323 lines
14 KiB
C#
323 lines
14 KiB
C#
// Copyright 2016-2019, Pulumi Corporation
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using System;
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using System.Collections.Immutable;
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using System.Linq;
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using System.Reflection;
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using Google.Protobuf.WellKnownTypes;
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namespace Pulumi.Serialization
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{
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internal static class Converter
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{
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public static OutputData<T> ConvertValue<T>(string context, Value value)
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{
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var (data, isKnown, isSecret) = ConvertValue(context, value, typeof(T));
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return new OutputData<T>((T)data!, isKnown, isSecret);
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}
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public static OutputData<object?> ConvertValue(string context, Value value, System.Type targetType)
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{
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CheckTargetType(context, targetType);
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var (deserialized, isKnown, isSecret) = Deserializer.Deserialize(value);
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var converted = ConvertObject(context, deserialized, targetType);
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return new OutputData<object?>(converted, isKnown, isSecret);
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}
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private static object? ConvertObject(string context, object? val, System.Type targetType)
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{
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var (result, exception) = TryConvertObject(context, val, targetType);
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if (exception != null)
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throw exception;
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return result;
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}
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private static (object?, InvalidOperationException?) TryConvertObject(string context, object? val, System.Type targetType)
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{
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var targetIsNullable = targetType.IsGenericType && targetType.GetGenericTypeDefinition() == typeof(Nullable<>);
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// Note: 'null's can enter the system as the representation of an 'unknown' value.
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// Before calling 'Convert' we will have already lifted the 'IsKnown' bit out, but we
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// will be passing null around as a value.
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if (val == null)
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{
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if (targetIsNullable)
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{
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// A 'null' value coerces to a nullable null.
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return (null, null);
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}
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if (targetType.IsValueType)
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{
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return (Activator.CreateInstance(targetType), null);
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}
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// for all other types, can just return the null value right back out as a legal
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// reference type value.
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return (null, null);
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}
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// We're not null and we're converting to Nullable<T>, just convert our value to be a T.
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if (targetIsNullable)
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return TryConvertObject(context, val, targetType.GenericTypeArguments.Single());
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if (targetType == typeof(string))
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return TryEnsureType<string>(context, val);
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if (targetType == typeof(bool))
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return TryEnsureType<bool>(context, val);
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if (targetType == typeof(double))
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return TryEnsureType<double>(context, val);
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if (targetType == typeof(int))
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{
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var (d, exception) = TryEnsureType<double>(context, val);
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if (exception != null)
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return (null, exception);
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return ((int)d, exception);
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}
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if (targetType == typeof(Asset))
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return TryEnsureType<Asset>(context, val);
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if (targetType == typeof(Archive))
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return TryEnsureType<Archive>(context, val);
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if (targetType == typeof(AssetOrArchive))
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return TryEnsureType<AssetOrArchive>(context, val);
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if (targetType.IsConstructedGenericType)
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{
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if (targetType.GetGenericTypeDefinition() == typeof(Union<,>))
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return TryConvertOneOf(context, val, targetType);
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if (targetType.GetGenericTypeDefinition() == typeof(ImmutableArray<>))
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return TryConvertArray(context, val, targetType);
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if (targetType.GetGenericTypeDefinition() == typeof(ImmutableDictionary<,>))
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return TryConvertDictionary(context, val, targetType);
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throw new InvalidOperationException(
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$"Unexpected generic target type {targetType.FullName} when deserializing {context}");
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}
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if (targetType.GetCustomAttribute<OutputTypeAttribute>() == null)
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return (null, new InvalidOperationException(
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$"Unexpected target type {targetType.FullName} when deserializing {context}"));
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var constructor = GetPropertyConstructor(targetType);
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if (constructor == null)
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return (null, new InvalidOperationException(
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$"Expected target type {targetType.FullName} to have [{nameof(OutputConstructorAttribute)}] constructor when deserializing {context}"));
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var (dictionary, tempException) = TryEnsureType<ImmutableDictionary<string, object>>(context, val);
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if (tempException != null)
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return (null, tempException);
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var constructorParameters = constructor.GetParameters();
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var arguments = new object?[constructorParameters.Length];
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for (int i = 0, n = constructorParameters.Length; i < n; i++)
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{
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var parameter = constructorParameters[i];
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// Note: TryGetValue may not find a value here. That can happen for things like
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// unknown vals. That's ok. We'll pass that through to 'Convert' and will get the
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// default value needed for the parameter type.
