Moving large transfers to recursive resource segmentation
This commit is contained in:
Mark Qvist
parent
4a3ee622ec
commit
6b2b66aa25
@ -135,16 +135,14 @@ def client_request(message, packet):
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# read it and pack it as a resource
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RNS.log("Client requested \""+filename+"\"")
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file = open(os.path.join(serve_path, filename), "rb")
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file_data = file.read()
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file.close()
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file_resource = RNS.Resource(file_data, packet.link, callback=resource_sending_concluded)
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file_resource = RNS.Resource(file, packet.link, callback=resource_sending_concluded)
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file_resource.filename = filename
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except:
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except Exception as e:
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# If somethign went wrong, we close
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# the link
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RNS.log("Error while reading file \""+filename+"\"", RNS.LOG_ERROR)
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packet.link.teardown()
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raise e
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else:
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# If we don't have it, we close the link
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RNS.log("Client requested an unknown file")
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@ -484,7 +482,7 @@ def download_concluded(resource):
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try:
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file = open(saved_filename, "wb")
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file.write(resource.data)
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file.write(resource.data.read())
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file.close()
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menu_mode = "download_concluded"
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except:
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227
RNS/Bundle.py
227
RNS/Bundle.py
@ -1,227 +0,0 @@
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import RNS
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import time
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import os
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import os.path
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from .vendor import umsgpack as umsgpack
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class Bundle:
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APP_NAME = "rnsbundle"
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NO_CUSTODY = 0x00;
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TAKING_CUSTODY = 0x01;
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FULL_CUSTODY = 0x02;
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REMOVED = 0xFF;
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CHUNK_SIZE = RNS.Resource.MAX_EFFICIENT_SIZE / 4
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def __init__(self, destination_hash = None, data = None, filepath = None, advertisement_data = None):
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self.destination_hash = None
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self.is_originator = False
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self.state = None
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self.data_file = None
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self.meta_file = None
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self.data_hash = None
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self.id = None
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self.storagepath = None
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self.size = None
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self.chunks = 0
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self.created = time.time()
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self.heartbeat = created
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self.transferring = False
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self.chunk_request_destination = None
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try:
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if data != None or filepath != None:
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self.destination_hash = destination_hash
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self.is_originator = True
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self.id = RNS.Identity.getRandomHash()
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if filepath == None and data != None:
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try:
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self.data_hash = RNS.Identity.fullHash(data)
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self.storagepath = Reticulum.bundlepath+"/"+self.id.hex()
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self.datapath = self.storagepath+"/data"
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self.metadatapath = self.storagepath+"/metadata"
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if not os.path.isdir(self.storagepath):
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os.makedirs(self.storagepath)
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else:
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RNS.log("Warning, bundle already exists in storage location, recreating", RNS.LOG_DEBUG)
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self.data_file = open(self.datapath, "wb")
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self.data_file.write(data)
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self.data_file.close()
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except Exception as e:
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RNS.log("Error while initialising bundle from data, the contained exception was:", RNS.LOG_ERROR)
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RNS.log(str(e))
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self.state = Bundle.FULL_CUSTODY
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elif data == None and filepath != None:
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try:
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input_file = open(filepath, "rb")
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self.data_hash = RNS.Identity.fullHash(input_file.read())
