无法从链中的任何提供程序加载AWS凭证 - Android

Question

我想在Android中调用lambda请求，但调用lambda方法后出现跟随错误。我尚未创建任何直接将参数传递给Lambda.invoke方法的接口类。我的代码按如下

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

你不使用你创建LambdaInvokerFactory。我认为你正在混合调用Lambda函数的不同方式。

您可以使用您的凭据在lambda客户端：

AWSLambdaClient lambda=new AWSLambdaClient(credentialsProvider); 

否则读AWS上如何与LambdaInvokeFactory.builder()这样做导游：

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); 

您需要将请求模型和POJO类中的Lambda函数的Result模型。