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| <a href="../config/read-config.html" class="md-nav__link"> |
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| 在程序中读取配置信息 |
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| <a href="../config/kie.html" class="md-nav__link"> |
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| <a href="../config/nacos.html" class="md-nav__link"> |
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| <a href="../config/apollo.html" class="md-nav__link"> |
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| <span class="md-ellipsis"> |
| 使用Apollo |
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| 使用CSE1.0配置中心 |
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| 服务治理功能参考 |
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| <nav class="md-nav" data-md-level="1" aria-labelledby="__nav_14_label" aria-expanded="false"> |
| <label class="md-nav__title" for="__nav_14"> |
| <span class="md-nav__icon md-icon"></span> |
| 服务治理功能参考 |
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| <ul class="md-nav__list" data-md-scrollfix> |
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| 流量特征治理 |
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| 负载均衡 |
| </span> |
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| 限流 |
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| 灰度发布 |
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| 故障注入 |
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| 快速失败和重试 |
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| <span class="md-ellipsis"> |
| 网关功能参考 |
| </span> |
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| <span class="md-nav__icon md-icon"></span> |
| </label> |
| |
| <nav class="md-nav" data-md-level="1" aria-labelledby="__nav_15_label" aria-expanded="false"> |
| <label class="md-nav__title" for="__nav_15"> |
| <span class="md-nav__icon md-icon"></span> |
| 网关功能参考 |
| </label> |
| <ul class="md-nav__list" data-md-scrollfix> |
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| <li class="md-nav__item"> |
| <a href="../edge/open-service.html" class="md-nav__link"> |
| |
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| <span class="md-ellipsis"> |
| 介绍 |
| </span> |
| |
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| </a> |
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| <li class="md-nav__item"> |
| <a href="../edge/by-servicecomb-sdk.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| 使用 Edge Service 做网关 |
| </span> |
| |
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| </a> |
| </li> |
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| <li class="md-nav__item"> |
| <a href="../edge/zuul.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| 使用 `zuul` 和 `spring cloud gateway` 做网关 |
| </span> |
| |
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| </a> |
| </li> |
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| <li class="md-nav__item"> |
| <a href="../edge/nginx.html" class="md-nav__link"> |
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| <span class="md-ellipsis"> |
| nginx 网关简单介绍 |
| </span> |
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| <label class="md-nav__link" for="__nav_16" id="__nav_16_label" tabindex="0"> |
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| <span class="md-ellipsis"> |
| 安全特性参考 |
| </span> |
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| <span class="md-nav__icon md-icon"></span> |
| </label> |
| |
| <nav class="md-nav" data-md-level="1" aria-labelledby="__nav_16_label" aria-expanded="false"> |
| <label class="md-nav__title" for="__nav_16"> |
| <span class="md-nav__icon md-icon"></span> |
| 安全特性参考 |
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| <ul class="md-nav__list" data-md-scrollfix> |
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| <a href="../references-handlers/publickey.html" class="md-nav__link"> |
| |
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| <span class="md-ellipsis"> |
| 公钥认证 |
| </span> |
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| <li class="md-nav__item"> |
| <a href="../security/tls.html" class="md-nav__link"> |
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| <span class="md-ellipsis"> |
| 使用TLS通信 |
| </span> |
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| <a href="../security/shi-yong-rsa-ren-zheng.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| 使用RSA认证 |
| </span> |
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| </a> |
| </li> |
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| </nav> |
