i was trying to create an EPaper PDF viewer using react js as front-end and back-end asp.net core web api, here my API code that return pdf file.
[HttpGet]
public async Task<IActionResult> Get(int id)
{
var epaper = await _context.EPaperFilePages.FirstOrDefaultAsync(x =>
x.Id == id);
if (epaper == null)
{
return NotFound();
}
var inputPath = $"{_hostingEnvironment.WebRootPath}\\EPaper\\{epaper.PageFileName}";
MemoryStream stream = new MemoryStream();
using (FileStream fileStream = new FileStream(inputPath, FileMode.Open))
{
await fileStream.CopyToAsync(stream);
await fileStream.FlushAsync();
}
stream.Position = 0;
return File(stream, System.Net.Mime.MediaTypeNames.Application.Pdf);
}
when i use this api in browser or react code it was loading very slow minimum it was taking 1 min to load the file.
please suggest is there any way to load pdf file faster using any packages or how should i improve my code that loads the pdf file faster.
You can query like detail = Parking.joins(:cars).select('parkings.*, count(cars.parking_id) as Alloted, no_of_places - count(parking_id) as Remaining, cars.*, cars.id as car_id').group('place_name')
joins will do an inner join and leave off parking records where there are no cars.
Instead, can you do an includes? Or a .left_outer_joins
detail = Parking.left_outer_joins(:cars).
select('parking_id, place_name, no_of_places, count(parking_id) as Alloted, no_of_places - count(parking_id) as Remaining').
group('place_name')
Related
I want to create endpoint that will stream video stream that is stored in azure CloudBlob. Here is snippet of my code:
public async Task<IActionResult> GetVideo(string videoId)
{
var videoStream = await _contentStorage.Get(videoId);
var fileStreamResult = new FileStreamResult(videoStream, mimeType);
fileStreamResult.EnableRangeProcessing = true;
return fileStreamResult;
}
and in ContentStorage
public async Task<StoredContent> Get(string id)
{
var block = _blobContainer.GetBlobClient(id);
var ms = await block.OpenReadAsync();
return ms;
}
I had everything working fine except iPhones and safari, after some debugging it turned out that my endpoint is returning 200 http code, but it should 206 - partial content. So I made some changes into my code, here is some snippet:
public async Task<IActionResult> GetVideo(string videoId)
{
var videoStream = await _contentStorage.Get(videoId);
var ms = new MemoryStream();
await videoStream.CopyToAsync(ms);
var fileStreamResult = new FileStreamResult(ms, mimeType);
fileStreamResult.EnableRangeProcessing = true;
return fileStreamResult;
}
Now when I test it on iphone or by postman response is 206, and it's working fine. But I thing that copping the video stream into new memorystream is a valid approach.
Correct me if I'm wrong but I understand this code as for every partial of the video, I'm downloading whole video from blob storage, cut it and then return just the piece within range.
It's not sure for me how to handle this case, is there any out of the box solution for that, or do I need to read range header from request and use OpenReadAsync with parameters as position and buffer side? Or there is another way?
Solution for me was to update Azure.Storage.Blobs library. I had 12.6.0 and after update to 12.7.0 it started working as expected, since they added:
Added seekability to BaseBlobClient.OpenRead().
I have implemented REST API calls using a standalone c# console application. The API returns JSON which i'm deserializing and then storing it in the database.
Now i want to implement the entire logic in Azure platform so that it can invoked by passing start date and an end date and store location (it should run for three location) Below is the code:
static void Main()
{
MakeInventoryRequest();
}
static async void MakeInventoryRequest()
{
using (var client = new HttpClient())
{
var queryString = HttpUtility.ParseQueryString(string.Empty);
// Request headers
client.DefaultRequestHeaders.Add("Ocp-Apim-Subscription-Key", "5051fx6yyy124hhfyuscf34f57ce9");
// Request parameters
queryString["query.locationNumbers"] = "4638";
queryString["availableFromDate"] = "2019-01-01";
queryString["availableToDate"] = "2019-03-07";
var uri = "https://api-test.location.cloud/api/v1/inventory?" + queryString;
using (var request = new HttpRequestMessage(HttpMethod.Get, uri))
using (var response = await client.SendAsync(request))
{
var stream = await response.Content.ReadAsStreamAsync();
if (response.IsSuccessStatusCode == true)
{
List<Inventory> l1 = DeserializeJsonFromStream<List<Inventory>>(stream);
InsertInventoryRecords(l1);
}
if (response.IsSuccessStatusCode == false)
{
throw new Exception("Error Response Code: " + response.StatusCode.ToString() + "Content is: " + response.Content.ReadAsStringAsync().Result.ToString());
}
}
}
}
Please suggest the best possible design using Azure components
With the information in hand I think you have multiple options , you need to find out which works for you the best . You can use Cloud service to host the console app ( you will have to change it to worker role , Visual studio will help you to convert that ) . I am not sure about the load which you are expecting but you can always increase and decrease the instance and these can be deployed to different geographies .
