static bool IsRethrowOrEmitException(IOperationCoordinator coordinator, ILightNodeOptions options, IDictionary <string, object> environment, Exception ex)
{
var exString = ex.ToString();
coordinator.OnProcessInterrupt(options, environment, InterruptReason.ExecuteFailed, exString);
switch (options.ErrorHandlingPolicy)
{
case ErrorHandlingPolicy.ReturnInternalServerError:
environment.EmitInternalServerError();
environment.EmitStringMessage("500 InternalServerError");
return(false);
case ErrorHandlingPolicy.ReturnInternalServerErrorIncludeErrorDetails:
environment.EmitInternalServerError();
environment.EmitStringMessage(exString);
return(false);
case ErrorHandlingPolicy.ThrowException:
default:
environment.EmitInternalServerError();
return(true);
}
}
internal static object[] BindParameter(IDictionary<string, object> environment, ILightNodeOptions options, IOperationCoordinator coordinator, ValueProvider valueProvider, ParameterInfoSlim[] arguments)
{
var methodParameters = new object[arguments.Length];
for (int i = 0; i < arguments.Length; i++)
{
var item = arguments[i];
var _values = valueProvider.GetValue(item.Name);
var value = _values as string;
var values = _values as List<string>;
var isEmpty = _values == null;
var byteArray = _values as byte[];
// TODO:Experimental support
if (byteArray != null && item.ParameterTypeIsArray && item.ParameterType == typeof(byte[]))
{
methodParameters[i] = byteArray;
continue;
}
if (isEmpty && !item.ParameterTypeIsArray)
{
if (item.IsOptional)
{
methodParameters[i] = item.DefaultValue;
continue;
}
else if ((!item.ParameterTypeIsString || options.ParameterStringImplicitNullAsDefault) && (item.ParameterTypeIsClass || item.ParameterTypeIsNullable))
{
methodParameters[i] = null;
continue;
}
else
{
coordinator.OnProcessInterrupt(options, environment, InterruptReason.ParameterBindMissing, "Lack of Parameter:" + item.Name);
options.Logger.ParameterBindMissing(OperationMissingKind.LackOfParameter, item.Name);
if (options.OperationMissingHandlingPolicy == OperationMissingHandlingPolicy.ThrowException)
{
throw new ParameterMissingException(OperationMissingKind.LackOfParameter, item.Name);
}
else
{
environment.EmitBadRequest();
if (options.OperationMissingHandlingPolicy == OperationMissingHandlingPolicy.ReturnErrorStatusCodeIncludeErrorDetails)
{
environment.EmitStringMessage("Lack of Parameter:" + item.Name);
}
return null;
}
}
}
else if (!item.ParameterTypeIsArray)
{
var conv = TypeBinder.GetConverter(item.ParameterType, !options.ParameterEnumAllowsFieldNameParse);
if (conv == null) throw new InvalidOperationException("critical:register code is broken");
object pValue;
if (conv(value ?? values[0], out pValue))
{
methodParameters[i] = pValue;
continue;
}
else if (item.IsOptional)
{
methodParameters[i] = item.DefaultValue;
continue;
}
else if ((!item.ParameterTypeIsString || options.ParameterStringImplicitNullAsDefault) && (item.ParameterTypeIsClass || item.ParameterTypeIsNullable))
{
methodParameters[i] = null;
continue;
}
else
{
coordinator.OnProcessInterrupt(options, environment, InterruptReason.ParameterBindMissing, "Mismatch ParameterType:" + item.Name);
options.Logger.ParameterBindMissing(OperationMissingKind.MissmatchParameterType, item.Name);
if (options.OperationMissingHandlingPolicy == OperationMissingHandlingPolicy.ThrowException)
{
throw new ParameterMissingException(OperationMissingKind.MissmatchParameterType, item.Name);
}
else
{
environment.EmitBadRequest();
if (options.OperationMissingHandlingPolicy == OperationMissingHandlingPolicy.ReturnErrorStatusCodeIncludeErrorDetails)
{
environment.EmitStringMessage("Mismatch ParameterType:" + item.Name);
}
return null;
}
}
}
var arrayConv = TypeBinder.GetArrayConverter(item.ParameterType, !options.ParameterEnumAllowsFieldNameParse);
if (arrayConv == null) throw new InvalidOperationException("critical:register code is broken");
