Added reverse sync

[osm/common.git] / osm_common / fsmongo.py

diff --git a/osm_common/fsmongo.py b/osm_common/fsmongo.py
index 740d540..f43dca6 100644 (file)
--- a/osm_common/fsmongo.py
+++ b/osm_common/fsmongo.py
@@ -21,6 +21,7 @@ from http import HTTPStatus
 from io import BytesIO, StringIO
 import logging
 import os
+import datetime
 
 from gridfs import GridFSBucket, errors
 from osm_common.fsbase import FsBase, FsException
@@ -325,6 +326,10 @@ class FsMongo(FsBase):
             if exception_file:
                 raise FsException("Multiple files found", http_code=HTTPStatus.INTERNAL_SERVER_ERROR)
 
+            # if no special mode is required just check it does exists
+            if not mode:
+                return True
+
             if requested_file.metadata["type"] == mode:
                 return True
 
@@ -472,4 +477,115 @@ class FsMongo(FsBase):
         :param from_path: if supplied, only copy content from this path, not all
         :return: None
         """
+        if from_path:
+            if os.path.isabs(from_path):
+                from_path = os.path.relpath(from_path, self.path)
         self.__update_local_fs(from_path=from_path)
+
+    def _update_mongo_fs(self, from_path):
+
+        os_path = self.path + from_path
+
+        # Obtain list of files and dirs in filesystem
+        members = []
+        for root, dirs, files in os.walk(os_path):
+            for folder in dirs:
+                member = {
+                    "filename": os.path.join(root, folder),
+                    "type": "dir"
+                }
+                members.append(member)
+            for file in files:
+                filename = os.path.join(root, file)
+                if os.path.islink(filename):
+                    file_type = "sym"
+                else:
+                    file_type = "file"
+                member = {
+                    "filename": os.path.join(root, file),
+                    "type": file_type
+                }
+                members.append(member)
+
+        # Obtain files in mongo dict
+        remote_files = self._get_mongo_files(from_path)
+
+        # Upload members if they do not exists or have been modified
+        # We will do this for performance (avoid updating unmodified files) and to avoid
+        # updating a file with an older one in case there are two sources for synchronization
+        # in high availability scenarios
+        for member in members:
+            # obtain permission
+            mask = int(oct(os.stat(member["filename"]).st_mode)[-3:], 8)
+
+            # convert to relative path
+            rel_filename = os.path.relpath(member["filename"], self.path)
+            last_modified_date = datetime.datetime.fromtimestamp(os.path.getmtime(member["filename"]))
+
+            remote_file = remote_files.get(rel_filename)
+            upload_date = remote_file[0].uploadDate if remote_file else datetime.datetime.min
+            # remove processed files from dict
+            remote_files.pop(rel_filename, None)
+
+            if last_modified_date >= upload_date:
+
+                stream = None
+                fh = None
+                try:
+                    file_type = member["type"]
+                    if file_type == "dir":
+                        stream = BytesIO()
+                    elif file_type == "sym":
+                        stream = BytesIO(os.readlink(member["filename"]).encode("utf-8"))
+                    else:
+                        fh = open(member["filename"], "rb")
+                        stream = BytesIO(fh.read())
+
+                    metadata = {
+                        "type": file_type,
+                        "permissions": mask
+                    }
+
+                    self.fs.upload_from_stream(
+                        rel_filename,
+                        stream,
+                        metadata=metadata
+                    )
+
+                    # delete old files
+                    if remote_file:
+                        for file in remote_file:
+                            self.fs.delete(file._id)
+                finally:
+                    if fh:
+                        fh.close()
+                    if stream:
+                        stream.close()
+
+        # delete files that are not any more in local fs
+        for remote_file in remote_files.values():
+            for file in remote_file:
+                self.fs.delete(file._id)
+
+    def _get_mongo_files(self, from_path=None):
+
+        file_dict = {}
+        file_cursor = self.fs.find(no_cursor_timeout=True, sort=[('uploadDate', -1)])
+        for file in file_cursor:
+            if from_path and not file.filename.startswith(from_path):
+                continue
+            if file.filename in file_dict:
+                file_dict[file.filename].append(file)
+            else:
+                file_dict[file.filename] = [file]
+        return file_dict
+
+    def reverse_sync(self, from_path: str):
+        """
+        Sync from local storage to FSMongo
+        :param from_path: base directory to upload content to mongo fs
+        :return: None
+        """
+        if os.path.isabs(from_path):
+            from_path = os.path.relpath(from_path, self.path)
+        self._update_mongo_fs(from_path=from_path)