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input_file.seek(0)
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self.storagepath = RNS.Reticulum.bundlepath+"/"+self.id.hex()
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self.datapath = self.storagepath+"/data"
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self.metadatapath = self.storagepath+"/metadata"
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if not os.path.isdir(self.storagepath):
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os.makedirs(self.storagepath)
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else:
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RNS.log("Warning, bundle already exists in storage location, recreating", RNS.LOG_DEBUG)
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self.data_file = open(self.datapath, "wb")
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self.data_file.write(input_file.read())
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self.data_file.close()
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input_file.close()
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except Exception as e:
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RNS.log("Error while reading input file for bundle, the contained exception was:", RNS.LOG_ERROR)
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RNS.log(str(e))
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self.state = Bundle.FULL_CUSTODY
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else:
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raise ValueError("Bundle cannot be created from data and file path at the same time")
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# Prepare file handles and metadata
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self.size = os.stat(self.datapath).st_size
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if self.size < 1:
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raise IOError("Bundle data is empty")
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self.data_file = open(self.datapath, "rb")
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elif advertisement_data != None:
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# Incoming bundle transfer
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self.id = advertisement_data[1]
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self.destination_hash = advertisement_data[0]
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self.state = Bundle.TAKING_CUSTODY
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self.storagepath = Reticulum.bundlepath+"/"+self.id.hex()
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self.datapath = self.storagepath+"/data"
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self.metadatapath = self.storagepath+"/metadata"
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if not os.path.isdir(self.storagepath):
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os.makedirs(self.storagepath)
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else:
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RNS.log("Warning, bundle already exists in storage location, recreating", RNS.LOG_DEBUG)
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self.data_file = open(self.datapath, "wb")
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self.data_file.close()
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self.size = advertisement_data[2]
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self.data_file = open(self.datapath, "wb")
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else:
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raise ValueError("No source of data specified for bundle initialisation")
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self.chunks = ((self.size-1)//Bundle.CHUNK_SIZE)+1
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self.flush_metadata()
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RNS.Transport.register_bundle(self)
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except Exception as e:
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RNS.log("Error while initialising bundle. The contained exception was:", RNS.LOG_ERROR)
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RNS.log(str(e), RNS.LOG_ERROR)
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# TODO: Remove
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raise e
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def get_packed_metadata(self):
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metadata = {
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"destination": self.destination,
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"heartbeat": self.heartbeat,
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"size": self.size,
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"is_originator": self.is_originator
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"state": self.state}
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return umsgpack.packb(metadata)
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def flush_metadata(self):
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try:
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self.meta_file = open(self.metadatapath, "wb")
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self.meta_file.write(self.get_packed_metadata())
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self.meta_file.close()
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except Exception as e:
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RNS.log("Error while flushing metadata for bundle "+RNS.prettyhexrep(self.id), RNS.LOG_ERROR)
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RNS.log("The contained exception was: "+str(e), RNS.LOG_ERROR)
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def register_destinations(self, destination):
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self.chunk_request_destination = RNS.Destination(None, RNS.Destination.IN, RNS.Destination.SINGLE, APP_NAME, "chunk", "request")
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self.chunk_request_destination.link_established_callback(requester_connected)
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def advertise(self, advertise_to):
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advertisement = [
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self.destination,
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self.id,
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self.size,
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self.chunks]
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advertisement_data = umsgpack.packb(advertisement)
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advertisement_packet = RNS.Packet(advertise_to, advertisement_data)
