en/docs3-v2/golang-sdk/tutorial/develop/protocol/index.xml

<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>Apache Dubbo – Protocol Configuration</title><link>https://dubbo.apache.org/en/docs3-v2/golang-sdk/tutorial/develop/protocol/</link><description>Recent content in Protocol Configuration on Apache Dubbo</description><generator>Hugo -- gohugo.io</generator><language>en</language><atom:link href="https://dubbo.apache.org/en/docs3-v2/golang-sdk/tutorial/develop/protocol/index.xml" rel="self" type="application/rss+xml"/><item><title>Docs3-V2: Triple exception return</title><link>https://dubbo.apache.org/en/docs3-v2/golang-sdk/tutorial/develop/protocol/exception_response/</link><pubDate>Mon, 01 Jan 0001 00:00:00 +0000</pubDate><guid>https://dubbo.apache.org/en/docs3-v2/golang-sdk/tutorial/develop/protocol/exception_response/</guid><description>
&lt;p>Refer to samples &lt;a href="https://github.com/apache/dubbo-go-samples/tree/master/error">dubbo-go-samples/error&lt;/a>&lt;/p>
&lt;h2 id="user-exception-return-introduction">User exception return introduction&lt;/h2>
&lt;p>The user can generate user-defined exception information on the provider side, and can record the exception generation stack. The triple protocol can ensure that the user can get the exception message on the client side, and can view the error stack, which is convenient for locating the problem.&lt;/p>
&lt;p>Note that when returning an error other than nil, the framework is not responsible for the delivery of other return values.&lt;/p>
&lt;ul>
&lt;li>An exception is returned on the Triple provider side, taking pb serialization as an example:&lt;/li>
&lt;/ul>
&lt;div class="highlight">&lt;pre tabindex="0" style="color:#93a1a1;background-color:#002b36;-moz-tab-size:4;-o-tab-size:4;tab-size:4;">&lt;code class="language-go" data-lang="go">&lt;span style="display:flex;">&lt;span>&lt;span style="color:#719e07">package&lt;/span> main
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#719e07">import&lt;/span> (
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#2aa198">&amp;#34;context&amp;#34;&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>)
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#719e07">import&lt;/span> (
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#2aa198">&amp;#34;dubbo.apache.org/dubbo-go/v3/common/logger&amp;#34;&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#586e75">// Use an exception library that can record battle information, here we take &amp;#34;github.com/pkg/errors&amp;#34; as an example
&lt;/span>&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">&lt;/span>&lt;span style="color:#2aa198">&amp;#34;github.com/pkg/errors&amp;#34;&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>)
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#719e07">import&lt;/span> (
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>triplepb &lt;span style="color:#2aa198">&amp;#34;github.com/apache/dubbo-go-samples/api&amp;#34;&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>)
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">// A service provider structure that implements the pb interface
&lt;/span>&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">&lt;/span>&lt;span style="color:#268bd2">type&lt;/span> ErrorResponseProvider &lt;span style="color:#268bd2">struct&lt;/span> {
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>triplepb. UnimplementedGreeterServer
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>}
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">// return error interface
&lt;/span>&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">&lt;/span>&lt;span style="color:#268bd2">func&lt;/span> (s &lt;span style="color:#719e07">*&lt;/span>ErrorResponseProvider) &lt;span style="color:#268bd2">SayHello&lt;/span>(ctx context.Context, in &lt;span style="color:#719e07">*&lt;/span>triplepb.HelloRequest) (&lt;span style="color:#719e07">*&lt;/span>triplepb.User, &lt;span style="color:#dc322f">error&lt;/span>) {
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>logger.&lt;span style="color:#268bd2">Infof&lt;/span>(&lt;span style="color:#2aa198">&amp;#34;Dubbo3 GreeterProvider get user name = %s\n&amp;#34;&lt;/span> &lt;span style="color:#719e07">+&lt;/span> in.Name)
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#586e75">// return user-defined exception
&lt;/span>&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">&lt;/span>&lt;span style="color:#719e07">return&lt;/span> &lt;span style="color:#719e07">&amp;amp;&lt;/span>triplepb.User{Name: &lt;span style="color:#2aa198">&amp;#34;Hello &amp;#34;&lt;/span> &lt;span style="color:#719e07">+&lt;/span> in.Name, Id: &lt;span style="color:#2aa198">&amp;#34;12345&amp;#34;&lt;/span>, Age: &lt;span style="color:#2aa198">21&lt;/span>}, errors.&lt;span style="color:#268bd2">New&lt;/span>(&lt;span style="color:#2aa198">&amp;#34;user defined error&amp;#34;&lt;/span>)
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>}
&lt;/span>&lt;/span>&lt;/code>&lt;/pre>&lt;/div>&lt;ul>
&lt;li>Client print exception and stack&lt;/li>
&lt;/ul>
&lt;div class="highlight">&lt;pre tabindex="0" style="color:#93a1a1;background-color:#002b36;-moz-tab-size:4;-o-tab-size:4;tab-size:4;">&lt;code class="language-go" data-lang="go">&lt;span style="display:flex;">&lt;span>&lt;span style="color:#719e07">package&lt;/span> main
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#719e07">import&lt;/span> (