methodParameters[i] = arrayConv((values != null) ? values : (value != null) ? new[] { value } : (IList<string>)new string[0]);
continue;
}
return methodParameters;
}
Task InvokeRecursive(int index, IReadOnlyList <LightNodeFilterAttribute> filters, ILightNodeOptions options, OperationContext context, IOperationCoordinator coordinator)
{
index += 1;
if (filters.Count != index)
{
// chain next filter
return(filters[index].Invoke(context, () => InvokeRecursive(index, filters, options, context, coordinator)));
}
else
{
// execute operation
return(coordinator.ExecuteOperation(options, context, ExecuteOperation));
}
}
public Task Execute(ILightNodeOptions options, OperationContext context, IOperationCoordinator coordinator)
{
var targetFilters = coordinator.GetFilters(options, context, filters);
return(InvokeRecursive(-1, targetFilters, options, context, coordinator));
}
// Accept, Accept-Encoding flow
internal IContentFormatter NegotiateFormat(IDictionary <string, object> environment, string ext, ILightNodeOptions options, IOperationCoordinator coorinator)
{
var requestHeader = environment["owin.RequestHeaders"] as IDictionary <string, string[]>;
string[] accepts;
if (ForceUseFormatter != null)
{
return(ForceUseFormatter);
}
if (!string.IsNullOrWhiteSpace(ext))
{
// Ext match -> ContentEncoding match
var selectedFormatters = formatterByExt[ext] as ICollection <IContentFormatter> ?? formatterByExt[ext].ToArray();
if (!selectedFormatters.Any())
{
coorinator.OnProcessInterrupt(options, environment, InterruptReason.NegotiateFormatFailed, "Ext:" + ext);
options.Logger.NegotiateFormatFailed(OperationMissingKind.NegotiateFormatFailed, ext);
if (options.OperationMissingHandlingPolicy == OperationMissingHandlingPolicy.ThrowException)
{
throw new NegotiateFormatFailedException(OperationMissingKind.NegotiateFormatFailed, ext);
}
else
{
environment.EmitNotAcceptable();
if (options.OperationMissingHandlingPolicy == OperationMissingHandlingPolicy.ReturnErrorStatusCodeIncludeErrorDetails)
{
environment.EmitStringMessage("NegotiateFormat failed, ext:" + ext);
}
}
return(null);
}
return(SelectAcceptEncodingFormatter(requestHeader, selectedFormatters));
}
else if (requestHeader.TryGetValue("Accept", out accepts))
{
if (optionFormatters.Length == 1)
{
return(options.DefaultFormatter); // optimize path, defaultFormatter only
}
// MediaType match -> ContentEncoding match
var acceptsValues = GetDescendingQualityHeaderValues(accepts);
var formatters = acceptsValues.SelectMany(x => formatterByMediaType[x.Item3]).ToArray();
if (formatters.Length == 0)
{
// only accept-encoding
goto CONTENT_ENCODING_MATCH;
}
return(SelectAcceptEncodingFormatter(requestHeader, formatters));
}
// ContentEncoding match
CONTENT_ENCODING_MATCH:
{
if (optionFormatters.Length == 1)
{
return(options.DefaultFormatter); // optimize path, defaultFormatter only
}
// ContentEncoding match
string[] rawAcceptEncoding;
if (!requestHeader.TryGetValue("Accept-Encoding", out rawAcceptEncoding))
{
return(options.DefaultFormatter);
}
var acceptEncodings = GetDescendingQualityHeaderValues(rawAcceptEncoding);
var formatter = acceptEncodings
.Select(kvp => formatterByContentEncoding[kvp.Item3].FirstOrDefault())
.FirstOrDefault(x => x != null);
if (formatter == null)
{
return(options.DefaultFormatter);
}
return(formatter);
}
}
internal static object[] BindParameter(HttpContext httpContext, ILightNodeOptions options, IOperationCoordinator coordinator, ValueProvider valueProvider, ParameterInfoSlim[] arguments)
{
var methodParameters = new object[arguments.Length];
for (int i = 0; i < arguments.Length; i++)
{
var item = arguments[i];
var _values = valueProvider.GetValue(item.Name);
var value = _values as string;
var values = _values as List <string>;
var isEmpty = _values == null;
if (isEmpty && !item.ParameterTypeIsArray)
{
if (item.IsOptional)
{
methodParameters[i] = item.DefaultValue;
continue;
}
else if ((!item.ParameterTypeIsString || options.ParameterStringImplicitNullAsDefault) && (item.ParameterTypeIsClass || item.ParameterTypeIsNullable))
