/// <summary>
/// Takes in an arbitrary object and serializes it into a uniform form that can converted
/// trivially to a protobuf to be passed to the Pulumi engine.
/// <para/>
/// The allowed 'basis' forms that can be serialized are:
/// <list type="number">
/// <item><see langword="null"/>s</item>
/// <item><see cref="bool"/>s</item>
/// <item><see cref="int"/>s</item>
/// <item><see cref="double"/>s</item>
/// <item><see cref="string"/>s</item>
/// <item><see cref="Asset"/>s</item>
/// <item><see cref="Archive"/>s</item>
/// <item><see cref="Resource"/>s</item>
/// <item><see cref="ResourceArgs"/></item>
/// <item><see cref="JsonElement"/></item>
/// </list>
/// Additionally, other more complex objects can be serialized as long as they are built
/// out of serializable objects. These complex objects include:
/// <list type="number">
/// <item><see cref="Input{T}"/>s. As long as they are an Input of a serializable type.</item>
/// <item><see cref="Output{T}"/>s. As long as they are an Output of a serializable type.</item>
/// <item><see cref="IList"/>s. As long as all elements in the list are serializable.</item>
/// <item><see cref="IDictionary"/>. As long as the key of the dictionary are <see cref="string"/>s and as long as the value are all serializable.</item>
/// </list>
/// No other forms are allowed.
/// <para/>
/// This function will only return values of a very specific shape. Specifically, the
/// result values returned will *only* be one of:
/// <para/>
/// <list type="number">
/// <item><see langword="null"/></item>
/// <item><see cref="bool"/></item>
/// <item><see cref="int"/></item>
/// <item><see cref="double"/></item>
/// <item><see cref="string"/></item>
/// <item>An <see cref="ImmutableArray{T}"/> containing only these result value types.</item>
/// <item>An <see cref="IImmutableDictionary{TKey, TValue}"/> where the keys are strings and
/// the values are only these result value types.</item>
/// </list>
/// No other result type are allowed to be returned.
/// </summary>
public async Task <object?> SerializeAsync(string ctx, object?prop, bool keepResources, bool keepOutputValues = false)
{
// IMPORTANT:
// IMPORTANT: Keep this in sync with serializesPropertiesSync in invoke.ts
// IMPORTANT:
if (prop == null ||
prop is bool ||
prop is int ||
prop is double ||
prop is string)
{
if (_excessiveDebugOutput)
{
Log.Debug($"Serialize property[{ctx}]: primitive={prop}");
}
return(prop);
}
if (prop is InputArgs args)
{
return(await SerializeInputArgsAsync(ctx, args, keepResources, keepOutputValues).ConfigureAwait(false));
}
if (prop is AssetOrArchive assetOrArchive)
{
// There's no need to pass keepOutputValues when serializing assets or archives.
return(await SerializeAssetOrArchiveAsync(ctx, assetOrArchive, keepResources).ConfigureAwait(false));
}
if (prop is Task)
{
throw new InvalidOperationException(
$"Tasks are not allowed inside ResourceArgs. Please wrap your Task in an Output:\n\t{ctx}");
}
if (prop is IInput input)
{
if (_excessiveDebugOutput)
{
Log.Debug($"Serialize property[{ctx}]: Recursing into IInput");
}
return(await SerializeAsync(ctx, input.ToOutput(), keepResources, keepOutputValues).ConfigureAwait(false));
}
if (prop is IUnion union)
{
if (_excessiveDebugOutput)
{
Log.Debug($"Serialize property[{ctx}]: Recursing into IUnion");
}
return(await SerializeAsync(ctx, union.Value, keepResources, keepOutputValues).ConfigureAwait(false));
}
if (prop is JsonElement element)
{
if (_excessiveDebugOutput)
{
Log.Debug($"Serialize property[{ctx}]: Recursing into Json");
}
return(SerializeJson(ctx, element));
}
if (prop is IOutput output)
{
if (_excessiveDebugOutput)
{
Log.Debug($"Serialize property[{ctx}]: Recursing into Output");
}
var data = await output.GetDataAsync().ConfigureAwait(false);
DependentResources.AddRange(data.Resources);
var propResources = new HashSet <Resource>(data.Resources);
// When serializing an Output, we will either serialize it as its resolved value or the "unknown value"
// sentinel. We will do the former for all outputs created directly by user code (such outputs always
// resolve isKnown to true) and for any resource outputs that were resolved with known values.
var isKnown = data.IsKnown;
var isSecret = data.IsSecret;
var valueSerializer = new Serializer(_excessiveDebugOutput);
// It is unsafe to serialize unknown values.
