private async Task HandleIntrospectionQuery(RequestPayload requestPayload, HttpContext httpContext)
{
var schema = _schemaProvider.Schema;
var convertedSchema = _schema ?? _schemaConverter.Convert(schema);
var docuemntExecutor = new DocumentExecuter();
var executionOptions = new ExecutionOptions()
{
Schema = convertedSchema,
OperationName = requestPayload.OperationName,
Query = requestPayload.Query,
Inputs = new Inputs(),
EnableMetrics = false,
ExposeExceptions = true,
SetFieldMiddleware = false,
FieldNameConverter = _graphOptions.FieldNameConverter == FieldNameConverter.Default
? _defaultConverter
: _camelCaseConverter
};
var result = await docuemntExecutor.ExecuteAsync(executionOptions);
httpContext.Response.ContentType = "application/json";
httpContext.Response.StatusCode = 200;
await new DocumentWriter().WriteAsync(httpContext.Response.Body, result);
}
private void SetVariables(GraphContext context, RequestPayload payload)
{
if (payload.Variables != null)
{
foreach (JProperty item in payload.Variables.Children())
{
context.Variables[item.Name] = item.Value;
}
}
}
public ValueTask <GraphContext> CreateAsync(RequestPayload payload)
{
var document = _documentBuilder.Build(payload.Query);
var operation = document.Operations.Single();
var operationName = operation.Name;
var operationType = (OperationType)(int)operation.OperationType;
IGraphType graphType;
var graphSchema = _schemaProvider.Schema;
switch (operationType)
{
case OperationType.Query:
{
graphType = graphSchema.Query;
break;
}
case OperationType.Mutation:
{
graphType = graphSchema.Mutation;
break;
}
default:
{
graphType = graphSchema.Subscription;
break;
}
}
if (!graphType.Fields.TryGetGetField(typeof(void), operationName, out var operationField))
{
throw new GraphException($"Specified GraphQL operation '{operationName}' does not exist in the schema");
}
var context = new GraphContext(operationName, operationType, operationField, _httpContextAccessor.HttpContext.RequestServices);
SetArguments(context, operation);
context.SelectionSet = _selectionSetProvider.GetSelectionSet(payload.Query, operation, document.Fragments);
SetVariables(context, payload);
context.SetArguments(payload.Query);
return(new ValueTask <GraphContext>(context));
}
