public ExecutionContext BuildExecutionContext(
Schema schema,
object root,
Document document,
string operationName,
Inputs inputs)
{
var context = new ExecutionContext();
context.Schema = schema;
context.RootObject = root;
var operation = !string.IsNullOrWhiteSpace(operationName)
? document.Operations.WithName(operationName)
: document.Operations.FirstOrDefault();
if (operation == null)
{
context.Errors.Add(new ExecutionError("Unknown operation name: {0}".ToFormat(operationName)));
return context;
}
context.Operation = operation;
context.Variables = GetVariableValues(schema, operation.Variables, inputs);
context.Fragments = document.Fragments;
return context;
}
public Task <object> ExecuteOperation(ExecutionContext context)
{
var rootType = GetOperationRootType(context.Schema, context.Operation);
var fields = CollectFields(
context,
rootType,
context.Operation.Selections,
new Dictionary <string, Fields>(),
new List <string>());
return(ExecuteFields(context, rootType, context.RootValue, fields));
}
public Task <Dictionary <string, object> > ExecuteOperationAsync(ExecutionContext context)
{
var rootType = GetOperationRootType(context.Document, context.Schema, context.Operation);
var fields = CollectFields(
context,
rootType,
context.Operation.SelectionSet,
new Dictionary <string, Field>(),
new List <string>());
return(ExecuteFieldsAsync(context, rootType, context.RootValue, fields, new string[0]));
}
private IDictionary <string, Field> SubFieldsFor(ExecutionContext context, IGraphType fieldType, Field field)
{
if (!(fieldType is IObjectGraphType) || !field.SelectionSet.Selections.Any())
{
return(null);
}
var subFields = new Dictionary <string, Field>();
var visitedFragments = new List <string>();
var fields = CollectFields(context, fieldType, field.SelectionSet, subFields, visitedFragments);
return(fields);
}
private ResolveFieldResult <object> GenerateError(
ResolveFieldResult <object> resolveResult,
Field field,
ExecutionContext context,
Exception exc,
IEnumerable <string> path)
{
var error = new ExecutionError("Error trying to resolve {0}.".ToFormat(field.Name), exc);
error.AddLocation(field, context.Document);
error.Path = path;
context.Errors.Add(error);
resolveResult.Skip = false;
return(resolveResult);
}
public async Task <IDictionary <string, object> > ExecuteFieldsAsync(ExecutionContext context, IObjectGraphType rootType, object source, Dictionary <string, Field> fields, IEnumerable <string> path)
{
var data = new ConcurrentDictionary <string, object>();
var externalTasks = new List <Task>();
foreach (var fieldCollection in fields)
{
var currentPath = path.Concat(new[] { fieldCollection.Key });
var field = fieldCollection.Value;
var fieldType = GetFieldDefinition(context.Document, context.Schema, rootType, field);
if (fieldType?.Resolver == null || !fieldType.Resolver.RunThreaded() || context.Operation.OperationType == OperationType.Mutation || fields.Count == 1)
{
await ExtractFieldAsync(context, rootType, source, field, fieldType, data, currentPath)
.ConfigureAwait(false);
}
else
{
var task = Task.Run(() => ExtractFieldAsync(context, rootType, source, field, fieldType, data, currentPath), context.CancellationToken);
externalTasks.Add(task);
}
}
if (externalTasks.Count > 0)
{
await Task.WhenAll(externalTasks)
.ConfigureAwait(false);
}
var ordered = new Dictionary <string, object>();
foreach (var fieldCollection in fields)
{
var name = fieldCollection.Key;
if (!data.ContainsKey(name))
{
continue;
}
ordered.Add(name, data[name]);
}
return(ordered);
}
protected override IExecutionStrategy SelectExecutionStrategy(ExecutionContext context)
{
switch (context.Operation.OperationType)
{
case OperationType.Query:
return(new ParallelExecutionWithAuthorizationStrategy());
case OperationType.Mutation:
return(new SerialExecutionWithAuthorizationStrategy());
case OperationType.Subscription:
return(new SubscriptionExecutionStrategy());
default:
throw new InvalidOperationException($"Unexpected OperationType {context.Operation.OperationType}");
}
}
protected virtual IExecutionStrategy SelectExecutionStrategy(ExecutionContext context)
{
// TODO: Should we use cached instances of the default execution strategies?
switch (context.Operation.OperationType)
{
case OperationType.Query:
return(new ParallelExecutionStrategy());
case OperationType.Mutation:
return(new SerialExecutionStrategy());
case OperationType.Subscription:
return(new SubscriptionExecutionStrategy());
default:
throw new InvalidOperationException($"Unexpected OperationType {context.Operation.OperationType}");
}
}
/// <summary>
/// Resolve simple fields in a performant manor
/// </summary>
private static async Task <object> ResolveFieldFromDataAsync(ExecutionContext context, IObjectGraphType rootType, object source,
FieldType fieldType, Field field, IEnumerable <string> path)
{
object result = null;
try
{
if (fieldType.Resolver != null)
{
var rfc = new ResolveFieldContext(context, field, fieldType, source, rootType, null, path);
result = fieldType.Resolver.Resolve(rfc);
result = await UnwrapResultAsync(result)
.ConfigureAwait(false);
}
else
{
result = NameFieldResolver.Resolve(source, field.Name);
}
if (result != null)
{
var scalarType = fieldType.ResolvedType as ScalarGraphType;
result = scalarType?.Serialize(result);
}
}
catch (Exception exc)
{
var error = new ExecutionError($"Error trying to resolve {field.Name}.", exc);
error.AddLocation(field, context.Document);
error.Path = path.ToList();
context.Errors.Add(error);
// If there was an exception, the value of result cannot be trusted
result = null;
}
return(result);
}
/// <summary>
/// Resolve lists in a performant manor
/// </summary>
private async Task <List <object> > ResolveListFromData(ExecutionContext context, object source, IObjectGraphType parentType,
IGraphType graphType, Field field, IEnumerable <string> path)
{
var result = new List <object>();
var listInfo = graphType as ListGraphType;
var subType = listInfo?.ResolvedType as IObjectGraphType;
var data = source as IEnumerable;
var visitedFragments = new List <string>();
var subFields = CollectFields(context, subType, field.SelectionSet, null, visitedFragments);
if (data == null)
{
var error = new ExecutionError("User error: expected an IEnumerable list though did not find one.");
error.AddLocation(field, context.Document);
throw error;
}
var index = 0;
foreach (var node in data)
{
var currentPath = path.Concat(new[] { $"{index++}" });
if (subType != null)
{
var nodeResult = await ExecuteFieldsAsync(context, subType, node, subFields, currentPath)
.ConfigureAwait(false);
result.Add(nodeResult);
}
else
{
var nodeResult = await CompleteValueAsync(context, parentType, listInfo?.ResolvedType, field, node, currentPath)