object?value = isKnown
? await valueSerializer.SerializeAsync(
$"{ctx}.id", data.Value, keepResources, keepOutputValues : false).ConfigureAwait(false)
: null;
var promiseDeps = valueSerializer.DependentResources;
DependentResources.UnionWith(promiseDeps);
propResources.UnionWith(promiseDeps);
if (keepOutputValues)
{
if (isKnown && !isSecret && propResources.Count == 0)
{
return(value);
}
var urnDeps = new HashSet <Resource>();
foreach (var resource in propResources)
{
var urnSerializer = new Serializer(_excessiveDebugOutput);
await urnSerializer.SerializeAsync($"{ctx} dependency", resource.Urn, keepResources, keepOutputValues : false).ConfigureAwait(false);
urnDeps.UnionWith(urnSerializer.DependentResources);
}
DependentResources.UnionWith(urnDeps);
propResources.UnionWith(urnDeps);
var dependencies = await Deployment.GetAllTransitivelyReferencedResourceUrnsAsync(propResources).ConfigureAwait(false);
var builder = ImmutableDictionary.CreateBuilder <string, object?>();
builder.Add(Constants.SpecialSigKey, Constants.SpecialOutputValueSig);
if (isKnown)
{
builder.Add(Constants.ValueName, value);
}
if (isSecret)
{
builder.Add(Constants.SecretName, isSecret);
}
if (dependencies.Count > 0)
{
builder.Add(Constants.DependenciesName,
dependencies.OrderBy(x => x, StringComparer.Ordinal).ToImmutableArray <object>());
}
return(builder.ToImmutable());
}
if (!isKnown)
{
return(Constants.UnknownValue);
}
if (isSecret)
{
var builder = ImmutableDictionary.CreateBuilder <string, object?>();
builder.Add(Constants.SpecialSigKey, Constants.SpecialSecretSig);
builder.Add(Constants.ValueName, value);
return(builder.ToImmutable());
}
return(value);
}
if (prop is CustomResource customResource)
{
// Resources aren't serializable; instead, we serialize them as references to the ID property.
if (_excessiveDebugOutput)
{
Log.Debug($"Serialize property[{ctx}]: Encountered CustomResource");
}
DependentResources.Add(customResource);
var id = await SerializeAsync($"{ctx}.id", customResource.Id, keepResources, keepOutputValues : false).ConfigureAwait(false);
if (keepResources)
{
var urn = await SerializeAsync($"{ctx}.urn", customResource.Urn, keepResources, keepOutputValues : false).ConfigureAwait(false);
var builder = ImmutableDictionary.CreateBuilder <string, object?>();
builder.Add(Constants.SpecialSigKey, Constants.SpecialResourceSig);
builder.Add(Constants.ResourceUrnName, urn);
builder.Add(Constants.ResourceIdName, id as string == Constants.UnknownValue ? "" : id);
return(builder.ToImmutable());
}
return(id);
}
if (prop is ComponentResource componentResource)
{
// Component resources often can contain cycles in them. For example, an awsinfra
// SecurityGroupRule can point a the awsinfra SecurityGroup, which in turn can point
// back to its rules through its 'egressRules' and 'ingressRules' properties. If
// serializing out the 'SecurityGroup' resource ends up trying to serialize out
// those properties, a deadlock will happen, due to waiting on the child, which is
// waiting on the parent.
//
// Practically, there is no need to actually serialize out a component. It doesn't
// represent a real resource, nor does it have normal properties that need to be
// tracked for differences (since changes to its properties don't represent changes
// to resources in the real world).
//
// So, to avoid these problems, while allowing a flexible and simple programming
// model, we just serialize out the component as its urn. This allows the component
// to be identified and tracked in a reasonable manner, while not causing us to
// compute or embed information about it that is not needed, and which can lead to
// deadlocks.
if (_excessiveDebugOutput)
{
Log.Debug($"Serialize property[{ctx}]: Encountered ComponentResource");
}
var urn = await SerializeAsync($"{ctx}.urn", componentResource.Urn, keepResources, keepOutputValues : false).ConfigureAwait(false);
if (keepResources)
{
var builder = ImmutableDictionary.CreateBuilder <string, object?>();
builder.Add(Constants.SpecialSigKey, Constants.SpecialResourceSig);
builder.Add(Constants.ResourceUrnName, urn);
return(builder.ToImmutable());
}
return(urn);
}
if (prop is IDictionary dictionary)
{
return(await SerializeDictionaryAsync(ctx, dictionary, keepResources, keepOutputValues).ConfigureAwait(false));
}
if (prop is IList list)
{
return(await SerializeListAsync(ctx, list, keepResources, keepOutputValues).ConfigureAwait(false));
}
if (prop is Enum e && e.GetTypeCode() == TypeCode.Int32)
{
return((int)prop);
}
var propType = prop.GetType();
if (propType.IsValueType && propType.GetCustomAttribute <EnumTypeAttribute>() != null)
{
var mi = propType.GetMethod("op_Explicit", BindingFlags.Public | BindingFlags.Static, null, new[] { propType }, null);
if (mi == null || (mi.ReturnType != typeof(string) && mi.ReturnType != typeof(double)))
{
throw new InvalidOperationException($"Expected {propType.FullName} to have an explicit conversion operator to String or Double.\n\t{ctx}");
}
return(mi.Invoke(null, new[] { prop }));
}
throw new InvalidOperationException($"{propType.FullName} is not a supported argument type.\n\t{ctx}");
}
