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377947 : How to use the Redis cache #16

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377947-redis
Jun 30, 2023
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Jun 30, 2023
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342 changes: 342 additions & 0 deletions How to/Redis Cache/Controllers/PdfViewerController.cs
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using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Caching.Distributed;
using Microsoft.Extensions.Caching.Memory;
using Microsoft.Extensions.Configuration;
using Newtonsoft.Json;
using PDFViewerWebService;
using Syncfusion.EJ2.PdfViewer;
using System;
using System.Collections.Generic;
using System.IO;
using System.Net;

namespace RedisCache.Controllers
{
[Route("[controller]")]
[ApiController]
public class PdfViewerController : ControllerBase
{
//Initialize the cache object  
private readonly IHostingEnvironment _hostingEnvironment;
public IMemoryCache _cache;
private IDistributedCache _dCache;
private IConfiguration _configuration;
private int _slidingTime = 0;
string path;
public PdfViewerController(IMemoryCache memoryCache, IHostingEnvironment hostingEnvironment, IDistributedCache cache, IConfiguration configuration)
{
_cache = memoryCache;
_dCache = cache;
_hostingEnvironment = hostingEnvironment;
_configuration = configuration;
path = _configuration["DOCUMENT_PATH"];
//check the document path environment variable value and assign default data folder
//if it is null.
path = string.IsNullOrEmpty(path) ? Path.Combine(_hostingEnvironment.ContentRootPath, "Data") : Path.Combine(_hostingEnvironment.ContentRootPath, path);
}

[HttpPost("Load")]
[Route("[controller]/Load")]
        //Post action for Loading the PDF documents  
        public IActionResult Load([FromBody] Dictionary<string, string> jsonObject)
{
Console.WriteLine("Load called");
//Initialize the PDF viewer object with memory cache object
PdfRenderer pdfviewer = new PdfRenderer(_cache);
if (Startup.isRedisCacheEnable)
pdfviewer = new PdfRenderer(_cache, _dCache, _slidingTime);
else
pdfviewer = new PdfRenderer(_cache, _slidingTime);
MemoryStream stream = new MemoryStream();
object jsonResult = new object();
if (jsonObject != null && jsonObject.ContainsKey("document"))
{
if (bool.Parse(jsonObject["isFileName"]))
{
string documentPath = GetDocumentPath(jsonObject["document"]);
if (!string.IsNullOrEmpty(documentPath))
{
byte[] bytes = System.IO.File.ReadAllBytes(documentPath);
stream = new MemoryStream(bytes);
}
else
{
string fileName = jsonObject["document"].Split(new string[] { "://" }, StringSplitOptions.None)[0];

if (fileName == "http" || fileName == "https")
{
WebClient WebClient = new WebClient();
byte[] pdfDoc = WebClient.DownloadData(jsonObject["document"]);
stream = new MemoryStream(pdfDoc);
}

else
{
return this.Content(jsonObject["document"] + " is not found");
}
}
}
else
{
byte[] bytes = Convert.FromBase64String(jsonObject["document"]);
stream = new MemoryStream(bytes);
}
}
jsonResult = pdfviewer.Load(stream, jsonObject);
return Content(JsonConvert.SerializeObject(jsonResult));
}

[AcceptVerbs("Post")]
[HttpPost("Bookmarks")]
[Route("[controller]/Bookmarks")]
        //Post action for processing the bookmarks from the PDF documents
        public IActionResult Bookmarks([FromBody] Dictionary<string, string> jsonObject)
{
//Initialize the PDF Viewer object with memory cache object
PdfRenderer pdfviewer = new PdfRenderer(_cache);
if (Startup.isRedisCacheEnable)
pdfviewer = new PdfRenderer(_cache, _dCache, _slidingTime);
else
pdfviewer = new PdfRenderer(_cache, _slidingTime);
var jsonResult = pdfviewer.GetBookmarks(jsonObject);
return Content(JsonConvert.SerializeObject(jsonResult));
}

[AcceptVerbs("Post")]
[HttpPost("RenderPdfPages")]
[Route("[controller]/RenderPdfPages")]
        //Post action for processing the PDF documents 
        public IActionResult RenderPdfPages([FromBody] Dictionary<string, string> jsonObject)
{
//Initialize the PDF Viewer object with memory cache object
PdfRenderer pdfviewer = new PdfRenderer(_cache);
if (Startup.isRedisCacheEnable)
pdfviewer = new PdfRenderer(_cache, _dCache, _slidingTime);
else
pdfviewer = new PdfRenderer(_cache, _slidingTime);
object jsonResult = pdfviewer.GetPage(jsonObject);
return Content(JsonConvert.SerializeObject(jsonResult));
}

