Implemented VTEX own text formatter

#9

Author: Caldas

src/SampleWebAPI/Logging/VTEXSplunkLoggerFormatter.cs

@@ -0,0 +1,100 @@
+using System;
+using System.Linq;
+using Microsoft.Extensions.Logging;
+using Splunk;
+
+namespace VTEX.SampleWebAPI.Logging
+{
+    public class VTEXSplunkLoggerFormatter : ILoggerFormatter
+    {
+        const string DateTimeFormat = "yyyy-MM-ddTHH:mm:ss.fffZ";
+
+        readonly string appVersion;
+        readonly string host;
+
+        public VTEXSplunkLoggerFormatter(string appVersion, string host)
+        {
+            this.appVersion = appVersion;
+            this.host = host;
+        }
+
+        public string Format<T>(LogLevel logLevel, EventId eventId, T state, Exception exception)
+        {
+            string log;
+            if (state is VTEXSplunkEntry)
+            {
+                var splunkEntry = state as VTEXSplunkEntry;
+                var dateTime = DateTime.UtcNow.ToString(DateTimeFormat);
+                string extraData = string.Empty;
+                if (splunkEntry.ExtraParameters != null && splunkEntry.ExtraParameters.Count > 0)
+                    extraData = string.Join(" ", splunkEntry.ExtraParameters.Select(part => { return $"{part.Item1}=\"{part.Item2}\""; }));
+                string account = splunkEntry.Account;
+                if (string.IsNullOrWhiteSpace(splunkEntry.Account))
+                    account = "-";
+                log = string.Format($"{dateTime} VTEXLog,splunkmanager,{host},{GetVTEXEventLevel(logLevel)},{GetVTEXLogType(logLevel)},\"{splunkEntry.WorkflowType}\",\"{splunkEntry.WorkflowInstance}\",{account},{appVersion} {extraData}");
+            }
+            else
+            {
+                var eventSegment = "";
+                if (!string.IsNullOrWhiteSpace(eventId.Name))
+                    eventSegment = $"Event '{eventId.Name}' on {eventId.Id}";
+                var exceptionSegment = "";
+                if (exception != null)
+                    exceptionSegment = $"Exception type: {exception.GetType().FullName}. Exception message: {exception.Message}";
+                log = string.Format($"[{logLevel}] {eventSegment} {state.ToString()}. {exceptionSegment}");
+            }
+            return log;
+        }
+
+        public SplunkJSONEntry FormatJson<T>(LogLevel logLevel, EventId eventId, T state, Exception exception)
+        {
+            return new SplunkJSONEntry(Format(logLevel, eventId, state, exception), 0, host, string.Empty, "Log");
+        }
+
+        string GetVTEXEventLevel(LogLevel logLevel)
+        {
+            VTEXEventLevel eventLevel = VTEXEventLevel.Debug;
+            switch (logLevel)
+            {
+                case LogLevel.Critical:
+                    eventLevel = VTEXEventLevel.Critical;
+                    break;
+                case LogLevel.Warning:
+                case LogLevel.Error:
+                    eventLevel = VTEXEventLevel.Important;
+                    break;
+                case LogLevel.Information:
+                    eventLevel = VTEXEventLevel.Default;
+                    break;
+                case LogLevel.Trace:
+                case LogLevel.Debug:
+                case LogLevel.None:
+                    eventLevel = VTEXEventLevel.Debug;
+                    break;
+            }
+            return eventLevel.ToString().ToLower();
+        }
+
+        string GetVTEXLogType(LogLevel logLevel)
+        {
+            VTEXLogType logType = VTEXLogType.Info;
+            switch (logLevel)
+            {
+                case LogLevel.Critical:
+                case LogLevel.Error:
+                    logType = VTEXLogType.Error;
+                    break;
+                case LogLevel.Warning:
+                    logType = VTEXLogType.Warning;
+                    break;
+                case LogLevel.Debug:
+                case LogLevel.Information:
+                case LogLevel.Trace:
+                case LogLevel.None:
+                    logType = VTEXLogType.Info;
+                    break;
+            }
+            return logType.ToString().ToLower();
+        }
+    }
+}