.ConfigureAwait(false);
result.Add(nodeResult);
}
}
return(result);
}
public bool ShouldIncludeNode(ExecutionContext context, Directives directives)
{
if (directives != null)
{
var directive = directives.Find(DirectiveGraphType.Skip.Name);
if (directive != null)
{
var values = GetArgumentValues(
context.Schema,
DirectiveGraphType.Skip.Arguments,
directive.Arguments,
context.Variables);
object ifObj;
values.TryGetValue("if", out ifObj);
bool ifVal;
return(!(bool.TryParse(ifObj?.ToString() ?? string.Empty, out ifVal) && ifVal));
}
directive = directives.Find(DirectiveGraphType.Include.Name);
if (directive != null)
{
var values = GetArgumentValues(
context.Schema,
DirectiveGraphType.Include.Arguments,
directive.Arguments,
context.Variables);
object ifObj;
values.TryGetValue("if", out ifObj);
bool ifVal;
return(bool.TryParse(ifObj?.ToString() ?? string.Empty, out ifVal) && ifVal);
}
}
return(true);
}
public bool DoesFragmentConditionMatch(ExecutionContext context, IHaveFragmentType fragment, GraphType type)
{
var conditionalType = context.Schema.FindType(fragment.Type);
if (conditionalType == type)
{
return(true);
}
if (conditionalType is InterfaceGraphType)
{
var interfaceType = (InterfaceGraphType)conditionalType;
var hasInterfaces = type as IImplementInterfaces;
if (hasInterfaces != null)
{
var interfaces = context.Schema.FindTypes(hasInterfaces.Interfaces);
return(interfaceType.IsPossibleType(interfaces));
}
}
return(false);
}
private ExecutionContext BuildExecutionContext(
ISchema schema,
object root,
Document document,
Operation operation,
Inputs inputs,
IDictionary <string, object> userContext,
CancellationToken cancellationToken,
Metrics metrics,
List <IDocumentExecutionListener> listeners,
bool throwOnUnhandledException,
Action <UnhandledExceptionContext> unhandledExceptionDelegate,
int?maxParallelExecutionCount,
IServiceProvider requestServices)
{
var context = new ExecutionContext
{
Document = document,
Schema = schema,
RootValue = root,
UserContext = userContext,
Operation = operation,
Variables = inputs == null ? null : GetVariableValues(document, schema, operation?.Variables, inputs),
Fragments = document.Fragments,
Errors = new ExecutionErrors(),
Extensions = new Dictionary <string, object>(),
CancellationToken = cancellationToken,
Metrics = metrics,
Listeners = listeners,
ThrowOnUnhandledException = throwOnUnhandledException,
UnhandledExceptionDelegate = unhandledExceptionDelegate,
MaxParallelExecutionCount = maxParallelExecutionCount,
RequestServices = requestServices
};
return(context);
}
private async Task ExtractFieldAsync(ExecutionContext context, IObjectGraphType rootType, object source,
Field field, FieldType fieldType, ConcurrentDictionary <string, object> data, IEnumerable <string> path)
{
context.CancellationToken.ThrowIfCancellationRequested();
var name = field.Alias ?? field.Name;
if (data.ContainsKey(name))
{
return;
}
if (!ShouldIncludeNode(context, field.Directives))
{
return;
}
if (CanResolveFromData(field, fieldType))
{
var result = await ResolveFieldFromDataAsync(context, rootType, source, fieldType, field, path)
.ConfigureAwait(false);
data.TryAdd(name, result);
}
else
{
var result = await ResolveFieldAsync(context, rootType, source, field, path)
.ConfigureAwait(false);
if (result.Skip)
{
return;
}
data.TryAdd(name, result.Value);
}
}
public async Task <object> CompleteValueAsync(ExecutionContext context, IGraphType fieldType, Fields fields, object result)
{
var field = fields != null?fields.FirstOrDefault() : null;
var fieldName = field != null ? field.Name : null;
var nonNullType = fieldType as NonNullGraphType;
if (nonNullType != null)
{
var type = nonNullType.ResolvedType;
var completed = await CompleteValueAsync(context, type, fields, result).ConfigureAwait(false);
if (completed == null)
{
var error = new ExecutionError("Cannot return null for non-null type. Field: {0}, Type: {1}!."
.ToFormat(fieldName, type.Name));
error.AddLocation(field, context.Document);
throw error;
}
return(completed);
}
if (result == null)
{
return(null);
}
if (fieldType is ScalarGraphType)
{
var scalarType = fieldType as ScalarGraphType;
var coercedValue = scalarType.Serialize(result);
return(coercedValue);
}
if (fieldType is ListGraphType)
{
var list = result as IEnumerable;
if (list == null)
{
var error = new ExecutionError("User error: expected an IEnumerable list though did not find one.");
error.AddLocation(field, context.Document);
throw error;
}
var listType = fieldType as ListGraphType;
var itemType = listType.ResolvedType;
var results = await list.MapAsync(async item => await CompleteValueAsync(context, itemType, fields, item).ConfigureAwait(false)).ConfigureAwait(false);
return(results);
}
var objectType = fieldType as IObjectGraphType;
if (fieldType is IAbstractGraphType)
{
var abstractType = fieldType as IAbstractGraphType;
objectType = abstractType.GetObjectType(result);
if (objectType != null && !abstractType.IsPossibleType(objectType))
{
var error = new ExecutionError(
"Runtime Object type \"{0}\" is not a possible type for \"{1}\""
.ToFormat(objectType, abstractType));
error.AddLocation(field, context.Document);
throw error;
}
}
if (objectType == null)
{
return(null);
}
if (objectType.IsTypeOf != null && !objectType.IsTypeOf(result))
{
var error = new ExecutionError(
"Expected value of type \"{0}\" but got: {1}."
.ToFormat(objectType, result));
error.AddLocation(field, context.Document);
throw error;
}
var subFields = new Dictionary <string, Fields>();
var visitedFragments = new List <string>();
fields.Apply(f =>
{
subFields = CollectFields(context, objectType, f.SelectionSet, subFields, visitedFragments);
});
return(await ExecuteFieldsAsync(context, objectType, result, subFields).ConfigureAwait(false));
}
public async Task <object> ExecuteFields(ExecutionContext context, ObjectGraphType rootType, object source, Dictionary <string, Fields> fields)
{
return(await fields.ToDictionaryAsync(
pair => pair.Key,
pair => ResolveField(context, rootType, source, pair.Value)));
}
public bool DoesFragmentConditionMatch(ExecutionContext context, IHaveFragmentType fragment, GraphType type)
{
var conditionalType = context.Schema.FindType(fragment.Type);
if (conditionalType == type)
{
return true;
}
if (conditionalType is InterfaceGraphType)
{
return ((InterfaceGraphType)conditionalType).IsPossibleType(type as IImplementInterfaces);
}
return false;
}
/// <summary>
/// Processes data from the source stream via <see cref="IObserver{T}.OnNext(T)"/> and
/// returns an <see cref="ExecutionResult"/>.
/// <br/><br/>
/// Executes with a scoped service provider in <see cref="ExecutionContext.RequestServices"/>
/// which is disposed once this method completes.
