From 85264c9ab3052dd844016d3ec44cb8af43dd5869 Mon Sep 17 00:00:00 2001
From: Folker Bernitt <fbernitt@thoughtworks.com>
Date: Wed, 8 Oct 2014 18:06:28 +0200
Subject: Added whoosh as search engine (issue #94).

---
 service/pixelated/adapter/search.py | 71 +++++++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 service/pixelated/adapter/search.py

(limited to 'service/pixelated/adapter/search.py')

diff --git a/service/pixelated/adapter/search.py b/service/pixelated/adapter/search.py
new file mode 100644
index 00000000..6c64cc40
--- /dev/null
+++ b/service/pixelated/adapter/search.py
@@ -0,0 +1,71 @@
+from whoosh.fields import *
+from whoosh.filedb.filestore import RamStorage
+from whoosh.qparser import QueryParser
+
+
+class SearchEngine(object):
+    __slots__ = '_index'
+
+    def __init__(self):
+        self._index = self._create_index()
+
+    def _mail_schema(self):
+        return Schema(
+            ident=ID(stored=True, unique=True),
+            sender=ID(stored=False),
+            to=ID(stored=False),
+            cc=ID(stored=False),
+            bcc=ID(stored=False),
+            subject=TEXT(stored=False),
+            body=TEXT(stored=False),
+            tag=KEYWORD(stored=False, commas=True))
+
+    def _create_index(self):
+        return RamStorage().create_index(self._mail_schema(), indexname='mails')
+
+    def index_mail(self, mail):
+        writer = self._index.writer()
+        self._index_mail(writer, mail)
+        writer.commit()
+
+    def _index_mail(self, writer, mail):
+        mdict = mail.as_dict()
+        header = mdict['header']
+        tags = mdict.get('tags', [])
+        tags.append(mail.mailbox_name.lower())
+        index_data = {
+            'sender': unicode(header.get('from', '')),
+            'subject': unicode(header.get('subject', '')),
+            'to': unicode(header.get('to', '')),
+            'cc': unicode(header.get('cc', '')),
+            'bcc': unicode(header.get('bcc', '')),
+            'tag': u','.join(tags),
+            'body': unicode(mdict['body']),
+            'ident': unicode(mdict['ident'])
+        }
+
+        writer.update_document(**index_data)
+
+    def index_mails(self, mails):
+        writer = self._index.writer()
+        try:
+            for mail in mails:
+                self._index_mail(writer, mail)
+        finally:
+            writer.commit()
+
+    def search(self, query):
+        query = query.replace('\"', '')
+        query = query.replace('-in:', 'AND NOT tag:')
+        query = query.replace('in:all', '*')
+        with self._index.searcher() as searcher:
+            query = QueryParser('body', self._index.schema).parse(query)
+            results = searcher.search(query)
+            return [mail['ident'] for mail in results]
+
+    def remove_from_index(self, mail_id):
+        writer = self._index.writer()
+        try:
+            writer.delete_by_term('ident', mail_id)
+        finally:
+            writer.commit()
-- 
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