无法从链中的任何提供商 - Android 加载 AWS 凭证

Question

>我正在尝试在Android中调用lambda请求，但在调用lambda方法后出现以下错误。我没有创建任何直接将参数传递给 Lambda.invoke 方法的接口类。I 代码如下

CognitoCachingCredentialsProvider credentialsProvider = new CognitoCachingCredentialsProvider(
            getApplicationContext(),
            AppConstant.CognitoPoolID,
            Regions.EU_WEST_1);
new LambdaInvokerFactory(this.getApplicationContext(),
            Regions.EU_WEST_1, credentialsProvider);
private static void invokeFunction() {
    AWSLambdaClient lambda=new AWSLambdaClient();
    // out.println("Invoking function...");
    JSONObject x= new JSONObject();
    try{
        x.put("Command","GetMyLocations");
    }catch (JSONException e){
    }
    InvokeResult result = lambda.invoke(new InvokeRequest()
            .withFunctionName("LAMBDA_SDK_User")
            .withInvocationType(InvocationType.RequestResponse)
            .withLogType(LogType.None)
            .withPayload(ByteBuffer.wrap(x.toString().getBytes())));
    Log.d("Lambda Result",""+result.getPayload());
    //out.print();
}

错误：

01-30 16:51:44.027 20754-20754/com.example.sanmol E/AndroidRuntime: FATAL EXCEPTION: main
                                                                Process: com.example.sanmol, PID: 20754
                                                                com.amazonaws.AmazonClientException: Unable to load AWS credentials from any provider in the chain
                                                                    at com.amazonaws.auth.AWSCredentialsProviderChain.getCredentials(AWSCredentialsProviderChain.java:117)
                                                                    at com.amazonaws.services.lambda.AWSLambdaClient.invoke(AWSLambdaClient.java:406)
                                                                    at com.amazonaws.services.lambda.AWSLambdaClient.invoke(AWSLambdaClient.java:364)
                                                                    at com.example.sanmol.activities.RegistrationActivity.invokeFunction(RegistrationActivity.java:303)
                                                                    at com.example.sanmol.activities.RegistrationActivity.credentialsProvider(RegistrationActivity.java:286)
                                                                    at com.example.sanmol.activities.RegistrationActivity$AsyncTaskUserLogin.onPostExecute(RegistrationActivity.java:267)
                                                                    at com.example.sanmol.activities.RegistrationActivity$AsyncTaskUserLogin.onPostExecute(RegistrationActivity.java:232)
                                                                    at android.os.AsyncTask.finish(AsyncTask.java:632)
                                                                    at android.os.AsyncTask.access$600(AsyncTask.java:177)
                                                                    at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:645)
                                                                    at android.os.Handler.dispatchMessage(Handler.java:106)
                                                                    at android.os.Looper.loop(Looper.java:209)
                                                                    at android.app.ActivityThread.main(ActivityThread.java:5916)
                                                                    at java.lang.reflect.Method.invoke(Native Method)
                                                                    at java.lang.reflect.Method.invoke(Method.java:372)
                                                                    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1005)
                                                                    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:800)

Answer 1

您没有使用您创建的 LambdaInvokerFactory。我认为您混淆了调用 Lambda 函数的不同方式。

您可以在 Lambda 客户端中使用您的凭证吗：

AWSLambdaClient lambda=new AWSLambdaClient(credentialsProvider);

否则，请阅读 AWS 指南，了解如何使用如下所示的LambdaInvokeFactory.builder()：

public class Request {
    // Standard POJO stuff here modeling the input your Lambda function
    // expects.
}
public class Result {
    // More standard POJO stuff here modeling the output your Lambda
    // function produces.
}
public interface LambdaFunctions {
    @LambdaFunction
    Result doSomeStuff(Request request);
}
LambdaFunctions functions = LambdaInvokerFactory.builder()
                        .lambdaClient(AWSLambdaSyncClientBuilder.standard()
                             .withCredentials(credentialsProvider)
                             .build())
                        .build(LambdaFunctions.class);
Request request = new Request(...);
Result result = functions.doSomeStuff(request);

您需要在 POJO 类中对 Lambda 函数的请求和结果模型进行建模。