/// </summary>
protected override async ValueTask <ExecutionResult> ProcessDataAsync(ExecutionContext context, ExecutionNode node, object?value)
{
using var scope = _serviceScopeFactory.CreateScope();
context.RequestServices = scope.ServiceProvider;
return(await base.ProcessDataAsync(context, node, value).ConfigureAwait(false));
}
private ResolveFieldResult<object> GenerateError(ResolveFieldResult<object> resolveResult, Field field, ExecutionContext context, Exception exc)
{
var error = new ExecutionError("Error trying to resolve {0}.".ToFormat(field.Name), exc);
error.AddLocation(field, context.Document);
context.Errors.Add(error);
resolveResult.Skip = false;
return resolveResult;
}
public async Task <ResolveFieldResult <object> > ResolveFieldAsync(ExecutionContext context, IObjectGraphType parentType, object source, Field field, IEnumerable <string> path)
{
context.CancellationToken.ThrowIfCancellationRequested();
var fieldPath = path?.ToList() ?? new List <string>();
var resolveResult = new ResolveFieldResult <object>
{
Skip = false
};
var fieldDefinition = GetFieldDefinition(context.Document, context.Schema, parentType, field);
if (fieldDefinition == null)
{
resolveResult.Skip = true;
return(resolveResult);
}
var arguments = GetArgumentValues(context.Schema, fieldDefinition.Arguments, field.Arguments, context.Variables);
try
{
var resolveContext = new ResolveFieldContext();
resolveContext.FieldName = field.Name;
resolveContext.FieldAst = field;
resolveContext.FieldDefinition = fieldDefinition;
resolveContext.ReturnType = fieldDefinition.ResolvedType;
resolveContext.ParentType = parentType;
resolveContext.Arguments = arguments;
resolveContext.Source = source;
resolveContext.Schema = context.Schema;
resolveContext.Document = context.Document;
resolveContext.Fragments = context.Fragments;
resolveContext.RootValue = context.RootValue;
resolveContext.UserContext = context.UserContext;
resolveContext.Operation = context.Operation;
resolveContext.Variables = context.Variables;
resolveContext.CancellationToken = context.CancellationToken;
resolveContext.Metrics = context.Metrics;
resolveContext.Errors = context.Errors;
resolveContext.Path = fieldPath;
var subFields = SubFieldsFor(context, fieldDefinition.ResolvedType, field);
resolveContext.SubFields = subFields;
var resolver = fieldDefinition.Resolver ?? new NameFieldResolver();
var result = resolver.Resolve(resolveContext);
if (result is Task)
{
var task = result as Task;
if (task.IsFaulted)
{
var aggregateException = task.Exception;
var exception = aggregateException.InnerExceptions.Count == 1
? aggregateException.InnerException
: aggregateException;
return(GenerateError(resolveResult, field, context, exception, fieldPath));
}
await task.ConfigureAwait(false);
result = task.GetProperyValue("Result");
}
resolveResult.Value =
await CompleteValueAsync(context, parentType, fieldDefinition.ResolvedType, field, result, fieldPath).ConfigureAwait(false);
return(resolveResult);
}
catch (Exception exc)
{
return(GenerateError(resolveResult, field, context, exc, path));
}
}
public async Task<object> ExecuteFields(ExecutionContext context, ObjectGraphType rootType, object source, Dictionary<string, Fields> fields)
{
return await fields.ToDictionaryAsync(
pair => pair.Key,
pair => ResolveField(context, rootType, source, pair.Value));
}
/// <summary> /// Returns an instance of an <see cref="IExecutionStrategy"/> given specified execution parameters. /// <br/><br/> /// Typically the strategy is selected based on the type of operation. /// <br/><br/> /// By default, the selection is handled by the <see cref="IExecutionStrategySelector"/> implementation passed to the /// constructor, which will select an execution strategy based on a set of <see cref="ExecutionStrategyRegistration"/> /// instances passed to it. /// <br/><br/> /// For the <see cref="DefaultExecutionStrategySelector"/> without any registrations, /// query operations will return a <see cref="ParallelExecutionStrategy"/> while mutation operations return a /// <see cref="SerialExecutionStrategy"/>. Subscription operations return a <see cref="SubscriptionExecutionStrategy"/>. /// </summary> protected virtual IExecutionStrategy SelectExecutionStrategy(ExecutionContext context) => _executionStrategySelector.Select(context);
public Task<Dictionary<string, object>> ExecuteFieldsAsync(ExecutionContext context, IObjectGraphType rootType, object source, Dictionary<string, Fields> fields)
{
return fields.ToDictionaryAsync<KeyValuePair<string, Fields>, string, ResolveFieldResult<object>, object>(
pair => pair.Key,
pair => ResolveFieldAsync(context, rootType, source, pair.Value));
}
public async Task <ExecutionResult> ExecuteAsync(ExecutionOptions options)
{
if (options == null)
{
throw new ArgumentNullException(nameof(options));
}
if (options.Schema == null)
{
throw new InvalidOperationException("Cannot execute request if no schema is specified");
}
if (options.Query == null)
{
throw new InvalidOperationException("Cannot execute request if no query is specified");
}
if (options.FieldMiddleware == null)
{
throw new InvalidOperationException("Cannot execute request if no middleware builder specified");
}
var metrics = new Metrics(options.EnableMetrics).Start(options.OperationName);
options.Schema.NameConverter = options.NameConverter;
options.Schema.Filter = options.SchemaFilter;
ExecutionResult result = null;
ExecutionContext context = null;
try
{
if (!options.Schema.Initialized)
{
using (metrics.Subject("schema", "Initializing schema"))
{
options.FieldMiddleware.ApplyTo(options.Schema);
options.Schema.Initialize();
}
}
var document = options.Document;
using (metrics.Subject("document", "Building document"))
{
if (document == null)
{
document = _documentBuilder.Build(options.Query);
}
}
if (document.Operations.Count == 0)
{
throw new NoOperationError();
}
var operation = GetOperation(options.OperationName, document);
metrics.SetOperationName(operation?.Name);
if (operation == null)
{
throw new InvalidOperationException($"Query does not contain operation '{options.OperationName}'.");
}
IValidationResult validationResult;
using (metrics.Subject("document", "Validating document"))
{
validationResult = await _documentValidator.ValidateAsync(
options.Query,
options.Schema,
document,
options.ValidationRules,
options.UserContext,
options.Inputs);
}
if (options.ComplexityConfiguration != null && validationResult.IsValid)
{
using (metrics.Subject("document", "Analyzing complexity"))
_complexityAnalyzer.Validate(document, options.ComplexityConfiguration);
}
context = BuildExecutionContext(
options.Schema,
options.Root,
document,
operation,
options.Inputs,
options.UserContext,
options.CancellationToken,
metrics,
options.Listeners,
options.ThrowOnUnhandledException,
options.UnhandledExceptionDelegate,
options.MaxParallelExecutionCount,
options.RequestServices);
foreach (var listener in options.Listeners)
{
await listener.AfterValidationAsync(context, validationResult)
.ConfigureAwait(false);
}
if (!validationResult.IsValid)
{
return(new ExecutionResult
{
Errors = validationResult.Errors,
Perf = metrics.Finish()
});
}
if (context.Errors.Count > 0)
{
return(new ExecutionResult
{
Errors = context.Errors,
Perf = metrics.Finish()
});
}
using (metrics.Subject("execution", "Executing operation"))
{
if (context.Listeners != null)