{
methodParameters[i] = null;
continue;
}
else
{
coordinator.OnProcessInterrupt(options, httpContext, InterruptReason.ParameterBindMissing, "Lack of Parameter:" + item.Name);
options.Logger.ParameterBindMissing(OperationMissingKind.LackOfParameter, item.Name);
if (options.OperationMissingHandlingPolicy == OperationMissingHandlingPolicy.ThrowException)
{
throw new ParameterMissingException(OperationMissingKind.LackOfParameter, item.Name);
}
else
{
httpContext.EmitBadRequest();
if (options.OperationMissingHandlingPolicy == OperationMissingHandlingPolicy.ReturnErrorStatusCodeIncludeErrorDetails)
{
httpContext.EmitStringMessage("Lack of Parameter:" + item.Name);
}
return(null);
}
}
}
else if (!item.ParameterTypeIsArray)
{
var conv = TypeBinder.GetConverter(item.ParameterType, !options.ParameterEnumAllowsFieldNameParse);
if (conv == null)
{
throw new InvalidOperationException("critical:register code is broken");
}
object pValue;
if (conv(value ?? values[0], out pValue))
{
methodParameters[i] = pValue;
continue;
}
else if (item.IsOptional)
{
methodParameters[i] = item.DefaultValue;
continue;
}
else if ((!item.ParameterTypeIsString || options.ParameterStringImplicitNullAsDefault) && (item.ParameterTypeIsClass || item.ParameterTypeIsNullable))
{
methodParameters[i] = null;
continue;
}
else
{
coordinator.OnProcessInterrupt(options, httpContext, InterruptReason.ParameterBindMissing, "Mismatch ParameterType:" + item.Name);
options.Logger.ParameterBindMissing(OperationMissingKind.MissmatchParameterType, item.Name);
if (options.OperationMissingHandlingPolicy == OperationMissingHandlingPolicy.ThrowException)
{
throw new ParameterMissingException(OperationMissingKind.MissmatchParameterType, item.Name);
}
else
{
httpContext.EmitBadRequest();
if (options.OperationMissingHandlingPolicy == OperationMissingHandlingPolicy.ReturnErrorStatusCodeIncludeErrorDetails)
{
httpContext.EmitStringMessage("Mismatch ParameterType:" + item.Name);
}
return(null);
}
}
}
var arrayConv = TypeBinder.GetArrayConverter(item.ParameterType, !options.ParameterEnumAllowsFieldNameParse);
if (arrayConv == null)
{
throw new InvalidOperationException("critical:register code is broken");
}
methodParameters[i] = arrayConv((values != null) ? values : (value != null) ? new[] { value } : (IList <string>) new string[0]);
continue;
}
return(methodParameters);
}
Task InvokeRecursive(int index, IReadOnlyList<LightNodeFilterAttribute> filters, ILightNodeOptions options, OperationContext context, IOperationCoordinator coordinator)
{
index += 1;
if (filters.Count != index)
{
// chain next filter
return filters[index].Invoke(context, () => InvokeRecursive(index, filters, options, context, coordinator));
}
else
{
// execute operation
return coordinator.ExecuteOperation(options, context, ExecuteOperation);
}
}
OperationHandler SelectHandler(IDictionary <string, object> environment, IOperationCoordinator coorinator, out AcceptVerbs verb, out string ext)
{
// out default
verb = AcceptVerbs.Get;
ext = "";
var path = environment["owin.RequestPath"] as string;
var method = environment["owin.RequestMethod"] as string;
// extract path
var keyBase = path.Trim('/').Split('/');
if (keyBase.Length != 2)
{
goto NOT_FOUND;
}
// extract "extension" for media type
var extStart = keyBase[1].LastIndexOf(".");
if (extStart != -1)
{
ext = keyBase[1].Substring(extStart + 1);
keyBase[1] = keyBase[1].Substring(0, keyBase[1].Length - ext.Length - 1);
}
// {ClassName, MethodName}
var key = new RequestPath(keyBase[0], keyBase[1]);
OperationHandler handler;
if (handlers.TryGetValue(key, out handler))
{
// verb check
if (StringComparer.OrdinalIgnoreCase.Equals(method, "GET"))
{
verb = AcceptVerbs.Get;
}
else if (StringComparer.OrdinalIgnoreCase.Equals(method, "POST"))
{
verb = AcceptVerbs.Post;
}
else if (StringComparer.OrdinalIgnoreCase.Equals(method, "PUT"))
{
verb = AcceptVerbs.Put;
}
