Fail to write a new activity

[MaximeAgez]

Affected Brightway Package

bw2data

What's broken or not working as expected?

Created a new activity in the Mobility example database. Checked that the activity is valid. Tried to .save() it and it fails.

Here is the code I used to create the activity:

import uuid
new_act = bw2data.Database('Mobility example').new_activity(uuid.uuid4().hex)
new_act['name'] = 'market for transmission network, electricity, medium voltage'
new_act['unit'] = 'kilometer'
new_act['location'] = 'US'
new_act['reference product'] = 'transmission from plant to grid'
new_act['type'] = 'process'
new_act.save()

What's the error message?

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
Cell In[60], line 1
----> 1 new_act.save()

File /lib/python3.11/site-packages/bw2data/backends/proxies.py:283, in Activity.save(self)
    280     geomapping.add([self["location"]])
    282 if databases[self["database"]].get("searchable", True):
--> 283     IndexManager(Database(self["database"]).filename).update_dataset(self._data)

File /lib/python3.11/site-packages/bw2data/search/indices.py:61, in IndexManager.update_dataset(self, ds)
     60 def update_dataset(self, ds):
---> 61     writer = self.get().writer()
     62     writer.update_document(**self._format_dataset(ds))
     63     writer.commit()

File /lib/python3.11/site-packages/whoosh/index.py:464, in FileIndex.writer(self, procs, **kwargs)
    462 else:
    463     from whoosh.writing import SegmentWriter
--> 464     return SegmentWriter(self, **kwargs)

File /lib/python3.11/site-packages/whoosh/writing.py:513, in SegmentWriter.__init__(self, ix, poolclass, timeout, delay, _lk, limitmb, docbase, codec, compound, **kwargs)
    511 if _lk:
    512     self.writelock = ix.lock("WRITELOCK")
--> 513     if not try_for(self.writelock.acquire, timeout=timeout,
    514                    delay=delay):
    515         raise LockError
    517 if codec is None:

File /lib/python3.11/site-packages/whoosh/util/filelock.py:54, in try_for(fn, timeout, delay)
     43 """Calls ``fn`` every ``delay`` seconds until it returns True or
     44 ``timeout`` seconds elapse. Returns True if the lock was acquired, or False
     45 if the timeout was reached.
   (...)
     50     the timeout period. Only used when blocking is False and timeout > 0.
     51 """
     53 until = time.time() + timeout
---> 54 v = fn()
     55 while not v and time.time() < until:
     56     time.sleep(delay)

File /lib/python3.11/site-packages/whoosh/util/filelock.py:100, in FcntlLock.acquire(self, blocking)
     97 flags = os.O_CREAT | os.O_WRONLY
     98 self.fd = os.open(self.filename, flags)
--> 100 mode = fcntl.LOCK_EX
    101 if not blocking:
    102     mode |= fcntl.LOCK_NB

AttributeError: module 'fcntl' has no attribute 'LOCK_EX'

In order to avoid multiple reports of the same issue, please confirm, that...

• I searched for similar reported limitations and didn't find any.

[michaelweinold]

Thank you for reporting! This is related to:

• File Lock in Pyodide/WASM pyodide/pyodide#4150 (comment)
• Limitations: Missing pyfilesystem2 Support