{
foreach (var listener in context.Listeners)
{
await listener.BeforeExecutionAsync(context)
.ConfigureAwait(false);
}
}
IExecutionStrategy executionStrategy = SelectExecutionStrategy(context);
if (executionStrategy == null)
{
throw new InvalidOperationException("Invalid ExecutionStrategy!");
}
var task = executionStrategy.ExecuteAsync(context)
.ConfigureAwait(false);
if (context.Listeners != null)
{
foreach (var listener in context.Listeners)
{
await listener.BeforeExecutionAwaitedAsync(context)
.ConfigureAwait(false);
}
}
result = await task;
if (context.Listeners != null)
{
foreach (var listener in context.Listeners)
{
await listener.AfterExecutionAsync(context)
.ConfigureAwait(false);
}
}
}
if (context.Errors.Count > 0)
{
result.Errors = context.Errors;
}
}
catch (OperationCanceledException) when(options.CancellationToken.IsCancellationRequested)
{
throw;
}
catch (ExecutionError ex)
{
result = new ExecutionResult
{
Errors = new ExecutionErrors
{
ex
}
};
}
catch (Exception ex)
{
if (options.ThrowOnUnhandledException)
{
throw;
}
UnhandledExceptionContext exceptionContext = null;
if (options.UnhandledExceptionDelegate != null)
{
exceptionContext = new UnhandledExceptionContext(context, null, ex);
options.UnhandledExceptionDelegate(exceptionContext);
ex = exceptionContext.Exception;
}
result = new ExecutionResult
{
Errors = new ExecutionErrors
{
ex is ExecutionError executionError ? executionError : new UnhandledError(exceptionContext?.ErrorMessage ?? "Error executing document.", ex)
}
};
}
finally
{
result ??= new ExecutionResult();
result.Perf = metrics.Finish();
}
return(result);
}
public Task<Dictionary<string, object>> ExecuteOperationAsync(ExecutionContext context)
{
var rootType = GetOperationRootType(context.Document, context.Schema, context.Operation);
var fields = CollectFields(
context,
rootType,
context.Operation.SelectionSet,
new Dictionary<string, Fields>(),
new List<string>());
return ExecuteFieldsAsync(context, rootType, context.RootValue, fields);
}
public ExecutionContext BuildExecutionContext(
ISchema schema,
object root,
Document document,
Operation operation,
Inputs inputs,
object userContext,
CancellationToken cancellationToken,
Metrics metrics)
{
var context = new ExecutionContext();
context.Document = document;
context.Schema = schema;
context.RootValue = root;
context.UserContext = userContext;
context.Operation = operation;
context.Variables = GetVariableValues(document, schema, operation.Variables, inputs);
context.Fragments = document.Fragments;
context.CancellationToken = cancellationToken;
context.Metrics = metrics;
return context;
}
/// <summary>
/// Encapsulates an error within an <see cref="ExecutionResult"/> for errors generated
/// by the event stream via <see cref="IObserver{T}.OnError(Exception)"/>.
/// <br/><br/>
/// Executes with a scoped service provider in <see cref="ExecutionContext.RequestServices"/>
/// which is disposed once this method completes.
/// </summary>
protected override Task <ExecutionError> ProcessErrorAsync(ExecutionContext context, ExecutionNode node, Exception exception)
{
using var scope = _serviceScopeFactory.CreateScope();
context.RequestServices = scope.ServiceProvider;
return(base.ProcessErrorAsync(context, node, exception));
}
public async Task <object> CompleteValue(ExecutionContext context, GraphType fieldType, Fields fields, object result)
{
if (fieldType is NonNullGraphType)
{
var nonNullType = fieldType as NonNullGraphType;
var completed = await CompleteValue(context, context.Schema.FindType(nonNullType.Type), fields, result);
if (completed == null)
{
throw new ExecutionError("Cannot return null for non-null type. Field: {0}".ToFormat(nonNullType.Name));
}
return(completed);
}
if (result == null)
{
return(null);
}
if (fieldType is ScalarGraphType)
{
var scalarType = fieldType as ScalarGraphType;
var coercedValue = scalarType.Coerce(result);
return(coercedValue);
}
if (fieldType is ListGraphType)
{
var list = result as IEnumerable;
if (list == null)
{
throw new ExecutionError("User error: expected an IEnumerable list though did not find one.");
}
var listType = fieldType as ListGraphType;
var itemType = context.Schema.FindType(listType.Type);
var results = await list.MapAsync(async item =>
{
return(await CompleteValue(context, itemType, fields, item));
});
return(results);
}
var objectType = fieldType as ObjectGraphType;
if (fieldType is InterfaceGraphType)
{
var interfaceType = fieldType as InterfaceGraphType;
objectType = interfaceType.ResolveType(result);
}
if (objectType == null)
{
return(null);
}
var subFields = new Dictionary <string, Fields>();
fields.Apply(field =>
{
subFields = CollectFields(context, objectType, field.Selections, subFields);
});
return(await ExecuteFields(context, objectType, result, subFields));
}
public async Task<object> CompleteValue(ExecutionContext context, GraphType fieldType, Fields fields, object result)
{
var nonNullType = fieldType as NonNullGraphType;
if (nonNullType != null)
{
var completed = await CompleteValue(context, context.Schema.FindType(nonNullType.Type), fields, result);
if (completed == null)
{
throw new ExecutionError("Cannot return null for non-null type. Field: {0}".ToFormat(nonNullType.Name));
}
return completed;
}
if (result == null)
{
return null;
}
if (fieldType is ScalarGraphType)
{
var scalarType = fieldType as ScalarGraphType;
var coercedValue = scalarType.Coerce(result);
return coercedValue;
}
if (fieldType is ListGraphType)
{
var list = result as IEnumerable;
if (list == null)
{
throw new ExecutionError("User error: expected an IEnumerable list though did not find one.");
}
var listType = fieldType as ListGraphType;
var itemType = context.Schema.FindType(listType.Type);
var results = await list.MapAsync(async item =>
{
return await CompleteValue(context, itemType, fields, item);
});
return results;
}
var objectType = fieldType as ObjectGraphType;
if (fieldType is InterfaceGraphType)
{
var interfaceType = fieldType as InterfaceGraphType;
objectType = interfaceType.ResolveType(result);
}
if (objectType == null)
{
return null;
}
var subFields = new Dictionary<string, Fields>();
fields.Apply(field =>
{
subFields = CollectFields(context, objectType, field.Selections, subFields);
});
return await ExecuteFields(context, objectType, result, subFields);
}
public async Task <ResolveFieldResult <object> > ResolveFieldAsync(ExecutionContext context, IObjectGraphType parentType, object source, Field field, IEnumerable <string> path)
{
context.CancellationToken.ThrowIfCancellationRequested();
var fieldPath = path?.ToList() ?? new List <string>();
var resolveResult = new ResolveFieldResult <object>
{
Skip = false
};
var fieldDefinition = GetFieldDefinition(context.Document, context.Schema, parentType, field);
if (fieldDefinition == null)
{
resolveResult.Skip = true;
return(resolveResult);
}
var arguments = GetArgumentValues(context.Schema, fieldDefinition.Arguments, field.Arguments, context.Variables);
try
{
var resolveContext = new ResolveFieldContext
{
FieldName = field.Name,
FieldAst = field,
FieldDefinition = fieldDefinition,
ReturnType = fieldDefinition.ResolvedType,
ParentType = parentType,
Arguments = arguments,
Source = source,
Schema = context.Schema,
Document = context.Document,
Fragments = context.Fragments,
RootValue = context.RootValue,
UserContext = context.UserContext,
