adds debug logging

CloudWatchLogDownloader/CloudWatchLogDownloader.csproj

@@ -56,6 +56,7 @@
     <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="DebugLogger.cs" />
     <Compile Include="Models\CommandOptions.cs" />
     <Compile Include="Program.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />

CloudWatchLogDownloader/DebugLogger.cs

@@ -0,0 +1,87 @@
+using System;
+
+namespace CloudWatchLogDownloader
+{
+    internal static class DebugLogger
+    {
+        private static bool _debug;
+        public static bool Debug
+        {
+            get { return _debug; }
+            set
+            {
+                if (value && !_debug)
+                {
+                    WriteLine("debug mode active");
+                }
+                _debug = value;
+            }
+        }
+
+        public static void Write(string str)
+        {
+            if (_debug)
+            {
+                var oldcolor = Console.ForegroundColor;
+                Console.ForegroundColor = ConsoleColor.Cyan;
+                Console.Write(str);
+                Console.ForegroundColor = oldcolor;
+            }
+        }
+
+        public static void Write(object obj)
+        {
+            if (_debug)
+            {
+                var oldcolor = Console.ForegroundColor;
+                Console.ForegroundColor = ConsoleColor.Cyan;
+                Console.Write(obj);
+                Console.ForegroundColor = oldcolor;
+            }
+        }
+
+        public static void Write(string format, params object[] args)
+        {
+            if (_debug)
+            {
+                var oldcolor = Console.ForegroundColor;
+                Console.ForegroundColor = ConsoleColor.Cyan;
+                Console.Write(format, args);
+                Console.ForegroundColor = oldcolor;
+            }
+        }
+
+        public static void WriteLine(string str)
+        {
+            if (_debug)
+            {
+                var oldcolor = Console.ForegroundColor;
+                Console.ForegroundColor = ConsoleColor.Cyan;
+                Console.WriteLine(str);
+                Console.ForegroundColor = oldcolor;
+            }
+        }
+
+        public static void WriteLine(object obj)
+        {
+            if (_debug)
+            {
+                var oldcolor = Console.ForegroundColor;
+                Console.ForegroundColor = ConsoleColor.Cyan;
+                Console.WriteLine(obj);
+                Console.ForegroundColor = oldcolor;
+            }
+        }
+
+        public static void WriteLine(string format, params object[] args)
+        {
+            if (_debug)
+            {
+                var oldcolor = Console.ForegroundColor;
+                Console.ForegroundColor = ConsoleColor.Cyan;
+                Console.WriteLine(format, args);
+                Console.ForegroundColor = oldcolor;
+            }
+        }
+    }
+}

CloudWatchLogDownloader/Models/CommandOptions.cs

@@ -17,6 +17,12 @@ namespace CloudWatchLogDownloader.Models
         [ValueOption(2)]
         public string OutputFilePath { get; set; }
 
+        [Option('l', "liveStream", HelpText="Keep pulling logs until Ctrl+C is applied")]
+        public bool LiveStream { get; set; }
+
+        [Option('d',"debug", HelpText = "print additional logs to console")]
+        public bool Debug { get; set; }
+
         [ParserState]
         public IParserState ParserState { get; set; }
 

CloudWatchLogDownloader/Program.cs

@@ -16,10 +16,12 @@ namespace CloudWatchLogDownloader
             var opt = new CommandOptions();
             if (CommandLine.Parser.Default.ParseArguments(args, opt))
             {
+                DebugLogger.Debug = opt.Debug;
+
                 client = new AmazonCloudWatchLogsClient();
                 var logGroup = GetLogGroup(opt.LogGroup);
                 var logStream = GetLogStream(logGroup, opt.LogStream);
-                WriteLogToFile(logGroup, logStream, opt.OutputFilePath);
+                WriteLogToFile(logGroup, logStream, opt.LiveStream, opt.OutputFilePath);
             }
         }
 
@@ -29,8 +31,10 @@ namespace CloudWatchLogDownloader
             DescribeLogGroupsResponse lgResponse = null;
             do
             {
+                DebugLogger.WriteLine("Getting logGroups...");
                 lgResponse = client.DescribeLogGroups(new DescribeLogGroupsRequest { NextToken = (lgResponse != null ? lgResponse.NextToken : null) });
                 allGroups.AddRange(lgResponse.LogGroups);
+                DebugLogger.WriteLine("Got logGroups, have {0}, {1} more pages", allGroups.Count, (!string.IsNullOrWhiteSpace(lgResponse.NextToken) ? "still" : "no"));
             } while (!string.IsNullOrWhiteSpace(lgResponse.NextToken));
 