I see that you are persisting the data , if you want to do that you can use many of the SQL offerings . For invoking the REST API you can also azure functions and ADF.
Please feel free to comment if you want any more details on the same.
does someone know ho to set a max file size for images/files uploaded on a Dialog on the Microsoft Bot Framework?
Thanks in advance! :)
not for NodeJs, but for the C# case i have done this
using (var http = new HttpClient())
{
var file = (response as AwaitableAttachment).Attachment;
var file_content = await http.GetAsync(file.ContentUrl);
var contentLenghtBytes = file_content.Content.Headers.ContentLength;
var contentLengthMegabytes = (contentLenghtBytes / 1024f) / 1024f;
return result;
}
for NodeJs maybe you should use https.get method
I can't use the ServiceStack Client libraries and I've chosen to use the HttpClient PCL library instead. I can do all my Rest calls (and other json calls) without a problem, but I'm now stucked with uploading files.
A snippet of what I am trying to do:
var message = new HttpRequestMessage(restRequest.Method, restRequest.GetResourceUri(BaseUrl));
var content = new MultipartFormDataContent();
foreach (var file in files)
{
byte[] data;
bool success = CxFileStorage.TryReadBinaryFile(file, out data);
if (success)
{
var byteContent = new ByteArrayContent(data);
byteContent.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")
{
FileName = System.IO.Path.GetFileName(file) ,
};
content.Add(byteContent);
}
}
message.Content = content;
Problem is now that I get a null reference exception (status 500) when posting. I doesn't get into the service. I see the call in the filterrequest, but that's it.
So I'm wondering what I do wrong and how I can pinpoint what is going wrong. How can I catch the correct error on the ServiceStack layer?
The web socket is written in javascript by my colleague. I managed to connect. First of all I have to log in on the application using a test account. I have to send the email and password through a json. I have installed the Json.Net packet using NuGet.
Some code that I found on my reaserch is this, but I do not understand how to send my data using that segment.
var buffer = new byte[1024];
var segment = new ArraySegment<byte>(buffer);
webSocket.SendAsync(segment, WebSocketMessageType.Text, true, CancellationToken.None);
Of course, I can use an object
User user=new User();
user.Email="bla#bla.com";
user.Password="pass";
string json = JsonConvert.SerializeObject(user);
But it will not be of any use because the method SendAsync accepts only byte type on segment.
All I want is to send that data, and if log in succeeds, I should receive other data (in Json format) about the user.
As a side note, I am quite new to web sockets, I used http protocols from ASP.NET WEB API 2.
I have no idea about Windows Phone 8, but by the code you pasted it seems similar to the regular .NET ClientWebSocket, so here you have some examples:
public static Task SendString(ClientWebSocket ws, String data, CancellationToken cancellation)
{
var encoded = Encoding.UTF8.GetBytes(data);
var buffer = new ArraySegment<Byte>(encoded, 0, encoded.Length);
return ws.SendAsync(buffer, WebSocketMessageType.Text, true, cancellation);
}
public static async Task<String> ReadString(ClientWebSocket ws)
{
ArraySegment<Byte> buffer = new ArraySegment<byte>(new Byte[8192]);
WebSocketReceiveResult result = null;
using (var ms = new MemoryStream())
{
do
{
result = await ws.ReceiveAsync(buffer, CancellationToken.None);
ms.Write(buffer.Array, buffer.Offset, result.Count);
}
while (!result.EndOfMessage);
ms.Seek(0, SeekOrigin.Begin);
using (var reader = new StreamReader(ms, Encoding.UTF8))
return reader.ReadToEnd();
}
}
If something does not compile or exists in WP8, just find an equivalent.
#vtortola is a working example in case your data comes in multiple segmented messages, but if all data comes in a single message you don't need all those streams to read the message, you just need to do this:
public static async Task<String> ReadString(ClientWebSocket socket)
{
var reciveBuffer = new byte[32000];
var result = await socket.ReceiveAsync(new ArraySegment<byte>(reciveBuffer), CancellationToken.None);
if (result.MessageType == WebSocketMessageType.Close)
{
await socket.CloseAsync(WebSocketCloseStatus.NormalClosure, string.Empty, CancellationToken.None);
}
return Encoding.ASCII.GetString(reciveBuffer , 0, result.Count);
}
If your message is splited in multiple segments or you don't know how your message is comming then you have to do like #vtortola
Also if you want to keep receiving messages you can do a while and call ReadString inside, like this:
while (socket.State == WebSocketState.Open)
{
var msg = ReadString(socket)
//do something with your message...
}