Operation = context.Operation,
Variables = context.Variables,
CancellationToken = context.CancellationToken,
Metrics = context.Metrics,
Errors = context.Errors,
Path = fieldPath
};
var subFields = SubFieldsFor(context, fieldDefinition.ResolvedType, field);
resolveContext.SubFields = subFields;
var resolver = fieldDefinition.Resolver ?? new NameFieldResolver();
var result = resolver.Resolve(resolveContext);
result = await UnwrapResultAsync(result)
.ConfigureAwait(false);
resolveResult.Value = await CompleteValueAsync(context, parentType, fieldDefinition.ResolvedType, field, result, fieldPath)
.ConfigureAwait(false);
return(resolveResult);
}
catch (Exception exc)
{
return(GenerateError(resolveResult, field, context, exc, path));
}
}
public bool ShouldIncludeNode(ExecutionContext context, Directives directives)
{
if (directives != null)
{
var directive = directives.Find(DirectiveGraphType.Skip.Name);
if (directive != null)
{
var values = GetArgumentValues(
context.Schema,
DirectiveGraphType.Skip.Arguments,
directive.Arguments,
context.Variables);
return !((bool) values["if"]);
}
directive = directives.Find(DirectiveGraphType.Include.Name);
if (directive != null)
{
var values = GetArgumentValues(
context.Schema,
DirectiveGraphType.Include.Arguments,
directive.Arguments,
context.Variables);
return (bool) values["if"];
}
}
return true;
}
public object ExecuteFields(ExecutionContext context, ObjectGraphType rootType, object source, Dictionary<string, Fields> fields)
{
var result = new Dictionary<string, object>();
fields.Apply(pair =>
{
result[pair.Key] = ResolveField(context, rootType, source, pair.Value);
});
return result;
}
public async Task <ResolveFieldResult <object> > ResolveField(ExecutionContext context, ObjectGraphType parentType, object source, Fields fields)
{
context.CancellationToken.ThrowIfCancellationRequested();
var resolveResult = new ResolveFieldResult <object>
{
Skip = false
};
var field = fields.First();
var fieldDefinition = GetFieldDefinition(context.Schema, parentType, field);
if (fieldDefinition == null)
{
resolveResult.Skip = true;
return(resolveResult);
}
var arguments = GetArgumentValues(context.Schema, fieldDefinition.Arguments, field.Arguments, context.Variables);
Func <ResolveFieldContext, object> defaultResolve = (ctx) =>
{
return(ctx.Source != null?GetProperyValue(ctx.Source, ctx.FieldAst.Name) : null);
};
try
{
var resolveContext = new ResolveFieldContext();
resolveContext.FieldName = field.Name;
resolveContext.FieldAst = field;
resolveContext.FieldDefinition = fieldDefinition;
resolveContext.ReturnType = context.Schema.FindType(fieldDefinition.Type);
resolveContext.ParentType = parentType;
resolveContext.Arguments = arguments;
resolveContext.Source = source;
resolveContext.Schema = context.Schema;
resolveContext.Fragments = context.Fragments;
resolveContext.RootValue = context.RootValue;
resolveContext.Operation = context.Operation;
resolveContext.Variables = context.Variables;
resolveContext.CancellationToken = context.CancellationToken;
var resolve = fieldDefinition.Resolve ?? defaultResolve;
var result = resolve(resolveContext);
if (result is Task)
{
var task = result as Task;
await task;
result = GetProperyValue(task, "Result");
}
if (parentType is __Field && result is Type)
{
result = context.Schema.FindType(result as Type);
}
resolveResult.Value = await CompleteValue(context, context.Schema.FindType(fieldDefinition.Type), fields, result);
return(resolveResult);
}
catch (Exception exc)
{
context.Errors.Add(new ExecutionError("Error trying to resolve {0}.".ToFormat(field.Name), exc));
resolveResult.Skip = false;
return(resolveResult);
}
}
public Task <Dictionary <string, object> > ExecuteFieldsAsync(ExecutionContext context, IObjectGraphType rootType, object source, Dictionary <string, Field> fields, IEnumerable <string> path)
{
return(fields.ToDictionaryAsync <KeyValuePair <string, Field>, string, ResolveFieldResult <object>, object>(
pair => pair.Key,
pair => ResolveFieldAsync(context, rootType, source, pair.Value, path.Concat(new[] { pair.Key }))));
}
public Dictionary <string, Field> CollectFields(
ExecutionContext context,
IGraphType specificType,
SelectionSet selectionSet,
Dictionary <string, Field> fields,
List <string> visitedFragmentNames)
{
if (fields == null)
{
fields = new Dictionary <string, Field>();
}
selectionSet?.Selections.Apply(selection =>
{
if (selection is Field)
{
var field = (Field)selection;
if (!ShouldIncludeNode(context, field.Directives))
{
return;
}
var name = field.Alias ?? field.Name;
fields[name] = field;
}
else if (selection is FragmentSpread)
{
var spread = (FragmentSpread)selection;
if (visitedFragmentNames.Contains(spread.Name) ||
!ShouldIncludeNode(context, spread.Directives))
{
return;
}
visitedFragmentNames.Add(spread.Name);
var fragment = context.Fragments.FindDefinition(spread.Name);
if (fragment == null ||
!ShouldIncludeNode(context, fragment.Directives) ||
!DoesFragmentConditionMatch(context, fragment.Type.Name, specificType))
{
return;
}
CollectFields(context, specificType, fragment.SelectionSet, fields, visitedFragmentNames);
}
else if (selection is InlineFragment)
{
var inline = (InlineFragment)selection;
var name = inline.Type != null ? inline.Type.Name : specificType.Name;
if (!ShouldIncludeNode(context, inline.Directives) ||
!DoesFragmentConditionMatch(context, name, specificType))
{
return;
}
CollectFields(context, specificType, inline.SelectionSet, fields, visitedFragmentNames);
}
});
return(fields);
}
public object ResolveField(ExecutionContext context, ObjectGraphType parentType, object source, Fields fields)
{
var field = fields.First();
var fieldDefinition = GetFieldDefinition(context.Schema, parentType, field);
if (fieldDefinition == null)
{
return null;
}
var arguments = GetArgumentValues(fieldDefinition.Arguments, field.Arguments, context.Variables);
Func<ResolveFieldContext, object> defaultResolve = (ctx) =>
{
return ctx.Source != null ? GetProperyValue(ctx.Source, ctx.FieldAst.Name) : null;
};
try
{
var resolveContext = new ResolveFieldContext();
resolveContext.FieldAst = field;
resolveContext.FieldDefinition = fieldDefinition;
resolveContext.Schema = context.Schema;
resolveContext.ParentType = parentType;
resolveContext.Arguments = arguments;
resolveContext.Source = source;
var resolve = fieldDefinition.Resolve ?? defaultResolve;
var result = resolve(resolveContext);
return CompleteValue(context, fieldDefinition.Type, fields, result);
}
catch (Exception exc)
{
context.Errors.Add(new ExecutionError("Error trying to resolve {0}.".ToFormat(field.Name), exc));
return null;
}
}
public override Task <ExecutionResult> ExecuteAsync(GraphQL.Execution.ExecutionContext context)
{
Executed.ShouldBeFalse();
Executed = true;
return(base.ExecuteAsync(context));
}
public async Task <object> CompleteValueAsync(ExecutionContext context, IObjectGraphType parentType, IGraphType fieldType, Field field, object result, IEnumerable <string> path)
{
var fieldName = field?.Name;
var nonNullType = fieldType as NonNullGraphType;
if (nonNullType != null)
{
var type = nonNullType.ResolvedType;
var completed = await CompleteValueAsync(context, parentType, type, field, result, path).ConfigureAwait(false);
if (completed == null)
{
var error = new ExecutionError("Cannot return null for non-null type. Field: {0}, Type: {1}!."