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#2aa198">&amp;#34;context&amp;#34;&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>)
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#719e07">import&lt;/span> (
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#2aa198">&amp;#34;dubbo.apache.org/dubbo-go/v3/common/logger&amp;#34;&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#2aa198">&amp;#34;dubbo.apache.org/dubbo-go/v3/config&amp;#34;&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>_ &lt;span style="color:#2aa198">&amp;#34;dubbo.apache.org/dubbo-go/v3/imports&amp;#34;&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>tripleCommon &lt;span style="color:#2aa198">&amp;#34;github.com/dubbogo/triple/pkg/common&amp;#34;&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>)
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#719e07">import&lt;/span> (
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>triplepb &lt;span style="color:#2aa198">&amp;#34;github.com/apache/dubbo-go-samples/api&amp;#34;&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>)
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#268bd2">var&lt;/span> greeterProvider = &lt;span style="color:#b58900">new&lt;/span>(triplepb. GreeterClientImpl)
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#268bd2">func&lt;/span> &lt;span style="color:#268bd2">init&lt;/span>() {
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>config. &lt;span style="color:#268bd2">SetConsumerService&lt;/span>(greeterProvider)
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>}
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#268bd2">func&lt;/span> &lt;span style="color:#268bd2">main&lt;/span>() {
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#719e07">if&lt;/span> err &lt;span style="color:#719e07">:=&lt;/span> config.&lt;span style="color:#268bd2">Load&lt;/span>(); err &lt;span style="color:#719e07">!=&lt;/span> &lt;span style="color:#cb4b16">nil&lt;/span> {
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#b58900">panic&lt;/span>(err)
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>}
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>req &lt;span style="color:#719e07">:=&lt;/span> triplepb.HelloRequest{
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>Name: &lt;span style="color:#2aa198">&amp;#34;Laurence&amp;#34;&lt;/span>,
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>}
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#586e75">// initiate the call
&lt;/span>&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">&lt;/span>&lt;span style="color:#719e07">if&lt;/span> user, err &lt;span style="color:#719e07">:=&lt;/span> greeterProvider. &lt;span style="color:#268bd2">SayHello&lt;/span>(context. &lt;span style="color:#268bd2">TODO&lt;/span>(), &lt;span style="color:#719e07">&amp;amp;&lt;/span>req); err &lt;span style="color:#719e07">!=&lt;/span> &lt;span style="color:#cb4b16">nil&lt;/span> {
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#586e75">// Print the exception information, err.Error() will return a user-defined message, namely user defined error
&lt;/span>&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">&lt;/span>logger.&lt;span style="color:#268bd2">Infof&lt;/span>(&lt;span style="color:#2aa198">&amp;#34;response result: %v, error = %s&amp;#34;&lt;/span>, user, err)
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#586e75">// Print the exception stack, it needs to be asserted as tripleCommon.TripleError
&lt;/span>&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">&lt;/span>logger.&lt;span style="color:#268bd2">Infof&lt;/span>(&lt;span style="color:#2aa198">&amp;#34;error details = %+v&amp;#34;&lt;/span>, err.(tripleCommon.TripleError).&lt;span style="color:#268bd2">Stacks&lt;/span>())
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>}
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>}
&lt;/span>&lt;/span>&lt;/code>&lt;/pre>&lt;/div>&lt;div class="highlight">&lt;pre tabindex="0" style="color:#93a1a1;background-color:#002b36;-moz-tab-size:4;-o-tab-size:4;tab-size:4;">&lt;code class="language-text" data-lang="text">&lt;span style="display:flex;">&lt;span>2021-11-12T18:36:33.730+0800 INFO cmd/client.go:53 response result: , error = user defined error
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>2021-11-12T18:36:33.730+0800 INFO cmd/client.go:54 error details = [type.googleapis.com/google.rpc.DebugInfo]:{stack_entries:&amp;#34;user defined error
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>main.(*ErrorResponseProvider).SayHello
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> /dubbo-go-samples/error/triple/pb/go-server/cmd/error_reponse.go:40
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>reflect.Value.call
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> /usr/local/go/src/reflect/value.go:543
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>reflect.Value.Call
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> /usr/local/go/src/reflect/value.go:339
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>dubbo.apache.org/dubbo-go/v3/common/proxy/proxy_factory.(*ProxyInvoker).Invoke
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> /Users/laurence/go/pkg/mod/dubbo.apache.org/dubbo-go/v3@v3.0.0-rc4-1/common/proxy/proxy_factory/default.go:145
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> ...
