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00-.383-3.22 4.169 4.169.0 00-1.457-2.243 4.066 4.066.0 00-2.531-.785 3.942 3.942.0 00-2.453.785 4.376 4.376.0 00-1.5 2.243 11.839 11.839.0 00-.383 3.22 11.84 11.84.0 00.383 3.221 4.222 4.222.0 001.476 2.262 4.075 4.075.0 002.549.8 3.8 3.8.0 002.44-.809z"/><path d="m15.105 32.057v15.565a.059.059.0 01-.049.059L.069 50.25A.06.06.0 01.005 50.167l14.987-33.47a.06.06.0 01.114.025z"/><path d="m17.631 23.087v24.6a.06.06.0 00.053.059l22.449 2.507a.06.06.0 00.061-.084L17.745.032a.06.06.0 00-.114.024z"/><path d="m39.961 52.548-24.833 7.45a.062.062.0 01-.043.0L.079 52.548a.059.059.0 01.026-.113h39.839a.06.06.0 01.017.113z"/></svg></span></a><button id=hamburger class=main-navigation-toggle aria-label="Open navigation"><svg class="icon menu-hamburger"><use xlink:href="/v1.10/img/icons.svg#menu-hamburger"/></svg></button>
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<button id=menu-close class=main-navigation-toggle aria-label="Close navigation"><svg class="icon menu-close"><use xlink:href="/v1.10/img/icons.svg#menu-close"/></svg></button></div><div id=header-links class=main-navigation-links-wrapper><ul class=main-navigation-links><li class=main-navigation-links-item><a class="main-navigation-links-link has-dropdown"><span>关于</span><svg class="icon dropdown-arrow"><use xlink:href="/v1.10/img/icons.svg#dropdown-arrow"/></svg></a><ul class=main-navigation-links-dropdown><li class=main-navigation-links-dropdown-item><a href=/v1.10/zh/about/service-mesh class=main-navigation-links-link>服务网格</a></li><li class=main-navigation-links-dropdown-item><a href=/v1.10/zh/about/solutions class=main-navigation-links-link>解决方案</a></li><li class=main-navigation-links-dropdown-item><a href=/v1.10/zh/about/case-studies class=main-navigation-links-link>案例学习</a></li><li class=main-navigation-links-dropdown-item><a href=/v1.10/zh/about/ecosystem class=main-navigation-links-link>生态系统</a></li><li class=main-navigation-links-dropdown-item><a href=/v1.10/zh/about/deployment class=main-navigation-links-link>部署</a></li><li class=main-navigation-links-dropdown-item><a href=/v1.10/zh/about/faq class=main-navigation-links-link>FAQ</a></li></ul></li><li class=main-navigation-links-item><a href=/v1.10/zh/blog/ class=main-navigation-links-link><span>博客</span></a></li><li class=main-navigation-links-item><a href=/v1.10/zh/news/ class=main-navigation-links-link><span>新闻</span></a></li><li class=main-navigation-links-item><a href=/v1.10/zh/get-involved/ class=main-navigation-links-link><span>加入我们</span></a></li><li class=main-navigation-links-item><a href=/v1.10/zh/docs/ class=main-navigation-links-link><span>文档</span></a></li></ul><div class=main-navigation-footer><button id=search-show class=search-show title="搜索 istio.io" aria-label=搜索><svg class="icon magnifier"><use xlink:href="/v1.10/img/icons.svg#magnifier"/></svg></button>
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<a href=/v1.10/zh/docs/setup/getting-started class="btn btn--primary" id=try-istio>试用 Istio</a></div></div><form id=search-form class=search name=cse role=search><input type=hidden name=cx value=002184991200833970123:iwwf17ikgf4>
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<input type=hidden name=ie value=utf-8>
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<input type=hidden name=hl value=zh>
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<input type=hidden id=search-page-url value=/zh/search>
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<input id=search-textbox class="search-textbox form-control" name=q type=search aria-label="搜索 istio.io" placeholder=搜索>
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<button id=search-close title=取消搜索 type=reset aria-label=取消搜索><svg class="icon menu-close"><use xlink:href="/v1.10/img/icons.svg#menu-close"/></svg></button></form></nav></header><div class=banner-container></div><article class=post itemscope itemtype=http://schema.org/BlogPosting><div class=header-content><h1>Istio client-go 发布公告</h1><p>正式启用访问 Istio 资源。</p></div><p class=post-author>Nov 14, 2019 <span>|</span> By Neeraj Poddar - Aspen Mesh</p><div><p>我们很高兴地宣布 <a href=https://github.com/istio/client-go>Istio client go</a> 的第一个版本发布了，该存储库使开发人员能够在 <code>Kubernetes</code> 环境中访问 <code>Istio API</code> 。在此存储库中的 <code>Kubernetes</code> 程序和客户端使开发人员可以轻松地为所有 <code>Istio</code> 客户端自定义的资源 <code>(CRDs)</code> 创建，读取，更新和删除 <code>(CRUD)</code>。</p><p>这是许多 Istio 用户强烈要求的功能，从 <a href=https://github.com/aspenmesh/istio-client-go>Aspen Mesh</a>
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和 <a href=https://github.com/knative/pkg>Knative project</a> 项目对客户端产生的功能请求中可以明显地看出这一点。如果您正在使用上述客户端之一，则可以像如下这样轻松地切换到 <a href=https://github.com/istio/client-go>Istio client go</a>：</p><pre><code class=language-go data-expandlinks=true data-repo=istio>import (
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...