[AcceptVerbs("Post")]
[HttpPost("RenderPdfTexts")]
[Route("[controller]/RenderPdfTexts")]
        //Post action for processing the PDF texts 
        public IActionResult RenderPdfTexts([FromBody] Dictionary<string, string> jsonObject)
{
//Initialize the PDF Viewer object with memory cache object
PdfRenderer pdfviewer = new PdfRenderer(_cache);
if (Startup.isRedisCacheEnable)
pdfviewer = new PdfRenderer(_cache, _dCache, _slidingTime);
else
pdfviewer = new PdfRenderer(_cache, _slidingTime);
object jsonResult = pdfviewer.GetDocumentText(jsonObject);
return Content(JsonConvert.SerializeObject(jsonResult));
}

[AcceptVerbs("Post")]
[HttpPost("RenderThumbnailImages")]
[Route("[controller]/RenderThumbnailImages")]
        //Post action for rendering the ThumbnailImages
        public IActionResult RenderThumbnailImages([FromBody] Dictionary<string, string> jsonObject)
{
//Initialize the PDF Viewer object with memory cache object
PdfRenderer pdfviewer = new PdfRenderer(_cache);
if (Startup.isRedisCacheEnable)
pdfviewer = new PdfRenderer(_cache, _dCache, _slidingTime);
else
pdfviewer = new PdfRenderer(_cache, _slidingTime);
object result = pdfviewer.GetThumbnailImages(jsonObject);
return Content(JsonConvert.SerializeObject(result));
}
[AcceptVerbs("Post")]
[HttpPost("RenderAnnotationComments")]
[Route("[controller]/RenderAnnotationComments")]
        //Post action for rendering the annotations
        public IActionResult RenderAnnotationComments([FromBody] Dictionary<string, string> jsonObject)
{
//Initialize the PDF Viewer object with memory cache object
PdfRenderer pdfviewer = new PdfRenderer(_cache);
if (Startup.isRedisCacheEnable)
pdfviewer = new PdfRenderer(_cache, _dCache, _slidingTime);
else
pdfviewer = new PdfRenderer(_cache, _slidingTime);
object jsonResult = pdfviewer.GetAnnotationComments(jsonObject);
return Content(JsonConvert.SerializeObject(jsonResult));
}
[AcceptVerbs("Post")]
[HttpPost("ExportAnnotations")]
[Route("[controller]/ExportAnnotations")]
        //Post action to export annotations
        public IActionResult ExportAnnotations([FromBody] Dictionary<string, string> jsonObject)
{
PdfRenderer pdfviewer = new PdfRenderer(_cache);
if (Startup.isRedisCacheEnable)
pdfviewer = new PdfRenderer(_cache, _dCache, _slidingTime);
else
pdfviewer = new PdfRenderer(_cache, _slidingTime);
string jsonResult = pdfviewer.ExportAnnotation(jsonObject);
return Content(jsonResult);
}
[AcceptVerbs("Post")]
[HttpPost("ImportAnnotations")]
[Route("[controller]/ImportAnnotations")]
        //Post action to import annotations
        public IActionResult ImportAnnotations([FromBody] Dictionary<string, string> jsonObject)
{
PdfRenderer pdfviewer = new PdfRenderer(_cache);
if (Startup.isRedisCacheEnable)
pdfviewer = new PdfRenderer(_cache, _dCache, _slidingTime);
else
pdfviewer = new PdfRenderer(_cache, _slidingTime);
string jsonResult = string.Empty;
object JsonResult;
if (jsonObject != null && jsonObject.ContainsKey("fileName"))
{
string documentPath = GetDocumentPath(jsonObject["fileName"]);
if (!string.IsNullOrEmpty(documentPath))
{
jsonResult = System.IO.File.ReadAllText(documentPath);
}
else
{
return this.Content(jsonObject["document"] + " is not found");
}
}
else
{
string extension = Path.GetExtension(jsonObject["importedData"]);
if (extension != ".xfdf")
{
JsonResult = pdfviewer.ImportAnnotation(jsonObject);
return Content(JsonConvert.SerializeObject(JsonResult));
}
else
{
string documentPath = GetDocumentPath(jsonObject["importedData"]);
if (!string.IsNullOrEmpty(documentPath))
{
byte[] bytes = System.IO.File.ReadAllBytes(documentPath);
jsonObject["importedData"] = Convert.ToBase64String(bytes);
JsonResult = pdfviewer.ImportAnnotation(jsonObject);
return Content(JsonConvert.SerializeObject(JsonResult));
}
else
{
return this.Content(jsonObject["document"] + " is not found");
}
}
}
return Content(jsonResult);
}