&lt;/span>&lt;/span>&lt;/code>&lt;/pre>&lt;/div>&lt;p>You can see the error message and stack&lt;/p></description></item><item><title>Docs3-V2: exception information return</title><link>https://dubbo.apache.org/en/docs3-v2/golang-sdk/tutorial/develop/protocol/error/</link><pubDate>Mon, 01 Jan 0001 00:00:00 +0000</pubDate><guid>https://dubbo.apache.org/en/docs3-v2/golang-sdk/tutorial/develop/protocol/error/</guid><description>
&lt;h2 id="1-preparations">1. Preparations&lt;/h2>
&lt;ul>
&lt;li>dubbo-go cli tools and dependent tools have been installed&lt;/li>
&lt;li>Create a new demo application&lt;/li>
&lt;/ul>
&lt;h2 id="2-pass-exception-information">2. Pass exception information&lt;/h2>
&lt;p>Refer to samples &lt;a href="https://github.com/apache/dubbo-go-samples/tree/master/error">dubbo-go-samples/error&lt;/a>&lt;/p>
&lt;h3 id="user-exception-return-introduction">User exception return introduction&lt;/h3>
&lt;p>The user can generate user-defined exception information on the provider side, and can record the exception generation stack. The triple protocol can ensure that the user can get the exception message on the client side, and can view the error stack, which is convenient for locating the problem.&lt;/p>
&lt;p>Note that when returning an error other than nil, the framework is not responsible for the delivery of other return values.&lt;/p>
&lt;ul>
&lt;li>An exception is returned on the Triple provider side, taking pb serialization as an example:&lt;/li>
&lt;/ul>
&lt;div class="highlight">&lt;pre tabindex="0" style="color:#93a1a1;background-color:#002b36;-moz-tab-size:4;-o-tab-size:4;tab-size:4;">&lt;code class="language-go" data-lang="go">&lt;span style="display:flex;">&lt;span>&lt;span style="color:#719e07">package&lt;/span> main
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#719e07">import&lt;/span> (
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#2aa198">&amp;#34;context&amp;#34;&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>)
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#719e07">import&lt;/span> (
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#2aa198">&amp;#34;dubbo.apache.org/dubbo-go/v3/common/logger&amp;#34;&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#586e75">// Use an exception library that can record the stack, take &amp;#34;github.com/pkg/errors&amp;#34; as an example here
&lt;/span>&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">&lt;/span>&lt;span style="color:#2aa198">&amp;#34;github.com/pkg/errors&amp;#34;&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>)
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#719e07">import&lt;/span> (
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>triplepb &lt;span style="color:#2aa198">&amp;#34;github.com/apache/dubbo-go-samples/api&amp;#34;&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>)
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">// A service provider structure that implements the pb interface
&lt;/span>&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">&lt;/span>&lt;span style="color:#268bd2">type&lt;/span> ErrorResponseProvider &lt;span style="color:#268bd2">struct&lt;/span> {
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>triplepb. UnimplementedGreeterServer
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>}
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">// return error interface
&lt;/span>&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">&lt;/span>&lt;span style="color:#268bd2">func&lt;/span> (s &lt;span style="color:#719e07">*&lt;/span>ErrorResponseProvider) &lt;span style="color:#268bd2">SayHello&lt;/span>(ctx context.Context, in &lt;span style="color:#719e07">*&lt;/span>triplepb.HelloRequest) (&lt;span style="color:#719e07">*&lt;/span>triplepb.User, &lt;span style="color:#dc322f">error&lt;/span>) {
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>logger.&lt;span style="color:#268bd2">Infof&lt;/span>(&lt;span style="color:#2aa198">&amp;#34;Dubbo3 GreeterProvider get user name = %s\n&amp;#34;&lt;/span> &lt;span style="color:#719e07">+&lt;/span> in.Name)
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#586e75">// return user-defined exception
&lt;/span>&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">&lt;/span>&lt;span style="color:#719e07">return&lt;/span> &lt;span style="color:#719e07">&amp;amp;&lt;/span>triplepb.User{Name: &lt;span style="color:#2aa198">&amp;#34;Hello &amp;#34;&lt;/span> &lt;span style="color:#719e07">+&lt;/span> in.Name, Id: &lt;span style="color:#2aa198">&amp;#34;12345&amp;#34;&lt;/span>, Age: &lt;span style="color:#2aa198">21&lt;/span>}, errors.&lt;span style="color:#268bd2">New&lt;/span>(&lt;span style="color:#2aa198">&amp;#34;user defined error&amp;#34;&lt;/span>)
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>}
&lt;/span>&lt;/span>&lt;/code>&lt;/pre>&lt;/div>&lt;ul>
&lt;li>Client print exception and stack&lt;/li>
&lt;/ul>
&lt;div class="highlight">&lt;pre tabindex="0" style="color:#93a1a1;background-color:#002b36;-moz-tab-size:4;-o-tab-size:4;tab-size:4;">&lt;code class="language-go" data-lang="go">&lt;span style="display:flex;">&lt;span>&lt;span style="color:#719e07">package&lt;/span> main
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#719e07">import&lt;/span> (
