private void CalcVariableDefaultValues(GraphQLOperation op)
{
foreach (var varDef in op.Variables)
{
if (varDef.ParsedDefaultValue == null)
{
continue;
}
var inpDef = varDef.InputDef;
var typeRef = inpDef.TypeRef;
var eval = GetInputValueEvaluator(inpDef, varDef.ParsedDefaultValue, typeRef);
if (!eval.IsConst())
{
// somewhere inside there's reference to variable, this is not allowed
AddError($"Default value cannot reference variables.", varDef);
continue;
}
var value = eval.GetValue(_requestContext);
if (value != null && value.GetType() != typeRef.TypeDef.ClrType)
{
// TODO: add valid coersion rules; for ex, spec allows auto convert like int => int[]
AddError($"Detected type mismatch for default value '{value}' of variable {varDef.Name} of type {typeRef.Name}", varDef);
}
inpDef.DefaultValue = value;
inpDef.HasDefaultValue = true;
} // foreach varDef
}
private async Task ExecuteOperationAsync(GraphQLOperation op, OutputObjectScope topScope)
{
var opOutItemSet = op.SelectionSubset.MappedItemSets.FirstOrDefault(fi => fi.ObjectTypeDef == op.OperationTypeDef);
var topFields = _requestContext.GetIncludedMappedFields(opOutItemSet);
topScope.Init(op.OperationTypeDef, topFields);
var parallel = _parallelQuery && op.OperationType == OperationType.Query && topFields.Count > 1;
// Note: if we go parallel here, note that the topScope is safe for concurrent thread access;
// it is only used to save op result value (SetValue method)
var executers = new List <OperationFieldExecuter>();
for (int fieldIndex = 0; fieldIndex < topFields.Count; fieldIndex++)
{
var opExecuter = new OperationFieldExecuter(_requestContext, topScope, fieldIndex);
executers.Add(opExecuter);
}
_requestContext.Metrics.ExecutionThreadCount = executers.Count;
if (parallel)
{
await ExecuteAllParallel(executers);
}
else
{
await ExecuteAllNonParallel(executers);
}
}
private void CalcVariableDefaultValues(GraphQLOperation op)
{
foreach (var varDef in op.Variables)
{
if (varDef.ParsedDefaultValue == null)
{
continue;
}
var inpDef = varDef.InputDef;
var typeRef = inpDef.TypeRef;
var eval = GetInputValueEvaluator(inpDef, varDef.ParsedDefaultValue, typeRef);
if (!eval.IsConst())
{
// somewhere inside there's reference to variable, this is not allowed
AddError($"Default value cannot reference variables.", varDef);
continue;
}
var value = eval.GetValue(_requestContext);
if (value != null && value.GetType() != typeRef.TypeDef.ClrType)
{
// TODO: fix that, add type conversion, for now throwing exception; or maybe it's not needed, value will be converted at time of use
// but spec also allows auto casting like int => int[]
AddError($"Detected type mismatch for default value '{value}' of variable {varDef.Name} of type {typeRef.Name}", varDef);
}
inpDef.DefaultValue = value;
inpDef.HasDefaultValue = true;
} // foreach varDef
}
public void MapAndValidateRequest()
{
var fragmAnalyzer = new FragmentAnalyzer(_requestContext);
fragmAnalyzer.Analyze();
if (_requestContext.Failed)
{
return;
}
foreach (var fragm in _requestContext.ParsedRequest.Fragments)
{
if (!fragm.IsInline)
{
MapFragment(fragm);
}
}
foreach (var op in _requestContext.ParsedRequest.Operations)
{
if (!AssignOperationDef(op))
{
continue;
}
MapOperation(op);
CalcVariableDefaultValues(op);
}
_currentOp = null;
}
private void MapOperation(GraphQLOperation op)
{
MapSelectionSubSet(op.SelectionSubset, op.OperationTypeDef, op.Directives);