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dictionary!.TryGetValue(parameter.Name!, out var argValue);
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var (temp, tempException1) = TryConvertObject($"{targetType.FullName}({parameter.Name})", argValue, parameter.ParameterType);
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if (tempException1 != null)
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return (null, tempException1);
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arguments[i] = temp;
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}
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return (constructor.Invoke(arguments), null);
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}
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private static (T, InvalidOperationException?) TryEnsureType<T>(string context, object val)
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=> val is T t ? (t, null) : (default(T)!, new InvalidOperationException($"Expected {typeof(T).FullName} but got {val.GetType().FullName} deserializing {context}"));
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private static (object?, InvalidOperationException?) TryConvertOneOf(string context, object val, System.Type oneOfType)
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{
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var firstType = oneOfType.GenericTypeArguments[0];
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var secondType = oneOfType.GenericTypeArguments[1];
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var (val1, exception1) = TryConvertObject($"{context}.AsT0", val, firstType);
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if (exception1 == null)
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{
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var fromT0Method = oneOfType.GetMethod(nameof(Union<int, int>.FromT0), BindingFlags.Public | BindingFlags.Static);
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return (fromT0Method.Invoke(null, new[] { val1 }), null);
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}
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var (val2, exception2) = TryConvertObject($"{context}.AsT1", val, secondType);
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if (exception2 == null)
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{
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var fromT1Method = oneOfType.GetMethod(nameof(Union<int, int>.FromT1), BindingFlags.Public | BindingFlags.Static);
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return (fromT1Method.Invoke(null, new[] { val2 }), null);
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}
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return (null, new InvalidOperationException($"Expected {firstType.FullName} or {secondType.FullName} but got {val.GetType().FullName} deserializing {context}"));
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}
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private static (object?, InvalidOperationException?) TryConvertArray(
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string fieldName, object val, System.Type targetType)
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{
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if (!(val is ImmutableArray<object> array))
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return (null, new InvalidOperationException(
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$"Expected {typeof(ImmutableArray<object>).FullName} but got {val.GetType().FullName} deserializing {fieldName}"));
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var builder =
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typeof(ImmutableArray).GetMethod(nameof(ImmutableArray.CreateBuilder), Array.Empty<System.Type>())!
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.MakeGenericMethod(targetType.GenericTypeArguments)
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.Invoke(obj: null, parameters: null)!;
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var builderAdd = builder.GetType().GetMethod(nameof(ImmutableArray<int>.Builder.Add))!;
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var builderToImmutable = builder.GetType().GetMethod(nameof(ImmutableArray<int>.Builder.ToImmutable))!;
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var elementType = targetType.GenericTypeArguments.Single();
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foreach (var element in array)
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{
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var (e, exception) = TryConvertObject(fieldName, element, elementType);
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if (exception != null)
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return (null, exception);
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builderAdd.Invoke(builder, new[] { e });
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}
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return (builderToImmutable.Invoke(builder, null), null);
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}
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private static (object?, InvalidOperationException?) TryConvertDictionary(
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string fieldName, object val, System.Type targetType)
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{
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if (!(val is ImmutableDictionary<string, object> dictionary))
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return (null, new InvalidOperationException(
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$"Expected {typeof(ImmutableDictionary<string, object>).FullName} but got {val.GetType().FullName} deserializing {fieldName}"));
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// check if already in the form we need. no need to convert anything.
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if (targetType == typeof(ImmutableDictionary<string, object>))
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return (val, null);
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var keyType = targetType.GenericTypeArguments[0];
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if (keyType != typeof(string))
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return (null, new InvalidOperationException(
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$"Unexpected type {targetType.FullName} when deserializing {fieldName}. ImmutableDictionary's TKey type was not {typeof(string).FullName}"));
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var builder =
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typeof(ImmutableDictionary).GetMethod(nameof(ImmutableDictionary.CreateBuilder), Array.Empty<System.Type>())!
