def loadDb(self,
store: ApplicationStore = None,
checkInitialised: bool = False):
"""Load the PreloadLogger database.
Go through the directory and create all the relevant app instances and
events. Can be made to insert all found apps into an ApplicationStore,
or to exit if some Application instances are not properly initialised.
"""
count = 0 # Counter of fetched files, for stats
actors = set() # Apps that logged anything at all
empties = 0 # Matching files without content (logger crash)
invalids = 0 # Files with corrupted content (logger crash)
nosyscalls = [] # Logs with zero syscalls logged (not a bug)
nosyscallactors = set() # Apps that logged zero syscalls
instanceCount = 0 # Count of distinct app instances in the dataset
hasErrors = False # Whether some uninitialised apps were found
invalidApps = set() # List of desktop IDs that could not be init'd
eventCount = 0
# List all log files that match the PreloadLogger syntax
for file in os.listdir(self.path):
# Ignore files that don't match
if not PreloadLoggerLoader.pattern.match(file):
continue
count += 1
# Process log files that match the PreloadLogger name pattern
try:
f = open(self.path + "/" + file, 'rb')
except (IOError) as e:
print("Error: could not open file %s: %s" % (file, str(e)),
file=sys.stderr)
else:
with f:
if os.fstat(f.fileno()).st_size == 0:
print("Info: file '%s' is empty. Skipping." % file)
continue
# Parse the first line to get the identity of the app,
# but sometimes the header ends up on the second line
# in some logs... So, parse until we find a match, and
# remember the line index of the header
idx = 0
headerLocation = 0
result = None
for binary in f:
try:
line = binary.decode('utf-8')
except (UnicodeDecodeError) as e:
print("Error: %s has a non utf-8 line: %s " %
(file, str(e)),
file=sys.stderr)
idx += 1
continue
result = PreloadLoggerLoader.header.match(line)
if result:
headerLocation = idx
break
idx += 1
# Files with a missing or corrupted header are invalid
if result is None:
print("%s is missing a header" % file, file=sys.stderr)
invalids += 1
continue
# Parse the header line, make sure it has the right length.
g = result.groups()
if (len(g) != 3):
print("%s has wrong group count: " % file,
result.group(),
file=sys.stderr)
invalids += 1
continue
# Filter interpreters, and rewrite them to get the identity
# of the app they launched instead.
items = space.split(g[2])
interpreterid = None
# Python
if (pyre.match(g[0])):
interpreterid = g[0]
g = self.parsePython(g, items)
# print("PYTHON APP: %s" % g[2])
# Bash
if (bashre.match(g[0])):
interpreterid = g[0]
g = self.parseBash(g, items)
# print("BASH APP: %s" % g[2])
# Java
if (javare.match(g[0])):
interpreterid = g[0]
g = self.parseJava(g, items)
# print("JAVA APP: %s" % g[2])
# Perl
if (perlre.match(g[0])):
interpreterid = g[0]
g = self.parsePerl(g, items)
# print("PERL APP: %s" % g[2])
# Mono
if (monore.match(g[0])):
interpreterid = g[0]
g = self.parseMono(g, items)
# print("MONO APP: %s" % g[2])
# PHP
if (phpre.match(g[0])):
interpreterid = g[0]
g = self.parsePHP(g, items)
# print("PHP APP: %s" % g[2])
# Get first and last event to calculate the timestamps.
tstart = float("inf")
tend = 0
skipCache = None
lineIdx = 0
f.seek(0, 0)
for binary in f:
# Ignore the header.
if lineIdx == headerLocation:
lineIdx += 1
skipCache = None
continue
# Decode line.
try:
line = binary.decode('utf-8')
except (UnicodeDecodeError) as e:
print("Error: %s has a non utf-8 line: %s " %
(file, str(e)),
file=sys.stderr)
lineIdx += 1
skipCache = None
continue
# Previous line did not end and was skipped, merge it.
if skipCache:
line = skipCache + line
skipCache = None
# Line continues...
if line.endswith('\\\n'):
skipCache = line
lineIdx += 1
continue
line = line.rstrip("\n").lstrip(" ")
# Line is a parameter to the last system call logged
if line.startswith(' '):
lineIdx += 1
continue
# Check that line is a syntactically valid system call
result = PreloadLoggerLoader.syscall.match(line)
if result is None:
if debugEnabled():
print("%s has a corrupted line (match): %s" %
(file, line),
file=sys.stderr)
lineIdx += 1
continue
# Update the timestamp (convert to ZG millisec format)
h = result.groups()
