[译]Ocelot - Quality of Service

原文可以针对每个ReRoute设置对下游服务的熔断器circuit breaker.这部分是通过Polly实现的. 将下面的配置添加到一个ReRoute下面去. "QoSOptions": { "ExceptionsAllowedBeforeBreaking":3, "DurationOfBreak":5, "TimeoutValue":5000 } ExceptionsAllowedBeforeBreaking必须大于0.…

[译]Ocelot - Big Picture

原文目录 Big Picture Getting Started Configuration Routing Request Aggregation Service Discovery Authentication TODO Authorisation TODO Rate Limiting Caching Quality of Service Headers Transformation Claims Transformation Logging Tracing Request Id / Co…

[转] Quality Of Service In OpenStack

http://tropicaldevel.wordpress.com/2013/07/15/quality-of-service-in-openstack/ In this post I will be exploring the current state of quality of service (QoS) in OpenStack. I will be looking at both what is possible now and what is on the horizon and…

Quality of Service 0, 1 & 2

来自:http://www.hivemq.com/blog/mqtt-essentials-part-6-mqtt-quality-of-service-levels Quality of Service What is Quality of Service? The Quality of Service (QoS) level is an agreement between sender and receiver of a message regarding the guarantees of…

MQTT协议QoS服务质量（Quality of Service 0, 1 & 2）概念学习

什么是 QoS ? QoS (Quality of Service) 是发送者和接收者之间,对于消息传递的可靠程度的协商. QoS 的设计是 MQTT 协议里的重点.作为专为物联网场景设计的协议,MQTT 的运行场景不仅仅是 PC,而是更广泛的窄带宽网络和低功耗设备,如果能在协议层解决传输质量的问题,将为物联网应用的开发提供极大便利. 三个 QoS 级别简介在 MQTT 协议里,定义了三个级别的 QoS,由低到高分别是: 最多一次 (QoS0) 至少一次 (QoS1) 有且仅有一次 (QoS2…

Quality of service

w https://en.wikipedia.org/wiki/Quality_of_service Quality of service (QoS) is the overall performance of a telephony or computer network, particularly the performance seen by the users of the network. To quantitatively measure quality of service, se…

neutron qos Quality of Service

Quality of Service advanced service is designed as a service plugin. The service is decoupled from the rest of Neutron code on multiple levels (see below). QoS extends core resources (ports, networks) without using mixins inherited from plugins but t…

[译]Ocelot - Service Discovery

原文你可以指定一个service discovery provider,ocelot将使用它来找下游的host和port. Consul 下面的配置要放在GlobalConfiguration中.如果你没有指定host和port,那么就需要一个service discovery provider,默认使用的是Consul. "ServiceDiscoveryProvider": { "Host": "localhost", "Port…

[译]Ocelot - Request Aggregation

原文 Aggregate ReRoutes用来组合多个ReRoutes,将它们的响应结果映射到一个响应中返回给客户端. 为了使用Aggregate ReRoutes,你必须像下面的ocelot.json中做些配置. 在下面的例子中,有两个ReRoutes,且它们都有一个Key属性,我们将使用ReRoute里面的key在Aggregate中组合ReRoute.Aggregate 和 ReRoutes的UpstreamPathTemplate不能重复.Aggregate可以使用ReRoute中出了R…

[译]Ocelot - Load Balancer

原文可以对下游的服务进行负载均衡. 提供了下面几种负载均衡: LeastConnection - tracks which services are dealing with requests and sends new requests to service with least existing requests. The algorythm state is not distributed across a cluster of Ocelot's. RoundRobin - loops…

[译]Ocelot - Tracing

原文 Ocelot是使用的Butterfly这个项目来实现这个的. 在ocelot要使用tracing, 首先得安装相应的包: Install-Package Ocelot.Tracing.Butterfly 然后再ConfigureServices方法里面添加如下代码: services .AddOcelot() // 下面这个扩展方法来自Ocelot.Tracing.Butterfly包 .AddButterfly(option => { // 这个是butterfly服务器的地址 opti…

