57 lines
2 KiB
C#
57 lines
2 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Text.Encodings.Web;
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using System.Threading.Tasks;
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using Elsa.Scripting.Liquid.Extensions;
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using Elsa.Scripting.Liquid.Options;
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using Fluid;
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using Microsoft.Extensions.Caching.Memory;
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using Microsoft.Extensions.Options;
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namespace Elsa.Scripting.Liquid.Services
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{
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public class LiquidTemplateManager : ILiquidTemplateManager
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{
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private readonly IMemoryCache memoryCache;
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private readonly IServiceProvider serviceProvider;
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private readonly LiquidOptions options;
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public LiquidTemplateManager(IMemoryCache memoryCache, IOptions<LiquidOptions> options, IServiceProvider serviceProvider)
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{
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this.memoryCache = memoryCache;
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this.serviceProvider = serviceProvider;
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this.options = options.Value;
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}
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public async Task<string> RenderAsync(string source, TemplateContext context, TextEncoder encoder)
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{
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if (string.IsNullOrWhiteSpace(source))
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return default;
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context.AddAsyncFilters(options, serviceProvider);
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var result = GetCachedTemplate(source);
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return await result.RenderAsync(context, encoder);
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}
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private FluidTemplate GetCachedTemplate(string source)
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{
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IEnumerable<string> errors;
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var result = memoryCache.GetOrCreate(
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source,
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e =>
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{
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if (!TryParse(source, out var parsed, out errors))
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TryParse(string.Join(Environment.NewLine, errors), out parsed, out errors);
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e.SetSlidingExpiration(TimeSpan.FromSeconds(30));
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return parsed;
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});
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return result;
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}
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public bool Validate(string template, out IEnumerable<string> errors) => TryParse(template, out _, out errors);
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private bool TryParse(string template, out FluidTemplate result, out IEnumerable<string> errors) => FluidTemplate.TryParse(template, true, out result, out errors);
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}
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}
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