lux/EgwCoreLib.Lux.Data/Services/ImageCacheService.cs

using Microsoft.Extensions.Configuration;
using Newtonsoft.Json;
using NLog;
using RestSharp;
using StackExchange.Redis;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace EgwCoreLib.Lux.Data.Services
{
    public class ImageCacheService
    {
        #region Public Constructors

        public ImageCacheService(IConfiguration config, IConfiguration configuration, IRedisService redisService)
        {
            _config = config;
            _redisService = redisService;
            svgChannel = _config.GetValue<string>("ServerConf:SvgChannel") ?? "svg:img";
            liveTag = _config.GetValue<string>("ServerConf:ImageLiveTag") ?? "svg";
            cacheTag = _config.GetValue<string>("ServerConf:ImageFileTag") ?? "svgfile";
            calcTag = _config.GetValue<string>("ServerConf:ImageCalcTag") ?? "svg-preview";
            // verifico la url base
            apiUrl = _config.GetValue<string>("ServerConf:Prog.ApiUrl") ?? "https://iis01.egalware.com/lux/srv/api/window";
            // fix opzioni base del RestClient
            restOptStd = new RestClientOptions
            {
                Timeout = TimeSpan.FromSeconds(60),
                BaseUrl = new Uri(apiUrl)
            };
            Log.Info("ImageCache Service Started");
        }

        #endregion Public Constructors

        #region Public Methods

        /// <summary>
        /// Effettua una generica chiamata ApiRest
        /// </summary>
        /// <param name="ApiUrl">URL Api di base</param>
        /// <param name="ApiRequest">Richiesta completa</param>
        /// <returns></returns>
        public async Task<RestResponse> CallRestGet(string ApiUrl, string ApiRequest)
        {
            RestResponse response;
            // cerco online
            using (RestClient client = new RestClient(ApiUrl))
            {
                var request = new RestRequest(ApiRequest, Method.Get);
                response = await client.GetAsync(request);
            }
            return response;
        }

        /// <summary>
        /// Effettua una generica chiamata ApiRest
        /// </summary>
        /// <param name="ApiUrl">URL Api di base</param>
        /// <param name="ApiRequest">Richiesta completa</param>
        /// <param name="JsonBody">Corpo Json trasmesso con richiesta</param>
        /// <returns></returns>
        public async Task<RestResponse> CallRestPost(string ApiUrl, string ApiRequest, string JsonBody)
        {
            RestResponse response;
            // cerco online
            using (RestClient client = new RestClient(ApiUrl))
            {
                var request = new RestRequest(ApiRequest, Method.Post);
                string rawData = JsonConvert.SerializeObject(JsonBody);
                request.AddJsonBody(rawData);
                response = await client.ExecutePostAsync(request);
            }
            return response;
        }

        /// <summary>
        /// Calcola URL immagine dato
        /// </summary>
        /// <param name="baseUrl">Base url IMG server (da config)</param>
        /// <param name="isLive">Live = in fase di calcolo (cache REDIS), altrimenti da filesystem</param>
        /// <param name="imgUID">UID elemento/immagine</param>
        /// <returns></returns>
        public string ImageUrl(string baseUrl, bool isLive, string imgUID)
        {
            string tag = isLive ? liveTag : cacheTag;
            if (!imgUID.EndsWith(".svg"))
            {
                imgUID += ".svg";
            }
            string fullUrl = $"{baseUrl}/{tag}/{imgUID}".Replace("////", "//");
            return fullUrl;
        }

        /// <summary>
        /// Recupera img redis SVG x uid richiesta
        /// </summary>
        /// <param name="imgUid"></param>
        public string LoadSvg(string imgUid)
        {
            // recupero img da cache
            string currKey = $"{redisBaseKey}:Images:{imgUid.Replace("/", ":")}";
            var rawVal = _redisService.Get(currKey);
            return $"{rawVal}";
        }