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- versionedclient "github.com/aspenmesh/istio-client-go/pkg/client/clientset/versioned"
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+ versionedclient "istio.io/client-go/pkg/clientset/versioned"
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)
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</code></pre><p>由于生成的客户端在功能上是等效的，因此使用新的 <code>istio-client-go</code> 也不会有什么问题。</p><h2 id=how-to-use-client-go>如何使用客户端</h2><p><a href=https://github.com/istio/client-go>Istio client go</a> 存储库遵循与 <a href=https://github.com/istio/api>Istio API</a> 存储库 相同的分支策略，因为客户端存储库取决于 <code>API</code> 定义。如果要使用稳定的客户端，则可以在 <a href=https://github.com/istio/client-go>client go</a> 存储库中使用发行版分支或标记的版本。使用客户端与使用 <a href=https://github.com/kubernetes/client-go>Kubernetes client go</a> 非常相似，这是一个使用客户端列出命名空间中所有 <a href=/v1.10/zh/docs/reference/config/networking/virtual-service>Istio
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virtual services</a> 的简单示例：</p><pre><code class=language-go data-expandlinks=true data-repo=istio>package main
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import (
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"log"
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"os"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/client-go/tools/clientcmd"
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versionedclient "istio.io/client-go/pkg/clientset/versioned"
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)
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func main() {
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kubeconfig := os.Getenv("KUBECONFIG")
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namespace := os.Getenv("NAMESPACE")
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if len(kubeconfig) == 0 || len(namespace) == 0 {
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log.Fatalf("Environment variables KUBECONFIG and NAMESPACE need to be set")
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}
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restConfig, err := clientcmd.BuildConfigFromFlags("", kubeconfig)
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if err != nil {
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log.Fatalf("Failed to create k8s rest client: %s", err)
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}
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ic, err := versionedclient.NewForConfig(restConfig)
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if err != nil {
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log.Fatalf("Failed to create istio client: %s", err)
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}
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// Print all VirtualServices
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vsList, err := ic.NetworkingV1alpha3().VirtualServices(namespace).List(metav1.ListOptions{})
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if err != nil {
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log.Fatalf("Failed to get VirtualService in %s namespace: %s", namespace, err)
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}
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for i := range vsList.Items {
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vs := vsList.Items[i]
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log.Printf("Index: %d VirtualService Hosts: %+v\n", i, vs.Spec.GetHosts())
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}
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}