.ToFormat(fieldName, type.Name));
error.AddLocation(field, context.Document);
throw error;
}
return(completed);
}
if (result == null)
{
return(null);
}
if (fieldType is ScalarGraphType)
{
var scalarType = fieldType as ScalarGraphType;
var coercedValue = scalarType.Serialize(result);
return(coercedValue);
}
if (fieldType is ListGraphType)
{
var list = result as IEnumerable;
if (list == null)
{
var error = new ExecutionError("User error: expected an IEnumerable list though did not find one.");
error.AddLocation(field, context.Document);
throw error;
}
var listType = fieldType as ListGraphType;
var itemType = listType.ResolvedType;
var results = await list
.MapAsync(async (index, item) =>
await CompleteValueAsync(context, parentType, itemType, field, item, path.Concat(new[] { $"{index}" })).ConfigureAwait(false))
.ConfigureAwait(false);
return(results);
}
var objectType = fieldType as IObjectGraphType;
if (fieldType is IAbstractGraphType)
{
var abstractType = fieldType as IAbstractGraphType;
objectType = abstractType.GetObjectType(result);
if (objectType == null)
{
var error = new ExecutionError(
$"Abstract type {abstractType.Name} must resolve to an Object type at " +
$"runtime for field {parentType.Name}.{fieldName} " +
$"with value {result}, received 'null'.");
error.AddLocation(field, context.Document);
throw error;
}
if (!abstractType.IsPossibleType(objectType))
{
var error = new ExecutionError(
"Runtime Object type \"{0}\" is not a possible type for \"{1}\""
.ToFormat(objectType, abstractType));
error.AddLocation(field, context.Document);
throw error;
}
}
if (objectType == null)
{
return(null);
}
if (objectType.IsTypeOf != null && !objectType.IsTypeOf(result))
{
var error = new ExecutionError(
"Expected value of type \"{0}\" but got: {1}."
.ToFormat(objectType, result));
error.AddLocation(field, context.Document);
throw error;
}
var subFields = new Dictionary <string, Field>();
var visitedFragments = new List <string>();
subFields = CollectFields(context, objectType, field?.SelectionSet, subFields, visitedFragments);
return(await ExecuteFieldsAsync(context, objectType, result, subFields, path).ConfigureAwait(false));
}
public Dictionary <string, Fields> CollectFields(
ExecutionContext context,
GraphType specificType,
Selections selections,
Dictionary <string, Fields> fields,
List <string> visitedFragmentNames)
{
if (fields == null)
{
fields = new Dictionary <string, Fields>();
}
selections.Apply(selection =>
{
if (selection.Field != null)
{
if (!ShouldIncludeNode(context, selection.Field.Directives))
{
return;
}
var name = selection.Field.Alias ?? selection.Field.Name;
if (!fields.ContainsKey(name))
{
fields[name] = new Fields();
}
fields[name].Add(selection.Field);
}
else if (selection.Fragment != null)
{
if (selection.Fragment is FragmentSpread)
{
var spread = selection.Fragment as FragmentSpread;
if (visitedFragmentNames.Contains(spread.Name) ||
!ShouldIncludeNode(context, spread.Directives))
{
return;
}
visitedFragmentNames.Add(spread.Name);
var fragment = context.Fragments.FindDefinition(spread.Name);
if (fragment == null ||
!ShouldIncludeNode(context, fragment.Directives) ||
!DoesFragmentConditionMatch(context, fragment, specificType))
{
return;
}
CollectFields(context, specificType, fragment.Selections, fields, visitedFragmentNames);
}
else if (selection.Fragment is InlineFragment)
{
var inline = selection.Fragment as InlineFragment;
if (!ShouldIncludeNode(context, inline.Directives) ||
!DoesFragmentConditionMatch(context, inline, specificType))
{
return;
}
CollectFields(context, specificType, inline.Selections, fields, visitedFragmentNames);
}
}
});
return(fields);
}
public async Task<ResolveFieldResult<object>> ResolveFieldAsync(ExecutionContext context, IObjectGraphType parentType, object source, Fields fields)
{
context.CancellationToken.ThrowIfCancellationRequested();
var resolveResult = new ResolveFieldResult<object>
{
Skip = false
};
var field = fields.First();
var fieldDefinition = GetFieldDefinition(context.Schema, parentType, field);
if (fieldDefinition == null)
{
resolveResult.Skip = true;
return resolveResult;
}
var arguments = GetArgumentValues(context.Schema, fieldDefinition.Arguments, field.Arguments, context.Variables);
try
{
var resolveContext = new ResolveFieldContext();
resolveContext.FieldName = field.Name;
resolveContext.FieldAst = field;
resolveContext.FieldDefinition = fieldDefinition;
resolveContext.ReturnType = fieldDefinition.ResolvedType;
resolveContext.ParentType = parentType;
resolveContext.Arguments = arguments;
resolveContext.Source = source;
resolveContext.Schema = context.Schema;
resolveContext.Document = context.Document;
resolveContext.Fragments = context.Fragments;
resolveContext.RootValue = context.RootValue;
resolveContext.UserContext = context.UserContext;
resolveContext.Operation = context.Operation;
resolveContext.Variables = context.Variables;
resolveContext.CancellationToken = context.CancellationToken;
resolveContext.Metrics = context.Metrics;
var resolver = fieldDefinition.Resolver ?? new NameFieldResolver();
var result = resolver.Resolve(resolveContext);
if (result is Task)
{
var task = result as Task;
await task.ConfigureAwait(false);
result = task.GetProperyValue("Result");
}
resolveResult.Value =
await CompleteValueAsync(context, fieldDefinition.ResolvedType, fields, result).ConfigureAwait(false);
return resolveResult;
}
catch (Exception exc)
{
var error = new ExecutionError("Error trying to resolve {0}.".ToFormat(field.Name), exc);
error.AddLocation(field, context.Document);
context.Errors.Add(error);
resolveResult.Skip = false;
return resolveResult;
}
}
public Task <Dictionary <string, object> > ExecuteFieldsAsync(ExecutionContext context, IObjectGraphType rootType, object source, Dictionary <string, Fields> fields)
{
return(fields.ToDictionaryAsync <KeyValuePair <string, Fields>, string, ResolveFieldResult <object>, object>(
pair => pair.Key,
pair => ResolveFieldAsync(context, rootType, source, pair.Value)));
}
public Task<object> ExecuteOperation(ExecutionContext context)
{
var rootType = GetOperationRootType(context.Schema, context.Operation);
var fields = CollectFields(context, rootType, context.Operation.Selections, null);
return ExecuteFields(context, rootType, context.RootObject, fields);
}
public async Task<object> CompleteValueAsync(ExecutionContext context, IGraphType fieldType, Fields fields, object result)
{
var field = fields != null ? fields.FirstOrDefault() : null;
var fieldName = field != null ? field.Name : null;
var nonNullType = fieldType as NonNullGraphType;
if (nonNullType != null)
{
var type = nonNullType.ResolvedType;
var completed = await CompleteValueAsync(context, type, fields, result).ConfigureAwait(false);
if (completed == null)
{
var error = new ExecutionError("Cannot return null for non-null type. Field: {0}, Type: {1}!."
