public async Task LogMessageAsync(MessageSeverity severity, string message)
{
if (this.IsEnabled(severity))
{
await _writer.WriteLineAsync($"{DateTime.Now.ToString("yyyy-MM-ddTHH:mm:ss")} {severity.ToString().ToUpper()} {message}");
// I'm intentioanlly not awaiting this
_writer.FlushAsync();
}
}
} // End Sub WriteArray
public static async System.Threading.Tasks.Task <System.Exception> AsJSON(
this IDbConnection cnn
, System.IO.TextWriter output
, string sql
, RenderType_t format
, object param = null
, IDbTransaction transaction = null
, int?commandTimeout = null
, CommandType?commandType = null)
{
try
{
using (System.Data.Common.DbDataReader dr = cnn.ExecuteDbReader(sql, param, transaction, commandTimeout, commandType))
{
using (Newtonsoft.Json.JsonTextWriter jsonWriter =
new Newtonsoft.Json.JsonTextWriter(output)) // context.Response.Output)
{
if (format.HasFlag(RenderType_t.Indented))
{
jsonWriter.Formatting = Newtonsoft.Json.Formatting.Indented;
}
// https://stackoverflow.com/questions/15305203/what-to-do-with-errors-when-streaming-the-body-of-an-http-request
// https://tools.ietf.org/html/rfc2616#section-14.40
// https://stackoverflow.com/questions/50299300/how-to-write-malformed-http-response-to-guarantee-something-akin-to-http-500
// https://stackoverflow.com/questions/50298999/write-http-trailer-headers-manually
// How do I write a useful trail header to the response that can be displayed well by the browser?
// You don’t. Mainstream Web browsers do not care about trailers.
// context.Response.StatusCode = (int)System.Net.HttpStatusCode.OK;
// context.Response.ContentType = "application/json";
await jsonWriter.WriteStartObjectAsync();
await jsonWriter.WritePropertyNameAsync("tables");
await jsonWriter.WriteStartArrayAsync();
do
{
if (!format.HasFlag(RenderType_t.Data_Only) &&
!format.HasFlag(RenderType_t.DataTable))
{
await jsonWriter.WriteStartObjectAsync();
await jsonWriter.WritePropertyNameAsync("columns");
if (format.HasFlag(RenderType_t.Columns_Associative))
{
await WriteAssociativeColumnsArray(jsonWriter, dr, format);
}
else if (format.HasFlag(RenderType_t.Columns_ObjectArray))
{
await WriteComplexArray(jsonWriter, dr, format);
}
else // (format.HasFlag(RenderType_t.Array))
{
await WriteArray(jsonWriter, dr);
}
} // End if (!format.HasFlag(RenderType_t.Data_Only))
if (!format.HasFlag(RenderType_t.Data_Only) &&
!format.HasFlag(RenderType_t.DataTable))
{
await jsonWriter.WritePropertyNameAsync("rows");
} // End if (!format.HasFlag(RenderType_t.Data_Only))
await jsonWriter.WriteStartArrayAsync();
string[] columns = null;
if (format.HasFlag(RenderType_t.DataTable))
{
columns = new string[dr.FieldCount];
for (int i = 0; i < dr.FieldCount; i++)
{
columns[i] = dr.GetName(i);
} // Next i
} // End if (format.HasFlag(RenderType_t.DataTable))
while (await dr.ReadAsync())
{
if (format.HasFlag(RenderType_t.DataTable))
{
await jsonWriter.WriteStartObjectAsync();
}
else
{
await jsonWriter.WriteStartArrayAsync();
}
for (int i = 0; i <= dr.FieldCount - 1; i++)
{
object obj = await dr.GetFieldValueAsync <object>(i);
if (obj == System.DBNull.Value)
{
obj = null;
}
if (columns != null && format.HasFlag(RenderType_t.DataTable))
{
await jsonWriter.WritePropertyNameAsync(columns[i]);
}
await jsonWriter.WriteValueAsync(obj);
} // Next i
if (format.HasFlag(RenderType_t.DataTable))
{
await jsonWriter.WriteEndObjectAsync();
}
else
{
await jsonWriter.WriteEndArrayAsync();
}
} // Whend
await jsonWriter.WriteEndArrayAsync();
if (!format.HasFlag(RenderType_t.Data_Only) &&
!format.HasFlag(RenderType_t.DataTable))
{
await jsonWriter.WriteEndObjectAsync();
} // End if (!format.HasFlag(RenderType_t.Data_Only))
} while (await dr.NextResultAsync());
await jsonWriter.WriteEndArrayAsync();
await jsonWriter.WriteEndObjectAsync();
await jsonWriter.FlushAsync();
await output.FlushAsync();
} // jsonWriter
} // End Using dr
} // End Try
catch (System.Exception ex)
{
return(ex);
} // End Catch
return(null);
} // End Task AsJSON