added file reader offset

src/apiservers/private/register_private_blueprints.py

@@ -9,6 +9,7 @@ from httpapi import security, friendsapi, profilesapi, configapi, insertblock
 from httpapi import miscclientapi, onionrsitesapi, apiutils
 from httpapi import directconnections
 from httpapi import themeapi
+from httpapi import fileoffsetreader
 from httpapi.sse.private import private_sse_blueprint
 
 """
@@ -46,6 +47,7 @@ def register_private_blueprints(private_api, app):
         private_api).direct_conn_management_bp)
     app.register_blueprint(themeapi.theme_blueprint)
     app.register_blueprint(private_sse_blueprint)
+    app.register_blueprint(fileoffsetreader.offset_reader_api)
 
     def _add_events_bp():
         while True:

src/httpapi/fileoffsetreader/__init__.py

@@ -0,0 +1,30 @@
+from os.path import exists, dirname
+
+import ujson
+from flask import Blueprint, Response, request
+
+from utils.identifyhome import identify_home
+from utils.readoffset import read_from_offset
+
+offset_reader_api = Blueprint('offsetreaderapi', __name__)
+
+
+@offset_reader_api.route('/readfileoffset/<name>')
+def offset_reader_endpoint(name):
+    if not name[:-4].isalnum():
+        return Response(400, "Path must be alphanumeric except for file ext")
+
+    path = identify_home() + name
+
+    if not exists(path):
+        return Response(404, "Path not found in Onionr data directory")
+
+    offset = request.args.get('offset')
+
+    if not offset:
+        offset = 0
+    else:
+        offset = int(offset)
+    result = read_from_offset(path, offset)._asdict()
+
+    return ujson.dumps(result, reject_bytes=False)

src/utils/readoffset.py

@@ -0,0 +1,17 @@
+"""Onionr - Private P2P Communication.
+
+read from a file from an offset (efficiently)
+"""
+from collections import namedtuple
+
+OffsetReadResult = namedtuple('OffsetReadResult', ['data', 'new_offset'])
+
+
+def read_from_offset(file_path, offset=0):
+    with open(file_path, 'rb') as f:
+        if offset:
+            f.seek(offset)
+        data = f.read()
+        offset = f.tell()
+
+    return OffsetReadResult(data, offset)

tests/test_read_offset.py

@@ -0,0 +1,29 @@
+#!/usr/bin/env python3
+import sys, os
+from time import sleep
+import tempfile
+sys.path.append(".")
+sys.path.append("src/")
+import uuid
+TEST_DIR = 'testdata/%s-%s' % (uuid.uuid4(), os.path.basename(__file__)) + '/'
+print("Test directory:", TEST_DIR)
+os.environ["ONIONR_HOME"] = TEST_DIR
+import unittest, json
+
+from utils import identifyhome, createdirs, readoffset
+from onionrsetup import setup_config
+createdirs.create_dirs()
+setup_config()
+
+class TestReadOffset(unittest.TestCase):
+    def test_read_whole(self):
+        temp = tempfile.mkstemp()[1]
+        f = open(temp, 'wb')
+        data = b"test1\ntest2\ntest3\test4"
+        f.write(data)
+        f.close()
+        self.assertEqual(readoffset.read_from_offset(temp).data, data)
+        os.remove(temp)
+
+
+unittest.main()