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advertisement.packet.send()
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def requester_connected(self, link):
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RNS.log("Requester connected to bundle "+RNS.prettyhexrep(self.id), RNS.LOG_DEBUG)
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link.packet_callback(chunk_request)
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def chunk_request(self, data, packet):
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chunk_index = data[0]
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RNS.log("Request for chunk "+str(chunk_index)+"/"+str(self.chunks)+" of bundle "+RNS.prettyhexrep(self.id), RNS.LOG_DEBUG)
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if chunk_index < self.chunks:
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self.emit_resource(packet.link, chunk_index)
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else:
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RNS.log("Bundle transfer client requested chunk index out of range, tearing down link.", RNS.LOG_ERROR)
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packet.link.teardown()
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def emit_resource(self, link, chunk_index):
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if not self.transferring:
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chunk_max = self.size-1
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chunk_start = chunk_index*CHUNK_SIZE
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chunk_end = (chunk_index+1)*CHUNK_SIZE-1
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if chunk_end > chunk_max:
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chunk_end = chunk_max
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read_size = chunk_end - chunk_start
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try:
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file = open(self.datapath, "rb")
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file.seek(chunk_start)
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data = file.read(read_size)
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chunk_resource = RNS.Resource(data, link, callback=resource_concluded)
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chunk_resource.chunk_index = chunk_index
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except Exception as e:
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RNS.log("Could not read bundle data from storage, the contained exception was:", RNS.LOG_ERROR)
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RNS.log(str(e))
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link.teardown()
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else:
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RNS.log("Bundle chunk "+str(chunk_index)+" for "+RNS.prettyhexrep(self.id)+" was requested while a transfer was already in progress", RNS.LOG_ERROR)
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def resource_concluded(self, resource):
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RNS.log("Concluded transferring chunk "+str(resource.chunk_index)+"/"+str(self.chunks)+" of bundle "+RNS.prettyhexrep(self.id), RNS.LOG_DEBUG)
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self.transferring = False
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def resign_custody(self):
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self.state = Bundle.NO_CUSTODY
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self.heartbeat = time.time()
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def custody_proof(self, proof):
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pass
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def remove(self):
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try:
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self.state = Bundle.REMOVED
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RNS.Transport.deregister_destination(self.chunk_request_destination)
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os.unlink(self.datapath)
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os.unlink(self.metadatapath)
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os.rmdir(self.storagepath)
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except Exception as e:
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RNS.log("Error while removing bundle from storage, the contained exception was:", RNS.LOG_ERROR)
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RNS.log(str(e), RNS.LOG_ERROR)
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class BundleAdvertisement:
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pass
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133
RNS/Resource.py
133
RNS/Resource.py
@ -1,4 +1,5 @@
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import RNS
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import os
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import bz2
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import math
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import time
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@ -63,6 +64,7 @@ class Resource:
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resource.size = adv.t
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resource.uncompressed_size = adv.d
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resource.hash = adv.h
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resource.original_hash = adv.o
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resource.random_hash = adv.r
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resource.hashmap_raw = adv.m
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resource.encrypted = True if resource.flags & 0x01 else False
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@ -80,6 +82,14 @@ class Resource:
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resource.window_flexibility = Resource.WINDOW_FLEXIBILITY
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resource.last_activity = time.time()
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resource.storagepath = RNS.Reticulum.resourcepath+"/"+resource.original_hash.hex()
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resource.segment_index = adv.i
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resource.total_segments = adv.l
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if adv.l > 1:
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resource.split = True
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else:
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resource.split = False
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resource.hashmap = [None] * resource.total_parts
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resource.hashmap_height = 0