.ToFormat(fieldName, type.Name));
error.AddLocation(field, context.Document);
throw error;
}
return completed;
}
if (result == null)
{
return null;
}
if (fieldType is ScalarGraphType)
{
var scalarType = fieldType as ScalarGraphType;
var coercedValue = scalarType.Serialize(result);
return coercedValue;
}
if (fieldType is ListGraphType)
{
var list = result as IEnumerable;
if (list == null)
{
var error = new ExecutionError("User error: expected an IEnumerable list though did not find one.");
error.AddLocation(field, context.Document);
throw error;
}
var listType = fieldType as ListGraphType;
var itemType = listType.ResolvedType;
var results = await list.MapAsync(async item => await CompleteValueAsync(context, itemType, fields, item).ConfigureAwait(false)).ConfigureAwait(false);
return results;
}
var objectType = fieldType as IObjectGraphType;
if (fieldType is IAbstractGraphType)
{
var abstractType = fieldType as IAbstractGraphType;
objectType = abstractType.GetObjectType(result);
if (objectType != null && !abstractType.IsPossibleType(objectType))
{
var error = new ExecutionError(
"Runtime Object type \"{0}\" is not a possible type for \"{1}\""
.ToFormat(objectType, abstractType));
error.AddLocation(field, context.Document);
throw error;
}
}
if (objectType == null)
{
return null;
}
if (objectType.IsTypeOf != null && !objectType.IsTypeOf(result))
{
var error = new ExecutionError(
"Expected value of type \"{0}\" but got: {1}."
.ToFormat(objectType, result));
error.AddLocation(field, context.Document);
throw error;
}
var subFields = new Dictionary<string, Fields>();
var visitedFragments = new List<string>();
fields.Apply(f =>
{
subFields = CollectFields(context, objectType, f.SelectionSet, subFields, visitedFragments);
});
return await ExecuteFieldsAsync(context, objectType, result, subFields).ConfigureAwait(false);
}
public async Task<object> ResolveField(ExecutionContext context, ObjectGraphType parentType, object source, Fields fields)
{
context.CancellationToken.ThrowIfCancellationRequested();
var field = fields.First();
var fieldDefinition = GetFieldDefinition(context.Schema, parentType, field);
if (fieldDefinition == null)
{
return null;
}
var arguments = GetArgumentValues(context.Schema, fieldDefinition.Arguments, field.Arguments, context.Variables);
Func<ResolveFieldContext, object> defaultResolve = (ctx) =>
{
return ctx.Source != null ? GetProperyValue(ctx.Source, ctx.FieldAst.Name) : null;
};
try
{
var resolveContext = new ResolveFieldContext();
resolveContext.FieldAst = field;
resolveContext.FieldDefinition = fieldDefinition;
resolveContext.Schema = context.Schema;
resolveContext.ParentType = parentType;
resolveContext.Arguments = arguments;
resolveContext.Source = source;
resolveContext.CancellationToken = context.CancellationToken;
var resolve = fieldDefinition.Resolve ?? defaultResolve;
var result = resolve(resolveContext);
if(result is Task)
{
var task = result as Task;
await task;
result = GetProperyValue(task, "Result");
}
if (parentType is __Field && result is Type)
{
result = context.Schema.FindType(result as Type);
}
return await CompleteValue(context, context.Schema.FindType(fieldDefinition.Type), fields, result);
}
catch (Exception exc)
{
context.Errors.Add(new ExecutionError("Error trying to resolve {0}.".ToFormat(field.Name), exc));
return null;
}
}
public Dictionary<string, Fields> CollectFields(
ExecutionContext context,
IGraphType specificType,
SelectionSet selectionSet,
Dictionary<string, Fields> fields,
List<string> visitedFragmentNames)
{
if (fields == null)
{
fields = new Dictionary<string, Fields>();
}
selectionSet.Selections.Apply(selection =>
{
if (selection is Field)
{
var field = (Field)selection;
if (!ShouldIncludeNode(context, field.Directives))
{
return;
}
var name = field.Alias ?? field.Name;
if (!fields.ContainsKey(name))
{
fields[name] = new Fields();
}
fields[name].Add(field);
}
else if (selection is FragmentSpread)
{
var spread = (FragmentSpread)selection;
if (visitedFragmentNames.Contains(spread.Name)
|| !ShouldIncludeNode(context, spread.Directives))
{
return;
}
visitedFragmentNames.Add(spread.Name);
var fragment = context.Fragments.FindDefinition(spread.Name);
if (fragment == null
|| !ShouldIncludeNode(context, fragment.Directives)
|| !DoesFragmentConditionMatch(context, fragment.Type.Name, specificType))
{
return;
}
CollectFields(context, specificType, fragment.SelectionSet, fields, visitedFragmentNames);
}
else if (selection is InlineFragment)
{
var inline = (InlineFragment)selection;
var name = inline.Type != null ? inline.Type.Name : specificType.Name;
if (!ShouldIncludeNode(context, inline.Directives)
|| !DoesFragmentConditionMatch(context, name, specificType))
{
return;
}
CollectFields(context, specificType, inline.SelectionSet, fields, visitedFragmentNames);
}
});
return fields;
}
public Dictionary<string, Fields> CollectFields(ExecutionContext context, GraphType type, Selections selections, Dictionary<string, Fields> fields)
{
if (fields == null)
{
fields = new Dictionary<string, Fields>();
}
selections.Apply(selection =>
{
if (selection.Field != null)
{
if (!ShouldIncludeNode(context, selection.Field.Directives))
{
return;
}
var name = selection.Field.Alias ?? selection.Field.Name;
if (!fields.ContainsKey(name))
{
fields[name] = new Fields();
}
fields[name].Add(selection.Field);
}
else if (selection.Fragment != null)
{
if (selection.Fragment is FragmentSpread)
{
var spread = selection.Fragment as FragmentSpread;
if (!ShouldIncludeNode(context, spread.Directives))
{
return;
}
var fragment = context.Fragments.FindDefinition(spread.Name);
if (!ShouldIncludeNode(context, fragment.Directives)
|| !DoesFragmentConditionMatch(context, fragment, type))
{
return;
}
CollectFields(context, type, fragment.Selections, fields);
}
else if (selection.Fragment is InlineFragment)
{
var inline = selection.Fragment as InlineFragment;
if (!ShouldIncludeNode(context, inline.Directives)
|| !DoesFragmentConditionMatch(context, inline, type))
{
return;
}