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#2aa198">&amp;#34;context&amp;#34;&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>)
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#719e07">import&lt;/span> (
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#2aa198">&amp;#34;dubbo.apache.org/dubbo-go/v3/common/logger&amp;#34;&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#2aa198">&amp;#34;dubbo.apache.org/dubbo-go/v3/config&amp;#34;&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>_ &lt;span style="color:#2aa198">&amp;#34;dubbo.apache.org/dubbo-go/v3/imports&amp;#34;&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>tripleCommon &lt;span style="color:#2aa198">&amp;#34;github.com/dubbogo/triple/pkg/common&amp;#34;&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>)
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#719e07">import&lt;/span> (
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>triplepb &lt;span style="color:#2aa198">&amp;#34;github.com/apache/dubbo-go-samples/api&amp;#34;&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>)
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#268bd2">var&lt;/span> greeterProvider = &lt;span style="color:#b58900">new&lt;/span>(triplepb. GreeterClientImpl)
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#268bd2">func&lt;/span> &lt;span style="color:#268bd2">init&lt;/span>() {
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>config. &lt;span style="color:#268bd2">SetConsumerService&lt;/span>(greeterProvider)
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>}
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#268bd2">func&lt;/span> &lt;span style="color:#268bd2">main&lt;/span>() {
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#719e07">if&lt;/span> err &lt;span style="color:#719e07">:=&lt;/span> config.&lt;span style="color:#268bd2">Load&lt;/span>(); err &lt;span style="color:#719e07">!=&lt;/span> &lt;span style="color:#cb4b16">nil&lt;/span> {
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#b58900">panic&lt;/span>(err)
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>}
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>req &lt;span style="color:#719e07">:=&lt;/span> triplepb.HelloRequest{
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>Name: &lt;span style="color:#2aa198">&amp;#34;Laurence&amp;#34;&lt;/span>,
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>}
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#586e75">// initiate the call
&lt;/span>&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">&lt;/span>&lt;span style="color:#719e07">if&lt;/span> user, err &lt;span style="color:#719e07">:=&lt;/span> greeterProvider. &lt;span style="color:#268bd2">SayHello&lt;/span>(context. &lt;span style="color:#268bd2">TODO&lt;/span>(), &lt;span style="color:#719e07">&amp;amp;&lt;/span>req); err &lt;span style="color:#719e07">!=&lt;/span> &lt;span style="color:#cb4b16">nil&lt;/span> {
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#586e75">// Print the exception information, err.Error() will return a user-defined message, namely user defined error
&lt;/span>&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">&lt;/span>logger.&lt;span style="color:#268bd2">Infof&lt;/span>(&lt;span style="color:#2aa198">&amp;#34;response result: %v, error = %s&amp;#34;&lt;/span>, user, err)
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#586e75">// Print the exception stack, it needs to be asserted as tripleCommon.TripleError
&lt;/span>&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">&lt;/span>logger.&lt;span style="color:#268bd2">Infof&lt;/span>(&lt;span style="color:#2aa198">&amp;#34;error details = %+v&amp;#34;&lt;/span>, err.(tripleCommon.TripleError).&lt;span style="color:#268bd2">Stacks&lt;/span>())
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>}
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>}
&lt;/span>&lt;/span>&lt;/code>&lt;/pre>&lt;/div>&lt;div class="highlight">&lt;pre tabindex="0" style="color:#93a1a1;background-color:#002b36;-moz-tab-size:4;-o-tab-size:4;tab-size:4;">&lt;code class="language-text" data-lang="text">&lt;span style="display:flex;">&lt;span>2021-11-12T18:36:33.730+0800 INFO cmd/client.go:53 response result: , error = user defined error
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>2021-11-12T18:36:33.730+0800 INFO cmd/client.go:54 error details = [type.googleapis.com/google.rpc.DebugInfo]:{stack_entries:&amp;#34;user defined error
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>main.(*ErrorResponseProvider).SayHello
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> /dubbo-go-samples/error/triple/pb/go-server/cmd/error_reponse.go:40
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>reflect.Value.call
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> /usr/local/go/src/reflect/value.go:543
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>reflect.Value.Call
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> /usr/local/go/src/reflect/value.go:339
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>dubbo.apache.org/dubbo-go/v3/common/proxy/proxy_factory.(*ProxyInvoker).Invoke
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> /Users/laurence/go/pkg/mod/dubbo.apache.org/dubbo-go/v3@v3.0.0-rc4-1/common/proxy/proxy_factory/default.go:145
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> ...