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resource.waiting_for_hmu = False
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@ -98,11 +108,53 @@ class Resource:
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resource.watchdog_job()
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return resource
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except:
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except Exception as e:
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RNS.log("Could not decode resource advertisement, dropping resource", RNS.LOG_DEBUG)
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# TODO: Remove
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raise e
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return None
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def __init__(self, data, link, advertise=True, auto_compress=True, must_compress=False, callback=None, progress_callback=None):
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# Create a resource for transmission to a remote destination
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# The data passed can be either a bytes-array or a file opened
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# in binary read mode.
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def __init__(self, data, link, advertise=True, auto_compress=True, must_compress=False, callback=None, progress_callback=None, segment_index = 1, original_hash = None):
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data_size = None
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resource_data = None
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if hasattr(data, "read"):
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data_size = os.stat(data.name).st_size
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if data_size <= Resource.MAX_EFFICIENT_SIZE:
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self.total_segments = 1
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self.segment_index = 1
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self.split = False
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resource_data = data.read()
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data.close()
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else:
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self.total_segments = ((data_size-1)//Resource.MAX_EFFICIENT_SIZE)+1
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self.segment_index = segment_index
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self.split = True
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seek_index = segment_index-1
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seek_position = seek_index*Resource.MAX_EFFICIENT_SIZE
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data.seek(seek_position)
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resource_data = data.read(Resource.MAX_EFFICIENT_SIZE)
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self.input_file = data
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elif isinstance(data, bytes):
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data_size = len(data)
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resource_data = data
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self.total_segments = 1
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self.segment_index = 1
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self.split = False
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elif data == None:
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pass
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else:
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raise TypeError("Invalid data instance type passed to resource initialisation")
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data = resource_data
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self.status = Resource.NONE
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self.link = link
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self.max_retries = Resource.MAX_RETRIES
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@ -115,6 +167,7 @@ class Resource:
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self.__watchdog_job_id = 0
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self.__progress_callback = progress_callback
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self.rtt = None
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self.grand_total_parts = math.ceil(data_size/Resource.SDU)
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self.receiver_min_consecutive_height = 0
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@ -179,6 +232,11 @@ class Resource:
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self.hash = RNS.Identity.fullHash(data+self.random_hash)
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self.expected_proof = RNS.Identity.fullHash(data+self.hash)
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if original_hash == None:
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self.original_hash = self.hash
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else:
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self.original_hash = original_hash
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self.parts = []
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self.hashmap = b""
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collision_guard_list = []
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@ -379,6 +437,9 @@ class Resource:
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calculated_hash = RNS.Identity.fullHash(self.data+self.random_hash)
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if calculated_hash == self.hash:
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self.file = open(self.storagepath, "ab")
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self.file.write(self.data)
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self.file.close()
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self.status = Resource.COMPLETE
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self.prove()
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else:
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@ -390,10 +451,22 @@ class Resource:
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RNS.log("The contained exception was: "+str(e), RNS.LOG_ERROR)
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self.status = Resource.CORRUPT
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if self.callback != None:
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self.link.resource_concluded(self)
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if self.segment_index == self.total_segments:
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if self.callback != None:
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self.data = open(self.storagepath, "rb")
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self.callback(self)
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try:
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self.data.close()
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os.unlink(self.storagepath)
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except Exception as e:
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RNS.log("Error while cleaning up resource files, the contained exception was:", RNS.LOG_ERROR)
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RNS.log(str(e))
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else:
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RNS.log("Resource segment "+str(self.segment_index)+" of "+str(self.total_segments)+" received, waiting for next segment to be announced", RNS.LOG_VERBOSE)
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def prove(self):
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if not self.status == Resource.FAILED:
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@ -412,9 +485,16 @@ class Resource:
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if len(proof_data) == RNS.Identity.HASHLENGTH//8*2:
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if proof_data[RNS.Identity.HASHLENGTH//8:] == self.expected_proof:
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self.status = Resource.COMPLETE
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if self.callback != None:
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self.link.resource_concluded(self)
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if self.segment_index == self.total_segments:
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# If all segments were processed, we'll
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# signal that the resource sending concluded
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if self.callback != None:
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self.callback(self)
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else:
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# Otherwise we'll recursively create the
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# next segment of the resource
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Resource(self.input_file, self.link, callback = self.callback, segment_index = self.segment_index+1, original_hash=self.original_hash)
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else:
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pass
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else:
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@ -637,9 +717,21 @@ class Resource:
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def progress(self):
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if self.initiator:
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progress = self.sent_parts / len(self.parts)
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# TODO: Remove
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# progress = self.sent_parts / len(self.parts)
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self.processed_parts = (self.segment_index-1)*math.ceil(Resource.MAX_EFFICIENT_SIZE/Resource.SDU)
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self.processed_parts += self.sent_parts
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self.progress_total_parts = float(self.grand_total_parts)
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else:
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progress = self.received_count / float(self.total_parts)
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self.processed_parts = (self.segment_index-1)*math.ceil(Resource.MAX_EFFICIENT_SIZE/Resource.SDU)
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self.processed_parts += self.received_count
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if self.split:
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self.progress_total_parts = float((self.total_segments-1)*math.ceil(Resource.MAX_EFFICIENT_SIZE/Resource.SDU)+self.total_parts)
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else:
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self.progress_total_parts = float(self.total_parts)
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progress = self.processed_parts / self.progress_total_parts
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return progress
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def __str__(self):
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@ -647,7 +739,7 @@ class Resource:
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class ResourceAdvertisement:
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HASHMAP_MAX_LEN = 84
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HASHMAP_MAX_LEN = 75
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COLLISION_GUARD_SIZE = 2*Resource.WINDOW_MAX+HASHMAP_MAX_LEN
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def __init__(self, resource=None):
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@ -657,26 +749,33 @@ class ResourceAdvertisement:
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self.n = len(resource.parts) # Number of parts
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self.h = resource.hash # Resource hash
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self.r = resource.random_hash # Resource random hash
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self.o = resource.original_hash # First-segment hash
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self.m = resource.hashmap # Resource hashmap
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self.c = resource.compressed # Compression flag
|
||||
self.e = resource.encrypted # Encryption flag
|
||||
self.f = 0x00 | self.c << 1 | self.e # Flags
|
||||
self.s = resource.split # Split flag
|
||||
self.i = resource.segment_index # Segment index
|
||||
self.l = resource.total_segments # Total segments
|
||||
self.f = 0x00 | self.s << 2 | self.c << 1 | self.e # Flags
|
||||
|
||||
def pack(self, segment=0):
|
||||
hashmap_start = segment*ResourceAdvertisement.HASHMAP_MAX_LEN
|
||||
hashmap_end = min((segment+1)*ResourceAdvertisement.HASHMAP_MAX_LEN, self.n)
|
||||
hashmap_end = min((segment+1)*(ResourceAdvertisement.HASHMAP_MAX_LEN), self.n)
|
||||
|
||||
hashmap = b""
|
||||
for i in range(hashmap_start,hashmap_end):
|
||||
hashmap += self.m[i*Resource.MAPHASH_LEN:(i+1)*Resource.MAPHASH_LEN]
|
||||
|
||||
dictionary = {
|
||||
"t": self.t,
|
||||
"d": self.d,
|
||||
"n": self.n,
|
||||
"h": self.h,
|
||||
"r": self.r,
|
||||
"f": self.f,
|
||||
"t": self.t, # Transfer size
|
||||
"d": self.d, # Data size
|
||||
"n": self.n, # Number of parts
|
||||
"h": self.h, # Resource hash
|
||||
"r": self.r, # Resource random hash
