public async Task <T> MutateAsync <T>(Expression <Func <TMutation, T> > selector, CancellationToken token = default)
{
Check.IsNotNull(selector, nameof(selector));
var asyncBatch = new AsyncBatch(true);
var mutation = mutationFactory(asyncBatch);
var resultFactory = SchemaExpressionVisitor.VisitValueAccessors(mutation, selector).Compile();
await asyncBatch.ExecuteAsync(token);
return(resultFactory(mutation, null));
}
public async Task <OperationResult> ExecuteRequestAsync(
string queryText,
IDictionary <string, object> variableValues,
string operationName = null,
CancellationToken token = default)
{
Check.IsNotNullOrWhiteSpace(queryText, nameof(queryText));
var document = new Parser().Parse(new Lexer().Tokenize(queryText));
var operations = document.Definitions
.OfType <OperationDefinition>();
if (operationName != null)
{
operations = operations
.Where(x => x.Name == operationName);
}
var operationCount = operations
.Take(2)
.Count();
if (operationCount == 0)
{
throw new InvalidOperationException("No operations defined");
}
else if (operationCount > 1)
{
throw new InvalidOperationException("Multiple operations defined");
}
var operation = operations
.First();
var fragments = document.Definitions
.OfType <FragmentDefinition>()
.ToList();
if (operation.OperationType != OperationType.Query && mutationFactory == null)
{
throw new InvalidOperationException("No mutation defined");
}
var asyncBatch = new AsyncBatch(operation.OperationType == OperationType.Query);
var target = operation.OperationType == OperationType.Query
? (GraphQLObject)queryFactory(asyncBatch)
: mutationFactory(asyncBatch);
var errors = new List <GraphQLError>();
var variableDefinitions = (operation.VariableDefinitions ?? Enumerable.Empty <VariableDefinition>())
.ToDictionary(x => x.Name, x => x);
var variableTypes = (operation.VariableDefinitions ?? Enumerable.Empty <VariableDefinition>())
.ToDictionary(x => x.Name, x => x.Type);
var variables = new VariableValues((operation.VariableDefinitions ?? Enumerable.Empty <VariableDefinition>())
.ToDictionary(x => x.Name, x => variableValues.TryGetValue(x.Name, out var value) ? value : x.DefaultValue));
var fields = await FieldCollector.CollectFields(variables, variableTypes, target, operation.SelectionSet, fragments, errors, logger, exceptionFilter, token);
errors.AddRange(variables.UnusedVariables
.Select(x => new GraphQLError($"Variable '${x}' is not used. ", new[] { variableDefinitions[x].Location }))
.ToList()
);
if (errors.Any())
{
return(new OperationResult(null, errors));
}
try
{
await asyncBatch.ExecuteAsync(token);
}
catch (GraphQLException ex)
{
return(new OperationResult(null, ex.Errors));
}
var result = Apply(null, fields, errors);
return(new OperationResult(result, errors));
}