/// <summary>
/// Method: DeserializeJsonLogEntry
/// Goal: Converts a json string event coming from EventHub to a emp_json_log_entry object.
/// </summary>
/// <param name="jsonFromEventHubMessage">The json string event coming from the eventhub</param>
/// <param name="log">The ILogger object to log information and errors</param>
/// <returns>logEntry -> emp_json_log_entry object</returns>
/// <exception cref="JsonException"> </exception>
/// When <paramref name="jsonFromEventHubMessage"/> is invalid OR
/// When <paramref returnType="emp_json_log_entry"/> not compatible with the json OR
/// When <paramref name="jsonFromEventHubMessage"/> There is remaining data in the span beyond a single JSON value
/// <exception cref="ArgumentNullException"> </exception>
/// When <paramref name="jsonFromEventHubMessage"/> is null
/// </exception>
public static JsonLogEntry DeserializeJsonLogEntry(string jsonFromEventHubMessage, ILogger log)
{
try
{
JsonLogEntry logEntry = JsonConvert.DeserializeObject <JsonLogEntry>(jsonFromEventHubMessage);
log?.LogInformation($"DeserializeJsonLogEntry: Json was deserialized successfully: {jsonFromEventHubMessage}");
return(logEntry);
}
catch (Newtonsoft.Json.JsonException e)
{
log?.LogError($"DeserializeJsonLogEntry: JsonException: {e.Message}");
throw;
}
catch (ArgumentNullException e)
{
log?.LogError($"DeserializeJsonLogEntry: ArgumentNullException: {e.Message}");
throw;
}
}
/// <summary>
/// Method: ValidateTrigram
/// Goal: Validates if a trigram entry from the log is present in the emp-trigram storage table (single source of true) in Azure.
/// </summary>
/// <param name="storageConnectionString">The azure storage account connection string to access the azure trigram table</param>
/// <param name="logEntry">The log entry</param>
/// <param name="trigramTableName">The azure trigram table name</param>
/// <param name="log">The ILogger object to log information and errors</param>
/// <returns>validTrigram -> a boolean that reflects if the trigram is valid = true or if the trigram is not valid = false and the webhook url</returns>
/// <exception cref="ArgumentException">The exception that is thrown when one of the arguments provided to a method is not valid</exception>
public static (Boolean isValid, string webhookUrl) ValidateTrigram(string storageConnectionString, JsonLogEntry logEntry, string trigramTableName, ILogger log)
{
try
{
//Get the json string from the EventHub and converts to upper case - as Triagram table is stored as upper case
string triagramFromLogEntry = logEntry.Trigram.ToUpper();
//Retrieve Azure Cloud Table Entity that holds the information for the Application Trigrams
CloudTable cloudTable = emp_azure_storage_table_operations.RetrieveTableObject(storageConnectionString, trigramTableName, log);
//Query Azure Cloud Table with Partition and Row Key
Task <Trigram> triagramFromAzureTable = emp_azure_storage_table_operations.RetrieveEntityUsingPointQueryAsync(cloudTable, triagramFromLogEntry, triagramFromLogEntry, log);
if (triagramFromAzureTable.Result is null)
{
//Trigram not present in the Azure Storage Trigram Table
log?.LogInformation($"ValidateTrigram: Trigram entry doesn't exist on the Trigram table: {triagramFromLogEntry}");
return(false, null);
}
else
{
//Compare Trigram in the Log entry with the Azure Trigram table
//If equal return true, if not returns false
string stringTrigramFromAzureTable = triagramFromAzureTable.Result.ApplicationTrigram;
bool validTrigram = String.Equals(stringTrigramFromAzureTable, triagramFromLogEntry);
log?.LogInformation($"ValidateTrigram: Trigram entry is valid: {triagramFromLogEntry}");
return(validTrigram, triagramFromAzureTable.Result.WebHook);
}
}
catch (ArgumentException e)
{
log?.LogError($"ValidateTrigram: Exception: {e.Message}");
throw;
}
}