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| 专题文章 |
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| <span class="md-nav__icon md-icon"></span> |
| </label> |
| |
| <nav class="md-nav" data-md-level="1" aria-labelledby="__nav_17_label" aria-expanded="false"> |
| <label class="md-nav__title" for="__nav_17"> |
| <span class="md-nav__icon md-icon"></span> |
| 专题文章 |
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| <ul class="md-nav__list" data-md-scrollfix> |
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| <a href="../featured-topics/features.html" class="md-nav__link"> |
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| <span class="md-ellipsis"> |
| 特性介绍 |
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| <a href="../featured-topics/compatibility.html" class="md-nav__link"> |
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| 兼容问题和兼容性策略 |
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| 常用配置项参考 |
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| <nav class="md-nav" data-md-level="1" aria-labelledby="__nav_18_label" aria-expanded="false"> |
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| 常见问题 |
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| <span class="md-nav__icon md-icon"></span> |
| </label> |
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| <div class="md-content" data-md-component="content"> |
| <article class="md-content__inner md-typeset"> |
| |
| |
| |
| |
| <h1 id="context">使用 Context 参数</h1> |
| <p>Context 参数指在接口声明中的特殊参数，这些参数信息不会出现在最终的契约信息中，开发者可以使用 Context 参数 |
| 获取或者传递与运行时有关的信息。 </p> |
| <ul> |
| <li>HttpServletRequest</li> |
| </ul> |
| <p>HttpServletRequest 用于获取和HTTP请求有关的信息，比如 header 等。当 servicecomb 运行于 <code>Highway</code> |
| 协议，或者运行于 <code>vert.x</code> 服务器之上的时候，仍然可以使用。 但是需要注意，和 JSP/Servlet 协议标准的实现 |
| 不同， 开发者无法通过 HttpServletRequest 操作流，只能够进行一些简单的获取 header 等操作。比如下面的例子， |
| 获取 query 参数：</p> |
| <pre><code> ```java |
| @GetMapping(path = "/reduce") |
| @ApiImplicitParams({@ApiImplicitParam(name = "a", dataType = "integer", format = "int32", paramType = "query")}) |
| public int reduce(HttpServletRequest request, @CookieValue(name = "b") int b) { |
| int a = Integer.parseInt(request.getParameter("a")); |
| return a - b; |
| } |
| ``` |
| </code></pre> |
| <p>特别需要注意，如果请求不是直接到达 provider， 而是经过 servicecomb 的 Edge Service 转发到 provider， |
| 上面的代码还必须使用 <code>@ApiImplicitParams</code> 显示的声明这个接口的实现通过 <code>HttpServletRequest</code> 读取了 |
| query 参数 <code>a</code>， 如果不声明， Edge Service 做请求转发的时候，不会转发参数 <code>a</code>， 代码中读取的参数值为 |
| null。</p> |
| <p>还需要注意，servicecomb 不支持 <code>HttpServletResponse</code> Context 参数。</p> |
| <ul> |
| <li>InvocationContext</li> |
| </ul> |
| <p>InvocationContext 是 servicecomb 特有的上下文信息，可以在 <code>Handler</code>, <code>HttpServerFilter</code> 等 |
| 多种场景使用。 InvocationContext 包含 local 和 context 两种数据， local 数据只在本进程的模块间 |
| 传递， context 数据可以在微服务之间传递。 </p> |
| <pre><code> ```java |
| @ApiResponse(code = 202, response = User.class, message = "") |
| @ResponseHeaders({@ResponseHeader(name = "h1", response = String.class), |
| @ResponseHeader(name = "h2", response = String.class)}) |
| @RequestMapping(path = "/cseResponseCorrect", method = RequestMethod.GET) |
| public Response cseResponseCorrect(InvocationContext c1) { |
| Response response = Response.createSuccess(Status.ACCEPTED, new User()); |
| Headers headers = response.getHeaders(); |
| headers.addHeader("h1", "h1v " + c1.getContext().get(Const.SRC_MICROSERVICE)); |
| |
| InvocationContext c2 = ContextUtils.getInvocationContext(); |
| headers.addHeader("h2", "h2v " + c2.getContext().get(Const.SRC_MICROSERVICE)); |
| |
| return response; |
| } |
| ``` |
| </code></pre> |
| <p>上面的代码显示了 InvocationContext 参数的用法， 这个用法和代码中通过 ContextUtils.getInvocationContext() |
| 获取是等价的。</p> |
| <p>InvocationContext 还可以在 consumer 端的 RPC 接口中使用， <a href="../general-development/context.html">使用Context传递控制消息</a> 描述了更多 InvocationContext 的使用 |
| 场景。</p> |
| <ul> |
| <li>Endpoint</li> |
| </ul> |
| <p>Endpoint 描述当前请求需要发往的实例地址。 这个 context 参数只能够在 consumer 端的 PRC 接口使用。当 |
| 微服务存在多个实例的时候，可以使用这种方式指定将请求发往哪个实例。 </p> |
| <pre><code> ```java |
| public interface SchemaDiscoveryService { |
| String getSchema(Endpoint endpoint, String schemaId); |
| } |
| |
| SchemaDiscoveryService schemaDiscoveryService = Invoker |
| .createProxy(serviceName, SchemaDiscoveryService.SCHEMA_ID, |
| SchemaDiscoveryService.class); |
| |
| schemaDiscoveryService.getSchema(EndpointUtils.parse(endpoint), schemaId); |
| ``` |
| </code></pre> |
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