&lt;/span>&lt;/span>&lt;/code>&lt;/pre>&lt;/div>&lt;p>You can see the error message and stack&lt;/p></description></item><item><title>Docs3-V2: Select the network protocol to use</title><link>https://dubbo.apache.org/en/docs3-v2/golang-sdk/tutorial/develop/protocol/choose_protocol/</link><pubDate>Mon, 01 Jan 0001 00:00:00 +0000</pubDate><guid>https://dubbo.apache.org/en/docs3-v2/golang-sdk/tutorial/develop/protocol/choose_protocol/</guid><description>
&lt;h1 id="modify-the-protocol-used">Modify the protocol used&lt;/h1>
&lt;h2 id="1-preparations">1. Preparations&lt;/h2>
&lt;ul>
&lt;li>dubbo-go cli tools and dependent tools have been installed&lt;/li>
&lt;li>Create a new demo application&lt;/li>
&lt;/ul>
&lt;h2 id="2-how-to-configure-the-network-protocol">2. How to configure the network protocol&lt;/h2>
&lt;p>As you can see in the Quick Start section, the generated Demo sets the Protocol to tri, indicating that the Triple protocol is used for service exposure and service invocation. The configuration API used in the quick start chapter writes the configuration, which has the advantage of not needing to use configuration files. We extract and explain the content related to the network protocol.&lt;/p>
&lt;h3 id="using-configuration-files">Using configuration files&lt;/h3>
&lt;p>See samples/helloworld&lt;/p>
&lt;ul>
&lt;li>The client uses a configuration file to set the network protocol&lt;/li>
&lt;/ul>
&lt;div class="highlight">&lt;pre tabindex="0" style="color:#93a1a1;background-color:#002b36;-moz-tab-size:4;-o-tab-size:4;tab-size:4;">&lt;code class="language-yaml" data-lang="yaml">&lt;span style="display:flex;">&lt;span>&lt;span style="color:#268bd2">dubbo&lt;/span>:
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#268bd2">consumer&lt;/span>:
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#268bd2">references&lt;/span>:
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#268bd2">GreeterClientImpl&lt;/span>:
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#268bd2">protocol&lt;/span>: tri &lt;span style="color:#586e75"># set protocol to tri&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#268bd2">interface&lt;/span>: com.apache.dubbo.sample.basic.IGreeter
&lt;/span>&lt;/span>&lt;/code>&lt;/pre>&lt;/div>&lt;ul>
&lt;li>The server uses the configuration file to set the network protocol&lt;/li>
&lt;/ul>
&lt;div class="highlight">&lt;pre tabindex="0" style="color:#93a1a1;background-color:#002b36;-moz-tab-size:4;-o-tab-size:4;tab-size:4;">&lt;code class="language-yaml" data-lang="yaml">&lt;span style="display:flex;">&lt;span>&lt;span style="color:#268bd2">dubbo&lt;/span>:
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#268bd2">protocols&lt;/span>:
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#268bd2">triple&lt;/span>: &lt;span style="color:#586e75"># define protocol-id &amp;#39;triple&amp;#39;&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#268bd2">name&lt;/span>: tri &lt;span style="color:#586e75"># set protocol to tri&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#268bd2">port&lt;/span>: &lt;span style="color:#2aa198">20000&lt;/span> &lt;span style="color:#586e75"># set port to be listened&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#268bd2">provider&lt;/span>:
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#268bd2">services&lt;/span>:
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#268bd2">GreeterProvider&lt;/span>:
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#268bd2">protocol-ids&lt;/span>: triple &lt;span style="color:#586e75"># use protocol-ids named &amp;#39;triple&amp;#39;&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#268bd2">interface&lt;/span>: com.apache.dubbo.sample.basic.IGreeter
&lt;/span>&lt;/span>&lt;/code>&lt;/pre>&lt;/div>&lt;h2 id="3-write-the-interface-and-implementation-of-dubbo-protocol">3. Write the interface and implementation of Dubbo protocol&lt;/h2>
&lt;h3 id="31-define-the-interface-and-transmission-structure-located-in-apiapigo">3.1 Define the interface and transmission structure, located in api/api.go&lt;/h3>
&lt;div class="highlight">&lt;pre tabindex="0" style="color:#93a1a1;background-color:#002b36;-moz-tab-size:4;-o-tab-size:4;tab-size:4;">&lt;code class="language-go" data-lang="go">&lt;span style="display:flex;">&lt;span>&lt;span style="color:#719e07">package&lt;/span> api
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#719e07">import&lt;/span> (
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#2aa198">&amp;#34;context&amp;#34;&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#2aa198">&amp;#34;dubbo.apache.org/dubbo-go/v3/config&amp;#34;&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>hessian &lt;span style="color:#2aa198">&amp;#34;github.com/apache/dubbo-go-hessian2&amp;#34;&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#2aa198">&amp;#34;time&amp;#34;&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>)
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">//1. Define the transmission structure. If Java intercommunication is required, the field needs to correspond to the Java side, and the first letter is capitalized
&lt;/span>&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">&lt;/span>&lt;span style="color:#268bd2">type&lt;/span> User &lt;span style="color:#268bd2">struct&lt;/span> {