tstart = int(h[0]) * 1000
break
# TODO, first non-header line + tail code.
lastLine = tail(f)
result = None
if lastLine:
result = PreloadLoggerLoader.syscall.match(lastLine)
if result is None:
if debugEnabled():
print("%s's last line is corrupted: %s" %
(file, lastLine),
file=sys.stderr)
else:
# Update the timestamp (convert to ZG millisec format)
h = result.groups()
tend = int(h[0]) * 1000
# Check if the timestamps have been set
if tend == 0:
nosyscalls.append(g)
nosyscallactors.add(g[0])
continue
# Sometimes, short logs have event ordering problems... We
# can try to ignore these problems as all events are indi-
# vidually timestamped anyway.
if tstart > tend:
tend, start = tstart, tend
# TODO: process deletions and remove corresponding files
# Make the application
try:
app = Application(desktopid=g[0],
pid=int(g[1]),
tstart=tstart,
tend=tend,
interpreterid=interpreterid)
app.setCommandLine(g[2])
except (ValueError) as e:
print("MISSING: %s" % g[0], file=sys.stderr)
hasErrors = True
invalidApps.add(g[0])
continue
# Ignore study artefacts!
if app.isStudyApp():
continue
# Add command-line event
event = Event(actor=app, time=tstart, cmdlineStr=g[2])
app.addEvent(event)
# Add system call events
skipCache = None
lineIdx = 0
currentCall = None
prevTimestamp = 0
timeDelta = 0
f.seek(0, 0)
for binary in f:
# Ignore the header.
if lineIdx == headerLocation:
lineIdx += 1
skipCache = None
continue
# Decode line.
try:
line = binary.decode('utf-8')
except (UnicodeDecodeError) as e:
print("Error: %s has a non utf-8 line: %s " %
(file, str(e)),
file=sys.stderr)
lineIdx += 1
skipCache = None
continue
# Previous line did not end and was skipped, merge it.
if skipCache:
line = skipCache + line
skipCache = None
# Line continues...
if line.endswith('\\\n'):
skipCache = line
lineIdx += 1
continue
line = line[:-1] # Remove ending "\n"
# Line is a parameter to the last system call logged
if line.startswith(' '):
if currentCall:
currentCall = (currentCall[0],
currentCall[1] + '\n' + line)
elif debugEnabled():
print("%s has a corrupted line (no call): %s" %
(file, line),
file=sys.stderr)
lineIdx += 1
continue
# Check that line is a syntactically valid system call
result = PreloadLoggerLoader.syscall.match(line)
if result is None:
if debugEnabled():
print("%s has a corrupted line (match): %s" %
(file, line),
file=sys.stderr)
lineIdx += 1
continue
# Update the timestamp (convert to ZG millisec format)
h = result.groups()
timestamp = int(h[0]) * 1000
# Append the system call to our syscall list. Note that
# we do something odd with the timestamp: because PL
# only logs at second precision, a lot of system calls
# have the same timestamp, which causes the EventStore
# to sort them in the wrong order. So, every time we
# have a timestamp identical to the previous one, we
# increase a counter that sorts them. This works under
# the assumption that there are at most 1000 events per
# second.
if timestamp == prevTimestamp:
timeDelta += 1
else:
timeDelta = 0
# Process the last system call into an Event, and clear
# up the syscalls list to keep RAM free!
if currentCall:
event = Event(actor=app,
time=currentCall[0],
syscallStr=currentCall[1])
app.addEvent(event)
eventCount += 1
# Create the new syscalls list.
currentCall = (timestamp + timeDelta, h[1])
prevTimestamp = timestamp
lineIdx += 1
# Add the found process id to our list of actors, using the
# app identity that was resolved by the Application ctor
actors.add(app.desktopid)
if checkInitialised and not app.isInitialised():
print("MISSING: %s" % g[0], file=sys.stderr)
hasErrors = True
# Insert into the ApplicationStore if one is available
if store is not None:
store.insert(app)
instanceCount += 1
if checkInitialised and hasErrors:
if invalidApps:
print("Invalid apps:", file=sys.stderr)
for a in sorted(invalidApps):
print("\t%s" % a, file=sys.stderr)
sys.exit(-1)
# print("Apps that logged valid files:")
# for act in sorted(actors):
# print(act)
# print("\nApps that logged files without a single system call:")
# for act in sorted(nosyscallactors):
# print(act)
self.appCount = len(actors)
self.instCount = count - empties - invalids - len(nosyscalls)
self.eventCount = eventCount
self.validEventRatio = 100 - 100 * (invalids + empties +
len(nosyscalls)) / (count)
print("Finished loading DB.\n%d files seen, %d valid from %d apps, "
"%d empty files, "
"%d logs with 0 syscalls from %d apps, "
"%d invalid.\nIn "
"total, %.02f%% files processed." %
(count, self.instCount, self.appCount, empties, len(nosyscalls),
len(nosyscallactors), invalids, self.validEventRatio))
print("Instance count: %d" % instanceCount)