if (_pendingSelectionSets.Count > 0)
{
MapPendingSelectionSubsets();
}
}
private void BuildDefaultQuery(Node qNode)
{
var query = new GraphQLOperation()
{
Name = null, OperationType = OperationType.Query
};
CompleteBuildOperation(query, qNode);
}
public void MapAndValidateRequest()
{
Fragments_MapValidate();
if (_requestContext.Failed)
{
return;
}
foreach (var op in _requestContext.ParsedRequest.Operations)
{
op.OperationTypeDef = _model.GetOperationDef(op.OperationType);
_currentOp = op;
CalcVariableDefaultValues(op);
MapOperation(op);
}
_currentOp = null;
}
private void BuildOperations(IList <Node> opNodes)
{
foreach (var opNode in opNodes)
{
var nameNode = opNode.FindChild(TermNames.Name);
string name = nameNode?.GetText() ?? null;
var opTypeNode = opNode.FindChild(TermNames.OpType);
var opTypeStr = opTypeNode.GetText();
if (!Enum.TryParse <OperationType>(opTypeStr, true, out var opType))
{
AddError($"Invalid operation type '{opTypeStr}'.", opTypeNode);
continue;
}
var op = new GraphQLOperation()
{
Name = name, OperationType = opType
};
CompleteBuildOperation(op, opNode);
}
}
private bool AssignOperationDef(GraphQLOperation op)
{
ObjectTypeDef opDef = null;
switch (op.OperationType)
{
case OperationType.Query: opDef = _model.QueryType; break;
case OperationType.Mutation: opDef = _model.MutationType; break;
case OperationType.Subscription: opDef = _model.SubscriptionType; break;
}
if (opDef == null)
{
AddError($"Operation '{op.OperationType}' is not defined in schema. Operation: '{op.Name}'.", op);
return(false);
}
op.OperationTypeDef = opDef;
return(true);
}
private void CompleteBuildOperation(GraphQLOperation op, Node opNode)
{
try {
if (op.Name != null)
{
_path.Push(op.Name);
}
var varDefsNode = opNode.FindChild(TermNames.VarDefList);
op.Variables = BuildOperationVariables(varDefsNode);
var selSetNode = opNode.FindChild(TermNames.SelSet);
if (selSetNode != null)
{
var selItems = BuildSelectionItemsList(selSetNode, op);
op.SelectionSubset = new SelectionSubset(op, selItems, selSetNode.GetLocation());
}
_requestContext.ParsedRequest.Operations.Add(op);
} finally {
// op.Name might have been assigned, so we don't check name, but just pop path
_path.Clear();
}
}
private async Task ExecuteOperationAsync(GraphQLOperation op, OutputObjectScope topScope)
{
var mappedTopSubset = op.SelectionSubset.MappedSubSets[0];
var topMappedItems = mappedTopSubset.MappedItems;
var parallel = _parallelQueryEnabled && op.OperationType == OperationType.Query &&
op.SelectionSubset.Items.Count > 1;
var executers = new List <OperationFieldExecuter>();
foreach (var mappedItem in topMappedItems)
{
switch (mappedItem)
{
case MappedFragmentSpread mfs:
_requestContext.AddInputError($"Top selection items may not be fragments", mfs.Spread);
return;
case MappedSelectionField mappedField:
var opExecuter = new OperationFieldExecuter(_requestContext, mappedField, topScope);
executers.Add(opExecuter);
break;
}
}
if (parallel)
{
await ExecuteAllParallel(executers);
}
else
{
await ExecuteAllNonParallel(executers);
}
// Save results from op fields into top scope; we do it here, after all threads finished, to avoid concurrency issues
// and preserve output field order
foreach (var ex in executers)
{
topScope.SetValue(ex.ResultKey, ex.Result);
}
}
private void MapOperation(GraphQLOperation op)
{
_currentOp = op;
MapSelectionSubSet(op.SelectionSubset, op.OperationTypeDef);
}