[译]Ocelot - Caching

原文 Ocelot支持基本的缓存,目前Ocelot的缓存是通过CacheManager project实现的. 下面的示例展示了如何启用缓存: s.AddOcelot() .AddCacheManager(x => { x.WithDictionaryHandle(); }) 为了在路由中使用缓存,需要在ReRoute中添加下面的配置: "FileCacheOptions": { "TtlSeconds": 15, "Region": &q…

[译]Ocelot - Rate Limiting

原文 Ocelot支持对上游做访问限流,这样就可以保证下游不要负载太大了. 如果要启用访问限流,需要做如下配置: "RateLimitOptions": { "ClientWhitelist": [], "EnableRateLimiting": true, "Period": "1s", "PeriodTimespan": 1, "Limit": 1 } Clien…

[译]Ocelot - Getting Started

原文 Ocelot专为.NET Core而设计. .NET Core 2.1 安装首先需要创建一个netstandard2.0项目,然后再通过nuget安装. Install-Package Ocelot Configuration 下面是个最基本的最简单的ocelot.json文件的内容. { "ReRoutes": [], "GlobalConfiguration": { "BaseUrl": "https://api.mybus…

[译]Ocelot - Configuration

原文这里有一个配置的样例.配置主要有两个部分.一个是ReRoutes数组,另一个是GlobalConfiguration.ReRoute告诉Ocelot怎么处理上游的请求.Global configuration能让我们覆盖一些ReRoute的一些配置. { "ReRoutes": [], "GlobalConfiguration": {} } 这里是一个ReRoutes的配置样例(你不需要设置下面所有的配置): { "DownstreamPathTem…

[译]Ocelot - Routing

原文 Ocelot主要的功能就是将http请求转发到对应的下游服务上去. Ocelot将一个请求路由到另外一个路由的动作叫做ReRoute.为了能让Ocelot能正常工作,需要在配置中设置ReRoute. { "ReRoutes": [ ] } 配置ReRoute需要添加一个ReRoutes json 数组. { "DownstreamPathTemplate": "/api/posts/{postId}", "DownstreamSc…

[译]Ocelot - Delegating Handlers

原文可以为HttpClient添加delegating handlers. Usage 为了添加delegating handler需要做两件事. 首先如下一样创建一个类. public class FakeHandler : DelegatingHandler { protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancell…

[译]Ocelot - Request Id / Correlation Id

原文 Ocelot可以通过header的形式发送一个requestid.ocelot会将这个requestid转发到下游服务. 如果在日志配置中设置了IncludeScopes为true,那么request id会打在日志里面. 可以通过两种方式使用requestid. 1.Global - 配置如下GlobalConfiguration.这将作用于所有的请求 "GlobalConfiguration": { "RequestIdKey": "OcRequ…

[译]Ocelot - Logging

原文 Ocelot使用标准的日志接口ILoggerFactory和ILogger<T>.它们封装在IOcelotLogger 和 IOcelotLoggerFactory中,因为ocelot要添加一些额外的信息(eg:request id)到日志中去. 还有一个内置的全局error handler,用来捕获异常并打日志. 如果日志级别设置为trace, ocelot将log starting, finishing和任何中间件抛出的异常. Warning 如果日志是设置输出到Console的,那…

[译]Ocelot - Claims Transformation

原文用户授权后才能使用此功能. 用户获得授权后claims将被发送到claims transformation中间件.用户授权后,我们首先调用claims to headers middleware,claims to query string parameters middleware. 在ReRoute配置中添加名为AddClaimsToRequest, AddHeadersToRequest, AddQueriesToRequest的字典信息. 字典的条目标识ocelot将怎么转换,键会…

[译]Ocelot - Headers Transformation

原文 Add to Request 为上游请求添加请求头,只需如下一样将下面的配置添加到一个ReRoute里: "UpstreamHeaderTransform": { "Uncle": "Bob" } 上面的例子中添加了一个键为Uncle,值为Bob的请求头. 支持Placeholders. Add to Response 还可以为下游服务添加响应头, 如下一样将下面的配置添加到一个ReRoute里: "DownstreamHeade…

Quality of Service (QoS) in LTE

Background: Why we need QoS ? There are premium subscribers who always want to have better user experience on their 4G LTE device. These users are willing to pay more for high bandwidth and better network access on their devices. Not only the subscri…