Question

我在Big Query中创建了一个项目，在API Access窗格中，我创建了服务帐户，以便我可以代表用户交互通过Windows应用程序访问Big Query API。由于我不熟悉使用和访问Google API，因此我想了解基本步骤，以便通过Windows服务访问Big Query。

Answer 1

这里有一些使用基于Web的OAuth流的.NET代码示例： Google BigQuery with .NET documentation/ samples

有关使用.NET中的服务帐户的其他开发人员的示例，请参阅： Google OAuth2 Service Account Access Token Request gives 'Invalid Request' Response

这些在.NET库之上手动实现服务帐户。 .NET库最近添加了对服务帐户的原生支持，但我还没有找到官方的例子。

以下是使用Analytics API的非官方示例。它应该与使用BigQuery的服务帐户直接类似： How do I use a Service Account to Access the Google Analytics API V3 with .NET C#?

Answer 2

最后，这是Big Query API的身份验证过程和从Big Query表中检索记录的工作代码： -

我创建了一个具有返回类型OAuth2Authenticator<AssertionFlowClient>的方法的类。

 internal class clsGetOAuth2Authentication
    {
        public OAuth2Authenticator<AssertionFlowClient> objGetOAuth2(string strPrivateFilePath, string strPrivateFilePassword, string strServiceAccEmailId,string strScope)
        {
            AuthorizationServerDescription objAuthServerDesc;
            X509Certificate2 objKey;
            AssertionFlowClient objClient;
            OAuth2Authenticator<AssertionFlowClient> objAuth = null;

            string ScopeUrl = "https://www.googleapis.com/auth/" + strScope;
            string strSrvAccEmailId = strServiceAccEmailId; 
            string strKeyFile = strPrivateFilePath; //KeyFile: This is the physical path to the key file you downloaded when you created your Service Account.
            string strKeyPassword = (strPrivateFilePassword != "") ? strPrivateFilePassword : "notasecret"; //key_pass: This is probably the password for all key files, but if you're given a different one, use that.

            objAuthServerDesc = GoogleAuthenticationServer.Description; //objAuthServerDesc: Description of the server that will grant Authentiation. 
            objKey = new X509Certificate2(strKeyFile, strKeyPassword, X509KeyStorageFlags.Exportable); //objkey: Load up and decrypt the key.
            objClient = new AssertionFlowClient(objAuthServerDesc, objKey) { ServiceAccountId = strSrvAccEmailId, Scope = ScopeUrl }; //objClient: Using the AssertionFlowClient, because we're logging in with our certificate.
            objAuth = new OAuth2Authenticator<AssertionFlowClient>(objClient, AssertionFlowClient.GetState); //objAuth: Requesting Authentication.
            return objAuth;
        }
    }

现在，另一个类调用上述方法： -

clsGetOAuth2Authentication objOAuth2 = new clsGetOAuth2Authentication();
            try
            {
                var objAuth = objOAuth2.objGetOAuth2(strKeyFile, strKeyPassword, strSrvAccEmailId, strScope); //Authentication data returned
                objBQServ = new BigqueryService(objAuth); //Instantiate BigQueryService  with credentials(objAuth) as its parameter

                #region Retrieving Records:-
                JobsResource j = objBQServ.Jobs;
                QueryRequest qr = new QueryRequest();
                qr.Query = strQuery;

                DateTime dtmBegin = DateTime.UtcNow;
                QueryResponse response = j.Query(qr, strProjId).Fetch();
                DateTime dtmEnd = DateTime.UtcNow;
                string strColHead = "";
                foreach (var colHeaders in response.Schema.Fields)
                {
                    strColHead += colHeaders.Name.ToString() + "\t";
                }
                Console.WriteLine(strColHead);
                int intCount = 0;
                foreach (TableRow row in response.Rows)
                {
                    intCount += 1;
                    List<string> list = new List<string>();
                    foreach (var field in row.F)
                    {
                        list.Add(field.V);
                    }
                    Console.WriteLine(String.Join("\t", list));
                }
                TimeSpan tsElapsed = dtmEnd - dtmBegin;
                Console.WriteLine("\n" + "Total no. of records:- " + intCount + ". Time taken:- " + tsElapsed);
                #endregion


            }
            catch (Exception ex)
            {
                Console.WriteLine("Error Occured!" + "\n\n" + "Statement:- " + ex.Message.ToString() + "\n\n" + "Description:- " + ex.ToString() + "\n\n");
                Console.WriteLine("\nPress enter to exit");
                Console.ReadLine();
            }

通过Windows服务验证BigQuery的步骤

2 个答案: