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RpcClient.cs
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RpcClient.cs
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using System;
using System.Collections.Generic;
using System.IO;
using System.IO.Compression;
using System.Linq;
using System.Threading.Tasks;
using EdjCase.JsonRpc.Common;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Text;
using EdjCase.JsonRpc.Common.Tools;
using System.Diagnostics;
namespace EdjCase.JsonRpc.Client
{
/// <summary>
/// A client for making rpc requests and receiving rpc responses
/// </summary>
public class RpcClient
{
/// <summary>
/// Base url for the rpc server
/// </summary>
public Uri BaseUrl { get; }
/// <summary>
/// Client to send and receive the serialized rpc requests from the server
/// </summary>
private IRpcTransportClient transportClient { get; }
/// <summary>
/// Json serializer for serializing requests and deserializing responses
/// </summary>
private IRequestSerializer requestSerializer { get; }
public RpcEvents Events { get; }
internal RpcClient(Uri baseUrl,
IRpcTransportClient transportClient,
IRequestSerializer requestSerializer,
RpcEvents events)
{
this.BaseUrl = baseUrl;
this.transportClient = transportClient ?? throw new ArgumentNullException(nameof(transportClient));
this.requestSerializer = requestSerializer ?? throw new ArgumentNullException(nameof(requestSerializer));
this.Events = events ?? throw new ArgumentNullException(nameof(events));
}
/// <summary>
/// Sends the specified rpc request to the server (Wrapper for other SendRequestAsync)
/// </summary>
/// <param name="method">Rpc method that is to be called</param>
/// <param name="route">(Optional) Route that will append to the base url if the request method call is not located at the base route</param>
/// <param name="paramList">List of parameters (in order) for the rpc method</param>
/// <returns>The rpc response for the sent request</returns>
public Task<RpcResponse<T>> SendAsync<T>(string method, string? route, params object[] paramList)
{
if (string.IsNullOrWhiteSpace(method))
{
throw new ArgumentNullException(nameof(method));
}
RpcRequest request = RpcRequest.WithParameterList(method, parameterList: paramList, id: new RpcId(1));
return this.SendAsync<T>(request, route);
}
/// <summary>
/// Sends the specified rpc request to the server
/// </summary>
/// <param name="request">Single rpc request that will goto the rpc server</param>
/// <param name="route">(Optional) Route that will append to the base url if the request method call is not located at the base route</param>
/// <typeparam name="TResponse">The deserialization type for the response result.</typeparam>
/// <returns>The rpc response for the sent request</returns>
public Task<RpcResponse<TResponse>> SendAsync<TResponse>(RpcRequest request, string? route = null)
{
if (request == null)
{
throw new ArgumentNullException(nameof(request));
}
var wrapper = new SingleRequestWrapper<TResponse>(request);
return this.SendAsync(wrapper, route);
}
/// <summary>
/// Sends the a http request to the server, posting the request in json format
/// </summary>
/// <param name="bulkRequest">Bulk request object that will goto the rpc server</param>
/// <param name="route">(Optional) Route that will append to the base url if the request method call is not located at the base route</param>
///
public Task<RpcBulkResponse> SendAsync(RpcBulkRequest bulkRequest, string? route = null)
{
if (bulkRequest == null)
{
throw new ArgumentNullException(nameof(bulkRequest));
}
var wrapper = new BulkRequestWrapper(bulkRequest);
return this.SendAsync(wrapper, route);
}
private async Task<TResponse> SendAsync<TResponse>(RequestWrapper<TResponse> request, string? route = null)
{
try
{
string requestJson = request.Serialize(this.requestSerializer);
Uri uri = new Uri(this.BaseUrl, route);
List<RpcRequest> requests = request.GetRequests();
var requestContext = new RequestEventContext(route, requests, requestJson);
ResponseEventContext? responseContext = null;
if (this.Events.OnRequestStartAsync != null)
{
await this.Events.OnRequestStartAsync(requestContext);
}
List<RpcResponse>? responses = null;
string responseJson;
Exception? error = null;
responseJson = await this.transportClient.SendRequestAsync(uri, requestJson);
try
{
if (string.IsNullOrWhiteSpace(responseJson))
{
throw new RpcClientParseException("Server did not return a rpc response, just an empty body.");
}
try
{
TResponse returnValue;
(responses, returnValue) = request.Deserialize(responseJson, this.requestSerializer);
responseContext = new ResponseEventContext(responseJson, responses);
return returnValue;
}
catch (Exception ex)
{
error = ex;
throw new RpcClientParseException($"Unable to parse response from server: '{responseJson}'", ex);
}
}
finally
{
if (this.Events.OnRequestCompleteAsync != null)
{
if(responseContext == null)
{
responseContext = new ResponseEventContext(responseJson, responses, error);
}
await this.Events.OnRequestCompleteAsync(responseContext, requestContext);
}
}
}
catch (Exception ex) when (!(ex is RpcClientException) && !(ex is RpcException))
{
throw new RpcClientUnknownException("Error occurred when trying to send rpc request(s)", ex);
}
}
public static HttpRpcClientBuilder Builder(Uri baseUrl)
{
return new HttpRpcClientBuilder(baseUrl);
}
private abstract class RequestWrapper<TResponse>
{
internal abstract string Serialize(IRequestSerializer requestSerializer);
internal abstract List<RpcRequest> GetRequests();
internal abstract (List<RpcResponse>, TResponse) Deserialize(string responseJson, IRequestSerializer requestSerializer);
}
private class SingleRequestWrapper<TResponse> : RequestWrapper<RpcResponse<TResponse>>
{
private RpcRequest request { get; }
public SingleRequestWrapper(RpcRequest request)
{
this.request = request;
}
internal override string Serialize(IRequestSerializer requestSerializer)
{
return requestSerializer.Serialize(this.request);
}
internal override List<RpcRequest> GetRequests()
{
return new List<RpcRequest> { this.request };
}
internal override (List<RpcResponse>, RpcResponse<TResponse>) Deserialize(string responseJson, IRequestSerializer requestSerializer)
{
var typeMap = new Dictionary<RpcId, Type> { [this.request.Id] = typeof(TResponse) };
var responses = requestSerializer.Deserialize(responseJson, typeMap);
return (responses, RpcResponse<TResponse>.FromResponse(responses.Single()));
}
}
private class BulkRequestWrapper : RequestWrapper<RpcBulkResponse>
{
private RpcBulkRequest request { get; }
public BulkRequestWrapper(RpcBulkRequest request)
{
this.request = request;
}
internal override (List<RpcResponse>, RpcBulkResponse) Deserialize(string responseJson, IRequestSerializer requestSerializer)
{
IDictionary<RpcId, Type> typeMap = this.request.GetTypeMap();
var responses = requestSerializer.Deserialize(responseJson, typeMap);
return (responses, RpcBulkResponse.FromResponses(responses));
}
internal override List<RpcRequest> GetRequests()
{
return this.request.GetRequests();
}
internal override string Serialize(IRequestSerializer requestSerializer)
{
return requestSerializer.SerializeBulk(this.request.GetRequests());
}
}
}
}