AlertNotifier.cs

using System;
using System.Collections.Generic;
using System.Text;
using System.Threading.Tasks;
using Waher.Content.Emoji;
using Waher.Content.Markdown;
using Waher.Events;
 
namespace Waher.IoTGateway.Events
{
    public class AlertNotifier : EventSink
    {
        public AlertNotifier(string ObjectID)
            : base(ObjectID)
        {
        }
 
        public override Task Queue(Event Event)
        {
            StringBuilder Markdown = new StringBuilder();
 
            if (!Event.Message.Contains("=======" + Environment.NewLine))
            {
                Markdown.AppendLine(Event.Type.ToString());
                Markdown.AppendLine("===============");
                Markdown.AppendLine();
            }
 
            Markdown.AppendLine(Event.Message);
 
            Markdown.AppendLine();
            Markdown.AppendLine("| Information ||");
            Markdown.AppendLine("|:------|:-----|");
 
            StringBuilder sb = new StringBuilder();
 
            sb.Append(Event.Timestamp.ToShortDateString());
            sb.Append(", ");
            sb.Append(Event.Timestamp.ToLongTimeString());
 
            if (Event.Timestamp.Kind == DateTimeKind.Utc)
                sb.Append(" (UTC)");
 
            this.AppendLabel("Timestamp", sb.ToString(), Markdown);
            this.AppendLabel("Event ID", Event.EventId, Markdown);
            this.AppendLabel("Actor", Event.Actor, Markdown);
            this.AppendLabel("Object", Event.Object, Markdown);
            this.AppendLabel("Module", Event.Module, Markdown);
            this.AppendLabel("Facility", Event.Facility, Markdown);
 
            if (!(Event.Tags is null) && Event.Tags.Length > 0)
            {
                foreach (KeyValuePair<string, object> P in Event.Tags)
                    this.AppendLabel(P.Key, P.Value?.ToString(), Markdown);
            }
 
            return Gateway.SendNotification(Markdown.ToString());
        }
 
        private void AppendLabel(string Label, string Value, StringBuilder Markdown)
        {
            bool First = true;
 
            Markdown.Append("| ");
            Markdown.Append(MarkdownDocument.Encode(Label));
            Markdown.Append(" | ");
 
            if (Value.Length > 2 && Value.StartsWith(":") && Value.EndsWith(":") &&
                EmojiUtilities.TryGetEmoji(Value[1..^1], out EmojiInfo _))
            {
                Markdown.Append(Value);
            }
            else
            {
                foreach (string Row in Value.Trim().Replace("\r\n", "\n").Replace("\r", "\n").Split('\n'))
                {
                    if (First)
                        First = false;
                    else
                        Markdown.Append("<br/>");
 
                    Markdown.Append(MarkdownDocument.Encode(Row));
                }
            }
 
            Markdown.AppendLine(" |");
        }
    }
}