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>ID &lt;span style="color:#dc322f">string&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>name &lt;span style="color:#dc322f">string&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>Age &lt;span style="color:#dc322f">int32&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>Time time. Time
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>}
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#268bd2">func&lt;/span> (u &lt;span style="color:#719e07">*&lt;/span>User) &lt;span style="color:#268bd2">JavaClassName&lt;/span>() &lt;span style="color:#dc322f">string&lt;/span> {
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#719e07">return&lt;/span> &lt;span style="color:#2aa198">&amp;#34;org.apache.dubbo.User&amp;#34;&lt;/span> &lt;span style="color:#586e75">// If it communicates with Java, it needs to correspond to the full name of the User class on the Java side,
&lt;/span>&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">&lt;/span>}
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#268bd2">var&lt;/span> (
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>UserProviderClient = &lt;span style="color:#719e07">&amp;amp;&lt;/span>UserProvider{} &lt;span style="color:#586e75">// client pointer
&lt;/span>&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">&lt;/span>)
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">// 2. Define the client stub class: UserProvider
&lt;/span>&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">&lt;/span>&lt;span style="color:#268bd2">type&lt;/span> UserProvider &lt;span style="color:#268bd2">struct&lt;/span> {
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">// The dubbo label is used to adapt the uppercase method name of the go side client -&amp;gt; the lowercase method name of the java side, only the dubbo protocol client needs to use it
&lt;/span>&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">&lt;/span>GetUser &lt;span style="color:#268bd2">func&lt;/span>(ctx context.Context, req &lt;span style="color:#dc322f">int32&lt;/span>) (&lt;span style="color:#719e07">*&lt;/span>User, &lt;span style="color:#dc322f">error&lt;/span>) &lt;span style="color:#586e75">//`dubbo:&amp;#34;getUser&amp;#34;`
&lt;/span>&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">&lt;/span>}
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#268bd2">func&lt;/span> &lt;span style="color:#268bd2">init&lt;/span>(){
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>hessian.&lt;span style="color:#268bd2">RegisterPOJO&lt;/span>(&lt;span style="color:#719e07">&amp;amp;&lt;/span>User{}) &lt;span style="color:#586e75">// register transfer structure to hessian library
&lt;/span>&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">// Register the client stub class to the framework, and instantiate the client interface pointer userProvider
&lt;/span>&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">&lt;/span>config. &lt;span style="color:#268bd2">SetConsumerService&lt;/span>(UserProviderClient)
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>}
&lt;/span>&lt;/span>&lt;/code>&lt;/pre>&lt;/div>&lt;h3 id="22-write-go-server-configuration-and-code">2.2 Write Go-Server configuration and code&lt;/h3>
&lt;p>server/dubbogo.yaml&lt;/p>
&lt;div class="highlight">&lt;pre tabindex="0" style="color:#93a1a1;background-color:#002b36;-moz-tab-size:4;-o-tab-size:4;tab-size:4;">&lt;code class="language-yaml" data-lang="yaml">&lt;span style="display:flex;">&lt;span>&lt;span style="color:#268bd2">dubbo&lt;/span>:
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#268bd2">registries&lt;/span>:
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#268bd2">demoZK&lt;/span>: &lt;span style="color:#586e75"># Define the service registration discovery center&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#268bd2">protocol&lt;/span>: zookeeper
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#268bd2">address&lt;/span>: &lt;span style="color:#2aa198">127.0.0.1&lt;/span>:&lt;span style="color:#2aa198">2181&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#268bd2">protocols&lt;/span>:
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#268bd2">dubbo&lt;/span>:
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#268bd2">name&lt;/span>: dubbo &lt;span style="color:#586e75"># protocol name dubbo&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#268bd2">port&lt;/span>: &lt;span style="color:#2aa198">20000&lt;/span> &lt;span style="color:#586e75"># Listening port&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#268bd2">provider&lt;/span>:
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#268bd2">services&lt;/span>:
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#268bd2">UserProvider&lt;/span>: &lt;span style="color:#586e75"># service provider structure class name&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#268bd2">interface&lt;/span>: org.apache.dubbo.UserProvider &lt;span style="color:#586e75"># The interface needs to correspond to the go/java client&lt;/span>
&lt;/span>&lt;/span>&lt;/code>&lt;/pre>&lt;/div>&lt;p>server/server.go&lt;/p>
&lt;div class="highlight">&lt;pre tabindex="0" style="color:#93a1a1;background-color:#002b36;-moz-tab-size:4;-o-tab-size:4;tab-size:4;">&lt;code class="language-go" data-lang="go">&lt;span style="display:flex;">&lt;span>&lt;span style="color:#719e07">package&lt;/span> main
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#719e07">import&lt;/span> (
