部署到 Azure 后 DocumentClient 不起作用

Question

I am working on a POC (in .Net Core) to write some data to local Cosmos DB emulator using Azure DocumentClient.

private string _endpointUri = String.Empty;
private string _primaryKey = String.Empty;
private DocumentClient _client;
private string _databaseName = String.Empty;
private string _collectionName = String.Empty;

public CosmosDBStorage(IConfiguration configuration)
{
    _endpointUri = configuration["CosmosDBEndpointUri"];
    _primaryKey = configuration["CosmosDBPrimaryKey"];
    _client = new DocumentClient(new Uri(_endpointUri), _primaryKey);
    _databaseName = configuration["CosmosDBName"];
    _collectionName = configuration["CosmosDBCollectionName"];
}

public async Task WriteAsync(dynamic data)
{
    try
    {
        await this._client.CreateDocumentAsync(UriFactory.CreateDocumentCollectionUri(_databaseName, _collectionName), data);
    }
    catch
    {
        throw;
    }
}

It works fine in my local, however, after deploying the app to Azure I am trying use the same local Cosmos DB emulator for testing. It fails with below error.

Exception message: An error occurred while sending the request

Exception stack trace:

at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Azure.Documents.Client.DocumentClient.HttpRequestMessageHandler.<SendAsync>d__3.MoveNext()
— End of stack trace from previous location where exception was thrown —
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1.ConfiguredTaskAwaiter.GetResult()
at System.Net.Http.HttpClient.<FinishSendAsyncBuffered>d__58.MoveNext()
— End of stack trace from previous location where exception was thrown —
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Azure.Documents.Client.GatewayServiceConfigurationReader.<GetDatabaseAccountAsync>d__43.MoveNext()
— End of stack trace from previous location where exception was thrown —
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Azure.Documents.Routing.GlobalEndpointManager.<GetDatabaseAccountFromAnyLocationsAsync>d__15.MoveNext()
— End of stack trace from previous location where exception was thrown —
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Azure.Documents.Client.GatewayServiceConfigurationReader.<InitializeReaderAsync>d__45.MoveNext()
— End of stack trace from previous location where exception was thrown —
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Azure.Documents.Client.DocumentClient.<InitializeGatewayConfigurationReader>d__319.MoveNext()
— End of stack trace from previous location where exception was thrown —
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Azure.Documents.Client.DocumentClient.<GetInitializationTask>d__85.MoveNext()
— End of stack trace from previous location where exception was thrown —
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Azure.Documents.Client.DocumentClient.<EnsureValidClientAsync>d__135.MoveNext()
— End of stack trace from previous location where exception was thrown —
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Azure.Documents.Client.DocumentClient.<GetCollectionCacheAsync>d__70.MoveNext()
— End of stack trace from previous location where exception was thrown —
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Azure.Documents.Client.DocumentClient.<CreateDocumentInlineAsync>d__143.MoveNext()
— End of stack trace from previous location where exception was thrown —
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at CallSite.Target(Closure , CallSite , Object )
at System.Dynamic.UpdateDelegates.UpdateAndExecuteVoid1T0
at BotFrameworkDev.Storage.CosmosDBStorage.<WriteAsync>d__7.MoveNext() in C:\GIS\ChatBot\BotFrameworkDev\BotFrameworkDev\Storage\CosmosDBStorage.cs:line 42
— End of stack trace from previous location where exception was thrown —
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at BotFrameworkDev.EchoBot.<OnTurn>d__8.MoveNext() in C:\GIS\ChatBot\BotFrameworkDev\BotFrameworkDev\EchoBot.cs:line 99

Any idea what could be the issue?

Update:

Added inner exception details.

Exception message: A connection with the server could not be established

Exception stack trace:

at BotFrameworkDev.Storage.CosmosDBStorage.<WriteAsync>d__7.MoveNext() in C:\GIS\ChatBot\BotFrameworkDev\BotFrameworkDev\Storage\CosmosDBStorage.cs:line 42
— End of stack trace from previous location where exception was thrown —
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at BotFrameworkDev.EchoBot.<OnTurn>d__8.MoveNext() in C:\GIS\ChatBot\BotFrameworkDev\BotFrameworkDev\EchoBot.cs:line 99

Answer 1

You cannot use the Local Emulator for testing in Azure. Azure cannot find your localhost because it's outside of the boundaries of it's network.

It will search in it's own network and fail. You will need to point to an actual CosmosDB instance or somehow expose your emulator from a server or your pc to the Azure app service.

Keep in mind that the CosmosDB Emulator is only supposed to be used for Local development and nothing else. It is supposed to emulate behaviour and not be the real thing.

The recommended approach is to create a CosmosDB account and use that connection string.