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eafsclientlib.py
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eafsclientlib.py
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# -*- coding: utf-8 -*-
'''
* EAFS
* Copyright (C) 2009-2011 Adam Etienne <[email protected]>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation version 3.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
'''
import math,uuid,os,time,operator,random,xmlrpclib,argparse,zlib,threading,hashlib
from eafslib import EAFSChunkServerRpc
class EAFSClientLib():
def __init__(self, master_host, debug=0):
self.debug = debug
self.master = xmlrpclib.ServerProxy(master_host)
self.chunk_size = self.master.get_chunksize()
self.chunkservers = {}
self.chunk_cache = {}
self.chunk_cache_read = {}
self.chunk_cache_read_wait = {}
self.fd = 0
#self.cache_counter = 0
def update_chunkservers(self):
#self.cache_counter -= 1
#if self.cache_counter<=0:
# self.cache_counter = 100
chunkservers = self.master.get_chunkservers()
for chunkserver in chunkservers:
if chunkserver['uuid'] not in self.chunkservers:
print "ADD CHUNKSERVER: ", chunkserver['uuid'], chunkserver['address']
self.chunkservers[chunkserver['uuid']] = EAFSChunkServerRpc( chunkserver['uuid'], chunkserver['address'] )
def write_chunk(self, chunk_uuid, data):
#start = time.time()
write_data = data #zlib.compress(chunks[i])
#print "[write_chunks] compress: ", (time.time()-start)
write_data_xmlrpc = xmlrpclib.Binary(write_data)
chunkserver_uuids = self.master.choose_chunkserver_uuids()
chunkserver_writes = 0
#print "[write_chunk] chunkserver_uuids: ", chunkserver_uuids
for chunkserver_uuid in chunkserver_uuids:
if chunkserver_uuid in self.chunkservers:
#print "chunkserver_uuid: ", chunkserver_uuid
#if self.debug>3: print "Chunk size: ", i, len(chunks[i])
#start = time.time()
#print "writing..."
data_md5 = hashlib.md5(data).hexdigest()
print "[write_chunk] set_md5: %s" % data_md5
self.master.set_chunk_attrs( chunk_uuid, { 'md5':data_md5, 'size':len(data) } )
try:
write_data_len = int( self.chunkservers[chunkserver_uuid].rpc.write(chunk_uuid, write_data_xmlrpc) )
#print "done"
#print "Wrote on chunkserver %s: %d" % (chunkserver_uuid, write_data_len)
#print "[write_chunks] rpc.write: ", (time.time()-start)
if write_data_len==len(write_data):
chunkserver_writes += 1
else:
print "Write on chunkserver %s failed (%d/%d)" % (chunkserver_uuid, write_data_len, len(write_data))
except:
#else:
print "Chunkserver %s failed" % chunkserver_uuid
if chunkserver_uuid in self.chunkservers:
del self.chunkservers[chunkserver_uuid]
if chunkserver_writes==0:
raise Exception("write_chunks error, not enough chunkserver available")
return True
def write_chunks(self, chunkuuids, data):
chunks = [ data[x:x+self.chunk_size] \
for x in range(0, len(data), self.chunk_size) ]
#start = time.time()
self.update_chunkservers()
#print "[write_chunks] update_chunkservers: ", (time.time()-start)
start_total = time.time()
for i in range(0, len(chunkuuids)): # write to each chunkserver
chunkuuid = chunkuuids[i]
self.write_chunk( chunkuuid, chunks[i] )
#print "[write_chunks] total writes: ", (time.time()-start_total)
return True
def num_chunks(self, size):
return (size // self.chunk_size) \
+ (1 if size % self.chunk_size > 0 else 0)
def exists(self, path):
return self.master.exists(path)
def flush_low(self, path, fh, chunk_uuid=0):
if fh not in self.chunk_cache:
return False
if chunk_uuid<>0:
if chunk_uuid not in self.chunk_cache[fh]:
return False
chunk_uuids = [ chunk_uuid ]
else:
chunk_uuids = [ uuid for uuid in self.chunk_cache[fh] ]
self.update_chunkservers()
for chunk_uuid in chunk_uuids:
data = self.chunk_cache[fh][chunk_uuid]
self.write_chunk(chunk_uuid, data)
#del self.chunk_cache[fh][chunk_uuid]
return True
"""
def flush_low(self, path, fh, chunk_offset=0):
if fh not in self.chunk_cache:
return False
if chunk_offset not in self.chunk_cache[fh]:
return False
#if len(self.chunk_cache[fh][chunk_offset])>self.chunk_size:
# data = self.chunk_cache[fh][0:self.chunk_size]
#else:
data = "".join( self.chunk_cache[fh][chunk_offset] )
#print "data:", data
#print "cache:", self.chunk_cache[path]
#print "Flush Low: fh:%d path:%s data:%d chunk_cache:%d chunk_size:%d" % (fh, path, len(data), len(self.chunk_cache[fh]), self.chunk_size)
if len(data)>0:
num_append_chunks = self.num_chunks(len(data))
data_md5 = hashlib.md5(data).hexdigest()
#print "Flush Low: chunks:%d" % (num_append_chunks)
if not self.exists(path):
attributes = {"type":"f", "atime":int(time.time()), "ctime":int(time.time()), "mtime":int(time.time()), "size":0, "links":1, "attrs":""}
chunkuuids = self.master.alloc(path, num_append_chunks, attributes, data_md5)
else:
chunkuuids = self.master.alloc_append(path, num_append_chunks, data_md5)
#print "Flush Low: append_chunkuuids:%d" % (len(data))
if self.write_chunks(chunkuuids, data):
#print "Set size %s: %d" % (path, len(data))
self.master.file_set_attr(path, 'size', int(len(data)), 'add')
del self.chunk_cache[fh][chunk_offset]
#if fh in self.chunk_cache:
# self.chunk_cache[fh] = self.chunk_cache[fh][self.chunk_size:]
#else:
# return 0
return True
"""
def eafs_flush(self, path, fh):
print "** FUSE called flush( %s ) **" % path
self.flush_low( path, fh )
if fh in self.chunk_cache:
del self.chunk_cache[fh]
return True
def accumulate(self, path, data, fh):
self.accumulate_append( path, data, 0, fh )
"""
chunk_offset = 0
if fh not in self.chunk_cache:
self.chunk_cache[fh] = {}
self.chunk_cache[fh][chunk_offset] = ""
self.chunk_cache[fh][chunk_offset] += data
if len(self.chunk_cache[fh][chunk_offset])>=self.chunk_size:
self.flush_low( path, fh )
return len(data)
"""
def alloc_chunk( self, fh, path, data, attributes, chunkserver_uuids ):
num_chunks = self.num_chunks(len(data))
print "[accumulate_append] Alloc: %s num_chunks:%d size:%d" % (path, num_chunks, len(data))
chunkuuids = self.master.alloc(path, num_chunks, attributes)
print "[accumulate_append] Alloc Done"
for chunkuuid in chunkuuids:
self.chunk_cache[fh][chunkuuid] = None
chunkserver_uuids[chunkuuid] = []
for chunkserver_uuid in self.chunkservers:
chunkserver_uuids[chunkuuid].append( chunkserver_uuid )
return (chunkuuids, chunkserver_uuids)
def accumulate_append(self, path, data, offset, fh):
size = len(data)
chunk_data_offset = offset
chunkuuids = None
if self.exists( path ):
#print "[accumulate_append] Get chunks/offset: path:%s size:%d offset:%d" % (path, size, offset)
(chunkuuids, chunk_data_offset, chunkserver_uuids, chunkmd5s, next_chunkuuid) = self.master.get_chunkuuids_offset(path,size,offset)
attributes = 0
else:
#print "[accumulate_append] Set attributes for path:%s" % path
attributes = {"type":"f", "atime":int(time.time()), "ctime":int(time.time()), "mtime":int(time.time()), "size":0, "links":1, "attrs":""}
if fh not in self.chunk_cache:
self.chunk_cache[fh] = {}
offset_end = chunk_data_offset+size
if chunkuuids is None or chunkuuids==[]:
(chunkuuids, chunkserver_uuids) = self.alloc_chunk( fh, path, data, attributes, chunkserver_uuids )
print "[accumulate_append] chunkuuids: ", chunkuuids
for chunkuuid in chunkuuids:
print "[accumulate_append] rewrite chunk %s" % (chunkuuid)
if chunkuuid not in self.chunk_cache[fh]:
chunk = self.get_chunk( chunkuuid, chunkserver_uuids )
#print "[accumulate_append] chunk (GET): ", chunk
else:
chunk = self.chunk_cache[fh][chunkuuid]
#print "[accumulate_append] chunk (CACHE): ", chunk
initial_size = 0
if chunk is not None:
initial_size = len(chunk)
initial_md5 = ''
if chunk is not None:
initial_md5 = hashlib.md5(chunk).hexdigest()
# Start
a = ""
if chunk_data_offset>0 and chunk is not None:
a = chunk[0:chunk_data_offset]