else if (StringComparer.OrdinalIgnoreCase.Equals(method, "DELETE"))
{
verb = AcceptVerbs.Delete;
}
else if (StringComparer.OrdinalIgnoreCase.Equals(method, "PATCH"))
{
verb = AcceptVerbs.Patch;
}
else
{
goto VERB_MISSING;
}
if (!handler.AcceptVerb.HasFlag(verb))
{
goto VERB_MISSING;
}
return(handler); // OK
}
else
{
goto NOT_FOUND;
}
VERB_MISSING:
coorinator.OnProcessInterrupt(options, environment, InterruptReason.MethodNotAllowed, "MethodName:" + method);
options.Logger.MethodNotAllowed(OperationMissingKind.MethodNotAllowed, path, method);
if (options.OperationMissingHandlingPolicy == OperationMissingHandlingPolicy.ThrowException)
{
throw new MethodNotAllowedException(OperationMissingKind.MethodNotAllowed, path, method);
}
else
{
environment.EmitMethodNotAllowed();
if (options.OperationMissingHandlingPolicy == OperationMissingHandlingPolicy.ReturnErrorStatusCodeIncludeErrorDetails)
{
environment.EmitStringMessage("MethodNotAllowed:" + method);
}
return(null);
}
NOT_FOUND:
coorinator.OnProcessInterrupt(options, environment, InterruptReason.OperationNotFound, "SearchedPath:" + path);
options.Logger.OperationNotFound(OperationMissingKind.OperationNotFound, path);
if (options.OperationMissingHandlingPolicy == OperationMissingHandlingPolicy.ThrowException)
{
throw new OperationNotFoundException(OperationMissingKind.MethodNotAllowed, path);
}
else
{
environment.EmitNotFound();
if (options.OperationMissingHandlingPolicy == OperationMissingHandlingPolicy.ReturnErrorStatusCodeIncludeErrorDetails)
{
environment.EmitStringMessage("OperationNotFound:" + path);
}
return(null);
}
}
public Task Execute(ILightNodeOptions options, OperationContext context, IOperationCoordinator coordinator)
{
var targetFilters = coordinator.GetFilters(options, context, filters);
return InvokeRecursive(-1, targetFilters, options, context, coordinator);
}
// Accept, Accept-Encoding flow
internal IContentFormatter NegotiateFormat(IDictionary<string, object> environment, string ext, ILightNodeOptions options, IOperationCoordinator coorinator)
{
var requestHeader = environment["owin.RequestHeaders"] as IDictionary<string, string[]>;
string[] accepts;
if (ForceUseFormatter != null) return ForceUseFormatter;
if (!string.IsNullOrWhiteSpace(ext))
{
// Ext match -> ContentEncoding match
var selectedFormatters = formatterByExt[ext] as ICollection<IContentFormatter> ?? formatterByExt[ext].ToArray();
if (!selectedFormatters.Any())
{
coorinator.OnProcessInterrupt(options, environment, InterruptReason.NegotiateFormatFailed, "Ext:" + ext);
options.Logger.NegotiateFormatFailed(OperationMissingKind.NegotiateFormatFailed, ext);
if (options.OperationMissingHandlingPolicy == OperationMissingHandlingPolicy.ThrowException)
{
throw new NegotiateFormatFailedException(OperationMissingKind.NegotiateFormatFailed, ext);
}
else
{
environment.EmitNotAcceptable();
if (options.OperationMissingHandlingPolicy == OperationMissingHandlingPolicy.ReturnErrorStatusCodeIncludeErrorDetails)
{
environment.EmitStringMessage("NegotiateFormat failed, ext:" + ext);
}
}
return null;
}
return SelectAcceptEncodingFormatter(requestHeader, selectedFormatters);
}
else if (requestHeader.TryGetValue("Accept", out accepts))
{
if (optionFormatters.Length == 1) return options.DefaultFormatter; // optimize path, defaultFormatter only
// MediaType match -> ContentEncoding match
var acceptsValues = GetDescendingQualityHeaderValues(accepts);
var formatters = acceptsValues.SelectMany(x => formatterByMediaType[x.Item3]).ToArray();
if (formatters.Length == 0)
{
// only accept-encoding
goto CONTENT_ENCODING_MATCH;
}
return SelectAcceptEncodingFormatter(requestHeader, formatters);
}
// ContentEncoding match
CONTENT_ENCODING_MATCH:
{
if (optionFormatters.Length == 1) return options.DefaultFormatter; // optimize path, defaultFormatter only
// ContentEncoding match
string[] rawAcceptEncoding;
if (!requestHeader.TryGetValue("Accept-Encoding", out rawAcceptEncoding))
{