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#2aa198">&amp;#34;context&amp;#34;&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#2aa198">&amp;#34;dubbo.apache.org/dubbo-go/v3/common/logger&amp;#34;&lt;/span> &lt;span style="color:#586e75">// dubbogo framework log
&lt;/span>&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">&lt;/span>&lt;span style="color:#2aa198">&amp;#34;dubbo.apache.org/dubbo-go/v3/config&amp;#34;&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>_ &lt;span style="color:#2aa198">&amp;#34;dubbo.apache.org/dubbo-go/v3/imports&amp;#34;&lt;/span> &lt;span style="color:#586e75">// dubbogo framework dependency, all dubbogo processes need to import once implicitly
&lt;/span>&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">&lt;/span>&lt;span style="color:#2aa198">&amp;#34;dubbo3-demo/api&amp;#34;&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#2aa198">&amp;#34;strconv&amp;#34;&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#2aa198">&amp;#34;time&amp;#34;&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>)
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#268bd2">type&lt;/span> UserProvider &lt;span style="color:#268bd2">struct&lt;/span> {
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>}
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">// implement the interface method
&lt;/span>&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">&lt;/span>&lt;span style="color:#268bd2">func&lt;/span> (u &lt;span style="color:#719e07">*&lt;/span>UserProvider) &lt;span style="color:#268bd2">GetUser&lt;/span>(ctx context.Context, req &lt;span style="color:#dc322f">int32&lt;/span>) (&lt;span style="color:#719e07">*&lt;/span>api.User, &lt;span style="color:#dc322f">error&lt;/span>) {
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#268bd2">var&lt;/span> err &lt;span style="color:#dc322f">error&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>logger.&lt;span style="color:#268bd2">Infof&lt;/span>(&lt;span style="color:#2aa198">&amp;#34;req:%#v&amp;#34;&lt;/span>, req)
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>user &lt;span style="color:#719e07">:=&lt;/span> &lt;span style="color:#719e07">&amp;amp;&lt;/span>api. User{}
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>user.ID = strconv.&lt;span style="color:#268bd2">Itoa&lt;/span>(&lt;span style="color:#b58900">int&lt;/span>(req))
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>user.Name = &lt;span style="color:#2aa198">&amp;#34;Laurence&amp;#34;&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>user.Age = &lt;span style="color:#2aa198">22&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>user.Time = time.&lt;span style="color:#268bd2">Now&lt;/span>()
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#719e07">return&lt;/span> user, err
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>}
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">//// MethodMapper defines method name mapping, from Go method name to Java lowercase method name, only dubbo protocol service interface needs to use
&lt;/span>&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">//// go -&amp;gt; go interoperability does not need to be used
&lt;/span>&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">//func (s *UserProvider) MethodMapper() map[string]string {
&lt;/span>&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">// return map[string]string{
&lt;/span>&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">// &amp;#34;GetUser&amp;#34;: &amp;#34;getUser&amp;#34;,
&lt;/span>&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">// }
&lt;/span>&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">//}
&lt;/span>&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#268bd2">func&lt;/span> &lt;span style="color:#268bd2">init&lt;/span>(){
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>config.&lt;span style="color:#268bd2">SetProviderService&lt;/span>(&lt;span style="color:#719e07">&amp;amp;&lt;/span>UserProvider{}) &lt;span style="color:#586e75">// Register the service provider class, the class name corresponds to the service in the configuration file
&lt;/span>&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">&lt;/span>}
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">// export DUBBO_GO_CONFIG_PATH=dubbogo.yml needs to set environment variables before running, and specify the location of the configuration file
&lt;/span>&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">&lt;/span>&lt;span style="color:#268bd2">func&lt;/span> &lt;span style="color:#268bd2">main&lt;/span>() {
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#719e07">if&lt;/span> err &lt;span style="color:#719e07">:=&lt;/span> config.&lt;span style="color:#268bd2">Load&lt;/span>(); err &lt;span style="color:#719e07">!=&lt;/span> &lt;span style="color:#cb4b16">nil&lt;/span> {
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#b58900">panic&lt;/span>(err)
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>}
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#719e07">select&lt;/span> {}
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>}
&lt;/span>&lt;/span>&lt;/code>&lt;/pre>&lt;/div>&lt;h3 id="23-write-go-client-configuration-and-code">2.3 Write Go-Client configuration and code&lt;/h3>
&lt;p>client/dubbogo.yaml&lt;/p>
&lt;div class="highlight">&lt;pre tabindex="0" style="color:#93a1a1;background-color:#002b36;-moz-tab-size:4;-o-tab-size:4;tab-size:4;">&lt;code class="language-yaml" data-lang="yaml">&lt;span style="display:flex;">&lt;span>&lt;span style="color:#268bd2">dubbo&lt;/span>:
