public async Task InvokeAsync(IMiddlewareContext context)
{
DelegateDirective delegateDirective = context.Field
.Directives[DirectiveNames.Delegate]
.FirstOrDefault()?.ToObject <DelegateDirective>();
if (delegateDirective != null)
{
IImmutableStack <SelectionPathComponent> path =
delegateDirective.Path is null
? ImmutableStack <SelectionPathComponent> .Empty
: SelectionPathParser.Parse(delegateDirective.Path);
IReadOnlyQueryRequest request =
CreateQuery(context, delegateDirective.Schema, path);
IReadOnlyQueryResult result = await ExecuteQueryAsync(
context, request, delegateDirective.Schema)
.ConfigureAwait(false);
UpdateContextData(context, result, delegateDirective);
context.Result = new SerializedData(
ExtractData(result.Data, path.Count()));
ReportErrors(context, result.Errors);
}
await _next.Invoke(context).ConfigureAwait(false);
}
public void Parse_PathWithVarArgs_ThreeComponentsOneWithVarArgs()
{
// arrange
var serializedPath = new Source("foo(a: $foo:bar).bar.baz");
// act
Stack <SelectionPathComponent> path =
SelectionPathParser.Parse(serializedPath);
// assert
Assert.Collection(path.Reverse(),
c =>
{
Assert.Equal("foo", c.Name.Value);
Assert.Collection(c.Arguments,
a =>
{
Assert.Equal("a", a.Name.Value);
Assert.IsType <ScopedVariableNode>(a.Value);
var v = (ScopedVariableNode)a.Value;
Assert.Equal("foo_bar", v.ToVariableName());
});
},
c =>
{
Assert.Equal("bar", c.Name.Value);
Assert.Empty(c.Arguments);
},
c =>
{
Assert.Equal("baz", c.Name.Value);
Assert.Empty(c.Arguments);
});
}
public void Parse_PathWithoutArgs_ThreeComponentsFound()
{
// arrange
var serializedPath = new Source("foo.bar.baz");
// act
Stack <SelectionPathComponent> path =
SelectionPathParser.Parse(serializedPath);
// assert
Assert.Collection(path.Reverse(),
t =>
{
Assert.Equal("foo", t.Name.Value);
Assert.Empty(t.Arguments);
},
t =>
{
Assert.Equal("bar", t.Name.Value);
Assert.Empty(t.Arguments);
},
t =>
{
Assert.Equal("baz", t.Name.Value);
Assert.Empty(t.Arguments);
});
}
public void Parse_Two_Chain_With_Literal()
{
// arrange
var pathString = "foo(bar: 1).baz(quox: 2)";
// act
IImmutableStack <SelectionPathComponent> path =
SelectionPathParser.Parse(pathString);
// assert
Assert.Collection(path.Reverse(),
segment =>
{
Assert.Equal("foo", segment.Name.Value);
Assert.Collection(segment.Arguments,
argument =>
{
Assert.Equal("bar", argument.Name.Value);
Assert.Equal("1", argument.Value.Value);
});
},
segment =>
{
Assert.Equal("baz", segment.Name.Value);
Assert.Collection(segment.Arguments,
argument =>
{
Assert.Equal("quox", argument.Name.Value);
Assert.Equal("2", argument.Value.Value);
});
});
}
public void Parse_Single_Chain_With_ScopedVariable()
{
// arrange
var pathString = "foo(bar: $fields:foo)";
// act
IImmutableStack <SelectionPathComponent> path =
SelectionPathParser.Parse(pathString);
// assert
Assert.Collection(path,
segment =>
{
Assert.Equal("foo", segment.Name.Value);
Assert.Collection(segment.Arguments,
argument =>
{
Assert.Equal("bar", argument.Name.Value);
ScopedVariableNode variable =
Assert.IsType <ScopedVariableNode>(argument.Value);
Assert.Equal("fields", variable.Scope.Value);
Assert.Equal("foo", variable.Name.Value);
});
});
}
private Stack <SelectionPathComponent> GetSelectionPath(
IDirectiveContext directiveContext)
{
var directive = directiveContext.Directive
.ToObject <DelegateDirective>();
if (string.IsNullOrEmpty(directive.Path))
{
return(new Stack <SelectionPathComponent>());
}
return(SelectionPathParser.Parse(new Source(directive.Path)));
}
public void Parse_Single_Chain_No_Arguments()
{
// arrange
var pathString = "foo";
// act
IImmutableStack <SelectionPathComponent> path =
SelectionPathParser.Parse(pathString);
// assert
Assert.Collection(path,
segment =>
{
Assert.Equal("foo", segment.Name.Value);
Assert.Empty(segment.Arguments);
});
}
public void Parse_PathWithArgs_ThreeComponentsTwoWithArgs()
{
// arrange
var serializedPath = new Source("foo(a: 1).bar.baz(b: \"s\")");
// act
Stack <SelectionPathComponent> path =
SelectionPathParser.Parse(serializedPath);
// assert
Assert.Collection(path.Reverse(),
c =>
{
Assert.Equal("foo", c.Name.Value);
Assert.Collection(c.Arguments,
a =>
{
Assert.Equal("a", a.Name.Value);
Assert.IsType <IntValueNode>(a.Value);
});
},
c =>
{
Assert.Equal("bar", c.Name.Value);
Assert.Empty(c.Arguments);
},
c =>
{
Assert.Equal("baz", c.Name.Value);
Assert.Collection(c.Arguments,
a =>
{
Assert.Equal("b", a.Name.Value);
Assert.IsType <StringValueNode>(a.Value);
});
});
}
