通过gRPC / Protobuf进行通讯

时间:2018-07-29 20:55:25

标签: android protocol-buffers protobuf-net grpc

我之所以来是因为无法进行API(Go)和客户端(Android)之间的通信。

我有这个protobuf文件:

syntax = "proto3";

option java_package = "com.emixam23.rushpoc.protobuf";
option java_outer_classname = "HelloWorld";

package helloworld;

// The greeting service definition.
service Greeter {
  // Sends a greeting
  rpc SayHello (HelloRequest) returns (HelloReply) {}
}

// The request message containing the user's name.
message HelloRequest {
  string name = 1;
}

// The response message containing the greetings
message HelloReply {
  string message = 1;
}

protobuf文件来自https://grpc.io/docs/quickstart/go.html的示例,我只是没有实现SayHelloAgain。我想要实现的是,从我的Android应用程序SayHello到Go API并获得回复...

对于android系统,我遵循了该教程(https://grpc.io/docs/quickstart/android.html),以便从protobuf文件与我的API通信。但是,有一个stub,来自我不知道在哪里。

因此,我搜索了有关如何创建存根(https://grpc.io/docs/tutorials/basic/android.html)的内容,一无所有。.ManagedChannelBuilder不存在,我找不到安装它的方法。.

PS:要从protobuf文件生成Java类,我遵循了该教程:https://proandroiddev.com/how-to-setup-your-android-app-to-use-protobuf-96132340de5c

我朝着正确的方向还是完全错误?

我的项目结构:

enter image description here

APP build.gradle

apply plugin: 'com.android.application'
apply plugin: 'com.google.protobuf'

android {
    compileSdkVersion 27
    defaultConfig {
        applicationId "com.rushpoc.emixam23.androidapp"
        minSdkVersion 21
        targetSdkVersion 27
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:27.1.1'
    implementation 'com.android.support.constraint:constraint-layout:1.1.2'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'

    //Protobuf
    implementation 'com.google.protobuf:protobuf-lite:3.0.0'

    implementation 'io.grpc:grpc-okhttp:1.13.2'
    implementation 'io.grpc:grpc-protobuf-lite:1.13.2'
    implementation 'io.grpc:grpc-stub:1.13.2'
}

protobuf {
    generatedFilesBaseDir = "$projectDir/generated"
    protoc {
        // You still need protoc like in the non-Android case
        artifact = 'com.google.protobuf:protoc:3.0.0'
    }
    plugins {
        javalite {
            // The codegen for lite comes as a separate artifact
            artifact = 'com.google.protobuf:protoc-gen-javalite:3.0.0'
        }
        grpc {
            artifact = 'io.grpc:protoc-gen-grpc-java:1.13.2'
        }
    }
    generateProtoTasks {
        all().each { task ->
            task.builtins {
                java
            }
            task.plugins {
                grpc {}
            }
        }
    }
}

最高级别/根 build.gradle

//顶层构建文件,您可以在其中添加所有子项目/模块共有的配置选项。

buildscript {
    ext.protobufVersion = '0.8.6'

    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.1.3'
        classpath "com.google.protobuf:protobuf-gradle-plugin:$protobufVersion"


        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

1 个答案:

答案 0 :(得分:1)

我还没有检查整个gradle文件,但是我在您的屏幕快照中看到.proto文件位于src/main/protobufs中,该文件没有遵循您提到的任何一个教程。默认情况下,protobuf gradle插件不会检测到此目录。因此,建议您将其更改为默认目录src/main/proto。如果您想坚持将.proto文件放在src/main/protobufs中,则可能需要通过添加

来让protobuf gradle插件知道它
// see https://github.com/google/protobuf-gradle-plugin#customizing-source-directories    
sourceSets {
  main {
    proto {
      // In addition to the default 'src/main/proto'
      srcDir 'src/main/protobufs'
    }
  }
}

之后,如果没有其他错误,protobuf gradle插件将生成Java代码。