json = json.Replace("\"", "\"\"");
            }

            var jsonLines = json.Split(new[] { '\n', '\r' }, StringSplitOptions.RemoveEmptyEntries);

            if (_builder.Length > 0)
            {
                context.ReportDiagnostic(Diagnostic.Create(
                    new DiagnosticDescriptor(
                        id: DiagnosticIds.MultipleKustoPartioningKeys,
                        title: $"Multiple {AttributeName} attributes were defined on a single type.",
                        messageFormat: $"Multiple {AttributeName} attributes were defined on a single type.",
                        Constants.Category,
                        DiagnosticSeverity.Error,
                        isEnabledByDefault: true),
                    property.Locations.FirstOrDefault() ?? Location.None));
                return;
            }

            foreach (var line in jsonLines)
            {
                if (_builder.Length > 0)
                {
                    _builder.AppendLine();
                    _builder.Append(' ', _intent);
                }

                var leadingSpaces = Regex.Match(line, "^ *").Value.Length;
                _builder.Append(' ', leadingSpaces);
                _builder.Append("'");
                _builder.Append(line.Substring(leadingSpaces));
                _builder.Append("'");
            }
        }

        public void Finish(SourceProductionContext context, CsvRecordModel model)
        {
            if (_builder.Length == 0)
            {
                context.ReportDiagnostic(Diagnostic.Create(
                    new DiagnosticDescriptor(
                        id: DiagnosticIds.NoKustoPartitioningKeyDefined,
                        title: $"No {AttributeName} attributes were defined on a type.",
                        messageFormat: $"No {AttributeName} attributes were defined on a type.",
                        Constants.Category,
                        DiagnosticSeverity.Error,
                        isEnabledByDefault: true),
                    model.Locations.FirstOrDefault() ?? Location.None));
            }
        }

        public string GetResult()
        {
            return _builder.ToString();
        }

        private class PartitioningPolicy
        {
            public List<PartitionKey> PartitionKeys { get; set; }
        }

        private class PartitionKey
        {
            public string ColumnName { get; set; }
            public string Kind { get; set; }
            public PartitionKeyProperties Properties { get; set; }
        }

        private class PartitionKeyProperties
        {
            public string Function { get; set; }
            public int MaxPartitionCount { get; set; }
        }
    }
}