return options.DefaultFormatter;
}
var acceptEncodings = GetDescendingQualityHeaderValues(rawAcceptEncoding);
var formatter = acceptEncodings
.Select(kvp => formatterByContentEncoding[kvp.Item3].FirstOrDefault())
.FirstOrDefault(x => x != null);
if (formatter == null) return options.DefaultFormatter;
return formatter;
}
}
OperationHandler SelectHandler(IDictionary<string, object> environment, IOperationCoordinator coorinator, out AcceptVerbs verb, out string ext)
{
// out default
verb = AcceptVerbs.Get;
ext = "";
var path = environment["owin.RequestPath"] as string;
var method = environment["owin.RequestMethod"] as string;
// extract path
var keyBase = path.Trim('/').Split('/');
if (keyBase.Length != 2)
{
goto NOT_FOUND;
}
// extract "extension" for media type
var extStart = keyBase[1].LastIndexOf(".");
if (extStart != -1)
{
ext = keyBase[1].Substring(extStart + 1);
keyBase[1] = keyBase[1].Substring(0, keyBase[1].Length - ext.Length - 1);
}
// {ClassName, MethodName}
var key = new RequestPath(keyBase[0], keyBase[1]);
OperationHandler handler;
if (handlers.TryGetValue(key, out handler))
{
// verb check
if (StringComparer.OrdinalIgnoreCase.Equals(method, "GET"))
{
verb = AcceptVerbs.Get;
}
else if (StringComparer.OrdinalIgnoreCase.Equals(method, "POST"))
{
verb = AcceptVerbs.Post;
}
else if (StringComparer.OrdinalIgnoreCase.Equals(method, "PUT"))
{
verb = AcceptVerbs.Put;
}
else if (StringComparer.OrdinalIgnoreCase.Equals(method, "DELETE"))
{
verb = AcceptVerbs.Delete;
}
else if (StringComparer.OrdinalIgnoreCase.Equals(method, "PATCH"))
{
verb = AcceptVerbs.Patch;
}
else
{
goto VERB_MISSING;
}
if (!handler.AcceptVerb.HasFlag(verb))
{
goto VERB_MISSING;
}
return handler; // OK
}
else
{
goto NOT_FOUND;
}
VERB_MISSING:
coorinator.OnProcessInterrupt(options, environment, InterruptReason.MethodNotAllowed, "MethodName:" + method);
options.Logger.MethodNotAllowed(OperationMissingKind.MethodNotAllowed, path, method);
if (options.OperationMissingHandlingPolicy == OperationMissingHandlingPolicy.ThrowException)
{
throw new MethodNotAllowedException(OperationMissingKind.MethodNotAllowed, path, method);
}
else
{
environment.EmitMethodNotAllowed();
if (options.OperationMissingHandlingPolicy == OperationMissingHandlingPolicy.ReturnErrorStatusCodeIncludeErrorDetails)
{
environment.EmitStringMessage("MethodNotAllowed:" + method);
}
return null;
}
NOT_FOUND:
coorinator.OnProcessInterrupt(options, environment, InterruptReason.OperationNotFound, "SearchedPath:" + path);
options.Logger.OperationNotFound(OperationMissingKind.OperationNotFound, path);
if (options.OperationMissingHandlingPolicy == OperationMissingHandlingPolicy.ThrowException)
{
throw new OperationNotFoundException(OperationMissingKind.MethodNotAllowed, path);
}
else
{
environment.EmitNotFound();
if (options.OperationMissingHandlingPolicy == OperationMissingHandlingPolicy.ReturnErrorStatusCodeIncludeErrorDetails)
{
environment.EmitStringMessage("OperationNotFound:" + path);
}
return null;
}
}
static bool IsRethrowOrEmitException(IOperationCoordinator coordinator, ILightNodeOptions options, IDictionary<string, object> environment, Exception ex)
{
var exString = ex.ToString();
coordinator.OnProcessInterrupt(options, environment, InterruptReason.ExecuteFailed, exString);
switch (options.ErrorHandlingPolicy)
{
case ErrorHandlingPolicy.ReturnInternalServerError:
environment.EmitInternalServerError();
environment.EmitStringMessage("500 InternalServerError");
return false;
case ErrorHandlingPolicy.ReturnInternalServerErrorIncludeErrorDetails:
environment.EmitInternalServerError();
environment.EmitStringMessage(exString);
return false;
case ErrorHandlingPolicy.ThrowException:
default:
environment.EmitInternalServerError();
return true;
}
}
public BackgroundHostedService(ILogger <BackgroundHostedService> logger, IOperationCoordinator operationCoordinator)
{
this.logger = logger;
this.operationCoordinator = operationCoordinator;
}
