private static void MethodHandler(this ExpressApplication app, string urlPrefix,
Func <object> serviceInstance, MethodInfo method, WebMethodAttribute meta)
{
// TODO support WebMethodAttribute options (caching, etc)
var invoke = DynamicMethods.CompileMethod(method.DeclaringType, method);
var parameters = method.GetParameters();
if (parameters.Length == 0)
{
app.Get(
Combine(urlPrefix, method.Name),
req =>
{
req.SetContext();
var result = invoke(serviceInstance(), new object[0]);
req.Json(result);
});
}
else
{
app.Get(
Combine(urlPrefix, method.Name),
req =>
{
req.SetContext();
var args = ParseQueryArgs(req, parameters);
var result = invoke(serviceInstance(), args);
req.Json(result);
});
app.Post(
Combine(urlPrefix, method.Name),
req =>
{
req.SetContext();
var args = ParseArgs(req, parameters);
var result = invoke(serviceInstance(), args);
req.Json(result);
});
}
}
private static ExpressApplication RestImpl(this ExpressApplication app,
string url, Type type, Func <int> nextIndex,
Func <RequestContext, object> getInstance,
Func <RequestContext, object> getModel)
{
app.Get(url, req => req.Json(getInstance(req)));
var props = type
.GetProperties(BindingFlags.Public | BindingFlags.Instance)
.Where(p => FilterProperty(p))
.ToList();
props.ForEach(prop =>
{
var propertyUrl = Combine(url, prop.Name);
var getter = DynamicMethods.CompileGetter(type, prop);
var setter = DynamicMethods.CompileSetter(type, prop);
Func <RequestContext, object> propertyInstance = req =>
{
var instance = getInstance(req);
return(getter(instance));
};
app.Get(propertyUrl, req => req.Json(propertyInstance(req)));
if (setter != null)
{
app.Update(propertyUrl, req =>
{
req.SetContext();
var json = req.ParseJson();
var hasChanges = ChangesDetector(req, getModel);
var instance = getInstance(req);
// TODO get default value from metadata
var defval = GetDefaultValue(prop.PropertyType);
var value = json.Get("value", defval, prop.PropertyType);
setter(instance, value);
req.Json(hasChanges() ? ModelPayload(req, getModel) : null);
});
}
if (IsCollection(prop.PropertyType))
{
RestCollection(app, propertyUrl, prop.PropertyType, nextIndex, propertyInstance, getModel);
}
else if (IsObject(prop.PropertyType))
{
RestImpl(app, propertyUrl, prop.PropertyType, nextIndex, propertyInstance, getModel);
}
});
var methods = type
.GetMethods(BindingFlags.Public | BindingFlags.Instance)
.Where(m => m.GetAttribute <RestAttribute>(true) != null)
.ToList();
methods.ForEach(method =>
{
var call = DynamicMethods.CompileMethod(type, method);
app.Post(url, req =>
{
req.SetContext();
var hasChanges = ChangesDetector(req, getModel);
var args = req.ParseArgs(method.GetParameters());
var collection = getInstance(req);
var result = call(collection, args);
req.Json(hasChanges() ? ModelPayload(req, getModel) : result);
});
});
return(app);
}
private static void RestCollection(this ExpressApplication app, string url, Type type, Func <int> nextIndex,
Func <RequestContext, object> getInstance, Func <RequestContext, object> getModel)
{
var indexer = DynamicMethods.CompileIndexer(type);
var indexName = "i" + nextIndex();
var indexUrl = Combine(url, string.Format("{{{0}}}", indexName));
Func <RequestContext, object> getItem = req =>
{
var index = req.Param <int>(indexName);
var collection = getInstance(req);
return(indexer(collection, index));
};
if (indexer != null)
{
app.Get(indexUrl, req => req.Json(getItem(req)));
}
// TODO dispatch multiple Add methods
var addMethod = type.GetMethod("Add");
if (addMethod != null)
{
var add = DynamicMethods.CompileMethod(type, addMethod);
app.Put(url, req =>
{
req.SetContext();
var hasChanges = ChangesDetector(req, getModel);
var args = req.ParseArgs(addMethod.GetParameters());
var collection = getInstance(req);
var result = add(collection, args);
req.Json(hasChanges() ? ModelPayload(req, getModel) : result);
});
}
var remove = DynamicMethods.CompileRemoveAt(type);
if (remove != null)
{
app.Delete(indexUrl, req =>
{
req.SetContext();
var hasChanges = ChangesDetector(req, getModel);
var index = req.Param <int>(indexName);
var collection = getInstance(req);
var result = remove(collection, index);
req.Json(hasChanges() ? ModelPayload(req, getModel) : result);
});
}
var countProperty = type.GetProperty("Count", BindingFlags.Instance | BindingFlags.Public);
if (countProperty != null && countProperty.GetIndexParameters().Length == 0)
{
var count = DynamicMethods.CompileGetter(type, countProperty);
app.Get(Combine(url, "Count"), req =>
{
var collection = getInstance(req);
req.Json(count(collection));
});
}
var itemType = GetItemType(type);
if (IsObject(itemType))
{
RestImpl(app, indexUrl, itemType, nextIndex, getItem, getModel);
}
}