[AcceptVerbs("Post")]
[HttpPost("ExportFormFields")]
[Route("[controller]/ExportFormFields")]
public IActionResult ExportFormFields([FromBody] Dictionary<string, string> jsonObject)

{
PdfRenderer pdfviewer = new PdfRenderer(_cache);
if (Startup.isRedisCacheEnable)
pdfviewer = new PdfRenderer(_cache, _dCache, _slidingTime);
else
pdfviewer = new PdfRenderer(_cache, _slidingTime);
string jsonResult = pdfviewer.ExportFormFields(jsonObject);
return Content(jsonResult);
}

[AcceptVerbs("Post")]
[HttpPost("ImportFormFields")]
[Route("[controller]/ImportFormFields")]
public IActionResult ImportFormFields([FromBody] Dictionary<string, string> jsonObject)
{
PdfRenderer pdfviewer = new PdfRenderer(_cache);
if (Startup.isRedisCacheEnable)
pdfviewer = new PdfRenderer(_cache, _dCache, _slidingTime);
else
pdfviewer = new PdfRenderer(_cache, _slidingTime);
jsonObject["data"] = GetDocumentPath(jsonObject["data"]);
object jsonResult = pdfviewer.ImportFormFields(jsonObject);
return Content(JsonConvert.SerializeObject(jsonResult));
}

[AcceptVerbs("Post")]
[HttpPost("Unload")]
[Route("[controller]/Unload")]
        //Post action for unloading and disposing the PDF document resources 
        public IActionResult Unload([FromBody] Dictionary<string, string> jsonObject)
{
//Initialize the PDF Viewer object with memory cache object
PdfRenderer pdfviewer = new PdfRenderer(_cache);
if (Startup.isRedisCacheEnable)
pdfviewer = new PdfRenderer(_cache, _dCache, _slidingTime);
else
pdfviewer = new PdfRenderer(_cache, _slidingTime);
pdfviewer.ClearCache(jsonObject);
return this.Content("Document cache is cleared");
}


[HttpPost("Download")]
[Route("[controller]/Download")]
        //Post action for downloading the PDF documents
        public IActionResult Download([FromBody] Dictionary<string, string> jsonObject)
{
//Initialize the PDF Viewer object with memory cache object
PdfRenderer pdfviewer = new PdfRenderer(_cache);
if (Startup.isRedisCacheEnable)
pdfviewer = new PdfRenderer(_cache, _dCache, _slidingTime);
else
pdfviewer = new PdfRenderer(_cache, _slidingTime);
string documentBase = pdfviewer.GetDocumentAsBase64(jsonObject);
return Content(documentBase);
}

[HttpPost("PrintImages")]
[Route("[controller]/PrintImages")]
        //Post action for printing the PDF documents
        public IActionResult PrintImages([FromBody] Dictionary<string, string> jsonObject)
{
//Initialize the PDF Viewer object with memory cache object
PdfRenderer pdfviewer = new PdfRenderer(_cache);
if (Startup.isRedisCacheEnable)
pdfviewer = new PdfRenderer(_cache, _dCache, _slidingTime);
else
pdfviewer = new PdfRenderer(_cache, _slidingTime);
object pageImage = pdfviewer.GetPrintImage(jsonObject);
return Content(JsonConvert.SerializeObject(pageImage));
}

//Gets the path of the PDF document
private string GetDocumentPath(string document)
{
string documentPath = string.Empty;
if (!System.IO.File.Exists(document))
{
var path = _hostingEnvironment.ContentRootPath;
if (System.IO.File.Exists(path + "/Data/" + document))
documentPath = path + "/Data/" + document;
}
else
{
documentPath = document;
}
Console.WriteLine(documentPath);
return documentPath;
}
// GET api/values
[HttpGet]
public IEnumerable<string> Get()
{
return new string[] { "value1", "value2" };
}

// GET api/values/5
[HttpGet("{id}")]
public string Get(int id)
{
return "value";
}
}
}
Binary file added How to/Redis Cache/Data/PDF_Succinctly.pdf
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27 changes: 27 additions & 0 deletions How to/Redis Cache/Program.cs
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using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using PDFViewerWebService;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace PdfViewerWebService
{
public class Program
{
public static void Main(string[] args)
{
CreateHostBuilder(args).Build().Run();
}

public static IHostBuilder CreateHostBuilder(string[] args) =>
Host.CreateDefaultBuilder(args)
.ConfigureWebHostDefaults(webBuilder =>
{
webBuilder.UseStartup<Startup>();
});
}
}
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