AWS Lambda使用.NET Core和Google表格API

Question

I'm writing an Alexa skill that uses an AWS Lambda function using the C# runtime (.NET Core), and am trying to connect to a Google Sheet using their API. It throws a missing DLL exception during runtime:

The type initializer for 'System.Security.Cryptography.CngKeyLite' threw an exception.

at System.Security.Cryptography.CngKeyLite.ImportKeyBlob(String blobType, Byte[] keyBlob)

at System.Security.Cryptography.RSAImplementation.RSACng.ImportKeyBlob(Byte[] rsaBlob, Boolean includePrivate)

at System.Security.Cryptography.RSAImplementation.RSACng.ImportParameters(RSAParameters parameters)

at Google.Apis.Auth.OAuth2.ServiceAccountCredential.Initializer.FromPrivateKey(String privateKey)

at Google.Apis.Auth.OAuth2.DefaultCredentialProvider.CreateServiceAccountCredentialFromParameters(JsonCredentialParameters credentialParameters)

at Google.Apis.Auth.OAuth2.DefaultCredentialProvider.CreateDefaultCredentialFromParameters(JsonCredentialParameters credentialParameters)

at AlexaProjLib.GoogleSheet.Connect()

at AlexaProj.Function.FunctionHandler(SkillRequest input, ILambdaContext context)

Inner exception:

Unable to load DLL 'ncrypt.dll': The specified module could not be found.

Code:

var credential = GoogleCredential.FromJson(_googleSecret).CreateScoped(_scopes);

Service = new SheetsService(new BaseClientService.Initializer()
{
    HttpClientInitializer = credential,
    ApplicationName = _applicationName,
});

I'm pretty new to .NET Core and Lambda - how do I get the missing DLL correctly referenced?

Answer 1

Try to follow the instructions provided in this github forum as other users encountered it also.

execute
ln -s /usr/local/opt/openssl/lib/libcrypto.1.0.0.dylib /usr/local/lib/
ln -s /usr/local/opt/openssl/lib/libssl.1.0.0.dylib /usr/local/lib/

instead of
ln -s /usr/local/Cellar/openssl/1.0.2h_1/lib/libcrypto.1.0.0.dylib /usr/local/lib
ln -s /usr/local/Cellar/openssl/1.0.2h_1/lib/libssl.1.0.0.dylib /usr/local/lib

if you receive "File exists" message ln -sf will do the magic..

ln -sf /usr/local/opt/openssl/lib/libcrypto.1.0.0.dylib /usr/local/lib/
ln -sf /usr/local/opt/openssl/lib/libssl.1.0.0.dylib /usr/local/lib/

Answer 2

The issue turned out to be that I was defining a Windows runtime in the project.json file (win10-x64), which was causing these runtime errors (AWS Lambda runs on Amazon Linux). Ended up getting it compiled and running by using dotnet lambda package , with more details here .