#print "[accumulate_append] a: 0:%d len:%d" % (offset, len(a))
# Middle (data)
#print "[accumulate_append] offset:%d chunk_data_offset:%d offset_end:%d self.chunk_size:%d -- size:%d" % (offset, chunk_data_offset, offset_end, self.chunk_size, len(data))
new_offset = size
new_data = ""
if offset_end>self.chunk_size:
new_offset = size - (offset_end - self.chunk_size)
print " new offset:", new_offset
new_data = data[new_offset:]
#offset_end = self.chunk_size
print " Alloc new chunkuuids:", len(new_data)
(new_chunkuuids, chunkserver_uuids) = self.alloc_chunk( fh, path, new_data, attributes, chunkserver_uuids )
for new_chunkuuid in new_chunkuuids:
print " Append chunkuuid:", new_chunkuuid
chunkuuids.append( new_chunkuuid )
# End
c = ""
if offset_end<self.chunk_size and chunk is not None:
c = chunk[offset_end+1:self.chunk_size]
#print "[accumulate_append] c: %d:%d len:%d" % (offset_end, self.chunk_size, len(c))
print " [accumulate_append] before // a:%d data:%d c:%d" % ( len(a), len(data[0:new_offset]), len(c))
self.chunk_cache[fh][chunkuuid] = a + data[0:new_offset] + c
#print "a / data / c", a, data, c
print " [accumulate_append] offset:%d chunk_data_offset:%d offset_end:%d new_offset:%d -- size:%d chunk_size:%d a:%d c:%d" % (offset, chunk_data_offset, offset_end, new_offset, len(data), len(self.chunk_cache[fh][chunkuuid]), len(a), len(c))
#new_size = len( self.chunk_cache[fh][chunkuuid] )
#print "new_size:%d initial_size:%d" % (new_size, initial_size)
#if new_size>initial_size:
# self.master.file_set_attr(path, 'size', new_size-initial_size, 'add')
chunk_data_offset = 0
data = new_data
offset_end = chunk_data_offset+len(data)
#new_md5 = hashlib.md5(self.chunk_cache[fh][chunkuuid]).hexdigest()
#if initial_md5<>new_md5:
self.flush_low( path, fh, chunkuuid )
#print "[accumulate_append] all done"
return size
"""
if chunk_offset not in self.chunk_cache[fh]:
current_data = [] #"" for i in range(0,self.chunk_size)]
self.chunk_cache[fh][chunk_offset] = current_data
if self.exists( path ):
read_data = self.eafs_read( path, size, offset )
if read_data is not None:
current_data = [i for i in read_data]
for d in current_data:
self.chunk_cache[fh][chunk_offset].append( d )
print "[accumulate_append] Load chunk data: path:%s size:%d offset:%d currentdata:%d alldata:%d" % (path, size, offset, len(current_data), len(self.chunk_cache[fh][chunk_offset]))
print "[accumulate_append] chunk_offset: %d" % chunk_data_offset
offset_local = chunk_data_offset;
for d in data:
#print "[accumulate_append] set data: %d / %d / %d" % (fh, chunk_offset, offset_local)
if len(self.chunk_cache[fh][chunk_offset])>offset_local:
self.chunk_cache[fh][chunk_offset][offset_local] = d
else:
self.chunk_cache[fh][chunk_offset].append( d )
if len(self.chunk_cache[fh][chunk_offset])>=self.chunk_size:
print "[accumulate_append] flush: %d / %d / %d" % (chunk_offset, len(self.chunk_cache[fh][chunk_offset]), self.chunk_size)
self.flush_low( path, fh, chunk_offset )
break;
#return len(data)+self.accumulate_append(path, data, offset+1, fh))
else:
offset_local += 1
return len(data)
"""
def eafs_write(self, path, data, fh): #, attributes
#if self.exists(path):
# self.master.delete(path)
#num_chunks = self.num_chunks(len(data))
#chunkuuids = self.master.alloc(path, num_chunks, attributes)
#print "eafs_write: fh:%d path:%s data:%d" % (fh, path, len(data))
self.accumulate_append( path, data, 0, fh )
#self.write_chunks(chunkuuids, data)
return len(data)
def eafs_write_append(self, path, data, offset, fh):
#if not self.exists(path):
# raise Exception("append error, file does not exist: " + path)
#num_append_chunks = self.num_chunks(len(data))
#print "[eafs_write_append] DATA SIZE, NUM CHUNKS:", len(data), num_append_chunks
#start = time.time()
#append_chunkuuids = self.master.alloc_append(path, num_append_chunks)
#if self.debug>0: print "[eafs_write_append] master.alloc_append: ", (time.time()-start)
