Created
October 11, 2019 18:49
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using System; | |
using System.Collections.Concurrent; | |
using System.Collections.Generic; | |
using System.Diagnostics; | |
using System.IO; | |
using System.Linq; | |
using System.Threading; | |
using System.Threading.Tasks; | |
using MimeKit; | |
using MimeKit.Text; | |
using MimeKit.Utils; | |
using Newtonsoft.Json; | |
namespace ConsoleApp25 | |
{ | |
class Program | |
{ | |
static char[] spearators = new char[] { ' ', '\t', ',', '!', '\r', '(', ')', '?', '-', '"', '\n', '/' }; | |
static char[] trim = new char[] { '.', }; | |
public class DocRef | |
{ | |
public string Id; | |
public string Path; | |
public long Number; | |
} | |
public enum Fields | |
{ | |
Body, | |
Subject, | |
Date, | |
From, | |
To | |
} | |
static HashSet<string> stopWords = new HashSet<string> | |
{ | |
"a", "an", "and", "are", "as", "at", "be", "but", "by", | |
"for", "if", "in", "into", "is", "it", | |
"no", "not", "of", "on", "or", "such", | |
"that", "the", "their", "then", "there", "these", | |
"they", "this", "to", "was", "will", "with", "you", "have", "has" , | |
"please" | |
}; | |
static ConcurrentDictionary<long, DocRef> docs = new ConcurrentDictionary<long, DocRef>(); | |
static ConcurrentDictionary<string, ConcurrentQueue<long>>[] fields = new ConcurrentDictionary<string, ConcurrentQueue<long>>[] | |
{ | |
new ConcurrentDictionary<string, ConcurrentQueue<long>>(), // Body | |
new ConcurrentDictionary<string, ConcurrentQueue<long>>(), // Subject | |
new ConcurrentDictionary<string, ConcurrentQueue<long>>(), // Date | |
new ConcurrentDictionary<string, ConcurrentQueue<long>>(), // From | |
new ConcurrentDictionary<string, ConcurrentQueue<long>>(), // To | |
}; | |
static void Main(string[] args) | |
{ | |
var dir = @"C:\Users\ayende\Downloads\maildir\"; | |
long index = 0; | |
var blockingCollection = new BlockingCollection<string>(2048); | |
var tasks = new List<Task>(); | |
for (int i = 0; i < 16; i++) | |
{ | |
var task = Task.Run(() => | |
{ | |
while (blockingCollection.IsCompleted == false) | |
{ | |
using var stream = File.OpenRead(blockingCollection.Take()); | |
var parser = new MimeParser(stream, MimeFormat.Entity); | |
while (parser.IsEndOfStream == false) | |
{ | |
var entity = parser.ParseMessage(); | |
var cur = Interlocked.Increment(ref index); | |
foreach (var item in entity.To) | |
{ | |
fields[(int)Fields.To] | |
.GetOrAdd(item.ToString().ToLower(), _ => new ConcurrentQueue<long>()).Enqueue(cur); | |
} | |
foreach (var item in entity.From) | |
{ | |
fields[(int)Fields.From] | |
.GetOrAdd(item.ToString().ToLower(), _ => new ConcurrentQueue<long>()).Enqueue(cur); | |
} | |
foreach (var item in Process(entity.Subject)) | |
{ | |
fields[(int)Fields.Subject] | |
.GetOrAdd(item, _ => new ConcurrentQueue<long>()).Enqueue(cur); | |
} | |
foreach (var item in Process(entity.GetTextBody(TextFormat.Plain))) | |
{ | |
fields[(int)Fields.Body] | |
.GetOrAdd(item, _ => new ConcurrentQueue<long>()).Enqueue(cur); | |
} | |
fields[(int)Fields.Date].GetOrAdd(entity.Date.ToString("r"), _ => new ConcurrentQueue<long>()).Enqueue(cur); | |
docs.TryAdd(cur, new DocRef | |
{ | |
Id = entity.MessageId, | |
Path = stream.Name, | |
Number = cur | |
}); | |
} | |
} | |
}); | |
tasks.Add(task); | |
} | |
var so = Stopwatch.StartNew(); | |
tasks.Add(Task.Run(() => | |
{ | |
foreach (var file in Directory.EnumerateFiles(dir, "*", SearchOption.AllDirectories)) | |
{ | |
blockingCollection.Add(file); | |
} | |
blockingCollection.CompleteAdding(); | |
})); | |
var final = Task.WhenAll(tasks.ToArray()); | |
while (final.Wait(5000) == false) | |
{ | |
Console.WriteLine(docs.Count); | |
} | |
Console.WriteLine(GC.GetTotalMemory(true)); | |
Console.WriteLine(so.Elapsed); | |
Console.Beep(); | |
foreach (var item in fields[(int)Fields.Body].OrderByDescending(x => x.Value.Count).Take(15)) | |
{ | |
Console.WriteLine(item.Key + " " + item.Value.Count); | |
} | |
SearchBody(); | |
Console.ReadLine(); | |
GC.KeepAlive(docs); | |
GC.KeepAlive(fields); | |
} | |
private static void SearchBody() | |
{ | |
while (true) | |
{ | |
Console.Write(" > "); | |
var term = Console.ReadLine(); | |
if (string.IsNullOrEmpty(term)) | |
break; | |
if (fields[(int)Fields.Body].TryGetValue(term.ToLower(), out var matches)) | |
{ | |
foreach (var item in matches) | |
{ | |
Console.WriteLine(docs[item].Id + " " + docs[item].Path); | |
} | |
} | |
else | |
{ | |
Console.WriteLine("No matches!!"); | |
} | |
} | |
} | |
private static HashSet<string> Process(string text) | |
{ | |
return text | |
.Split(spearators, StringSplitOptions.RemoveEmptyEntries) | |
.Select(x => x.Trim(trim).ToLower()) | |
.Where(x => | |
{ | |
if (stopWords.Contains(x)) | |
return false; | |
if (x.Length >= 3) | |
return true; | |
if (x.Length == 0) | |
return false; | |
return char.IsDigit(x[0]); | |
}) | |
.ToHashSet(); | |
} | |
} | |
} |
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