Grafana (backend) and Rapid SCADA

[OtavioF]

Hi,
I’m getting no output.

I’ve compiled Log(Release) > ScadaData(Release) > GrafanaDataProvider(Debug), attached to process the w3wp.exe but I’m getting no output. Am I missing something?

[OtavioF]

Hi,
I disabled “Just My Code” on Debug Options and managed to get a few more info.

Now I get this messages on every Grafana’s refresh:

Exception thrown: 'Newtonsoft.Json.JsonReaderException' in Newtonsoft.Json.dll
Exception thrown: 'Newtonsoft.Json.JsonReaderException' in Newtonsoft.Json.dll
Exception thrown: 'Scada.ScadaException' in ScadaData.dll

The soap opera continues…

[Mikhail]

Hi,

Try to get full exception stack where you can see a sequence of exceptions.
What operating conditions are causing this exception?

[OtavioF]

Hi,

The description of the exception is:

Newtonsoft.Json.JsonReaderException: 'Could not convert string to DateTime: 1608121200227. Path 'range.to', line 1, position 53.'

Using the PDB and source code of the Newtonsoft, Visual Studion points the error occurring in this function (marked with some “<<<” on the line)

internal DateTime? ReadDateTimeString(string s)
        {
            if (string.IsNullOrEmpty(s))
            {
                SetToken(JsonToken.Null, null, false);
                return null;
            }

            if (DateTimeUtils.TryParseDateTime(s, DateTimeZoneHandling, _dateFormatString, Culture, out DateTime dt))
            {
                dt = DateTimeUtils.EnsureDateTime(dt, DateTimeZoneHandling);
                SetToken(JsonToken.Date, dt, false);
                return dt;
            }

            if (DateTime.TryParse(s, Culture, DateTimeStyles.RoundtripKind, out dt))
            {
                dt = DateTimeUtils.EnsureDateTime(dt, DateTimeZoneHandling);
                SetToken(JsonToken.Date, dt, false);
                return dt;  <<<<<<<<--------
            }

            throw JsonReaderException.Create(this, "Could not convert string to DateTime: {0}.".FormatWith(CultureInfo.InvariantCulture, s));
        }

As requested, the exception stack is as it follows:

>	Newtonsoft.Json.dll!Newtonsoft.Json.JsonReader.ReadDateTimeString(string s) Line 856	C#
 	Newtonsoft.Json.dll!Newtonsoft.Json.JsonTextReader.FinishReadQuotedStringValue(Newtonsoft.Json.ReadType readType) Line 729	C#
 	Newtonsoft.Json.dll!Newtonsoft.Json.JsonTextReader.ReadAsDateTime() Line 467	C#
 	Newtonsoft.Json.dll!Newtonsoft.Json.JsonReader.ReadForType(Newtonsoft.Json.Serialization.JsonContract contract, bool hasConverter) Line 1217	C#
 	Newtonsoft.Json.dll!Newtonsoft.Json.Serialization.JsonSerializerInternalReader.PopulateObject(object newObject, Newtonsoft.Json.JsonReader reader, Newtonsoft.Json.Serialization.JsonObjectContract contract, Newtonsoft.Json.Serialization.JsonProperty member, string id) Line 2378	C#
 	Newtonsoft.Json.dll!Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateObject(Newtonsoft.Json.JsonReader reader, System.Type objectType, Newtonsoft.Json.Serialization.JsonContract contract, Newtonsoft.Json.Serialization.JsonProperty member, Newtonsoft.Json.Serialization.JsonContainerContract containerContract, Newtonsoft.Json.Serialization.JsonProperty containerMember, object existingValue) Line 485	C#
 	Newtonsoft.Json.dll!Newtonsoft.Json.Serialization.JsonSerializerInternalReader.SetPropertyValue(Newtonsoft.Json.Serialization.JsonProperty property, Newtonsoft.Json.JsonConverter propertyConverter, Newtonsoft.Json.Serialization.JsonContainerContract containerContract, Newtonsoft.Json.Serialization.JsonProperty containerProperty, Newtonsoft.Json.JsonReader reader, object target) Line 1004	C#
 	Newtonsoft.Json.dll!Newtonsoft.Json.Serialization.JsonSerializerInternalReader.PopulateObject(object newObject, Newtonsoft.Json.JsonReader reader, Newtonsoft.Json.Serialization.JsonObjectContract contract, Newtonsoft.Json.Serialization.JsonProperty member, string id) Line 2331	C#
 	Newtonsoft.Json.dll!Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateObject(Newtonsoft.Json.JsonReader reader, System.Type objectType, Newtonsoft.Json.Serialization.JsonContract contract, Newtonsoft.Json.Serialization.JsonProperty member, Newtonsoft.Json.Serialization.JsonContainerContract containerContract, Newtonsoft.Json.Serialization.JsonProperty containerMember, object existingValue) Line 485	C#
 	Newtonsoft.Json.dll!Newtonsoft.Json.Serialization.JsonSerializerInternalReader.Deserialize(Newtonsoft.Json.JsonReader reader, System.Type objectType, bool checkAdditionalContent) Line 167	C#
 	Newtonsoft.Json.dll!Newtonsoft.Json.JsonSerializer.DeserializeInternal(Newtonsoft.Json.JsonReader reader, System.Type objectType) Line 901	C#
 	System.Net.Http.Formatting.dll!System.Net.Http.Formatting.BaseJsonMediaTypeFormatter.ReadFromStream(System.Type type, System.IO.Stream readStream, System.Text.Encoding effectiveEncoding, System.Net.Http.Formatting.IFormatterLogger formatterLogger)	Unknown
 	System.Net.Http.Formatting.dll!System.Net.Http.Formatting.BaseJsonMediaTypeFormatter.ReadFromStream(System.Type type, System.IO.Stream readStream, System.Net.Http.HttpContent content, System.Net.Http.Formatting.IFormatterLogger formatterLogger)	Unknown
 	System.Net.Http.Formatting.dll!System.Net.Http.Formatting.BaseJsonMediaTypeFormatter.ReadFromStreamAsync(System.Type type, System.IO.Stream readStream, System.Net.Http.HttpContent content, System.Net.Http.Formatting.IFormatterLogger formatterLogger)	Unknown
 	System.Net.Http.Formatting.dll!System.Net.Http.Formatting.MediaTypeFormatter.ReadFromStreamAsync(System.Type type, System.IO.Stream readStream, System.Net.Http.HttpContent content, System.Net.Http.Formatting.IFormatterLogger formatterLogger, System.Threading.CancellationToken cancellationToken)	Unknown
 	System.Net.Http.Formatting.dll!System.Net.Http.HttpContentExtensions.ReadAsAsyncCore<object>(System.Net.Http.HttpContent content, System.Type type, System.Net.Http.Formatting.IFormatterLogger formatterLogger, System.Net.Http.Formatting.MediaTypeFormatter formatter, System.Threading.CancellationToken cancellationToken)	Unknown
 	System.Net.Http.Formatting.dll!System.Net.Http.HttpContentExtensions.ReadAsAsync<object>(System.Net.Http.HttpContent content, System.Type type, System.Collections.Generic.IEnumerable<System.Net.Http.Formatting.MediaTypeFormatter> formatters, System.Net.Http.Formatting.IFormatterLogger formatterLogger, System.Threading.CancellationToken cancellationToken)	Unknown
 	System.Web.Http.dll!System.Web.Http.ModelBinding.FormatterParameterBinding.ReadContentAsync(System.Net.Http.HttpRequestMessage request, System.Type type, System.Collections.Generic.IEnumerable<System.Net.Http.Formatting.MediaTypeFormatter> formatters, System.Net.Http.Formatting.IFormatterLogger formatterLogger, System.Threading.CancellationToken cancellationToken)	Unknown
 	System.Web.Http.dll!System.Web.Http.ModelBinding.FormatterParameterBinding.ReadContentAsync(System.Net.Http.HttpRequestMessage request, System.Type type, System.Collections.Generic.IEnumerable<System.Net.Http.Formatting.MediaTypeFormatter> formatters, System.Net.Http.Formatting.IFormatterLogger formatterLogger)	Unknown
 	System.Web.Http.dll!System.Web.Http.ModelBinding.FormatterParameterBinding.ExecuteBindingAsyncCore(System.Web.Http.Metadata.ModelMetadataProvider metadataProvider, System.Web.Http.Controllers.HttpActionContext actionContext, System.Web.Http.Controllers.HttpParameterDescriptor paramFromBody, System.Type type, System.Net.Http.HttpRequestMessage request, System.Net.Http.Formatting.IFormatterLogger formatterLogger, System.Threading.CancellationToken cancellationToken)	Unknown