             if (string.IsNullOrWhiteSpace(logGroup) || logGroup[logGroup.Length - 1] == '*')
@@ -64,12 +68,14 @@ namespace CloudWatchLogDownloader
             DescribeLogStreamsResponse lsResponse = null;
             do
             {
+                DebugLogger.WriteLine("Getting logStreams...");
                 lsResponse = client.DescribeLogStreams(new DescribeLogStreamsRequest
                 {
                     NextToken = (lsResponse != null ? lsResponse.NextToken : null),
                     LogGroupName = logGroup.LogGroupName
                 });
                 allStreams.AddRange(lsResponse.LogStreams);
+                DebugLogger.WriteLine("Got logStreams, have {0}, {1} more pages", allStreams.Count, (!string.IsNullOrWhiteSpace(lsResponse.NextToken) ? "still" : "no"));
             } while (!string.IsNullOrWhiteSpace(lsResponse.NextToken));
 
             if (string.IsNullOrWhiteSpace(logStream) || logStream[logStream.Length - 1] == '*')
@@ -80,7 +86,7 @@ namespace CloudWatchLogDownloader
                     allStreams = allStreams.Where(x => x.LogStreamName.StartsWith(logStream)).ToList();
                 }
 
-                allStreams = allStreams.OrderBy(x => x.CreationTime).ToList();
+                allStreams = allStreams.OrderByDescending(x => x.CreationTime).ToList();
 
                 for (int i = 0, len = allStreams.Count; i < len; ++i)
                     Console.WriteLine(i + ") " + allStreams[i].LogStreamName);
@@ -99,20 +105,34 @@ namespace CloudWatchLogDownloader
             return ls;
         }
 
-        private static void WriteLogToFile(LogGroup logGroup, LogStream logStream, string outputFilePath = null)
+        private static void WriteLogToFile(LogGroup logGroup, LogStream logStream, bool liveStream, string outputFilePath = null)
         {
-            Console.WriteLine("Choose Output file [logs/" + logStream.LogStreamName + ".log]: ");
-            var output = Console.ReadLine();
-            if (string.IsNullOrWhiteSpace(output))
-                output = "logs/" + logStream.LogStreamName + ".log";
+            string output = null;
+            if (string.IsNullOrWhiteSpace(outputFilePath))
+            {
+                Console.WriteLine("Choose Output file [logs/" + logStream.LogStreamName + ".log]: ");
+                output = Console.ReadLine();
+                if (string.IsNullOrWhiteSpace(output))
+                    output = "logs/" + logStream.LogStreamName + ".log";
+            }
+            else
+            {
+                output = outputFilePath;
+            }
+
             if (!Directory.GetParent(output).Exists)
                 Directory.CreateDirectory(Directory.GetParent(output).FullName);
 
+            Console.WriteLine("Downloading log into " + output);
+
+            bool lsMessage = !liveStream;
+
             using (StreamWriter sw = new StreamWriter(output))
             {
                 GetLogEventsResponse leResponse = null;
                 do
                 {
+                    DebugLogger.WriteLine("Getting events...");
                     leResponse = client.GetLogEvents(new GetLogEventsRequest
                     {
                         LogGroupName = logGroup.LogGroupName,
@@ -120,12 +140,23 @@ namespace CloudWatchLogDownloader
                         StartFromHead = true,
                         NextToken = (leResponse != null ? leResponse.NextForwardToken : null)
                     });
+                    DebugLogger.WriteLine("Got {0} events", leResponse.Events.Count);
 
                     foreach (var ev in leResponse.Events)
                         sw.WriteLine(ev.Message);
 
                     sw.Flush();
-                } while (leResponse.NextForwardToken != null && leResponse.Events.Any());
+
+                    if (!leResponse.Events.Any() && !lsMessage && liveStream)
+                    {
+                        lsMessage = true;
+                        ConsoleColor oldcolor = Console.ForegroundColor;
+                        Console.ForegroundColor = ConsoleColor.Yellow;
+                        Console.WriteLine("Now streaming live from lg: " + logGroup.LogGroupName + " ls: " + logStream.LogStreamName + " into " + output);
+                        Console.ForegroundColor = oldcolor;
+                        Console.WriteLine("{0}{0}Press CTRL+C to stop...", Environment.NewLine);
+                    }
+                } while ((leResponse.NextForwardToken != null && leResponse.Events.Any()) || liveStream);
             }
         }
 

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2016 gardient
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

@@ -0,0 +1,24 @@
+# CloudWatchLogDownloader
+Download full logs from AWS CloudWatch
+
+## Who is it for?
+For idiots like me who just want a text dump of the cloud watch log without going through S3
+
+## Why .NET?
+Because I was working with the .NET AWSSDK when writing this.
+
+## Why not .NET CORE?
+Because the AWSSDK.CloudWatchLogs nuget package doesn't support it. (As of writing this README)
+
+## Usage
+If you're still reading this means you want to use this abomination... Good.
+
+### Command line params
+|short|long|Description|
+|-----|----|-----------|
+|-g|--logGroup|The log group you want to select the stream from, can end with '*' in which case the option to choose from all groups starting with this will be given|
+|-s|--logStream|The log stream you want to save, can end with '*' in which case the option to choose from all groups starting with this will be given|
+|-o|--outputFile|The file to output the logs to.|
+|-l|--liveStream|After reaching the newest log keep polling until ctrl+c is pressed|
+
+If any of the above are not specified the program will prompt for them