CollectFields(context, type, inline.Selections, fields);
}
}
});
return fields;
}
public bool ShouldIncludeNode(ExecutionContext context, Directives directives)
{
if (directives != null)
{
var directive = directives.Find(DirectiveGraphType.Skip.Name);
if (directive != null)
{
var values = GetArgumentValues(
context.Schema,
DirectiveGraphType.Skip.Arguments,
directive.Arguments,
context.Variables);
object ifObj;
values.TryGetValue("if", out ifObj);
bool ifVal;
return !(bool.TryParse(ifObj?.ToString() ?? string.Empty, out ifVal) && ifVal);
}
directive = directives.Find(DirectiveGraphType.Include.Name);
if (directive != null)
{
var values = GetArgumentValues(
context.Schema,
DirectiveGraphType.Include.Arguments,
directive.Arguments,
context.Variables);
object ifObj;
values.TryGetValue("if", out ifObj);
bool ifVal;
return bool.TryParse(ifObj?.ToString() ?? string.Empty, out ifVal) && ifVal;
}
}
return true;
}
public bool DoesFragmentConditionMatch(ExecutionContext context, IHaveFragmentType fragment, GraphType type)
{
var conditionalType = context.Schema.FindType(fragment.Type);
if (conditionalType == type)
{
return true;
}
if (conditionalType is InterfaceGraphType)
{
var interfaceType = (InterfaceGraphType) conditionalType;
var hasInterfaces = type as IImplementInterfaces;
if (hasInterfaces != null)
{
var interfaces = context.Schema.FindTypes(hasInterfaces.Interfaces);
return interfaceType.IsPossibleType(interfaces);
}
}
return false;
}
public bool DoesFragmentConditionMatch(ExecutionContext context, string fragmentName, IGraphType type)
{
if (string.IsNullOrWhiteSpace(fragmentName))
{
return true;
}
var conditionalType = context.Schema.FindType(fragmentName);
if (conditionalType == null)
{
return false;
}
if (conditionalType.Equals(type))
{
return true;
}
if (conditionalType is IAbstractGraphType)
{
var abstractType = (IAbstractGraphType)conditionalType;
return abstractType.IsPossibleType(type);
}
return false;
}
public async Task <ResolveFieldResult <object> > ResolveFieldAsync(ExecutionContext context, IObjectGraphType parentType, object source, Fields fields)
{
context.CancellationToken.ThrowIfCancellationRequested();
var resolveResult = new ResolveFieldResult <object>
{
Skip = false
};
var field = fields.First();
var fieldDefinition = GetFieldDefinition(context.Schema, parentType, field);
if (fieldDefinition == null)
{
resolveResult.Skip = true;
return(resolveResult);
}
var arguments = GetArgumentValues(context.Schema, fieldDefinition.Arguments, field.Arguments, context.Variables);
try
{
var resolveContext = new ResolveFieldContext();
resolveContext.FieldName = field.Name;
resolveContext.FieldAst = field;
resolveContext.FieldDefinition = fieldDefinition;
resolveContext.ReturnType = fieldDefinition.ResolvedType;
resolveContext.ParentType = parentType;
resolveContext.Arguments = arguments;
resolveContext.Source = source;
resolveContext.Schema = context.Schema;
resolveContext.Document = context.Document;
resolveContext.Fragments = context.Fragments;
resolveContext.RootValue = context.RootValue;
resolveContext.UserContext = context.UserContext;
resolveContext.Operation = context.Operation;
resolveContext.Variables = context.Variables;
resolveContext.CancellationToken = context.CancellationToken;
resolveContext.Metrics = context.Metrics;
var resolver = fieldDefinition.Resolver ?? new NameFieldResolver();
var result = resolver.Resolve(resolveContext);
if (result is Task)
{
var task = result as Task;
await task.ConfigureAwait(false);
result = task.GetProperyValue("Result");
}
resolveResult.Value =
await CompleteValueAsync(context, fieldDefinition.ResolvedType, fields, result).ConfigureAwait(false);
return(resolveResult);
}
catch (Exception exc)
{
var error = new ExecutionError("Error trying to resolve {0}.".ToFormat(field.Name), exc);
error.AddLocation(field, context.Document);
context.Errors.Add(error);
resolveResult.Skip = false;
return(resolveResult);
}
}
public async Task<ResolveFieldResult<object>> ResolveFieldAsync(ExecutionContext context, ObjectGraphType parentType, object source, Fields fields)
{
context.CancellationToken.ThrowIfCancellationRequested();
var resolveResult = new ResolveFieldResult<object>
{
Skip = false
};
var field = fields.First();
var fieldDefinition = GetFieldDefinition(context.Schema, parentType, field);
if (fieldDefinition == null)
{
resolveResult.Skip = true;
return resolveResult;
}
var arguments = GetArgumentValues(context.Schema, fieldDefinition.Arguments, field.Arguments, context.Variables);
Func<ResolveFieldContext, object> defaultResolve =
ctx => ctx.Source != null
? GetProperyValue(ctx.Source, ctx.FieldAst.Name)
: null;
try
{
var resolveContext = new ResolveFieldContext();
resolveContext.FieldName = field.Name;
resolveContext.FieldAst = field;
resolveContext.FieldDefinition = fieldDefinition;
resolveContext.ReturnType = context.Schema.FindType(fieldDefinition.Type);
resolveContext.ParentType = parentType;
resolveContext.Arguments = arguments;
resolveContext.Source = source;
resolveContext.Schema = context.Schema;
resolveContext.Fragments = context.Fragments;
resolveContext.RootValue = context.RootValue;
resolveContext.Operation = context.Operation;
resolveContext.Variables = context.Variables;
resolveContext.CancellationToken = context.CancellationToken;
var resolve = fieldDefinition.Resolve ?? defaultResolve;
var result = resolve(resolveContext);
if(result is Task)
{
var task = result as Task;
await task.ConfigureAwait(false);
result = GetProperyValue(task, "Result");
}
if (parentType is __Field && result is Type)
{
result = context.Schema.FindType(result as Type);
}
resolveResult.Value = await CompleteValueAsync(context, context.Schema.FindType(fieldDefinition.Type), fields, result).ConfigureAwait(false);
return resolveResult;
}
catch (Exception exc)
{
var error = new ExecutionError("Error trying to resolve {0}.".ToFormat(field.Name), exc);
error.AddLocation(field.SourceLocation.Line, field.SourceLocation.Column);
context.Errors.Add(error);
resolveResult.Skip = false;
return resolveResult;
}
}