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</code></pre><p>您可以在<a href=https://github.com/istio/client-go/blob/release-1.10/cmd/example/client.go>这里</a>找到更详尽的示例。</p><h2 id=useful-tools-created-for-generating-Istio-client-go>为生成 Istio client go 而创建的工具</h2><p>如果您想知道为什么花费大量时间也很难生成此客户端，本小节将对此进行说明。在 <code>Istio</code> 中，我们使用 <a href=https://developers.google.com/protocol-buffers>protobuf</a> 规范编写 <code>API</code>，然后使用 <code>protobuf</code> 工具链将其转换为 <code>Go</code> 定义。如果尝试从 <code>protobuf</code> 的 <code>API</code> 生成 <code>Kubernetes</code> 客户端，可能会面临三个主要的挑战：</p><ul><li><p><strong>创建 Kubernetes 装饰器类型</strong> - Kubernetes <a href=https://github.com/kubernetes/code-generator/tree/master/cmd/client-gen>客户端生成库</a>
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仅适用于遵循 <code>Kubernetes</code> 对象规范的 <code>Go</code> 对象，例如：<a href=https://github.com/istio/client-go/blob/release-1.10/pkg/apis/authentication/v1alpha1/types.gen.go>Authentication Policy Kubernetes Wrappers</a>。这意味着对于需要程序访问的每个 API，您都需要创建这些装饰器。此外，每个 <code>CRD</code> 组，版本和种类都需要大量的样板，需要用客户端代码生成。为了自动化该过程，我们创建了一个 <a href=https://github.com/istio/tools/tree/master/cmd/kubetype-gen>Kubernetes type
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generator</a> 工具，可以基于注释去自动创建 <code>Kubernetes</code>类型。该工具的注释和各种可用选项在 <a href=https://github.com/istio/tools/blob/master/cmd/kubetype-gen/README.md>README</a> 中进行了说明。请注意，如果您使用 <code>protobuf</code> 工具生成 <code>Go</code> 类型，则需要将这些注释添加到 <code>proto</code> 文件中，以便注释出现在生成的 <code>Go</code> 文件中，然后供该工具使用。</p></li><li><p><strong>生成 deep copy 方法</strong> - 在 <code>Kubernetes</code> 客户端机制中，如果您想对从客户端集返回的任何对象进行修改，则需要创建该对象的副本以防止直接修改缓存中的对象。为了不直接修改缓存中的对象，我们一般是在所有嵌套类型上创建一个 <code>deep copy</code> 方法。我们开发了一个 <a href=https://github.com/istio/tools/tree/master/cmd/protoc-gen-deepcopy>protoc deep copy
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generator</a> 工具 ，该工具是一个 <code>protoc</code> 插件，可以使用 <a href=https://godoc.org/github.com/golang/protobuf/proto#Clone>Proto
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Clone</a> 库上的注释自动创建 <code>deepcopy</code> 方法。这是一个生成了 <code>deepcopy</code> 方法的<a href=https://github.com/istio/api/blob/release-1.10/authentication/v1alpha1/policy_deepcopy.gen.go>示例</a>。</p></li><li><p><strong>类型和 JSON 的互相转换</strong> - 对于从 <code>proto</code> 定义生成的类型，使用默认的 <code>Go JSON</code> 编码器或解码器通常会出现问题，因为像 <code>protobuf</code> 的 <code>oneof</code> 这类字段需要进行特殊处理。另外，名称中带有下划线的任何 <code>Proto</code> 字段都可以序列化或反序列化为不同的字段名称，具体取决于编码器/解码器，因为 <code>Go</code> 结构体的标记方式<a href=https://github.com/istio/istio/issues/17600>不同</a>。始终建议使用 <code>protobuf</code> 原语对 <code>JSON</code> 进行序列化或反序列化，而不是依赖默认的 <code>Go</code> 库。我们创建了一个 <a href=https://github.com/istio/tools/tree/master/cmd/protoc-gen-jsonshim>protoc JSON shim</a> 工具，它是一个 <code>protoc</code> 插件，可以为从 <code>Proto</code> 定义所有 <code>Go</code> 类型自动创建的 <code>Marshalers</code> 或 <code>Unmarshalers</code>。这是用此工具生成代码的一个<a href=https://github.com/istio/api/blob/release-1.10/authentication/v1alpha1/policy_json.gen.go>示例</a>。</p></li></ul><p>我们希望新发布的客户端使用户能够为 <code>Istio API</code> 创建更多的 <code>integrations</code> 和 <code>controllers</code>，并且开发人员可以使用上述工具从 <code>Proto API</code> 生成 <code>Kubernetes</code> 客户端。</p></div><nav class=pagenav><div class=left><a title="在 Istio 中配置和管理 DNS 证书。" href=/v1.10/zh/blog/2019/dns-cert/ class=next-link><svg class="icon left-arrow"><use xlink:href="/v1.10/img/icons.svg#left-arrow"/></svg>DNS 证书管理</a></div><div class=right><a title="关于 Istio 基于 operator 的安装和控制平面管理特性的介绍。" href=/v1.10/zh/blog/2019/introducing-istio-operator/ class=next-link>Istio Operator 简介<svg class="icon right-arrow"><use xlink:href="/v1.10/img/icons.svg#right-arrow"/></svg></a></div></nav></article><footer class=footer><div class="footer-wrapper container-l"><div class="user-links footer-links"><a class=channel title="Istio 的代码在 GitHub 上开发" href=https://github.com/istio/community aria-label=GitHub><svg 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