protected virtual object ResponseHandle(ProxyContext ctx, HttpResponseMessage response)
{
var serializer = ctx.Serializer;
var expectedReturnType = this.GetExpectedReturnType(ctx); //返回的是IAOPResult的实现
var stream = response.Content.ReadAsStreamAsync().GetAwaiter().GetResult();
if (stream == null)
{
throw new ResultException(-1, "Server No Response");
}
var aop = (IAOPResult)serializer.Deserialize(stream, expectedReturnType, null);
if (aop == null)
{
throw new ResultException(-2, "Unexpected Response");
}
this.Factory?.OnResultHandling(ctx, aop);
if (ctx.ResultInitialized)
{
return(ctx.ResultValue);
}
var methodInfo = ctx.CallMethod;
var returnType = methodInfo.ReturnType;
return(this.ResultHandle(aop, returnType, serializer));
}
protected virtual ProxyContext PrepareProxyContext(IDictionary <string, object> parameters, MethodInfo targetMethod, string contentType)
{
var serializer = SerializerFactory.Current.GetSerializer(contentType) ?? SerializerFactory.Current.Default;
var ctx = new ProxyContext {
ProxyInstance = this,
Serializer = serializer,
CallMethod = targetMethod,
Parameters = parameters,
ProxyUrl = this.GetRealUrl(this.ProxyUrl),
};
return(ctx);
}
private void OnRequest(ProxyContext ctx)
{
if (ctx.ExpectedReturnType != null)
{
return;
}
var name = $"{ctx.ProxyInstance.ProxyType}.{ctx.CallMethod.Name}";
if (this.returnTypes.TryGetValue(name, out var type))
{
ctx.ExpectedReturnType = type;
}
}
//获取方法期望的返回值，如果期望返回的不是IAOPResult，则包装成此类型
protected virtual Type GetExpectedReturnType(ProxyContext ctx)
{
var type = ctx.ExpectedReturnType;
if (type == null)
{
var methodInfo = ctx.CallMethod;
var returnType = methodInfo.ReturnType;
if (returnType.IsInterface) //方法定义的返回值是接口，需要转换成实现
{
if (returnType.IsGenericType && returnType.GetGenericTypeDefinition() == typeof(IAOPResult <>))
{
//返回值是IAOPResult<>（接口），则返回默认实现
var esbType = typeof(AOPResult <>);
type = esbType.MakeGenericType(returnType.GetGenericArguments());
}
else
{
type = typeof(AOPResult);
}
}
else if (returnType == typeof(void))
{
type = typeof(AOPResult);
}
else //方法定义的返回值是实际类型，则需要判断是否为IAOPResult的实现
{
if (typeof(IAOPResult).IsAssignableFrom(returnType))
{
type = returnType;
}
else
{
//不是IAOPResult的实现，则包装
var esbType = typeof(AOPResult <>);
type = esbType.MakeGenericType(returnType);
}
}
}
return(type);
}
protected virtual void PrepareRequest(ProxyContext ctx)
{
var parameters = ctx.Parameters;
var serializer = ctx.Serializer;
var request = ctx.HttpRequest;
var methodInfo = ctx.CallMethod;
parameters.Add("$method", methodInfo.ToString());
var methodName = this.GetCallMethodName(ctx);
parameters.Add("$action", methodName);
request.Headers.Add("$action", methodName);
ctx.ProxyUrl += "/" + methodName;
using (var ms = new MemoryStream()) {
serializer.Serialize(ms, parameters, null);
ms.Position = 0;
using (var sr = new StreamReader(ms)) {
request.Content = new StringContent(sr.ReadToEnd(), Encoding.UTF8, this.ContentType);
}
}
}
public void OnCalled(ProxyContext ctx)
{
this.Called?.Invoke(ctx);
}
public void OnResultHandling(ProxyContext ctx, IAOPResult result)
{
this.ResultHandling?.Invoke(ctx, result);
}
public void OnRequest(ProxyContext ctx)
{
this.Request?.Invoke(ctx);
}
public void OnCalling(ProxyContext ctx)
{
this.Calling?.Invoke(ctx);
}
protected override object ResponseHandle(ProxyContext ctx, HttpResponseMessage response)
{
return(ElapseTime("ResponseHandle`2", () => base.ResponseHandle(ctx, response)));
}
protected override void PrepareRequest(ProxyContext ctx)
{
ElapseTime("PrepareRequest", () => base.PrepareRequest(ctx));
}
protected virtual string GetCallMethodName(ProxyContext ctx)
{
return(ctx.CallMethod.Name);
}