        /// <summary>
        /// Recupera img redis SVG x id porta richiesta
        /// </summary>
        /// <param name="imgId"></param>\
        public async Task<string> LoadSvgAsync(string imgId)
        {
            // recupero img da cache
            string currKey = $"{redisBaseKey}:Images:{imgId.Replace("/", ":")}";
            var rawVal = await _redisService.GetAsync(currKey);
            return $"{rawVal}";
        }

        /// <summary>
        /// Calcola URL immagine dato
        /// </summary>
        /// <param name="baseUrl">Base url IMG server (da config)</param>
        /// <param name="imgUID">UID elemento/immagine</param>
        /// <param name="serJwd">JWD serializzato di cui si richiede l'immagine aggiornata</param>
        /// <returns></returns>
        public string ReqUpdateSvg(string baseUrl, string imgUID, string serJwd)
        {
            string answ = "";
            if (imgUID.EndsWith(".svg"))
            {
                imgUID.Replace(".svg", "");
            }
            string fullUrl = $"{baseUrl}/svg-preview/{imgUID}".Replace("////", "//");

            return answ;
        }

        /// <summary>
        /// Salva e invia su channel img redis SVG per il doc richiesto
        /// </summary>
        /// <param name="imgId"></param>
        /// <param name="bomContent"></param>
        public async Task<bool> SaveBomAsync(string imgId, string bomContent)
        {
            // salvo img in cache
            string currKey = $"{redisBaseKey}:BOM:{imgId.Replace("/", ":")}";
            var done = await _redisService.SetAsync(currKey, bomContent);
            // invio notifica nuova svg generata sul canale... viene inviato solo svg con ID nel canale
            string notifyChannel = $"{bomChannel}:{imgId}";
            long numSent = await _redisService.PublishAsync(notifyChannel, bomContent);
            return done;
        }

        /// <summary>
        /// Salva e invia su channel img redis SVG per il doc richiesto
        /// </summary>
        /// <param name="imgId"></param>
        /// <param name="svgContent"></param>
        /// <returns></returns>
        public bool SaveSvg(string imgId, string svgContent)
        {
            // salvo img in cache
            string currKey = $"{redisBaseKey}:Images:{imgId.Replace("/", ":")}";
            var done = _redisService.Set(currKey, svgContent);
            // invio notifica nuova imgsvg sul canale... viene "reimbustata"
            string notifyChannel = $"svg-gen:{imgId}";
            long numSent = _redisService.Publish(notifyChannel, svgContent);
            return done;
        }

        /// <summary>
        /// Salva e invia su channel img redis SVG per il doc richiesto
        /// </summary>
        /// <param name="imgId"></param>
        /// <param name="svgContent"></param>
        public async Task<bool> SaveSvgAsync(string imgId, string svgContent)
        {
            // salvo img in cache
            string currKey = $"{redisBaseKey}:Images:{imgId.Replace("/", ":")}";
            var done = await _redisService.SetAsync(currKey, svgContent);
            // invio notifica nuova svg generata sul canale... viene inviato solo svg con ID nel canale
            string notifyChannel = $"{svgChannel}:{imgId}";
            long numSent = await _redisService.PublishAsync(notifyChannel, svgContent);
            return done;
        }

        #endregion Public Methods

        #region Private Fields

        private static Logger Log = LogManager.GetCurrentClassLogger();

        private readonly IRedisService _redisService;

        private readonly string apiUrl = "";

        private readonly string bomChannel = "bom:item";

        private readonly string cacheTag = "svgfile";

        private readonly string calcTag = "svgpreview";

        private readonly string liveTag = "svg";

        private readonly string svgChannel = "svg:img";

        private IConfiguration _config;

        private string imageBaseUrl = "";

        private string redisBaseKey = "Lux";

        #endregion Private Fields

        #region Private Properties

        /// <summary>
        /// Conf client RestSharp standard:
        /// - base URI al sito
        /// - timeout 1 min
        /// </summary>
        private RestClientOptions restOptStd { get; set; } = new RestClientOptions();

        #endregion Private Properties
    }
}