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.MakeGenericMethod(targetType.GenericTypeArguments)
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.Invoke(obj: null, parameters: null)!;
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// var b = ImmutableDictionary.CreateBuilder<string, object>().Add()
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var builderAdd = builder.GetType().GetMethod(nameof(ImmutableDictionary<string, object>.Builder.Add), targetType.GenericTypeArguments)!;
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var builderToImmutable = builder.GetType().GetMethod(nameof(ImmutableDictionary<string, object>.Builder.ToImmutable))!;
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var elementType = targetType.GenericTypeArguments[1];
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foreach (var (key, element) in dictionary)
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{
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var (e, exception) = TryConvertObject(fieldName, element, elementType);
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if (exception != null)
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return (null, exception);
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builderAdd.Invoke(builder, new[] { key, e });
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}
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return (builderToImmutable.Invoke(builder, null), null);
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}
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public static void CheckTargetType(string context, System.Type targetType)
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{
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if (targetType == typeof(bool) ||
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targetType == typeof(int) ||
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targetType == typeof(double) ||
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targetType == typeof(string) ||
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targetType == typeof(Asset) ||
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targetType == typeof(Archive) ||
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targetType == typeof(AssetOrArchive))
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{
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return;
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}
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if (targetType == typeof(ImmutableDictionary<string, object>))
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{
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// This type is what is generated for things like azure/aws tags. It's an untyped
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// map in our original schema. This is the only place that `object` should appear
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// as a legal value.
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return;
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}
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if (targetType.IsConstructedGenericType)
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{
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if (targetType.GetGenericTypeDefinition() == typeof(Nullable<>))
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{
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CheckTargetType(context, targetType.GenericTypeArguments.Single());
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return;
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}
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else if (targetType.GetGenericTypeDefinition() == typeof(Union<,>))
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{
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CheckTargetType(context, targetType.GenericTypeArguments[0]);
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CheckTargetType(context, targetType.GenericTypeArguments[1]);
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return;
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}
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else if (targetType.GetGenericTypeDefinition() == typeof(ImmutableArray<>))
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{
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CheckTargetType(context, targetType.GenericTypeArguments.Single());
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return;
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}
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else if (targetType.GetGenericTypeDefinition() == typeof(ImmutableDictionary<,>))
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{
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var dictTypeArgs = targetType.GenericTypeArguments;
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if (dictTypeArgs[0] != typeof(string))
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{
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throw new InvalidOperationException(
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$@"{context} contains invalid type {targetType.FullName}:
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The only allowed ImmutableDictionary 'TKey' type is 'String'.");
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}
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CheckTargetType(context, dictTypeArgs[1]);
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return;
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}
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else
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{
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throw new InvalidOperationException(
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$@"{context} contains invalid type {targetType.FullName}:
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The only generic types allowed are ImmutableArray<...> and ImmutableDictionary<string, ...>");
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}
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}
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var propertyTypeAttribute = targetType.GetCustomAttribute<OutputTypeAttribute>();
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if (propertyTypeAttribute == null)
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{
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throw new InvalidOperationException(
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$@"{context} contains invalid type {targetType.FullName}. Allowed types are:
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String, Boolean, Int32, Double,
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Nullable<...>, ImmutableArray<...> and ImmutableDictionary<string, ...> or
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a class explicitly marked with the [{nameof(OutputTypeAttribute)}].");
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}
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var constructor = GetPropertyConstructor(targetType);
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if (constructor == null)
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{
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throw new InvalidOperationException(
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$@"{targetType.FullName} had [{nameof(OutputTypeAttribute)}], but did not contain constructor marked with [{nameof(OutputConstructorAttribute)}].");
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}
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foreach (var param in constructor.GetParameters())
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{
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CheckTargetType($@"{targetType.FullName}({param.Name})", param.ParameterType);
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}
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}
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private static ConstructorInfo GetPropertyConstructor(System.Type outputTypeArg)
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=> outputTypeArg.GetConstructors(BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Instance).FirstOrDefault(
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c => c.GetCustomAttributes<OutputConstructorAttribute>() != null);
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}
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}
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