public async Task TestUpdateRetry()
{
Mock.Expect(HttpMethod.Get, "http://localhost/endpoint")
.Respond(_ => new HttpResponseMessage
{
Content = new StringContent("{\"id\":5,\"name\":\"test1\"}", Encoding.UTF8, JsonMime),
Headers = { ETag = new EntityTagHeaderValue("\"1\"") }
});
Mock.Expect(HttpMethod.Put, "http://localhost/endpoint")
.WithContent("{\"id\":5,\"name\":\"testX\"}")
.WithHeaders("If-Match", "\"1\"")
.Respond(HttpStatusCode.PreconditionFailed);
Mock.Expect(HttpMethod.Get, "http://localhost/endpoint")
.Respond(_ => new HttpResponseMessage
{
Content = new StringContent("{\"id\":5,\"name\":\"test2\"}", Encoding.UTF8, JsonMime),
Headers = { ETag = new EntityTagHeaderValue("\"2\"") }
});
Mock.Expect(HttpMethod.Put, "http://localhost/endpoint")
.WithContent("{\"id\":5,\"name\":\"testX\"}")
.WithHeaders("If-Match", "\"2\"")
.Respond(HttpStatusCode.NoContent);
await _endpoint.UpdateAsync(x => x.Name = "testX");
}
/// <summary>
/// Applies a JSON Patch to the entity. Sends the patch instructions to the server for processing; falls back to local processing with optimistic concurrency if that fails.
/// </summary>
/// <typeparam name="TEntity">The type of entity the endpoint represents.</typeparam>
/// <param name="endpoint">The endpoint representing the entity.</param>
/// <param name="patchAction">Callback for building a patch document describing the desired modifications.</param>
/// <param name="maxRetries">The maximum number of retries to perform for optimistic concurrency before giving up.</param>
/// <param name="cancellationToken">Used to cancel the request.</param>
/// <returns>The <typeparamref name="TEntity"/> as returned by the server, possibly with additional fields set. <c>null</c> if the server does not respond with a result entity.</returns>
/// <exception cref="NotSupportedException"><see cref="IEndpoint.Serializer"/> is not a <see cref="JsonMediaTypeFormatter"/>.</exception>
/// <exception cref="InvalidDataException"><see cref="HttpStatusCode.BadRequest"/></exception>
/// <exception cref="AuthenticationException"><see cref="HttpStatusCode.Unauthorized"/></exception>
/// <exception cref="UnauthorizedAccessException"><see cref="HttpStatusCode.Forbidden"/></exception>
/// <exception cref="KeyNotFoundException"><see cref="HttpStatusCode.NotFound"/> or <see cref="HttpStatusCode.Gone"/></exception>
/// <exception cref="InvalidOperationException">The number of retries performed for optimistic concurrency exceeded <paramref name="maxRetries"/>.</exception>
/// <exception cref="HttpRequestException">Other non-success status code.</exception>
public static async Task <TEntity> UpdateAsync <TEntity>(this IElementEndpoint <TEntity> endpoint, Action <JsonPatchDocument <TEntity> > patchAction, int maxRetries = 3, CancellationToken cancellationToken = default)
where TEntity : class
{
if (!(endpoint.Serializer is JsonMediaTypeFormatter serializer))
{
throw new NotSupportedException($"JSON Patch can only be used if the endpoint's serializer is a {nameof(JsonMediaTypeFormatter)}.");
}
var patch = new JsonPatchDocument <TEntity>(new List <Operation <TEntity> >(), serializer.SerializerSettings.ContractResolver);
patchAction(patch);
var response = await endpoint.HttpClient.SendAsync(new HttpRequestMessage(HttpMethods.Patch, endpoint.Uri)
{
Content = new StringContent(JsonConvert.SerializeObject(patch))
{
Headers = { ContentType = new MediaTypeHeaderValue("application/json-patch+json") }
}
}, cancellationToken).NoContext();
if (response.StatusCode == HttpStatusCode.NotFound || response.StatusCode == HttpStatusCode.MethodNotAllowed)
{
return(await endpoint.UpdateAsync(patch.ApplyTo, maxRetries, cancellationToken));
}
if (!response.IsSuccessStatusCode)
{
await endpoint.ErrorHandler.HandleAsync(response).NoContext();
}
return(response.Content == null
? default
: await response.Content.ReadAsAsync <TEntity>(endpoint.Serializer, cancellationToken));
}