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235 lines
9.2 KiB
235 lines
9.2 KiB
#!/usr/bin/env python3
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import shutil
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import os
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import threading
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import paramiko
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import shepherd.config as shconf
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import shepherd.plugin
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# configdef = shepherd.config.definition()
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# Can either import shepherd.config here, and call a function to build a config_def
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# or can leave a config_def entry point.
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# probably go with entry point, to stay consistent with the module
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# on server side, we want to be able to list commands that a module responds to
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# without actually instantiating the module class. Add command templates into
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# the conf_def, than attach to them in the interface? Was worried about having
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# "two sources of truth", but you already need to match the conf_def to the
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# name where you access the value in the module. Could have add_command, which
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# you then add standard conf_def subclasses to, to reuse validation and server
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# form generation logic...
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# The uploader plugin allows the definition of upload "buckets" - essentially
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# as a way of collecting together settings for upload, timing, and retention settings
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# Buckets will ignore any filenames ending with ".writing" or ".uploaded"
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# The "move_to_bucket" interface function is provided, but bucket directories will
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# also work with any files moved into them externally.
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class Destination():
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def __init__(self, config, node_id, root_dir):
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self.config = config
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self.node_id = node_id
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self.root_dir = root_dir
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self.sendlist_condition = threading.Condition()
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self.send_list = []
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self.thread = threading.Thread(target=self._send_files)
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self.thread.start()
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# Override this in subclasses, implementing the actual upload process.
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# Return true on success, false on failure.
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def upload(self, filepath, suffix):
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print("Dummy uploading "+filepath)
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return True
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def add_files_to_send(self, file_path_list):
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self.sendlist_condition.acquire()
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for file_path in file_path_list:
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if file_path not in self.send_list:
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self.send_list.append(file_path)
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self.sendlist_condition.notify()
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self.sendlist_condition.release()
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def _file_available(self):
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return len(self.send_list) > 0
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def _send_files(self):
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while True:
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self.sendlist_condition.acquire()
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# this drops through immediately if there is something to send, otherwise waits
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self.sendlist_condition.wait_for(self._file_available)
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file_to_send = self.send_list.pop(0)
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os.rename(file_to_send, file_to_send+".uploading")
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self.sendlist_condition.release()
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# Rename uploaded file to end with ".uploaded" on success, or back
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# to original path on failure.
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try:
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self.upload(file_to_send, ".uploading")
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os.rename(file_to_send+".uploading", file_to_send+".uploaded")
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except Exception as e:
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print(F"Upload failed with exception {e}")
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os.rename(file_to_send+".uploading", file_to_send)
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self.send_list.append(file_to_send)
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class SFTPDestination(Destination):
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def upload(self, filepath, suffix):
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print("Starting upload...")
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with paramiko.Transport((self.config["address"],
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self.config["port"])) as transport:
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transport.connect(username=self.config["username"],
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password=self.config["password"])
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with paramiko.SFTPClient.from_transport(transport) as sftp:
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print("Uploading "+filepath+" to " +
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self.config["address"]+" via SFTP")
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if self.config["add_id_to_path"]:
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destdir = os.path.join(self.config["path"],
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self.node_id)
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else:
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destdir = self.config["path"]
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try:
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sftp.listdir(destdir)
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except IOError:
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print("Creating remot dir:" + destdir)
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sftp.mkdir(destdir)
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print("Target dir:"+destdir)
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sftp.put(filepath+suffix,
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os.path.join(destdir, os.path.basename(filepath)))
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class Bucket():
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def __init__(self, name, open_link_on_new, opportunistic, keep_copy,
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destination, node_id, root_dir, path=None, old_path=None):
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self.newfile_event = threading.Event()
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self.newfile_event.set()
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self.node_id = node_id
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self.root_dir = root_dir
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self.destination = destination
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self.path = path
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if self.path is None:
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self.path = os.path.join(self.root_dir, name)
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if not os.path.exists(self.path):
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os.makedirs(self.path)
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if keep_copy:
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self.old_path = old_path
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if self.old_path is None:
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self.old_path = os.path.join(
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self.root_dir, name + "_old")
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if not os.path.exists(self.old_path):
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os.makedirs(self.old_path)
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self.thread = threading.Thread(target=self._check_files)
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self.thread.start()
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def _check_files(self):
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while True:
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# NOTE: The reason we use an event here, rather than a lock or condition
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# is that we're not sharing any internal state between the threads - just
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# the filesystem itself and using the atomicity of file operations. While
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# less clean in a pure python sense, this allows for more flexibility in
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# allowing other sources of files
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self.newfile_event.wait(timeout=10)
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self.newfile_event.clear()
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bucket_files = []
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for item in os.listdir(self.path):
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item_path = os.path.join(self.path, item)
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if (os.path.isfile(item_path) and
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(not item.endswith(".writing")) and
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(not item.endswith(".uploading")) and
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(not item.endswith(".uploaded"))):
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bucket_files.append(item_path)
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# TODO check for .uploaded files and either delete or
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# if keep_copy, move to self.old_path
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if bucket_files:
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self.destination.add_files_to_send(bucket_files)
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class UploaderPlugin(shepherd.plugin.Plugin):
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@staticmethod
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def define_config(confdef):
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dests = confdef.add_def('destination', shconf.DictListDef())
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dests.add_def('name', shconf.StringDef())
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dests.add_def('protocol', shconf.StringDef())
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dests.add_def('address', shconf.StringDef(optional=True))
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dests.add_def('port', shconf.IntDef(optional=True))
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dests.add_def('path', shconf.StringDef(optional=True))
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dests.add_def('username', shconf.StringDef(optional=True))
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dests.add_def('password', shconf.StringDef(optional=True))
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dests.add_def('keyfile', shconf.StringDef(
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default="", optional=True))
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dests.add_def('add_id_to_path', shconf.BoolDef(
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default=True, optional=True))
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buckets = confdef.add_def('bucket', shconf.DictListDef())
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buckets.add_def('name', shconf.StringDef())
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buckets.add_def('open_link_on_new', shconf.BoolDef())
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buckets.add_def('opportunistic', shconf.BoolDef(
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default=True, optional=True))
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buckets.add_def('keep_copy', shconf.BoolDef())
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buckets.add_def('destination', shconf.StringDef())
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def __init__(self, pluginInterface, config):
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super().__init__(pluginInterface, config)
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self.config = config
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self.interface = pluginInterface
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self.plugins = pluginInterface.other_plugins
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self.hooks = pluginInterface.hooks
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self.root_dir = os.path.expanduser(pluginInterface.coreconfig["root_dir"])
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self.id = pluginInterface.coreconfig["id"]
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print("Uploader config:")
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print(self.config)
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self.interface.register_function(self.move_to_bucket)
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self.destinations = {}
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self.buckets = {}
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for dest_conf in self.config["destination"]:
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if dest_conf["protocol"] == "sftp":
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self.destinations[dest_conf["name"]] = SFTPDestination(
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dest_conf, self.id, self.root_dir)
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else:
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self.destinations[dest_conf["name"]] = Destination(
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dest_conf, self.id, self.root_dir)
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for bucketconf in self.config["bucket"]:
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bucketconf["destination"] = self.destinations[bucketconf["destination"]]
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self.buckets[bucketconf["name"]] = Bucket(
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**bucketconf, node_id=self.id, root_dir=self.root_dir)
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def move_to_bucket(self, filepath, bucket_name):
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# use intermediary step with ".writing" on the filename
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# in case the source isn't in the same filesystem and so the
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# move operation might not be atomic. Once it's there, the rename
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# _is_ atomic
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dest_path = os.path.join(self.buckets[bucket_name].path,
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os.path.basename(filepath))
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temp_dest_path = dest_path + ".writing"
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shutil.move(filepath, temp_dest_path)
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os.rename(temp_dest_path, dest_path)
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# notify bucket to check for new files
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self.buckets[bucket_name].newfile_event.set()
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if __name__ == "__main__":
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pass
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# print("main")
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# main(sys.argv[1:])
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