|
||||
"o": self.o, # Original hash
|
||||
"i": self.i, # Segment index
|
||||
"l": self.l, # Total segments
|
||||
"f": self.f, # Resource flags
|
||||
"m": hashmap
|
||||
}
|
||||
|
||||
@ -692,9 +791,13 @@ class ResourceAdvertisement:
|
||||
adv.n = dictionary["n"]
|
||||
adv.h = dictionary["h"]
|
||||
adv.r = dictionary["r"]
|
||||
adv.o = dictionary["o"]
|
||||
adv.m = dictionary["m"]
|
||||
adv.f = dictionary["f"]
|
||||
adv.i = dictionary["i"]
|
||||
adv.l = dictionary["l"]
|
||||
adv.e = True if (adv.f & 0x01) == 0x01 else False
|
||||
adv.c = True if ((adv.f >> 1) & 0x01) == 0x01 else False
|
||||
adv.s = True if ((adv.f >> 2) & 0x01) == 0x01 else False
|
||||
|
||||
return adv
|
||||
@ -34,7 +34,7 @@ class Reticulum:
|
||||
Reticulum.configpath = Reticulum.configdir+"/config"
|
||||
Reticulum.storagepath = Reticulum.configdir+"/storage"
|
||||
Reticulum.cachepath = Reticulum.configdir+"/storage/cache"
|
||||
Reticulum.bundlepath = Reticulum.configdir+"/storage/bundles"
|
||||
Reticulum.resourcepath = Reticulum.configdir+"/storage/resources"
|
||||
|
||||
Reticulum.__allow_unencrypted = False
|
||||
Reticulum.__transport_enabled = False
|
||||
@ -53,8 +53,8 @@ class Reticulum:
|
||||
if not os.path.isdir(Reticulum.cachepath):
|
||||
os.makedirs(Reticulum.cachepath)
|
||||
|
||||
if not os.path.isdir(Reticulum.bundlepath):
|
||||
os.makedirs(Reticulum.bundlepath)
|
||||
if not os.path.isdir(Reticulum.resourcepath):
|
||||
os.makedirs(Reticulum.resourcepath)
|
||||
|
||||
if os.path.isfile(self.configpath):
|
||||
try:
|
||||
|
||||
@ -43,9 +43,6 @@ class Transport:
|
||||
DESTINATION_TIMEOUT = 60*60*24*7 # Destination table entries are removed if unused for one week
|
||||
MAX_RECEIPTS = 1024 # Maximum number of receipts to keep track of
|
||||
|
||||
BUNDLE_TIMEOUT = 60*60*24*7 # Bundles time out after 7 days
|
||||
BUNDLE_INTERVAL = 180 # How often we should attempt to transfer bundles to their next hop
|
||||
|
||||
interfaces = [] # All active interfaces
|
||||
destinations = [] # All active destinations
|
||||
pending_links = [] # Links that are being established
|
||||
@ -58,7 +55,6 @@ class Transport:
|
||||
destination_table = {} # A lookup table containing the next hop to a given destination
|
||||
reverse_table = {} # A lookup table for storing packet hashes used to return proofs and replies
|
||||
link_table = {} # A lookup table containing hops for links
|
||||
bundle_table = {} # A table for holding references to bundles in transport
|
||||
held_announces = {} # A table containing temporarily held announce-table entries
|
||||
|
||||
# Transport control destinations are used
|
||||
@ -112,16 +108,9 @@ class Transport:
|
||||
# Create transport-specific destinations
|
||||
Transport.path_request_destination = RNS.Destination(None, RNS.Destination.IN, RNS.Destination.PLAIN, Transport.APP_NAME, "path", "request")
|
||||
Transport.path_request_destination.packet_callback(Transport.path_request_handler)
|
||||
|
||||
Transport.bundle_advertisement_destination = RNS.Destination(None, RNS.Destination.IN, RNS.Destination.PLAIN, Transport.APP_NAME, "bundle", "advertisement", )
|
||||
Transport.bundle_advertisement_destination.packet_callback(Transport.bundle_advertisement_handler)
|
||||
|
||||
Transport.control_destinations.append(Transport.path_request_destination)
|
||||
Transport.control_hashes.append(Transport.path_request_destination.hash)
|
||||
|
||||
Transport.control_destinations.append(Transport.bundle_advertisement_destination)
|
||||
Transport.control_hashes.append(Transport.bundle_advertisement_destination.hash)
|
||||
|
||||
thread = threading.Thread(target=Transport.jobloop)
|
||||
thread.setDaemon(True)
|
||||
thread.start()
|
||||
@ -311,8 +300,6 @@ class Transport:
|
||||
|
||||
Transport.tables_last_culled = time.time()
|
||||
|
||||
Transport.bundle_jobs()
|
||||
|
||||
except Exception as e:
|
||||
RNS.log("An exception occurred while running Transport jobs.", RNS.LOG_ERROR)
|
||||
RNS.log("The contained exception was: "+str(e), RNS.LOG_ERROR)
|
||||
@ -323,35 +310,6 @@ class Transport:
|
||||
for packet in outgoing:
|
||||
packet.send()
|
||||
|
||||
@staticmethod
|
||||
def bundle_jobs():
|
||||
removed_bundles = []
|
||||
for bundle in Transport.bundle_table:
|
||||
# The bundle could not be passed on within the allowed
|
||||
# time, and should be removed from storage
|
||||
if bundle.heartbeat+Transport.BUNDLE_TIMEOUT < time.time():
|
||||
RNS.log("Removing stale bundle "+RNS.prettyhexrep(bundle.id)+" from storage", RNS.LOG_VERBOSE)
|
||||
removed_bundles.append(bundle)
|
||||
bundle.remove()
|
||||
|
||||
# Custody was transferred to another node, we'll remove the bundle
|
||||
if bundle.state == RNS.Bundle.NO_CUSTODY:
|
||||
RNS.log("Removing bundle "+RNS.prettyhexrep(bundle.id)+" from storage since custody was transferred", RNS.LOG_VERBOSE)
|
||||
removed_bundles.append(bundle)
|
||||
bundle.remove()
|
||||
|
||||
# This is an incoming bundle, attempt to retrieve it
|
||||
if bundle.state == RNS.Bundle.TAKING_CUSTODY:
|
||||
pass
|
||||
|
||||
# We have custody over this bundle, and we should attempt
|
||||
# to deliver it to it's next hop.
|
||||
if bundle.state == RNS.Bundle.FULL_CUSTODY:
|
||||
pass
|
||||
|
||||
for bundle in removed_bundles:
|
||||
Transport.bundle_table.remove(bundle)
|
||||
|
||||
@staticmethod
|
||||
def outbound(packet):
|
||||
while (Transport.jobs_running):
|
||||
@ -458,7 +416,6 @@ class Transport:
|
||||
Transport.jobs_locked = False
|
||||
return sent
|
||||
|
||||
|
||||
@staticmethod
|
||||
def packet_filter(packet):
|
||||
# TODO: Think long and hard about this.
|
||||
@ -917,11 +874,6 @@ class Transport:
|
||||
else:
|
||||
RNS.log("Attempted to activate a link that was not in the pending table", RNS.LOG_ERROR)
|
||||
|
||||
@staticmethod
|
||||
def register_bundle(bundle):
|
||||
RNS.log("Transport instance registered bundle "+RNS.prettyhexrep(bundle.id), RNS.LOG_DEBUG)
|
||||
self.bundle_table.append(bundle)
|
||||
|
||||
@staticmethod
|
||||
def find_interface_from_hash(interface_hash):
|
||||
for interface in Transport.interfaces:
|
||||
@ -1043,10 +995,6 @@ class Transport:
|
||||
packet.receiving_interface
|
||||
)
|
||||
|
||||
@staticmethod
|
||||
def bundle_advertisement_handler(data, packet):
|
||||
pass
|
||||
|
||||
@staticmethod
|
||||
def pathRequest(destination_hash, is_from_local_client, attached_interface):
|
||||
RNS.log("Path request for "+RNS.prettyhexrep(destination_hash), RNS.LOG_DEBUG)
|
||||
|
||||
@ -12,7 +12,6 @@ from .Destination import Destination
|
||||
from .Packet import Packet
|
||||
from .Packet import PacketReceipt
|
||||
from .Resource import Resource
|
||||
from .Bundle import Bundle
|
||||
|
||||
modules = glob.glob(os.path.dirname(__file__)+"/*.py")
|
||||
__all__ = [ os.path.basename(f)[:-3] for f in modules if not f.endswith('__init__.py')]
|
||||
|
||||
Loading…
Reference in New Issue
Block a user