 	System.Web.Http.dll!System.Web.Http.ModelBinding.FormatterParameterBinding.ExecuteBindingAsync(System.Web.Http.Metadata.ModelMetadataProvider metadataProvider, System.Web.Http.Controllers.HttpActionContext actionContext, System.Threading.CancellationToken cancellationToken)	Unknown
 	System.Web.Http.dll!System.Web.Http.Controllers.HttpActionBinding.ExecuteBindingAsyncCore(System.Web.Http.Controllers.HttpActionContext actionContext, System.Threading.CancellationToken cancellationToken)	Unknown
 	System.Web.Http.dll!System.Web.Http.Controllers.HttpActionBinding.ExecuteBindingAsync(System.Web.Http.Controllers.HttpActionContext actionContext, System.Threading.CancellationToken cancellationToken)	Unknown
 	System.Web.Http.dll!System.Web.Http.Controllers.ActionFilterResult.ExecuteAsync(System.Threading.CancellationToken cancellationToken)	Unknown
 	System.Web.Http.dll!System.Web.Http.ApiController.ExecuteAsync(System.Web.Http.Controllers.HttpControllerContext controllerContext, System.Threading.CancellationToken cancellationToken)	Unknown
 	System.Web.Http.dll!System.Web.Http.Dispatcher.HttpControllerDispatcher.SendAsync(System.Net.Http.HttpRequestMessage request, System.Threading.CancellationToken cancellationToken)	Unknown
 	System.Net.Http.dll!System.Net.Http.HttpMessageInvoker.SendAsync(System.Net.Http.HttpRequestMessage request, System.Threading.CancellationToken cancellationToken)	Unknown
 	System.Web.Http.dll!System.Web.Http.Dispatcher.HttpRoutingDispatcher.SendAsync(System.Net.Http.HttpRequestMessage request, System.Threading.CancellationToken cancellationToken)	Unknown
 	System.Net.Http.dll!System.Net.Http.DelegatingHandler.SendAsync(System.Net.Http.HttpRequestMessage request, System.Threading.CancellationToken cancellationToken)	Unknown
 	System.Web.Http.dll!System.Web.Http.HttpServer.SendAsync(System.Net.Http.HttpRequestMessage request, System.Threading.CancellationToken cancellationToken)	Unknown
 	System.Net.Http.dll!System.Net.Http.HttpMessageInvoker.SendAsync(System.Net.Http.HttpRequestMessage request, System.Threading.CancellationToken cancellationToken)	Unknown
 	System.Web.Http.WebHost.dll!System.Web.Http.WebHost.HttpControllerHandler.ProcessRequestAsyncCore(System.Web.HttpContextBase contextBase)	Unknown
 	System.Web.dll!System.Web.TaskAsyncHelper.BeginTask(System.Func<System.Threading.Tasks.Task> taskFunc, System.AsyncCallback callback, object state)	Unknown
 	System.Web.dll!System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()	Unknown
 	System.Web.dll!System.Web.HttpApplication.ExecuteStepImpl(System.Web.HttpApplication.IExecutionStep step)	Unknown
 	System.Web.dll!System.Web.HttpApplication.ExecuteStep(System.Web.HttpApplication.IExecutionStep step, ref bool completedSynchronously)	Unknown
 	System.Web.dll!System.Web.HttpApplication.PipelineStepManager.ResumeSteps(System.Exception error)	Unknown
 	System.Web.dll!System.Web.HttpApplication.BeginProcessRequestNotification(System.Web.HttpContext context, System.AsyncCallback cb)	Unknown
 	System.Web.dll!System.Web.HttpRuntime.ProcessRequestNotificationPrivate(System.Web.Hosting.IIS7WorkerRequest wr, System.Web.HttpContext context)	Unknown
 	System.Web.dll!System.Web.Hosting.PipelineRuntime.ProcessRequestNotificationHelper(System.IntPtr rootedObjectsPointer, System.IntPtr nativeRequestContext, System.IntPtr moduleData, int flags)	Unknown
 	System.Web.dll!System.Web.Hosting.PipelineRuntime.ProcessRequestNotification(System.IntPtr rootedObjectsPointer, System.IntPtr nativeRequestContext, System.IntPtr moduleData, int flags)	Unknown
 	[Native to Managed Transition]	
 	[Managed to Native Transition]	
 	System.Web.dll!System.Web.Hosting.PipelineRuntime.ProcessRequestNotificationHelper(System.IntPtr rootedObjectsPointer, System.IntPtr nativeRequestContext, System.IntPtr moduleData, int flags)	Unknown
 	System.Web.dll!System.Web.Hosting.PipelineRuntime.ProcessRequestNotification(System.IntPtr rootedObjectsPointer, System.IntPtr nativeRequestContext, System.IntPtr moduleData, int flags)	Unknown
 	[AppDomain Transition]	

[OtavioF]

Hi,

This seems to be something with the date format that the datasource sends to GrafanaDataProvider.

On GrafanaDataProvider, the grafanaArg.range.from value is always 01/01/0001 00:00:00. When it’s converted to Unix in TrendsController.cs (line 227), it gets a negative value, which is expected.

Tomorrow begins Christmas break on my company, so I’ll be back on this issue by January 4th.

Thank you for all your attention. I hope I’ll comeback with a solution in mind.

Happy New Year, Mikhail.

[Mikhail]

Hi,

Could not convert string to DateTime: 1608121200227. Path ‘range.to’, line 1, position 53.

You right, the problem is in format conversion. 1608121200227 is a number while a date string is expected.

Merry Christmas and Happy New Year!

[OtavioF]

Hello!

The time format was indeed wrong. However, it was easier (at least for me) to change the expected input format in GrafanaDataProvider than change it on the Grafana plugin. I’m more familiar to C# than go-lang.

In the other hand, now GrafanaDataProvider doesn’t work when receiving requests from the original Simple Json Database. I’ll make some improvements as soon as I can.

Thank you for all your support, Mikhail.

[Author]

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