#self.write_chunks(append_chunkuuids, data)
#print "[eafs_write_append] fh:%d path:%s data:%d offset:%d" % (fh, path, len(data), offset)
return self.accumulate_append( path, data, offset, fh )
def eafs_read(self, path, size, offset):
self.update_chunkservers()
if not self.exists(path):
raise Exception("read error, file does not exist: " + path)
#if self.debug>1: print "eafs_read path: [%s] size:%d offset:%d" % (path, size, offset)
#print "eafs_read: ", path, size, offset
(chunkuuids, offset, chunkserver_uuids, chunkmd5s, next_chunkuuid) = self.master.get_chunkuuids_offset(path,size,offset)
#print "eafs_read chunkserver_uuids: ", chunkserver_uuids
#if self.debug>2:
#print "eafs_read chunkuuids: ", chunkuuids
chunks = []
for chunkuuid in chunkuuids:
#if self.debug>3:
#print "eafs_read chunkuuid: ", chunkuuid
if chunkuuid in self.chunk_cache_read or chunkuuid in self.chunk_cache_read_wait:
if chunkuuid in self.chunk_cache_read_wait:
while self.chunk_cache_read_wait[chunkuuid]:
time.sleep(1.0/1000.0)
chunk = self.chunk_cache_read[chunkuuid]
chunk_md5 = hashlib.md5(chunk).hexdigest()
if chunkmd5s[chunkuuid]<>chunk_md5:
print "eafs_read MD5 ERROR chunkuuid:%s chunk:%d master_md5:%s chunk_md5:%s" % (chunkuuid, len(chunk), chunkmd5s[chunkuuid], chunk_md5)
chunk = self.get_chunk( chunkuuid, chunkserver_uuids )
#print "eafs_read chunkuuid:%s chunk:%d master_md5:%s chunk_md5:%s" % (chunkuuid, len(chunk), chunkmd5s[chunkuuid], chunk_md5)
else:
chunk = self.get_chunk( chunkuuid, chunkserver_uuids )
if chunk is None:
raise Exception("read error, chunkserver unavailable: " + path)
chunks.append(chunk)
if len(chunks)==0:
return None
data = reduce(lambda x, y: x + y, chunks) # reassemble in order
data = data[offset:offset+size]
# Threading works but only for relatively slow media like video,
# for copy it is not that good
if next_chunkuuid is not None and next_chunkuuid not in self.chunk_cache_read and next_chunkuuid not in self.chunk_cache_read_wait:
self.chunk_cache_read_wait[next_chunkuuid] = True
get_chunk_thread = threading.Thread(None, self.get_chunk_thread, args=(next_chunkuuid, ))
get_chunk_thread.daemon = True
get_chunk_thread.start()
#print "eafs_read size:%d offset:%d data:%d chunk:%d " % (size, offset, len(data), len(chunk))
return data
def get_chunk(self, chunkuuid, chunkserver_uuids):
chunklocs = chunkserver_uuids[chunkuuid]
print "[get_chunk] chunkuuid:%s chunklocs:%s" % (chunkuuid, "".join(chunklocs))
done_chunkserver = []
chunk = None
#chunk_read = False
self.update_chunkservers()
while not ((chunk is not None) or (len(done_chunkserver)==len(chunklocs))):
chunkidrnd = random.randint(0, len(chunklocs)-1)
#print "Random: ", chunkidrnd, done_chunkserver, chunklocs
if len(done_chunkserver)>0:
while chunkidrnd in done_chunkserver:
chunkidrnd = random.randint(0, len(chunklocs)-1)
#print "Random2: ", chunkidrnd, done_chunkserver, chunklocs
chunkloc = chunklocs[chunkidrnd]
done_chunkserver.append(chunkidrnd)
#if self.debug>2:
#print "Select chunkloc %d::%s from %d choices" % (chunkidrnd, chunkloc, len(chunklocs))
#try:
if True:
# Read from chunkserver
#print "reading...",
chunk_raw = self.chunkservers[chunkloc].rpc.read(chunkuuid)
#print "done"
chunk = chunk_raw.data #zlib.decompress(chunk_raw.data)
#print "Read: ", chunkuuid, len(chunk)
# Add to read cache
self.chunk_cache_read[chunkuuid] = chunk
#chunk_read = True
#except:
else:
print "Chunkserver %s:%d failed %d remaining" % (chunkloc, chunkidrnd, len(chunklocs)-len(done_chunkserver))
#try:
# del self.chunkservers[chunkloc]
#except:
# pass
return chunk
def get_chunk_thread(self, chunkuuid):
#print "get_chunk_thread: %s" % chunkuuid
chunkserver_uuids = {chunkuuid: self.master.get_chunklocs(chunkuuid)}
self.get_chunk( chunkuuid, chunkserver_uuids )
self.chunk_cache_read_wait[chunkuuid] = False