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#268bd2">registries&lt;/span>:
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#268bd2">demoZK&lt;/span>: &lt;span style="color:#586e75"># Define the service registration discovery center&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#268bd2">protocol&lt;/span>: zookeeper
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#268bd2">address&lt;/span>: &lt;span style="color:#2aa198">127.0.0.1&lt;/span>:&lt;span style="color:#2aa198">2181&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#268bd2">consumer&lt;/span>:
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#268bd2">references&lt;/span>:
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#268bd2">UserProvider&lt;/span>: &lt;span style="color:#586e75"># stub class name&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#268bd2">protocol&lt;/span>: dubbo &lt;span style="color:#586e75"># dubbo protocol, default hessian2 serialization method&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#268bd2">interface&lt;/span>: org.apache.dubbo.UserProvider &lt;span style="color:#586e75"># The interface needs to correspond to the go/java client&lt;/span>
&lt;/span>&lt;/span>&lt;/code>&lt;/pre>&lt;/div>&lt;p>client/client.go&lt;/p>
&lt;div class="highlight">&lt;pre tabindex="0" style="color:#93a1a1;background-color:#002b36;-moz-tab-size:4;-o-tab-size:4;tab-size:4;">&lt;code class="language-go" data-lang="go">&lt;span style="display:flex;">&lt;span>&lt;span style="color:#719e07">package&lt;/span> main
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#719e07">import&lt;/span> (
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#2aa198">&amp;#34;context&amp;#34;&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#2aa198">&amp;#34;dubbo.apache.org/dubbo-go/v3/common/logger&amp;#34;&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#2aa198">&amp;#34;dubbo.apache.org/dubbo-go/v3/config&amp;#34;&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>_ &lt;span style="color:#2aa198">&amp;#34;dubbo.apache.org/dubbo-go/v3/imports&amp;#34;&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#2aa198">&amp;#34;dubbo3-demo/api&amp;#34;&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>)
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#268bd2">func&lt;/span> &lt;span style="color:#268bd2">main&lt;/span>(){
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#586e75">// start frame
&lt;/span>&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">&lt;/span>&lt;span style="color:#719e07">if&lt;/span> err &lt;span style="color:#719e07">:=&lt;/span> config.&lt;span style="color:#268bd2">Load&lt;/span>(); err &lt;span style="color:#719e07">!=&lt;/span> &lt;span style="color:#cb4b16">nil&lt;/span>{
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#b58900">panic&lt;/span>(err)
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>}
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#268bd2">var&lt;/span> i &lt;span style="color:#dc322f">int32&lt;/span> = &lt;span style="color:#2aa198">1&lt;/span>
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span> &lt;span style="color:#586e75">// initiate the call
&lt;/span>&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#586e75">&lt;/span>user, err &lt;span style="color:#719e07">:=&lt;/span> api.UserProviderClient.&lt;span style="color:#268bd2">GetUser&lt;/span>(context.&lt;span style="color:#268bd2">TODO&lt;/span>(), i)
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#719e07">if&lt;/span> err &lt;span style="color:#719e07">!=&lt;/span> &lt;span style="color:#cb4b16">nil&lt;/span> {
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>&lt;span style="color:#b58900">panic&lt;/span>(err)
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>}
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>logger.&lt;span style="color:#268bd2">Infof&lt;/span>(&lt;span style="color:#2aa198">&amp;#34;response result: %+v&amp;#34;&lt;/span>, user)
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>}
&lt;/span>&lt;/span>&lt;/code>&lt;/pre>&lt;/div>&lt;h2 id="4-start-the-service">4. Start the service&lt;/h2>
&lt;p>Open two terminals and enter the server client directory respectively&lt;/p>
&lt;p>execute separately;&lt;/p>
&lt;div class="highlight">&lt;pre tabindex="0" style="color:#93a1a1;background-color:#002b36;-moz-tab-size:4;-o-tab-size:4;tab-size:4;">&lt;code class="language-shell" data-lang="shell">&lt;span style="display:flex;">&lt;span>&lt;span style="color:#b58900">export&lt;/span> &lt;span style="color:#268bd2">DUBBO_GO_CONFIG_PATH&lt;/span>&lt;span style="color:#719e07">=&lt;/span>dubbogo.yml
&lt;/span>&lt;/span>&lt;span style="display:flex;">&lt;span>go run .
&lt;/span>&lt;/span>&lt;/code>&lt;/pre>&lt;/div>&lt;p>Start the server and the client successively, and you can see the output on the client:&lt;/p>
&lt;div class="highlight">&lt;pre tabindex="0" style="color:#93a1a1;background-color:#002b36;-moz-tab-size:4;-o-tab-size:4;tab-size:4;">&lt;code class="language-shell" data-lang="shell">&lt;span style="display:flex;">&lt;span>response result: &amp;amp;&lt;span style="color:#719e07">{&lt;/span>ID:1 Name:laurence Age:22 Time:2021-11-12 17:59:39.185 +0800 CST&lt;span style="color:#719e07">}&lt;/span>
&lt;/span>&lt;/span>&lt;/code>&lt;/pre>&lt;/div>&lt;p>successful call&lt;/p></description></item></channel></rss>